如何在JDesktopPane中获取JInternalFrame的z顺序

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问题描述

如何获得JDesktopPane中所有JInternalFrame的z顺序（图层深度）。似乎没有直接的方式。有什么想法吗？

How would one go about getting the z order (layer depth of ) all the JInternalFrames inside a JDesktopPane. There does not seem to be a straight forward way for this. Any ideas?

推荐答案

虽然我没试过这个，但类（它的祖先是 class）包含方法。通过，它位于容器中，它将返回z-order为 int 。具有该方法返回的最低z顺序值的组件最后绘制，换句话说，绘制在顶部。

Although I haven't tried this, the Container class (which is an ancestor of the JDesktopPane class) contains a getComponentZOrder method. By passing a Component which is in the Container, it will return the z-order of as an int. The Component with the lowest z-order value returned by the method is drawn last, in other words, is drawn on top.

与方法，返回，我认为可以获得内部帧的z顺序。

Coupling with the JDesktopPane.getAllFrames method, which returns an array of JInternalFrames, I would think that one could obtain the z-order of the internal frames.

编辑

我实际上尝试过它似乎有效：

I've actually tried it out and it seems to work:

final JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

final JDesktopPane desktopPane = new JDesktopPane();
desktopPane.add(new JInternalFrame("1") {
    {
        setVisible(true);
        setSize(100, 100);
    }
});
desktopPane.add(new JInternalFrame("2") {
    {
        setVisible(true);
        setSize(100, 100);
    }
});
desktopPane.add(new JInternalFrame("3") {
    JButton b = new JButton("Get z-order");
    {
        setVisible(true);
        setSize(100, 100);
        getContentPane().add(b);
        b.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e)
            {
                JInternalFrame[] iframes = desktopPane.getAllFrames();
                for (JInternalFrame iframe : iframes)
                {
                    System.out.println(iframe + "\t" +
                            desktopPane.getComponentZOrder(iframe));
                }
            }
        });
    }
});

f.setContentPane(desktopPane);
f.setLocation(100, 100);
f.setSize(400, 400);
f.validate();
f.setVisible(true);

在上面的示例中， JDesktopPane 是填充了三个 JInternalFrame s，第三个有一个按钮，它将输出一个 JInternalFrame 列表及其z-订购 System.out 。

In the above example, a JDesktopPane is populated with three JInternalFrames with the third one having a button which will output a list of JInternalFrames and its z-order to System.out.

示例输出如下：

JDesktopPaneTest$3[... tons of info on the frame ...]    0
JDesktopPaneTest$2[... tons of info on the frame ...]    1
JDesktopPaneTest$1[... tons of info on the frame ...]    2

该示例使用了许多匿名内部类来保持代码简短，但实际程序可能不应该这样做。

The example uses a lot of anonymous inner classes just to keep the code short, but an actual program probably should not do that.

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