From 80599013f2cbfb26642421077574876928427ed0 Mon Sep 17 00:00:00 2001
From: huangyuhui <huanghongxun2008@126.com>
Date: Sun, 12 Feb 2017 22:56:44 +0800
Subject: [PATCH] Fixed not showing prompt when no version here

---
 HMCL/build.gradle                             |   4 +-
 .../launcher/api/AddTabCallback.java          |  28 +++
 .../hellominecraft/launcher/api/IPlugin.java  |  32 +--
 .../launcher/api/PluginManager.java           |  20 +-
 .../config/AuthenticatorChangedEvent.java     |  35 ++++
 .../config/DownloadTypeChangedEvent.java      |  35 ++++
 .../api/event/config/ProfileChangedEvent.java |  33 ++++
 .../api/event/config/ProfileLoadingEvent.java |  32 +++
 .../api/event/config/ThemeChangedEvent.java   |  35 ++++
 .../launch/DecompressLibrariesEvent.java      |  39 ++++
 .../event/launch}/DecompressLibraryJob.java   |  10 +-
 .../event/launch/DownloadLibrariesEvent.java  |  39 ++++
 .../event/launch}/DownloadLibraryJob.java     |   2 +-
 .../api/event/launch/LaunchEvent.java         |  37 ++++
 .../event/launch/LaunchSucceededEvent.java    |  37 ++++
 .../event}/launch/LaunchingState.java         |   6 +-
 .../launch/LaunchingStateChangedEvent.java    |  36 ++++
 .../launch/ProcessingLaunchOptionsEvent.java  |  40 ++++
 .../launch/ProcessingLoginResultEvent.java    |  40 ++++
 .../event/version/LoadedOneVersionEvent.java  |  36 ++++
 .../event/version/RefreshedVersionsEvent.java |  37 ++++
 .../version/RefreshingVersionsEvent.java      |  37 ++++
 .../launcher/core/GameException.java          |   2 +-
 .../launcher/core/RuntimeGameException.java   |  40 ++++
 .../core/auth/AuthenticationException.java    |   5 +
 .../launcher/core/auth/IAuthenticator.java    |   2 +-
 .../core/auth/yggdrasil/UserType.java         |  55 ++++++
 .../core/auth/yggdrasil/ValidateRequest.java  |  33 ++++
 .../launcher/core/download/DownloadType.java  |   5 +
 .../download/MinecraftDownloadService.java    |   1 +
 .../core/launch/DefaultGameLauncher.java      |  40 ++--
 .../launcher/core/launch/GameLauncher.java    |  51 +++--
 .../core/launch/LibraryDownloadTask.java      |   2 +-
 .../service/IMinecraftDownloadService.java    |   2 +-
 .../core/service/IMinecraftProvider.java      |   8 +-
 .../core/version/MinecraftVersionManager.java |  11 +-
 .../hellominecraft/launcher/Main.java         |  16 +-
 .../launcher/setting/Config.java              |  15 +-
 .../launcher/setting/Profile.java             |  42 ++--
 .../launcher/setting/Settings.java            |  12 +-
 .../launcher/setting/VersionSetting.java      |  56 ++++--
 .../launcher/ui/GameDownloadPanel.java        |   1 +
 .../launcher/ui/GameSettingsPanel.form        |   2 +-
 .../launcher/ui/GameSettingsPanel.java        |  49 +++--
 .../launcher/ui/InstallerPanel.java           |   1 +
 .../launcher/ui/LauncherSettingsPanel.java    |   2 +
 .../launcher/ui/LaunchingUIDaemon.java        | 184 ++++++++++--------
 .../hellominecraft/launcher/ui/MainFrame.java |  19 +-
 .../launcher/ui/MainPagePanel.java            |  73 ++++---
 .../launcher/ui/NewTabPane.java               |   1 +
 .../launcher/ui/RepaintPage.java              |   1 +
 .../launcher/util/DefaultPlugin.java          |  32 +--
 .../launcher/util/HMCLGameLauncher.java       |  29 ++-
 .../launcher/util/HMCLMinecraftService.java   |  15 +-
 .../util/upgrade/AppDataUpgrader.java         |  13 +-
 .../launcher/util/upgrade/IUpgrader.java      |   7 +-
 .../util/upgrade/NewFileUpgrader.java         |   4 +-
 .../hellominecraft/svrmgr/server/Server.java  |   8 +-
 .../hellominecraft/svrmgr/ui/MainWindow.java  |   2 +-
 .../svrmgr/util/WaitForThread.java            |   6 +-
 .../hellominecraft/api/EventBus.java          |  48 +++++
 .../{util => api}/EventHandler.java           |  46 +++--
 .../{util/Event.java => api/HMCLAPI.java}     |  16 +-
 .../api/PropertyChangedEvent.java             |  49 +++++
 .../hellominecraft/api/ResultedEvent.java     |  44 +++++
 .../api/ResultedSimpleEvent.java              |  41 ++++
 .../hellominecraft/api/SimpleEvent.java       |  41 ++++
 .../api/event/OutOfDateEvent.java             |  40 ++++
 .../event/process/JVMLaunchFailedEvent.java   |  37 ++++
 .../JavaProcessExitedAbnormallyEvent.java     |  37 ++++
 .../process/JavaProcessStartingEvent.java     |  37 ++++
 .../process/JavaProcessStoppedEvent.java      |  37 ++++
 .../hellominecraft/util/UpdateChecker.java    |   9 +-
 .../hellominecraft/util/func/Consumer.java    |   4 +-
 .../hellominecraft/util/net/HTTPGetTask.java  |   7 +-
 .../util/sys/JavaProcessMonitor.java          |  50 ++---
 .../util/sys/ProcessThread.java               |  17 +-
 .../hellominecraft/util/task/TaskList.java    |   7 +-
 .../hellominecraft/util}/ui/Page.java         |   7 +-
 .../hellominecraft/util}/ui/Selectable.java   |   2 +-
 80 files changed, 1637 insertions(+), 436 deletions(-)
 create mode 100644 HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/AddTabCallback.java
 create mode 100644 HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/config/AuthenticatorChangedEvent.java
 create mode 100644 HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/config/DownloadTypeChangedEvent.java
 create mode 100644 HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/config/ProfileChangedEvent.java
 create mode 100644 HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/config/ProfileLoadingEvent.java
 create mode 100644 HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/config/ThemeChangedEvent.java
 create mode 100644 HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/DecompressLibrariesEvent.java
 rename HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/{core/version => api/event/launch}/DecompressLibraryJob.java (82%)
 create mode 100644 HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/DownloadLibrariesEvent.java
 rename HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/{core/download => api/event/launch}/DownloadLibraryJob.java (96%)
 create mode 100644 HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/LaunchEvent.java
 create mode 100644 HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/LaunchSucceededEvent.java
 rename HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/{core => api/event}/launch/LaunchingState.java (88%)
 create mode 100644 HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/LaunchingStateChangedEvent.java
 create mode 100644 HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/ProcessingLaunchOptionsEvent.java
 create mode 100644 HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/ProcessingLoginResultEvent.java
 create mode 100644 HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/version/LoadedOneVersionEvent.java
 create mode 100644 HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/version/RefreshedVersionsEvent.java
 create mode 100644 HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/version/RefreshingVersionsEvent.java
 create mode 100644 HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/RuntimeGameException.java
 create mode 100644 HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/auth/yggdrasil/UserType.java
 create mode 100644 HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/auth/yggdrasil/ValidateRequest.java
 create mode 100644 HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/EventBus.java
 rename HMCUtils/src/main/java/org/jackhuang/hellominecraft/{util => api}/EventHandler.java (58%)
 rename HMCUtils/src/main/java/org/jackhuang/hellominecraft/{util/Event.java => api/HMCLAPI.java} (77%)
 mode change 100755 => 100644
 create mode 100644 HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/PropertyChangedEvent.java
 create mode 100644 HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/ResultedEvent.java
 create mode 100644 HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/ResultedSimpleEvent.java
 create mode 100644 HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/SimpleEvent.java
 create mode 100644 HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/event/OutOfDateEvent.java
 create mode 100644 HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/event/process/JVMLaunchFailedEvent.java
 create mode 100644 HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/event/process/JavaProcessExitedAbnormallyEvent.java
 create mode 100644 HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/event/process/JavaProcessStartingEvent.java
 create mode 100644 HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/event/process/JavaProcessStoppedEvent.java
 rename {HMCL/src/main/java/org/jackhuang/hellominecraft/launcher => HMCUtils/src/main/java/org/jackhuang/hellominecraft/util}/ui/Page.java (93%)
 rename {HMCL/src/main/java/org/jackhuang/hellominecraft/launcher => HMCUtils/src/main/java/org/jackhuang/hellominecraft/util}/ui/Selectable.java (94%)

diff --git a/HMCL/build.gradle b/HMCL/build.gradle
index a5d0f74bc..27f348f6c 100755
--- a/HMCL/build.gradle
+++ b/HMCL/build.gradle
@@ -33,11 +33,11 @@ def buildnumber = System.getenv("TRAVIS_BUILD_NUMBER")
 if (buildnumber == null)
     buildnumber = System.getenv("BUILD_NUMBER")
 if (buildnumber == null)
-    buildnumber = "5"
+    buildnumber = "0"
     
 def versionroot = System.getenv("VERSION_ROOT")
 if (versionroot == null)
-    versionroot = "2.6.0"
+    versionroot = "2.6.1"
 
 String mavenGroupId = 'HMCL'
 String mavenVersion = versionroot + '.' + buildnumber
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/AddTabCallback.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/AddTabCallback.java
new file mode 100644
index 000000000..231b012d7
--- /dev/null
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/AddTabCallback.java
@@ -0,0 +1,28 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.launcher.api;
+
+import org.jackhuang.hellominecraft.util.ui.Page;
+
+/**
+ *
+ * @author huang
+ */
+public interface AddTabCallback {
+    void addTab(Page tabPage, String id, String title);
+}
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/IPlugin.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/IPlugin.java
index c14d18661..4b5b55332 100755
--- a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/IPlugin.java
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/IPlugin.java
@@ -17,12 +17,8 @@
  */
 package org.jackhuang.hellominecraft.launcher.api;
 
-import org.jackhuang.hellominecraft.launcher.core.GameException;
-import org.jackhuang.hellominecraft.launcher.core.service.IMinecraftService;
-import org.jackhuang.hellominecraft.launcher.core.auth.AuthenticationException;
+import javax.swing.JFrame;
 import org.jackhuang.hellominecraft.launcher.core.auth.IAuthenticator;
-import org.jackhuang.hellominecraft.launcher.core.auth.UserProfileProvider;
-import org.jackhuang.hellominecraft.launcher.core.launch.LaunchOptions;
 import org.jackhuang.hellominecraft.util.func.Consumer;
 
 /**
@@ -31,34 +27,12 @@ import org.jackhuang.hellominecraft.util.func.Consumer;
  */
 public interface IPlugin {
 
-    /**
-     * You can modify the application actions by this method.
-     *
-     * @param obj minecraft service wanted
-     *
-     * @return For example, you can implement IMinecraftProvider to support
-     *         MultiMC
-     */
-    IMinecraftService provideMinecraftService(Object obj);
-
     /**
      * Register authenticators by calling IAuthenticator.LOGINS.add.
      *
      * @param apply call apply.accept(your authenticator)
      */
     void onRegisterAuthenticators(Consumer<IAuthenticator> apply);
-
-    /**
-     * Open your customized UI.
-     */
-    void showUI();
-
-    /**
-     * Add your server ip or modify the access token.
-     *
-     * @param result What you want.
-     */
-    void onProcessingLoginResult(UserProfileProvider result) throws AuthenticationException;
-
-    void onProcessingLaunchOptions(LaunchOptions p) throws GameException;
+    
+    void onAddTab(JFrame frame, AddTabCallback callback);
 }
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/PluginManager.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/PluginManager.java
index bb33d229e..886d323f8 100755
--- a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/PluginManager.java
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/PluginManager.java
@@ -17,6 +17,10 @@
  */
 package org.jackhuang.hellominecraft.launcher.api;
 
+import java.util.ArrayList;
+import javax.swing.JFrame;
+import org.jackhuang.hellominecraft.launcher.core.auth.IAuthenticator;
+import org.jackhuang.hellominecraft.util.func.Consumer;
 import org.jackhuang.hellominecraft.util.log.HMCLog;
 
 /**
@@ -25,19 +29,25 @@ import org.jackhuang.hellominecraft.util.log.HMCLog;
  */
 public class PluginManager {
 
-    private static IPlugin NOW_PLUGIN;
+    private static final ArrayList<IPlugin> PLUGINS = new ArrayList<>();
 
     public static void getPlugin(Class<?> cls) {
         try {
             IPlugin p = (IPlugin) cls.newInstance();
-            NOW_PLUGIN = p;
+            PLUGINS.add(p);
         } catch (IllegalAccessException | InstantiationException e) {
             HMCLog.err("Failed to new instance");
         }
     }
-
-    public static IPlugin plugin() {
-        return NOW_PLUGIN;
+    
+    public static void fireRegisterAuthenticators(Consumer<IAuthenticator> callback) {
+        for (IPlugin p : PLUGINS)
+            p.onRegisterAuthenticators(callback);
+    }
+    
+    public static void fireAddTab(JFrame frame, AddTabCallback callback) {
+        for (IPlugin p : PLUGINS)
+            p.onAddTab(frame, callback);
     }
 
 }
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/config/AuthenticatorChangedEvent.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/config/AuthenticatorChangedEvent.java
new file mode 100644
index 000000000..ba7feada5
--- /dev/null
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/config/AuthenticatorChangedEvent.java
@@ -0,0 +1,35 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.launcher.api.event.config;
+
+import org.jackhuang.hellominecraft.api.SimpleEvent;
+import org.jackhuang.hellominecraft.launcher.core.auth.IAuthenticator;
+
+/**
+ * This event gets fired when the authenticator changed.
+ * 
+ * @param IAuthenticator the new authenticator.
+ * @author huangyuhui
+ */
+public class AuthenticatorChangedEvent extends SimpleEvent<IAuthenticator> {
+    
+    public AuthenticatorChangedEvent(Object source, IAuthenticator value) {
+        super(source, value);
+    }
+    
+}
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/config/DownloadTypeChangedEvent.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/config/DownloadTypeChangedEvent.java
new file mode 100644
index 000000000..20252021e
--- /dev/null
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/config/DownloadTypeChangedEvent.java
@@ -0,0 +1,35 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.launcher.api.event.config;
+
+import org.jackhuang.hellominecraft.api.SimpleEvent;
+import org.jackhuang.hellominecraft.launcher.core.download.DownloadType;
+
+/**
+ * This event gets fired when the download type changed.
+ * 
+ * @param DownloadType the new downlaod type;
+ * @author huangyuhui
+ */
+public class DownloadTypeChangedEvent extends SimpleEvent<DownloadType> {
+    
+    public DownloadTypeChangedEvent(Object source, DownloadType value) {
+        super(source, value);
+    }
+    
+}
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/config/ProfileChangedEvent.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/config/ProfileChangedEvent.java
new file mode 100644
index 000000000..5fe5451d8
--- /dev/null
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/config/ProfileChangedEvent.java
@@ -0,0 +1,33 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.launcher.api.event.config;
+
+import org.jackhuang.hellominecraft.api.SimpleEvent;
+
+/**
+ * This event gets fired when the selected profile changed.
+ * @param String the new profile id.
+ * @author huangyuhui
+ */
+public class ProfileChangedEvent extends SimpleEvent<String> {
+    
+    public ProfileChangedEvent(Object source, String value) {
+        super(source, value);
+    }
+    
+}
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/config/ProfileLoadingEvent.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/config/ProfileLoadingEvent.java
new file mode 100644
index 000000000..87a54a044
--- /dev/null
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/config/ProfileLoadingEvent.java
@@ -0,0 +1,32 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.launcher.api.event.config;
+
+import java.util.EventObject;
+
+/**
+ * This event gets fired when loading profiles.
+ * @author huang
+ */
+public class ProfileLoadingEvent extends EventObject {
+    
+    public ProfileLoadingEvent(Object source) {
+        super(source);
+    }
+    
+}
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/config/ThemeChangedEvent.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/config/ThemeChangedEvent.java
new file mode 100644
index 000000000..b1da66bda
--- /dev/null
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/config/ThemeChangedEvent.java
@@ -0,0 +1,35 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.launcher.api.event.config;
+
+import org.jackhuang.hellominecraft.api.SimpleEvent;
+import org.jackhuang.hellominecraft.lookandfeel.Theme;
+
+/**
+ * This event gets fired when the application theme changed.
+ * 
+ * @param Theme the changed theme
+ * @author huangyuhui
+ */
+public class ThemeChangedEvent extends SimpleEvent<Theme> {
+    
+    public ThemeChangedEvent(Object source, Theme value) {
+        super(source, value);
+    }
+    
+}
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/DecompressLibrariesEvent.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/DecompressLibrariesEvent.java
new file mode 100644
index 000000000..c0db77b36
--- /dev/null
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/DecompressLibrariesEvent.java
@@ -0,0 +1,39 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.launcher.api.event.launch;
+
+import org.jackhuang.hellominecraft.api.ResultedSimpleEvent;
+
+/**
+ * This event gets fired when we are launching a game and going to decompress natives.
+ * <br>
+ * This event is {@link org.jackhuang.hellominecraft.api.ResultedEvent}
+ * If this event is failed, the launching process will be terminated.
+ * <br>
+ * This event is fired on the {@link org.jackhuang.hellominecraft.api.HMCLAPI#EVENT_BUS}
+ * @param source {@link org.jackhuang.hellominecraft.launcher.core.launch.GameLauncher}
+ * @param DecompressLibraryJob libraries to be decompressed
+ * @author huangyuhui
+ */
+public class DecompressLibrariesEvent extends ResultedSimpleEvent<DecompressLibraryJob> {
+    
+    public DecompressLibrariesEvent(Object source, DecompressLibraryJob value) {
+        super(source, value);
+    }
+    
+}
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/version/DecompressLibraryJob.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/DecompressLibraryJob.java
similarity index 82%
rename from HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/version/DecompressLibraryJob.java
rename to HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/DecompressLibraryJob.java
index c531d82f7..46ec3e8b0 100644
--- a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/version/DecompressLibraryJob.java
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/DecompressLibraryJob.java
@@ -15,12 +15,12 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see {http://www.gnu.org/licenses/}.
  */
-package org.jackhuang.hellominecraft.launcher.core.version;
+package org.jackhuang.hellominecraft.launcher.api.event.launch;
 
 import java.io.File;
+import org.jackhuang.hellominecraft.launcher.core.version.Extract;
 
 /**
- *
  * @author huangyuhui
  */
 public class DecompressLibraryJob {
@@ -29,6 +29,12 @@ public class DecompressLibraryJob {
     public Extract[] extractRules;
     private File decompressTo;
 
