swing拖动图片

Question

请教怎么样能用鼠标拖动已经载入到swing组件中的图片?

Answer 1

做一个时间处理，在鼠标拖动的时候设置图片的坐标，OK了 挺简单的，LZ仔细想想

Answer 2

其实可以不用时间的
在MouseDragged事件里不断把图片放在新的坐标
然后repaint就可以了啊~
呵呵~~
搂主愿意的话可以试试看~~

Answer 3

这个是我做的一个拖动图片的例子楼主看下吧 嘿嘿 最好能给分哦嘻嘻 
class MyPanel extends JPanel implements MouseListener,MouseMotionListener,Runnable,KeyListener
{
private Picture activePic;
private Vector pv= new Vector(10,5);
private int width=0;
private int height=0;
private BufferedImage bi=null;
Thread thread;
public MyPanel(int w,int h)
{
this.width=w;
this.height=h;
this.setFocusable(true);
this.setVisible(true);
this.addKeyListener(this);
this.addMouseListener(this);
this.addMouseMotionListener(this);
this.bi=new BufferedImage(width,height,BufferedImage.TYPE_INT_ARGB);
thread= new Thread(this);
thread.start();
}
public void run()
{
while(true)
{
repaint();
try
{
Thread.currentThread().sleep(100);
}
catch (Exception e)
{
System.out.println("sleep error e="+e);
}
}
}
public void loadPic(String [] name)
{
for(int i=0;i<name.length;i++)
{
Picture pic = new Picture(new ImageIcon(name[i]).getImage(),0,0);
pv.addElement(pic);
pic=null;
}
activePic=(Picture)pv.elementAt(pv.size()-1);
}
public void keyPressed(KeyEvent e)
{
System.out.println("key code="+e.getKeyCode());
int keyCode = e.getKeyCode();
switch(keyCode)
{
case 16: //左侧shift键 切换激活图片
for(int i=0;i<pv.size();i++)
{
if(((Picture)pv.elementAt(i)).equals(activePic))
{
if(i<pv.size()-1)
activePic=(Picture)pv.elementAt(i+1);
else
activePic=(Picture)pv.elementAt(0);
break;
}
}
case 37: //左
if(activePic.x>0)
activePic.x--;
break;
case 38: //上
if(activePic.y>0)
activePic.y--;
break;
case 39:  //右
if(activePic.x+activePic.width<this.width)
activePic.x++;
break;
case 40: //下
if(activePic.y+activePic.height<this.height)
activePic.y++;
break;
}
}
public void keyReleased(KeyEvent e)
{

}
public void keyTyped(KeyEvent e)
{

}
public void mouseClicked(MouseEvent e)
{
}
public void mouseEntered(MouseEvent e)
{
}
public void mouseExited(MouseEvent e)
{//System.out.println("mouse Exitedvalue="+e.getButton());

}
public void mousePressed(MouseEvent e)
{
if(pv.isEmpty())
return;
System.out.println("mouse clicked x="+e.getX()+" y="+e.getY()+"in activePic?="+(e.getX()>activePic.x&&e.getX()<activePic.x+activePic.width&&
e.getY()>activePic.y&&e.getY()<activePic.y+activePic.height));
for(int i=this.pv.size()-1;i>=0;i--)
{
if(e.getX()>((Picture)pv.elementAt(i)).x&&e.getX()<((Picture)pv.elementAt(i)).x+((Picture)pv.elementAt(i)).width&&
e.getY()>((Picture)pv.elementAt(i)).y&&e.getY()<((Picture)pv.elementAt(i)).y+((Picture)pv.elementAt(i)).height)
{
this.activePic=(Picture)pv.elementAt(i);
break;
}
}
if(e.getX()>activePic.x&&e.getX()<activePic.x+activePic.width&&
e.getY()>activePic.y&&e.getY()<activePic.y+activePic.height)
{
activePic.anchorX=e.getX();
activePic.anchorY=e.getY();
activePic.focused=true;
}
}
public void mouseReleased(MouseEvent e)
{
if(pv.isEmpty())
return;
System.out.println("mouse released");
activePic.anchorX=0;
activePic.anchorY=0;
activePic.anchorX=e.getX();
activePic.anchorY=e.getY();
activePic.x=activePic.x+(e.getX()-activePic.anchorX);
activePic.y=activePic.y+(e.getY()-activePic.anchorY);
System.out.println("activePic.anchorX="+activePic.anchorX);
System.out.println("activePic.anchorY="+activePic.anchorY);
System.out.println("activePic x="+activePic.x);
System.out.println("activePic y="+activePic.y);
activePic.focused=false;
}
public void mouseDragged(MouseEvent e)
{
if(pv.isEmpty())
return;
System.out.println("e.getX="+e.getX());
System.out.println("e.getY="+e.getY());
if(activePic.focused)
{
if(activePic.x>=0&&activePic.x+activePic.width<=width&&activePic.y>=0&&activePic.y+activePic.height<=height)
{
activePic.x=activePic.x+(e.getX()-activePic.anchorX);
activePic.y=activePic.y+(e.getY()-activePic.anchorY);
activePic.anchorX=e.getX();
activePic.anchorY=e.getY();
}
if(activePic.x<0)
{
activePic.x=0;
activePic.anchorX=e.getX();
}
if(activePic.x+activePic.width>width)
{
activePic.x=width-activePic.width;
activePic.anchorX=e.getX();
}
if(activePic.y<0)
{
activePic.y=0;
activePic.anchorY=e.getY();
}
if(activePic.y+activePic.height>height)
{
activePic.y=height-activePic.height;
activePic.anchorY=e.getY();
}
//System.out.println("activePic.x="+activePic.x);
//System.out.println("activePic.y="+activePic.y);
}
}
public void mouseMoved(MouseEvent e)
{//System.out.println("mouse Movedvalue="+e.getButton());
}
public void paintComponent(Graphics g)
{
Graphics bg=bi.getGraphics();
bg.setClip(0,0,width,height);
bg.setColor(Color.BLACK);
bg.fillRect(0,0,width,height);
for(int i=0;i<pv.size();i++)
{
if(!activePic.equals(((Picture)pv.elementAt(i))))
((Picture)pv.elementAt(i)).paint(bg);
}
if(!pv.isEmpty())
{
bg.setColor(Color.RED);
bg.setClip(activePic.x-1,activePic.y-1,activePic.width+3,activePic.height+3);
bg.drawRect(activePic.x-1,activePic.y-1,activePic.width+1,activePic.height+1);
activePic.paint(bg);
}
g.drawImage(this.bi,0,0,null);

