爪哇鼠标移动屏幕上的任何地方
问题描述:
我敢肯定这是可能的,但我所有的搜索都是空白的。爪哇鼠标移动屏幕上的任何地方
在Java中,是否可以在Java应用程序之外注册鼠标移动事件?因此,如果鼠标指针移动到屏幕上的任何位置,我都会收到回电。可以用轮询MouseInfo.getPointerInfo
进行近似,但是必须有更好的方法。
感谢
为了说明用例: 这只是一个宠物项目,但基本上触发事件,当鼠标点击屏幕的边缘。我也在想,如果你尝试推过屏幕边缘,可能会触发不同的事件。为此,我认为鼠标移动侦听器可能更合适。
答
java.awt.event.MouseMotionListener
只会给你提供关于应用程序窗口内鼠标移动的信息。对于在该窗口之外发生的事件,无法绕过MouseInfo.getPointerInfo
。然而,你可以写一个(潜在单)类轮询定期的指针信息,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;
/**
* This class checks the position every #DELAY milliseconds and
* informs all registered MouseMotionListeners about position updates.
*/
public class MouseObserver {
/* the resolution of the mouse motion */
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;
/* poll mouse coordinates at the given rate */
timer = new Timer(DELAY, new ActionListener() {
private Point lastPoint = MouseInfo.getPointerInfo().getLocation();
/* called every DELAY milliseconds to fetch the
* current mouse coordinates */
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);
}
});
}
}
}
/* Testing the ovserver */
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();
}
}
当心,有从标准的MouseMotionListener尽管一些显着的差异:
- 您将只收到
mouseMoved
事件,从未mouseDragged
事件。这是因为没有办法接收有关主窗口外点击的信息。 - 出于类似的原因,每个
MouseEvent
的modifiers
将始终为0 - 也是一样的价值观
clickCount
,popupTrigger
,button
- 您需要提供将被用作虚拟
java.awt.Component
(假)来源MouseEvent
s -null
值不允许在这里。
我不认为有更好的办法。这必须与操作系统无关,我怀疑这很容易实现。但是如果定期轮询MouseInfo.getPointerInfo方法会出现什么问题?你的用例是什么? – Karussell 2010-03-18 11:56:22