Drag and drop of a group of files into a tree : Tree « Swing JFC « Java

1. Java
2. Swing JFC
3. Tree

Drag and drop of a group of files into a tree

    
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

import javax.swing.JComponent;
import javax.swing.JTree;
import javax.swing.TransferHandler;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;

public class MyTree extends JTree {

  public MyTree() {
    super();
    setDragEnabled(false);
    setTransferHandler(new FSTransfer());
  }

}

class FSTransfer extends TransferHandler {
  public boolean importData(JComponent comp, Transferable t) {
    if (!(comp instanceof MyTree)) {
      return false;
    }
    if (!t.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
      return false;
    }
    MyTree tree = (MyTree) comp;
    DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
    DefaultMutableTreeNode root = (DefaultMutableTreeNode) model.getRoot();
    try {
      List data = (List) t.getTransferData(DataFlavor.javaFileListFlavor);
      Iterator i = data.iterator();
      while (i.hasNext()) {
        File f = (File) i.next();
        root.add(new DefaultMutableTreeNode(f.getName()));
      }
      model.reload();
      return true;
    } catch (Exception ioe) {
      System.out.println(ioe);
    }
    return false;
  }

  public boolean canImport(JComponent comp, DataFlavor[] transferFlavors) {
    if (comp instanceof MyTree) {
      for (int i = 0; i < transferFlavors.length; i++) {
        if (!transferFlavors[i].equals(DataFlavor.javaFileListFlavor)) {
          return false;
        }
      }
      return true;
    }
    return false;
  }
}

   
    
    
    
  

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