最近一直在搞Java3D 沒什么時間更新博客...最近又有很多事..
準備上學的事..減肥的事..等等等.....咱以后也是大學生啦。。哈哈
半透明的拖拽組件 可以拖拽任何有
addMouseListener方法并且有addMouseMotionListener方法的任何組件
包括JPanel 可以拖拽整個面板(JPanel)..
介紹一個人的博客(打個小廣告.嘿嘿)
http://blog.sina.com.cn/swingjava
這個人很強吧,拖拽的本來是從他博客里看到他的項目介紹..我才想起來想辦法實現這個拖拽效果的功能
不過他沒開放源碼..我就弄了一個......有些地方我并沒有精簡..因為這樣的話..比較直觀..更容易去理解他...如果你真正理解了..有很多地方是可以精簡的...大家仔細看哦...有點難度.
效果圖:
為了讓你們看出更好的效果。。我把JPanel的背景色設置了一下
一共7個類..大家仔細的研究..難度是有點..不過努力就對了??！
第一個類.
package GhostGlassPane;
import java.awt.BorderLayout;
import java.awt.Color;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class demo extends JFrame
{
private GhostGlassPane glassPane;
private GhostComponentAdapter componentAdapter;
private JButton ceshi1;
private JButton ceshi2;
private JButton ceshi3;
private JButton ceshi4;
private JLabel lceshi;
private JPanel jpanel;
private JButton button;
public demo()
{
super("Drag n' Ghost Demo");
setLayout(new BorderLayout());
glassPane = new GhostGlassPane();
componentAdapter = new GhostComponentAdapter(null,null);
setGlassPane(glassPane);
ceshi1 = new JButton("按住我移動鼠標");
ceshi1.addMouseListener(componentAdapter = new GhostComponentAdapter(glassPane, "我是超級Button"));
ceshi1.addMouseMotionListener(new GhostMotionAdapter(glassPane));
ceshi2 = new JButton("按住我移動鼠標");
ceshi2.addMouseListener(componentAdapter = new GhostComponentAdapter(glassPane, "我是超級Button"));
ceshi2.addMouseMotionListener(new GhostMotionAdapter(glassPane));
ceshi3 = new JButton("按住我移動鼠標");
ceshi3.addMouseListener(componentAdapter = new GhostComponentAdapter(glassPane, "我是超級Button"));
ceshi3.addMouseMotionListener(new GhostMotionAdapter(glassPane));
ceshi4 = new JButton("按住我移動鼠標");
ceshi4.addMouseListener(componentAdapter = new GhostComponentAdapter(glassPane, "我是超級Button"));
ceshi4.addMouseMotionListener(new GhostMotionAdapter(glassPane));
lceshi = new JLabel("按住我拖拽(JLabel)");
lceshi.addMouseListener(componentAdapter = new GhostComponentAdapter(glassPane, "我是超級JLabel"));
lceshi.addMouseMotionListener(new GhostMotionAdapter(glassPane));
button = new JButton("按住我移動鼠標");
button.addMouseListener(componentAdapter = new GhostComponentAdapter(glassPane, "我是超級Button"));
button.addMouseMotionListener(new GhostMotionAdapter(glassPane));
jpanel = new JPanel();
jpanel.setBackground(Color.gray);
jpanel.addMouseListener(componentAdapter = new GhostComponentAdapter(glassPane, "我是超級JPanel"));
jpanel.addMouseMotionListener(new GhostMotionAdapter(glassPane));
jpanel.add(lceshi);
jpanel.add(button);
add(ceshi1,BorderLayout.SOUTH);
add(ceshi2,BorderLayout.WEST);
add(ceshi3,BorderLayout.EAST);
add(ceshi4,BorderLayout.NORTH);
add(jpanel,BorderLayout.CENTER);
setSize(400,300);
setTitle("半透明拖拽組件");
setResizable(false);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public static void main(String[] args)
{
demo d = new demo();
d.setVisible(true);
}
}
第二個類:
package GhostGlassPane;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import javax.swing.SwingUtilities;
public class GhostComponentAdapter extends GhostDropAdapter
{
public GhostComponentAdapter(GhostGlassPane glassPane, String action) {
super(glassPane, action);
}
public void mousePressed(MouseEvent e)
{
Component c = e.getComponent();
BufferedImage image = new BufferedImage(c.getWidth(), c.getHeight(), BufferedImage.TYPE_INT_ARGB);
Graphics g = image.getGraphics();
c.paint(g);
