Merge pull request #399 from yushijinhun/refactor-account

重构账户部分

HMCL/src/main/java/org/jackhuang/hmcl/event/AccountAddedEvent.java

@@ -1,57 +0,0 @@
-/*
- * Hello Minecraft! Launcher.
- * Copyright (C) 2018  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.hmcl.event;
-
-import org.jackhuang.hmcl.auth.Account;
-import org.jackhuang.hmcl.util.ToStringBuilder;
-
-/**
- * This event gets fired when added accounts.
- * <br>
- * This event is fired on the {@link org.jackhuang.hmcl.event.EventBus#EVENT_BUS}
- *
- * @author huangyuhui
- */
-public class AccountAddedEvent extends Event {
-
-    private final Account account;
-
-    /**
-     * Constructor.
-     *
-     * @param source {@link org.jackhuang.hmcl.setting.Settings}
-     */
-    public AccountAddedEvent(Object source, Account account) {
-        super(source);
-        this.account = account;
-    }
-
-
-    public Account getAccount() {
-        return account;
-    }
-
-    @Override
-    public String toString() {
-        return new ToStringBuilder(this)
-                .append("source", source)
-                .append("account", account)
-                .toString();
-    }
-}
-

HMCL/src/main/java/org/jackhuang/hmcl/event/AccountLoadingEvent.java

@@ -1,60 +0,0 @@
-/*
- * Hello Minecraft! Launcher.
- * Copyright (C) 2018  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.hmcl.event;
-
-import org.jackhuang.hmcl.auth.Account;
-import org.jackhuang.hmcl.util.ToStringBuilder;
-
-import java.util.Collection;
-import java.util.Collections;
-
-/**
- * This event gets fired when loading accounts.
- * <br>
- * This event is fired on the {@link org.jackhuang.hmcl.event.EventBus#EVENT_BUS}
- *
- * @author huangyuhui
- */
-public class AccountLoadingEvent extends Event {
-
-    private final Collection<Account> accounts;
-
-    /**
-     * Constructor.
-     *
-     * @param source {@link org.jackhuang.hmcl.setting.Settings}
-     */
-    public AccountLoadingEvent(Object source, Collection<Account> accounts) {
-        super(source);
-        this.accounts = Collections.unmodifiableCollection(accounts);
-    }
-
-
-    public Collection<Account> getAccounts() {
-        return accounts;
-    }
-
-    @Override
-    public String toString() {
-        return new ToStringBuilder(this)
-                .append("source", source)
-                .append("accounts", accounts)
-                .toString();
-    }
-}
-

HMCL/src/main/java/org/jackhuang/hmcl/game/AccountHelper.java

@@ -24,7 +24,7 @@ import org.jackhuang.hmcl.auth.Account;
 import org.jackhuang.hmcl.auth.yggdrasil.GameProfile;
 import org.jackhuang.hmcl.auth.yggdrasil.Texture;
 import org.jackhuang.hmcl.auth.yggdrasil.YggdrasilAccount;
-import org.jackhuang.hmcl.setting.Settings;
+import org.jackhuang.hmcl.setting.Accounts;
 import org.jackhuang.hmcl.task.FileDownloadTask;
 import org.jackhuang.hmcl.task.Scheduler;
 import org.jackhuang.hmcl.task.Schedulers;
@@ -42,7 +42,7 @@ public final class AccountHelper {
     public static final File SKIN_DIR = new File(Launcher.HMCL_DIRECTORY, "skins");
 
     public static void loadSkins() {
-        for (Account account : Settings.INSTANCE.getAccounts()) {
+        for (Account account : Accounts.getAccounts()) {
             if (account instanceof YggdrasilAccount) {
                 new SkinLoadTask((YggdrasilAccount) account, false).start();
             }

HMCL/src/main/java/org/jackhuang/hmcl/setting/Accounts.java

@@ -1,7 +1,7 @@
 /*
  * Hello Minecraft! Launcher.
  * Copyright (C) 2018  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
@@ -29,14 +29,27 @@ import org.jackhuang.hmcl.auth.offline.OfflineAccountFactory;
 import org.jackhuang.hmcl.auth.yggdrasil.MojangYggdrasilProvider;
 import org.jackhuang.hmcl.auth.yggdrasil.YggdrasilAccount;
 import org.jackhuang.hmcl.auth.yggdrasil.YggdrasilAccountFactory;
+
+import javafx.beans.Observable;
+import javafx.beans.property.ObjectProperty;
+import javafx.beans.property.ReadOnlyListProperty;
+import javafx.beans.property.ReadOnlyListWrapper;
+import javafx.beans.property.SimpleObjectProperty;
+import javafx.collections.ObservableList;
+
 import java.io.IOException;
 import java.util.Map;
+import java.util.Optional;
 import java.util.logging.Level;
 
+import static java.util.stream.Collectors.toList;
+import static javafx.collections.FXCollections.observableArrayList;
 import static org.jackhuang.hmcl.setting.ConfigHolder.CONFIG;
+import static org.jackhuang.hmcl.ui.FXUtils.onInvalidating;
 import static org.jackhuang.hmcl.util.Lang.mapOf;
 import static org.jackhuang.hmcl.util.Logging.LOG;
 import static org.jackhuang.hmcl.util.Pair.pair;
+import static org.jackhuang.hmcl.util.i18n.I18n.i18n;
 
 /**
  * @author huangyuhui
@@ -44,33 +57,160 @@ import static org.jackhuang.hmcl.util.Pair.pair;
 public final class Accounts {
     private Accounts() {}
 
-    public static final String OFFLINE_ACCOUNT_KEY = "offline";
-    public static final String YGGDRASIL_ACCOUNT_KEY = "yggdrasil";
-    public static final String AUTHLIB_INJECTOR_ACCOUNT_KEY = "authlibInjector";
+    public static final OfflineAccountFactory FACTORY_OFFLINE = OfflineAccountFactory.INSTANCE;
+    public static final YggdrasilAccountFactory FACTORY_YGGDRASIL = new YggdrasilAccountFactory(MojangYggdrasilProvider.INSTANCE);
+    public static final AuthlibInjectorAccountFactory FACTORY_AUTHLIB_INJECTOR = new AuthlibInjectorAccountFactory(
+            new AuthlibInjectorDownloader(Launcher.HMCL_DIRECTORY.toPath(), () -> Settings.INSTANCE.getDownloadProvider())::getArtifactInfo,
+            Accounts::getOrCreateAuthlibInjectorServer);
 
-    public static final Map<String, AccountFactory<?>> ACCOUNT_FACTORY = mapOf(
-            pair(OFFLINE_ACCOUNT_KEY, OfflineAccountFactory.INSTANCE),
-            pair(YGGDRASIL_ACCOUNT_KEY, new YggdrasilAccountFactory(MojangYggdrasilProvider.INSTANCE)),
-            pair(AUTHLIB_INJECTOR_ACCOUNT_KEY, new AuthlibInjectorAccountFactory(
-                    new AuthlibInjectorDownloader(Launcher.HMCL_DIRECTORY.toPath(), () -> Settings.INSTANCE.getDownloadProvider())::getArtifactInfo,
-                    Accounts::getOrCreateAuthlibInjectorServer))
-    );
+    private static final String TYPE_OFFLINE = "offline";
+    private static final String TYPE_YGGDRASIL_ACCOUNT = "yggdrasil";
+    private static final String TYPE_AUTHLIB_INJECTOR = "authlibInjector";
 
-    public static String getAccountType(Account account) {
-        if (account instanceof OfflineAccount) return OFFLINE_ACCOUNT_KEY;
-        else if (account instanceof AuthlibInjectorAccount) return AUTHLIB_INJECTOR_ACCOUNT_KEY;
-        else if (account instanceof YggdrasilAccount) return YGGDRASIL_ACCOUNT_KEY;
-        else return YGGDRASIL_ACCOUNT_KEY;
+    private static Map<String, AccountFactory<?>> type2factory = mapOf(
+            pair(TYPE_OFFLINE, FACTORY_OFFLINE),
+            pair(TYPE_YGGDRASIL_ACCOUNT, FACTORY_YGGDRASIL),
+            pair(TYPE_AUTHLIB_INJECTOR, FACTORY_AUTHLIB_INJECTOR));
+
+    private static String accountType(Account account) {
+        if (account instanceof OfflineAccount)
+            return TYPE_OFFLINE;
+        else if (account instanceof AuthlibInjectorAccount)
+            return TYPE_AUTHLIB_INJECTOR;
+        else if (account instanceof YggdrasilAccount)
+            return TYPE_YGGDRASIL_ACCOUNT;
+        else
+            throw new IllegalArgumentException("Failed to determine account type: " + account);
     }
 