+    /**
+     * The length of these 2 arrays must be the same.
+     * @param decompressFiles
+     * @param extractRules
+     * @param decompressTo folder
+     */
     public DecompressLibraryJob(File[] decompressFiles, Extract[] extractRules, File decompressTo) {
         this.decompressFiles = decompressFiles.clone();
         this.extractRules = extractRules.clone();
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/DownloadLibrariesEvent.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/DownloadLibrariesEvent.java
new file mode 100644
index 000000000..fceecea2b
--- /dev/null
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/DownloadLibrariesEvent.java
@@ -0,0 +1,39 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.launcher.api.event.launch;
+
+import java.util.List;
+import org.jackhuang.hellominecraft.api.ResultedSimpleEvent;
+
+/**
+ * This event gets fired when we are launching a game and there are some libraries to be downloaded.
+ * <br>
+ * This event is {@link org.jackhuang.hellominecraft.api.ResultedEvent}
+ * If this event is failed, the launching process will be terminated.
+ * <br>
+ * This event is fired on the {@link org.jackhuang.hellominecraft.api.HMCLAPI#EVENT_BUS}
+ * @param source {@link org.jackhuang.hellominecraft.launcher.core.launch.GameLauncher}
+ * Passed value List&lt;DownloadLibraryJob&gt;: libraries to be downloaded.
+ * @author huangyuhui
+ */
+public class DownloadLibrariesEvent extends ResultedSimpleEvent<List<DownloadLibraryJob>> {
+
+    public DownloadLibrariesEvent(Object sender, List<DownloadLibraryJob> lists) {
+        super(sender, lists);
+    }
+}
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/download/DownloadLibraryJob.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/DownloadLibraryJob.java
similarity index 96%
rename from HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/download/DownloadLibraryJob.java
rename to HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/DownloadLibraryJob.java
index b596c91d2..d1c6e2c5b 100644
--- a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/download/DownloadLibraryJob.java
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/DownloadLibraryJob.java
@@ -15,7 +15,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see {http://www.gnu.org/licenses/}.
  */
-package org.jackhuang.hellominecraft.launcher.core.download;
+package org.jackhuang.hellominecraft.launcher.api.event.launch;
 
 import java.io.File;
 import org.jackhuang.hellominecraft.launcher.core.version.IMinecraftLibrary;
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/LaunchEvent.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/LaunchEvent.java
new file mode 100644
index 000000000..0edc36c01
--- /dev/null
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/LaunchEvent.java
@@ -0,0 +1,37 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.launcher.api.event.launch;
+
+import org.jackhuang.hellominecraft.api.SimpleEvent;
+import org.jackhuang.hellominecraft.util.sys.JavaProcess;
+
+/**
+ * This event gets fired when we launched the game.
+ * <br>
+ * This event is fired on the {@link org.jackhuang.hellominecraft.api.HMCLAPI#EVENT_BUS}
+ * @param source {@link org.jackhuang.hellominecraft.launcher.core.launch.GameLauncher}
+ * @param JavaProcess the game process
+ * @author huangyuhui
+ */
+public class LaunchEvent extends SimpleEvent<JavaProcess> {
+    
+    public LaunchEvent(Object source, JavaProcess value) {
+        super(source, value);
+    }
+    
+}
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/LaunchSucceededEvent.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/LaunchSucceededEvent.java
new file mode 100644
index 000000000..ca82a7741
--- /dev/null
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/LaunchSucceededEvent.java
@@ -0,0 +1,37 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.launcher.api.event.launch;
+
+import java.util.List;
+import org.jackhuang.hellominecraft.api.SimpleEvent;
+
+/**
+ * This event gets fired when we make the launching command successfully(not launched the game process).
+ * <br>
+ * This event is fired on the {@link org.jackhuang.hellominecraft.api.HMCLAPI#EVENT_BUS}
+ * @param source {@link org.jackhuang.hellominecraft.launcher.core.launch.GameLauncher}
+ * @param List&lt;String&gt; Our launching command.
+ * @author huangyuhui
+ */
+public class LaunchSucceededEvent extends SimpleEvent<List<String>>{
+    
+    public LaunchSucceededEvent(Object source, List<String> value) {
+        super(source, value);
+    }
+    
+}
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/launch/LaunchingState.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/LaunchingState.java
similarity index 88%
rename from HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/launch/LaunchingState.java
rename to HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/LaunchingState.java
index 4418ef2ae..f6e50687c 100644
--- a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/launch/LaunchingState.java
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/LaunchingState.java
@@ -15,15 +15,17 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see {http://www.gnu.org/licenses/}.
  */
-package org.jackhuang.hellominecraft.launcher.core.launch;
+package org.jackhuang.hellominecraft.launcher.api.event.launch;
 
 /**
  *
  * @author huangyuhui
  */
 public enum LaunchingState {
+    Starting,
     LoggingIn,
     GeneratingLaunchingCodes,
     DownloadingLibraries,
-    DecompressingNatives
+    DecompressingNatives,
+    Done
 }
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/LaunchingStateChangedEvent.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/LaunchingStateChangedEvent.java
new file mode 100644
index 000000000..8cb350da3
--- /dev/null
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/LaunchingStateChangedEvent.java
@@ -0,0 +1,36 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.launcher.api.event.launch;
+
+import org.jackhuang.hellominecraft.api.SimpleEvent;
+
+/**
+ * This event gets fired when we are launching a game and mark what things we are doing.
+ * <br>
+ * This event is fired on the {@link org.jackhuang.hellominecraft.api.HMCLAPI#EVENT_BUS}
+ * @param source {@link org.jackhuang.hellominecraft.launcher.core.launch.GameLauncher}
+ * @param LaunchingState the launching state.
+ * @author huangyuhui
+ */
+public class LaunchingStateChangedEvent extends SimpleEvent<LaunchingState> {
+    
+    public LaunchingStateChangedEvent(Object source, LaunchingState value) {
+        super(source, value);
+    }
+    
+}
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/ProcessingLaunchOptionsEvent.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/ProcessingLaunchOptionsEvent.java
new file mode 100644
index 000000000..e7754f421
--- /dev/null
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/ProcessingLaunchOptionsEvent.java
@@ -0,0 +1,40 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.launcher.api.event.launch;
+
+import org.jackhuang.hellominecraft.api.SimpleEvent;
+import org.jackhuang.hellominecraft.launcher.core.launch.LaunchOptions;
+
+/**
+ * This event gets fired before generating launch command.
+ * <br>
+ * Pay attension: If you need to terminate the launching process, you must throw
+ * {@link org.jackhuang.hellominecraft.launcher.core.RuntimeGameException anyway.
+ * <br>
+ * This event is fired on the {@link org.jackhuang.hellominecraft.api.HMCLAPI#EVENT_BUS}
+ * @param source {@link org.jackhuang.hellominecraft.launcher.core.launch.GameLauncher}
+ * @param LaunchOptions you can modify the value of this event to control the launching process.
+ * @author huang
+ */
+public class ProcessingLaunchOptionsEvent extends SimpleEvent<LaunchOptions> {
+    
+    public ProcessingLaunchOptionsEvent(Object source, LaunchOptions value) {
+        super(source, value);
+    }
+    
+}
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/ProcessingLoginResultEvent.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/ProcessingLoginResultEvent.java
new file mode 100644
index 000000000..b46f90163
--- /dev/null
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/launch/ProcessingLoginResultEvent.java
@@ -0,0 +1,40 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.launcher.api.event.launch;
+
+import org.jackhuang.hellominecraft.api.SimpleEvent;
+import org.jackhuang.hellominecraft.launcher.core.auth.UserProfileProvider;
+
+/**
+ * This event gets fired when we successfully logged in.
+ * <br>
+ * Pay attension: If you need to terminate the launching process, you must throw
+ * {@link org.jackhuang.hellominecraft.launcher.core.RuntimeGameException anyway.
+ * <br>
+ * This event is fired on the {@link org.jackhuang.hellominecraft.api.HMCLAPI#EVENT_BUS}
+ * @param source {@link org.jackhuang.hellominecraft.launcher.core.launch.GameLauncher}
+ * @param UserProfileProvider you can modify the value of this event to control the user profile.
+ * @author huangyuhui
+ */
+public class ProcessingLoginResultEvent extends SimpleEvent<UserProfileProvider> {
+    
+    public ProcessingLoginResultEvent(Object source, UserProfileProvider value) {
+        super(source, value);
+    }
+    
+}
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/version/LoadedOneVersionEvent.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/version/LoadedOneVersionEvent.java
new file mode 100644
index 000000000..490e14553
--- /dev/null
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/version/LoadedOneVersionEvent.java
@@ -0,0 +1,36 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.launcher.api.event.version;
+
+import org.jackhuang.hellominecraft.api.SimpleEvent;
+
+/**
+ * This event gets fired when a minecraft version has been loaded.
+ * <br>
+ * This event is fired on the {@link org.jackhuang.hellominecraft.api.HMCLAPI#EVENT_BUS}
+ * @param source {@link org.jackhuang.hellominecraft.launcher.core.version.MinecraftVersionManager}
+ * @param String the version id.
+ * @author huang
+ */
+public class LoadedOneVersionEvent extends SimpleEvent<String> {
+    
+    public LoadedOneVersionEvent(Object source, String value) {
+        super(source, value);
+    }
+    
+}
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/version/RefreshedVersionsEvent.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/version/RefreshedVersionsEvent.java
new file mode 100644
index 000000000..8aced6d0f
--- /dev/null
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/version/RefreshedVersionsEvent.java
@@ -0,0 +1,37 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.launcher.api.event.version;
+
+import org.jackhuang.hellominecraft.api.SimpleEvent;
+import org.jackhuang.hellominecraft.launcher.core.service.IMinecraftService;
+
+/**
+ * This event gets fired when all the versions in .minecraft folder are loaded.
+ * <br>
+ * This event is fired on the {@link org.jackhuang.hellominecraft.api.HMCLAPI#EVENT_BUS}
+ * @param source {@link org.jackhuang.hellominecraft.launcher.core.version.MinecraftVersionManager}
+ * @param IMinecraftService the .minecraft folder.
+ * @author huangyuhui
+ */
+public class RefreshedVersionsEvent extends SimpleEvent<IMinecraftService> {
+    
+    public RefreshedVersionsEvent(Object source, IMinecraftService value) {
+        super(source, value);
+    }
+    
+}
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/version/RefreshingVersionsEvent.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/version/RefreshingVersionsEvent.java
new file mode 100644
index 000000000..cb96b0d62
--- /dev/null
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/api/event/version/RefreshingVersionsEvent.java
@@ -0,0 +1,37 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.launcher.api.event.version;
+
+import org.jackhuang.hellominecraft.api.SimpleEvent;
+import org.jackhuang.hellominecraft.launcher.core.service.IMinecraftService;
+
+/**
+ * This event gets fired when loading versions in a .minecraft folder.
+ * <br>
+ * This event is fired on the {@link org.jackhuang.hellominecraft.api.HMCLAPI#EVENT_BUS}
+ * @param source {@link org.jackhuang.hellominecraft.launcher.core.version.MinecraftVersionManager}
+ * @param IMinecraftService .minecraft folder.
+ * @author huang
+ */
+public class RefreshingVersionsEvent extends SimpleEvent<IMinecraftService> {
+    
+    public RefreshingVersionsEvent(Object source, IMinecraftService value) {
+        super(source, value);
+    }
+    
+}
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/GameException.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/GameException.java
index 7da953c9e..9c8e44a7c 100644
--- a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/GameException.java
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/GameException.java
@@ -18,7 +18,7 @@
 package org.jackhuang.hellominecraft.launcher.core;
 
 /**
- *
+ * Thrown if we have some problem generating launch command.
  * @author huangyuhui
  */
 public class GameException extends Exception {
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/RuntimeGameException.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/RuntimeGameException.java
new file mode 100644
index 000000000..eccd03646
--- /dev/null
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/RuntimeGameException.java
@@ -0,0 +1,40 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.launcher.core;
+
+/**
+ *
+ * @author huang
+ */
+public class RuntimeGameException extends RuntimeException {
+
+    public RuntimeGameException() {
+    }
+
+    public RuntimeGameException(String message) {
+        super(message);
+    }
+
+    public RuntimeGameException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public RuntimeGameException(Throwable cause) {
+        super(cause);
+    }
+}
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/auth/AuthenticationException.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/auth/AuthenticationException.java
index a8a0cfa9d..2a132a362 100755
--- a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/auth/AuthenticationException.java
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/auth/AuthenticationException.java
@@ -17,6 +17,11 @@
  */
 package org.jackhuang.hellominecraft.launcher.core.auth;
 
+/**
+ * Thrown if we are trying to log in but there's some problems like password wrong.
+ *
+ * @author huangyuhui
+ */
 public class AuthenticationException extends Exception {
 
     public AuthenticationException() {
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/auth/IAuthenticator.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/auth/IAuthenticator.java
index dcac75f9d..0845fb71d 100755
--- a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/auth/IAuthenticator.java
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/auth/IAuthenticator.java
@@ -33,7 +33,7 @@ public abstract class IAuthenticator {
     public static final List<IAuthenticator> LOGINS = new ArrayList<>();
 
     static {
-        PluginManager.plugin().onRegisterAuthenticators(LOGINS::add);
+        PluginManager.fireRegisterAuthenticators(LOGINS::add);
     }
 
     protected String clientToken, username, password;
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/auth/yggdrasil/UserType.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/auth/yggdrasil/UserType.java
new file mode 100644
index 000000000..ef54c8d35
--- /dev/null
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/auth/yggdrasil/UserType.java
@@ -0,0 +1,55 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.launcher.core.auth.yggdrasil;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ *
+ * @author huang
+ */
+public enum UserType {
+
+    LEGACY("legacy"), MOJANG("mojang");
+
+    private static final Map<String, UserType> BY_NAME;
+    private final String name;
+
+    private UserType(String name) {
+        this.name = name;
+    }
+
+    public static UserType byName(String name) {
+        return (UserType) BY_NAME.get(name.toLowerCase());
+    }
+    
+    public static UserType byLegacy(boolean isLegacy) {
+        return isLegacy ? LEGACY : MOJANG;
+    }
+
+    public String getName() {
+        return this.name;
+    }
+
+    static {
+        BY_NAME = new HashMap();
+        for (UserType type : values())
+            BY_NAME.put(type.name, type);
+    }
+}
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/auth/yggdrasil/ValidateRequest.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/auth/yggdrasil/ValidateRequest.java
new file mode 100644
index 000000000..4fcb1c467
--- /dev/null
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/auth/yggdrasil/ValidateRequest.java
@@ -0,0 +1,33 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.launcher.core.auth.yggdrasil;
+
+/**
+ *
+ * @author huang
+ */
+public class ValidateRequest {
+    private String clientToken;
+    private String accessToken;
+    
+    public ValidateRequest(YggdrasilAuthentication authentication) {
+        clientToken = authentication.getClientToken();
+        accessToken = authentication.getAuthenticatedToken();
+    }
+    
+}
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/download/DownloadType.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/download/DownloadType.java
index d5841de85..56c014acb 100755
--- a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/download/DownloadType.java
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/download/DownloadType.java
@@ -17,6 +17,8 @@
  */
 package org.jackhuang.hellominecraft.launcher.core.download;
 
+import org.jackhuang.hellominecraft.api.HMCLAPI;
+import org.jackhuang.hellominecraft.launcher.api.event.config.DownloadTypeChangedEvent;
 import org.jackhuang.hellominecraft.util.C;
 import org.jackhuang.hellominecraft.util.task.TaskWindow;
 
@@ -59,4 +61,7 @@ public enum DownloadType {
         DownloadType.suggestedDownloadType = suggestedDownloadType;
     }
 
+    static {
+        HMCLAPI.EVENT_BUS.channel(DownloadTypeChangedEvent.class).register(t -> setSuggestedDownloadType(t.getValue()));
+    }
 }
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/download/MinecraftDownloadService.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/download/MinecraftDownloadService.java
index 8507570f2..f06206cda 100755
--- a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/download/MinecraftDownloadService.java
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/download/MinecraftDownloadService.java
@@ -17,6 +17,7 @@
  */
 package org.jackhuang.hellominecraft.launcher.core.download;
 
+import org.jackhuang.hellominecraft.launcher.api.event.launch.DownloadLibraryJob;
 import org.jackhuang.hellominecraft.launcher.core.service.IMinecraftDownloadService;
 import com.google.gson.JsonSyntaxException;
 import java.io.File;
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/launch/DefaultGameLauncher.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/launch/DefaultGameLauncher.java
index 562bdba57..3bf29b070 100755
--- a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/launch/DefaultGameLauncher.java
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/launch/DefaultGameLauncher.java
@@ -19,16 +19,22 @@ package org.jackhuang.hellominecraft.launcher.core.launch;
 
 import java.io.IOException;
 import java.util.HashSet;
-import org.jackhuang.hellominecraft.util.C;
-import org.jackhuang.hellominecraft.util.log.HMCLog;
+import java.util.List;
+import org.jackhuang.hellominecraft.api.HMCLAPI;
+import org.jackhuang.hellominecraft.api.ResultedSimpleEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.DecompressLibrariesEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.DownloadLibrariesEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.DownloadLibraryJob;
 import org.jackhuang.hellominecraft.launcher.core.auth.IAuthenticator;
 import org.jackhuang.hellominecraft.launcher.core.auth.LoginInfo;
-import org.jackhuang.hellominecraft.launcher.core.download.DownloadLibraryJob;
 import org.jackhuang.hellominecraft.launcher.core.service.IMinecraftService;
+import org.jackhuang.hellominecraft.util.C;
+import org.jackhuang.hellominecraft.util.MessageBox;
+import org.jackhuang.hellominecraft.util.log.HMCLog;
+import org.jackhuang.hellominecraft.util.sys.CompressingUtils;
 import org.jackhuang.hellominecraft.util.task.ParallelTask;
 import org.jackhuang.hellominecraft.util.task.TaskWindow;
-import org.jackhuang.hellominecraft.util.sys.CompressingUtils;
-import org.jackhuang.hellominecraft.util.MessageBox;
+
 
 public class DefaultGameLauncher extends GameLauncher {
 
@@ -38,11 +44,12 @@ public class DefaultGameLauncher extends GameLauncher {
     }
 
     private void register() {
-        downloadLibrariesEvent.register((sender, t) -> {
+        HMCLAPI.EVENT_BUS.channel(DownloadLibrariesEvent.class).register(t -> {
+            ResultedSimpleEvent<List<DownloadLibraryJob>> event = (ResultedSimpleEvent) t;
             final TaskWindow.TaskWindowFactory dw = TaskWindow.factory();
             ParallelTask parallelTask = new ParallelTask();
             HashSet<String> names = new HashSet<>();
-            for (DownloadLibraryJob s : t) {
+            for (DownloadLibraryJob s : t.getValue()) {
                 if (names.contains(s.lib.name))
                     continue;
                 names.add(s.lib.name);
@@ -50,22 +57,23 @@ public class DefaultGameLauncher extends GameLauncher {
             }
             dw.append(parallelTask);
             boolean flag = true;
-            if (t.size() > 0)
+            if (t.getValue().size() > 0)
                 flag = dw.execute();
             if (!flag && MessageBox.show(C.i18n("launch.not_finished_downloading_libraries"), MessageBox.YES_NO_OPTION) == MessageBox.YES_OPTION)
                 flag = true;
-            return flag;
+            t.setResult(flag);
         });
-        decompressNativesEvent.register((sender, value) -> {
-            if (value == null)
-                return false;
-            for (int i = 0; i < value.decompressFiles.length; i++)
+        HMCLAPI.EVENT_BUS.channel(DecompressLibrariesEvent.class).register(t -> {
+            if (t.getValue() == null) {
+                t.setResult(false);
+                return;
+            }
+            for (int i = 0; i < t.getValue().decompressFiles.length; i++)
                 try {
-                    CompressingUtils.unzip(value.decompressFiles[i], value.getDecompressTo(), value.extractRules[i]::allow, false);
+                    CompressingUtils.unzip(t.getValue().decompressFiles[i], t.getValue().getDecompressTo(), t.getValue().extractRules[i]::allow, false);
                 } catch (IOException ex) {
-                    HMCLog.err("Unable to decompress library: " + value.decompressFiles[i] + " to " + value.getDecompressTo(), ex);
+                    HMCLog.err("Unable to decompress library: " + t.getValue().decompressFiles[i] + " to " + t.getValue().getDecompressTo(), ex);
                 }
-            return true;
         });
     }
 
