richtextboxextended.cs

C#编写文本编辑器源码

			// 
			this.mi24.Index = 10;
			this.mi24.Text = "24";
			this.mi24.Click += new System.EventHandler(this.FontSize_Click);
			// 
			// mi26
			// 
			this.mi26.Index = 11;
			this.mi26.Text = "26";
			this.mi26.Click += new System.EventHandler(this.FontSize_Click);
			// 
			// mi28
			// 
			this.mi28.Index = 12;
			this.mi28.Text = "28";
			this.mi28.Click += new System.EventHandler(this.FontSize_Click);
			// 
			// mi36
			// 
			this.mi36.Index = 13;
			this.mi36.Text = "36";
			this.mi36.Click += new System.EventHandler(this.FontSize_Click);
			// 
			// mi48
			// 
			this.mi48.Index = 14;
			this.mi48.Text = "48";
			this.mi48.Click += new System.EventHandler(this.FontSize_Click);
			// 
			// mi72
			// 
			this.mi72.Index = 15;
			this.mi72.Text = "72";
			this.mi72.Click += new System.EventHandler(this.FontSize_Click);
			// 
			// tbbColor
			// 
			this.tbbColor.DropDownMenu = this.cmColors;
			this.tbbColor.ImageIndex = 7;
			this.tbbColor.Style = System.Windows.Forms.ToolBarButtonStyle.DropDownButton;
			this.tbbColor.Tag = "color";
			// 
			// cmColors
			// 
			this.cmColors.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																					 this.miBlack,
																					 this.miBlue,
																					 this.miRed,
																					 this.miGreen});
			// 
			// miBlack
			// 
			this.miBlack.Index = 0;
			this.miBlack.Text = "Black";
			this.miBlack.Click += new System.EventHandler(this.Color_Click);
			// 
			// miBlue
			// 
			this.miBlue.Index = 1;
			this.miBlue.Text = "Blue";
			this.miBlue.Click += new System.EventHandler(this.Color_Click);
			// 
			// miRed
			// 
			this.miRed.Index = 2;
			this.miRed.Text = "Red";
			this.miRed.Click += new System.EventHandler(this.Color_Click);
			// 
			// miGreen
			// 
			this.miGreen.Index = 3;
			this.miGreen.Text = "Green";
			this.miGreen.Click += new System.EventHandler(this.Color_Click);
			// 
			// tbbSeparator5
			// 
			this.tbbSeparator5.Style = System.Windows.Forms.ToolBarButtonStyle.Separator;
			// 
			// tbbBold
			// 
			this.tbbBold.ImageIndex = 0;
			this.tbbBold.Style = System.Windows.Forms.ToolBarButtonStyle.ToggleButton;
			this.tbbBold.Tag = "bold";
			// 
			// tbbItalic
			// 
			this.tbbItalic.ImageIndex = 1;
			this.tbbItalic.Style = System.Windows.Forms.ToolBarButtonStyle.ToggleButton;
			this.tbbItalic.Tag = "italic";
			// 
			// tbbUnderline
			// 
			this.tbbUnderline.ImageIndex = 2;
			this.tbbUnderline.Style = System.Windows.Forms.ToolBarButtonStyle.ToggleButton;
			this.tbbUnderline.Tag = "underline";
			// 
			// tbbStrikeout
			// 
			this.tbbStrikeout.ImageIndex = 3;
			this.tbbStrikeout.Style = System.Windows.Forms.ToolBarButtonStyle.ToggleButton;
			this.tbbStrikeout.Tag = "strikeout";
			// 
			// tbbSeparator1
			// 
			this.tbbSeparator1.Style = System.Windows.Forms.ToolBarButtonStyle.Separator;
			// 
			// tbbLeft
			// 
			this.tbbLeft.ImageIndex = 4;
			this.tbbLeft.Style = System.Windows.Forms.ToolBarButtonStyle.ToggleButton;
			this.tbbLeft.Tag = "left";
			// 
			// tbbCenter
			// 
			this.tbbCenter.ImageIndex = 5;
			this.tbbCenter.Style = System.Windows.Forms.ToolBarButtonStyle.ToggleButton;
			this.tbbCenter.Tag = "center";
			// 
			// tbbRight
			// 
			this.tbbRight.ImageIndex = 6;
			this.tbbRight.Style = System.Windows.Forms.ToolBarButtonStyle.ToggleButton;
			this.tbbRight.Tag = "right";
			// 
			// tbbSeparator2
			// 
			this.tbbSeparator2.Style = System.Windows.Forms.ToolBarButtonStyle.Separator;
			// 
			// tbbUndo
			// 
			this.tbbUndo.ImageIndex = 12;
			this.tbbUndo.Tag = "undo";
			// 
			// tbbRedo
			// 
			this.tbbRedo.ImageIndex = 13;
			this.tbbRedo.Tag = "redo";
			// 
			// tbbSeparator4
			// 
			this.tbbSeparator4.Style = System.Windows.Forms.ToolBarButtonStyle.Separator;
			// 
			// tbbCut
			// 
			this.tbbCut.ImageIndex = 17;
			this.tbbCut.Tag = "cut";
			// 
			// tbbCopy
			// 
			this.tbbCopy.ImageIndex = 18;
			this.tbbCopy.Tag = "copy";
			// 
			// tbbPaste
			// 
			this.tbbPaste.ImageIndex = 19;
			this.tbbPaste.Tag = "paste";
			// 
			// tbbStamp
			// 
			this.tbbStamp.ImageIndex = 8;
			this.tbbStamp.Tag = "edit stamp";
			// 
			// imgList1
			// 
			this.imgList1.ColorDepth = System.Windows.Forms.ColorDepth.Depth32Bit;
			this.imgList1.ImageSize = new System.Drawing.Size(16, 16);
			this.imgList1.ImageStream = ((System.Windows.Forms.ImageListStreamer)(resources.GetObject("imgList1.ImageStream")));
			this.imgList1.TransparentColor = System.Drawing.Color.Transparent;
			// 
			// rtb1
			// 
			this.rtb1.AutoWordSelection = true;
			this.rtb1.Dock = System.Windows.Forms.DockStyle.Fill;
			this.rtb1.Location = new System.Drawing.Point(0, 26);
			this.rtb1.Name = "rtb1";
			this.rtb1.Size = new System.Drawing.Size(504, 198);
			this.rtb1.TabIndex = 1;
			this.rtb1.Text = "";
			this.rtb1.KeyDown += new System.Windows.Forms.KeyEventHandler(this.rtb1_KeyDown);
			this.rtb1.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.rtb1_KeyPress);
			this.rtb1.LinkClicked += new System.Windows.Forms.LinkClickedEventHandler(this.rtb1_LinkClicked);
			this.rtb1.SelectionChanged += new System.EventHandler(this.rtb1_SelectionChanged);
			// 
			// ofd1
			// 
			this.ofd1.DefaultExt = "rtf";
			this.ofd1.Filter = "Rich Text Files|*.rtf|Plain Text File|*.txt";
			this.ofd1.Title = "Open File";
			// 
			// sfd1
			// 
			this.sfd1.DefaultExt = "rtf";
			this.sfd1.Filter = "Rich Text File|*.rtf|Plain Text File|*.txt";
			this.sfd1.Title = "Save As";
			// 
			// RichTextBoxExtended
			// 
			this.Controls.Add(this.rtb1);
			this.Controls.Add(this.tb1);
			this.Name = "RichTextBoxExtended";
			this.Size = new System.Drawing.Size(504, 224);
			this.ResumeLayout(false);

