应用程序范围的键盘快捷键 - Java Swing
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Application wide keyboard shortcut - Java Swing
提问by Louis Jacomet
I would like to create an application wide keyboard shortcut for a Java Swing application. Looping over all components and adding the shortcut on each, has focus related side effects, and seems like a brute force solution.
我想为 Java Swing 应用程序创建一个应用程序范围的键盘快捷键。循环所有组件并在每个组件上添加快捷方式，具有与焦点相关的副作用，并且似乎是一种蛮力解决方案。
Anyone has a cleaner solution?
有人有更清洁的解决方案吗？
采纳答案by Karl
Install a custom KeyEventDispatcher. The KeyboardFocusManager class is also a good place for this functionality.
安装自定义 KeyEventDispatcher。KeyboardFocusManager 类也是实现此功能的好地方。
回答by Tom Hawtin - tackline
For each window, use JComponent.registerKeyboardActionwith a condition of WHEN_IN_FOCUSED_WINDOW. Alternatively use:
对于每个窗口，使用JComponent.registerKeyboardAction条件为WHEN_IN_FOCUSED_WINDOW。或者使用：
JComponent.getInputMap(WHEN_IN_FOCUSED_WINDOW).put(keyStroke, command);
JComponent.getActionMap().put(command,action);
as described in the registerKeyboardAction API docs.
回答by daniel kullmann
When you have a menu, you can add global keyboard shortcuts to menu items:
当您有菜单时，您可以向菜单项添加全局键盘快捷键：
JMenuItem item = new JMenuItem(action);
KeyStroke key = KeyStroke.getKeyStroke(
KeyEvent.VK_R, KeyEvent.CTRL_DOWN_MASK);
item.setAccelerator(key);
menu.add(item);
回答by daniel kullmann
For people wondering (like me) how to use KeyEventDispatcher, here is an example that I put together. It uses a HashMap for storing all global actions, because I don't like large if (key == ..) then .. else if (key == ..) then .. else if (key ==..) ..constructs.
对于想知道（像我一样）如何使用 KeyEventDispatcher 的人，这是我放在一起的一个示例。它使用 HashMap 来存储所有全局操作，因为我不喜欢大型if (key == ..) then .. else if (key == ..) then .. else if (key ==..) ..构造。
/** map containing all global actions */
private HashMap<KeyStroke, Action> actionMap = new HashMap<KeyStroke, Action>();
/** call this somewhere in your GUI construction */
private void setup() {
KeyStroke key1 = KeyStroke.getKeyStroke(KeyEvent.VK_A, KeyEvent.CTRL_DOWN_MASK);
actionMap.put(key1, new AbstractAction("action1") {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("Ctrl-A pressed: " + e);
}
});
// add more actions..
KeyboardFocusManager kfm = KeyboardFocusManager.getCurrentKeyboardFocusManager();
kfm.addKeyEventDispatcher( new KeyEventDispatcher() {
@Override
public boolean dispatchKeyEvent(KeyEvent e) {
KeyStroke keyStroke = KeyStroke.getKeyStrokeForEvent(e);
if ( actionMap.containsKey(keyStroke) ) {
final Action a = actionMap.get(keyStroke);
final ActionEvent ae = new ActionEvent(e.getSource(), e.getID(), null );
SwingUtilities.invokeLater( new Runnable() {
@Override
public void run() {
a.actionPerformed(ae);
}
} );
return true;
}
return false;
}
});
}
The use of SwingUtils.invokeLater() is maybe not necessary, but it is probably a good idea not to block the global event loop.
SwingUtils.invokeLater() 的使用可能不是必需的，但最好不要阻塞全局事件循环。
回答by JavaTechnical
Use the following piece of code
使用下面的一段代码
ActionListener a=new ActionListener(){
public void actionPerformed(ActionEvent ae)
{
// your code
}
};
getRootPane().registerKeyboardAction(a,KeyStroke.getKeyStroke("ctrl D"),JComponent.WHEN_IN_FOCUSED_WINDOW);
Replace "ctrl D" with the shortcut you want.
用你想要的快捷方式替换“ctrl D”。
回答by mortalis
A little simplified example:
一个简单的例子：
KeyboardFocusManager keyManager;
keyManager=KeyboardFocusManager.getCurrentKeyboardFocusManager();
keyManager.addKeyEventDispatcher(new KeyEventDispatcher() {
@Override
public boolean dispatchKeyEvent(KeyEvent e) {
if(e.getID()==KeyEvent.KEY_PRESSED && e.getKeyCode()==27){
System.out.println("Esc");
return true;
}
return false;
}
});