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/launch/GameLauncher.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/launch/GameLauncher.java
index 7929359a2..c4f73cfab 100755
--- a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/launch/GameLauncher.java
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/launch/GameLauncher.java
@@ -23,18 +23,24 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.OutputStreamWriter;
 import java.util.List;
-import org.jackhuang.hellominecraft.launcher.api.PluginManager;
+import org.jackhuang.hellominecraft.api.HMCLAPI;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.DecompressLibrariesEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.DecompressLibraryJob;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.DownloadLibrariesEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.LaunchEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.LaunchSucceededEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.LaunchingState;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.LaunchingStateChangedEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.ProcessingLoginResultEvent;
 import org.jackhuang.hellominecraft.launcher.core.GameException;
+import org.jackhuang.hellominecraft.launcher.core.RuntimeGameException;
 import org.jackhuang.hellominecraft.launcher.core.auth.AuthenticationException;
 import org.jackhuang.hellominecraft.launcher.core.auth.IAuthenticator;
 import org.jackhuang.hellominecraft.launcher.core.auth.LoginInfo;
 import org.jackhuang.hellominecraft.launcher.core.auth.UserProfileProvider;
-import org.jackhuang.hellominecraft.launcher.core.download.DownloadLibraryJob;
 import org.jackhuang.hellominecraft.launcher.core.service.IMinecraftLoader;
 import org.jackhuang.hellominecraft.launcher.core.service.IMinecraftService;
-import org.jackhuang.hellominecraft.launcher.core.version.DecompressLibraryJob;
 import org.jackhuang.hellominecraft.util.C;
-import org.jackhuang.hellominecraft.util.EventHandler;
 import org.jackhuang.hellominecraft.util.StrUtils;
 import org.jackhuang.hellominecraft.util.code.Charsets;
 import org.jackhuang.hellominecraft.util.log.HMCLog;
@@ -52,11 +58,6 @@ public class GameLauncher {
     LoginInfo info;
     UserProfileProvider result;
     IAuthenticator login;
-    public final EventHandler<List<DownloadLibraryJob>> downloadLibrariesEvent = new EventHandler<>(this);
-    public final EventHandler<List<String>> successEvent = new EventHandler<>(this);
-    public final EventHandler<JavaProcess> launchEvent = new EventHandler<>(this);
-    public final EventHandler<LaunchingState> launchingStateChangedEvent = new EventHandler<>(this);
-    public final EventHandler<DecompressLibraryJob> decompressNativesEvent = new EventHandler<>(this);
 
     public GameLauncher(LaunchOptions options, IMinecraftService version, LoginInfo info, IAuthenticator lg) {
         this.options = options;
@@ -75,10 +76,21 @@ public class GameLauncher {
         this.tag = tag;
     }
 
-    public IMinecraftLoader makeLaunchCommand() throws AuthenticationException, GameException {
+    /**
+     * Generates the launch command.
+     * @throws AuthenticationException having trouble logging in.
+     * @throws GameException having trouble completing the game or making lanch command.
+     * @throws RuntimeGameException will be thrown when someone processing login result.
+     * @see LaunchingStateChangedEvent
+     * @see DecompressLibrariesEvent
+     * @see LaunchSucceededEvent
+     * @see DownloadLibrariesEvent
+     * @see ProcessingLoginResultEvent
+     */
+    public void makeLaunchCommand() throws AuthenticationException, GameException, RuntimeGameException {
         HMCLog.log("Building process");
         HMCLog.log("Logging in...");
-        launchingStateChangedEvent.execute(LaunchingState.LoggingIn);
+        HMCLAPI.EVENT_BUS.fireChannel(new LaunchingStateChangedEvent(this, LaunchingState.LoggingIn));
         IMinecraftLoader loader;
         if (info != null)
             result = login.login(info);
@@ -86,9 +98,9 @@ public class GameLauncher {
             result = login.loginBySettings();
         if (result == null)
             throw new AuthenticationException("Result can not be null.");
-        PluginManager.plugin().onProcessingLoginResult(result);
+        HMCLAPI.EVENT_BUS.fireChannel(new ProcessingLoginResultEvent(this, result));
 
-        launchingStateChangedEvent.execute(LaunchingState.GeneratingLaunchingCodes);
+        HMCLAPI.EVENT_BUS.fireChannel(new LaunchingStateChangedEvent(this, LaunchingState.GeneratingLaunchingCodes));
         loader = service.launch(options, result);
 
         File file = service.version().getDecompressNativesToLocation(loader.getMinecraftVersion());
@@ -97,19 +109,18 @@ public class GameLauncher {
 
         if (!options.isNotCheckGame()) {
             HMCLog.log("Detecting libraries...");
-            launchingStateChangedEvent.execute(LaunchingState.DownloadingLibraries);
-            if (!downloadLibrariesEvent.execute(service.download().getDownloadLibraries(loader.getMinecraftVersion())))
+            HMCLAPI.EVENT_BUS.fireChannel(new LaunchingStateChangedEvent(this, LaunchingState.DownloadingLibraries));
+            if (!HMCLAPI.EVENT_BUS.fireChannelResulted(new DownloadLibrariesEvent(this, service.download().getDownloadLibraries(loader.getMinecraftVersion()))))
                 throw new GameException("Failed to download libraries");
         }
 
         HMCLog.log("Unpacking natives...");
-        launchingStateChangedEvent.execute(LaunchingState.DecompressingNatives);
+        HMCLAPI.EVENT_BUS.fireChannel(new LaunchingStateChangedEvent(this, LaunchingState.DecompressingNatives));
         DecompressLibraryJob job = service.version().getDecompressLibraries(loader.getMinecraftVersion());
-        if (!decompressNativesEvent.execute(job))
+        if (!HMCLAPI.EVENT_BUS.fireChannelResulted(new DecompressLibrariesEvent(this, job)))
             throw new GameException("Failed to decompress natives");
 
-        successEvent.execute(loader.makeLaunchingCommand());
-        return loader;
+        HMCLAPI.EVENT_BUS.fireChannel(new LaunchSucceededEvent(this, loader.makeLaunchingCommand()));
     }
 
     /**
@@ -139,7 +150,7 @@ public class GameLauncher {
                 .environment().put("APPDATA", service.baseDirectory().getAbsolutePath());
         JavaProcess jp = new JavaProcess(str, builder.start(), PROCESS_MANAGER);
         HMCLog.log("Have started the process");
-        launchEvent.execute(jp);
+        HMCLAPI.EVENT_BUS.fireChannel(new LaunchEvent(this, jp));
     }
 
     /**
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/launch/LibraryDownloadTask.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/launch/LibraryDownloadTask.java
index 9d497eb3d..d88e5f557 100755
--- a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/launch/LibraryDownloadTask.java
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/launch/LibraryDownloadTask.java
@@ -18,7 +18,7 @@
 package org.jackhuang.hellominecraft.launcher.core.launch;
 
 import org.jackhuang.hellominecraft.util.C;
-import org.jackhuang.hellominecraft.launcher.core.download.DownloadLibraryJob;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.DownloadLibraryJob;
 import org.jackhuang.hellominecraft.util.net.FileDownloadTask;
 
 /**
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/service/IMinecraftDownloadService.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/service/IMinecraftDownloadService.java
index 1ef511137..e28b3d1cf 100755
--- a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/service/IMinecraftDownloadService.java
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/service/IMinecraftDownloadService.java
@@ -20,7 +20,7 @@ package org.jackhuang.hellominecraft.launcher.core.service;
 import java.io.File;
 import java.util.List;
 import org.jackhuang.hellominecraft.launcher.core.GameException;
-import org.jackhuang.hellominecraft.launcher.core.download.DownloadLibraryJob;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.DownloadLibraryJob;
 import org.jackhuang.hellominecraft.launcher.core.version.MinecraftVersion;
 import org.jackhuang.hellominecraft.util.task.Task;
 
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/service/IMinecraftProvider.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/service/IMinecraftProvider.java
index 1d04228fe..bbb634ca4 100755
--- a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/service/IMinecraftProvider.java
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/service/IMinecraftProvider.java
@@ -20,9 +20,9 @@ package org.jackhuang.hellominecraft.launcher.core.service;
 import java.io.File;
 import java.util.Collection;
 import org.jackhuang.hellominecraft.launcher.core.GameException;
-import org.jackhuang.hellominecraft.launcher.core.version.DecompressLibraryJob;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.DecompressLibraryJob;
 import org.jackhuang.hellominecraft.launcher.core.version.MinecraftVersion;
-import org.jackhuang.hellominecraft.util.EventHandler;
+import org.jackhuang.hellominecraft.api.EventHandler;
 import org.jackhuang.hellominecraft.util.func.Consumer;
 import org.jackhuang.hellominecraft.util.func.Predicate;
 
@@ -143,10 +143,6 @@ public abstract class IMinecraftProvider {
      */
     public abstract void refreshVersions();
 
-    public final EventHandler<IMinecraftService> onRefreshingVersions = new EventHandler<>(this),
-        onRefreshedVersions = new EventHandler<>(this);
-    public final EventHandler<String> onLoadedVersion = new EventHandler<>(this);
-
     /**
      * Clean redundant files.
      */
diff --git a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/version/MinecraftVersionManager.java b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/version/MinecraftVersionManager.java
index 8304bd975..45fe06c73 100755
--- a/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/version/MinecraftVersionManager.java
+++ b/HMCL/src/core/java/org/jackhuang/hellominecraft/launcher/core/version/MinecraftVersionManager.java
@@ -17,6 +17,7 @@
  */
 package org.jackhuang.hellominecraft.launcher.core.version;
 
+import org.jackhuang.hellominecraft.launcher.api.event.launch.DecompressLibraryJob;
 import com.google.gson.JsonSyntaxException;
 import java.io.File;
 import java.io.IOException;
@@ -24,6 +25,10 @@ import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Map;
 import java.util.TreeMap;
+import org.jackhuang.hellominecraft.api.HMCLAPI;
+import org.jackhuang.hellominecraft.launcher.api.event.version.LoadedOneVersionEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.version.RefreshedVersionsEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.version.RefreshingVersionsEvent;
 import org.jackhuang.hellominecraft.util.C;
 import org.jackhuang.hellominecraft.util.log.HMCLog;
 import org.jackhuang.hellominecraft.launcher.core.GameException;
@@ -67,7 +72,7 @@ public class MinecraftVersionManager extends IMinecraftProvider {
 
     @Override
     public synchronized void refreshVersions() {
-        onRefreshingVersions.execute(service);
+        HMCLAPI.EVENT_BUS.fireChannel(new RefreshingVersionsEvent(this, service));
 
         try {
             MCUtils.tryWriteProfile(service.baseDirectory());
@@ -137,12 +142,12 @@ public class MinecraftVersionManager extends IMinecraftProvider {
                     }
 
                     versions.put(id, mcVersion);
-                    onLoadedVersion.execute(id);
+                    HMCLAPI.EVENT_BUS.fireChannel(new LoadedOneVersionEvent(this, id));
                 } catch (Exception e) {
                     HMCLog.warn("Ignoring: " + dir + ", the json of this Minecraft is malformed.", e);
                 }
             }
-        onRefreshedVersions.execute(service);
+        HMCLAPI.EVENT_BUS.fireChannel(new RefreshedVersionsEvent(this, service));
     }
 
     @Override
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/Main.java b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/Main.java
index d0c4bd4e2..4bc5c2c2a 100644
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/Main.java
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/Main.java
@@ -143,10 +143,9 @@ public final class Main implements Runnable {
                     SupportedLocales.NOW_LOCALE = sl;
                     Locale.setDefault(sl.self);
                 }
-            
-            if (System.getProperty("java.vm.name").contains("Open")) { // OpenJDK
+
+            if (System.getProperty("java.vm.name").contains("Open")) // OpenJDK
                 MessageBox.showLocalized("ui.message.open_jdk");
-            }
 
             try {
                 LOOK_AND_FEEL = new HelloMinecraftLookAndFeel(Settings.getInstance().getTheme().settings);
@@ -155,11 +154,11 @@ public final class Main implements Runnable {
             } catch (ParseException | UnsupportedLookAndFeelException ex) {
                 HMCLog.warn("Failed to set look and feel...", ex);
             }
-            
+
             LogWindow.INSTANCE.clean();
             LogWindow.INSTANCE.setTerminateGame(GameLauncher.PROCESS_MANAGER::stopAllProcesses);
 
-            Settings.UPDATE_CHECKER.outOfDateEvent.register(IUpgrader.NOW_UPGRADER);
+            Settings.UPDATE_CHECKER.upgrade.register(IUpgrader.NOW_UPGRADER);
             Settings.UPDATE_CHECKER.process(false).reg(t -> Main.invokeUpdate()).execute();
 
             if (StrUtils.isNotBlank(Settings.getInstance().getProxyHost()) && StrUtils.isNotBlank(Settings.getInstance().getProxyPort()) && MathUtils.canParseInt(Settings.getInstance().getProxyPort())) {
@@ -175,12 +174,7 @@ public final class Main implements Runnable {
                     });
             }
 
-            try {
-                PluginManager.plugin().showUI();
-            } catch (Throwable t) {
-                new CrashReporter(false).uncaughtException(Thread.currentThread(), t);
-                System.exit(1);
-            }
+            MainFrame.showMainFrame();
         }
     }
 
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/setting/Config.java b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/setting/Config.java
index 53685eed0..1d6060000 100755
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/setting/Config.java
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/setting/Config.java
@@ -27,7 +27,10 @@ import java.util.TreeMap;
 import java.util.UUID;
 import org.jackhuang.hellominecraft.launcher.core.auth.IAuthenticator;
 import org.jackhuang.hellominecraft.lookandfeel.Theme;
-import org.jackhuang.hellominecraft.util.EventHandler;
+import org.jackhuang.hellominecraft.api.HMCLAPI;
+import org.jackhuang.hellominecraft.launcher.api.event.config.AuthenticatorChangedEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.config.DownloadTypeChangedEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.config.ThemeChangedEvent;
 import org.jackhuang.hellominecraft.util.sys.JdkVersion;
 import org.jackhuang.hellominecraft.util.sys.OS;
 
@@ -78,10 +81,6 @@ public final class Config implements Cloneable {
         return java == null ? java = new ArrayList<>() : java;
     }
 
-    public transient final EventHandler<Theme> themeChangedEvent = new EventHandler<>(this);
-    public transient final EventHandler<DownloadType> downloadTypeChangedEvent = new EventHandler<>(this);
-    public transient final EventHandler<IAuthenticator> authChangedEvent = new EventHandler<>(this);
-
     public Theme getTheme() {
         if (theme >= Theme.values().length)
             theme = 0;
@@ -90,7 +89,7 @@ public final class Config implements Cloneable {
 
     public void setTheme(int theme) {
         this.theme = theme;
-        themeChangedEvent.execute(getTheme());
+        HMCLAPI.EVENT_BUS.fireChannel(new ThemeChangedEvent(this, getTheme()));
         Settings.save();
     }
 
@@ -171,7 +170,7 @@ public final class Config implements Cloneable {
         if (logintype < 0 || logintype >= IAuthenticator.LOGINS.size())
             return;
         this.logintype = logintype;
-        authChangedEvent.execute(IAuthenticator.LOGINS.get(logintype));
+        HMCLAPI.EVENT_BUS.fireChannel(new AuthenticatorChangedEvent(this, IAuthenticator.LOGINS.get(logintype)));
         Settings.save();
     }
 
@@ -181,7 +180,7 @@ public final class Config implements Cloneable {
 
     public void setDownloadType(int downloadtype) {
         this.downloadtype = downloadtype;
-        downloadTypeChangedEvent.execute(getDownloadSource());
+        HMCLAPI.EVENT_BUS.fireChannel(new DownloadTypeChangedEvent(this, getDownloadSource()));
         Settings.save();
     }
 
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/setting/Profile.java b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/setting/Profile.java
index 841096b41..2d66b4ff3 100755
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/setting/Profile.java
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/setting/Profile.java
@@ -21,13 +21,12 @@ import com.google.gson.annotations.SerializedName;
 import org.jackhuang.hellominecraft.launcher.util.HMCLGameLauncher;
 import org.jackhuang.hellominecraft.launcher.util.HMCLMinecraftService;
 import java.io.File;
-import org.jackhuang.hellominecraft.launcher.api.PluginManager;
 import org.jackhuang.hellominecraft.launcher.core.MCUtils;
-import org.jackhuang.hellominecraft.launcher.core.service.IMinecraftService;
 import org.jackhuang.hellominecraft.launcher.core.version.MinecraftVersion;
 import org.jackhuang.hellominecraft.util.sys.IOUtils;
 import org.jackhuang.hellominecraft.util.StrUtils;
-import org.jackhuang.hellominecraft.util.EventHandler;
+import org.jackhuang.hellominecraft.api.EventHandler;
+import org.jackhuang.hellominecraft.api.PropertyChangedEvent;
 import org.jackhuang.hellominecraft.util.sys.OS;
 
 /**
@@ -45,9 +44,9 @@ public final class Profile {
     @SerializedName("global")
     private VersionSetting global;
 
