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242
WPFDark/Controls/BiaClippingBorder.xaml.cs
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242
WPFDark/Controls/BiaClippingBorder.xaml.cs
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using System.Collections.Generic;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Media;
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using WPFDark.Internals;
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namespace WPFDark.Controls
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{
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// https://stackoverflow.com/questions/324641/how-to-make-the-contents-of-a-round-cornered-border-be-also-round-cornered
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public class BiaClippingBorder : Border
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{
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protected override void OnRender(DrawingContext dc)
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{
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OnApplyChildClip();
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base.OnRender(dc);
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}
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public override UIElement Child
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{
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get => base.Child;
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set
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{
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if (Child == value)
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return;
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Child?.SetValue(ClipProperty, _oldClip);
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_oldClip = value?.ReadLocalValue(ClipProperty);
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base.Child = value;
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}
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}
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static BiaClippingBorder()
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{
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DefaultStyleKeyProperty.OverrideMetadata(typeof(BiaClippingBorder),
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new FrameworkPropertyMetadata(typeof(BiaClippingBorder)));
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}
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protected virtual void OnApplyChildClip()
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{
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var child = Child;
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if (child is null)
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return;
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var key = HashCodeMaker.Make(
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Child.RenderSize.Width, Child.RenderSize.Height,
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CornerRadius.BottomLeft, CornerRadius.BottomRight,
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CornerRadius.TopLeft, CornerRadius.TopRight);
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if (_clipRectCache.TryGetValue(key, out var clipRect) == false)
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{
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var isSame =
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NumberHelper.AreClose(CornerRadius.TopLeft, CornerRadius.TopRight) &&
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NumberHelper.AreClose(CornerRadius.TopRight, CornerRadius.BottomRight) &&
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NumberHelper.AreClose(CornerRadius.BottomRight, CornerRadius.BottomLeft) &&
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NumberHelper.AreClose(CornerRadius.BottomLeft, CornerRadius.TopLeft);
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clipRect = isSame
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? MakeRoundRectangleGeometrySameCorner(new Rect(Child.RenderSize), CornerRadius, BorderThickness)
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: MakeRoundRectangleGeometry(new Rect(Child.RenderSize), CornerRadius, BorderThickness);
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_clipRectCache.Add(key, clipRect);
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}
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child.Clip = clipRect;
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}
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private object? _oldClip;
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private static readonly Dictionary<long, Geometry> _clipRectCache = new Dictionary<long, Geometry>();
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private static Geometry MakeRoundRectangleGeometrySameCorner(Rect baseRect, CornerRadius cornerRadius,
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Thickness borderThickness)
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{
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var radius = (0.0, cornerRadius.TopLeft - borderThickness.Left * 0.5).Max();
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var clipRect = new RectangleGeometry
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{
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RadiusX = radius,
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RadiusY = radius,
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Rect = baseRect
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};
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clipRect.Freeze();
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return clipRect;
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}
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// https://wpfspark.wordpress.com/2011/06/08/clipborder-a-wpf-border-that-clips/
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private static Geometry MakeRoundRectangleGeometry(Rect baseRect, CornerRadius cornerRadius, Thickness borderThickness)
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{
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if (cornerRadius.TopLeft < double.Epsilon)
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cornerRadius.TopLeft = 0.0;
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if (cornerRadius.TopRight < double.Epsilon)
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cornerRadius.TopRight = 0.0;
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if (cornerRadius.BottomLeft < double.Epsilon)
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cornerRadius.BottomLeft = 0.0;
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if (cornerRadius.BottomRight < double.Epsilon)
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cornerRadius.BottomRight = 0.0;
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var leftHalf = borderThickness.Left * 0.5;
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if (leftHalf < double.Epsilon)
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leftHalf = 0.0;
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var topHalf = borderThickness.Top * 0.5;
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if (topHalf < double.Epsilon)
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topHalf = 0.0;
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var rightHalf = borderThickness.Right * 0.5;
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if (rightHalf < double.Epsilon)
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rightHalf = 0.0;
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var bottomHalf = borderThickness.Bottom * 0.5;
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if (bottomHalf < double.Epsilon)
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bottomHalf = 0.0;
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var topLeftRect = new Rect(
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baseRect.Location.X,
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baseRect.Location.Y,