}

}class Picture
{
Image img;
boolean focused=false;
int x;
int y;
int width;
int height;
int anchorX=0;
int anchorY=0;
public  Picture(Image img,int x,int y)//,int width,int height)
{
this.img=img;
this.x=x;
this.y=y;
this.width=img.getWidth(null);
this.height=img.getHeight(null);
}
public void paint(Graphics g)
{
g.setClip(x,y,width,height);
g.drawImage(this.img,x,y,null);
}
}

Answer 4

太长继续贴
class   FileTransferHandler   extends   TransferHandler   {   
    
MyPanel panel;
    public   FileTransferHandler(MyPanel p)   {   
           this.panel=p;
    }       public   boolean   importData(JComponent   c,   Transferable   t)   
    {   System.out.println("entry importData");
            try   {   
            List   files   =   (List)t.getTransferData(DataFlavor.javaFileListFlavor);  
            String []s= new String[files.size()];
            for(int i=0;i<files.size();i++)
            {
             System.out.println("files["+i+"]="+files.get(i).toString());
             s[i]=files.get(i).toString();
            } 
            System.out.println("prepare to loadPic");
            panel.loadPic(s);
            return   true;   
            }   
            catch   (UnsupportedFlavorException   ufe)   
            {   
            ufe.printStackTrace();   
            }   
            catch   (IOException   e)   
            {   
             e.printStackTrace();   
            }   
            return   false;   
    }       public   boolean   canImport(JComponent   c,   DataFlavor[]   flavors)   
    {   System.out.println("entry canImport");
        for   (int   i   =   0;   i   <   flavors.length;   i++)   
        {   
            if   (DataFlavor.javaFileListFlavor.equals(flavors[i]))   
            {   
                    return   true;   
            }   
        }   
        return   false;   
    } 
}
class Console
{
public static String title( Object o)
{
String t=o.getClass().toString();
if(t.indexOf("class")!=-1)
t = t.substring(6);
return t;
}
public static void run(JFrame frame , int width , int height)
{
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(width,height);
frame.setVisible(true);
}
public static void run(JApplet applet,int width ,int height)
{
JFrame frame = new JFrame(title(applet));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(applet);
frame.setSize(width,height);
applet.init();
applet.start();
frame.setVisible(true);
}
public static void run (JPanel panel,int width, int height)
{
JFrame frame=new JFrame(title(panel));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(panel);
frame.setSize(width,height);
frame.setVisible(true);
}
}

Answer 5

这个是主类
public class Editor extends JFrame {

private static int width =500;
private static int height =300;

private MyPanel panel;
public Editor()
{
super();
panel=new MyPanel(width,height);
panel.setTransferHandler(new FileTransferHandler(panel));
Container c=this.getContentPane();
c.add(panel);
this.pack();
// c.addMouseListener(panel);
// c.addMouseMotionListener(panel);
//c.addKeyListener(panel);

}

public static void main(String [] args)
{
Console.run(new Editor(),width,height);
}
}