DragAndDrop.java

package ij.plugin;
import ij.*;
import ij.io.*;
import java.io.*;
import java.awt.datatransfer.*;
import java.awt.dnd.*;
import java.util.List;
import java.util.Iterator;

public class DragAndDrop implements PlugIn, DropTargetListener {
    protected static ImageJ ij = null;  // the "ImageJ" frame
    private static boolean enableDND = true; 
    protected DataFlavor dFlavor;  
    
    public void run(String arg) {
        String vers = System.getProperty("java.version");
        if (vers.compareTo("1.3.1") < 0)
             return;
        ij = IJ.getInstance();
        ij.setDropTarget(null);
        DropTarget dropTarget = new DropTarget(ij, this);
    }  
        
    public void drop(DropTargetDropEvent dtde)  {
        dtde.acceptDrop(DnDConstants.ACTION_COPY);
        try  {
            Transferable t = dtde.getTransferable();
            if (t.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
                Object data = t.getTransferData(DataFlavor.javaFileListFlavor);
                Iterator iterator = ((List)data).iterator();
                while(iterator.hasNext()) {
                    File file = (File)iterator.next();
                    new Opener().open(file.getAbsolutePath());
                }
            }
        }
        catch(Exception e)  {
                dtde.dropComplete(false);
                return;
        }
        dtde.dropComplete(true);
        } 

        public void dragEnter(DropTargetDragEvent dtde)  {
        dtde.acceptDrag(DnDConstants.ACTION_COPY);
        }

        public void dragOver(DropTargetDragEvent e) {}
        public void dragExit(DropTargetEvent e) {}
        public void dropActionChanged(DropTargetDragEvent e) {}
}