java 窗体吸附在屏幕边缘

[java]代码库

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class WindowSnapper extends ComponentAdapter {

    private boolean locked = false;
    private int snap_distance = 50;

    public void componentMoved(ComponentEvent evt) {
        if(locked) return;
        Dimension size = Toolkit.getDefaultToolkit( ).getScreenSize( );
        int nx = evt.getComponent( ).getX( );
        int ny = evt.getComponent( ).getY( );
        // top
        if(ny < 0+snap_distance) {
            ny = 0;
        }
        // left
        if(nx < 0+snap_distance) {
            nx = 0;
        }
        // right
        if(nx > size.getWidth( ) - evt.getComponent( ).getWidth( ) -
                snap_distance) {
            nx = (int)size.getWidth( )-evt.getComponent( ).getWidth( );
        }
        // bottom
        if(ny > size.getHeight( ) - evt.getComponent( ).getHeight( ) -
                snap_distance) {
            ny = (int)size.getHeight( )-evt.getComponent( ).getHeight( );
        }

        // make sure we don't get into a recursive loop when the
        // set location generates more events
locked = true;
        evt.getComponent( ).setLocation(nx,ny);
        locked = false;
    }

       public static void main(String[] args) {
           JFrame frame = new JFrame("Hack #33: Window Snapping");
           JLabel label = new JLabel(
              "Move this window's titlebar to demonstrate screen edge snapping.");

             frame.getContentPane( ).add(label);  
             frame.pack( );

             frame.addComponentListener(new WindowSnapper( ));
             frame.setVisible(true);
       }
}

//源代码片段来自云代码http://yuncode.net