sharptextareaclipboardhandler.cs

c#精彩编程百例（源代码）

//  SharpTextAreaClipboardHandler.cs
//  Copyright (C) 2001 Mike Krueger
//  Copyright (C) 2001 Andrea Paatz
//
//  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

using System;
using System.Drawing;
using System.Windows.Forms;

namespace SharpDevelop.Gui.Edit.Text {
	
	/// <summary>
	/// The clipboard handler of the textarea.
	/// </summary>
	public class SharpTextAreaClipboardHandler : ISdClipboardHandable
	{
		TextAreaControl sharptextarea;
		public SharpTextAreaClipboardHandler(TextAreaControl sharptextarea)
		{
			this.sharptextarea = sharptextarea;
		}
		
		public void Cut(object sender, EventArgs e)
		{
			if (sharptextarea.Selection.HasSomethingSelected && !sharptextarea.Buffer.ReadOnly) {
				string str = sharptextarea.Buffer.Delete(sharptextarea.Selection.SelectionStart, sharptextarea.Selection.SelectionEnd);
				sharptextarea.Caret.CaretPos = sharptextarea.Selection.RealStart;				
				sharptextarea.Selection.SetNoSelection();
				
				sharptextarea.UpdateToEnd(sharptextarea.Caret.CaretPos.Y);
				sharptextarea.Caret.SetUpDownPos();
				
				// paste to clipboard
				Clipboard.SetDataObject(new DataObject(DataFormats.Text, str));
			}
		}
		
		public void Copy(object sender, EventArgs e)
		{
			Clipboard.SetDataObject(new DataObject(DataFormats.Text, sharptextarea.Buffer.GetText(sharptextarea.Selection.SelectionStart, sharptextarea.Selection.SelectionEnd)));
		}
		
		public void Paste(object sender, EventArgs e)
		{
			IDataObject data = Clipboard.GetDataObject();
			if (data.GetDataPresent(DataFormats.Text)) {
				string text = (string)data.GetData(DataFormats.Text);
				if (!text.Equals("")) {
					Delete(sender, e);
					int y = sharptextarea.Caret.CaretPos.Y;
					
					sharptextarea.Caret.CaretPos = sharptextarea.Buffer.Insert(sharptextarea.Caret.CaretPos, text);
					
					if (y != sharptextarea.Caret.CaretPos.Y) {
						sharptextarea.UpdateToEnd(y);
					} else {
						sharptextarea.UpdateLines(y, y);
					}
				}
			}
		}
		
		public void Delete(object sender, EventArgs e)
		{
			if (sharptextarea.Selection.HasSomethingSelected && !sharptextarea.Buffer.ReadOnly) {
				sharptextarea.Buffer.Delete(sharptextarea.Selection.SelectionStart, 
					                        sharptextarea.Selection.SelectionEnd);
				sharptextarea.Caret.CaretPos = sharptextarea.Selection.RealStart;
				
				
				sharptextarea.Selection.SetNoSelection();
				sharptextarea.UpdateToEnd(sharptextarea.Caret.CaretPos.Y);
				sharptextarea.Caret.SetUpDownPos();
			}
		}
		
		public void SelectAll(object sender, EventArgs e)
		{
			Point start = new Point (0, 0);
			Point end   = new Point (sharptextarea.Buffer[sharptextarea.Buffer.Length -1].Text.Length, sharptextarea.Buffer.Length - 1);
			if (start != sharptextarea.Selection.SelectionStart || end != sharptextarea.Selection.SelectionEnd) {
//				sharptextarea.OldSelectionStart = 
					sharptextarea.Selection.SelectionStart = start;
//				sharptextarea.OldSelectionEnd   = 
					sharptextarea.Selection.SelectionEnd   = end;
//				sharptextarea.ScrollToCaret();
				sharptextarea.Refresh();
			}
		}
	}
}