-    static String getAccountId(Account account) {
-        return getAccountId(account.getUsername(), account.getCharacter());
+    public static AccountFactory<?> getAccountFactory(Account account) {
+        return type2factory.get(accountType(account));
     }
 
-    static String getAccountId(String username, String character) {
-        return username + ":" + character;
+    private static String accountId(Account account) {
+        return account.getUsername() + ":" + account.getCharacter();
     }
 
+    private static ObservableList<Account> accounts = observableArrayList(account -> new Observable[] { account });
+    private static ReadOnlyListProperty<Account> accountsWrapper = new ReadOnlyListWrapper<>(accounts);
+
+    private static ObjectProperty<Account> selectedAccount = new SimpleObjectProperty<Account>() {
+        {
+            accounts.addListener(onInvalidating(this::invalidated));
+        }
+
+        @Override
+        protected void invalidated() {
+            // this methods first checks whether the current selection is valid
+            // if it's valid, the underlying storage will be updated
+            // otherwise, the first account will be selected as an alternative(or null if accounts is empty)
+            Account selected = get();
+            if (accounts.isEmpty()) {
+                if (selected == null) {
+                    // valid
+                } else {
+                    // the previously selected account is gone, we can only set it to null here
+                    set(null);
+                    return;
+                }
+            } else {
+                if (accounts.contains(selected)) {
+                    // valid
+                } else {
+                    // the previously selected account is gone
+                    set(accounts.get(0));
+                    return;
+                }
+            }
+            // selection is valid, store it
+            if (!initialized)
+                return;
+            CONFIG.setSelectedAccount(selected == null ? "" : accountId(selected));
+        }
+    };
+
+    /**
+     * True if {@link #init()} hasn't been called.
+     */
+    private static boolean initialized = false;
+
+    static {
+        accounts.addListener(onInvalidating(Accounts::updateAccountStorages));
+    }
+
+    private static void updateAccountStorages() {
+        // don't update the underlying storage before data loading is completed
+        // otherwise it might cause data loss
+        if (!initialized)
+            return;
+        // update storage
+        CONFIG.getAccountStorages().setAll(
+                accounts.stream()
+                        .map(account -> {
+                            Map<Object, Object> storage = account.toStorage();
+                            storage.put("type", accountType(account));
+                            return storage;
+                        })
+                        .collect(toList()));
+    }
+
+    /**
+     * Called when it's ready to load accounts from {@link ConfigHolder#CONFIG}.
+     */
+    static void init() {
+        if (initialized)
+            throw new IllegalStateException("Already initialized");
+
+        // load accounts
+        CONFIG.getAccountStorages().forEach(storage -> {
+            AccountFactory<?> factory = type2factory.get(storage.get("type"));
+            if (factory == null) {
+                LOG.warning("Unrecognized account type: " + storage);
+                return;
+            }
+            Account account;
+            try {
+                account = factory.fromStorage(storage);
+            } catch (Exception e) {
+                LOG.log(Level.WARNING, "Failed to load account: " + storage, e);
+                return;
+            }
+            accounts.add(account);
+        });
+
+        initialized = true;
+
+        CONFIG.getAuthlibInjectorServers().addListener(onInvalidating(Accounts::removeDanglingAuthlibInjectorAccounts));
+
+        // load selected account
+        selectedAccount.set(
+                accounts.stream()
+                        .filter(it -> accountId(it).equals(CONFIG.getSelectedAccount()))
+                        .findFirst()
+                        .orElse(null));
+    }
+
+    public static ObservableList<Account> getAccounts() {
+        return accounts;
+    }
+
+    public static ReadOnlyListProperty<Account> accountsProperty() {
+        return accountsWrapper;
+    }
+
+    public static Account getSelectedAccount() {
+        return selectedAccount.get();
+    }
+
+    public static void setSelectedAccount(Account selectedAccount) {
+        Accounts.selectedAccount.set(selectedAccount);
+    }
+
+    public static ObjectProperty<Account> selectedAccountProperty() {
+        return selectedAccount;
+    }
+
+    // ==== authlib-injector ====
     private static AuthlibInjectorServer getOrCreateAuthlibInjectorServer(String url) {
         return CONFIG.getAuthlibInjectorServers().stream()
                 .filter(server -> url.equals(server.getUrl()))
@@ -90,4 +230,34 @@ public final class Accounts {
                     return server;
                 });
     }
+
+    /**
+     * After an {@link AuthlibInjectorServer} is removed, the associated accounts should also be removed.
+     * This method performs a check and removes the dangling accounts.
+     */
+    private static void removeDanglingAuthlibInjectorAccounts() {
+        accounts.stream()
+                .filter(AuthlibInjectorAccount.class::isInstance)
+                .map(AuthlibInjectorAccount.class::cast)
+                .filter(it -> !CONFIG.getAuthlibInjectorServers().contains(it.getServer()))
+                .collect(toList())
+                .forEach(accounts::remove);
+    }
+    // ====
+
+    // ==== Login type name i18n ===
+    private static Map<AccountFactory<?>, String> loginType2name = mapOf(
+            pair(Accounts.FACTORY_OFFLINE, i18n("account.methods.offline")),
+            pair(Accounts.FACTORY_YGGDRASIL, i18n("account.methods.yggdrasil")),
+            pair(Accounts.FACTORY_AUTHLIB_INJECTOR, i18n("account.methods.authlib_injector")));
+
+    public static String getAccountTypeName(AccountFactory<?> factory) {
+        return Optional.ofNullable(loginType2name.get(factory))
+                .orElseThrow(() -> new IllegalArgumentException("No corresponding login type name"));
+    }
+
+    public static String getAccountTypeName(Account account) {
+        return getAccountTypeName(getAccountFactory(account));
+    }
+    // ====
 }

HMCL/src/main/java/org/jackhuang/hmcl/setting/Config.java

@@ -129,7 +129,7 @@ public final class Config implements Cloneable, Observable {
     private ObservableMap<String, Profile> configurations = FXCollections.observableMap(new TreeMap<>());
 
     @SerializedName("accounts")
-    private ObservableList<Map<Object, Object>> accounts = FXCollections.observableArrayList();
+    private ObservableList<Map<Object, Object>> accountStorages = FXCollections.observableArrayList();
 
     @SerializedName("selectedAccount")
     private StringProperty selectedAccount = new SimpleStringProperty("");
@@ -379,8 +379,8 @@ public final class Config implements Cloneable, Observable {
         return configurations;
     }
 
-    public ObservableList<Map<Object, Object>> getAccounts() {
-        return accounts;
+    public ObservableList<Map<Object, Object>> getAccountStorages() {
+        return accountStorages;
     }
 
     public String getSelectedAccount() {

HMCL/src/main/java/org/jackhuang/hmcl/setting/ProxyManager.java

@@ -36,7 +36,7 @@ public final class ProxyManager {
     private ProxyManager() {
     }
 
-    private static final ObjectBinding<Proxy> proxyProperty = Bindings.createObjectBinding(
+    private static ObjectBinding<Proxy> proxyProperty = Bindings.createObjectBinding(
             () -> {
                 String host = CONFIG.getProxyHost();
                 Integer port = Lang.toIntOrNull(CONFIG.getProxyPort());
@@ -59,11 +59,7 @@ public final class ProxyManager {
         return proxyProperty;
     }
 
-    static {
-        initProxy();
-    }
-
-    private static void initProxy() {
+    static void init() {
         proxyProperty.addListener(observable -> updateSystemProxy());
 
         updateSystemProxy();

HMCL/src/main/java/org/jackhuang/hmcl/setting/Settings.java

@@ -17,16 +17,10 @@
  */
 package org.jackhuang.hmcl.setting;
 
