Question

我正在尝试进行密钥绑定。我想生成一个KeyStroke，只有在控制键被按下时才会执行操作。我不明白我做错了什么我使用相同的技术进行其他键绑定（Control + up，Control + down，up，c，p和其他按钮），我尝试过使用CTRL_DOWN_MASK，CTRL_MASK ，VK_CONTROL和“CONTROL”，但这些似乎都不起作用。我知道它不是我绑定它的方法，因为当我有两个其他键绑定到该操作（Control + Z）时，它工作但我想将它绑定到（Control）这里是我正在使用的代码。如果可以，请帮忙。

InputMap imap = leftPanel.getInputMap(mapName);
KeyStroke leftArrowKey = KeyStroke.getKeyStroke("LEFT");
imap.put(leftArrowKey, "left");
KeyStroke rightArrowKey = KeyStroke.getKeyStroke("RIGHT");
imap.put(rightArrowKey, "right");
KeyStroke upArrowKey = KeyStroke.getKeyStroke("UP");
imap.put(upArrowKey, "up");
KeyStroke cKey = KeyStroke.getKeyStroke('c');
imap.put(cKey, "c");
KeyStroke spaceKey = KeyStroke.getKeyStroke("SPACE");
imap.put(spaceKey, "space");
KeyStroke zoomInKeys = KeyStroke.getKeyStroke(VK_DOWN, CTRL_DOWN_MASK);
imap.put(zoomInKeys, "zoomin");
KeyStroke zoomOutKeys = KeyStroke.getKeyStroke(VK_UP, CTRL_DOWN_MASK);
imap.put(zoomOutKeys, "zoomout");
KeyStroke panKeys = KeyStroke.getKeyStroke("CONTROL");
imap.put(panKeys, "pan");

ActionMap amap = leftPanel.getActionMap();
amap.put("left", moveLeft);
amap.put("right", moveRight);
amap.put("up", increaseSpeed);
amap.put("c", changePaddleMode);
amap.put("space", nextBall);
amap.put("zoomin", zoomIn);
amap.put("zoomout", zoomOut);
amap.put("pan", pan);

问题在最后一个KeyStroke（panKeys）中弹出我不知道在getKeyStroke（）方法中放入什么会使它响应被按下的控制键。

Answer 1

这似乎对我有用：

public static void main(String[] args) {

  JLabel label = new JLabel("Foo");
  int condition = JLabel.WHEN_IN_FOCUSED_WINDOW;
  InputMap inputmap = label.getInputMap(condition);
  ActionMap actionmap = label.getActionMap();

  // first to test that this works.
  final String xKeyPressed = "x key pressed";
  inputmap.put(KeyStroke.getKeyStroke(KeyEvent.VK_X, 0), xKeyPressed );
  actionmap.put(xKeyPressed, new AbstractAction() {

     @Override
     public void actionPerformed(ActionEvent arg0) {
        System.out.println(xKeyPressed);
     }
  });

  // Next to try it with just the control key
  final String controlKeyPressed = "control key pressed";
  inputmap.put(KeyStroke.getKeyStroke(KeyEvent.VK_CONTROL, 
          KeyEvent.CTRL_DOWN_MASK), controlKeyPressed );
  actionmap.put(controlKeyPressed, new AbstractAction() {

     @Override
     public void actionPerformed(ActionEvent arg0) {
        System.out.println(controlKeyPressed);
     }
  });
  JOptionPane.showMessageDialog(null, label);
}

为按住控制按钮生成KeyStroke

1 个答案: