dndtree.java

来自「JavaExplorer是一个独立于平台的浏览器」· Java 代码 · 共 217 行

/**
  * File and FTP Explorer
  * Copyright 2002
  * BOESCH Vincent
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * as published by the Free Software Foundation; either version 2
  * of the License, or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  */
package javaexplorer.gui.dnd;

import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.dnd.*;
import java.awt.event.*;

import java.io.IOException;

import javaexplorer.Launcher;

import javaexplorer.gui.treenode.xfile.*;

import javaexplorer.model.*;

import javax.swing.tree.*;


/**
 *@author     BOESCH Vincent
 *@created    21 janvier 2002
 *@version    3.3
 */
public class DNDTree extends XTree implements DropTargetListener,
    DragSourceListener, DragGestureListener {
    private Launcher _launcher = null;

    /**
     *  enables this component to be a dropTarget
     */
    DropTarget dropTarget = null;

    /**
     *  constructor - initializes the DropTarget
     *  and DragSource.
     *
     *@param  launcher  Description of the
     *      Parameter
     */
    public DNDTree(Launcher launcher) {
        super();
        _launcher = launcher;
        dropTarget = new DropTarget(this, this);

        DragGestureRecognizer dgr = _launcher.getDragSource()
                                             .createDragGestureRecognizer(MouseRightDragGestureRecognizer.class,
                this, DnDConstants.ACTION_COPY_OR_MOVE, this);

        if (dgr == null) {
            _launcher.getDragSource().createDefaultDragGestureRecognizer(this,
                DnDConstants.ACTION_COPY_OR_MOVE, this);
        }

        this.addMouseListener(new MouseAdapter() {
            });
    }

    /**
     *  this message goes to DragSourceListener,
     *  informing it that the dragging has
     *  ended
     *
     *@param  event  Description of the Parameter
     */
    public void dragDropEnd(DragSourceDropEvent event) {
    }

    /**
     *  is invoked when you are dragging over
     *  the DropSite
     *
     *@param  event  Description of the Parameter
     */
    public void dragEnter(DropTargetDragEvent event) {
        event.acceptDrag(DnDConstants.ACTION_COPY_OR_MOVE);
    }

    /**
     *  this message goes to DragSourceListener,
     *  informing it that the dragging has
     *  entered the DropSite
     *
     *@param  event  Description of the Parameter
     */
    public void dragEnter(DragSourceDragEvent event) {
    }

    /**
     *  is invoked when you are exit the DropSite
     *  without dropping
     *
     *@param  event  Description of the Parameter
     */
    public void dragExit(DropTargetEvent event) {
    }

    /**
     *  this message goes to DragSourceListener,
     *  informing it that the dragging has
     *  exited the DropSite
     *
     *@param  event  Description of the Parameter
     */
    public void dragExit(DragSourceEvent event) {
    }

    /**
     *  a drag gesture has been initiated
     *
     *@param  event  Description of the Parameter
     */
    public void dragGestureRecognized(DragGestureEvent event) {
        TreePath[] tb_tp = getSelectionPaths();

        if (tb_tp == null) {
            return;
        }

        XFile[] tbxf = new XFile[tb_tp.length];
        XFileTreeNode jftn = null;

        for (int i = 0; i < tb_tp.length; i++) {
            jftn = (XFileTreeNode) tb_tp[i].getLastPathComponent();

            if (jftn != null) {
                tbxf[i] = jftn.getXFile();
            }
        }

        XFTransferable xft = new XFTransferable(tbxf);

        // as the name suggests, starts the dragging
        _launcher.getDragSource().startDrag(event, DragSource.DefaultMoveDrop,
            xft, this);
    }

    /**
     *  is invoked when a drag operation is
     *  going on
     *
     *@param  event  Description of the Parameter
     */
    public void dragOver(DropTargetDragEvent event) {
    }

    /**
     *  this message goes to DragSourceListener,
     *  informing it that the dragging is currently
     *  ocurring over the DropSite
     *
     *@param  event  Description of the Parameter
     */
    public void dragOver(DragSourceDragEvent event) {
    }

    /**
     *  a drop has occurred
     *
     *@param  event  Description of the Parameter
     */
    public void drop(DropTargetDropEvent event) {
        XFile[] tbxf = null;
        XFile f = null;
        Point p = null;

        try {
            p = event.getLocation();

            XFileTreeNode jftn = null;

            if (getRowCount() == 0) {
                jftn = (XFileTreeNode) getModel().getRoot();
            } else {
                TreePath tp = getClosestPathForLocation(p.x, p.y);
                jftn = (XFileTreeNode) tp.getLastPathComponent();
            }

            if (jftn != null) {
                f = jftn.getXFile();
            }

            if (f == null) {
                return;
            }

            if (!f.isDirectory()) {
                f = f.getXParent();
            }

            Transferable transferable = event.getTransferable();

            // we accept only Strings
            if (transferable.isDataFlavorSupported(DataFlavor.stringFlavor)) {
                event.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
                tbxf = (XFile[]) transferable.getTransferData(DataFlavor.stringFlavor);
                f.setLauncher(_launcher);

                //Fin du drop pour mise