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(0.0, cornerRadius.TopLeft - leftHalf).Max(),
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(0.0, cornerRadius.TopLeft - rightHalf).Max());
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var topRightRect = new Rect(
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baseRect.Location.X + baseRect.Width - cornerRadius.TopRight + rightHalf,
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baseRect.Location.Y,
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(0.0, cornerRadius.TopRight - rightHalf).Max(),
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(0.0, cornerRadius.TopRight - topHalf).Max());
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var bottomRightRect = new Rect(
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baseRect.Location.X + baseRect.Width - cornerRadius.BottomRight + rightHalf,
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baseRect.Location.Y + baseRect.Height - cornerRadius.BottomRight + bottomHalf,
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(0.0, cornerRadius.BottomRight - rightHalf).Max(),
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(0.0, cornerRadius.BottomRight - bottomHalf).Max());
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var bottomLeftRect = new Rect(
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baseRect.Location.X,
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baseRect.Location.Y + baseRect.Height - cornerRadius.BottomLeft + bottomHalf,
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(0.0, cornerRadius.BottomLeft - leftHalf).Max(),
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(0.0, cornerRadius.BottomLeft - bottomHalf).Max());
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if (topLeftRect.Right > topRightRect.Left)
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{
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var newWidth = topLeftRect.Width / (topLeftRect.Width + topRightRect.Width) * baseRect.Width;
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topLeftRect = new Rect(
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topLeftRect.Location.X,
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topLeftRect.Location.Y,
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newWidth,
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topLeftRect.Height);
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topRightRect = new Rect(
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baseRect.Left + newWidth,
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topRightRect.Location.Y,
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(0.0, baseRect.Width - newWidth).Max(),
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topRightRect.Height);
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}
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if (topRightRect.Bottom > bottomRightRect.Top)
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{
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var newHeight = topRightRect.Height / (topRightRect.Height + bottomRightRect.Height) * baseRect.Height;
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topRightRect = new Rect(
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topRightRect.Location.X,
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topRightRect.Location.Y,
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topRightRect.Width,
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newHeight);
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bottomRightRect = new Rect(
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bottomRightRect.Location.X,
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baseRect.Top + newHeight,
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bottomRightRect.Width,
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(0.0, baseRect.Height - newHeight).Max());
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}
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if (bottomRightRect.Left < bottomLeftRect.Right)
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{
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var newWidth = bottomLeftRect.Width / (bottomLeftRect.Width + bottomRightRect.Width) * baseRect.Width;
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bottomLeftRect = new Rect(
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bottomLeftRect.Location.X,
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bottomLeftRect.Location.Y,
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newWidth,
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bottomLeftRect.Height);
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bottomRightRect = new Rect(
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baseRect.Left + newWidth,
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bottomRightRect.Location.Y,
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(0.0, baseRect.Width - newWidth).Max(),
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bottomRightRect.Height);
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}
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if (bottomLeftRect.Top < topLeftRect.Bottom)
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{
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var newHeight = topLeftRect.Height / (topLeftRect.Height + bottomLeftRect.Height) * baseRect.Height;
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topLeftRect = new Rect(
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topLeftRect.Location.X,
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topLeftRect.Location.Y,
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topLeftRect.Width,
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newHeight);
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bottomLeftRect = new Rect(
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bottomLeftRect.Location.X,
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baseRect.Top + newHeight,
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bottomLeftRect.Width,
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(0.0, baseRect.Height - newHeight).Max());
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}
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var clipRect = new StreamGeometry();
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using (var context = clipRect.Open())
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{
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context.BeginFigure(topLeftRect.BottomLeft, true, true);
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context.ArcTo(topLeftRect.TopRight, topLeftRect.Size, 0, false, SweepDirection.Clockwise,
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true, true);
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context.LineTo(topRightRect.TopLeft, true, true);
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context.ArcTo(topRightRect.BottomRight, topRightRect.Size, 0, false, SweepDirection.Clockwise,
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true, true);
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context.LineTo(bottomRightRect.TopRight, true, true);
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context.ArcTo(bottomRightRect.BottomLeft, bottomRightRect.Size, 0, false, SweepDirection.Clockwise,
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true, true);
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context.LineTo(bottomLeftRect.BottomRight, true, true);
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context.ArcTo(bottomLeftRect.TopLeft, bottomLeftRect.Size, 0, false, SweepDirection.Clockwise,
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true, true);
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}
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clipRect.Freeze();
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return clipRect;
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}
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}
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}
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