silverlight richTextBox 文本编辑

最近一段时间一直在做关于文本编辑的东西，发现有篇好文章，原文：http://blog.csdn.net/whitechololate/archive/2010/07/27/5769111.aspx

/// <summary>
        /// 加载右键菜单内容
        /// </summary>
        /// <param name="colorList"></param>
        private void GetMenuMsg(ArrayList colorList)
        {
            ContextMenu cMenu = new ContextMenu();
            richTextBox1.ContextMenu = cMenu;

            MenuItem mItem = new MenuItem();
            mItem.Command  = ApplicationCommands.Cut; 
            cMenu.Items.Add(mItem);

            MenuItem mItem1 = new MenuItem(); 
            mItem1.Command  = ApplicationCommands.Copy;
            cMenu.Items.Add(mItem1);

            MenuItem mItem2 = new MenuItem();
            mItem2.Command  = ApplicationCommands.Paste; //粘贴
            cMenu.Items.Add(mItem2);
         
            MenuItem mItem3 = new MenuItem();
            mItem3.Command  = ApplicationCommands.SelectAll;
            cMenu.Items.Add(mItem3);

            if (colorList.Count >0)
            {
                for (int i = 0; i < colorList.Count; i++)
                {
                    string clo = string.Empty;
                    clo = colorList[i].ToString();
                    switch (clo)
                    {
                        case "1":
                            {
                                MenuItem redItem = new MenuItem();
                                redItem.Header = "红色";
                                cMenu.Items.Add(redItem);
                                redItem.PreviewMouseDown += new MouseButtonEventHandler(redItem_PreviewMouseDown);
                            }
                            break;
                        case "2":
                            {
                               MenuItem buleItem = new MenuItem();
                               buleItem.Header = "蓝色";
                               cMenu.Items.Add(buleItem);
                               buleItem.PreviewMouseDown += new MouseButtonEventHandler(buleItem_PreviewMouseDown);
                            }
                            break;
                        case "3":
                            {
                                MenuItem yellowItem = new MenuItem();
                                yellowItem.Header = "黄色";
                                cMenu.Items.Add(yellowItem);
                                yellowItem.PreviewMouseDown += new MouseButtonEventHandler(yellowItem_PreviewMouseDown);
                            }
                            break;
                        case "4":
                            {
                                MenuItem blackItem = new MenuItem();
                                blackItem.Header = "黑色";
                                cMenu.Items.Add(blackItem);
                                blackItem.PreviewMouseDown += new MouseButtonEventHandler(blackItem_PreviewMouseDown);
                            }
                            break;
                    }
                }
            }  
        }

        void blackItem_PreviewMouseDown(object sender, MouseButtonEventArgs e)
        {
            richTextBox1.Selection.ApplyPropertyValue(TextElement.ForegroundProperty, Brushes.Black);
        }
 
        private void redItem_PreviewMouseDown(object sender, MouseButtonEventArgs e)
        {
            richTextBox1.Selection.ApplyPropertyValue(TextElement.ForegroundProperty, Brushes.Red);
        }

        private void buleItem_PreviewMouseDown(object sender, MouseButtonEventArgs e)
        {
            richTextBox1.Selection.ApplyPropertyValue(TextElement.ForegroundProperty, Brushes.Blue);
        }

        private void yellowItem_PreviewMouseDown(object sender, MouseButtonEventArgs e)
        {        
            richTextBox1.Selection.ApplyPropertyValue(TextElement.ForegroundProperty, Brushes.Yellow);
        }

    /// <summary>
        /// 获取每个元素信息         /// </summary>
        /// <param name="tpoint">起始点</param>
        /// <param name="nePoint">结束点</param>
        private void GetMeg( TextPointer tpoint,TextPointer nePoint)
        {
           
            TextRange trange      = new TextRange(tpoint, nePoint);
            //本元素前字体颜色值
            SolidColorBrush color = (SolidColorBrush)trange.GetPropertyValue(TextElement.ForegroundProperty);
            doText = trange.Text;

             if (color == Brushes.Blue)
             {
                 myColor = "Blue";
             } 
             else if(color == Brushes.Yellow)
             {
                 myColor = "Yellow";
             }
             else if(color == Brushes.Red)
             {
                 myColor = "Red";
             }
            else if (color == Brushes.Black)
            {
                myColor = "Black";
            }
            else
             {
                 myColor = "Black";
            }

            if (doText != string.Empty)
            {//遍历text内容(位置，字体颜色，显示内容），把相关信息存入到数组中

                msgCount++;
                tempV = msgCount + "~~~~~" + myColor + "~~~~~" + doText;
                textAr.Add(tempV);

            }
             
             TextPointer nextPoint = tpoint.GetNextInsertionPosition(LogicalDirection.Forward);//得到下一个元素点
             if (nextPoint != richTextBox1.Document.ContentEnd && nextPoint != null)
             {
                GetMeg(nePoint,nextPoint);
             }
            
        }

    private static void SaveFile(string filename, RichTextBox richTextBox)
        {    //SaveFile("d:\\test.xaml", richTextBox1);
            if (string.IsNullOrEmpty(filename))
            {
                throw new ArgumentNullException();
            }
            using (FileStream stream = File.OpenWrite(filename))
            {
                TextRange documentTextRange = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd);
                string dataFormat = DataFormats.Text;
                string ext = System.IO.Path.GetExtension(filename);
                if (String.Compare(ext, ".xaml", true) == 0)
                {
                    dataFormat = DataFormats.Xaml;
                }
                else if (String.Compare(ext, ".rtf", true) == 0)
                {
                    dataFormat = DataFormats.Rtf;
                }
                documentTextRange.Save(stream, dataFormat);
            }
        }

        private static void LoadFile(string filename, RichTextBox richTextBox)
        {//LoadFile("d:\\test.xaml", richTextBox1);
            if (string.IsNullOrEmpty(filename)) {
                throw new ArgumentNullException();
            }
            if (!File.Exists(filename)) {
                throw new FileNotFoundException();
            }
            using (FileStream stream = File.OpenRead(filename)) {
                TextRange documentTextRange = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd);
                string dataFormat = DataFormats.Text;
                string ext = System.IO.Path.GetExtension(filename);
                if (String.Compare(ext, ".xaml",true) == 0) {
                    dataFormat = DataFormats.Xaml;
                }
                else if (String.Compare(ext, ".rtf", true) == 0) {
                    dataFormat = DataFormats.Rtf;
                }
                documentTextRange.Load(stream, dataFormat);
            }        
        }