-    private transient IMinecraftService service;
+    private transient HMCLMinecraftService service;
     private transient HMCLGameLauncher launcher = new HMCLGameLauncher(this);
-    public transient final EventHandler<String> propertyChanged = new EventHandler<>(this);
+    public transient final EventHandler<PropertyChangedEvent<String>> propertyChanged = new EventHandler<>();
 
     public Profile() {
         this("Default");
@@ -71,9 +70,9 @@ public final class Profile {
         gameDir = v.gameDir;
     }
 
-    public IMinecraftService service() {
+    public HMCLMinecraftService service() {
         if (service == null)
-            service = PluginManager.plugin().provideMinecraftService(this);
+            service = new HMCLMinecraftService(this);
         return service;
     }
 
@@ -86,7 +85,7 @@ public final class Profile {
     }
 
     public VersionSetting getVersionSetting(String id) {
-        VersionSetting vs = ((HMCLMinecraftService) service()).getVersionSetting(id);
+        VersionSetting vs = service().getVersionSetting(id);
         if (vs == null || vs.isUsesGlobal()) {
             global.isGlobal = true;
             global.id = id;
@@ -96,23 +95,21 @@ public final class Profile {
     }
     
     public boolean isVersionSettingGlobe(String id) {
-        VersionSetting vs = ((HMCLMinecraftService) service()).getVersionSetting(id);
+        VersionSetting vs = service().getVersionSetting(id);
         return vs == null || vs.isUsesGlobal();
     }
 
     public void makeVersionSettingSpecial(String id) {
-        HMCLMinecraftService s = (HMCLMinecraftService) service();
-        VersionSetting vs = s.getVersionSetting(id);
+        VersionSetting vs = service().getVersionSetting(id);
         if (vs == null) {
-            s.createVersionSetting(id);
-            vs = s.getVersionSetting(id);
+            service().createVersionSetting(id);
+            vs = service().getVersionSetting(id);
             if (vs == null)
                 return;
             vs.setUsesGlobal(false);
         } else
             vs.setUsesGlobal(false);
-        propertyChanged.execute("selectedMinecraftVersion");
-        selectedVersionChangedEvent.execute(selectedMinecraftVersion);
+        propertyChanged.fire(new PropertyChangedEvent<>(this, "selectedMinecraftVersion", selectedMinecraftVersion, selectedMinecraftVersion));
     }
 
     public void makeVersionSettingGlobal(String id) {
@@ -121,8 +118,7 @@ public final class Profile {
         if (vs == null)
             return;
         vs.setUsesGlobal(true);
-        propertyChanged.execute("selectedMinecraftVersion");
-        selectedVersionChangedEvent.execute(selectedMinecraftVersion);
+        propertyChanged.fire(new PropertyChangedEvent<>(this, "selectedMinecraftVersion", selectedMinecraftVersion, selectedMinecraftVersion));
     }
 
     public String getSettingsSelectedMinecraftVersion() {
@@ -141,12 +137,10 @@ public final class Profile {
         return StrUtils.isBlank(v) ? null : v;
     }
 
-    public transient final EventHandler<String> selectedVersionChangedEvent = new EventHandler<>(this);
-
     public void setSelectedMinecraftVersion(String selectedMinecraftVersion) {
+        PropertyChangedEvent event = new PropertyChangedEvent<>(this, "selectedMinecraftVersion", this.selectedMinecraftVersion, selectedMinecraftVersion);
         this.selectedMinecraftVersion = selectedMinecraftVersion;
-        propertyChanged.execute("selectedMinecraftVersion");
-        selectedVersionChangedEvent.execute(selectedMinecraftVersion);
+        propertyChanged.fire(event);
     }
 
     public String getGameDir() {
@@ -168,9 +162,10 @@ public final class Profile {
     }
 
     public Profile setGameDir(String gameDir) {
+        PropertyChangedEvent event = new PropertyChangedEvent<>(this, "gameDir", this.gameDir, gameDir);
         this.gameDir = gameDir;
         service().version().refreshVersions();
-        propertyChanged.execute("gameDir");
+        propertyChanged.fire(event);
         return this;
     }
 
@@ -179,8 +174,9 @@ public final class Profile {
     }
 
     void setName(String name) {
+        PropertyChangedEvent event = new PropertyChangedEvent<>(this, "name", this.name, name);
         this.name = name;
-        propertyChanged.execute("name");
+        propertyChanged.fire(event);
     }
 
     public void checkFormat() {
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/setting/Settings.java b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/setting/Settings.java
index 95ba5f9d3..dc46a07d2 100755
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/setting/Settings.java
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/setting/Settings.java
@@ -28,7 +28,9 @@ import org.jackhuang.hellominecraft.launcher.Main;
 import org.jackhuang.hellominecraft.launcher.core.MCUtils;
 import org.jackhuang.hellominecraft.launcher.core.download.DownloadType;
 import org.jackhuang.hellominecraft.util.CollectionUtils;
-import org.jackhuang.hellominecraft.util.EventHandler;
+import org.jackhuang.hellominecraft.api.HMCLAPI;
+import org.jackhuang.hellominecraft.launcher.api.event.config.ProfileChangedEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.config.ProfileLoadingEvent;
 import org.jackhuang.hellominecraft.util.sys.FileUtils;
 import org.jackhuang.hellominecraft.util.MessageBox;
 import org.jackhuang.hellominecraft.util.UpdateChecker;
@@ -54,7 +56,6 @@ public final class Settings {
 
     static {
         SETTINGS = initSettings();
-        SETTINGS.downloadTypeChangedEvent.register(DownloadType::setSuggestedDownloadType);
         DownloadType.setSuggestedDownloadType(SETTINGS.getDownloadSource());
         if (!getProfiles().containsKey(DEFAULT_PROFILE))
             getProfiles().put(DEFAULT_PROFILE, new Profile(DEFAULT_PROFILE));
@@ -156,19 +157,16 @@ public final class Settings {
         return flag;
     }
 
-    public static final EventHandler<Profile> profileChangedEvent = new EventHandler<>(null);
-    public static final EventHandler<Void> profileLoadingEvent = new EventHandler<>(null);
-
     static void onProfileChanged() {
         Profile p = getLastProfile();
         if (p == null)
             throw new Error("No profiles here, it should not happen");
-        profileChangedEvent.execute(p);
+        HMCLAPI.EVENT_BUS.fireChannel(new ProfileChangedEvent(SETTINGS, p.getName()));
         p.onSelected();
     }
 
     public static void onProfileLoading() {
-        profileLoadingEvent.execute(null);
+        HMCLAPI.EVENT_BUS.fireChannel(new ProfileLoadingEvent(SETTINGS));
         onProfileChanged();
     }
 }
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/setting/VersionSetting.java b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/setting/VersionSetting.java
index b34f18399..dd4c27644 100644
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/setting/VersionSetting.java
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/setting/VersionSetting.java
@@ -25,7 +25,8 @@ import org.jackhuang.hellominecraft.launcher.util.LauncherVisibility;
 import org.jackhuang.hellominecraft.launcher.core.launch.LaunchOptions;
 import org.jackhuang.hellominecraft.launcher.core.version.GameDirType;
 import org.jackhuang.hellominecraft.util.C;
-import org.jackhuang.hellominecraft.util.EventHandler;
+import org.jackhuang.hellominecraft.api.EventHandler;
+import org.jackhuang.hellominecraft.api.PropertyChangedEvent;
 import org.jackhuang.hellominecraft.util.StrUtils;
 import org.jackhuang.hellominecraft.util.log.HMCLog;
 import org.jackhuang.hellominecraft.util.sys.Java;
@@ -87,7 +88,7 @@ public class VersionSetting {
     @SerializedName("gameDirType")
     private int gameDirType;
 
-    public transient final EventHandler<String> propertyChanged = new EventHandler<>(this);
+    public transient final EventHandler<PropertyChangedEvent> propertyChanged = new EventHandler<>();
 
     public VersionSetting() {
         fullscreen = usesGlobal = false;
@@ -113,8 +114,9 @@ public class VersionSetting {
     }
 
     public void setJavaDir(String javaDir) {
+        PropertyChangedEvent event = new PropertyChangedEvent(this, "javaDir", this.javaDir, javaDir);
         this.javaDir = javaDir;
-        propertyChanged.execute("javaDir");
+        propertyChanged.fire(event);
     }
 
     public Java getJava() {
@@ -133,6 +135,7 @@ public class VersionSetting {
     }
 
     public void setJava(Java java) {
+        PropertyChangedEvent event = new PropertyChangedEvent(this, "java", this.java, java);
         if (java == null)
             this.java = Java.JAVA.get(0).getName();
         else {
@@ -141,7 +144,7 @@ public class VersionSetting {
                 return;
             this.java = java.getName();
         }
-        propertyChanged.execute("java");
+        propertyChanged.fire(event);
     }
 
     public String getJavaArgs() {
@@ -151,8 +154,9 @@ public class VersionSetting {
     }
 
     public void setJavaArgs(String javaArgs) {
+        PropertyChangedEvent event = new PropertyChangedEvent(this, "javaArgs", this.javaArgs, javaArgs);
         this.javaArgs = javaArgs;
-        propertyChanged.execute("javaArgs");
+        propertyChanged.fire(event);
     }
 
     public String getMaxMemory() {
@@ -162,8 +166,9 @@ public class VersionSetting {
     }
 
     public void setMaxMemory(String maxMemory) {
+        PropertyChangedEvent event = new PropertyChangedEvent(this, "maxMemory", this.maxMemory, maxMemory);
         this.maxMemory = maxMemory;
-        propertyChanged.execute("maxMemory");
+        propertyChanged.fire(event);
     }
 
     public String getWidth() {
@@ -173,8 +178,9 @@ public class VersionSetting {
     }
 
     public void setWidth(String width) {
+        PropertyChangedEvent event = new PropertyChangedEvent(this, "width", this.width, width);
         this.width = width;
-        propertyChanged.execute("width");
+        propertyChanged.fire(event);
     }
 
     public String getHeight() {
@@ -184,8 +190,9 @@ public class VersionSetting {
     }
 
     public void setHeight(String height) {
+        PropertyChangedEvent event = new PropertyChangedEvent(this, "height", this.height, height);
         this.height = height;
-        propertyChanged.execute("height");
+        propertyChanged.fire(event);
     }
 
     public boolean isFullscreen() {
@@ -193,8 +200,9 @@ public class VersionSetting {
     }
 
     public void setFullscreen(boolean fullscreen) {
+        PropertyChangedEvent event = new PropertyChangedEvent(this, "fullscreen", this.fullscreen, fullscreen);
         this.fullscreen = fullscreen;
-        propertyChanged.execute("fullscreen");
+        propertyChanged.fire(event);
     }
 
     public LauncherVisibility getLauncherVisibility() {
@@ -202,8 +210,9 @@ public class VersionSetting {
     }
 
     public void setLauncherVisibility(LauncherVisibility launcherVisibility) {
+        PropertyChangedEvent event = new PropertyChangedEvent(this, "launcherVisibility", this.launcherVisibility, launcherVisibility);
         this.launcherVisibility = launcherVisibility.ordinal();
-        propertyChanged.execute("launcherVisibility");
+        propertyChanged.fire(event);
     }
 
     public GameDirType getGameDirType() {
@@ -213,8 +222,9 @@ public class VersionSetting {
     }
 
     public void setGameDirType(GameDirType gameDirType) {
+        PropertyChangedEvent event = new PropertyChangedEvent(this, "gameDirType", this.gameDirType, gameDirType);
         this.gameDirType = gameDirType.ordinal();
-        propertyChanged.execute("gameDirType");
+        propertyChanged.fire(event);
     }
 
     public String getPermSize() {
@@ -222,8 +232,9 @@ public class VersionSetting {
     }
 
     public void setPermSize(String permSize) {
+        PropertyChangedEvent event = new PropertyChangedEvent(this, "permSize", this.permSize, permSize);
         this.permSize = permSize;
-        propertyChanged.execute("permSize");
+        propertyChanged.fire(event);
     }
 
     public boolean isNoJVMArgs() {
@@ -231,8 +242,9 @@ public class VersionSetting {
     }
 
     public void setNoJVMArgs(boolean noJVMArgs) {
+        PropertyChangedEvent event = new PropertyChangedEvent(this, "noJVMArgs", this.noJVMArgs, noJVMArgs);
         this.noJVMArgs = noJVMArgs;
-        propertyChanged.execute("noJVMArgs");
+        propertyChanged.fire(event);
     }
 
     public String getMinecraftArgs() {
@@ -240,8 +252,9 @@ public class VersionSetting {
     }
 
     public void setMinecraftArgs(String minecraftArgs) {
+        PropertyChangedEvent event = new PropertyChangedEvent(this, "minecraftArgs", this.minecraftArgs, minecraftArgs);
         this.minecraftArgs = minecraftArgs;
-        propertyChanged.execute("minecraftArgs");
+        propertyChanged.fire(event);
     }
 
     public String getPrecalledCommand() {
@@ -249,8 +262,9 @@ public class VersionSetting {
     }
 
     public void setPrecalledCommand(String precalledCommand) {
+        PropertyChangedEvent event = new PropertyChangedEvent(this, "precalledCommand", this.precalledCommand, precalledCommand);
         this.precalledCommand = precalledCommand;
-        propertyChanged.execute("precalledCommand");
+        propertyChanged.fire(event);
     }
 
     public String getWrapper() {
@@ -258,8 +272,9 @@ public class VersionSetting {
     }
 
     public void setWrapper(String wrapper) {
+        PropertyChangedEvent event = new PropertyChangedEvent(this, "wrapper", this.wrapper, wrapper);
         this.wrapper = wrapper;
-        propertyChanged.execute("wrapper");
+        propertyChanged.fire(event);
     }
 
     public String getServerIp() {
@@ -267,8 +282,9 @@ public class VersionSetting {
     }
 
     public void setServerIp(String serverIp) {
+        PropertyChangedEvent event = new PropertyChangedEvent(this, "serverIp", this.serverIp, serverIp);
         this.serverIp = serverIp;
-        propertyChanged.execute("serverIp");
+        propertyChanged.fire(event);
     }
 
     public boolean isNotCheckGame() {
@@ -276,8 +292,9 @@ public class VersionSetting {
     }
 
     public void setNotCheckGame(boolean notCheckGame) {
+        PropertyChangedEvent event = new PropertyChangedEvent(this, "notCheckGame", this.notCheckGame, notCheckGame);
         this.notCheckGame = notCheckGame;
-        propertyChanged.execute("notCheckGame");
+        propertyChanged.fire(event);
     }
 
     public boolean isUsesGlobal() {
@@ -285,8 +302,9 @@ public class VersionSetting {
     }
 
     public void setUsesGlobal(boolean usesGlobal) {
+        PropertyChangedEvent event = new PropertyChangedEvent(this, "usesGlobal", this.usesGlobal, usesGlobal);
         this.usesGlobal = usesGlobal;
-        propertyChanged.execute("usesGlobal");
+        propertyChanged.fire(event);
     }
 
     public LaunchOptions createLaunchOptions(File gameDir) {
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/GameDownloadPanel.java b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/GameDownloadPanel.java
index 8e1c94fad..ca6c8351b 100755
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/GameDownloadPanel.java
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/GameDownloadPanel.java
@@ -17,6 +17,7 @@
  */
 package org.jackhuang.hellominecraft.launcher.ui;
 
+import org.jackhuang.hellominecraft.util.ui.Page;
 import javax.swing.table.DefaultTableModel;
 import org.jackhuang.hellominecraft.launcher.core.download.MinecraftRemoteVersions;
 import org.jackhuang.hellominecraft.launcher.setting.Settings;
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/GameSettingsPanel.form b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/GameSettingsPanel.form
index 5c0cbc5a9..2aa7d94ee 100755
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/GameSettingsPanel.form
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/GameSettingsPanel.form
@@ -52,7 +52,7 @@
           <Group type="102" alignment="0" attributes="0">
               <Component id="pnlTop" min="-2" max="-2" attributes="0"/>
               <EmptySpace max="-2" attributes="0"/>
-              <Component id="tabVersionEdit" pref="309" max="32767" attributes="0"/>
+              <Component id="tabVersionEdit" max="32767" attributes="0"/>
               <EmptySpace max="-2" attributes="0"/>
               <Group type="103" groupAlignment="3" attributes="0">
                   <Component id="btnTestGame" alignment="3" min="-2" max="-2" attributes="0"/>
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/GameSettingsPanel.java b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/GameSettingsPanel.java
index c216925d1..d04fab2be 100755
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/GameSettingsPanel.java
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/GameSettingsPanel.java
@@ -17,6 +17,7 @@
  */
 package org.jackhuang.hellominecraft.launcher.ui;
 
+import org.jackhuang.hellominecraft.util.ui.Page;
 import java.awt.datatransfer.DataFlavor;
 import java.awt.datatransfer.Transferable;
 import java.awt.datatransfer.UnsupportedFlavorException;
@@ -37,10 +38,15 @@ import javax.swing.DefaultComboBoxModel;
 import javax.swing.JMenuItem;
 import javax.swing.JOptionPane;
 import javax.swing.JPopupMenu;
+import javax.swing.SwingUtilities;
 import javax.swing.event.ChangeEvent;
 import javax.swing.event.ChangeListener;
 import javax.swing.event.TableModelEvent;
 import javax.swing.table.DefaultTableModel;
+import org.jackhuang.hellominecraft.api.HMCLAPI;
+import org.jackhuang.hellominecraft.launcher.api.event.config.ProfileChangedEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.config.ProfileLoadingEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.version.RefreshedVersionsEvent;
 import org.jackhuang.hellominecraft.launcher.core.GameException;
 import org.jackhuang.hellominecraft.util.C;
 import org.jackhuang.hellominecraft.util.log.HMCLog;
@@ -50,13 +56,11 @@ import org.jackhuang.hellominecraft.launcher.setting.Settings;
 import org.jackhuang.hellominecraft.launcher.util.FileNameFilter;
 import org.jackhuang.hellominecraft.launcher.core.mod.ModInfo;
 import org.jackhuang.hellominecraft.launcher.core.install.InstallerType;
-import org.jackhuang.hellominecraft.launcher.core.service.IMinecraftService;
 import org.jackhuang.hellominecraft.launcher.core.version.GameDirType;
 import org.jackhuang.hellominecraft.launcher.core.version.MinecraftVersion;
 import org.jackhuang.hellominecraft.launcher.setting.VersionSetting;
 import org.jackhuang.hellominecraft.util.MessageBox;
 import org.jackhuang.hellominecraft.util.AbstractSwingWorker;
-import org.jackhuang.hellominecraft.util.Event;
 import org.jackhuang.hellominecraft.util.MinecraftVersionRequest;
 import org.jackhuang.hellominecraft.util.sys.OS;
 import org.jackhuang.hellominecraft.util.StrUtils;
@@ -75,15 +79,24 @@ import org.jackhuang.hellominecraft.util.ui.LogWindow;
 public final class GameSettingsPanel extends RepaintPage implements DropTargetListener {
 
     boolean isLoading = false;
+    boolean showedNoVersion = false;
     public MinecraftVersionRequest minecraftVersion;
     String mcVersion;
 
     final InstallerPanel installerPanels[] = new InstallerPanel[InstallerType.values().length];
 
