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39 lines
1.3 KiB
39 lines
1.3 KiB
// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt) |
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// This code is distributed under the GNU LGPL (for details please see \doc\license.txt) |
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using System; |
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using System.Windows.Forms; |
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namespace ICSharpCode.SharpDevelop.Widgets |
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{ |
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/// <summary> |
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/// Accumulates mouse wheel deltas and reports the actual number of lines to scroll. |
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/// </summary> |
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public sealed class MouseWheelHandler |
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{ |
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// CODE DUPLICATION: See ICSharpCode.TextEditor.Util.MouseWheelHandler |
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const int WHEEL_DELTA = 120; |
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int mouseWheelDelta; |
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public int GetScrollAmount(MouseEventArgs e) |
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{ |
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// accumulate the delta to support high-resolution mice |
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mouseWheelDelta += e.Delta; |
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Console.WriteLine("Mouse rotation: new delta=" + e.Delta + ", total delta=" + mouseWheelDelta); |
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int linesPerClick = Math.Max(SystemInformation.MouseWheelScrollLines, 1); |
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int scrollDistance = mouseWheelDelta * linesPerClick / WHEEL_DELTA; |
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mouseWheelDelta %= Math.Max(1, WHEEL_DELTA / linesPerClick); |
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return scrollDistance; |
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} |
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public void Scroll(ScrollBar scrollBar, MouseEventArgs e) |
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{ |
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int newvalue = scrollBar.Value - GetScrollAmount(e) * scrollBar.SmallChange; |
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scrollBar.Value = Math.Max(scrollBar.Minimum, Math.Min(scrollBar.Maximum - scrollBar.LargeChange + 1, newvalue)); |
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} |
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} |
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}
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