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import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.event.InputEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.io.IOException;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.TransferHandler;
import javax.swing.UIManager;
import fr.histoiremondiale.utiles.igraphique.swing.Messages;
public class DndMultiple extends JPanel implements MouseMotionListener
{
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
UIManager.put("swing.boldMetal", Boolean.FALSE);
createAndShowGUI();
}
});
}
protected static void createAndShowGUI()
{
JFrame f = new JFrame("demo");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(1200,500);
f.add(new DndMultiple());
f.setLayout(new FlowLayout());
f.setVisible(true);
}
protected MonTransferHandler mth = new MonTransferHandler();
public DndMultiple()
{
Dimension d = new Dimension(350,350);
JInternalFrame src1 = new JInternalFrame("frame 1");
JInternalFrame src2 = new JInternalFrame("frame 2");
JInternalFrame src3 = new JInternalFrame("frame 3");
src1.setPreferredSize(d);
src2.setPreferredSize(d);
src3.setPreferredSize(d);
src1.setBackground(Color.BLUE);
src2.setBackground(Color.RED);
src3.setBackground(Color.GREEN);
src1.setVisible(true);
src2.setVisible(true);
src3.setVisible(true);
src1.addMouseMotionListener(this);
src2.addMouseMotionListener(this);
src3.addMouseMotionListener(this);
src1.setTransferHandler(mth);
src2.setTransferHandler(mth);
src3.setTransferHandler(mth);
this.add(src1);
this.add(src2);
this.add(src3);
}
@Override
public void mouseDragged(MouseEvent e)
{
JInternalFrame src = (JInternalFrame) e.getSource();
mth.exportAsDrag(src, e, TransferHandler.COPY);
}
@Override
public void mouseMoved(MouseEvent e) {}
protected class MonTransferHandler extends TransferHandler
{
JComponent source = null;
public void exportAsDrag(JComponent comp, InputEvent e, int action)
{
super.exportAsDrag(comp, e, action);
source = comp;
}
public int getSourceActions(JComponent c)
{
return TransferHandler.COPY;
}
public boolean canImport(TransferHandler.TransferSupport info)
{
return info.isDataFlavorSupported(DataFlavor.stringFlavor);
}
public boolean importData(TransferHandler.TransferSupport support)
{
//Nous contrôlons si les données reçues sont d'un type autorisé
if(!canImport(support)) return false;
//On récupère notre objet Transferable, celui qui contient les données en transit
Transferable data = support.getTransferable();
String str = "";
try
{
//Nous récupérons nos données en spécifiant ce que nous attendons
str = (String)data.getTransferData(DataFlavor.stringFlavor);
}
catch (UnsupportedFlavorException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
//Via le TransferSupport, nous pouvons récupérer notre composant cible
JComponent c = (JComponent) support.getComponent();
if (c instanceof JInternalFrame)
{
JInternalFrame cible = (JInternalFrame)c;
JInternalFrame src = (JInternalFrame)source;
Messages.messageInfo("source = " + src.getTitle() + "\ncible = " +cible.getTitle()
+"\ninfo = " + str);
return true;
}
return false;
}
protected Transferable createTransferable(JComponent c)
{
String info = ((JInternalFrame)c).getBackground().toString();
return new StringSelection(info);
}
}
} |