-import javafx.beans.InvalidationListener;
-import javafx.beans.property.ObjectProperty;
 import javafx.beans.value.ObservableValue;
 import javafx.scene.text.Font;
 
 import org.jackhuang.hmcl.Launcher;
-import org.jackhuang.hmcl.auth.Account;
-import org.jackhuang.hmcl.auth.AccountFactory;
-import org.jackhuang.hmcl.auth.authlibinjector.AuthlibInjectorAccount;
-import org.jackhuang.hmcl.auth.authlibinjector.AuthlibInjectorServer;
 import org.jackhuang.hmcl.download.DownloadProvider;
 import org.jackhuang.hmcl.event.*;
 import org.jackhuang.hmcl.task.Schedulers;
@@ -35,82 +29,37 @@ import org.jackhuang.hmcl.util.i18n.Locales;
 
 import java.io.File;
 import java.util.*;
-import java.util.concurrent.ConcurrentHashMap;
-import java.util.logging.Level;
 import java.util.stream.Collectors;
 
-import static java.util.stream.Collectors.toList;
 import static org.jackhuang.hmcl.setting.ConfigHolder.CONFIG;
-import static org.jackhuang.hmcl.ui.FXUtils.onInvalidating;
-import static org.jackhuang.hmcl.util.Lang.tryCast;
 import static org.jackhuang.hmcl.util.Logging.LOG;
 
 public class Settings {
 
     public static final Settings INSTANCE = new Settings();
 
-    private final Map<String, Account> accounts = new ConcurrentHashMap<>();
-
     private final boolean firstLaunch;
 
-    private InvalidationListener accountChangeListener =
-            source -> CONFIG.getAccounts().setAll(
-                    accounts.values().stream()
-                            .map(account -> {
-                                Map<Object, Object> storage = account.toStorage();
-                                storage.put("type", Accounts.getAccountType(account));
-                                return storage;
-                            })
-                            .collect(toList()));
-
     private Settings() {
         firstLaunch = CONFIG.isFirstLaunch();
         CONFIG.setFirstLaunch(false);
 
-        ProxyManager.getProxy(); // init ProxyManager
-
-        for (Iterator<Map<Object, Object>> iterator = CONFIG.getAccounts().iterator(); iterator.hasNext();) {
-            Map<Object, Object> settings = iterator.next();
-            AccountFactory<?> factory = Accounts.ACCOUNT_FACTORY.get(tryCast(settings.get("type"), String.class).orElse(""));
-            if (factory == null) {
-                LOG.warning("Unrecognized account type, removing: " + settings);
-                iterator.remove();
-                continue;
-            }
-
-            Account account;
-            try {
-                account = factory.fromStorage(settings);
-            } catch (Exception e) {
-                LOG.log(Level.WARNING, "Malformed account storage, removing: " + settings, e);
-                iterator.remove();
-                continue;
-            }
-
-            accounts.put(Accounts.getAccountId(account), account);
-            account.addListener(accountChangeListener);
-        }
-
-        CONFIG.getAuthlibInjectorServers().addListener(onInvalidating(this::removeDanglingAuthlibInjectorAccounts));
-
-        this.selectedAccount.set(accounts.get(CONFIG.getSelectedAccount()));
+        ProxyManager.init();
+        Accounts.init();
 
         checkProfileMap();
 
-        save();
-
         for (Map.Entry<String, Profile> profileEntry : getProfileMap().entrySet()) {
             profileEntry.getValue().setName(profileEntry.getKey());
             profileEntry.getValue().nameProperty().setChangedListener(this::profileNameChanged);
             profileEntry.getValue().addPropertyChangedListener(e -> save());
         }
 
-        Lang.ignoringException(() -> Runtime.getRuntime().addShutdownHook(new Thread(this::save)));
-
         CONFIG.addListener(source -> save());
     }
 
     private void save() {
+        LOG.info("Saving config");
         ConfigHolder.saveConfig(CONFIG);
     }
 
@@ -167,23 +116,6 @@ public class Settings {
         }
     }
 
-    /****************************************
-     *           AUTHLIB INJECTORS          *
-     ****************************************/
-
-    /**
-     * After an {@link AuthlibInjectorServer} is removed, the associated accounts should also be removed.
-     * This method performs a check and removes the dangling accounts.
-     * Don't call this before {@link #migrateAuthlibInjectorServers()} is called, otherwise old data would be lost.
-     */
-    private void removeDanglingAuthlibInjectorAccounts() {
-        accounts.values().stream()
-                .filter(AuthlibInjectorAccount.class::isInstance)
-                .filter(it -> !CONFIG.getAuthlibInjectorServers().contains(((AuthlibInjectorAccount) it).getServer()))
-                .collect(toList())
-                .forEach(this::deleteAccount);
-    }
-
     /****************************************
      *        DOWNLOAD PROVIDERS            *
      ****************************************/
@@ -199,86 +131,6 @@ public class Settings {
         CONFIG.setDownloadType(index);
     }
 
-    /****************************************
-     *               ACCOUNTS               *
-     ****************************************/
-
-    private final ImmediateObjectProperty<Account> selectedAccount = new ImmediateObjectProperty<Account>(this, "selectedAccount", null) {
-        @Override
-        public Account get() {
-            Account a = super.get();
-            if (a == null || !accounts.containsKey(Accounts.getAccountId(a))) {
-                Account acc = accounts.values().stream().findAny().orElse(null);
-                set(acc);
-                return acc;
-            } else return a;
-        }
-
-        @Override
-        public void set(Account newValue) {
-            if (newValue == null || accounts.containsKey(Accounts.getAccountId(newValue))) {
-                super.set(newValue);
-            }
-        }
-
-        @Override
-        public void invalidated() {
-            super.invalidated();
-
-            CONFIG.setSelectedAccount(getValue() == null ? "" : Accounts.getAccountId(getValue()));
-        }
-    };
-
-    public Account getSelectedAccount() {
-        return selectedAccount.get();
-    }
-
-    public ObjectProperty<Account> selectedAccountProperty() {
-        return selectedAccount;
-    }
-
-    public void setSelectedAccount(Account selectedAccount) {
-        this.selectedAccount.set(selectedAccount);
-    }
-
-    public void addAccount(Account account) {
-        accounts.put(Accounts.getAccountId(account), account);
-        account.addListener(accountChangeListener);
-        accountChangeListener.invalidated(account);
-
-        onAccountLoading();
-
-        EventBus.EVENT_BUS.fireEvent(new AccountAddedEvent(this, account));
-    }
-
-    public Account getAccount(String name, String character) {
-        return accounts.get(Accounts.getAccountId(name, character));
-    }
-
-    public Collection<Account> getAccounts() {
-        return Collections.unmodifiableCollection(accounts.values());
-    }
-
-    public void deleteAccount(String name, String character) {
-        Account removed = accounts.remove(Accounts.getAccountId(name, character));
-        if (removed != null) {
-            removed.removeListener(accountChangeListener);
-            accountChangeListener.invalidated(removed);
-
-            onAccountLoading();
-            selectedAccount.get();
-        }
-    }
-
-    public void deleteAccount(Account account) {
-        accounts.remove(Accounts.getAccountId(account));
-        account.removeListener(accountChangeListener);
-        accountChangeListener.invalidated(account);
-
-        onAccountLoading();
-        selectedAccount.get();
-    }
-
     /****************************************
      *               PROFILES               *
      ****************************************/
@@ -369,8 +221,4 @@ public class Settings {
         EventBus.EVENT_BUS.fireEvent(new ProfileLoadingEvent(this, getProfiles()));
         onProfileChanged();
     }
-
-    public void onAccountLoading() {
-        EventBus.EVENT_BUS.fireEvent(new AccountLoadingEvent(this, getAccounts()));
-    }
 }

