从this question继续,我在我的MouseMotionListener
中实现JPanel
,以便我可以跟踪鼠标事件以传递给其中包含的对象。
这没有用,所以我用JPanel
实现了一个完全干净的MouseMotionListener
(我的游戏面板没有其他东西),但仍然没有工作。它只是设置在一个非常简单的JFrame
FlowLayout
。
我使用它错了吗?我打算如何触发鼠标事件?
JPanelMouseMotion
上课:
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import javax.swing.JPanel;
public class JPanelMouseMotion extends JPanel implements MouseMotionListener {
private static final long serialVersionUID = 1L;
public JPanelMouseMotion() {
super();
}
@Override
public void mouseDragged(MouseEvent e) {
}
@Override
public void mouseMoved(MouseEvent e) {
System.out.println(e.getX() + " / " + e.getY());
}
}
答案 0 :(得分:3)
永远不会调用侦听器,因为它从未注册过。您应该致电addMouseMotionListener
进行注册。
public class JPanelMouseMotion extends JPanel implements MouseMotionListener {
private static final long serialVersionUID = 1L;
public JPanelMouseMotion() {
super();
addMouseMotionListener(this); // register this JPanel as a Listener
}
@Override
public void mouseDragged(MouseEvent e) {
}
@Override
public void mouseMoved(MouseEvent e) {
System.out.println(e.getX() + " / " + e.getY());
}
}