transferabletreenode.java

用于转换JAVA中的树的结构类型,检测传输拖放的数据是否可以接受用,重载Transferable类型

// TransferableTreeNode.java
// A Transferable TreePath to be used with Drag & Drop applications.
//

import java.io.*;
import java.awt.dnd.*;
import java.awt.datatransfer.*;
import javax.swing.tree.*;

public class TransferableTreeNode implements Transferable {

  public static DataFlavor TREE_PATH_FLAVOR = new DataFlavor(TreePath.class, 
							     "Tree Path");
  DataFlavor flavors[] = { TREE_PATH_FLAVOR };
  TreePath path;
						   
  public TransferableTreeNode(TreePath tp) {
    path = tp;
  }

  public synchronized DataFlavor[] getTransferDataFlavors() {
    return flavors;
  }

  public boolean isDataFlavorSupported(DataFlavor flavor) {
    return (flavor.getRepresentationClass() == TreePath.class);
  }

  public synchronized Object getTransferData(DataFlavor flavor) 
    throws UnsupportedFlavorException, IOException {
    if (isDataFlavorSupported(flavor)) {
      return (Object)path;
    } else {
      throw new UnsupportedFlavorException(flavor);
    }
  }
}