HMCL/src/main/java/org/jackhuang/hmcl/ui/AccountPage.java

@@ -35,7 +35,7 @@ import org.jackhuang.hmcl.auth.authlibinjector.AuthlibInjectorServer;
 import org.jackhuang.hmcl.auth.offline.OfflineAccount;
 import org.jackhuang.hmcl.auth.yggdrasil.YggdrasilAccount;
 import org.jackhuang.hmcl.game.AccountHelper;
-import org.jackhuang.hmcl.setting.Settings;
+import org.jackhuang.hmcl.setting.Accounts;
 import org.jackhuang.hmcl.setting.Theme;
 import org.jackhuang.hmcl.task.Schedulers;
 import org.jackhuang.hmcl.ui.construct.ComponentList;
@@ -97,7 +97,7 @@ public class AccountPage extends StackPane implements DecoratorPage {
         btnRefresh.setGraphic(SVG.refresh(Theme.blackFillBinding(), 15, 15));
 
         lblCharacter.setText(account.getCharacter());
-        lblType.setText(AddAccountPane.accountType(account));
+        lblType.setText(Accounts.getAccountTypeName(account));
         lblEmail.setText(account.getUsername());
 
         btnRefresh.setVisible(account instanceof YggdrasilAccount);
@@ -105,7 +105,7 @@ public class AccountPage extends StackPane implements DecoratorPage {
 
     @FXML
     private void onDelete() {
-        Settings.INSTANCE.deleteAccount(account);
+        Accounts.getAccounts().remove(account);
         Optional.ofNullable(onDelete.get()).ifPresent(Runnable::run);
     }
 

HMCL/src/main/java/org/jackhuang/hmcl/ui/AddAccountPane.java

@@ -21,7 +21,7 @@ import com.jfoenix.concurrency.JFXUtilities;
 import com.jfoenix.controls.*;
 
 import javafx.beans.binding.Bindings;
-import javafx.beans.property.ReadOnlyIntegerProperty;
+import javafx.beans.property.ReadOnlyObjectProperty;
 import javafx.fxml.FXML;
 import javafx.geometry.Pos;
 import javafx.scene.control.Hyperlink;
@@ -33,15 +33,12 @@ import javafx.scene.layout.HBox;
 import javafx.scene.layout.StackPane;
 
 import org.jackhuang.hmcl.auth.*;
-import org.jackhuang.hmcl.auth.authlibinjector.AuthlibInjectorAccount;
 import org.jackhuang.hmcl.auth.authlibinjector.AuthlibInjectorServer;
-import org.jackhuang.hmcl.auth.offline.OfflineAccount;
 import org.jackhuang.hmcl.auth.yggdrasil.GameProfile;
 import org.jackhuang.hmcl.auth.yggdrasil.RemoteAuthenticationException;
 import org.jackhuang.hmcl.auth.yggdrasil.YggdrasilAccount;
 import org.jackhuang.hmcl.game.AccountHelper;
 import org.jackhuang.hmcl.setting.Accounts;
-import org.jackhuang.hmcl.setting.Settings;
 import org.jackhuang.hmcl.task.Schedulers;
 import org.jackhuang.hmcl.task.Task;
 import org.jackhuang.hmcl.ui.construct.AdvancedListBox;
@@ -51,24 +48,25 @@ import org.jackhuang.hmcl.ui.construct.SpinnerPane;
 import org.jackhuang.hmcl.ui.construct.Validator;
 import org.jackhuang.hmcl.util.Constants;
 import org.jackhuang.hmcl.util.Logging;
+
+import java.util.List;
+import java.util.concurrent.CountDownLatch;
+import java.util.logging.Level;
+
+import static java.util.Objects.requireNonNull;
 import static org.jackhuang.hmcl.setting.ConfigHolder.CONFIG;
 import static org.jackhuang.hmcl.ui.FXUtils.jfxListCellFactory;
 import static org.jackhuang.hmcl.ui.FXUtils.onInvalidating;
 import static org.jackhuang.hmcl.ui.FXUtils.stringConverter;
 import static org.jackhuang.hmcl.util.i18n.I18n.i18n;
 
-import java.util.List;
-import java.util.Optional;
-import java.util.concurrent.CountDownLatch;
-import java.util.logging.Level;
-
 public class AddAccountPane extends StackPane {
 
     @FXML private JFXTextField txtUsername;
     @FXML private JFXPasswordField txtPassword;
     @FXML private Label lblCreationWarning;
     @FXML private Label lblPassword;
-    @FXML private JFXComboBox<String> cboType;
+    @FXML private JFXComboBox<AccountFactory<?>> cboType;
     @FXML private JFXComboBox<AuthlibInjectorServer> cboServers;
     @FXML private Label lblInjectorServer;
     @FXML private Hyperlink linkManageInjectorServers;
@@ -85,23 +83,31 @@ public class AddAccountPane extends StackPane {
         cboServers.getItems().addListener(onInvalidating(this::selectDefaultServer));
         selectDefaultServer();
 
-        cboType.getItems().setAll(i18n("account.methods.offline"), i18n("account.methods.yggdrasil"), i18n("account.methods.authlib_injector"));
+        cboType.getItems().setAll(Accounts.FACTORY_OFFLINE, Accounts.FACTORY_YGGDRASIL, Accounts.FACTORY_AUTHLIB_INJECTOR);
+        cboType.setConverter(stringConverter(Accounts::getAccountTypeName));
         cboType.getSelectionModel().select(0);
 
-        ReadOnlyIntegerProperty loginTypeIdProperty = cboType.getSelectionModel().selectedIndexProperty();
+        ReadOnlyObjectProperty<AccountFactory<?>> loginType = cboType.getSelectionModel().selectedItemProperty();
 
-        txtPassword.visibleProperty().bind(loginTypeIdProperty.isNotEqualTo(0));
+        txtPassword.visibleProperty().bind(loginType.isNotEqualTo(Accounts.FACTORY_OFFLINE));
         lblPassword.visibleProperty().bind(txtPassword.visibleProperty());
 
-        cboServers.visibleProperty().bind(loginTypeIdProperty.isEqualTo(2));
+        cboServers.visibleProperty().bind(loginType.isEqualTo(Accounts.FACTORY_AUTHLIB_INJECTOR));
         lblInjectorServer.visibleProperty().bind(cboServers.visibleProperty());
         linkManageInjectorServers.visibleProperty().bind(cboServers.visibleProperty());
 
         txtUsername.getValidators().add(new Validator(i18n("input.email"), str -> !txtPassword.isVisible() || str.contains("@")));
 
         btnAccept.disableProperty().bind(Bindings.createBooleanBinding(
-                () -> !txtUsername.validate() || (loginTypeIdProperty.get() != 0 && !txtPassword.validate()),
-                txtUsername.textProperty(), txtPassword.textProperty(), loginTypeIdProperty));
+                () -> !( // consider the opposite situation: input is valid
+                        txtUsername.validate() &&
+                        // invisible means the field is not needed, neither should it be validated
+                        (!txtPassword.isVisible() || txtPassword.validate()) &&
+                        (!cboServers.isVisible() || cboServers.getSelectionModel().getSelectedItem() != null)
+                ),
+                txtUsername.textProperty(),
+                txtPassword.textProperty(), txtPassword.visibleProperty(),
+                cboServers.getSelectionModel().selectedItemProperty(), cboServers.visibleProperty()));
     }
 
     /**
@@ -113,47 +119,48 @@ public class AddAccountPane extends StackPane {
         }
     }
 
+    /**
+     * Gets the additional data that needs to be passed into {@link AccountFactory#create(CharacterSelector, String, String, Object)}.
+     */
+    private Object getAuthAdditionalData() {
+        AccountFactory<?> factory = cboType.getSelectionModel().getSelectedItem();
+        if (factory == Accounts.FACTORY_AUTHLIB_INJECTOR) {
+            return requireNonNull(cboServers.getSelectionModel().getSelectedItem(), "selected server cannot be null");
+        }
+        return null;
+    }
+
     @FXML
     private void onCreationAccept() {
         if (btnAccept.isDisabled())
             return;
 
-        String username = txtUsername.getText();
-        String password = txtPassword.getText();
-        Object addtionalData;
-
-        int type = cboType.getSelectionModel().getSelectedIndex();
-        AccountFactory<?> factory;
-        switch (type) {
-            case 0:
-                factory = Accounts.ACCOUNT_FACTORY.get(Accounts.OFFLINE_ACCOUNT_KEY);
-                addtionalData = null;
-                break;
-            case 1:
-                factory = Accounts.ACCOUNT_FACTORY.get(Accounts.YGGDRASIL_ACCOUNT_KEY);
-                addtionalData = null;
-                break;
-            case 2:
-                factory = Accounts.ACCOUNT_FACTORY.get(Accounts.AUTHLIB_INJECTOR_ACCOUNT_KEY);
-                Optional<AuthlibInjectorServer> server = Optional.ofNullable(cboServers.getSelectionModel().getSelectedItem());
-                if (server.isPresent()) {
-                    addtionalData = server.get();
-                } else {
-                    lblCreationWarning.setText(i18n("account.failed.no_selected_server"));
-                    return;
-                }
-                break;
-            default:
-                throw new Error();
-        }
-
         acceptPane.showSpinner();
         lblCreationWarning.setText("");
         setDisable(true);
 