-    public GameSettingsPanel(MainFrame mf) {
-        mf.actions.put("showGameDownloads", () -> {
-            MainFrame.INSTANCE.selectTab("game");
-            showGameDownloads();
+    public GameSettingsPanel() {
+        HMCLAPI.EVENT_BUS.channel(RefreshedVersionsEvent.class).register(t -> {
+            if (Settings.getLastProfile().service() == t.getValue())
+                if (!showedNoVersion && Settings.getLastProfile().service().checkingModpack) {
+                    showedNoVersion = true;
+                    SwingUtilities.invokeLater(() -> {
+                        if (MessageBox.show(C.i18n("mainwindow.no_version"), MessageBox.YES_NO_OPTION) == MessageBox.YES_OPTION) {
+                            MainFrame.INSTANCE.selectTab("game");
+                            showGameDownloads();
+                        }
+                    });
+                }
         });
 
         setRepainter(this);
@@ -92,6 +105,8 @@ public final class GameSettingsPanel extends RepaintPage implements DropTargetLi
     void initGui() {
         initComponents();
 
+        animationEnabled = Settings.getInstance().isEnableAnimation();
+
         dropTarget = new DropTarget(this, DnDConstants.ACTION_COPY_OR_MOVE, this);
 
         for (int i = 0; i < InstallerType.values().length; i++)
@@ -108,8 +123,9 @@ public final class GameSettingsPanel extends RepaintPage implements DropTargetLi
             cboJava.addItem(j.getLocalizedName());
         isLoading = false;
 
-        Settings.profileLoadingEvent.register(onLoadingProfiles);
-        Settings.profileChangedEvent.register(onSelectedProfilesChanged);
+        HMCLAPI.EVENT_BUS.channel(ProfileLoadingEvent.class).register(onLoadingProfiles);
+        HMCLAPI.EVENT_BUS.channel(ProfileChangedEvent.class).register(onSelectedProfilesChanged);
+        HMCLAPI.EVENT_BUS.channel(RefreshedVersionsEvent.class).register(onRefreshedVersions);
     }
 
     void initExplorationMenu() {
@@ -1437,8 +1453,8 @@ public final class GameSettingsPanel extends RepaintPage implements DropTargetLi
         isLoading = false;
     }
 
-    final Consumer<IMinecraftService> onRefreshedVersions = t -> {
-        if (Settings.getLastProfile().service() == t)
+    final Consumer<RefreshedVersionsEvent> onRefreshedVersions = t -> {
+        if (Settings.getLastProfile().service() == t.getValue())
             loadVersions();
     };
 
@@ -1451,11 +1467,9 @@ public final class GameSettingsPanel extends RepaintPage implements DropTargetLi
         }
         cboVersions.setModel(model);
         if (Settings.getLastProfile().getSelectedVersion() != null)
-            selectedVersionChangedEvent.accept(Settings.getLastProfile().getSelectedVersion());
+            versionChanged(Settings.getLastProfile().getSelectedVersion());
     }
 
-    final Consumer<String> selectedVersionChangedEvent = this::versionChanged;
-
     public void versionChanged(String version) {
         isLoading = true;
         DefaultComboBoxModel<String> model = (DefaultComboBoxModel<String>) cboVersions.getModel();
@@ -1477,9 +1491,12 @@ public final class GameSettingsPanel extends RepaintPage implements DropTargetLi
         isLoading = false;
     }
 
-    final Consumer<Profile> onSelectedProfilesChanged = t -> {
-        t.service().version().onRefreshedVersions.register(onRefreshedVersions);
-        t.selectedVersionChangedEvent.register(selectedVersionChangedEvent);
+    final Consumer<ProfileChangedEvent> onSelectedProfilesChanged = event -> {
+        Profile t = Settings.getProfile(event.getValue());
+        t.propertyChanged.register(e -> {
+            if ("selectedMinecraftVersion".equals(e.getPropertyName()))
+                versionChanged(e.getNewValue());
+        });
 
         txtGameDir.setText(t.getGameDir());
 
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/InstallerPanel.java b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/InstallerPanel.java
index 4f6901cdb..ccc42742f 100755
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/InstallerPanel.java
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/InstallerPanel.java
@@ -17,6 +17,7 @@
  */
 package org.jackhuang.hellominecraft.launcher.ui;
 
+import org.jackhuang.hellominecraft.util.ui.Page;
 import java.util.List;
 import javax.swing.SwingUtilities;
 import javax.swing.table.DefaultTableModel;
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/LauncherSettingsPanel.java b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/LauncherSettingsPanel.java
index 8620a75ad..049bcf92e 100755
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/LauncherSettingsPanel.java
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/LauncherSettingsPanel.java
@@ -45,6 +45,8 @@ public class LauncherSettingsPanel extends RepaintPage {
 
     void initGui() {
         initComponents();
+        
+        animationEnabled = Settings.getInstance().isEnableAnimation();
 
         DefaultComboBoxModel<String> d = new DefaultComboBoxModel<>();
         for (DownloadType type : DownloadType.values())
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/LaunchingUIDaemon.java b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/LaunchingUIDaemon.java
index e88a07ce8..a4eece6ad 100644
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/LaunchingUIDaemon.java
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/LaunchingUIDaemon.java
@@ -19,16 +19,21 @@ package org.jackhuang.hellominecraft.launcher.ui;
 
 import java.io.File;
 import java.io.IOException;
-import java.util.List;
 import javax.swing.JOptionPane;
+import org.jackhuang.hellominecraft.api.HMCLAPI;
+import org.jackhuang.hellominecraft.api.event.process.JVMLaunchFailedEvent;
+import org.jackhuang.hellominecraft.api.event.process.JavaProcessExitedAbnormallyEvent;
+import org.jackhuang.hellominecraft.api.event.process.JavaProcessStoppedEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.LaunchEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.LaunchSucceededEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.LaunchingStateChangedEvent;
 import org.jackhuang.hellominecraft.launcher.util.LauncherVisibility;
 import org.jackhuang.hellominecraft.launcher.core.launch.GameLauncher;
-import org.jackhuang.hellominecraft.launcher.core.launch.LaunchingState;
 import org.jackhuang.hellominecraft.launcher.setting.Profile;
 import org.jackhuang.hellominecraft.launcher.setting.Settings;
+import org.jackhuang.hellominecraft.launcher.util.HMCLGameLauncher;
 import org.jackhuang.hellominecraft.launcher.util.MinecraftCrashAdvicer;
 import org.jackhuang.hellominecraft.util.C;
-import org.jackhuang.hellominecraft.util.Event;
 import org.jackhuang.hellominecraft.util.MessageBox;
 import org.jackhuang.hellominecraft.util.func.Consumer;
 import org.jackhuang.hellominecraft.util.log.HMCLog;
@@ -43,118 +48,127 @@ import org.jackhuang.hellominecraft.util.net.WebFrame;
  */
 public class LaunchingUIDaemon {
 
-    Runnable customizedSuccessEvent = null;
-
-    void runGame(Profile profile) {
-        MainFrame.INSTANCE.showMessage(C.i18n("ui.message.launching"));
-        profile.launcher().genLaunchCode(value -> {
-            value.launchingStateChangedEvent.register(LAUNCHING_STATE_CHANGED);
-            value.successEvent.register(LAUNCH_FINISHER);
-            value.successEvent.register(customizedSuccessEvent);
-        }, MainFrame.INSTANCE::failed, Settings.getInstance().getAuthenticator().getPassword());
-    }
-
-    void makeLaunchScript(Profile profile) {
-        MainFrame.INSTANCE.showMessage(C.i18n("ui.message.launching"));
-        profile.launcher().genLaunchCode(value -> {
-            value.launchingStateChangedEvent.register(LAUNCHING_STATE_CHANGED);
-            value.successEvent.register(LAUNCH_SCRIPT_FINISHER);
-            value.successEvent.register(customizedSuccessEvent);
-        }, MainFrame.INSTANCE::failed, Settings.getInstance().getAuthenticator().getPassword());
-    }
-
-    private static final Consumer<LaunchingState> LAUNCHING_STATE_CHANGED = t -> {
-        String message = null;
-        switch (t) {
-        case LoggingIn:
-            message = "launch.state.logging_in";
-            break;
-        case GeneratingLaunchingCodes:
-            message = "launch.state.generating_launching_codes";
-            break;
-        case DownloadingLibraries:
-            message = "launch.state.downloading_libraries";
-            break;
-        case DecompressingNatives:
-            message = "launch.state.decompressing_natives";
-            break;
-        }
-        MainFrame.INSTANCE.showMessage(C.i18n(message));
-    };
-
-    private static final Event<List<String>> LAUNCH_FINISHER = (sender, str) -> {
-        final GameLauncher obj = (GameLauncher) sender;
-        obj.launchEvent.register(p -> {
-            if ((LauncherVisibility) obj.getTag() == LauncherVisibility.CLOSE && !LogWindow.INSTANCE.isVisible()) {
+    public LaunchingUIDaemon() {
+        HMCLAPI.EVENT_BUS.channel(LaunchingStateChangedEvent.class).register(LAUNCHING_STATE_CHANGED);
+        HMCLAPI.EVENT_BUS.channel(LaunchEvent.class).register(p -> {
+            GameLauncher obj = (GameLauncher) p.getSource();
+            HMCLGameLauncher.GameLauncherTag tag = (HMCLGameLauncher.GameLauncherTag) obj.getTag();
+            if (tag.launcherVisibility == LauncherVisibility.CLOSE && !LogWindow.INSTANCE.isVisible()) {
                 HMCLog.log("Without the option of keeping the launcher visible, this application will exit and will NOT catch game logs, but you can turn on \"Debug Mode\".");
                 System.exit(0);
-            } else if ((LauncherVisibility) obj.getTag() == LauncherVisibility.KEEP)
+            } else if (tag.launcherVisibility == LauncherVisibility.KEEP)
                 MainFrame.INSTANCE.closeMessage();
             else {
                 if (LogWindow.INSTANCE.isVisible())
                     LogWindow.INSTANCE.setExit(() -> true);
                 MainFrame.INSTANCE.dispose();
             }
-            JavaProcessMonitor jpm = new JavaProcessMonitor(p);
-            jpm.applicationExitedAbnormallyEvent.register(t -> {
-                HMCLog.err("The game exited abnormally, exit code: " + t);
-                String[] logs = jpm.getJavaProcess().getStdOutLines().toArray(new String[0]);
-                String errorText = null;
-                for (String s : logs) {
-                    int pos = s.lastIndexOf("#@!@#");
-                    if (pos >= 0 && pos < s.length() - "#@!@#".length() - 1) {
-                        errorText = s.substring(pos + "#@!@#".length()).trim();
-                        break;
-                    }
-                }
-                String msg = C.i18n("launch.exited_abnormally") + " exit code: " + t;
-                if (errorText != null)
-                    msg += ", advice: " + MinecraftCrashAdvicer.getAdvice(FileUtils.readQuietly(new File(errorText)));
-                WebFrame f = new WebFrame(logs);
-                f.setModal(true);
-                f.setTitle(msg);
-                f.setVisible(true);
-                checkExit((LauncherVisibility) obj.getTag());
-            });
-            jpm.jvmLaunchFailedEvent.register(t -> {
-                HMCLog.err("Cannot create jvm, exit code: " + t);
-                WebFrame f = new WebFrame(jpm.getJavaProcess().getStdOutLines().toArray(new String[0]));
-                f.setModal(true);
-                f.setTitle(C.i18n("launch.cannot_create_jvm") + " exit code: " + t);
-                f.setVisible(true);
-                checkExit((LauncherVisibility) obj.getTag());
-            });
-            jpm.stoppedEvent.register(() -> checkExit((LauncherVisibility) obj.getTag()));
-            jpm.start();
+            // We promise that JavaProcessMonitor.tag is LauncherVisibility
+            // See events below.
+            JavaProcessMonitor monitor = new JavaProcessMonitor(p.getValue());
+            monitor.setTag(tag.launcherVisibility);
+            monitor.start();
         });
+        HMCLAPI.EVENT_BUS.channel(LaunchSucceededEvent.class).register(p -> {
+            int state = ((HMCLGameLauncher.GameLauncherTag) ((GameLauncher) p.getSource()).getTag()).state;
+            if (state == 1)
+                LAUNCH_FINISHER.accept(p);
+            else if (state == 2)
+                LAUNCH_SCRIPT_FINISHER.accept(p);
+        });
+        HMCLAPI.EVENT_BUS.channel(JavaProcessStoppedEvent.class).register(event -> checkExit((LauncherVisibility) ((JavaProcessMonitor) event.getSource()).getTag()));
+        HMCLAPI.EVENT_BUS.channel(JavaProcessExitedAbnormallyEvent.class).register(event -> {
+            int exitCode = event.getValue().getExitCode();
+            HMCLog.err("The game exited abnormally, exit code: " + exitCode);
+            String[] logs = event.getValue().getStdOutLines().toArray(new String[0]);
+            String errorText = null;
+            for (String s : logs) {
+                int pos = s.lastIndexOf("#@!@#");
+                if (pos >= 0 && pos < s.length() - "#@!@#".length() - 1) {
+                    errorText = s.substring(pos + "#@!@#".length()).trim();
+                    break;
+                }
+            }
+            String msg = C.i18n("launch.exited_abnormally") + " exit code: " + exitCode;
+            if (errorText != null)
+                msg += ", advice: " + MinecraftCrashAdvicer.getAdvice(FileUtils.readQuietly(new File(errorText)));
+            WebFrame f = new WebFrame(logs);
+            f.setModal(true);
+            f.setTitle(msg);
+            f.setVisible(true);
+            checkExit((LauncherVisibility) ((JavaProcessMonitor) event.getSource()).getTag());
+        });
+        HMCLAPI.EVENT_BUS.channel(JVMLaunchFailedEvent.class).register(event -> {
+            int exitCode = event.getValue().getExitCode();
+            HMCLog.err("Cannot create jvm, exit code: " + exitCode);
+            WebFrame f = new WebFrame(event.getValue().getStdOutLines().toArray(new String[0]));
+            f.setModal(true);
+            f.setTitle(C.i18n("launch.cannot_create_jvm") + " exit code: " + exitCode);
+            f.setVisible(true);
+            checkExit((LauncherVisibility) ((JavaProcessMonitor) event.getSource()).getTag());
+        });
+    }
+
+    void runGame(Profile profile) {
+        MainFrame.INSTANCE.showMessage(C.i18n("ui.message.launching"));
+        profile.launcher().genLaunchCode(value -> {
+            ((HMCLGameLauncher.GameLauncherTag) value.getTag()).state = 1;
+        }, MainFrame.INSTANCE::failed, Settings.getInstance().getAuthenticator().getPassword());
+    }
+
+    void makeLaunchScript(Profile profile) {
+        MainFrame.INSTANCE.showMessage(C.i18n("ui.message.launching"));
+        profile.launcher().genLaunchCode(value -> {
+            ((HMCLGameLauncher.GameLauncherTag) value.getTag()).state = 2;
+        }, MainFrame.INSTANCE::failed, Settings.getInstance().getAuthenticator().getPassword());
+    }
+
+    private static final Consumer<LaunchingStateChangedEvent> LAUNCHING_STATE_CHANGED = t -> {
+        String message = null;
+        switch (t.getValue()) {
+            case LoggingIn:
+                message = "launch.state.logging_in";
+                break;
+            case GeneratingLaunchingCodes:
+                message = "launch.state.generating_launching_codes";
+                break;
+            case DownloadingLibraries:
+                message = "launch.state.downloading_libraries";
+                break;
+            case DecompressingNatives:
+                message = "launch.state.decompressing_natives";
+                break;
+        }
+        MainFrame.INSTANCE.showMessage(C.i18n(message));
+    };
+
+    private static final Consumer<LaunchSucceededEvent> LAUNCH_FINISHER = event -> {
         try {
-            obj.launch(str);
+            ((GameLauncher) event.getSource()).launch(event.getValue());
         } catch (IOException e) {
             MainFrame.INSTANCE.failed(C.i18n("launch.failed_creating_process") + "\n" + e.getMessage());
             HMCLog.err("Failed to launch when creating a new process.", e);
         }
-        return true;
     };
 
     private static void checkExit(LauncherVisibility v) {
         if (v != LauncherVisibility.KEEP && !LogWindow.INSTANCE.isVisible()) {
             HMCLog.log("Launcher will exit now.");
             System.exit(0);
+        } else {
+            HMCLog.log("Launcher will not exit now.");
         }
     }
 
-    private static final Event<List<String>> LAUNCH_SCRIPT_FINISHER = (sender, str) -> {
-        boolean flag = false;
+    private static final Consumer<LaunchSucceededEvent> LAUNCH_SCRIPT_FINISHER = event -> {
         try {
             String s = JOptionPane.showInputDialog(C.i18n("mainwindow.enter_script_name"));
             if (s != null)
-                MessageBox.show(C.i18n("mainwindow.make_launch_succeed") + " " + ((GameLauncher) sender).makeLauncher(s, str).getAbsolutePath());
-            flag = true;
+                MessageBox.show(C.i18n("mainwindow.make_launch_succeed") + " " + ((GameLauncher) event.getSource()).makeLauncher(s, event.getValue()).getAbsolutePath());
         } catch (IOException ex) {
             MessageBox.show(C.i18n("mainwindow.make_launch_script_failed"));
             HMCLog.err("Failed to create script file.", ex);
         }
         MainFrame.INSTANCE.closeMessage();
-        return flag;
     };
 }
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/MainFrame.java b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/MainFrame.java
index 766a4fe9d..3c23d4db2 100755
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/MainFrame.java
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/MainFrame.java
@@ -17,6 +17,7 @@
  */
 package org.jackhuang.hellominecraft.launcher.ui;
 
+import org.jackhuang.hellominecraft.util.ui.Page;
 import org.jackhuang.hellominecraft.util.ui.GaussionPanel;
 import org.jackhuang.hellominecraft.util.ui.IRepaint;
 import java.awt.BorderLayout;
@@ -50,7 +51,10 @@ import javax.swing.JComponent;
 import javax.swing.JLabel;
 import javax.swing.JPanel;
 import javax.swing.SwingUtilities;
+import org.jackhuang.hellominecraft.api.HMCLAPI;
 import org.jackhuang.hellominecraft.launcher.Main;
+import org.jackhuang.hellominecraft.launcher.api.PluginManager;
+import org.jackhuang.hellominecraft.launcher.api.event.config.ThemeChangedEvent;
 import org.jackhuang.hellominecraft.launcher.core.auth.IAuthenticator;
 import org.jackhuang.hellominecraft.launcher.setting.Settings;
 import org.jackhuang.hellominecraft.lookandfeel.Theme;
@@ -155,7 +159,7 @@ public final class MainFrame extends DraggableFrame implements IRepaint {
             }
         ((JPanel) getContentPane()).setOpaque(true);
 
