Nikita Tsukanov
1 day ago
committed by
GitHub
GitHub
12 changed files with 290 additions and 128 deletions
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using System; |
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using System.Collections.Generic; |
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using Avalonia.Media; |
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using Avalonia.VisualTree; |
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namespace Avalonia.Controls.Primitives; |
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class AdornerHelper |
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{ |
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public static IDisposable SubscribeToAncestorPropertyChanges(Visual visual, |
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bool includeClip, Action changed) |
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{ |
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return new AncestorPropertyChangesSubscription(visual, includeClip, changed); |
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} |
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private class AncestorPropertyChangesSubscription : IDisposable |
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{ |
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private readonly Visual _visual; |
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private readonly bool _includeClip; |
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private readonly Action _changed; |
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private readonly EventHandler<AvaloniaPropertyChangedEventArgs> _propertyChangedHandler; |
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private readonly List<Visual> _subscriptions = new List<Visual>(); |
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private bool _isDisposed; |
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public AncestorPropertyChangesSubscription(Visual visual, bool includeClip, Action changed) |
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{ |
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_visual = visual; |
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_includeClip = includeClip; |
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_changed = changed; |
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_propertyChangedHandler = OnPropertyChanged; |
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_visual.AttachedToVisualTree += OnAttachedToVisualTree; |
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_visual.DetachedFromVisualTree += OnDetachedFromVisualTree; |
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if (_visual.IsAttachedToVisualTree) |
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{ |
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SubscribeToAncestors(); |
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} |
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} |
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private void SubscribeToAncestors() |
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{ |
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UnsubscribeFromAncestors(); |
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// Subscribe to the visual's own Bounds property
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_visual.PropertyChanged += _propertyChangedHandler; |
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_subscriptions.Add(_visual); |
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// Walk up the ancestor chain
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var ancestor = _visual.VisualParent; |
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while (ancestor != null) |
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{ |
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if (ancestor is Visual visualAncestor) |
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{ |
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visualAncestor.PropertyChanged += _propertyChangedHandler; |
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_subscriptions.Add(visualAncestor); |
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} |
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ancestor = ancestor.VisualParent; |
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} |
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} |
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private void UnsubscribeFromAncestors() |
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{ |
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foreach (var subscription in _subscriptions) |
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{ |
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subscription.PropertyChanged -= _propertyChangedHandler; |
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} |
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_subscriptions.Clear(); |
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} |
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private void OnPropertyChanged(object? sender, AvaloniaPropertyChangedEventArgs e) |
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{ |
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if (!e.IsEffectiveValueChange) |
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return; |
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bool shouldNotify = false; |
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if (e.Property == Visual.RenderTransformProperty || e.Property == Visual.BoundsProperty) |
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{ |
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shouldNotify = true; |
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} |
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else if (_includeClip) |
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{ |
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if (e.Property == Visual.ClipToBoundsProperty || |
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e.Property == Visual.ClipProperty) shouldNotify = true; |
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} |
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if (shouldNotify) |
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{ |
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_changed(); |
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} |
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} |
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private void OnAttachedToVisualTree(object? sender, VisualTreeAttachmentEventArgs e) |
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{ |
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SubscribeToAncestors(); |
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_changed(); |
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} |
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private void OnDetachedFromVisualTree(object? sender, VisualTreeAttachmentEventArgs e) |
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{ |
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UnsubscribeFromAncestors(); |
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_changed(); |
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} |
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public void Dispose() |
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{ |
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if (_isDisposed) |
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return; |
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_isDisposed = true; |
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UnsubscribeFromAncestors(); |
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_visual.AttachedToVisualTree -= OnAttachedToVisualTree; |
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_visual.DetachedFromVisualTree -= OnDetachedFromVisualTree; |
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} |
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} |
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public static Geometry? CalculateAdornerClip(Visual adornedElement) |
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{ |
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// Walk ancestor stack and calculate clip geometry relative to the current visual.
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// If ClipToBounds = true, add extra RectangleGeometry for Bounds.Size
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Geometry? result = null; |
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var ancestor = adornedElement.VisualParent; |
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while (ancestor != null) |
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{ |
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if (ancestor is Visual visualAncestor) |
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{ |
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Geometry? ancestorClip = null; |
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// Check if ancestor has ClipToBounds enabled
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if (visualAncestor.ClipToBounds) |
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{ |
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ancestorClip = new RectangleGeometry(new Rect(visualAncestor.Bounds.Size)); |
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} |
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// Check if ancestor has explicit Clip geometry
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if (visualAncestor.Clip != null) |
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{ |
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if (ancestorClip != null) |
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{ |
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ancestorClip = new CombinedGeometry(GeometryCombineMode.Intersect, ancestorClip, visualAncestor.Clip); |
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} |
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else |
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{ |
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ancestorClip = visualAncestor.Clip; |
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} |
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} |
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// Transform the clip geometry to adorned element's coordinate space
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if (ancestorClip != null) |
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{ |
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var transform = visualAncestor.TransformToVisual(adornedElement); |
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if (transform.HasValue && !transform.Value.IsIdentity) |
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{ |
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ancestorClip = ancestorClip.Clone(); |
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ancestorClip.Transform = new MatrixTransform(transform.Value); |
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} |
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// Combine with existing result
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if (result != null) |
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{ |
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result = new CombinedGeometry(GeometryCombineMode.Intersect, result, ancestorClip); |
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} |
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else |
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{ |
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result = ancestorClip; |
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} |
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} |
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} |
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ancestor = ancestor.VisualParent; |
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} |
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return result; |
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} |
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} |
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