-        Task.ofResult("create_account", () -> factory.create(new Selector(), username, password, addtionalData))
+        String username = txtUsername.getText();
+        String password = txtPassword.getText();
+        AccountFactory<?> factory = cboType.getSelectionModel().getSelectedItem();
+        Object additionalData = getAuthAdditionalData();
+
+        Task.ofResult("create_account", () -> factory.create(new Selector(), username, password, additionalData))
                 .finalized(Schedulers.javafx(), variables -> {
-                    Settings.INSTANCE.addAccount(variables.get("create_account"));
+
+                    Account account = variables.get("create_account");
+                    int oldIndex = Accounts.getAccounts().indexOf(account);
+                    if (oldIndex == -1) {
+                        Accounts.getAccounts().add(account);
+                    } else {
+                        // adding an already-added account
+                        // instead of discarding the new account, we first remove the existing one then add the new one
+                        Accounts.getAccounts().remove(oldIndex);
+                        Accounts.getAccounts().add(oldIndex, account);
+                    }
+
+                    // select the new account
+                    Accounts.setSelectedAccount(account);
+
                     acceptPane.hideSpinner();
                     fireEvent(new DialogCloseEvent());
                 }, exception -> {
@@ -272,11 +279,4 @@ public class AddAccountPane extends StackPane {
             return exception.getClass().getName() + ": " + exception.getLocalizedMessage();
         }
     }
-
-    public static String accountType(Account account) {
-        if (account instanceof OfflineAccount) return i18n("account.methods.offline");
-        else if (account instanceof AuthlibInjectorAccount) return i18n("account.methods.authlib_injector");
-        else if (account instanceof YggdrasilAccount) return i18n("account.methods.yggdrasil");
-        else throw new Error(i18n("account.methods.no_method") + ": " + account);
-    }
 }

HMCL/src/main/java/org/jackhuang/hmcl/ui/AuthlibInjectorServersPage.java

@@ -17,17 +17,18 @@
  */
 package org.jackhuang.hmcl.ui;
 
-import static java.util.stream.Collectors.toList;
 import static org.jackhuang.hmcl.ui.FXUtils.loadFXML;
 import static org.jackhuang.hmcl.ui.FXUtils.smoothScrolling;
 import static org.jackhuang.hmcl.util.i18n.I18n.i18n;
 
+import org.jackhuang.hmcl.auth.authlibinjector.AuthlibInjectorServer;
 import org.jackhuang.hmcl.ui.wizard.DecoratorPage;
+import org.jackhuang.hmcl.util.MappedObservableList;
 
-import javafx.beans.InvalidationListener;
-import javafx.beans.WeakInvalidationListener;
+import javafx.beans.binding.Bindings;
 import javafx.beans.property.SimpleStringProperty;
 import javafx.beans.property.StringProperty;
+import javafx.collections.ObservableList;
 import javafx.fxml.FXML;
 import javafx.scene.control.ScrollPane;
 import javafx.scene.layout.StackPane;
@@ -42,26 +43,21 @@ public class AuthlibInjectorServersPage extends StackPane implements DecoratorPa
     @FXML private VBox listPane;
     @FXML private StackPane contentPane;
 
-    private InvalidationListener serversListener;
+    private ObservableList<AuthlibInjectorServerItem> serverItems;
 
     public AuthlibInjectorServersPage() {
         loadFXML(this, "/assets/fxml/authlib-injector-servers.fxml");
         smoothScrolling(scrollPane);
 
-        serversListener = observable -> updateServersList();
-        CONFIG.getAuthlibInjectorServers().addListener(new WeakInvalidationListener(serversListener));
-        updateServersList();
+        serverItems = MappedObservableList.create(CONFIG.getAuthlibInjectorServers(), this::createServerItem);
+        Bindings.bindContent(listPane.getChildren(), serverItems);
     }
 
-    private void updateServersList() {
-        listPane.getChildren().setAll(
-                CONFIG.getAuthlibInjectorServers().stream()
-                        .map(server -> new AuthlibInjectorServerItem(server,
-                                item -> CONFIG.getAuthlibInjectorServers().remove(item.getServer())))
-                        .collect(toList()));
+    private AuthlibInjectorServerItem createServerItem(AuthlibInjectorServer server) {
+        return new AuthlibInjectorServerItem(server,
+                item -> CONFIG.getAuthlibInjectorServers().remove(item.getServer()));
     }
 
-
     @FXML
     private void onAdd() {
         Controllers.dialog(new AddAuthlibInjectorServerPane());

HMCL/src/main/java/org/jackhuang/hmcl/ui/LeftPaneController.java

@@ -21,6 +21,12 @@ import com.jfoenix.concurrency.JFXUtilities;
 import com.jfoenix.controls.JFXButton;
 import com.jfoenix.controls.JFXPopup;
 import javafx.application.Platform;
+import javafx.beans.binding.Bindings;
+import javafx.beans.binding.When;
+import javafx.beans.property.ListProperty;
+import javafx.beans.property.ObjectProperty;
+import javafx.beans.property.SimpleListProperty;
+import javafx.beans.property.SimpleObjectProperty;
 import javafx.scene.Node;
 import javafx.scene.control.Tooltip;
 import javafx.scene.image.Image;
@@ -49,21 +55,39 @@ import org.jackhuang.hmcl.ui.construct.DialogCloseEvent;
 import org.jackhuang.hmcl.ui.construct.IconedItem;
 import org.jackhuang.hmcl.ui.construct.RipplerContainer;
 import org.jackhuang.hmcl.util.Lang;
-import static org.jackhuang.hmcl.util.i18n.I18n.i18n;
+import org.jackhuang.hmcl.util.MappedObservableList;
 
 import java.io.File;
-import java.util.HashMap;
 import java.util.LinkedList;
 import java.util.Objects;
+import java.util.Optional;
 import java.util.concurrent.atomic.AtomicReference;
 
+import static javafx.collections.FXCollections.singletonObservableList;
+import static org.jackhuang.hmcl.ui.FXUtils.onInvalidating;
+import static org.jackhuang.hmcl.util.i18n.I18n.i18n;
+
 public final class LeftPaneController {
     private final AdvancedListBox leftPane;
     private final VBox profilePane = new VBox();
     private final VBox accountPane = new VBox();
     private final IconedItem launcherSettingsItem;
-    private final VersionListItem missingAccountItem = new VersionListItem(i18n("account.missing"), i18n("message.unknown"));
-    private final HashMap<Account, VersionListItem> items = new HashMap<>();
+
+    private ListProperty<RipplerContainer> accountItems = new SimpleListProperty<>();
+    private ObjectProperty<Account> selectedAccount = new SimpleObjectProperty<Account>() {
+        {
+            accountItems.addListener(onInvalidating(this::invalidated));
+        }
+
+        @Override
+        protected void invalidated() {
+            Account selected = get();
+            accountItems.forEach(item -> item.setSelected(
+                    getAccountFromItem(item)
+                            .map(it -> it == selected)
+                            .orElse(false)));
+        }
+    };
 
     public LeftPaneController(AdvancedListBox leftPane) {
         this.leftPane = leftPane;
@@ -90,30 +114,91 @@ public final class LeftPaneController {
                 })))
                 .add(profilePane);
 
