未触发 JPopupMenu 操作

Question

这是我所拥有的（简化版）。（我是这样找到代码的）：

class CustomPopup extends JPopupMenu {
    public CustomPopup() {}

    @Override
    public void setVisible(boolean visible)
    {
        // Case 1:
        //if (visible) super.setVisible(visible);
        // Case 2:
        super.setVisible(visible);
    }
}

class CustomPanel extends JPanel {
    // .../...
    public CustomPanel() {
        setSize(200, 200);
        addMouseListener( new MouseAdapter(){
            @Override
            public void mousePressed( MouseEvent e ){
                onMousePressed( e );
            }
        });

    }

    public void onMousePressed( MouseEvent e )
    {
        JPopupMenu pop = new JPopupMenu();

        pop.add( new AbstractAction( "foo" )
        {
            @Override
            public void actionPerformed( ActionEvent e )
            {
                // do stuff
                System.out.println("this is executed");
            }
        });
        pop.show( e.getComponent(), e.getX(), e.getY() );
    }
}

public class TestPopup extends JFrame {
    CustomPanel _pp;
    CustomPopup _cpop;

    public TestPopup () {
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setSize(333, 333);
        _cpop = new CustomPopup();
        _pp = new CustomPanel();
        _cpop.add(_pp);

        addMouseListener( new MouseAdapter(){
            @Override
            public void mousePressed( MouseEvent e ){
                _cpop.show(e.getComponent(), 0, 0);
            }
        });
    }
    public static void main(String[] args) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                (new TestPopup()).setVisible(true);
            }
        });
    }
}

弹出菜单显示自定义面板。与它交互时，它会显示带有选项列表的经典弹出菜单。

我的问题是 CustomPopup 没有按预期自行关闭。罪魁祸首显然是 setVisible 的覆盖，但是如果我删除覆盖方法（或注释掉条件），我会遇到另一个问题：永远不会调用添加到 pop 上的 actionPerformed 方法。

第一种情况：

CustomPopup 打开
我点击里面的东西
JPopupMenu 打开 并且 CustomPopup 保持可见
我点击了新菜单的一个项目
触发Action

第二种情况：

CustomPopup 打开
我点击里面的东西
JPopupMenu打开，CustomPopup隐藏
我点击了新菜单的一个项目
Action未触发

我的结论是 CustomPopup 必须可见才能触发操作，即使我真的不明白为什么。所以我的问题是：如何以不破坏默认 JPopupMenu 行为的方式保持 CustomPopup 打开，或者如何在隐藏 CustomPopup 的情况下正确触发操作？

Answer 1

看起来弹出窗口的父级必须可见才能触发操作（对我来说听起来很合理）。所以除了最后一步之外，你已经做了所有让它工作的事情：自己关闭自定义弹出窗口。这是代码：

class CustomPopup extends JPopupMenu {
    public CustomPopup() {}

    @Override
    public void setVisible(boolean visible)
    {
        // Case 1:
        if (visible) super.setVisible(visible);
        // Case 2:
//        super.setVisible(visible);
    }
    public void makeInvisible() {
        super.setVisible(false);
    }
}

class CustomPanel extends JPanel {
    // .../...
    public CustomPanel() {
        setSize(200, 200);
        addMouseListener( new MouseAdapter(){
            @Override
            public void mousePressed( MouseEvent e ){
                onMousePressed( e );
            }
        });

    }

    public void onMousePressed( MouseEvent e )
    {
        JPopupMenu pop = new JPopupMenu();

        pop.add( new AbstractAction( "foo" )
        {
            @Override
            public void actionPerformed( ActionEvent e )
            {
                // do stuff
                System.out.println("this is executed");
                Component comp = (Component) e.getSource();
                if (comp != null && comp.getParent() instanceof JPopupMenu) {
                    JPopupMenu popupMenu = (JPopupMenu) comp.getParent();
                    if (popupMenu.getInvoker() instanceof CustomPanel) {
                        CustomPopup cpop = (CustomPopup) popupMenu.getInvoker().getParent();
                        cpop.makeInvisible();
                    }
                }
            }
        });
        pop.show( e.getComponent(), e.getX(), e.getY() );
    }
}

public class TestPopup extends JFrame {
    CustomPanel _pp;
    CustomPopup _cpop;

    public TestPopup () {
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setSize(333, 333);
        _cpop = new CustomPopup();
        _pp = new CustomPanel();
        _cpop.add(_pp);

        addMouseListener( new MouseAdapter(){
            @Override
            public void mousePressed( MouseEvent e ){
                _cpop.show(e.getComponent(), e.getX(), e.getY());
            }
        });
    }
    public static void main(String[] args) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                (new TestPopup()).setVisible(true);
            }
        });
    }
}

未触发 JPopupMenu 操作

JPopupMenu action not triggered

java

swing

popupmenu