frienddragsourcelistener.java

java写的qq代码实现qq的部分功能

/*
* LumaQQ - Java QQ Client
*
* Copyright (C) 2004 luma <[e-mail]>
*
* 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 edu.tsinghua.lumaqq.events;

import org.eclipse.swt.dnd.DragSource;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.DragSourceListener;

import edu.tsinghua.lumaqq.models.ClusterModel;
import edu.tsinghua.lumaqq.models.FriendModel;
import edu.tsinghua.lumaqq.models.IQQNode;
import edu.tsinghua.swt.widgets.CoolButton;

/**
 * 拖动一个好友时的监听器
 * 
 * @author 马若劼
 */
public class FriendDragSourceListener implements DragSourceListener {
	private Integer qq;
	
	/* (non-Javadoc)
	 * @see org.eclipse.swt.dnd.DragSourceListener#dragStart(org.eclipse.swt.dnd.DragSourceEvent)
	 */
	public void dragStart(DragSourceEvent e) {
		// 得到view part
		CoolButton viewPart = (CoolButton)((DragSource)e.getSource()).getControl();
		// 得到data
		Object obj = viewPart.getData();
		// 判断data是否一个ClusterModel，如果是，返回，因为我们不允许拖动一个组
		if(obj instanceof ClusterModel) {
			e.doit = false;
		} else {
			FriendModel f = (FriendModel)obj;
			qq = (Integer)f.getProperty(IQQNode.QQ_NUMBER);
			e.doit = true;			
		}
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.swt.dnd.DragSourceListener#dragSetData(org.eclipse.swt.dnd.DragSourceEvent)
	 */
	public void dragSetData(DragSourceEvent e) {
		e.data = qq.toString();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.swt.dnd.DragSourceListener#dragFinished(org.eclipse.swt.dnd.DragSourceEvent)
	 */
	public void dragFinished(DragSourceEvent e) {
	    // 没有什么要做的
	}
}