Java中的关闭窗口（JPanel） [英] Close Window (JPanel) in Java

问题描述

我添加了一个添加到JPanel的JTabbedPane的Button，其中包含以下内容：

I have a Button added to a JTabbedPane added to a JPanel with something like this:

JTabbedPane tabbedPane = new JTabbedPane();
JButton btnClose = new JButton("Close");
JComponent panel.add(btnClose);
tabbedPane.addTab("Test", panel);

我想关闭按钮上的窗口。我试过这样做：

I want to close the window on the button press. I tried do this:

btnClose.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                panel.dispatchEvent(new WindowEvent(frame, WindowEvent.WINDOW_CLOSING));
            }
        });

但它给了我

 Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: null source

如何关闭按钮上的窗口按

How do I close the Window on Button Press

推荐答案

获取顶级窗口：

public void actionPerformed(ActionEvent e) {
  JComponent comp = (JComponent) e.getSource();
  Window win = SwingUtilities.getWindowAncestor(comp);
  win.dispose();
}

确保JFrame的默认关闭操作已设置为 JFrame.DISPOSE_ON_CLOSE （首选）或 JFrame.EXIT_ON_CLOSE （不是首选）。

Make sure that the JFrame's default close operation has been set to JFrame.DISPOSE_ON_CLOSE (preferred) OR JFrame.EXIT_ON_CLOSE (not preferred).

如果有可能从JMenuItem调用它，那么除非你首先测试comp的父级是JPopupMenu还是JToolBar，否则它将无法工作。如果是这样，那么您应该使用更强大的解决方案，例如可以在 java-swing-tips ，特别是这段代码：

If there is ever a chance that this will be called from a JMenuItem, then it will not work unless you first test if the comp's parent is either a JPopupMenu or a JToolBar. If so, then you should use a more robust solution such as can be found at java-swing-tips, specifically this code:

class ExitAction extends AbstractAction {
    public ExitAction() {
        super("Exit");
    }
    @Override public void actionPerformed(ActionEvent e) {
        JComponent c = (JComponent) e.getSource();
        Window window = null;
        Container parent = c.getParent();
        if (parent instanceof JPopupMenu) {
            JPopupMenu popup = (JPopupMenu) parent;
            JComponent invoker = (JComponent) popup.getInvoker();
            window = SwingUtilities.getWindowAncestor(invoker);
        } else if (parent instanceof JToolBar) {
            JToolBar toolbar = (JToolBar) parent;
            if (((BasicToolBarUI) toolbar.getUI()).isFloating()) {
                window = SwingUtilities.getWindowAncestor(toolbar).getOwner();
            } else {
                window = SwingUtilities.getWindowAncestor(toolbar);
            }
        } else {
            Component invoker = c.getParent();
            window = SwingUtilities.getWindowAncestor(invoker);
        }
        if (window != null) {
            //window.dispose();
            window.dispatchEvent(new WindowEvent(window, WindowEvent.WINDOW_CLOSING));
        }
    }
}

来源： WindowClosingAction

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