JAVA拖放;将图像图标从面板1上的JLabel放置到面板2上的JLabel。添加计数器功能
我已经在两个JPanel之间实现了这个非常基本的拖放操作,但这并不能真正满足我的要求JAVA拖放;将图像图标从面板1上的JLabel放置到面板2上的JLabel。添加计数器功能,java,swing,drag-and-drop,jlabel,Java,Swing,Drag And Drop,Jlabel,我已经在两个JPanel之间实现了这个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();
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,我这里不是很清楚。我正在尝试将图像图标从imageselect面板上的JLabel拖动到故事情节面板上的另一个JLabel。我可以用上面的代码做到这一点。
但当我这样做时,我可以从imageselect面板拖动一个ImageIcon,并替换同一面板上的另一个ImageIcon。我不希望这种情况发生。我还可以从“故事情节”面板拖动到imageselect面板,我不希望这样做
我不是要求被填鸭式的编码,我只是在寻找一个正确的方向推动
编辑: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最初的问题。这基本上是@Andrew评论的概要-由于您的SSCCE:-,很容易做到。) 子类TransferHandler,重写canImport以检查源标签是否在imageSelect面板上,如果在imageSelect面板上则拒绝
// 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)
请看哪一个教程,DnD可能是夜猫子,但带图像的JLabel不会以某种方式复杂化,并拒绝在“发件人”面板上放置?为了更快地获得更好的帮助,请发布一条消息。@AndrewThompson我已经用更多信息更新了我的问题detail@Peddler断章取义的代码段仍然不是。@JarrodRoberson上次编辑时我没有添加该代码段。