在 Java Swing 应用程序中将未修饰的 Java JFrame 移到屏幕边界外

Question

我有一个未修饰的 JFram

setUndecorated(true);

，我在顶部有一个 JPanel

headerPanel

，我用它来单击并拖动以移动 JFrame。但是，当我移动它时，框架不会超出屏幕边界。如果我向右单击并拖动，当右侧到达屏幕的右边界时，框架停止移动。如果我

setUndecorated(false);

框架可以被拖到屏幕边界之外。

这是我在单击并拖动 JPanel 时如何移动 JFrame 的代码

headerPanel

：

    // Add mouse listener for headerPanel mb
    headerPanel.addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent me) {
            if (getExtendedState() == UIFrame.MAXIMIZED_BOTH) {
                //don't allow moving the frame when is it maximized
                return;
            }
            setCursor(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));
            // Get x,y and store them
            winLocationX = me.getX();
            winLocationY = me.getY();
        }
    });

    headerPanel.addMouseListener(new MouseAdapter() {
        @Override
        public void mouseReleased(MouseEvent me) {
            setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
        }
    });

    // Add MouseMotionListener for detecting drag
    headerPanel.addMouseMotionListener(new MouseAdapter() {
        @Override
        public void mouseDragged(MouseEvent me) {
            if (getExtendedState() == UIFrame.MAXIMIZED_BOTH) {
                //don't allow moving the frame when is it maximized
                return;
            }
            // get the current location x-co-ordinate and then get
            // the current drag x co-ordinate, add them and subtract most recent
            // mouse pressed x co-ordinate
            // do same for y co-ordinate
            setLocation(getLocation().x + me.getX() - winLocationX, getLocation().y + me.getY() - winLocationY);
        }
    });

我做错了什么不允许我将

JFrame

移到屏幕边界之外？