[英]Java mouse motion anywhere on screen
我確信這是可能的,但我所有的搜索都是空白的。
在Java中,是否可以在Java應用程序之外注冊鼠標運動事件? 因此,如果鼠標指針移動到屏幕上的任何位置,我會收到回電。 輪詢MouseInfo.getPointerInfo
可以進行近似,但必須有更好的方法。
謝謝
解釋用例:它僅用於寵物項目,但基本上在鼠標觸及屏幕邊緣時觸發事件。 我還在想,如果你試圖超越屏幕的邊緣,可能會觸發不同的事件。 為此,我認為鼠標運動監聽器可能更合適。
java.awt.event.MouseMotionListener
僅向您提供有關應用程序窗口內鼠標移動的信息。 對於在該窗口之外發生的事件,無法繞過MouseInfo.getPointerInfo
。 但是,您可以編寫一個(可能是單例)類來定期輪詢指針信息,並允許添加MouseMotionListeners
:
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();
}
}
請注意,與標准MouseMotionListener存在一些明顯的差異:
mouseMoved
事件, mouseDragged
接收mouseDragged
事件。 那是因為無法接收有關主窗口外點擊的信息。 MouseEvent
的modifiers
將始終為0。 clickCount
, popupTrigger
, button
java.awt.Component
,它將用作MouseEvent
的(假)源 - 此處不允許使用null
值。
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