/*
 * TextAreaTransferHandler.java - Drag and drop support
 * :tabSize=8:indentSize=8:noTabs=false:
 * :folding=explicit:collapseFolds=1:
 *
 * Copyright (C) 2004 Slava Pestov
 *
 * 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 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 org.gjt.sp.jedit.textarea;

//{{{ Imports
import javax.swing.*;
import java.awt.dnd.*;
import java.awt.*;
import org.gjt.sp.jedit.buffer.JEditBuffer;
import org.gjt.sp.util.Log;
//}}}

/**
 * @author Slava Pestov
 * @version $Id: TextAreaDropHandler.java 17040 2010-01-23 14:19:47Z k_satoda $
 */
class TextAreaDropHandler extends DropTargetAdapter
{
	private final TextArea textArea;
	private JEditBuffer savedBuffer;
	private int savedCaret;

	//{{{ TextAreaDropHandler constructor
	TextAreaDropHandler(TextArea textArea)
	{
		this.textArea = textArea;
	} //}}}

	//{{{ dragEnter() method
	@Override
	public void dragEnter(DropTargetDragEvent dtde)
	{
		Log.log(Log.DEBUG,this,"Drag enter");
		savedBuffer = textArea.getBuffer();
		//textArea.getBuffer().beginCompoundEdit();
		savedCaret = textArea.getCaretPosition();
	} //}}}

	//{{{ dragOver() method
	@Override
	public void dragOver(DropTargetDragEvent dtde)
	{
		Point p = dtde.getLocation();
		p = SwingUtilities.convertPoint(textArea,p,
			textArea.getPainter());
		int pos = textArea.xyToOffset(p.x,p.y,
			!(textArea.getPainter().isBlockCaretEnabled()
			|| textArea.isOverwriteEnabled()));
		if(pos != -1)
		{
			textArea.moveCaretPosition(pos,
				TextArea.ELECTRIC_SCROLL);
		}
	} //}}}

	//{{{ dragExit() method
	@Override
	public void dragExit(DropTargetEvent dtde)
	{
		Log.log(Log.DEBUG,this,"Drag exit");
		//textArea.getBuffer().endCompoundEdit();
		if(textArea.getBuffer() == savedBuffer)
		{
			textArea.moveCaretPosition(savedCaret,
				TextArea.ELECTRIC_SCROLL);
		}
		savedBuffer = null;
	} //}}}

	//{{{ drop() method
	public void drop(DropTargetDropEvent dtde)
	{
		Log.log(Log.DEBUG,this,"Drop");
		//textArea.getBuffer().endCompoundEdit();
		savedBuffer = null;
	} //}}}
}
