如何在 Java/Swing 中实现 Ctrl+Z/Command+Z？
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How do I implement Ctrl+Z / Command+Z in Java/Swing?
提问by Neal Ehardt
I'm working on a little Java applet that needs undo/redo functionality. Here's code to set up the hotkeys (works great on Windows).
我正在开发一个需要撤消/重做功能的小 Java 小程序。这是设置热键的代码（在 Windows 上效果很好）。
My question is: how do I make it use command+Z on mac? Should I just check System.getProperty("os.name") or is there a more elegant alternative??
我的问题是：如何让它在 mac 上使用 command+Z？我应该检查 System.getProperty("os.name") 还是有更优雅的选择？
private void setupUndoHotkeys() {
String UNDO = "Undo action key";
String REDO = "Redo action key";
Action undoAction = new AbstractAction() {
public void actionPerformed(ActionEvent e) {
undo();
}
};
Action redoAction = new AbstractAction() {
public void actionPerformed(ActionEvent e) {
redo();
}
};
getActionMap().put(UNDO, undoAction);
getActionMap().put(REDO, redoAction);
InputMap[] inputMaps = new InputMap[] {
getInputMap(JComponent.WHEN_FOCUSED),
getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT),
getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW),
};
for(InputMap i : inputMaps) {
i.put(KeyStroke.getKeyStroke("control Z"), UNDO);
i.put(KeyStroke.getKeyStroke("control Y"), REDO);
}
}
Thanks,
谢谢，
Neal
尼尔
回答by Neal Ehardt
Ah nevermind, I found it here http://www.devdaily.com/blog/post/jfc-swing/how-program-apple-command-key-keystroke-java-swing-mac-osx
啊没关系，我在这里找到它http://www.devdaily.com/blog/post/jfc-swing/how-program-apple-command-key-keystroke-java-swing-mac-osx
This should be undo on any platform.
这应该在任何平台上撤消。
KeyStroke.getKeyStroke(KeyEvent.VK_Z, Toolkit.getDefaultToolkit().getMenuShortcutKeyMask())
