Drag and Drop between JLists (3)

Sample code for dragging Icons from one list to another.

import java.awt.BorderLayout;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import javax.swing.DefaultListModel;
import javax.swing.DropMode;
import javax.swing.ImageIcon;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JSplitPane;
import javax.swing.TransferHandler;

public class DragDropDemo2 extends JFrame {
    private JList<ImageIcon> source;
    private JList<ImageIcon> target;
    private DefaultListModel<ImageIcon> model = new DefaultListModel<ImageIcon>();
    private String imageLoc = "C:/images/";
 
    public DragDropDemo2() {
        source = new JList<ImageIcon>(new ImageIcon[]{new ImageIcon(imageLoc+"open.gif"),
                        new ImageIcon(imageLoc+"paste.gif"), new ImageIcon(imageLoc+"print.gif")});
        target = new JList<ImageIcon>();
        target.setModel(model);
     
        source.setDragEnabled(true);
        target.setDropMode(DropMode.ON_OR_INSERT);
     
        source.setTransferHandler(new ExportTransferHandler());
        target.setTransferHandler(new ImportTransferHandler());
     
        JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, source, target);
        JLabel label = new JLabel("Please drag your selection from the left list to the right");
     
        add(splitPane);
        add(label, BorderLayout.NORTH);
        this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        pack();
        setVisible(true);
    }
 
    private class ExportTransferHandler extends TransferHandler {
        public int getSourceActions(JComponent c){
            return TransferHandler.COPY_OR_MOVE;
        }
     
        public Transferable createTransferable(JComponent c) {
            return new MyTransferable();
        }
    }
 
    private class MyTransferable implements Transferable {
        public Object getTransferData(DataFlavor flavor){
            if (flavor == DataFlavor.imageFlavor){
                return source.getSelectedValue();
            }
            return null;
        }
     
        public DataFlavor[] getTransferDataFlavors(){
            return new DataFlavor[] {DataFlavor.imageFlavor};
        }
     
        public boolean isDataFlavorSupported(DataFlavor flavor){
            if (flavor.equals(DataFlavor.imageFlavor)){
                return true;
            }
            return false;
        }
    }
 
    private class ImportTransferHandler extends TransferHandler {

        public boolean canImport(TransferHandler.TransferSupport supp) {
            if (!supp.isDataFlavorSupported(DataFlavor.imageFlavor)) {
                return false;
            }
            return true;
        }
     
        public boolean importData(TransferHandler.TransferSupport supp) {
            // Fetch the Transferable and its data
            Transferable t = supp.getTransferable();
            ImageIcon selected = null;
            try {
                selected = (ImageIcon)t.getTransferData(DataFlavor.imageFlavor);
            } catch (Exception e){
                System.out.println(e.getMessage());
                return false;
            }

            // Fetch the drop location
            JList.DropLocation loc = target.getDropLocation();
            int row = loc.getIndex();
            model.add(row, selected);
            target.validate();
            return true;
        }
    }
 
    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new DragDropDemo2();
            }
        });
    }
}

Further Readings:
1. Drag and Drop between JLists (1)
2. Drag and Drop between JList (2)

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