glassPane.setVisible(true);
Point p = (Point) e.getPoint().clone();
SwingUtilities.convertPointToScreen(p, c);
SwingUtilities.convertPointFromScreen(p, glassPane);
glassPane.setPoint(p);
glassPane.setImage(image);
glassPane.repaint();
}
public void mouseReleased(MouseEvent e)
{
Component c = e.getComponent();
Point p = (Point) e.getPoint().clone();
SwingUtilities.convertPointToScreen(p, c);
Point eventPoint = (Point) p.clone();
SwingUtilities.convertPointFromScreen(p, glassPane);
glassPane.setPoint(p);
glassPane.setVisible(false);
glassPane.setImage(null);
fireGhostDropEvent(new GhostDropEvent(action, eventPoint));
}
}
第三個類
package GhostGlassPane;
import java.awt.event.MouseAdapter;
import java.util.ArrayList;
import java.util.List;
import java.util.Iterator;
public class GhostDropAdapter extends MouseAdapter {
protected GhostGlassPane glassPane;
protected String action;
private List listeners;
public GhostDropAdapter(GhostGlassPane glassPane, String action) {
this.glassPane = glassPane;
this.action = action;
this.listeners = new ArrayList();
}
public void addGhostDropListener(GhostDropListener listener) {
if (listener != null)
listeners.add(listener);
}
public void removeGhostDropListener(GhostDropListener listener) {
if (listener != null)
listeners.remove(listener);
}
protected void fireGhostDropEvent(GhostDropEvent evt) {
Iterator it = listeners.iterator();
while (it.hasNext()) {
((GhostDropListener) it.next()).ghostDropped(evt);
}
}
}
第四個類:
package GhostGlassPane;
import java.awt.Point;
public class GhostDropEvent {
private Point point;
private String action;
public GhostDropEvent(String action, Point point) {
this.action = action;
this.point = point;
}
public String getAction() {
return action;
}
public Point getDropLocation() {
return point;
}
}
第五個類:
package GhostGlassPane;
public interface GhostDropListener {
public void ghostDropped(GhostDropEvent e);
}
第六個類:
package GhostGlassPane;
import java.awt.AlphaComposite;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.image.BufferedImage;
import javax.swing.JPanel;
public class GhostGlassPane extends JPanel
{
private AlphaComposite composite;
private BufferedImage dragged = null;
private Point location = new Point(0, 0);
public GhostGlassPane()
{
setOpaque(false);
composite = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.5f);
}
public void setImage(BufferedImage dragged)
{
this.dragged = dragged;
}
public void setPoint(Point location)
{
this.location = location;
}
public void paintComponent(Graphics g)
{
if (dragged == null)
return;
Graphics2D g2 = (Graphics2D) g;
g2.setComposite(composite);
g2.drawImage(dragged,
(int) (location.getX() - (dragged.getWidth(this) / 2)),
(int) (location.getY() - (dragged.getHeight(this) / 2)),
null);
}
}
第七個類:
package GhostGlassPane;
import java.awt.Component;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import javax.swing.SwingUtilities;
public class GhostMotionAdapter extends MouseMotionAdapter
{
private GhostGlassPane glassPane;
public GhostMotionAdapter(GhostGlassPane glassPane) {
this.glassPane = glassPane;
}
public void mouseDragged(MouseEvent e)
{
Component c = e.getComponent();
Point p = (Point) e.getPoint().clone();
SwingUtilities.convertPointToScreen(p, c);
SwingUtilities.convertPointFromScreen(p, glassPane);
glassPane.setPoint(p);
glassPane.repaint();
}
}