TheXamlGuy
98 lines
3.2 KiB
C#
98 lines
3.2 KiB
C#
using Avalonia;
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using Avalonia.Controls;
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using Avalonia.Controls.Primitives;
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using Avalonia.Media;
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using Path = Avalonia.Controls.Shapes.Path;
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namespace Toolkit.UI.Controls.Avalonia;
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public class ContentBadge :
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ContentControl
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{
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public static readonly StyledProperty<string?> BadgePathProperty =
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AvaloniaProperty.Register<ContentBadge, string?>(nameof(BadgePath));
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public static readonly StyledProperty<double> BadgeSizeProperty =
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AvaloniaProperty.Register<ContentBadge, double>(nameof(BadgeSize), 14);
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private ContentControl? badgeContent;
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public string? BadgePath
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{
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get => GetValue(BadgePathProperty);
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set => SetValue(BadgePathProperty, value);
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}
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public double BadgeSize
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{
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get => GetValue(BadgeSizeProperty);
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set => SetValue(BadgeSizeProperty, value);
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}
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public void UpdateClip()
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{
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if (Content is Control content &&
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badgeContent is not null &&
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BadgePath is { Length: > 0 } &&
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Geometry.Parse(BadgePath) is Geometry geometry)
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{
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double backgroundWidth = DesiredSize.Width;
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double backgroundHeight = DesiredSize.Height;
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double scaleX = BadgeSize / geometry.Bounds.Width;
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double scaleY = BadgeSize / geometry.Bounds.Height;
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double adjustedStrokeWidth = Math.Min(scaleX, scaleY) * 8;
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Geometry knockoutGeometry = geometry.GetWidenedGeometry(new Pen(new SolidColorBrush(Colors.Transparent), adjustedStrokeWidth);
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TransformGroup transformGroup = new();
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transformGroup.Children.Add(new ScaleTransform(scaleX, scaleY));
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double scaledWidth = knockoutGeometry.Bounds.Width * scaleX;
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double scaledHeight = knockoutGeometry.Bounds.Height * scaleY;
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double offsetX = backgroundWidth - scaledWidth;
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double offsetY = backgroundHeight - scaledHeight;
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transformGroup.Children.Add(new TranslateTransform(offsetX, offsetY));
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knockoutGeometry.Transform = transformGroup;
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CombinedGeometry combinedGeometry = new()
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{
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GeometryCombineMode = GeometryCombineMode.Exclude,
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Geometry1 = new RectangleGeometry { Rect = new Rect(0, 0, backgroundWidth, backgroundHeight) },
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Geometry2 = knockoutGeometry
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};
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content.Clip = combinedGeometry;
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Geometry overlayGeometry = geometry.Clone();
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TransformGroup overlayTransformGroup = new();
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overlayTransformGroup.Children.Add(new ScaleTransform(scaleX, scaleY));
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overlayTransformGroup.Children.Add(new TranslateTransform(offsetX, offsetY));
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overlayGeometry.Transform = overlayTransformGroup;
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badgeContent.Content = new Path
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{
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Data = overlayGeometry,
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Fill = Foreground
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};
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}
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}
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protected override void OnApplyTemplate(TemplateAppliedEventArgs args)
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{
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base.OnApplyTemplate(args);
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badgeContent = args.NameScope.Get<ContentControl>("BadgeContent");
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}
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protected override void OnSizeChanged(SizeChangedEventArgs args)
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{
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base.OnSizeChanged(args);
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UpdateClip();
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}
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}
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