屏幕上任何位置的Java鼠标移动

屏幕上任何位置的Java鼠标移动

java.awt.event.MouseMotionListener

只会为您提供有关鼠标在应用程序窗口内移动的信息。对于在该窗口外发生的事件，没有办法解决

MouseInfo.getPointerInfo

。但是，您可以编写一个（可能是单例的）类，该类定期轮询指针信息并允许

MouseMotionListeners

添加：

import java.awt.Component;import java.awt.MouseInfo;import java.awt.Point;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.MouseEvent;import java.awt.event.MouseMotionListener;import java.util.HashSet;import java.util.Set;import javax.swing.Jframe;import javax.swing.SwingUtilities;import javax.swing.Timer;public class MouseObserver {        private static final int DELAY = 10;    private Component component;    private Timer timer;    private Set<MouseMotionListener> mouseMotionListeners;    protected MouseObserver(Component component) {        if (component == null) { throw new IllegalArgumentException("Null component not allowed.");        }        this.component = component;                timer = new Timer(DELAY, new ActionListener() {     private Point lastPoint = MouseInfo.getPointerInfo().getLocation();          public synchronized void actionPerformed(ActionEvent e) {         Point point = MouseInfo.getPointerInfo().getLocation();         if (!point.equals(lastPoint)) {  fireMouseMotionEvent(point);         }         lastPoint = point;     } });        mouseMotionListeners = new HashSet<MouseMotionListener>();    }    public Component getComponent() {        return component;    }    public void start() {        timer.start();    }    public void stop() {        timer.stop();    }    public void addMouseMotionListener(MouseMotionListener listener) {        synchronized (mouseMotionListeners) { mouseMotionListeners.add(listener);        }    }    public void removeMouseMotionListener(MouseMotionListener listener) {        synchronized (mouseMotionListeners) { mouseMotionListeners.remove(listener);        }    }    protected void fireMouseMotionEvent(Point point) {        synchronized (mouseMotionListeners) { for (final MouseMotionListener listener : mouseMotionListeners) {     final MouseEvent event =         new MouseEvent(component, MouseEvent.MOUSE_MOVED, System.currentTimeMillis(),  0, point.x, point.y, 0, false);     SwingUtilities.invokeLater(new Runnable() {  public void run() {      listener.mouseMoved(event);  }         }); }        }    }        public static void main(String[] args) {        Jframe main = new Jframe("dummy...");        main.setSize(100,100);        main.setVisible(true);        MouseObserver mo = new MouseObserver(main);        mo.addMouseMotionListener(new MouseMotionListener() {     public void mouseMoved(MouseEvent e) {         System.out.println("mouse moved: " + e.getPoint());     }     public void mouseDragged(MouseEvent e) {         System.out.println("mouse dragged: " + e.getPoint());     } });        mo.start();    }}

请注意，尽管与标准的MouseMotionListener有一些明显的不同：

• 您只会收到

  mouseMoved

  事件，不会收到

  mouseDragged

  事件。这是因为无法在主窗口之外接收有关单击的信息。
• 由于类似的原因，

  modifiers

  每个的

  MouseEvent

  始终为0。
• 这同样适用于价值观

  clickCount

  ，

  popupTrigger

  ，

  button

• 您将需要提供一个

  java.awt.Component

  将用作

  MouseEvent

  s （伪）源的虚拟对象-

  null

  此处不允许使用值。