movemouselistener.java

来自「oraily的Swing hacks code」· Java 代码 · 共 52 行

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class MoveMouseListener implements MouseListener, MouseMotionListener {
    JComponent target;
    Point start_drag;
    Point start_loc;

    public MoveMouseListener(JComponent target) {
        this.target = target;
    }

    public static JFrame getFrame(Container target) {
        if(target instanceof JFrame) {
            return (JFrame)target;
        }
        return getFrame(target.getParent());
    }

    Point getScreenLocation(MouseEvent e) {
        Point cursor = e.getPoint();
        Point target_location = this.target.getLocationOnScreen();
        return new Point(
            (int)(target_location.getX()+cursor.getX()),
            (int)(target_location.getY()+cursor.getY()));
    }
    public void mouseClicked(MouseEvent e) {}
    public void mouseEntered(MouseEvent e) {}
    public void mouseExited(MouseEvent e) {}
    public void mousePressed(MouseEvent e) {
        this.start_drag = this.getScreenLocation(e);
        this.start_loc = this.getFrame(this.target).getLocation();
    }

    public void mouseReleased(MouseEvent e) {}

    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 void mouseMoved(MouseEvent e) {}
}