Java。将ImageIcon从面板1的JLabel拖放到面板2的JLabel。添加计数器功能

这基本上是@Andrew的评论的概述-由于您的SSCCE，很容易实现:-)

子类TransferHandler，重写canImport以检查源标签是否在imageSelect面板上，如果不是，则拒绝。

// custom transferHandler which decides about imports based on source TransferHandler handler = new TransferHandler('icon') {@Overridepublic 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)解决方法

我已经在两个JPanel之间实现了这种非常基本的拖放操作，但这并不能真正满足我的要求！

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，我在这里不太清楚。我试图将ImageIcon从imageselect面板上的JLabel拖动到故事情节面板上的另一个JLabel。我可以使用上面的代码来做到这一点。但是，当我这样做时，可以从imageselect面板中拖动一个ImageIcon，然后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到不需要的图像选择面板。

我并不是要成为傻瓜式的代码，我只是在寻找正确的方向！

编辑：我想知道有什么方法可以计算成功的拖放操作，下面的解决方案回答了我的原始问题。