-        EventBus.EVENT_BUS.channel(AccountAddedEvent.class).register(this::onAccountAdd);
-        EventBus.EVENT_BUS.channel(AccountLoadingEvent.class).register(this::onAccountsLoading);
+        // ==== Accounts ====
+        // Missing account item
+        VersionListItem missingAccountItem = new VersionListItem(i18n("account.missing"), i18n("message.unknown"));
+        RipplerContainer missingAccountRippler = new RipplerContainer(missingAccountItem);
+        missingAccountItem.setOnSettingsButtonClicked(e -> addNewAccount());
+        missingAccountRippler.setOnMouseClicked(e -> addNewAccount());
+
+        accountItems.bind(
+                new When(Accounts.accountsProperty().emptyProperty())
+                        .then(singletonObservableList(missingAccountRippler))
+                        .otherwise(MappedObservableList.create(Accounts.getAccounts(), this::createAccountItem)));
+        Bindings.bindContent(accountPane.getChildren(), accountItems);
+
+        selectedAccount.bindBidirectional(Accounts.selectedAccountProperty());
+        // ====
+
         EventBus.EVENT_BUS.channel(ProfileLoadingEvent.class).register(this::onProfilesLoading);
         EventBus.EVENT_BUS.channel(ProfileChangedEvent.class).register(this::onProfileChanged);
         EventBus.EVENT_BUS.channel(RefreshedVersionsEvent.class).register(this::onRefreshedVersions);
+    }
 
-        FXUtils.onChangeAndOperate(Settings.INSTANCE.selectedAccountProperty(), this::onSelectedAccountChanged);
-        onAccountsLoading();
+    // ==== Accounts ====
+    private Optional<Account> getAccountFromItem(RipplerContainer accountItem) {
+        return Optional.ofNullable(accountItem.getProperties().get("account"))
+                .map(Account.class::cast);
+    }
+
+    private static String accountSubtitle(Account account) {
+        if (account instanceof OfflineAccount)
+            return i18n("account.methods.offline");
+        else if (account instanceof YggdrasilAccount)
+            return account.getUsername();
+        else
+            return "";
+    }
+
+    private RipplerContainer createAccountItem(Account account) {
+        VersionListItem item = new VersionListItem(account.getCharacter(), accountSubtitle(account));
+        RipplerContainer rippler = new RipplerContainer(item);
+        item.setOnSettingsButtonClicked(e -> {
+            AccountPage accountPage = new AccountPage(account, item);
+            JFXPopup popup = new JFXPopup(accountPage);
+            accountPage.setOnDelete(popup::hide);
+            popup.show((Node) e.getSource(), JFXPopup.PopupVPosition.TOP, JFXPopup.PopupHPosition.LEFT, e.getX(), e.getY());
+        });
+        rippler.setOnMouseClicked(e -> {
+            if (e.getButton() == MouseButton.PRIMARY) {
+                selectedAccount.set(account);
+            }
+        });
+        rippler.getProperties().put("account", account);
+        rippler.maxWidthProperty().bind(leftPane.widthProperty());
+
+        if (account instanceof YggdrasilAccount) {
+            Image image = AccountHelper.getSkin((YggdrasilAccount) account, 4);
+            item.setImage(image, AccountHelper.getViewport(4));
+        } else {
+            item.setImage(AccountHelper.getDefaultSkin(account.getUUID(), 4), AccountHelper.getViewport(4));
+        }
+
+        if (account instanceof AuthlibInjectorAccount) {
+            FXUtils.installTooltip(rippler, 500, 5000, 0, new Tooltip(((AuthlibInjectorAccount) account).getServer().getName()));
+        }
+
+        // update skin
+        if (account instanceof YggdrasilAccount) {
+            AccountHelper.refreshSkinAsync((YggdrasilAccount) account)
+                    .subscribe(Schedulers.javafx(), () -> {
+                        Image image = AccountHelper.getSkin((YggdrasilAccount) account, 4);
+                        item.setImage(image, AccountHelper.getViewport(4));
+                    });
+        }
+
+        return rippler;
+    }
+
+    public void checkAccount() {
+        if (Accounts.getAccounts().isEmpty())
+            addNewAccount();
     }
 
     private void addNewAccount() {
         Controllers.dialog(new AddAccountPane());
     }
-
-    private void onSelectedAccountChanged(Account newAccount) {
-        Platform.runLater(() -> {
-            for (Node node : accountPane.getChildren()) {
-                if (node instanceof RipplerContainer && node.getProperties().get("account") instanceof Account) {
-                    boolean current = Objects.equals(node.getProperties().get("account"), newAccount);
-                    ((RipplerContainer) node).setSelected(current);
-                }
-            }
-        });
-    }
+    // ====
 
     private void onProfileChanged(ProfileChangedEvent event) {
         Profile profile = event.getProfile();
@@ -143,70 +228,6 @@ public final class LeftPaneController {
         Platform.runLater(() -> profilePane.getChildren().setAll(list));
     }
 
-    private static String accountType(Account account) {
-        if (account instanceof OfflineAccount) return i18n("account.methods.offline");
-        else if (account instanceof YggdrasilAccount) return account.getUsername();
-        else throw new Error(i18n("account.methods.no_method") + ": " + account);
-    }
-
-    private void onAccountAdd(AccountAddedEvent event) {
-        Account account = event.getAccount();
-        VersionListItem item = items.get(account);
-        if (account instanceof YggdrasilAccount)
-            AccountHelper.refreshSkinAsync((YggdrasilAccount) account)
-                    .subscribe(Schedulers.javafx(), () -> {
-                        Image image = AccountHelper.getSkin((YggdrasilAccount) account, 4);
-                        item.setImage(image, AccountHelper.getViewport(4));
-                    });
-    }
-
-    private void onAccountsLoading() {
-        LinkedList<RipplerContainer> list = new LinkedList<>();
-        items.clear();
-        Account selectedAccount = Settings.INSTANCE.getSelectedAccount();
-        for (Account account : Settings.INSTANCE.getAccounts()) {
-            VersionListItem item = new VersionListItem(account.getCharacter(), accountType(account));
-            items.put(account, item);
-            RipplerContainer ripplerContainer = new RipplerContainer(item);
-            item.setOnSettingsButtonClicked(e -> {
-                AccountPage accountPage = new AccountPage(account, item);
-                JFXPopup popup = new JFXPopup(accountPage);
-                accountPage.setOnDelete(popup::hide);
-                popup.show((Node) e.getSource(), JFXPopup.PopupVPosition.TOP, JFXPopup.PopupHPosition.LEFT, e.getX(), e.getY());
-            });
-            ripplerContainer.setOnMouseClicked(e -> {
-                if (e.getButton() == MouseButton.PRIMARY)
-                    Settings.INSTANCE.setSelectedAccount(account);
-            });
-            ripplerContainer.getProperties().put("account", account);
-            ripplerContainer.maxWidthProperty().bind(leftPane.widthProperty());
-
-            if (account instanceof YggdrasilAccount) {
-                Image image = AccountHelper.getSkin((YggdrasilAccount) account, 4);
-                item.setImage(image, AccountHelper.getViewport(4));
-            } else
-                item.setImage(AccountHelper.getDefaultSkin(account.getUUID(), 4), AccountHelper.getViewport(4));
-
-            if (account instanceof AuthlibInjectorAccount) {
-                FXUtils.installTooltip(ripplerContainer, 500, 5000, 0, new Tooltip(((AuthlibInjectorAccount) account).getServer().getName()));
-            }
-
-            if (selectedAccount == account)
-                ripplerContainer.setSelected(true);
-
-            list.add(ripplerContainer);
-        }
-
-        if (Settings.INSTANCE.getAccounts().isEmpty()) {
-            RipplerContainer container = new RipplerContainer(missingAccountItem);
-            missingAccountItem.setOnSettingsButtonClicked(e -> addNewAccount());
-            container.setOnMouseClicked(e -> addNewAccount());
-            list.add(container);
-        }
-
-        Platform.runLater(() -> accountPane.getChildren().setAll(list));
-    }
-
     public void showUpdate() {
         launcherSettingsItem.setText(i18n("update.found"));
         launcherSettingsItem.setTextFill(Color.RED);
@@ -247,9 +268,4 @@ public final class LeftPaneController {
             }
         });
     }
-
-    public void checkAccount() {
-        if (Settings.INSTANCE.getAccounts().isEmpty())
-            addNewAccount();
-    }
 }

