Java - 在 Swing 中处理 mouseMoved() 事件
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Java - mouseMoved() event handling in Swing
提问by mc.suchecki
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)
我想在 JFrame 中监听鼠标移动和点击。为此，我添加了一个像这样实现的 MouseListener ：（View 类的完整代码位于https://gist.github.com/2837224，Board 类位于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() + ".");
}
}
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!
有趣的是 mousePressed() 运行良好，但其他两个运行良好（移动鼠标时控制台上没有任何显示）。谁能告诉我我做错了什么？提前致谢！
回答by Jeffrey
If you want to receive mouseMovedand mouseDraggedevents, you need to also register your listener as a MouseMotionListener.
如果要接收mouseMoved和mouseDragged事件，还需要将侦听器注册为MouseMotionListener.
MouseAdapter adapter = ...
JFrame frame = ...
frame.addMouseListener(adapter);
frame.addMouseMotionListener(adapter);
回答by Joe
Maybe you should try implementing MouseMotionListenerand with MouseListenertoo ?
也许您也应该尝试实施MouseMotionListenerand with MouseListener？
