Java - 在Swing中的mouseMoved（）事件处理

问题描述

我想在我的JFrame中收听鼠标移动和点击。为此，我添加了一个像这样实现的MouseListener：（View类的整个代码在，董事会职务类别位于）

I want to listen for mouse movements and clicks in my JFrame. To do this, I've added a MouseListener implemented like this: (whole code of View class is at https://gist.github.com/2837224, Board class is at https://gist.github.com/2837231)

class BattleshipsFrame extends JFrame {
  private final Board playerBoard, opponentBoard;
  private View view;

/** Main window constructor. */
BattleshipsFrame() {
  ...
  ...
  ...
  //creating and displaying boards
  playerBoard = new Board();
  opponentBoard = new Board();
  PlayerBoardListener mouseListener = new PlayerBoardListener();
  this.addMouseListener(mouseListener);
  playerBoard.addMouseListener(mouseListener);
  opponentBoard.addMouseListener(new OpponentBoardListener());
  boards.add(playerBoard);
  boards.add(opponentBoard);
  ...
  ...
  ...
}

/** Listener responsible for handling mouse events on player board */
private class PlayerBoardListener extends MouseAdapter {
  @Override public void mousePressed(MouseEvent event) {
    try {
      if(event.getButton() == MouseEvent.BUTTON1 && controllerConnection != null)
        controllerConnection.sendShipPlacedEvent(event.getX()/40, event.getY()/40, ShipType.EMPTY);
    } catch(Exception e) {
      e.printStackTrace();
    }
  }
  @Override public void mouseMoved(MouseEvent event) {
    //TODO
    System.out.println("Mouse movement detected! Actual mouse position is: " + event.getX()+ "," + event.getY() + ".");
  }
  @Override public void mouseDragged(MouseEvent event) {
    //TODO
    System.out.println("Mouse movement detected! Actual mouse position is: " + event.getX()+ "," + event.getY() + ".");
  }

}

有趣的是，mousePressed（）工作正常，但其他两个不是（移动鼠标时没有显示在控制台上）。有人可以告诉我我做错了什么？感谢提前！

Funny thing is that mousePressed() is working well, but the other two are not (nothing shows on console while moving the mouse). Anybody could tell me what am I doing wrong? Thanks in advance!

推荐答案

如果你想收到 mouseMoved code> mouseDragged 事件，您还需要注册您的监听器为。

If you want to receive mouseMoved and mouseDragged events, you need to also register your listener as a MouseMotionListener.

MouseAdapter adapter = ...
JFrame frame = ...
frame.addMouseListener(adapter);
frame.addMouseMotionListener(adapter);

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