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ICSharpCode.TextEditor/Project/Src/Util/MouseWheelHandler.cs

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+// <file>
+//     <copyright see="prj:///doc/copyright.txt"/>
+//     <license see="prj:///doc/license.txt"/>
+//     <author name="Daniel Grunwald"/>
+//     <version>$Revision$</version>
+// </file>
+
+using System;
+using System.Windows.Forms;
+
+namespace ICSharpCode.TextEditor.Util
+{
+	/// <summary>
+	/// Accumulates mouse wheel deltas and reports the actual number of lines to scroll.
+	/// </summary>
+	class MouseWheelHandler
+	{
+		// CODE DUPLICATION: See ICSharpCode.SharpDevelop.Widgets.MouseWheelHandler
+		
+		const int WHEEL_DELTA = 120;
+		
+		int mouseWheelDelta;
+		
+		public int GetScrollAmount(MouseEventArgs e)
+		{
+			// accumulate the delta to support high-resolution mice
+			mouseWheelDelta += e.Delta;
+			
+			int linesPerClick = Math.Max(SystemInformation.MouseWheelScrollLines, 1);
+			
+			int scrollDistance = mouseWheelDelta * linesPerClick / WHEEL_DELTA;
+			mouseWheelDelta %= Math.Max(1, WHEEL_DELTA / linesPerClick);
+			return scrollDistance;
+		}
+	}
+}