-        Settings.getInstance().themeChangedEvent.register(this::reloadColor);
+        HMCLAPI.EVENT_BUS.channel(ThemeChangedEvent.class).register(x -> reloadColor(x.getValue()));
 
         SwingUtilities.invokeLater(() -> selectTab("main"));
     }
@@ -185,9 +189,7 @@ public final class MainFrame extends DraggableFrame implements IRepaint {
 
         header.add(Box.createRigidArea(new Dimension(8, 0)));
 
-        initializeTab(new MainPagePanel(), "main");
-        initializeTab(new GameSettingsPanel(this), "game");
-        initializeTab(new LauncherSettingsPanel(), "launcher");
+        PluginManager.fireAddTab(this, this::initializeTab);
 
         header.add(Box.createHorizontalGlue());
 
@@ -258,8 +260,8 @@ public final class MainFrame extends DraggableFrame implements IRepaint {
 
     private transient final ActionListener tabListener = e -> MainFrame.this.selectTab(e.getActionCommand());
 
-    private void initializeTab(Page inst, String cmd) {
-        HeaderTab tab = new HeaderTab(C.i18n("launcher.title." + cmd));
+    private void initializeTab(Page inst, String cmd, String title) {
+        HeaderTab tab = new HeaderTab(title);
         tab.setActionCommand(cmd);
         tab.setForeground(BasicColors.COLOR_WHITE_TEXT);
         tab.setBackground(borderColorDarker);
@@ -489,9 +491,4 @@ public final class MainFrame extends DraggableFrame implements IRepaint {
     }
 
     transient LaunchingUIDaemon daemon = new LaunchingUIDaemon();
-    transient final HashMap<String, Runnable> actions = new HashMap<>();
-    void invokeAction(String name) {
-        if (actions.containsKey(name))
-            actions.get(name).run();
-    }
 }
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/MainPagePanel.java b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/MainPagePanel.java
index cce20f7f5..526a82852 100755
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/MainPagePanel.java
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/MainPagePanel.java
@@ -17,6 +17,7 @@
  */
 package org.jackhuang.hellominecraft.launcher.ui;
 
+import org.jackhuang.hellominecraft.util.ui.Page;
 import org.jackhuang.hellominecraft.util.ui.WideComboBox;
 import org.jackhuang.hellominecraft.util.ui.GaussionPanel;
 import java.awt.CardLayout;
@@ -28,18 +29,22 @@ import javax.swing.DefaultComboBoxModel;
 import javax.swing.JOptionPane;
 import javax.swing.SwingUtilities;
 import javax.swing.filechooser.FileNameExtensionFilter;
+import org.jackhuang.hellominecraft.api.HMCLAPI;
+import org.jackhuang.hellominecraft.launcher.api.event.config.AuthenticatorChangedEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.config.ProfileChangedEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.config.ProfileLoadingEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.LaunchSucceededEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.LaunchingState;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.LaunchingStateChangedEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.version.RefreshedVersionsEvent;
 import org.jackhuang.hellominecraft.util.C;
 import org.jackhuang.hellominecraft.launcher.core.auth.IAuthenticator;
 import org.jackhuang.hellominecraft.launcher.setting.Profile;
-import org.jackhuang.hellominecraft.util.MessageBox;
 import org.jackhuang.hellominecraft.util.StrUtils;
 import org.jackhuang.hellominecraft.launcher.core.version.MinecraftVersion;
 import org.jackhuang.hellominecraft.launcher.setting.Settings;
 import org.jackhuang.hellominecraft.launcher.core.mod.ModpackManager;
-import org.jackhuang.hellominecraft.launcher.core.service.IMinecraftService;
 import org.jackhuang.hellominecraft.launcher.ui.modpack.ModpackWizard;
-import org.jackhuang.hellominecraft.launcher.util.HMCLMinecraftService;
-import org.jackhuang.hellominecraft.util.Event;
 import org.jackhuang.hellominecraft.lookandfeel.ConstomButton;
 import org.jackhuang.hellominecraft.util.func.Consumer;
 import org.jackhuang.hellominecraft.util.sys.FileUtils;
@@ -60,7 +65,7 @@ public class MainPagePanel extends Page {
 
     void initGui() {
         initComponents();
-        
+
         animationEnabled = false;
 
         pnlButtons = new javax.swing.JPanel();
@@ -86,19 +91,20 @@ public class MainPagePanel extends Page {
         pnlMore.setBackground(GraphicsUtils.getWebColorWithAlpha("FFFFFF7F"));
         pnlMore.setOpaque(true);
 
-        Settings.getInstance().authChangedEvent.register(onAuthChanged);
-        Settings.profileLoadingEvent.register(onLoadingProfiles);
-        Settings.profileChangedEvent.register(onSelectedProfilesChanged);
-
-        MainFrame.INSTANCE.daemon.customizedSuccessEvent = this::prepareAuths;
-
-        prepareAuths();
-
         if (Settings.getInstance().isEnableBlur())
             ((GaussionPanel) pnlRoot).addAeroObject(pnlMore);
         ((GaussionPanel) pnlRoot).setBackgroundImage(MainFrame.INSTANCE.background.getImage());
 
         ((RepaintPage) pnlMore).setRepainter(pnlRoot);
+
+        HMCLAPI.EVENT_BUS.channel(AuthenticatorChangedEvent.class).register(onAuthChanged);
+        HMCLAPI.EVENT_BUS.channel(ProfileLoadingEvent.class).register(onLoadingProfiles);
+        HMCLAPI.EVENT_BUS.channel(ProfileChangedEvent.class).register(onSelectedProfilesChanged);
+        HMCLAPI.EVENT_BUS.channel(RefreshedVersionsEvent.class).register(onRefreshedVersions);
+        HMCLAPI.EVENT_BUS.channel(LaunchingStateChangedEvent.class).register(launchingStateChanged);
+        HMCLAPI.EVENT_BUS.channel(LaunchSucceededEvent.class).register(this::prepareAuths);
+
+        prepareAuths();
     }
 
     /**
@@ -409,7 +415,6 @@ public class MainPagePanel extends Page {
     }//GEN-LAST:event_txtPasswordCaretUpdate
 
     // <editor-fold defaultstate="collapsed" desc="Loads">
-    
     private void prepareAuths() {
         preparingAuth = true;
         cboLoginMode.removeAllItems();
@@ -460,8 +465,8 @@ public class MainPagePanel extends Page {
     private javax.swing.JTextField txtPlayerName;
     // End of variables declaration//GEN-END:variables
 
-    final Event<IAuthenticator> onAuthChanged = (sender, l) -> {
-        if (l.hasPassword()) {
+    final Consumer<AuthenticatorChangedEvent> onAuthChanged = (x) -> {
+        if (x.getValue().hasPassword()) {
             pnlPassword.setVisible(true);
             lblUserName.setText(C.i18n("login.account"));
         } else {
@@ -470,16 +475,14 @@ public class MainPagePanel extends Page {
         }
 
         CardLayout cl = (CardLayout) pnlPassword.getLayout();
-        if (l.isLoggedIn())
+        if (x.getValue().isLoggedIn())
             cl.last(pnlPassword);
         else
             cl.first(pnlPassword);
-        String username = l.getUserName();
+        String username = x.getValue().getUserName();
         if (username == null)
             username = "";
         txtPlayerName.setText(username);
-
-        return true;
     };
 
     final Runnable onLoadingProfiles = () -> {
@@ -491,8 +494,8 @@ public class MainPagePanel extends Page {
         isLoading = false;
     };
 
-    final Consumer<IMinecraftService> onRefreshedVersions = t -> {
-        if (Settings.getLastProfile().service() == t)
+    final Consumer<RefreshedVersionsEvent> onRefreshedVersions = t -> {
+        if (Settings.getLastProfile().service() == t.getValue())
             loadVersions();
     };
 
@@ -502,28 +505,18 @@ public class MainPagePanel extends Page {
         isLoading = true;
         cboVersions.removeAllItems();
         String selVersion = Settings.getLastProfile().getSelectedVersion();
-        if (Settings.getLastProfile().service().version().getVersions().isEmpty()) {
-            if (!showedNoVersion && ((HMCLMinecraftService) Settings.getLastProfile().service()).checkedModpack) {
-                showedNoVersion = true;
-                SwingUtilities.invokeLater(() -> {
-                    if (MessageBox.show(C.i18n("mainwindow.no_version"), MessageBox.YES_NO_OPTION) == MessageBox.YES_OPTION)
-                        MainFrame.INSTANCE.invokeAction("showGameDownloads");
-                });
-            }
-        } else {
+        if (!Settings.getLastProfile().service().version().getVersions().isEmpty()) {
             for (MinecraftVersion mcVersion : Settings.getLastProfile().service().version().getVersions()) {
                 if (mcVersion.hidden)
                     continue;
                 cboVersions.addItem(mcVersion.id);
             }
-            versionChanged.accept(selVersion);
+            versionChanged(selVersion);
         }
         isLoading = false;
     }
 
-    final Consumer<Boolean> launchingStateChanged = t -> SwingUtils.setEnabled(MainFrame.INSTANCE.getRootPane(), !t);
-
-    final Consumer<String> versionChanged = this::versionChanged;
+    final Consumer<LaunchingStateChangedEvent> launchingStateChanged = t -> SwingUtils.setEnabled(MainFrame.INSTANCE.getRootPane(), t.getValue() == LaunchingState.Done);
 
     void versionChanged(String selectedVersion) {
         isLoading = true;
@@ -536,10 +529,12 @@ public class MainPagePanel extends Page {
         isLoading = false;
     }
 
-    final Consumer<Profile> onSelectedProfilesChanged = t -> {
-        t.service().version().onRefreshedVersions.register(onRefreshedVersions);
-        t.selectedVersionChangedEvent.register(versionChanged);
-        t.launcher().launchingStateChanged.register(launchingStateChanged);
+    final Consumer<ProfileChangedEvent> onSelectedProfilesChanged = event -> {
+        Profile t = Settings.getProfile(event.getValue());
+        t.propertyChanged.register(e -> {
+            if ("selectedMinecraftVersion".equals(e.getPropertyName()))
+                versionChanged(e.getNewValue());
+        });
 
         isLoading = true;
         DefaultComboBoxModel<String> model = (DefaultComboBoxModel<String>) cboProfiles.getModel();
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/NewTabPane.java b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/NewTabPane.java
index 62f44bdf8..6d1638215 100755
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/NewTabPane.java
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/NewTabPane.java
@@ -17,6 +17,7 @@
  */
 package org.jackhuang.hellominecraft.launcher.ui;
 
+import org.jackhuang.hellominecraft.util.ui.Selectable;
 import javax.swing.JTabbedPane;
 import javax.swing.event.ChangeEvent;
 import javax.swing.event.ChangeListener;
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/RepaintPage.java b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/RepaintPage.java
index c376e526f..de85907b6 100644
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/RepaintPage.java
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/RepaintPage.java
@@ -17,6 +17,7 @@
  */
 package org.jackhuang.hellominecraft.launcher.ui;
 
+import org.jackhuang.hellominecraft.util.ui.Page;
 import org.jackhuang.hellominecraft.util.ui.IRepaint;
 import java.awt.Rectangle;
 import java.awt.Window;
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/DefaultPlugin.java b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/DefaultPlugin.java
index 7a7ccf9a5..4ea8d8536 100755
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/DefaultPlugin.java
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/DefaultPlugin.java
@@ -18,17 +18,19 @@
 package org.jackhuang.hellominecraft.launcher.util;
 
 import java.util.ArrayList;
+import javax.swing.JFrame;
+import org.jackhuang.hellominecraft.launcher.api.AddTabCallback;
 import org.jackhuang.hellominecraft.launcher.core.service.IMinecraftService;
 import org.jackhuang.hellominecraft.launcher.api.IPlugin;
 import org.jackhuang.hellominecraft.launcher.core.auth.IAuthenticator;
 import org.jackhuang.hellominecraft.launcher.core.auth.OfflineAuthenticator;
-import org.jackhuang.hellominecraft.launcher.core.auth.UserProfileProvider;
 import org.jackhuang.hellominecraft.launcher.core.auth.YggdrasilAuthenticator;
-import org.jackhuang.hellominecraft.launcher.core.launch.LaunchOptions;
 import org.jackhuang.hellominecraft.launcher.setting.Profile;
 import org.jackhuang.hellominecraft.launcher.setting.Settings;
-import org.jackhuang.hellominecraft.launcher.ui.MainFrame;
-import org.jackhuang.hellominecraft.util.EventHandler;
+import org.jackhuang.hellominecraft.launcher.ui.GameSettingsPanel;
+import org.jackhuang.hellominecraft.launcher.ui.LauncherSettingsPanel;
+import org.jackhuang.hellominecraft.launcher.ui.MainPagePanel;
+import org.jackhuang.hellominecraft.util.C;
 import org.jackhuang.hellominecraft.util.func.Consumer;
 
 /**
@@ -39,11 +41,6 @@ public class DefaultPlugin implements IPlugin {
 
     ArrayList<IAuthenticator> auths = new ArrayList<>();
 
-    @Override
-    public IMinecraftService provideMinecraftService(Object profile) {
-        return new HMCLMinecraftService((Profile) profile);
-    }
-
     @Override
     public void onRegisterAuthenticators(Consumer<IAuthenticator> apply) {
         String clientToken = Settings.getInstance().getClientToken();
@@ -64,19 +61,10 @@ public class DefaultPlugin implements IPlugin {
     }
 
     @Override
-    public void showUI() {
-        MainFrame.showMainFrame();
-    }
-
-    @Override
-    public void onProcessingLoginResult(UserProfileProvider result) {
-    }
-
-    public transient final EventHandler<LaunchOptions> onProcessingLaunchOptionsEvent = new EventHandler<>(this);
-
-    @Override
-    public void onProcessingLaunchOptions(LaunchOptions p) {
-        onProcessingLaunchOptionsEvent.execute(p);
+    public void onAddTab(JFrame frame, AddTabCallback callback) {
+        callback.addTab(new MainPagePanel(), "main", C.i18n("launcher.title.main"));
+        callback.addTab(new GameSettingsPanel(), "game", C.i18n("launcher.title.game"));
+        callback.addTab(new LauncherSettingsPanel(), "launcher", C.i18n("launcher.title.launcher"));
     }
 
 }
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/HMCLGameLauncher.java b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/HMCLGameLauncher.java
index 71588aa10..89b4cffb8 100644
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/HMCLGameLauncher.java
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/HMCLGameLauncher.java
@@ -18,7 +18,6 @@
 package org.jackhuang.hellominecraft.launcher.util;
 
 import java.io.File;
-import org.jackhuang.hellominecraft.launcher.api.PluginManager;
 import org.jackhuang.hellominecraft.launcher.core.GameException;
 import org.jackhuang.hellominecraft.launcher.core.auth.AuthenticationException;
 import org.jackhuang.hellominecraft.launcher.core.auth.IAuthenticator;
@@ -29,9 +28,15 @@ import org.jackhuang.hellominecraft.launcher.core.launch.LaunchOptions;
 import org.jackhuang.hellominecraft.launcher.setting.Profile;
 import org.jackhuang.hellominecraft.launcher.setting.Settings;
 import org.jackhuang.hellominecraft.util.C;
-import org.jackhuang.hellominecraft.util.EventHandler;
+import org.jackhuang.hellominecraft.api.HMCLAPI;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.LaunchSucceededEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.LaunchingState;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.LaunchingStateChangedEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.launch.ProcessingLaunchOptionsEvent;
+import org.jackhuang.hellominecraft.launcher.core.RuntimeGameException;
 import org.jackhuang.hellominecraft.util.func.Consumer;
 import org.jackhuang.hellominecraft.util.log.HMCLog;
+import org.jackhuang.hellominecraft.util.sys.JavaProcess;
 
 /**
  *
@@ -42,15 +47,15 @@ public class HMCLGameLauncher {
     Profile profile;
     boolean isLaunching = false;
 
-    public final EventHandler<Boolean> launchingStateChanged = new EventHandler<>(this);
-
     public HMCLGameLauncher(Profile p) {
         this.profile = p;
+        
+        HMCLAPI.EVENT_BUS.channel(LaunchSucceededEvent.class).register(() -> setLaunching(false));
     }
 
     void setLaunching(boolean isLaunching) {
         if (isLaunching != this.isLaunching)
-            launchingStateChanged.execute(isLaunching);
+            HMCLAPI.EVENT_BUS.fireChannel(new LaunchingStateChangedEvent(this, isLaunching ? LaunchingState.Starting : LaunchingState.Done));
         this.isLaunching = isLaunching;
     }
 
@@ -80,13 +85,14 @@ public class HMCLGameLauncher {
                 Thread.currentThread().setName("Game Launcher");
                 try {
                     LaunchOptions options = profile.getSelectedVersionSetting().createLaunchOptions(profile.getCanonicalGameDirFile());
-                    PluginManager.plugin().onProcessingLaunchOptions(options);
+                    HMCLAPI.EVENT_BUS.fireChannel(new ProcessingLaunchOptionsEvent(this, options));
                     DefaultGameLauncher gl = new DefaultGameLauncher(options, profile.service(), li, l);
-                    gl.setTag(profile.getSelectedVersionSetting().getLauncherVisibility());
-                    gl.successEvent.register(() -> setLaunching(false));
+                    GameLauncherTag tag = new GameLauncherTag();
+                    tag.launcherVisibility = profile.getSelectedVersionSetting().getLauncherVisibility();
+                    gl.setTag(tag);
                     listener.accept(gl);
                     gl.makeLaunchCommand();
-                } catch (GameException e) {
+                } catch (GameException | RuntimeGameException e) {
                     failed.accept(C.i18n("launch.failed") + ", " + e.getMessage());
                     setLaunching(false);
                 } catch (AuthenticationException e) {
@@ -99,4 +105,9 @@ public class HMCLGameLauncher {
         t.start();
     }
 