HMCL/src/main/java/org/jackhuang/hmcl/ui/MainPage.java

@@ -37,6 +37,7 @@ import org.jackhuang.hmcl.event.RefreshingVersionsEvent;
 import org.jackhuang.hmcl.game.*;
 import org.jackhuang.hmcl.mod.MismatchedModpackTypeException;
 import org.jackhuang.hmcl.mod.UnsupportedModpackException;
+import org.jackhuang.hmcl.setting.Accounts;
 import org.jackhuang.hmcl.setting.Profile;
 import org.jackhuang.hmcl.setting.Settings;
 import org.jackhuang.hmcl.task.Schedulers;
@@ -132,13 +133,13 @@ public final class MainPage extends StackPane implements DecoratorPage {
         });
         item.setVersionName(id);
         item.setOnLaunchButtonClicked(e -> {
-            if (Settings.INSTANCE.getSelectedAccount() == null)
+            if (Accounts.getSelectedAccount() == null)
                 Controllers.getLeftPaneController().checkAccount();
             else
-                LauncherHelper.INSTANCE.launch(profile, Settings.INSTANCE.getSelectedAccount(), id, null);
+                LauncherHelper.INSTANCE.launch(profile, Accounts.getSelectedAccount(), id, null);
         });
         item.setOnScriptButtonClicked(e -> {
-            if (Settings.INSTANCE.getSelectedAccount() == null)
+            if (Accounts.getSelectedAccount() == null)
                 Controllers.dialog(i18n("login.empty_username"));
             else {
                 FileChooser chooser = new FileChooser();
@@ -150,7 +151,7 @@ public final class MainPage extends StackPane implements DecoratorPage {
                         : new FileChooser.ExtensionFilter(i18n("extension.sh"), "*.sh"));
                 File file = chooser.showSaveDialog(Controllers.getStage());
                 if (file != null)
-                    LauncherHelper.INSTANCE.launch(profile, Settings.INSTANCE.getSelectedAccount(), id, file);
+                    LauncherHelper.INSTANCE.launch(profile, Accounts.getSelectedAccount(), id, file);
             }
         });
         item.setOnSettingsButtonClicked(e -> {
@@ -214,10 +215,10 @@ public final class MainPage extends StackPane implements DecoratorPage {
                 });
                 versionPopup.show(item, JFXPopup.PopupVPosition.TOP, JFXPopup.PopupHPosition.LEFT, event.getX(), event.getY());
             } else if (event.getButton() == MouseButton.PRIMARY && event.getClickCount() == 2) {
-                if (Settings.INSTANCE.getSelectedAccount() == null)
+                if (Accounts.getSelectedAccount() == null)
                     Controllers.dialog(i18n("login.empty_username"));
                 else
-                    LauncherHelper.INSTANCE.launch(profile, Settings.INSTANCE.getSelectedAccount(), id, null);
+                    LauncherHelper.INSTANCE.launch(profile, Accounts.getSelectedAccount(), id, null);
             }
         });
         File iconFile = repository.getVersionIcon(id);

HMCL/src/main/java/org/jackhuang/hmcl/ui/SettingsPage.java

@@ -104,7 +104,9 @@ public final class SettingsPage extends StackPane implements DecoratorPage {
     @FXML
     private Pane proxyPane;
 
-    {
+    private ObjectProperty<Proxy.Type> selectedProxyType;
+
+    public SettingsPage() {
         FXUtils.loadFXML(this, "/assets/fxml/setting.fxml");
 
         FXUtils.smoothScrolling(scroll);
@@ -151,7 +153,7 @@ public final class SettingsPage extends StackPane implements DecoratorPage {
         chkEnableProxy.selectedProperty().bindBidirectional(CONFIG.hasProxyProperty());
         chkProxyAuthentication.selectedProperty().bindBidirectional(CONFIG.hasProxyAuthProperty());
 
-        ObjectProperty<Proxy.Type> selectedProxyType = new SimpleObjectProperty<Proxy.Type>(Proxy.Type.HTTP) {
+        selectedProxyType = new SimpleObjectProperty<Proxy.Type>(Proxy.Type.HTTP) {
             {
                 invalidated();
             }
@@ -196,7 +198,7 @@ public final class SettingsPage extends StackPane implements DecoratorPage {
         FXUtils.installTooltip(btnUpdate, i18n("update.tooltip"));
         checkUpdate();
 
-        // background
+        // ==== Background ====
         backgroundItem.loadChildren(Collections.singletonList(
                 backgroundItem.createChildren(i18n("launcher.background.default"), EnumBackgroundImage.DEFAULT)
         ), EnumBackgroundImage.CUSTOM);
@@ -206,8 +208,9 @@ public final class SettingsPage extends StackPane implements DecoratorPage {
                 new When(backgroundItem.selectedDataProperty().isEqualTo(EnumBackgroundImage.DEFAULT))
                         .then(i18n("launcher.background.default"))
                         .otherwise(CONFIG.backgroundImageProperty()));
+        // ====
 
-        // theme
+        // ==== Theme ====
         JFXColorPicker picker = new JFXColorPicker(Color.web(CONFIG.getTheme().getColor()), null);
         picker.setCustomColorText(i18n("color.custom"));
         picker.setRecentColorsText(i18n("color.recent"));
@@ -219,6 +222,7 @@ public final class SettingsPage extends StackPane implements DecoratorPage {
         });
         themeColorPickerContainer.getChildren().setAll(picker);
         Platform.runLater(() -> JFXDepthManager.setDepth(picker, 0));
+        // ====
     }
 
     public String getTitle() {

HMCL/src/main/java/org/jackhuang/hmcl/ui/export/ModpackInfoPage.java

@@ -28,7 +28,7 @@ import javafx.scene.layout.StackPane;
 import javafx.stage.FileChooser;
 import org.jackhuang.hmcl.Launcher;
 import org.jackhuang.hmcl.auth.Account;
-import org.jackhuang.hmcl.setting.Settings;
+import org.jackhuang.hmcl.setting.Accounts;
 import org.jackhuang.hmcl.ui.Controllers;
 import org.jackhuang.hmcl.ui.FXUtils;
 import org.jackhuang.hmcl.ui.wizard.WizardController;
@@ -67,7 +67,7 @@ public final class ModpackInfoPage extends StackPane implements WizardPage {
         txtModpackName.textProperty().addListener(e -> checkValidation());
         txtModpackAuthor.textProperty().addListener(e -> checkValidation());
         txtModpackVersion.textProperty().addListener(e -> checkValidation());
-        txtModpackAuthor.setText(Optional.ofNullable(Settings.INSTANCE.getSelectedAccount()).map(Account::getUsername).orElse(""));
+        txtModpackAuthor.setText(Optional.ofNullable(Accounts.getSelectedAccount()).map(Account::getUsername).orElse(""));
         lblVersionName.setText(version);
 
         List<File> launcherJar = Launcher.getCurrentJarFiles();

HMCL/src/main/resources/assets/lang/I18N.properties

@@ -39,7 +39,6 @@ account.failed.invalid_credentials=Incorrect password, or you are forbidden to l
 account.failed.invalid_password=Invalid password
 account.failed.invalid_token=Please log out and re-input your password to login.
 account.failed.no_character=No character in this account.
-account.failed.no_selected_server=No authentication server is selected.
 account.failed.connect_injector_server=Cannot connect to the authentication server. Check your network and ensure the URL is correct.
 account.injector.add=Add an authentication server
 account.injector.manage=Manage authentication servers
@@ -50,7 +49,6 @@ account.injector.server_url=Server URL
 account.injector.server_name=Server Name
 account.methods=Login Type
 account.methods.authlib_injector=authlib-injector
-account.methods.no_method=No login method
 account.methods.offline=Offline
 account.methods.yggdrasil=Mojang
 account.missing=None

HMCL/src/main/resources/assets/lang/I18N_zh.properties

@@ -39,7 +39,6 @@ account.failed.invalid_credentials=您的用戶名或密碼錯誤，或者登錄
 account.failed.invalid_password=無效的密碼
 account.failed.invalid_token=請嘗試登出並重新輸入密碼登錄
 account.failed.no_character=該帳號沒有角色
-account.failed.no_selected_server=未選擇認證服務器
 account.failed.connect_injector_server=無法連接認證服務器，可能是網絡故障或 URL 輸入錯誤
 account.injector.add=添加認證服務器
 account.injector.manage=管理認證服務器
@@ -50,7 +49,6 @@ account.injector.server_url=服務器地址
 account.injector.server_name=服務器名稱
 account.methods=登錄方式
 account.methods.authlib_injector=authlib-injector 登錄
-account.methods.no_method=沒有登入方式
 account.methods.offline=離線模式
 account.methods.yggdrasil=正版登錄
 account.missing=沒有賬戶