		}
		#endregion

		#region Selection Change event	
		[Description("Occurs when the selection is changed"),
		Category("Behavior")]
		// Raised in tb1 SelectionChanged event so that user can do useful things
		public event System.EventHandler SelChanged;
		#endregion

		#region Stamp Event Stuff
		[Description("Occurs when the stamp button is clicked"), 
		 Category("Behavior")]
		public event System.EventHandler Stamp;
        
		/// <summary>
		/// OnStamp event
		/// </summary>
		protected virtual void OnStamp(EventArgs e)
		{
			if(Stamp != null)
				Stamp(this, e);

			switch(StampAction)
			{
				case StampActions.EditedBy:
				{
					StringBuilder stamp = new StringBuilder(""); //holds our stamp text
					if(rtb1.Text.Length > 0) stamp.Append("\r\n\r\n"); //add two lines for space
					stamp.Append("Edited by "); 
					//use the CurrentPrincipal name if one exsist else use windows logon username
					if(Thread.CurrentPrincipal == null || Thread.CurrentPrincipal.Identity == null || Thread.CurrentPrincipal.Identity.Name.Length <= 0)
						stamp.Append(Environment.UserName);
					else
						stamp.Append(Thread.CurrentPrincipal.Identity.Name);
					stamp.Append(" on " + DateTime.Now.ToLongDateString() + "\r\n");
			
