trans_three2.java

来自「这是我在北大青鸟的第一学期的一个毕业设计」· Java 代码 · 共 60 行

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.border.BevelBorder;

 class EasyMove extends MouseAdapter implements MouseMotionListener {

  private Point offset;
  private Component host;



  public synchronized void install(Component comp)
  {
    uninstall();
    host = comp;
    host.addMouseListener(this);
    host.addMouseMotionListener(this);
  }

  public synchronized void uninstall()
  {
    if (host != null) {
      host.removeMouseListener(this);
      host.removeMouseMotionListener(this);
      host = null;
    }
  }

  public void mousePressed(MouseEvent e)
  {
    if (e.getSource() == host) offset = e.getPoint();
  }

  public void mouseDragged(MouseEvent e)
  {
    if (e.getSource() != host) return;

    final int x = host.getX();
    final int y = host.getY();
    final Point lastAt = e.getPoint();
    host.setLocation(x + lastAt.x - offset.x, y + lastAt.y - offset.y);
  }

  public void mouseMoved(MouseEvent e)
  {
  }
}