HMCL/src/main/resources/assets/lang/I18N_zh_CN.properties

@@ -39,7 +39,6 @@ account.failed.invalid_credentials=您的用户名或密码错误，或者登录
 account.failed.invalid_password=无效的密码
 account.failed.invalid_token=请尝试登出并重新输入密码登录
 account.failed.no_character=该帐号没有角色
-account.failed.no_selected_server=未选择认证服务器
 account.failed.connect_injector_server=无法连接认证服务器，可能是网络故障或 URL 输入错误
 account.injector.add=添加认证服务器
 account.injector.manage=管理认证服务器
@@ -50,7 +49,6 @@ account.injector.server_url=服务器地址
 account.injector.server_name=服务器名称
 account.methods=登录方式
 account.methods.authlib_injector=authlib-injector 登录
-account.methods.no_method=没有登入方式
 account.methods.offline=离线模式
 account.methods.yggdrasil=正版登录
 account.missing=没有账户

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/authlibinjector/AuthlibInjectorAccount.java

@@ -31,6 +31,7 @@ import org.jackhuang.hmcl.util.NetworkUtils;
 
 import java.util.Base64;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Optional;
 import java.util.UUID;
 import java.util.logging.Level;
@@ -110,4 +111,16 @@ public class AuthlibInjectorAccount extends YggdrasilAccount {
         return server;
     }
 
+    @Override
+    public int hashCode() {
+        return Objects.hash(super.hashCode(), server.hashCode());
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (!(obj instanceof AuthlibInjectorAccount))
+            return false;
+        AuthlibInjectorAccount another = (AuthlibInjectorAccount) obj;
+        return super.equals(another) && server.equals(another.server);
+    }
 }

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/offline/OfflineAccount.java

@@ -105,4 +105,17 @@ public class OfflineAccount extends Account {
                 .append("uuid", uuid)
                 .toString();
     }
+
+    @Override
+    public int hashCode() {
+        return username.hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (!(obj instanceof OfflineAccount))
+            return false;
+        OfflineAccount another = (OfflineAccount) obj;
+        return username.equals(another.username);
+    }
 }

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/yggdrasil/YggdrasilAccount.java

@@ -169,4 +169,16 @@ public class YggdrasilAccount extends Account {
         return "YggdrasilAccount[username=" + getUsername() + "]";
     }
 
+    @Override
+    public int hashCode() {
+        return characterUUID.hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (!(obj instanceof YggdrasilAccount))
+            return false;
+        YggdrasilAccount another = (YggdrasilAccount) obj;
+        return characterUUID.equals(another.characterUUID);
+    }
 }

HMCLCore/src/main/java/org/jackhuang/hmcl/util/Lang.java

@@ -41,7 +41,7 @@ public final class Lang {
      */
     @SafeVarargs
     public static <K, V> Map<K, V> mapOf(Pair<K, V>... pairs) {
-        HashMap<K, V> map = new HashMap<>();
+        Map<K, V> map = new LinkedHashMap<>();
         for (Pair<K, V> pair : pairs)
             map.put(pair.getKey(), pair.getValue());
         return map;

HMCLCore/src/main/java/org/jackhuang/hmcl/util/MappedObservableList.java

@@ -0,0 +1,160 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2018  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.hmcl.util;
+
+import static java.util.stream.Collectors.toCollection;
+import static javafx.collections.FXCollections.unmodifiableObservableList;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.IdentityHashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Function;
+
+import javafx.beans.InvalidationListener;
+import javafx.beans.Observable;
+import javafx.collections.FXCollections;
+import javafx.collections.ListChangeListener;
+import javafx.collections.ObservableList;
+import javafx.collections.WeakListChangeListener;
+
+/**
+ * @author yushijinhun
+ */
+public final class MappedObservableList {
+    private MappedObservableList() {
+    }
+
+    private static class ReferenceHolder implements InvalidationListener {
+        @SuppressWarnings("unused")
+        private Object ref;
+
+        ReferenceHolder(Object ref) {
+            this.ref = ref;
+        }
+
+        @Override
+        public void invalidated(Observable observable) {
+            // no-op
+        }
+    }
+
+    private static class MappedObservableListUpdater<T, U> implements ListChangeListener<T> {
+        private ObservableList<T> origin;
+        private ObservableList<U> target;
+        private Function<T, U> mapper;
+
+        // If we directly synchronize changes to target, each operation on target will cause a event to be fired.
+        // So we first write changes to buffer. After all the changes are processed, we use target.setAll to synchronize the changes.
+        private List<U> buffer;
+
+        MappedObservableListUpdater(ObservableList<T> origin, ObservableList<U> target, Function<T, U> mapper) {
+            this.origin = origin;
+            this.target = target;
+            this.mapper = mapper;
+            this.buffer = new ArrayList<>(target);
+        }
+
+        @Override
+        public void onChanged(Change<? extends T> change) {
+            // cache removed elements to reduce calls to mapper
+            Map<T, LinkedList<U>> cache = new IdentityHashMap<>();
+
+            while (change.next()) {
+                int from = change.getFrom();
+                int to = change.getTo();
+
+                if (change.wasPermutated()) {
+                    @SuppressWarnings("unchecked")
+                    U[] temp = (U[]) new Object[to - from];
+                    for (int i = 0; i < temp.length; i++) {
+                        temp[i] = buffer.get(from + i);
+                    }
+
+                    for (int idx = from; idx < to; idx++) {
+                        buffer.set(change.getPermutation(idx), temp[idx - from]);
+                    }
+                } else {
+                    if (change.wasRemoved()) {
+                        List<? extends T> originRemoved = change.getRemoved();
+                        List<U> targetRemoved = buffer.subList(from, from + originRemoved.size());
+                        for (int i = 0; i < targetRemoved.size(); i++) {
+                            pushCache(cache, originRemoved.get(i), targetRemoved.get(i));
+                        }
+                        targetRemoved.clear();
+                    }
+                    if (change.wasAdded()) {
+                        @SuppressWarnings("unchecked")
+                        U[] toAdd = (U[]) new Object[to - from];
+                        for (int i = 0; i < toAdd.length; i++) {
+                            toAdd[i] = map(cache, origin.get(from + i));
+                        }
+                        buffer.addAll(from, Arrays.asList(toAdd));
+                    }
+                }
+            }
+            target.setAll(buffer);
+        }
+
+        private void pushCache(Map<T, LinkedList<U>> cache, T key, U value) {
+            cache.computeIfAbsent(key, any -> new LinkedList<>())
+                    .push(value);
+        }
+
+        private U map(Map<T, LinkedList<U>> cache, T key) {
+            LinkedList<U> stack = cache.get(key);
+            if (stack != null && !stack.isEmpty()) {
+                return stack.pop();
+            }
+            return mapper.apply(key);
+        }
+    }
+
+    /**
+     * This methods creates a mapping of {@code origin}, using {@code mapper} as the converter.
+     *
+     * If an item is added to {@code origin}, {@code mapper} will be invoked to create a corresponding item, which will also be added to the returned {@code ObservableList}.
+     * If an item is removed from {@code origin}, the corresponding item in the returned {@code ObservableList} will also be removed.
+     * If {@code origin} is permutated, the returned {@code ObservableList} will also be permutated in the same way.
+     *
+     * The returned {@code ObservableList} is unmodifiable.
+     */
+    public static <T, U> ObservableList<U> create(ObservableList<T> origin, Function<T, U> mapper) {
+        // create a already-synchronized target ObservableList<U>
+        ObservableList<U> target = origin.stream()
+                .map(mapper)
+                .collect(toCollection(FXCollections::observableArrayList));
+
+        // then synchronize further changes to target
+        ListChangeListener<T> listener = new MappedObservableListUpdater<>(origin, target, mapper);
+
+        // let target hold a reference to listener to prevent listener being garbage-collected before target is garbage-collected
+        target.addListener(new ReferenceHolder(listener));
+
+        // let origin hold a weak reference to listener, so that target can be garbage-collected when it's no longer used
+        origin.addListener(new WeakListChangeListener<>(listener));
+
+        // ref graph:
+        // target ------> listener <-weak- origin
+        //        <------          ------>
+
+        return unmodifiableObservableList(target);
+    }
+}