feat(ui): support translucent background.

Fix no background when network image url is wrong. Closes #1116.

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

@@ -21,5 +21,6 @@ public enum EnumBackgroundImage {
     DEFAULT,
     CUSTOM,
     CLASSIC,
-    NETWORK
+    NETWORK,
+    TRANSLUCENT
 }

HMCL/src/main/java/org/jackhuang/hmcl/ui/decorator/DecoratorController.java

@@ -24,11 +24,13 @@ import javafx.beans.binding.Bindings;
 import javafx.beans.value.ChangeListener;
 import javafx.beans.value.ObservableValue;
 import javafx.event.EventHandler;
+import javafx.geometry.Insets;
 import javafx.scene.Node;
 import javafx.scene.image.Image;
 import javafx.scene.input.DragEvent;
 import javafx.scene.input.KeyEvent;
 import javafx.scene.layout.*;
+import javafx.scene.paint.Color;
 import javafx.stage.Stage;
 import org.jackhuang.hmcl.Launcher;
 import org.jackhuang.hmcl.auth.authlibinjector.AuthlibInjectorDnD;
@@ -43,6 +45,7 @@ import org.jackhuang.hmcl.ui.construct.Navigator;
 import org.jackhuang.hmcl.ui.construct.StackContainerPane;
 import org.jackhuang.hmcl.ui.wizard.Refreshable;
 import org.jackhuang.hmcl.ui.wizard.WizardProvider;
+import org.jackhuang.hmcl.util.io.NetworkUtils;
 
 import java.io.IOException;
 import java.nio.file.Files;
@@ -140,9 +143,15 @@ public class DecoratorController {
                                         .orElse(null);
                             }
                             if (config().getBackgroundImageType() == EnumBackgroundImage.NETWORK) {
-                                image = new Image(config().getBackgroundImageUrl(), true);
+                                if (!NetworkUtils.isURL(config().getBackgroundImageUrl())) {
+                                    image = loadDefaultBackgroundImage();
+                                } else {
+                                    image = new Image(config().getBackgroundImageUrl(), true);
+                                }
                             } else if (config().getBackgroundImageType() == EnumBackgroundImage.CLASSIC) {
                                 image = newImage("/assets/img/background-classic.jpg");
+                            } else if (config().getBackgroundImageType() == EnumBackgroundImage.TRANSLUCENT) {
+                                return new Background(new BackgroundFill(new Color(1, 1, 1, 0.5), CornerRadii.EMPTY, Insets.EMPTY));
                             }
                             if (image == null) {
                                 image = loadDefaultBackgroundImage();

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

@@ -102,6 +102,7 @@ public class PersonalizationPage extends StackPane {
             backgroundItem.loadChildren(Arrays.asList(
                     new MultiFileItem.Option<>(i18n("launcher.background.default"), EnumBackgroundImage.DEFAULT),
                     new MultiFileItem.Option<>(i18n("launcher.background.classic"), EnumBackgroundImage.CLASSIC),
+                    new MultiFileItem.Option<>(i18n("launcher.background.translucent"), EnumBackgroundImage.TRANSLUCENT),
                     new MultiFileItem.FileOption<>(i18n("settings.custom"), EnumBackgroundImage.CUSTOM)
                             .setChooserTitle(i18n("launcher.background.choose"))
                             .bindBidirectional(config().backgroundImageProperty()),

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

@@ -490,6 +490,7 @@ launcher.background.classic=Classic
 launcher.background.choose=Choose a background image file
 launcher.background.default=Standard
 launcher.background.network=Network
+launcher.background.translucent=Translucent
 launcher.cache_directory=Directory for caching
 launcher.cache_directory.clean=Clear
 launcher.cache_directory.choose=Choose the directory for caching

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

@@ -490,6 +490,7 @@ launcher.background.choose=選擇背景路徑
 launcher.background.classic=經典
 launcher.background.default=預設（自動尋找啟動器同目錄下的 background.png/jpg 及 bg 資料夾內的圖片）
 launcher.background.network=網路
+launcher.background.translucent=半透明
 launcher.cache_directory=檔案下載快取目錄
 launcher.cache_directory.clean=清理
 launcher.cache_directory.choose=選擇檔案下載快取目錄

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

@@ -490,6 +490,7 @@ launcher.background.choose=选择背景路径
 launcher.background.classic=经典
 launcher.background.default=默认（自动检索启动器同目录下的 background.png/jpg 及 bg 文件夹内的图片）
 launcher.background.network=网络
+launcher.background.translucent=半透明
 launcher.cache_directory=文件下载缓存目录
 launcher.cache_directory.clean=清理
 launcher.cache_directory.choose=选择文件下载缓存目录