textarea.cs

c#源代码

				textView.DrawingPosition = textViewArea;
			}
			if (clipRectangle.IntersectsWith(textViewArea)) {
				textViewArea.Intersect(clipRectangle);
				if (!textViewArea.IsEmpty) {
					try {
						textView.Paint(g, textViewArea);
					} catch (Exception ex) {
						Console.WriteLine("Got exception : " + ex);
					}
				}
			}
			
			if (adjustScrollBars) {
				try {
					this.motherTextAreaControl.AdjustScrollBars(null, null);
				} catch (Exception) {}
			}
			
			try {
				Caret.UpdateCaretPosition();
			} catch (Exception) {}
			
			base.OnPaint(e);
		}
		void DocumentFoldingsChanged(object sender, EventArgs e)
		{
			this.motherTextAreaControl.AdjustScrollBars(null, null);
		}
		
		#region keyboard handling methods
		
		/// <summary>
		/// This method is called on each Keypress
		/// </summary>
		/// <returns>
		/// True, if the key is handled by this method and should NOT be
		/// inserted in the textarea.
		/// </returns>
		protected virtual bool HandleKeyPress(char ch)
		{
			if (KeyEventHandler != null) {
				return KeyEventHandler(ch);
			}
			return false;
		}
		
		public void SimulateKeyPress(char ch)
		{
			if (Document.ReadOnly) {
				return;
			}

			if (TextEditorProperties.UseCustomLine == true) {
				if (SelectionManager.HasSomethingSelected) {
					if (Document.CustomLineManager.IsReadOnly(SelectionManager.SelectionCollection[0], false))
						return;
				} else if (Document.CustomLineManager.IsReadOnly(Caret.Line, false) == true)
					return;
			}
			
			if (ch < ' ') {
				return;
			}
			
			if (!HiddenMouseCursor && TextEditorProperties.HideMouseCursor) {
				HiddenMouseCursor = true;
				Cursor.Hide();
			}
			
			if (!HandleKeyPress(ch)) {
				motherTextEditorControl.BeginUpdate();
				switch (Caret.CaretMode) 
				{
					case CaretMode.InsertMode:
						InsertChar(ch);
						break;
					case CaretMode.OverwriteMode:
						ReplaceChar(ch);
						break;
					default:
						Debug.Assert(false, "Unknown caret mode " + Caret.CaretMode);
						break;
				}
				int currentLineNr = Caret.Line;
				int delta = Document.FormattingStrategy.FormatLine(this, currentLineNr, Document.PositionToOffset(Caret.Position), ch);
			
				motherTextEditorControl.EndUpdate();
			}
		}
		
		protected override void OnKeyPress(System.Windows.Forms.KeyPressEventArgs e)
		{
			base.OnKeyPress(e);
			SimulateKeyPress(e.KeyChar);
		}
		
		/// <summary>
		/// This method executes a dialog key
		/// </summary>
		public bool ExecuteDialogKey(Keys keyData)
		{
			// try, if a dialog key processor was set to use this
			if (DoProcessDialogKey != null && DoProcessDialogKey(keyData)) {
				return true;
			}
			
			if (keyData == Keys.Back || keyData == Keys.Delete || keyData == Keys.Enter) {
				if (TextEditorProperties.UseCustomLine == true) {
					if (SelectionManager.HasSomethingSelected) {
						if (Document.CustomLineManager.IsReadOnly(SelectionManager.SelectionCollection[0], false))
							return true;
					} else {
						int curLineNr   = Document.GetLineNumberForOffset(Caret.Offset);
						if (Document.CustomLineManager.IsReadOnly(curLineNr, false) == true)
							return true;
						if ((Caret.Column == 0) && (curLineNr - 1 >= 0) && keyData == Keys.Back &&
							Document.CustomLineManager.IsReadOnly(curLineNr - 1, false) == true)
							return true;
						if (keyData == Keys.Delete) {
							LineSegment curLine = Document.GetLineSegment(curLineNr);
							if (curLine.Offset + curLine.Length == Caret.Offset && 
								Document.CustomLineManager.IsReadOnly(curLineNr + 1, false) == true) {
								return true;
							}
						}
					}
				}
			}
			
