Java 键绑定(bind)到相同的操作

Question

我试图通过使用通用 Action 来减少处理键盘按下/释放所需的代码量，同时仍然使用 InputMap/ActionMap 范例(需要单独的按下/释放信息)。

我要解决的问题是如何从ActionEvent中获取keyPressed/keyReleased信息。

    KeyStroke rKeyStrokeReleased = KeyStroke.getKeyStroke(KeyEvent.VK_R,
            0, true);
    KeyStroke rKeyStrokePressed = KeyStroke.getKeyStroke(KeyEvent.VK_R,
            0, false);

    Action rAction = new AbstractAction() {
        public void actionPerformed(ActionEvent e) {
            // How do I get the pressed/release information here?
            System.out.println(e);
        }
    };

    getRootPane().getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(
            rKeyStrokeReleased, "R_RELEASED");
    getRootPane().getActionMap().put("R_RELEASED", rAction );

    getRootPane().getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(
            rKeyStrokePressed, "R_PRESSED");
    getRootPane().getActionMap().put("R_PRESSED", rAction);

Answer 1

how to get the keyPressed/keyReleased information from the ActionEvent.

您无法从 ActionEvent 中获取信息。

您可以从EventQueue中获取信息:

EventQueue queue = Toolkit.getDefaultToolkit().getSystemEventQueue();
AWTEvent event = queue.getCurrentEvent();
System.out.println(event.getID());