Swing:按下ESC键时如何关闭对话框? [英] Swing: how do I close a dialog when the ESC key is pressed?

问题描述

使用Swing开发GUI.

GUI development with Swing.

我有一个自定义对话框，用于选择要在我的应用程序中打开的文件；它的类扩展了 javax.swing.JDialog ，并包含一个 JFileChooser ，可以将其切换为显示或隐藏.

I have a custom dialog for choosing a file to be opened in my application; its class extends javax.swing.JDialog and contains, among other components, a JFileChooser, which can be toggled to be shown or hidden.

JFileChooser 组件已经可以单独处理ESC键:当显示文件选择器(嵌入在我的对话框中)并且按ESC时，文件选择器将隐藏自身.

The JFileChooser component already handles the ESC key by itself: when the file chooser is shown (embedded in my dialog) and I press ESC, the file chooser hides itself.

现在，我希望对话框执行相同操作:当我按ESC时，我希望对话框关闭.请注意，当显示嵌入式文件选择器时，按ESC键只能将其隐藏.

Now I would like my dialog to do the same: when I press ESC, I want the dialog to close. Mind you, when the embedded file chooser is shown, the ESC key should only hide it.

有什么想法吗?

推荐答案

使用 InputMap 和 ActionMap 处理Swing中的关键动作.要干净地关闭对话框，请向其发送一个关闭窗口事件.

Use InputMap and ActionMap for dealing with key actions in Swing. To close the dialog cleanly, send a window closing event to it.

从我的博客:

private static final KeyStroke escapeStroke = 
    KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0); 
public static final String dispatchWindowClosingActionMapKey = 
    "com.spodding.tackline.dispatch:WINDOW_CLOSING"; 
public static void installEscapeCloseOperation(final JDialog dialog) { 
    Action dispatchClosing = new AbstractAction() { 
        public void actionPerformed(ActionEvent event) { 
            dialog.dispatchEvent(new WindowEvent( 
                dialog, WindowEvent.WINDOW_CLOSING 
            )); 
        } 
    }; 
    JRootPane root = dialog.getRootPane(); 
    root.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put( 
        escapeStroke, dispatchWindowClosingActionMapKey 
    ); 
    root.getActionMap().put( dispatchWindowClosingActionMapKey, dispatchClosing 
    ); 
}

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