			// if not (or the process was 'silent', use the standard edit actions
			IEditAction action =  motherTextEditorControl.GetEditAction(keyData);
			AutoClearSelection = true;
			if (action != null) {
				motherTextEditorControl.BeginUpdate();
				try {
					lock (Document) {
						action.Execute(this);
						if (SelectionManager.HasSomethingSelected && AutoClearSelection /*&& caretchanged*/) {
							if (Document.TextEditorProperties.DocumentSelectionMode == DocumentSelectionMode.Normal) {
								SelectionManager.ClearSelection();
							}
						}
					}
				} catch (Exception e) {
					Console.WriteLine("Got Exception while executing action " + action + " : " + e.ToString());
				} finally {
					motherTextEditorControl.EndUpdate();
					Caret.UpdateCaretPosition();
				}
				return true;
			} 
			return false;
		}
		
		protected override bool ProcessDialogKey(Keys keyData)
		{
			return ExecuteDialogKey(keyData) || base.ProcessDialogKey(keyData);
		}
		#endregion
		
		public void ScrollToCaret()
		{
			motherTextAreaControl.ScrollToCaret();
		}
		
		public void ScrollTo(int line)
		{
			motherTextAreaControl.ScrollTo(line);
		}
		
		public void BeginUpdate()
		{
			motherTextEditorControl.BeginUpdate();
		}
		
		public void EndUpdate()
		{
			motherTextEditorControl.EndUpdate();
		}
		
		string GenerateWhitespaceString(int length)
		{
			return new String(' ', length);
		}

		public bool EnableCutOrPaste
		{
			get {
				if ( motherTextEditorControl == null)
					return false;
				if (TextEditorProperties.UseCustomLine == true) {
					if (SelectionManager.HasSomethingSelected == true) {
						if (Document.CustomLineManager.IsReadOnly(SelectionManager.SelectionCollection[0], false))
							return false;
					}
					if (Document.CustomLineManager.IsReadOnly(Caret.Line, false) == true)
						return false;
				}
				return true;
				
			}
		}
		/// <remarks>
		/// Inserts a single character at the caret position
		/// </remarks>
		public void InsertChar(char ch)
		{
			bool updating = motherTextEditorControl.IsUpdating;
			if (!updating) {
				BeginUpdate();
			}
			
			// filter out forgein whitespace chars and replace them with standard space (ASCII 32)
			if (Char.IsWhiteSpace(ch) && ch != '\t' && ch != '\n') {
				ch = ' ';
			}
			bool removedText = false;
			if (Document.TextEditorProperties.DocumentSelectionMode == DocumentSelectionMode.Normal &&
			    SelectionManager.SelectionCollection.Count > 0) {
				Caret.Position = SelectionManager.SelectionCollection[0].StartPosition;
				SelectionManager.RemoveSelectedText();
				removedText = true;
			}
			LineSegment caretLine = Document.GetLineSegment(Caret.Line);
			int offset = Caret.Offset;
			// use desired column for generated whitespaces
			int dc=Math.Min(Caret.Column,Caret.DesiredColumn);
			if (caretLine.Length < dc && ch != '\n') {
				Document.Insert(offset, GenerateWhitespaceString(dc - caretLine.Length) + ch);
			} else {
				Document.Insert(offset, ch.ToString());
			}
			++Caret.Column;
			
			if (removedText) {
				Document.UndoStack.UndoLast(2);
			}
			
			if (!updating) {
				EndUpdate();
				UpdateLineToEnd(Caret.Line, Caret.Column);
			}
			
			// I prefer to set NOT the standard column, if you type something
//			++Caret.DesiredColumn;
		}
		
		/// <remarks>
		/// Inserts a whole string at the caret position
		/// </remarks>
		public void InsertString(string str)
		{
			bool updating = motherTextEditorControl.IsUpdating;
			if (!updating) {
				BeginUpdate();
			}
			try {
				bool removedText = false;
				if (Document.TextEditorProperties.DocumentSelectionMode == DocumentSelectionMode.Normal &&
				    SelectionManager.SelectionCollection.Count > 0) {
					Caret.Position = SelectionManager.SelectionCollection[0].StartPosition;
					SelectionManager.RemoveSelectedText();
					removedText = true;
				}
				
				int oldOffset = Document.PositionToOffset(Caret.Position);
				int oldLine   = Caret.Line;
				LineSegment caretLine = Document.GetLineSegment(Caret.Line);
				if (caretLine.Length < Caret.Column) {
					int whiteSpaceLength = Caret.Column - caretLine.Length;
					Document.Insert(oldOffset, GenerateWhitespaceString(whiteSpaceLength) + str);
					Caret.Position = Document.OffsetToPosition(oldOffset + str.Length + whiteSpaceLength);
				} else {
					Document.Insert(oldOffset, str);
					Caret.Position = Document.OffsetToPosition(oldOffset + str.Length);
				}
				if (removedText) {
					Document.UndoStack.UndoLast(2);
				}
				if (oldLine != Caret.Line) {
					UpdateToEnd(oldLine);
				} else {
					UpdateLineToEnd(Caret.Line, Caret.Column);
				}
			} finally {
				if (!updating) {
					EndUpdate();
				}
			}
		}
		
