first commit

ICSharpCode.TextEditor/Project/Src/Gui/GutterMargin.cs

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+// <file>
+//     <copyright see="prj:///doc/copyright.txt"/>
+//     <license see="prj:///doc/license.txt"/>
+//     <owner name="Mike Krüger" email="mike@icsharpcode.net"/>
+//     <version>$Revision$</version>
+// </file>
+
+using System;
+using System.Drawing;
+using System.IO;
+using System.Reflection;
+using System.Windows.Forms;
+
+using ICSharpCode.TextEditor.Document;
+
+namespace ICSharpCode.TextEditor
+{
+	/// <summary>
+	/// This class views the line numbers and folding markers.
+	/// </summary>
+	public class GutterMargin : AbstractMargin, IDisposable
+	{
+		StringFormat numberStringFormat = (StringFormat)StringFormat.GenericTypographic.Clone();
+		
+		public static Cursor RightLeftCursor;
+
+        static GutterMargin()
+        {
+            using (var ms = new MemoryStream(Properties.Resources.RightArrow))
+            {
+                RightLeftCursor = new Cursor(ms);
+            }
+        }
+
+        public void Dispose()
+		{
+			numberStringFormat.Dispose();
+		}
+		
+		public override Cursor Cursor {
+			get {
+				return RightLeftCursor;
+			}
+		}
+		
+		public override Size Size {
+			get {
+				return new Size((int)(textArea.TextView.WideSpaceWidth
+				                      * Math.Max(3, (int)Math.Log10(textArea.Document.TotalNumberOfLines) + 1)),
+				                -1);
+			}
+		}
+		
+		public override bool IsVisible {
+			get {
+				return textArea.TextEditorProperties.ShowLineNumbers;
+			}
+		}
+		
+		public GutterMargin(TextArea textArea) : base(textArea)
+		{
+			numberStringFormat.LineAlignment = StringAlignment.Far;
+			numberStringFormat.FormatFlags   = StringFormatFlags.MeasureTrailingSpaces | StringFormatFlags.FitBlackBox |
+				StringFormatFlags.NoWrap | StringFormatFlags.NoClip;
+		}
+		
+		public override void Paint(Graphics g, Rectangle rect)
+		{
+			if (rect.Width <= 0 || rect.Height <= 0) {
+				return;
+			}
+			HighlightColor lineNumberPainterColor = textArea.Document.HighlightingStrategy.GetColorFor("LineNumbers");
+			int fontHeight = textArea.TextView.FontHeight;
+			Brush fillBrush = textArea.Enabled ? BrushRegistry.GetBrush(lineNumberPainterColor.BackgroundColor) : SystemBrushes.InactiveBorder;
+			Brush drawBrush = BrushRegistry.GetBrush(lineNumberPainterColor.Color);
+			for (int y = 0; y < (DrawingPosition.Height + textArea.TextView.VisibleLineDrawingRemainder) / fontHeight + 1; ++y) {
+				int ypos = drawingPosition.Y + fontHeight * y  - textArea.TextView.VisibleLineDrawingRemainder;
+				Rectangle backgroundRectangle = new Rectangle(drawingPosition.X, ypos, drawingPosition.Width, fontHeight);
+				if (rect.IntersectsWith(backgroundRectangle)) {
+					g.FillRectangle(fillBrush, backgroundRectangle);
+					int curLine = textArea.Document.GetFirstLogicalLine(textArea.Document.GetVisibleLine(textArea.TextView.FirstVisibleLine) + y);
+					
+					if (curLine < textArea.Document.TotalNumberOfLines) {
+						g.DrawString((curLine + 1).ToString(),
+						             lineNumberPainterColor.GetFont(TextEditorProperties.FontContainer),
+						             drawBrush,
+						             backgroundRectangle,
+						             numberStringFormat);
+					}
+				}
+			}
+		}
+
+		public override void HandleMouseDown(Point mousepos, MouseButtons mouseButtons)
+		{
+			TextLocation selectionStartPos;
+
+			textArea.SelectionManager.selectFrom.where = WhereFrom.Gutter;
+			int realline = textArea.TextView.GetLogicalLine(mousepos.Y);
+			if (realline >= 0 && realline < textArea.Document.TotalNumberOfLines) {
+				// shift-select
+				if((Control.ModifierKeys & Keys.Shift) != 0) {
+					if(!textArea.SelectionManager.HasSomethingSelected && realline != textArea.Caret.Position.Y) {
+						if (realline >= textArea.Caret.Position.Y)
+						{ // at or below starting selection, place the cursor on the next line
+							// nothing is selected so make a new selection from cursor
+							selectionStartPos = textArea.Caret.Position;
+							// whole line selection - start of line to start of next line
+							if (realline < textArea.Document.TotalNumberOfLines - 1)
+							{
+								textArea.SelectionManager.SetSelection(new DefaultSelection(textArea.Document, selectionStartPos, new TextLocation(0, realline + 1)));
+								textArea.Caret.Position = new TextLocation(0, realline + 1);
+							}
+							else
+							{
+								textArea.SelectionManager.SetSelection(new DefaultSelection(textArea.Document, selectionStartPos, new TextLocation(textArea.Document.GetLineSegment(realline).Length + 1, realline)));
+								textArea.Caret.Position = new TextLocation(textArea.Document.GetLineSegment(realline).Length + 1, realline);
+							}
+						}
+						else
+						{ // prior lines to starting selection, place the cursor on the same line as the new selection
+							// nothing is selected so make a new selection from cursor
+							selectionStartPos = textArea.Caret.Position;
+							// whole line selection - start of line to start of next line
+							textArea.SelectionManager.SetSelection(new DefaultSelection(textArea.Document, selectionStartPos, new TextLocation(selectionStartPos.X, selectionStartPos.Y)));
+							textArea.SelectionManager.ExtendSelection(new TextLocation(selectionStartPos.X, selectionStartPos.Y), new TextLocation(0, realline));
+							textArea.Caret.Position = new TextLocation(0, realline);
+						}
+					}
+					else
+					{
+						// let MouseMove handle a shift-click in a gutter
+						MouseEventArgs e = new MouseEventArgs(mouseButtons, 1, mousepos.X, mousepos.Y, 0);
+						textArea.RaiseMouseMove(e);
+					}
+				} else { // this is a new selection with no shift-key
+					// sync the textareamousehandler mouse location
+					// (fixes problem with clicking out into a menu then back to the gutter whilst
+					// there is a selection)
+					textArea.mousepos = mousepos;
+
+					selectionStartPos = new TextLocation(0, realline);
+					textArea.SelectionManager.ClearSelection();
+					// whole line selection - start of line to start of next line
+					if (realline < textArea.Document.TotalNumberOfLines - 1)
+					{
+						textArea.SelectionManager.SetSelection(new DefaultSelection(textArea.Document, selectionStartPos, new TextLocation(selectionStartPos.X, selectionStartPos.Y + 1)));
+						textArea.Caret.Position = new TextLocation(selectionStartPos.X, selectionStartPos.Y + 1);
+					}
+					else
+					{
+						textArea.SelectionManager.SetSelection(new DefaultSelection(textArea.Document, new TextLocation(0, realline), new TextLocation(textArea.Document.GetLineSegment(realline).Length + 1, selectionStartPos.Y)));
+						textArea.Caret.Position = new TextLocation(textArea.Document.GetLineSegment(realline).Length + 1, selectionStartPos.Y);
+					}
+				}
+			}
+		}
+	}
+}