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【Java】实现可拖动的窗口

作者:举起手来 / 发布于2012/6/25/ 511

实现可拖动的窗口

<div> public class MoveMouseListener implements MouseListener, MouseMotionListener
 {
 JComponent target;
 JFrame frame;
 public MoveMouseListener(JComponent target, JFrame frame) {
 this.target = target;
 this.frame = frame;
 }
 
 public void mouseClicked(MouseEvent e) {}
 public void mouseEntered(MouseEvent e) {}
 public void mouseExited(MouseEvent e) {}
 public void mousePressed(MouseEvent e) {}
 public void mouseReleased(MouseEvent e) {}
 public void mouseMoved(MouseEvent e) {}
 public void mouseDragged(MouseEvent e) {
 frame.setLocation(new Point(e.getX( ),e.getY( ));
 }
 Point getScreenLocation(MouseEvent e) {
 Point cursor = e.getPoint( );
 Point target_location = this.target.getLocationOnScreen( );
 return new Point(</div>
<div> (int)(target_location.getX( )+cursor.getX( )),
 (int)(target_location.getY( )+cursor.getY( )));
 }
 Point start_drag;
 Point start_loc;
 public void mousePressed(MouseEvent e) {
 this.start_drag = this.getScreenLocation(e);
 this.start_loc = this.getFrame(this.target).getLocation( );
 }
 public void mouseDragged(MouseEvent e) {
 Point current = this.getScreenLocation(e);
 Point offset = new Point(
 (int)current.getX( )-(int)start_drag.getX( ),
 (int)current.getY( )-(int)start_drag.getY( ));
 JFrame frame = this.getFrame(target);
 Point new_location = new Point(
 (int)(this.start_loc.getX( )+offset.getX( )),
 (int)(this.start_loc.getY( )+offset.getY( )));
 frame.setLocation(new_location);
 }
 public static void main(String[] args) { 
 JFrame frame = new JFrame( ); 
 CalendarHack ch = new CalendarHack( ); 
 ch.setDate(new Date( )); 
 frame.getContentPane( ).add(ch);</div>
<div>frame.setUndecorated(true);
 MoveMouseListener mml = new MoveMouseListener(ch, frame);
 ch.addMouseListener(mml);
 ch.addMouseMotionListener(mml);</div>
<div> frame.pack( );
 frame.setVisible(true);
 }
 }
</div>

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