transferableimpl.java

JTREE的例子

package dragTree;

import java.io.*;
import java.awt.datatransfer.*;

public class TransferableImpl implements Transferable{
  final public static DataFlavor TRAN_FLAVOR =
    new DataFlavor(TransferableImpl.class, "TransferableImpl");
  static DataFlavor flavors[] = {TRAN_FLAVOR };
  private String name="";

  public TransferableImpl(){}

  public TransferableImpl(String name){
    this.name=name;
  }

  public boolean isDataFlavorSupported(DataFlavor df) {
    return df.equals(TRAN_FLAVOR);
  }

  public Object getTransferData(DataFlavor df)
   throws UnsupportedFlavorException, IOException {
    if (df.equals(TRAN_FLAVOR)) {
      return this;
    }
    else throw new UnsupportedFlavorException(df);
  }

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

  //sub class should at least overwrite these two methods
  public TransferableImpl copy(){
    return new TransferableImpl(name);
  }

  public String toString(){
    return this.name;
  }
}