Browse Source
git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@5203 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61shortcuts
Daniel Grunwald
16 years ago
15 changed files with 23 additions and 188 deletions
@ -1,174 +0,0 @@
@@ -1,174 +0,0 @@
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// <file>
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// <copyright see="prj:///doc/copyright.txt"/>
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// <license see="prj:///doc/license.txt"/>
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// <owner name="Daniel Grunwald"/>
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// <version>$Revision$</version>
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// </file>
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using System; |
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using System.Threading; |
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using System.Windows; |
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using System.Windows.Media; |
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using System.Windows.Media.Imaging; |
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using System.Windows.Threading; |
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namespace ICSharpCode.Core.Presentation |
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{ |
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/// <summary>
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/// A WPF control that aligns its content on pixel boundaries.
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/// </summary>
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public class PixelSnapper : UIElement |
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{ |
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public PixelSnapper() |
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{ |
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} |
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public PixelSnapper(UIElement visualChild) |
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: this() |
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{ |
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this.Child = visualChild; |
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} |
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UIElement _visualChild; |
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/// <summary>
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/// Gets/sets the visual child.
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/// </summary>
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public UIElement Child { |
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get { return _visualChild; } |
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set { |
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RemoveVisualChild(_visualChild); |
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_visualChild = value; |
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AddVisualChild(_visualChild); |
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InvalidateMeasure(); |
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} |
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} |
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/// <summary>
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/// Gets the visual child.
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/// </summary>
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protected override Visual GetVisualChild(int index) |
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{ |
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if (index == 0 && _visualChild != null) |
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return _visualChild; |
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else |
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throw new ArgumentOutOfRangeException("index"); |
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} |
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/// <summary>
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/// Gets the number of visual children.
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/// </summary>
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protected override int VisualChildrenCount { |
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get { return _visualChild != null ? 1 : 0; } |
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} |
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/// <summary>
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/// Measure the visual child.
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/// </summary>
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protected override Size MeasureCore(Size availableSize) |
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{ |
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if (_visualChild != null) { |
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_visualChild.Measure(availableSize); |
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return _visualChild.DesiredSize; |
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} else { |
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return base.MeasureCore(availableSize); |
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} |
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} |
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protected override void ArrangeCore(Rect finalRect) |
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{ |
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base.ArrangeCore(finalRect); |
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if (_visualChild != null) { |
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_pixelOffset = GetPixelOffset(); |
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//LoggingService.Debug("Arrange, Pixel Offset=" + _pixelOffset);
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_visualChild.Arrange(new Rect(new Point(_pixelOffset.X, _pixelOffset.Y), finalRect.Size)); |
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// check again after the whole layout pass has finished, maybe we need to move
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Dispatcher.BeginInvoke(DispatcherPriority.Loaded, new ThreadStart(CheckLayout)); |
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} |
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} |
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private void CheckLayout() |
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{ |
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Point pixelOffset = GetPixelOffset(); |
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if (!AreClose(pixelOffset, _pixelOffset)) { |
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InvalidateArrange(); |
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} |
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} |
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// Gets the matrix that will convert a point from "above" the
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// coordinate space of a visual into the the coordinate space
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// "below" the visual.
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static Matrix GetVisualTransform(Visual v) |
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{ |
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if (v != null) { |
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Matrix m = Matrix.Identity; |
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Transform transform = VisualTreeHelper.GetTransform(v); |
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if (transform != null) { |
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m *= transform.Value; |
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} |
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Vector offset = VisualTreeHelper.GetOffset(v); |
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m.Translate(offset.X, offset.Y); |
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return m; |
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} |
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return Matrix.Identity; |
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} |
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static Point ApplyVisualTransform(Point point, Visual v, bool inverse) |
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{ |
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if (v != null) { |
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Matrix visualTransform = GetVisualTransform(v); |
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if (inverse) |
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visualTransform.Invert(); |
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point = visualTransform.Transform(point); |
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} |
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return point; |
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} |
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private Point GetPixelOffset() |
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{ |
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Point pixelOffset = new Point(); |
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PresentationSource ps = PresentationSource.FromVisual(this); |
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if (ps != null) { |
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Visual rootVisual = ps.RootVisual; |
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// Transform (0,0) from this element up to pixels.
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pixelOffset = this.TransformToAncestor(rootVisual).Transform(pixelOffset); |
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pixelOffset = ApplyVisualTransform(pixelOffset, rootVisual, false); |
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pixelOffset = ps.CompositionTarget.TransformToDevice.Transform(pixelOffset); |
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// Round the origin to the nearest whole pixel.
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pixelOffset.X = Math.Round(pixelOffset.X); |
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pixelOffset.Y = Math.Round(pixelOffset.Y); |
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// Transform the whole-pixel back to this element.
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pixelOffset = ps.CompositionTarget.TransformFromDevice.Transform(pixelOffset); |
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pixelOffset = ApplyVisualTransform(pixelOffset, rootVisual, true); |
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pixelOffset = rootVisual.TransformToDescendant(this).Transform(pixelOffset); |
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} |
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return pixelOffset; |
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} |
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static bool AreClose(Point point1, Point point2) |
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{ |
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return AreClose(point1.X, point2.X) && AreClose(point1.Y, point2.Y); |
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} |
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static bool AreClose(double value1, double value2) |
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{ |
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if (value1 == value2) |
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{ |
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return true; |
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} |
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double delta = value1 - value2; |
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return ((delta < 1.53E-06) && (delta > -1.53E-06)); |
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} |
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private Point _pixelOffset; |
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} |
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} |
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