					rtb1.SelectionLength = 0; //unselect everything basicly
					rtb1.SelectionStart = rtb1.Text.Length; //start new selection at the end of the text
					rtb1.SelectionColor = this.StampColor; //make the selection blue
					rtb1.SelectionFont = new Font(rtb1.SelectionFont, FontStyle.Bold); //set the selection font and style
					rtb1.AppendText(stamp.ToString()); //add the stamp to the richtextbox
					rtb1.Focus(); //set focus back on the richtextbox
				} break; //end edited by stamp
				case StampActions.DateTime:
				{
					StringBuilder stamp = new StringBuilder(""); //holds our stamp text
					if(rtb1.Text.Length > 0) stamp.Append("\r\n\r\n"); //add two lines for space
					stamp.Append(DateTime.Now.ToLongDateString() + "\r\n");
					rtb1.SelectionLength = 0; //unselect everything basicly
					rtb1.SelectionStart = rtb1.Text.Length; //start new selection at the end of the text
					rtb1.SelectionColor = this.StampColor; //make the selection blue
					rtb1.SelectionFont = new Font(rtb1.SelectionFont, FontStyle.Bold); //set the selection font and style
					rtb1.AppendText(stamp.ToString()); //add the stamp to the richtextbox
					rtb1.Focus(); //set focus back on the richtextbox
				} break;
			} //end select
		}
		#endregion

		#region Toolbar button click
		/// <summary>
		///     Handler for the toolbar button click event
		/// </summary>
		private void tb1_ButtonClick(object sender, System.Windows.Forms.ToolBarButtonClickEventArgs e)
		{
			// true if style to be added
			// false to remove style
			bool add = e.Button.Pushed;	
					
			//Switch based on the tag of the button pressed
			switch(e.Button.Tag.ToString().ToLower())
			{
				case "bold": 
					ChangeFontStyle(FontStyle.Bold,add);
					break;
				case "italic": 
					ChangeFontStyle(FontStyle.Italic,add);
					break;
				case "underline":
					ChangeFontStyle(FontStyle.Underline,add);
					break;
				case "strikeout":
					ChangeFontStyle(FontStyle.Strikeout,add);
					break;
				case "left":
					//change horizontal alignment to left
					rtb1.SelectionAlignment = HorizontalAlignment.Left;
					tbbCenter.Pushed = false;
					tbbRight.Pushed = false;
					break;
				case "center":
					//change horizontal alignment to center
					tbbLeft.Pushed = false;
					rtb1.SelectionAlignment = HorizontalAlignment.Center;
					tbbRight.Pushed = false;
					break;
				case "right":
					//change horizontal alignment to right
					tbbLeft.Pushed = false;
					tbbCenter.Pushed = false;
					rtb1.SelectionAlignment = HorizontalAlignment.Right;
					break;
				case "edit stamp":
                    OnStamp(new EventArgs()); //send stamp event
					break;
				case "color":
					rtb1.SelectionColor = Color.Black;
					break;
				case "undo":
					rtb1.Undo();
					break;
				case "redo":
					rtb1.Redo();
					break;
				case "open":
					try
					{
						if (ofd1.ShowDialog() == DialogResult.OK && ofd1.FileName.Length > 0)
							if(System.IO.Path.GetExtension(ofd1.FileName).ToLower().Equals(".rtf")) 
								rtb1.LoadFile(ofd1.FileName, RichTextBoxStreamType.RichText);
							else
								rtb1.LoadFile(ofd1.FileName, RichTextBoxStreamType.PlainText);
					}
					catch (ArgumentException ae)
					{
						if(ae.Message == "Invalid file format.")
							MessageBox.Show("There was an error loading the file: " + ofd1.FileName);				
					}
					break;
				case "save":
					if(sfd1.ShowDialog() == DialogResult.OK && sfd1.FileName.Length > 0)
						if(System.IO.Path.GetExtension(sfd1.FileName).ToLower().Equals(".rtf"))
							rtb1.SaveFile(sfd1.FileName);
						else
							rtb1.SaveFile(sfd1.FileName, RichTextBoxStreamType.PlainText);
					break;
				case "cut":
				{
					if(rtb1.SelectedText.Length <= 0) break;
					rtb1.Cut();
					break;
				}
				case "copy":
				{
					if(rtb1.SelectedText.Length <= 0) break;
					rtb1.Copy();
					break;
				}
				case "paste":
				{
					try
					{
						rtb1.Paste();
					}
					catch
					{
						MessageBox.Show("Paste Failed");
					}
					break;
				}
			} //end select
		}
		#endregion

		#region Update Toolbar
		/// <summary>
		///     Update the toolbar button statuses
		/// </summary>
		public void UpdateToolbar()
		{
			// Get the font, fontsize and style to apply to the toolbar buttons
			Font fnt = GetFontDetails();
			// Set font style buttons to the styles applying to the entire selection
			FontStyle style = fnt.Style;
			
			//Set all the style buttons using the gathered style
			tbbBold.Pushed		= fnt.Bold; //bold button
			tbbItalic.Pushed	= fnt.Italic; //italic button
			tbbUnderline.Pushed	= fnt.Underline; //underline button