		/// <remarks>
		/// Replaces a char at the caret position
		/// </remarks>
		public void ReplaceChar(char ch)
		{
			bool updating = motherTextEditorControl.IsUpdating;
			if (!updating) {
				BeginUpdate();
			}
			if (Document.TextEditorProperties.DocumentSelectionMode == DocumentSelectionMode.Normal && SelectionManager.SelectionCollection.Count > 0) {
				Caret.Position = SelectionManager.SelectionCollection[0].StartPosition;
				SelectionManager.RemoveSelectedText();
			}
			
			int lineNr   = Caret.Line;
			LineSegment  line = Document.GetLineSegment(lineNr);
			int offset = Document.PositionToOffset(Caret.Position);
			if (offset < line.Offset + line.Length) {
				Document.Replace(offset, 1, ch.ToString());
			} else {
				Document.Insert(offset, ch.ToString());
			}
			if (!updating) {
				EndUpdate();
				UpdateLineToEnd(lineNr, Caret.Column);
			}
			++Caret.Column;
//			++Caret.DesiredColumn;
		}
		
		
		protected override void Dispose(bool disposing)
		{
			base.Dispose(disposing);
			if (disposing) {
				if (caret != null) {
					caret.PositionChanged -= new EventHandler(SearchMatchingBracket);
					caret.Dispose();
					caret = null;
				}
				if (selectionManager != null) {
					selectionManager.Dispose();
					selectionManager = null;
				}
				Document.TextContentChanged -= new EventHandler(TextContentChanged);
				Document.FoldingManager.FoldingsChanged -= new EventHandler(DocumentFoldingsChanged);
				motherTextAreaControl = null;
				motherTextEditorControl = null;
				gutterMargin.Dispose();
				textView.Dispose();
				toolTip.Dispose();
			}
		}
		
#region UPDATE Commands		
		internal void UpdateLine(int line)
		{
			UpdateLines(0, line, line);
		}
		
		internal void UpdateLines(int lineBegin, int lineEnd)
		{
			UpdateLines(0, lineBegin, lineEnd);
		}
	
		internal void UpdateToEnd(int lineBegin) 
		{
//			if (lineBegin > FirstPhysicalLine + textView.VisibleLineCount) {
//				return;
//			}
			
			lineBegin     = Math.Min(lineBegin, FirstPhysicalLine);
			int y         = Math.Max(    0, (int)(lineBegin * textView.FontHeight));
			y = Math.Max(0, y - this.virtualTop.Y);
			Rectangle r = new Rectangle(0,
			                            y, 
			                            Width, 
			                            Height - y);
			Invalidate(r);
		}
		
		internal void UpdateLineToEnd(int lineNr, int xStart)
		{
			UpdateLines(xStart, lineNr, lineNr);
		}
		
		internal void UpdateLine(int line, int begin, int end)
		{
			UpdateLines(line, line);
		}
		int FirstPhysicalLine {
			get {
				return VirtualTop.Y / textView.FontHeight;
			}
		}
		internal void UpdateLines(int xPos, int lineBegin, int lineEnd)
		{
//			if (lineEnd < FirstPhysicalLine || lineBegin > FirstPhysicalLine + textView.VisibleLineCount) {
//				return;
//			}
			
			InvalidateLines((int)(xPos * this.TextView.GetWidth(' ')), lineBegin, lineEnd);
		}
		
		void InvalidateLines(int xPos, int lineBegin, int lineEnd)
		{
			lineBegin     = Math.Max(Document.GetVisibleLine(lineBegin), FirstPhysicalLine);
			lineEnd       = Math.Min(Document.GetVisibleLine(lineEnd),   FirstPhysicalLine + textView.VisibleLineCount);
			int y         = Math.Max(    0, (int)(lineBegin  * textView.FontHeight));
			int height    = Math.Min(textView.DrawingPosition.Height, (int)((1 + lineEnd - lineBegin) * (textView.FontHeight + 1)));
			
			Rectangle r = new Rectangle(0,
			                            y - 1 - this.virtualTop.Y, 
			                            Width, 
			                            height + 3);
			
			Invalidate(r);
		}
#endregion
		public event KeyEventHandler    KeyEventHandler;
		public event DialogKeyProcessor DoProcessDialogKey;
	}
}