Question

我创建了3个面板。在根面板中，我添加了JTabbedPane，在其中一个标签中添加了第二个Panel BorderLayout，最后添加到BorderLayout.WEST第三个标签中。在第3个内部，我添加了JTree PopupMenu。

如何让根面板进入PopupMenu的行动？

menuItem.addActionListener(new AbstractAction() {
    public void actionPerformed(ActionEvent e) {
        System.out.println("one:"+tree.getParent().getName());
        System.out.println("two:"+tree.getParent().getParent().getName());
        System.out.println("three:"+tree.getParent().getParent().getParent().getName());
        new UnzipFile(file, file.getParentFile(),
        (rootPanel) tree.getParent().getParent().getParent() ).run();
    }
});

输出：

Exception in thread "AWT-EventQueue-1" java.lang.ClassCastException: de.util.scanners.view.FileTreePanel
at de.util.scanners.view.FileTreePanel$2$1.actionPerformed(FileTreePanel.java:109)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
at javax.swing.AbstractButton.doClick(AbstractButton.java:302)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1050)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1091)
at java.awt.Component.processMouseEvent(Component.java:5517)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3129)
at java.awt.Component.processEvent(Component.java:5282)
at java.awt.Container.processEvent(Container.java:1966)
at java.awt.Component.dispatchEventImpl(Component.java:3984)
at java.awt.Container.dispatchEventImpl(Container.java:2024)
at java.awt.Component.dispatchEvent(Component.java:3819)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)
one:null
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
two:null
three:null
at java.awt.Container.dispatchEventImpl(Container.java:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1791)
at java.awt.Component.dispatchEvent(Component.java:3819)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at be.azvub.webutil.gui.WebEventQueue.dispatchEvent(WebEventQueue.java:34)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

Answer 1

您可以使用SwingUtilities.getAncestorOfClass方法。

Answer 2

我认为让父母链试图查找特定组件来更新它并不是一个好主意。如果您想将JTree放在其他位置，或者只是重新构建布局，该怎么办？你将被迫改变所有这些。

您可以尝试使用MVC。 JTree向Controller发送一个事件，该事件将具有到JTree本身和根窗格的接口。实例化控制器时，将所有视图作为控制器的协作者传递。

我不知道你的面板在哪里被实例化。但是如果你在根级别实例化你的控制器应该很容易获得你需要的所有组件的引用。

如何在java中获取父面板？

2 个答案: