327 строки
9.5 KiB
C#
327 строки
9.5 KiB
C#
using System;
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using System.ComponentModel;
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using System.Drawing;
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using System.Threading;
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using CoreAnimation;
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using Xamarin.Forms.Internals;
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#if __MOBILE__
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namespace Xamarin.Forms.Platform.iOS
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#else
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namespace Xamarin.Forms.Platform.MacOS
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#endif
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{
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public class VisualElementTracker : IDisposable
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{
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readonly EventHandler<EventArg<VisualElement>> _batchCommittedHandler;
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readonly PropertyChangedEventHandler _propertyChangedHandler;
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readonly EventHandler _sizeChangedEventHandler;
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bool _disposed;
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VisualElement _element;
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// Track these by hand because the calls down into iOS are too expensive
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bool _isInteractive;
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Rectangle _lastBounds;
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#if !__MOBILE__
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Rectangle _lastParentBounds;
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#endif
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CALayer _layer;
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int _updateCount;
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public VisualElementTracker(IVisualElementRenderer renderer)
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{
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if (renderer == null)
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throw new ArgumentNullException("renderer");
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_propertyChangedHandler = HandlePropertyChanged;
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_sizeChangedEventHandler = HandleSizeChanged;
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_batchCommittedHandler = HandleRedrawNeeded;
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Renderer = renderer;
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renderer.ElementChanged += OnRendererElementChanged;
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SetElement(null, renderer.Element);
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}
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IVisualElementRenderer Renderer { get; set; }
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public void Dispose()
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{
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Dispose(true);
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}
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public event EventHandler NativeControlUpdated;
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protected virtual void Dispose(bool disposing)
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{
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if (_disposed)
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return;
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_disposed = true;
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if (disposing)
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{
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SetElement(_element, null);
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if (_layer != null)
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{
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_layer.Dispose();
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_layer = null;
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}
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Renderer.ElementChanged -= OnRendererElementChanged;
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Renderer = null;
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}
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}
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void HandlePropertyChanged(object sender, PropertyChangedEventArgs e)
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{
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if (e.PropertyName == VisualElement.XProperty.PropertyName || e.PropertyName == VisualElement.YProperty.PropertyName || e.PropertyName == VisualElement.WidthProperty.PropertyName ||
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e.PropertyName == VisualElement.HeightProperty.PropertyName || e.PropertyName == VisualElement.AnchorXProperty.PropertyName || e.PropertyName == VisualElement.AnchorYProperty.PropertyName ||
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e.PropertyName == VisualElement.TranslationXProperty.PropertyName || e.PropertyName == VisualElement.TranslationYProperty.PropertyName || e.PropertyName == VisualElement.ScaleProperty.PropertyName || e.PropertyName == VisualElement.ScaleXProperty.PropertyName || e.PropertyName == VisualElement.ScaleYProperty.PropertyName ||
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e.PropertyName == VisualElement.RotationProperty.PropertyName || e.PropertyName == VisualElement.RotationXProperty.PropertyName || e.PropertyName == VisualElement.RotationYProperty.PropertyName ||
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e.PropertyName == VisualElement.IsVisibleProperty.PropertyName || e.PropertyName == VisualElement.IsEnabledProperty.PropertyName ||
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e.PropertyName == VisualElement.InputTransparentProperty.PropertyName || e.PropertyName == VisualElement.OpacityProperty.PropertyName ||
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e.PropertyName == Layout.CascadeInputTransparentProperty.PropertyName)
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UpdateNativeControl(); // poorly optimized
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}
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void HandleRedrawNeeded(object sender, EventArgs e)
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{
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UpdateNativeControl();
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}
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void HandleSizeChanged(object sender, EventArgs e)
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{
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UpdateNativeControl();
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}
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void OnRendererElementChanged(object s, VisualElementChangedEventArgs e)
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{
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if (_element == e.NewElement)
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return;
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SetElement(_element, e.NewElement);
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}
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void OnUpdateNativeControl(CALayer caLayer)
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{
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var view = Renderer.Element;
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var uiview = Renderer.NativeView;
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if (view == null || view.Batched)
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return;
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bool shouldInteract;
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if (view is Layout layout)
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{
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if (layout.InputTransparent)
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{
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shouldInteract = !layout.CascadeInputTransparent;
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}
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else
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{
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shouldInteract = layout.IsEnabled;
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}
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}
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else
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{
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shouldInteract = !view.InputTransparent && view.IsEnabled;
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}
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if (_isInteractive != shouldInteract)
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{
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#if __MOBILE__
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uiview.UserInteractionEnabled = shouldInteract;
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#endif
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_isInteractive = shouldInteract;
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}
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var boundsChanged = _lastBounds != view.Bounds;
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#if !__MOBILE__
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var viewParent = view.RealParent as VisualElement;
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var parentBoundsChanged = _lastParentBounds != (viewParent == null ? Rectangle.Zero : viewParent.Bounds);
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#endif
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var thread = !boundsChanged && !caLayer.Frame.IsEmpty;
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var anchorX = (float)view.AnchorX;
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var anchorY = (float)view.AnchorY;
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var translationX = (float)view.TranslationX;
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var translationY = (float)view.TranslationY;
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var rotationX = (float)view.RotationX;
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var rotationY = (float)view.RotationY;
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var rotation = (float)view.Rotation;
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var scale = (float)view.Scale;
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var scaleX = (float)view.ScaleX * scale;
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var scaleY = (float)view.ScaleY * scale;
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var width = (float)view.Width;
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var height = (float)view.Height;
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var x = (float)view.X + (float)CompressedLayout.GetHeadlessOffset(view).X;
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var y = (float)view.Y + (float)CompressedLayout.GetHeadlessOffset(view).Y;
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var opacity = (float)view.Opacity;
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var isVisible = view.IsVisible;
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var updateTarget = Interlocked.Increment(ref _updateCount);
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Action update = () =>
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{
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if (updateTarget != _updateCount)
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return;
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#if __MOBILE__
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var visualElement = view;
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#endif
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var parent = view.RealParent;
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var shouldRelayoutSublayers = false;
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if (isVisible && caLayer.Hidden)
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{
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#if !__MOBILE__
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uiview.Hidden = false;
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#endif
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caLayer.Hidden = false;
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if (!caLayer.Frame.IsEmpty)
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shouldRelayoutSublayers = true;
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}
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if (!isVisible && !caLayer.Hidden)
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{
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#if !__MOBILE__
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uiview.Hidden = true;
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#endif
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caLayer.Hidden = true;
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shouldRelayoutSublayers = true;
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}
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// ripe for optimization
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var transform = CATransform3D.Identity;
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#if __MOBILE__
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bool shouldUpdate = (!(visualElement is Page) || visualElement is ContentPage) && width > 0 && height > 0 && parent != null && boundsChanged;
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#else
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// We don't care if it's a page or not since bounds of the window can change
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// TODO: Find why it doesn't work to check if the parentsBounds changed and remove true;
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parentBoundsChanged = true;
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bool shouldUpdate = width > 0 && height > 0 && parent != null && (boundsChanged || parentBoundsChanged);
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#endif
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// Dont ever attempt to actually change the layout of a Page unless it is a ContentPage
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// iOS is a really big fan of you not actually modifying the View's of the UIViewControllers
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if (shouldUpdate)
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{
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#if __MOBILE__
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var target = new RectangleF(x, y, width, height);
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#else
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var visualParent = parent as VisualElement;
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float newY = visualParent == null ? y : Math.Max(0, (float)(visualParent.Height - y - view.Height));
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var target = new RectangleF(x, newY, width, height);
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#endif
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// must reset transform prior to setting frame...
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caLayer.Transform = transform;
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uiview.Frame = target;
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if (shouldRelayoutSublayers)
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caLayer.LayoutSublayers();
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}
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else if (width <= 0 || height <= 0)
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{
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//TODO: FInd why it doesn't work
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#if __MOBILE__
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caLayer.Hidden = true;
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#endif
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return;
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}
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#if __MOBILE__
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caLayer.AnchorPoint = new PointF(anchorX, anchorY);
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#else
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caLayer.AnchorPoint = new PointF(anchorX - 0.5f, anchorY - 0.5f);
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#endif
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caLayer.Opacity = opacity;
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const double epsilon = 0.001;
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// position is relative to anchor point
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if (Math.Abs(anchorX - .5) > epsilon)
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transform = transform.Translate((anchorX - .5f) * width, 0, 0);
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if (Math.Abs(anchorY - .5) > epsilon)
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transform = transform.Translate(0, (anchorY - .5f) * height, 0);
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if (Math.Abs(translationX) > epsilon || Math.Abs(translationY) > epsilon)
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transform = transform.Translate(translationX, translationY, 0);
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if (Math.Abs(scaleX - 1) > epsilon || Math.Abs(scaleY - 1) > epsilon)
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transform = transform.Scale(scaleX, scaleY, scale);
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// not just an optimization, iOS will not "pixel align" a view which has m34 set
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if (Math.Abs(rotationY % 180) > epsilon || Math.Abs(rotationX % 180) > epsilon)
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transform.m34 = 1.0f / -400f;
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if (Math.Abs(rotationX % 360) > epsilon)
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transform = transform.Rotate(rotationX * (float)Math.PI / 180.0f, 1.0f, 0.0f, 0.0f);
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if (Math.Abs(rotationY % 360) > epsilon)
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transform = transform.Rotate(rotationY * (float)Math.PI / 180.0f, 0.0f, 1.0f, 0.0f);
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transform = transform.Rotate(rotation * (float)Math.PI / 180.0f, 0.0f, 0.0f, 1.0f);
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caLayer.Transform = transform;
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};
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#if __MOBILE__
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if (thread)
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CADisplayLinkTicker.Default.Invoke(update);
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else
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update();
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#else
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update();
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#endif
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_lastBounds = view.Bounds;
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#if !__MOBILE__
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_lastParentBounds = viewParent?.Bounds ?? Rectangle.Zero;
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#endif
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}
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void SetElement(VisualElement oldElement, VisualElement newElement)
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{
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if (oldElement != null)
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{
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oldElement.PropertyChanged -= _propertyChangedHandler;
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oldElement.SizeChanged -= _sizeChangedEventHandler;
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oldElement.BatchCommitted -= _batchCommittedHandler;
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}
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_element = newElement;
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if (newElement != null)
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{
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newElement.BatchCommitted += _batchCommittedHandler;
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newElement.SizeChanged += _sizeChangedEventHandler;
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newElement.PropertyChanged += _propertyChangedHandler;
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UpdateNativeControl();
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}
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}
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void UpdateNativeControl()
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{
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Performance.Start(out string reference);
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if (_disposed)
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return;
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if (_layer == null)
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{
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#if !__MOBILE__
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Renderer.NativeView.WantsLayer = true;
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#endif
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_layer = Renderer.NativeView.Layer;
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#if __MOBILE__
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_isInteractive = Renderer.NativeView.UserInteractionEnabled;
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#endif
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}
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OnUpdateNativeControl(_layer);
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NativeControlUpdated?.Invoke(this, EventArgs.Empty);
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Performance.Stop(reference);
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}
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}
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} |