+    public static class GameLauncherTag {
+        public LauncherVisibility launcherVisibility;
+        public JavaProcess process;
+        public int state; // 0 - unknown; 1 - launch; 2 - make launch script.
+    }
 }
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/HMCLMinecraftService.java b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/HMCLMinecraftService.java
index e5a6e8175..329e0d542 100644
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/HMCLMinecraftService.java
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/HMCLMinecraftService.java
@@ -22,6 +22,10 @@ import java.io.File;
 import java.util.HashMap;
 import java.util.Map;
 import javax.swing.SwingUtilities;
+import org.jackhuang.hellominecraft.api.HMCLAPI;
+import org.jackhuang.hellominecraft.launcher.api.event.version.LoadedOneVersionEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.version.RefreshedVersionsEvent;
+import org.jackhuang.hellominecraft.launcher.api.event.version.RefreshingVersionsEvent;
 import org.jackhuang.hellominecraft.launcher.core.GameException;
 import org.jackhuang.hellominecraft.launcher.core.install.MinecraftInstallerService;
 import org.jackhuang.hellominecraft.launcher.core.asset.MinecraftAssetService;
@@ -53,8 +57,8 @@ public class HMCLMinecraftService extends IMinecraftService {
         this.p = p;
         this.provider = new HMCLGameProvider(this);
         provider.initializeMiencraft();
-        provider.onRefreshingVersions.register(versionSettings::clear);
-        provider.onRefreshedVersions.register(() -> {
+        HMCLAPI.EVENT_BUS.channel(RefreshingVersionsEvent.class).register(versionSettings::clear);
+        HMCLAPI.EVENT_BUS.channel(RefreshedVersionsEvent.class).registerFirst(() -> {
             if (!checkingModpack) {
                 checkingModpack = true;
                 if (version().getVersionCount() == 0) {
@@ -68,7 +72,7 @@ public class HMCLMinecraftService extends IMinecraftService {
                 }
             }
         });
-        provider.onLoadedVersion.register(this::loadVersionSetting);
+        HMCLAPI.EVENT_BUS.channel(LoadedOneVersionEvent.class).register(e -> loadVersionSetting(e.getValue()));
         this.mms = new MinecraftModService(this);
         this.mds = new MinecraftDownloadService(this);
         this.mas = new MinecraftAssetService(this);
@@ -105,10 +109,7 @@ public class HMCLMinecraftService extends IMinecraftService {
 
     private void initVersionSetting(String id, VersionSetting vs) {
         vs.id = id;
-        vs.propertyChanged.register((sender, t) -> {
-            saveVersionSetting(((VersionSetting) sender).id);
-            return true;
-        });
+        vs.propertyChanged.register(event -> saveVersionSetting(((VersionSetting) event.getSource()).id));
         versionSettings.put(id, vs);
     }
 
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/upgrade/AppDataUpgrader.java b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/upgrade/AppDataUpgrader.java
index 67132f855..30a15fa27 100755
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/upgrade/AppDataUpgrader.java
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/upgrade/AppDataUpgrader.java
@@ -34,6 +34,7 @@ import java.util.jar.JarFile;
 import java.util.jar.JarOutputStream;
 import java.util.jar.Pack200;
 import java.util.zip.GZIPInputStream;
+import org.jackhuang.hellominecraft.api.SimpleEvent;
 import org.jackhuang.hellominecraft.util.C;
 import org.jackhuang.hellominecraft.util.log.HMCLog;
 import org.jackhuang.hellominecraft.launcher.core.MCUtils;
@@ -97,9 +98,10 @@ public class AppDataUpgrader extends IUpgrader {
     }
 
     @Override
-    public boolean call(Object sender, final VersionNumber number) {
-        ((UpdateChecker) sender).requestDownloadLink().reg(map -> {
-            if (MessageBox.show(C.i18n("update.newest_version") + number.firstVer + "." + number.secondVer + "." + number.thirdVer + "\n"
+    public void accept(SimpleEvent<VersionNumber> event) {
+        final VersionNumber version = event.getValue();
+        ((UpdateChecker) event.getSource()).requestDownloadLink().reg(map -> {
+            if (MessageBox.show(C.i18n("update.newest_version") + version.firstVer + "." + version.secondVer + "." + version.thirdVer + "\n"
                                 + C.i18n("update.should_open_link"),
                                 MessageBox.YES_NO_OPTION) == MessageBox.YES_OPTION)
                 if (map != null && map.containsKey("pack"))
@@ -107,8 +109,8 @@ public class AppDataUpgrader extends IUpgrader {
                         String hash = null;
                         if (map.containsKey("packsha1"))
                             hash = map.get("packsha1");
-                        if (TaskWindow.factory().append(new AppDataUpgraderTask(map.get("pack"), number.version, hash)).execute()) {
-                            new ProcessBuilder(new String[] { IOUtils.getJavaDir(), "-jar", AppDataUpgraderTask.getSelf(number.version).getAbsolutePath() }).directory(new File(".")).start();
+                        if (TaskWindow.factory().append(new AppDataUpgraderTask(map.get("pack"), version.version, hash)).execute()) {
+                            new ProcessBuilder(new String[] { IOUtils.getJavaDir(), "-jar", AppDataUpgraderTask.getSelf(version.version).getAbsolutePath() }).directory(new File(".")).start();
                             System.exit(0);
                         }
                     } catch (IOException ex) {
@@ -132,7 +134,6 @@ public class AppDataUpgrader extends IUpgrader {
                     }
                 }
         }).execute();
-        return true;
     }
 
     public static class AppDataUpgraderTask extends Task {
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/upgrade/IUpgrader.java b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/upgrade/IUpgrader.java
index 5c774610d..d32656024 100755
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/upgrade/IUpgrader.java
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/upgrade/IUpgrader.java
@@ -17,14 +17,15 @@
  */
 package org.jackhuang.hellominecraft.launcher.util.upgrade;
 
-import org.jackhuang.hellominecraft.util.Event;
+import org.jackhuang.hellominecraft.api.SimpleEvent;
 import org.jackhuang.hellominecraft.util.VersionNumber;
+import org.jackhuang.hellominecraft.util.func.Consumer;
 
 /**
  *
  * @author huangyuhui
  */
-public abstract class IUpgrader implements Event<VersionNumber> {
+public abstract class IUpgrader implements Consumer<SimpleEvent<VersionNumber>> {
 
     public static final IUpgrader NOW_UPGRADER = new AppDataUpgrader();
 
@@ -48,5 +49,5 @@ public abstract class IUpgrader implements Event<VersionNumber> {
      * @return should return true
      */
     @Override
-    public abstract boolean call(Object sender, VersionNumber number);
+    public abstract void accept(SimpleEvent<VersionNumber> event);
 }
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/upgrade/NewFileUpgrader.java b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/upgrade/NewFileUpgrader.java
index ee3c7e091..ee0049f11 100755
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/upgrade/NewFileUpgrader.java
+++ b/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/util/upgrade/NewFileUpgrader.java
@@ -19,6 +19,7 @@ package org.jackhuang.hellominecraft.launcher.util.upgrade;
 
 import java.io.File;
 import java.io.IOException;
+import org.jackhuang.hellominecraft.api.SimpleEvent;
 import org.jackhuang.hellominecraft.util.log.HMCLog;
 import org.jackhuang.hellominecraft.util.task.TaskWindow;
 import org.jackhuang.hellominecraft.util.net.FileDownloadTask;
@@ -45,7 +46,7 @@ public class NewFileUpgrader extends IUpgrader {
     }
 
     @Override
-    public boolean call(Object sender, VersionNumber number) {
+    public void accept(SimpleEvent<VersionNumber> event) {
         String str = requestDownloadLink();
         File newf = new File(FileUtils.getName(str));
         if (TaskWindow.factory().append(new FileDownloadTask(str, newf)).execute()) {
@@ -56,7 +57,6 @@ public class NewFileUpgrader extends IUpgrader {
             }
             System.exit(0);
         }
-        return true;
     }
 
     private String requestDownloadLink() {
diff --git a/HMCSM/src/main/java/org/jackhuang/hellominecraft/svrmgr/server/Server.java b/HMCSM/src/main/java/org/jackhuang/hellominecraft/svrmgr/server/Server.java
index 8183bb3b4..35e2b7107 100755
--- a/HMCSM/src/main/java/org/jackhuang/hellominecraft/svrmgr/server/Server.java
+++ b/HMCSM/src/main/java/org/jackhuang/hellominecraft/svrmgr/server/Server.java
@@ -44,8 +44,8 @@ import org.jackhuang.hellominecraft.svrmgr.setting.SettingsManager;
 import org.jackhuang.hellominecraft.svrmgr.util.MonitorThread;
 import org.jackhuang.hellominecraft.svrmgr.util.WaitForThread;
 import org.jackhuang.hellominecraft.svrmgr.util.Utilities;
-import org.jackhuang.hellominecraft.util.Event;
-import org.jackhuang.hellominecraft.util.EventHandler;
+import org.jackhuang.hellominecraft.api.Event;
+import org.jackhuang.hellominecraft.api.EventHandler;
 import org.jackhuang.hellominecraft.util.code.Charsets;
 import org.jackhuang.hellominecraft.util.func.Consumer;
 
@@ -133,7 +133,7 @@ public class Server implements Event<Integer>, MonitorThread.MonitorThreadListen
             registerThreadC(server);
             bw = new BufferedWriter(new OutputStreamWriter(server.getOutputStream(), Charsets.toCharset()));
             isRunning = true;
-            startedEvent.execute(null);
+            startedEvent.fire(null);
             sendStatus("*** 启动服务端中 ***");
         } catch (IOException ex) {
             Logger.getLogger(Server.class.getName()).log(Level.SEVERE, null, ex);
@@ -342,7 +342,7 @@ public class Server implements Event<Integer>, MonitorThread.MonitorThreadListen
             Pattern p = Pattern.compile("\\[INFO\\] Done \\([0-9]*\\.[0-9]*s\\)! For help, type \"help\" or \"\\?\"");
             Matcher m = p.matcher(status);
             if (m.find()) {
-                stoppedEvent.execute(null);
+                stoppedEvent.fire(null);
                 timer = new Timer();
                 timerTasks.clear();
                 for (int i = 0; i < schedules.size(); i++) {
diff --git a/HMCSM/src/main/java/org/jackhuang/hellominecraft/svrmgr/ui/MainWindow.java b/HMCSM/src/main/java/org/jackhuang/hellominecraft/svrmgr/ui/MainWindow.java
index e4553ace2..bde00466e 100755
--- a/HMCSM/src/main/java/org/jackhuang/hellominecraft/svrmgr/ui/MainWindow.java
+++ b/HMCSM/src/main/java/org/jackhuang/hellominecraft/svrmgr/ui/MainWindow.java
@@ -87,7 +87,7 @@ import org.jackhuang.hellominecraft.svrmgr.util.Utilities;
 import org.jackhuang.hellominecraft.util.ui.SwingUtils;
 import org.jackhuang.hellominecraft.svrmgr.util.version.MinecraftRemoteVersion;
 import org.jackhuang.hellominecraft.lookandfeel.ConstomButton;
-import org.jackhuang.hellominecraft.util.Event;
+import org.jackhuang.hellominecraft.api.Event;
 import org.jackhuang.hellominecraft.util.StrUtils;
 
 /**
diff --git a/HMCSM/src/main/java/org/jackhuang/hellominecraft/svrmgr/util/WaitForThread.java b/HMCSM/src/main/java/org/jackhuang/hellominecraft/svrmgr/util/WaitForThread.java
index ab3b211d6..d9f50dab6 100755
--- a/HMCSM/src/main/java/org/jackhuang/hellominecraft/svrmgr/util/WaitForThread.java
+++ b/HMCSM/src/main/java/org/jackhuang/hellominecraft/svrmgr/util/WaitForThread.java
@@ -17,7 +17,7 @@
  */
 package org.jackhuang.hellominecraft.svrmgr.util;
 
-import org.jackhuang.hellominecraft.util.EventHandler;
+import org.jackhuang.hellominecraft.api.EventHandler;
 import org.jackhuang.hellominecraft.util.log.HMCLog;
 
 /**
@@ -37,10 +37,10 @@ public class WaitForThread extends Thread {
     public void run() {
         try {
             int exitCode = p.waitFor();
-            event.execute(exitCode);
+            event.fire(exitCode);
         } catch (InterruptedException ex) {
             HMCLog.err("Game has been interrupted.", ex);
-            event.execute(-1);
+            event.fire(-1);
         }
     }
 
diff --git a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/EventBus.java b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/EventBus.java
new file mode 100644
index 000000000..47ac1607f
--- /dev/null
+++ b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/EventBus.java
@@ -0,0 +1,48 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.api;
+
+import java.util.EventObject;
+import java.util.HashMap;
+
+/**
+ *
+ * @author huang
+ */
+public class EventBus {
+
+    HashMap<Class, EventHandler> events = new HashMap<>();
+
+    public EventBus() {
+    }
+
+    public <T extends EventObject> EventHandler<T> channel(Class<T> classOfT) {
+        if (!events.containsKey(classOfT))
+            events.put(classOfT, new EventHandler<>());
+        return events.get(classOfT);
+    }
+    
+    public void fireChannel(EventObject obj) {
+        channel((Class<EventObject>) obj.getClass()).fire(obj);
+    }
+    
+    public boolean fireChannelResulted(ResultedEvent obj) {
+        return channel((Class<ResultedEvent>) obj.getClass()).fireResulted(obj);
+    }
+    
+}
diff --git a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/EventHandler.java b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/EventHandler.java
similarity index 58%
rename from HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/EventHandler.java
rename to HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/EventHandler.java
index 8f6f3a96f..93ac760d5 100755
--- a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/EventHandler.java
+++ b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/EventHandler.java
@@ -15,9 +15,10 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see {http://www.gnu.org/licenses/}.
  */
-package org.jackhuang.hellominecraft.util;
+package org.jackhuang.hellominecraft.api;
 
 import java.util.ArrayList;
+import java.util.EventObject;
 import org.jackhuang.hellominecraft.util.func.Consumer;
 
 /**
@@ -25,18 +26,11 @@ import org.jackhuang.hellominecraft.util.func.Consumer;
  * @author huangyuhui
  * @param <T> EventArgs
  */
-public class EventHandler<T> {
+public class EventHandler<T extends EventObject> {
 
     ArrayList<Object> events = new ArrayList<>();
-    Object sender;
 
-    public EventHandler(Object sender) {
-        this.sender = sender;
-    }
-
-    public void register(Event<T> t) {
-        if (!events.contains(t))
-            events.add(t);
+    public EventHandler() {
     }
 
     public void register(Consumer<T> t) {
@@ -44,20 +38,40 @@ public class EventHandler<T> {
             events.add(t);
     }
 
+    public void registerFirst(Consumer<T> t) {
+        if (!events.contains(t))
+            events.add(0, t);
+    }
+
     public void register(Runnable t) {
         if (!events.contains(t))
             events.add(t);
     }
+    
+    public void registerFirst(Runnable t) {
+        if (!events.contains(t))
+            events.add(0, t);
+    }
 
-    public boolean execute(T x) {
+    public void fire(T x) {
+        for (Object t : events)
+            if (t instanceof Consumer) {
+                ((Consumer) t).accept(x);
+            } else if (t instanceof Runnable)
+                ((Runnable) t).run();
+    }
+
+    public boolean fireResulted(T x) {
+        if (!(x instanceof ResultedEvent))
+            throw new IllegalArgumentException("x should be ResultedEvent");
+        ResultedEvent event = (ResultedEvent) x;
         boolean flag = true;
         for (Object t : events)
-            if (t instanceof Event) {
-                if (!((Event<T>) t).call(sender, x))
+            if (t instanceof Consumer) {
+                ((Consumer) t).accept(x);
+                if (!event.result())
                     flag = false;
-            } else if (t instanceof Consumer)
-                ((Consumer<T>) t).accept(x);
-            else if (t instanceof Runnable)
+            } else if (t instanceof Runnable)
                 ((Runnable) t).run();
         return flag;
     }
diff --git a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/Event.java b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/HMCLAPI.java
old mode 100755
new mode 100644
similarity index 77%
rename from HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/Event.java
rename to HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/HMCLAPI.java
index dac90d675..2deb13100
--- a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/Event.java
+++ b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/HMCLAPI.java
@@ -1,7 +1,7 @@
 /*
- * Hello Minecraft!.
+ * Hello Minecraft! Launcher.
  * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
- *
+ * 
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
@@ -15,14 +15,16 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see {http://www.gnu.org/licenses/}.
  */
-package org.jackhuang.hellominecraft.util;
+package org.jackhuang.hellominecraft.api;
 
 /**
  *
- * @author huangyuhui
- * @param <T> EventArgs
+ * @author huang
  */
-public interface Event<T> {
+public class HMCLAPI {
 
