我正在尝试编写包含Mouse
和MouseListener
的MouseMotionListener
类(实现mousePressed()
和mouseMoved()
)。我希望能够在鼠标按下时检测到鼠标的运动。我可以分别检测每个,但不能同时检测。例如:
import javax.swing.*;
import java.awt.event.*;
public class Test extends JPanel {
public Test() {
Mouse m = new Mouse();
addMouseListener(m);
addMouseMotionListener(m);
}
class Mouse implements MouseListener, MouseMotionListener{
public void mousePressed(MouseEvent e) {
System.out.println("Pressed");
}
public void mouseMoved(MouseEvent e) {
System.out.println("Moved");
}
public void mouseDragged(MouseEvent e) {}
public void mouseClicked(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
}
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setSize(500, 500);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setContentPane(new Test());
frame.setVisible(true);
}
}
如您所见,“ Pressed”和“ Moved”都被打印出来,但是一旦按下鼠标,在释放鼠标之前就不会打印“ Moved”。我将如何做到这一点呢?
最佳答案
From the Java API:
void mouseDragged(MouseEvent e)
在组件上按下鼠标按钮并拖动时调用。
void mouseMoved(MouseEvent e)
当鼠标光标移到组件上但未按下任何按钮时调用。
仅当未按下任何按钮时才会触发mouseMoved
事件。