JTree之间的drag/drop

王朝other·作者佚名  2008-05-31
窄屏简体版  字體: |||超大  

关于JTree 之间的drag/drop一直找不到合适的方法。现通过鼠标事件的相应实现了该过程。希望和大家一起学习。

源码如下:

import Javax.swing.*;

import javax.swing.event.*;

import java.awt.datatransfer.*;

import java.awt.dnd.*;

import javax.swing.tree.*;

public class DragDropTree implements MouseMotionListener,MouseListener, DragGestureListener,DragSourceListener

{

private JTree tree1=null;

private JTree tree2=null;

Object lastNode;

Vector vet=new Vector();

TreeSelectionModel selectionModel=tree1.getSelectionModel();

Vector vetnew=new Vector();

private boolean drag=false;

public DragDropTree(JTree t1,JTree t2)

{

tree1=t1;

tree2=t2;

DragSource dragSource = DragSource.getDefaultDragSource();

dragSource.createDefaultDragGestureRecognizer(

tree1, // component where drag originates

DnDConstants.ACTION_COPY_OR_MOVE, // actions

this); // drag gesture recognizer

dragSource.createDefaultDragGestureRecognizer(

tree2, // component where drag originates

DnDConstants.ACTION_COPY_OR_MOVE, // actions

this); // drag gesture recognizer

tree1.addMouseMotionListener(this);

tree1.addMouseListener(this);

tree2.addMouseMotionListener(this);

tree2.addMouseListener(this);

}

public void mouseEntered(MouseEvent e)

{

JTree selecttree=(JTree)e.getSource();

TreePath path=selecttree.getPathForLocation(e.getX(), e.getY());

if(path!=null)

{

if(drag&vet!=null)

{

drag=false;

String str=path.getPathComponent(1).toString();

MutableTreeNode parent,node=(MutableTreeNode)path.getLastPathComponent();

if(node.isLeaf())

parent=(MutableTreeNode)node.getParent();

else

parent=node;

int index=parent.getIndex(node)+1;

System.out.println("now node is in "+index+"level");

DefaultTreeModel model=(DefaultTreeModel)tree2.getModel();

int j=0;

while(j<vet.size())

{

String ss=vet.elementAt(j).toString();

MutableTreeNode newnode=new DefaultMutableTreeNode(ss);

model.insertNodeInto(newnode,parent,index);

j++;

}

vet=null;

vet=new Vector();

}

else;

}

else;

}

public void mouseDragged(MouseEvent e){

drag=true;

if(selectionModel!=null)selectionModel.clearSelection();

}

public void mouseMoved(MouseEvent e){}

public void mouseClicked(MouseEvent e){}

public void mouseExited(MouseEvent e){}

public void mousePressed(MouseEvent e)

{

lastNode=null;

if(e.getClickCount()==1)

{

TreePath path=tree1.getPathForLocation(e.getX(), e.getY());

if(path!=null){

TreeNode node=(TreeNode)path.getLastPathComponent();

if(node.isLeaf())

{

lastNode=(MutableTreeNode)path.getLastPathComponent();

TreeSelectionModel selectionModel=tree1.getSelectionModel();

int a=selectionModel.getSelectionCount();

System.out.println("node is :"+a);

if(a>1)

{

if(vetnew!=null){

System.out.println(vetnew.size()+"have so mUCh path");

for(int n=0;n<vetnew.size();n++)

{

TreePath p=(TreePath)vetnew.get(n);

System.out.println(p);

if(p==path)path=null;

}

}

if(path!=null)

{

vet.addElement(lastNode);

vetnew.addElement(path);

}

}

else

{

if(vet!=null)

{

vet.removeAllElements();

vet.addElement(lastNode);

}

if(vetnew!=null)

{

vetnew.removeAllElements();

vetnew.addElement(path);

}

}

}

else

JOptionPane.showMessageDialog(this,"please select a leaf node!");

}

}

}

public void mouseReleased(MouseEvent e){}

public void dragGestureRecognized(DragGestureEvent e) {

// drag anything ...

e.startDrag(DragSource.DefaultCopyDrop, // cursor

new StringSelection("drag well"), // transferable

this); // drag source listener

drag=true;

}

public void dragDropEnd(DragSourceDropEvent e) {}

public void dragEnter(DragSourceDragEvent e) {}

public void dragExit(DragSourceEvent e) {}

public void dragOver(DragSourceDragEvent e) {}

public void dropActionChanged(DragSourceDragEvent e) {}

 
 
 
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