Cześć, znalazłem gdzieś na forum podobny kod. Po moich małych przeróbkach spełnia już prawie moje oczekiwania. Zostało mi tylko zrobić, żebym mógł upuszczać label w dowolnym miejscu (tam gdzie puszczę przycisk myszy) na prawym panelu. Nie wiem który element kodu za to odpowiada, dlatego proszę Was o pomoc
Screen programu :<image>
</image>
import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.dnd.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.activation.*;
import javax.swing.*;
import javax.swing.text.*;
public class DragTest3 {
public JComponent makeUI() {
DragPanel p1 = new DragPanel();
p1.setBorder(BorderFactory.createLineBorder(Color.BLACK));
p1.add(new JLabel(UIManager.getIcon("OptionPane.warningIcon")));
p1.add(new JLabel(UIManager.getIcon("OptionPane.errorIcon")));
MouseListener handler = new Handler();
p1.addMouseListener(handler);
LabelTransferHandler th = new LabelTransferHandler();
p1.setTransferHandler(th);
JPanel p = new JPanel(new GridLayout(1,2));
p.add(p1);
DragPanel p2 = new DragPanel();
p2.setBorder(BorderFactory.createLineBorder(Color.BLACK));
p2.addMouseListener(handler);
p2.setTransferHandler(th);
p.add(p2);
JPanel panel = new JPanel(new BorderLayout());
panel.add(p);
return panel;
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override public void run() {
createAndShowGUI();
}
});
}
public static void createAndShowGUI() {
JFrame f = new JFrame();
f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
f.getContentPane().add(new DragTest3().makeUI());
f.setSize(320, 240);
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}
class DragPanel extends JPanel {
public DragPanel() {
super();
}
public JLabel draggingLabel;
}
class Handler extends MouseAdapter {
@Override public void mousePressed(MouseEvent e) {
DragPanel p = (DragPanel)e.getSource();
Component c = SwingUtilities.getDeepestComponentAt(p, e.getX(), e.getY());
if(c!=null && c instanceof JLabel) {
p.draggingLabel = (JLabel)c;
p.getTransferHandler().exportAsDrag(p, e, TransferHandler.MOVE);
}
}
}
class LabelTransferHandler extends TransferHandler {
private final DataFlavor localObjectFlavor;
private final JLabel label = new JLabel() {
@Override public boolean contains(int x, int y) {
return false;
}
};
private final JWindow window = new JWindow();
public LabelTransferHandler() {
System.out.println("LabelTransferHandler");
localObjectFlavor = new ActivationDataFlavor(
DragPanel.class, DataFlavor.javaJVMLocalObjectMimeType, "JLabel");
window.add(label);
window.setAlwaysOnTop(true);
window.setBackground(new Color(0,true));
DragSource.getDefaultDragSource().addDragSourceMotionListener(
new DragSourceMotionListener() {
@Override public void dragMouseMoved(DragSourceDragEvent dsde) {
Point pt = dsde.getLocation();
pt.translate(5, 5); // offset
window.setLocation(pt);
}
});
}
@Override protected Transferable createTransferable(JComponent c) {
System.out.println("createTransferable");
DragPanel p = (DragPanel)c;
JLabel l = p.draggingLabel;
String text = l.getText();
//TEST
//if(text==null) {
// text = l.getIcon().toString();
//}
//return new StringSelection(text+"\n");
final DataHandler dh = new DataHandler(c, localObjectFlavor.getMimeType());
if(text==null) return dh;
final StringSelection ss = new StringSelection(text+"\n");
return new Transferable() {
@Override public DataFlavor[] getTransferDataFlavors() {
ArrayList<DataFlavor> list = new ArrayList<>();
for(DataFlavor f:ss.getTransferDataFlavors()) {
list.add(f);
}
for(DataFlavor f:dh.getTransferDataFlavors()) {
list.add(f);
}
return list.toArray(dh.getTransferDataFlavors());
}
public boolean isDataFlavorSupported(DataFlavor flavor) {
for (DataFlavor f: getTransferDataFlavors()) {
if (flavor.equals(f)) {
return true;
}
}
return false;
}
public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException {
if(flavor.equals(localObjectFlavor)) {
return dh.getTransferData(flavor);
} else {
return ss.getTransferData(flavor);
}
}
};
}
@Override public boolean canImport(TransferSupport support) {
if(!support.isDrop()) {
return false;
}
return true;
}
@Override public int getSourceActions(JComponent c) {
System.out.println("getSourceActions");
DragPanel p = (DragPanel)c;
label.setIcon(p.draggingLabel.getIcon());
label.setText(p.draggingLabel.getText());
window.pack();
Point pt = p.draggingLabel.getLocation();
SwingUtilities.convertPointToScreen(pt, p);
window.setLocation(pt);
window.setVisible(true);
return MOVE;
}
@Override public boolean importData(TransferSupport support) {
System.out.println("importData");
if(!canImport(support)) return false;
DragPanel target = (DragPanel)support.getComponent();
try {
DragPanel src = (DragPanel)support.getTransferable().getTransferData(localObjectFlavor);
JLabel l = new JLabel();
l.setIcon(src.draggingLabel.getIcon());
l.setText(src.draggingLabel.getText());
target.add(l);
target.revalidate();
return true;
} catch(UnsupportedFlavorException ufe) {
ufe.printStackTrace();
} catch(java.io.IOException ioe) {
ioe.printStackTrace();
}
return false;
}
@Override protected void exportDone(JComponent c, Transferable data, int action) {
System.out.println("exportDone");
DragPanel src = (DragPanel)c;
if(action == TransferHandler.COPY_OR_MOVE) {
src.remove(src.draggingLabel);
src.revalidate();
src.repaint();
}
src.draggingLabel = null;
window.setVisible(false);
}
}