alt: allow dragging window when a dialog is shown

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

@@ -17,6 +17,7 @@
  */
 package org.jackhuang.hmcl.ui.decorator;
 
+import com.jfoenix.controls.JFXDialog;
 import javafx.beans.property.*;
 import javafx.collections.FXCollections;
 import javafx.collections.ObservableList;
@@ -46,7 +47,7 @@ public class Decorator extends Control {
     private final BooleanProperty canClose = new SimpleBooleanProperty(false);
     private final BooleanProperty showCloseAsHome = new SimpleBooleanProperty(false);
     private final Stage primaryStage;
-    private StackPane drawerWrapper;
+    private JFXDialog dialog;
 
     public Decorator(Stage primaryStage) {
         this.primaryStage = primaryStage;
@@ -58,12 +59,12 @@ public class Decorator extends Control {
         return primaryStage;
     }
 
-    public StackPane getDrawerWrapper() {
-        return drawerWrapper;
+    public JFXDialog getDialog() {
+        return dialog;
     }
 
-    void setDrawerWrapper(StackPane drawerWrapper) {
-        this.drawerWrapper = drawerWrapper;
+    void setDialog(JFXDialog dialog) {
+        this.dialog = dialog;
     }
 
     public ObservableList<Node> getDrawer() {

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

@@ -72,7 +72,6 @@ public class DecoratorController {
     private final ImageView welcomeView;
     private final Navigator navigator;
 
-    private JFXDialog dialog;
     private StackContainerPane dialogPane;
 
     public DecoratorController(Stage stage, Node mainPage) {
@@ -294,23 +293,21 @@ public class DecoratorController {
     public void showDialog(Node node) {
         FXUtils.checkFxUserThread();
 
-        if (dialog == null) {
-            if (decorator.getDrawerWrapper() == null) {
-                // Sometimes showDialog will be invoked before decorator was initialized.
-                // Keep trying again.
-                Platform.runLater(() -> showDialog(node));
-                return;
-            }
-
-            dialog = new JFXDialog();
-            dialogPane = new StackContainerPane();
-
-            dialog.setContent(dialogPane);
-            dialog.setDialogContainer(decorator.getDrawerWrapper());
-            dialog.setOverlayClose(false);
-            dialog.show();
+        if (decorator.getDialog() == null) {
+            // Sometimes showDialog will be invoked before decorator was initialized.
+            // Keep trying again.
+            Platform.runLater(() -> showDialog(node));
+            return;
         }
 
+        if (dialogPane == null) {
+            dialogPane = new StackContainerPane();
+            decorator.getDialog().setContent(dialogPane);
+        }
+
+        if (dialogPane.isEmpty())
+            decorator.getDialog().show();
+
         dialogPane.push(node);
 
         EventHandler<DialogCloseEvent> handler = event -> closeDialog(node);
@@ -319,10 +316,10 @@ public class DecoratorController {
 
         if (node instanceof DialogAware) {
             DialogAware dialogAware = (DialogAware) node;
-            if (dialog.isVisible()) {
+            if (decorator.getDialog().isVisible()) {
                 dialogAware.onDialogShown();
             } else {
-                dialog.visibleProperty().addListener(new ChangeListener<Boolean>() {
+                decorator.getDialog().visibleProperty().addListener(new ChangeListener<Boolean>() {
                     @Override
                     public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {
                         if (newValue) {
@@ -342,13 +339,11 @@ public class DecoratorController {
         Optional.ofNullable(node.getProperties().get(PROPERTY_DIALOG_CLOSE_HANDLER))
                 .ifPresent(handler -> node.removeEventHandler(DialogCloseEvent.CLOSE, (EventHandler<DialogCloseEvent>) handler));
 
-        if (dialog != null) {
+        if (decorator.getDialog() != null) {
             dialogPane.pop(node);
 
             if (dialogPane.getChildren().isEmpty()) {
-                dialog.close();
-                dialog = null;
-                dialogPane = null;
+                decorator.getDialog().close();
             }
         }
     }

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

@@ -18,6 +18,7 @@
 package org.jackhuang.hmcl.ui.decorator;
 
 import com.jfoenix.controls.JFXButton;
+import com.jfoenix.controls.JFXDialog;
 import com.jfoenix.svg.SVGGlyph;
 import javafx.beans.binding.Bindings;
 import javafx.collections.ListChangeListener;
@@ -97,7 +98,17 @@ public class DecoratorSkin extends SkinBase<Decorator> {
         BorderPane root = new BorderPane();
         root.getStyleClass().addAll("jfx-decorator");
         wrapper.getChildren().setAll(root);
-        skinnable.setDrawerWrapper(wrapper);
+
+        JFXDialog dialog = new JFXDialog();
+        dialog.setDialogContainer(wrapper);
+        dialog.setOverlayClose(false);
+        dialog.addEventHandler(MouseEvent.MOUSE_ENTERED, e -> allowMove = true);
+        dialog.addEventHandler(MouseEvent.MOUSE_EXITED, e -> {
+            if (!isDragging) allowMove = false;
+        });
+
+        skinnable.setDialog(dialog);
+
         parent.getChildren().add(wrapper);
 
         // center node with a animation layer at bottom, a container layer at middle and a "welcome" layer at top.