爪哇.拖动&将 ImageIcon 从面板 1 上的 JLabel 拖放到面板 2 上的 JLabel.添加计数器功能
我已经实现了这个非常基本的，在两个 JPanel 之间拖放，但这并不能真正满足我的要求！
I've implemented this very basic, drag and drop between two JPanels, but this doesn't really meet my requirements!
public class test extends JFrame {
{ JPanel mainpanel, storypanel, imageselect;
public test(){
mainpanel = new JPanel(new BorderLayout());
storypanel = new JPanel();
imageselect = new JPanel();
MouseListener listener = new MouseAdapter(){
public void mousePressed(MouseEvent e)
{
JComponent c = (JComponent) e.getSource();
TransferHandler handler = c.getTransferHandler();
handler.exportAsDrag(c, e, TransferHandler.COPY);
}
};
int j = 0;
BufferedImage myImages;
JLabel imgselect = new JLabel();
try { myImages = ImageIO.read(new File("four.jpg"));
//myImages[j] = resize(myImages[j]);
imgselect= new JLabel(new ImageIcon(myImages));
System.out.println(j);
imageselect.add(imgselect);
imgselect.addMouseListener(listener);
imgselect.setTransferHandler(new TransferHandler("icon"));
} catch(Exception e) {};
int i = 0;
BufferedImage storyimages;
JLabel storylabel = new JLabel();
//targetImg = new ImageIcon("lmkpackage/base/TargetImg.jpg");
try{ storyimages = ImageIO.read(new File("TargetImg.jpg"));
//storyimages[i] = resize(storyimages[i]);
storylabel = new JLabel(new ImageIcon(storyimages));
System.out.println(i);
storypanel.add(storylabel);
storylabel.addMouseListener(listener);
storylabel.setTransferHandler(new TransferHandler("icon"));
} catch(Exception e) {};
mainpanel.add(imageselect, BorderLayout.NORTH);
mainpanel.add(storypanel, BorderLayout.SOUTH);
getContentPane().add(mainpanel);
}
public static void main(String[] args){
System.out.println("Application Running");
JFrame mainframe = new test();
mainframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainframe.setSize(1000,1000);
mainframe.setVisible(true);
}
}
对不起，我在这里不是很清楚.我试图将 ImageIcon 从图像选择面板上的 JLabel 拖到故事情节面板的另一个 JLabel 上.我可以用上面的代码做到这一点.但是当我这样做时，我可以从图像选择面板中拖动一个 ImageIcon，并在同一面板上替换另一个 ImageIcon.我不希望这种情况发生.我也可以从故事情节面板拖动到图像选择面板，这是我不想要的.
Sorry I wasn't very clear here. Im trying to drag an ImageIcon from a JLabel on the imageselect panel, to another JLabel the storyline panel. I can do this, with the above code. But when I do this, I can drag an ImageIcon from the imageselect panel, and replace another ImageIcon on the same panel. I do NOT want this to happen. I can also drag from the storyline panel to the imageselect panel, which I do NOT want.
我不是要求被勺子喂食代码，我只是在寻找正确方向的推动力！
I'm not asking to be spoon fed code, I'm just looking for a push in the right direction!
我想知道是否有任何方法可以计算成功的拖放操作，下面的解决方案回答了我原来的问题.
I'm wondering is there any way of counting a successful drag and drop operation, the solution below answered my original question.
推荐答案
这基本上是@Andrew 评论的大纲 - 由于您的 SSCCE 很容易实现 :-)
This is basically an outline of @Andrew's comment - easily possible due to your SSCCE :-)
子类 TransferHandler，覆盖 canImport 以检查源标签是否在 imageSelect 面板上，如果是则拒绝.
Subclass TransferHandler, override canImport to check if the source label is on the imageSelect panel and reject if so.
// custom transferHandler which decides about imports based on source
TransferHandler handler = new TransferHandler("icon") {
@Override
public boolean canImport(TransferSupport support) {
return super.canImport(support)
&& support.getComponent().getParent() != imageSelectPanel;
}
};
// use the handler on all labels (handlers can be shared, btw)
// for each label on imageSelectPanel
imageSelectLabel.setTransferHandler(handler)
// for each label on the target panel (aka storyPanel)
storyLabel.setTransferHandler(handler)
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