javafx-2 - 如何拖动JavaFX的未修饰窗口(阶段)

Question

我有这个未修饰的窗口：

public static void initStartPage(final Stage primaryStage) {

        final Stage startPage = new Stage();
        startPage.initStyle(StageStyle.UNDECORATED);
        //startPage.initOwner(primaryStage);
        //startPage.toFront();
        Scene scene = new Scene(agentsPanel(), 900, 500);
        startPage.setScene(scene);
        startPage.show();

    }

我想知道如何使其成为可拖动的未修饰窗口？
当用户使用鼠标右键选择窗口，然后在按住鼠标按钮的同时移动鼠标时，我想更改其位置。

附言我测试了此解决方案，但无法正常工作：

private static FlowPane flow;
    private static BorderPane bpi;

    public static void initStartPage(final Stage primaryStage) {

        final Stage startPage = new Stage();
        startPage.initStyle(StageStyle.UNDECORATED);
        startPage.initOwner(primaryStage);
        //startPage.toFront();
        Scene scene = new Scene(agentsPanel(primaryStage), 900, 500);
        startPage.setScene(scene);
        startPage.show();

    }

    private static double xOffset = 0;
    private static double yOffset = 0;

    public static BorderPane agentsPanel(final Stage primaryStage) {

        BorderPane bp = new BorderPane();
        bp.setPrefSize(900, 500);
        bp.setMaxSize(900, 500);

        HBox thb = new HBox(10); // Set spacing between each child into the HBox
        thb.setPadding(new Insets(15, 15, 15, 15));


        HBox bhb = new HBox(10); // Set spacing between each child into the HBox
        bhb.setPadding(new Insets(15, 15, 15, 15));

        bp.setTop(thb);
        bp.setBottom(bhb);
        bp.setCenter(navigationPanel());


        bp.setOnMousePressed(new EventHandler<MouseEvent>() {
            @Override
            public void handle(MouseEvent event) {
                xOffset = event.getSceneX();
                yOffset = event.getSceneY();
            }
        });
        bp.setOnMouseDragged(new EventHandler<MouseEvent>() {
            @Override
            public void handle(MouseEvent event) {
                primaryStage.setX(event.getScreenX() - xOffset);
                primaryStage.setY(event.getScreenY() - yOffset);
            }
        });

        return bp;

    }

Answer 1

只需将setOnMousePressed方法更改为此：

bp.setOnMousePressed(new EventHandler<MouseEvent>() {
            @Override
            public void handle(MouseEvent event) {
                xOffset = primaryStage.getX() - event.getScreenX();
                yOffset = primaryStage.getY() - event.getScreenY();
            }
        });

和您的setOnMouseDragged到此：

bp.setOnMouseDragged(new EventHandler<MouseEvent>() {
            @Override
            public void handle(MouseEvent event) {
                primaryStage.setX(event.getScreenX() + xOffset);
                primaryStage.setY(event.getScreenY() + yOffset);
            }
        });