-    boolean call(Object sender, T t);
+    /**
+     * Events.
+     */
+    public static final EventBus EVENT_BUS = new EventBus();
 }
diff --git a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/PropertyChangedEvent.java b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/PropertyChangedEvent.java
new file mode 100644
index 000000000..6f2549eba
--- /dev/null
+++ b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/PropertyChangedEvent.java
@@ -0,0 +1,49 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.api;
+
+import java.util.EventObject;
+
+/**
+ *
+ * @author huang
+ */
+public class PropertyChangedEvent<T> extends EventObject {
+    
+    String propertyName;
+    T oldValue, newValue;
+
+    public PropertyChangedEvent(Object source, String propertyName, T oldValue, T newValue) {
+        super(source);
+        this.propertyName = propertyName;
+        this.oldValue = oldValue;
+        this.newValue = newValue;
+    }
+
+    public String getPropertyName() {
+        return propertyName;
+    }
+
+    public T getNewValue() {
+        return newValue;
+    }
+
+    public T getOldValue() {
+        return oldValue;
+    }
+}
diff --git a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/ResultedEvent.java b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/ResultedEvent.java
new file mode 100644
index 000000000..144344259
--- /dev/null
+++ b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/ResultedEvent.java
@@ -0,0 +1,44 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.api;
+
+import java.util.EventObject;
+
+/**
+ *
+ * @author huang
+ */
+public class ResultedEvent extends EventObject {
+    protected boolean result = true;
+
+    public ResultedEvent(Object sender) {
+        super(sender);
+    }
+
+    public boolean result() {
+        return result;
+    }
+    
+    public void failed() {
+        setResult(false);
+    }
+
+    public void setResult(boolean canceled) {
+        this.result = canceled;
+    }
+}
diff --git a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/ResultedSimpleEvent.java b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/ResultedSimpleEvent.java
new file mode 100644
index 000000000..b0b374d0f
--- /dev/null
+++ b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/ResultedSimpleEvent.java
@@ -0,0 +1,41 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.api;
+
+/**
+ *
+ * @author huang
+ */
+public class ResultedSimpleEvent<T> extends ResultedEvent {
+
+    T value;
+
+    public ResultedSimpleEvent(Object sender, T t) {
+        super(sender);
+        value = t;
+    }
+
+    public T getValue() {
+        return value;
+    }
+
+    public void setValue(T value) {
+        this.value = value;
+    }
+
+}
diff --git a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/SimpleEvent.java b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/SimpleEvent.java
new file mode 100644
index 000000000..aa7c362ae
--- /dev/null
+++ b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/SimpleEvent.java
@@ -0,0 +1,41 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.api;
+
+import java.util.EventObject;
+
+/**
+ *
+ * @author huang
+ */
+public class SimpleEvent<T> extends EventObject {
+    private T value;
+
+    public SimpleEvent(Object source, T value) {
+        super(source);
+        this.value = value;
+    }
+
+    public T getValue() {
+        return value;
+    }
+
+    public void setValue(T value) {
+        this.value = value;
+    }
+}
diff --git a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/event/OutOfDateEvent.java b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/event/OutOfDateEvent.java
new file mode 100644
index 000000000..61f913daa
--- /dev/null
+++ b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/event/OutOfDateEvent.java
@@ -0,0 +1,40 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.api.event;
+
+import org.jackhuang.hellominecraft.api.ResultedSimpleEvent;
+import org.jackhuang.hellominecraft.util.VersionNumber;
+
+/**
+ * This event gets fired when we found that user's HMCL is out of date.
+ * <br>
+ * This event is {@link org.jackhuang.hellominecraft.api.ResultedEvent}
+ * If this event is failed, HMCL will not ask user to upgrade the application.
+ * <br>
+ * This event is fired on the {@link org.jackhuang.hellominecraft.api.HMCLAPI#EVENT_BUS}
+ * @param source {@link org.jackhuang.hellominecraft.util.UpdateChecker}
+ * @param VersionNumber newest version
+ * @author huang
+ */
+public class OutOfDateEvent extends ResultedSimpleEvent<VersionNumber> {
+    
+    public OutOfDateEvent(Object source, VersionNumber value) {
+        super(source, value);
+    }
+    
+}
diff --git a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/event/process/JVMLaunchFailedEvent.java b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/event/process/JVMLaunchFailedEvent.java
new file mode 100644
index 000000000..5b1f7891e
--- /dev/null
+++ b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/event/process/JVMLaunchFailedEvent.java
@@ -0,0 +1,37 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.api.event.process;
+
+import org.jackhuang.hellominecraft.api.SimpleEvent;
+import org.jackhuang.hellominecraft.util.sys.JavaProcess;
+
+/**
+ * This event gets fired when we launch the JVM and it got crashed.
+ * <br>
+ * This event is fired on the {@link org.jackhuang.hellominecraft.api.HMCLAPI#EVENT_BUS}
+ * @param source {@link org.jackhuang.hellominecraft.util.sys.JavaProcessMonitor}
+ * @param JavaProcess the crashed process.
+ * @author huangyuhui
+ */
+public class JVMLaunchFailedEvent extends SimpleEvent<JavaProcess> {
+    
+    public JVMLaunchFailedEvent(Object source, JavaProcess value) {
+        super(source, value);
+    }
+    
+}
diff --git a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/event/process/JavaProcessExitedAbnormallyEvent.java b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/event/process/JavaProcessExitedAbnormallyEvent.java
new file mode 100644
index 000000000..869dbb8c5
--- /dev/null
+++ b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/event/process/JavaProcessExitedAbnormallyEvent.java
@@ -0,0 +1,37 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.api.event.process;
+
+import org.jackhuang.hellominecraft.api.SimpleEvent;
+import org.jackhuang.hellominecraft.util.sys.JavaProcess;
+
+/**
+ * This event gets fired when a JavaProcess exited abnormally and the exit code is not zero.
+ * <br>
+ * This event is fired on the {@link org.jackhuang.hellominecraft.api.HMCLAPI#EVENT_BUS}
+ * @param source {@link org.jackhuang.hellominecraft.util.sys.JavaProcessMonitor}
+ * @param JavaProcess The process that exited abnormally.
+ * @author huangyuhui
+ */
+public class JavaProcessExitedAbnormallyEvent extends SimpleEvent<JavaProcess> {
+
+    public JavaProcessExitedAbnormallyEvent(Object source, JavaProcess value) {
+        super(source, value);
+    }
+
+}
diff --git a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/event/process/JavaProcessStartingEvent.java b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/event/process/JavaProcessStartingEvent.java
new file mode 100644
index 000000000..837bb7b20
--- /dev/null
+++ b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/event/process/JavaProcessStartingEvent.java
@@ -0,0 +1,37 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.api.event.process;
+
+import org.jackhuang.hellominecraft.api.SimpleEvent;
+import org.jackhuang.hellominecraft.util.sys.JavaProcess;
+
+/**
+ * This event gets fired when a JavaProcess is starting.
+ * <br>
+ * This event is fired on the {@link org.jackhuang.hellominecraft.api.HMCLAPI#EVENT_BUS}
+ * @param source {@link org.jackhuang.hellominecraft.util.sys.JavaProcessMonitor}
+ * @param JavaProcess the starting JavaProcess.
+ * @author huang
+ */
+public class JavaProcessStartingEvent extends SimpleEvent<JavaProcess> {
+    
+    public JavaProcessStartingEvent(Object source, JavaProcess value) {
+        super(source, value);
+    }
+    
+}
diff --git a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/event/process/JavaProcessStoppedEvent.java b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/event/process/JavaProcessStoppedEvent.java
new file mode 100644
index 000000000..0e84dcdb7
--- /dev/null
+++ b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/api/event/process/JavaProcessStoppedEvent.java
@@ -0,0 +1,37 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.api.event.process;
+
+import org.jackhuang.hellominecraft.api.SimpleEvent;
+import org.jackhuang.hellominecraft.util.sys.JavaProcess;
+
+/**
+ * This event gets fired when minecraft process exited successfully and the exit code is 0.
+ * <br>
+ * This event is fired on the {@link org.jackhuang.hellominecraft.api.HMCLAPI#EVENT_BUS}
+ * @param source {@link org.jackhuang.hellominecraft.util.sys.JavaProcessMonitor}
+ * @param JavaProcess minecraft process
+ * @author huangyuhui
+ */
+public class JavaProcessStoppedEvent extends SimpleEvent<JavaProcess> {
+    
+    public JavaProcessStoppedEvent(Object source, JavaProcess value) {
+        super(source, value);
+    }
+    
+}
diff --git a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/UpdateChecker.java b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/UpdateChecker.java
index d4b84d92b..b3a4804fd 100755
--- a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/UpdateChecker.java
+++ b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/UpdateChecker.java
@@ -17,11 +17,15 @@
  */
 package org.jackhuang.hellominecraft.util;
 
+import org.jackhuang.hellominecraft.api.EventHandler;
 import org.jackhuang.hellominecraft.util.net.NetUtils;
 import com.google.gson.JsonSyntaxException;
 import java.io.IOException;
 import org.jackhuang.hellominecraft.util.log.HMCLog;
 import java.util.Map;
+import org.jackhuang.hellominecraft.api.HMCLAPI;
+import org.jackhuang.hellominecraft.api.SimpleEvent;
+import org.jackhuang.hellominecraft.api.event.OutOfDateEvent;
 
 /**
  *
@@ -89,11 +93,12 @@ public final class UpdateChecker implements IUpdateChecker {
         };
     }
 
-    public final EventHandler<VersionNumber> outOfDateEvent = new EventHandler<>(this);
+    public final EventHandler<SimpleEvent<VersionNumber>> upgrade = new EventHandler<>();
 
     @Override
     public void checkOutdate() {
         if (outOfDate)
-            outOfDateEvent.execute(getNewVersion());
+            if (HMCLAPI.EVENT_BUS.fireChannelResulted(new OutOfDateEvent(this, getNewVersion())))
+                upgrade.fire(new SimpleEvent<>(this, getNewVersion()));
     }
 }
diff --git a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/func/Consumer.java b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/func/Consumer.java
index 6a379fba9..60252a170 100755
--- a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/func/Consumer.java
+++ b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/func/Consumer.java
@@ -17,11 +17,13 @@
  */
 package org.jackhuang.hellominecraft.util.func;
 
+import java.util.EventListener;
+
 /**
  *
  * @author huangyuhui
  */
-public interface Consumer<T> {
+public interface Consumer<T> extends EventListener {
 
     void accept(T t);
 }
diff --git a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/net/HTTPGetTask.java b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/net/HTTPGetTask.java
index 343282aad..e2ff969c1 100755
--- a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/net/HTTPGetTask.java
+++ b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/net/HTTPGetTask.java
@@ -27,7 +27,8 @@ import java.nio.charset.Charset;
 import org.jackhuang.hellominecraft.util.C;
 import org.jackhuang.hellominecraft.util.log.HMCLog;
 import org.jackhuang.hellominecraft.util.task.comm.PreviousResult;
-import org.jackhuang.hellominecraft.util.EventHandler;
+import org.jackhuang.hellominecraft.api.EventHandler;
+import org.jackhuang.hellominecraft.api.SimpleEvent;
 import org.jackhuang.hellominecraft.util.code.Charsets;
 import org.jackhuang.hellominecraft.util.task.Task;
 
@@ -39,7 +40,7 @@ public class HTTPGetTask extends Task implements PreviousResult<String> {
 
     String url, result;
     Charset encoding;
-    EventHandler<String> doneEvent = new EventHandler<>(this);
+    EventHandler<SimpleEvent<String>> doneEvent = new EventHandler<>();
     boolean shouldContinue = true;
 
     public HTTPGetTask(String url) {
@@ -81,7 +82,7 @@ public class HTTPGetTask extends Task implements PreviousResult<String> {
                         return;
                 }
                 result = baos.toString(encoding.name());
-                doneEvent.execute(result);
+                doneEvent.fire(new SimpleEvent<>(this, result));
                 return;
             } catch (IOException ex) {
                 t = new IOException("Failed to get " + url, ex);
diff --git a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/sys/JavaProcessMonitor.java b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/sys/JavaProcessMonitor.java
index a5c40eb76..9948a77b6 100755
--- a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/sys/JavaProcessMonitor.java
+++ b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/sys/JavaProcessMonitor.java
@@ -20,7 +20,12 @@ package org.jackhuang.hellominecraft.util.sys;
 import java.util.Arrays;
 import java.util.HashSet;
 import org.jackhuang.hellominecraft.util.CollectionUtils;
-import org.jackhuang.hellominecraft.util.EventHandler;
+import org.jackhuang.hellominecraft.api.EventHandler;
+import org.jackhuang.hellominecraft.api.HMCLAPI;
+import org.jackhuang.hellominecraft.api.event.process.JVMLaunchFailedEvent;
+import org.jackhuang.hellominecraft.api.event.process.JavaProcessExitedAbnormallyEvent;
+import org.jackhuang.hellominecraft.api.event.process.JavaProcessStartingEvent;
+import org.jackhuang.hellominecraft.api.event.process.JavaProcessStoppedEvent;
 import org.jackhuang.hellominecraft.util.StrUtils;
 import org.jackhuang.hellominecraft.util.log.HMCLog;
 import org.jackhuang.hellominecraft.util.log.Level;
@@ -32,20 +37,6 @@ import org.jackhuang.hellominecraft.util.log.Level;
 public class JavaProcessMonitor {
 
     private final HashSet<Thread> al = new HashSet<>();
-    /**
-     * this event will be executed only if the application returned 0.
-     */
-    public final EventHandler<JavaProcess> stoppedEvent = new EventHandler<>(this);
-    /**
-     * When the monitored application exited with exit code not zero, this event
-     * will be executed. Event args is the exit code.
-     */
-    public final EventHandler<Integer> applicationExitedAbnormallyEvent = new EventHandler<>(this);
-    /**
-     * When jvm crashed, this event will be executed. Event args is the exit
-     * code.
-     */
-    public final EventHandler<Integer> jvmLaunchFailedEvent = new EventHandler<>(this);
     private final JavaProcess p;
 
     public JavaProcessMonitor(JavaProcess p) {
@@ -55,24 +46,35 @@ public class JavaProcessMonitor {
     public JavaProcess getJavaProcess() {
         return p;
     }
+    
+    private Object tag;
+
+    public Object getTag() {
+        return tag;
+    }
+
+    public void setTag(Object tag) {
+        this.tag = tag;
+    }
+    
 
     public void start() {
+        HMCLAPI.EVENT_BUS.fireChannel(new JavaProcessStartingEvent(this, p));
         ProcessThread a = new ProcessThread(p);
-        a.stopEvent.register((sender, t) -> {
-            HMCLog.log("Process exit code: " + t.getExitCode());
-            if (t.getExitCode() != 0 || StrUtils.containsOne(t.getStdOutLines(),
+        a.stopEvent.register(event -> {
+            HMCLog.log("Process exit code: " + p.getExitCode());
+            if (p.getExitCode() != 0 || StrUtils.containsOne(p.getStdOutLines(),
                                                              Arrays.asList("Unable to launch"),
                                                              x -> Level.guessLevel(x, Level.INFO).lessOrEqual(Level.ERROR)))
-                applicationExitedAbnormallyEvent.execute(t.getExitCode());
-            if (t.getExitCode() != 0 && StrUtils.containsOne(t.getStdOutLines(),
+                HMCLAPI.EVENT_BUS.fireChannel(new JavaProcessExitedAbnormallyEvent(JavaProcessMonitor.this, p));
+            if (p.getExitCode() != 0 && StrUtils.containsOne(p.getStdOutLines(),
                                                              Arrays.asList("Could not create the Java Virtual Machine.",
                                                                            "Error occurred during initialization of VM",
                                                                            "A fatal exception has occurred. Program will exit.",
                                                                            "Unable to launch"),
                                                              x -> Level.guessLevel(x, Level.INFO).lessOrEqual(Level.ERROR)))
-                jvmLaunchFailedEvent.execute(t.getExitCode());
-            processThreadStopped((ProcessThread) sender, false);
-            return true;
+                HMCLAPI.EVENT_BUS.fireChannel(new JVMLaunchFailedEvent(JavaProcessMonitor.this, p));
+            processThreadStopped((ProcessThread) event.getSource(), false);
         });
         a.start();
         al.add(a);
@@ -84,7 +86,7 @@ public class JavaProcessMonitor {
             for (Thread a : al)
                 a.interrupt();
             al.clear();
-            stoppedEvent.execute(p);
+            HMCLAPI.EVENT_BUS.fireChannel(new JavaProcessStoppedEvent(this, p));
         }
     }
 }
diff --git a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/sys/ProcessThread.java b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/sys/ProcessThread.java
index 7e531710e..5f0916110 100755
--- a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/sys/ProcessThread.java
+++ b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/sys/ProcessThread.java
@@ -22,7 +22,8 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import org.jackhuang.hellominecraft.util.log.HMCLog;
-import org.jackhuang.hellominecraft.util.EventHandler;
+import org.jackhuang.hellominecraft.api.EventHandler;
+import org.jackhuang.hellominecraft.api.SimpleEvent;
 import org.jackhuang.hellominecraft.util.code.Charsets;
 
 /**
@@ -33,8 +34,8 @@ public class ProcessThread extends Thread {
 
     JavaProcess p;
 
-    public final EventHandler<String> printlnEvent = new EventHandler<>(this);
-    public final EventHandler<JavaProcess> stopEvent = new EventHandler<>(this);
+    public final EventHandler<SimpleEvent<String>> printlnEvent = new EventHandler<>();
+    public final EventHandler<SimpleEvent<JavaProcess>> stopEvent = new EventHandler<>();
 
     public ProcessThread(JavaProcess process) {
         p = process;
@@ -55,18 +56,18 @@ public class ProcessThread extends Thread {
             String line;
             while (p.isRunning())
                 while ((line = br.readLine()) != null) {
-                    printlnEvent.execute(line);
-                    System.out.println("Minecraft: " + line);
+                    printlnEvent.fire(new SimpleEvent<>(this, line));
+                    System.out.println("MC: " + line);
                     p.getStdOutLines().add(line);
                 }
             while ((line = br.readLine()) != null) {
-                printlnEvent.execute(line);
-                System.out.println("Minecraft: " + line);
+                printlnEvent.fire(new SimpleEvent<>(this, line));
+                System.out.println("MC: " + line);
                 p.getStdOutLines().add(line);
             }
             if (p.getProcessManager() != null)
                 p.getProcessManager().onProcessStopped(p);
-            stopEvent.execute(p);
+            stopEvent.fire(new SimpleEvent<>(this, p));
         } catch (IOException e) {
             HMCLog.err("An error occured when reading process stdout/stderr.", e);
         } finally {
diff --git a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/task/TaskList.java b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/task/TaskList.java
index f6a64a74c..7ce99c71a 100755
--- a/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/task/TaskList.java
+++ b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/task/TaskList.java
@@ -20,6 +20,7 @@ package org.jackhuang.hellominecraft.util.task;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
+import java.util.EventObject;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.LinkedList;
@@ -29,7 +30,7 @@ import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
 import java.util.concurrent.atomic.AtomicBoolean;
-import org.jackhuang.hellominecraft.util.EventHandler;
+import org.jackhuang.hellominecraft.api.EventHandler;
 import org.jackhuang.hellominecraft.util.log.HMCLog;
 
 /**
@@ -39,7 +40,7 @@ import org.jackhuang.hellominecraft.util.log.HMCLog;
 public class TaskList extends Thread {
 
     List<Task> taskQueue = Collections.synchronizedList(new LinkedList<>());
-    public final EventHandler<Object> doneEvent = new EventHandler<>(this);
+    public final EventHandler<EventObject> doneEvent = new EventHandler<>();
     ArrayList<DoingDoneListener<Task>> taskListener = new ArrayList<>();
 
     int totTask;
@@ -159,7 +160,7 @@ public class TaskList extends Thread {
             executeTask(taskQueue.remove(0));
         if (shouldContinue) {
             HMCLog.log("Tasks are successfully finished.");
-            doneEvent.execute(null);
+            doneEvent.fire(new EventObject(this));
         }
     }
 
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/Page.java b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/ui/Page.java
similarity index 93%
rename from HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/Page.java
rename to HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/ui/Page.java
index 48e50678b..95317c808 100755
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/Page.java
+++ b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/ui/Page.java
@@ -15,7 +15,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see {http://www.gnu.org/licenses/}.
  */
-package org.jackhuang.hellominecraft.launcher.ui;
+package org.jackhuang.hellominecraft.util.ui;
 
 import java.awt.AlphaComposite;
 import java.awt.Graphics;
@@ -24,7 +24,6 @@ import java.awt.image.BufferedImage;
 import javax.swing.JPanel;
 import javax.swing.SwingUtilities;
 import javax.swing.Timer;
-import org.jackhuang.hellominecraft.launcher.setting.Settings;
 
 /**
  *
@@ -118,10 +117,10 @@ public class Page extends JPanel implements Selectable {
 
     Timer timer;
 
-    boolean animationEnabled = true;
+    protected boolean animationEnabled = true;
 
     public void animate() {
-        if (Settings.getInstance().isEnableAnimation() && animationEnabled) {
+        if (animationEnabled) {
             offsetX = 0;
             timer.start();
         }
diff --git a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/Selectable.java b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/ui/Selectable.java
similarity index 94%
rename from HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/Selectable.java
rename to HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/ui/Selectable.java
index 9189eb446..a7c28c65b 100755
--- a/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/ui/Selectable.java
+++ b/HMCUtils/src/main/java/org/jackhuang/hellominecraft/util/ui/Selectable.java
@@ -15,7 +15,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see {http://www.gnu.org/licenses/}.
  */
-package org.jackhuang.hellominecraft.launcher.ui;
+package org.jackhuang.hellominecraft.util.ui;
 
 /**
  *