Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / Animation / IndependentAnimationStorage.cs / 2 / IndependentAnimationStorage.cs
// IndependentAnimationStorage.cs using MS.Internal; using System.Collections.Generic; using System.Diagnostics; using System.Windows.Threading; using System.Windows.Media.Composition; namespace System.Windows.Media.Animation { ////// /// internal abstract class IndependentAnimationStorage : AnimationStorage, DUCE.IResource { protected MediaContext.ResourcesUpdatedHandler _updateResourceHandler; protected DUCE.MultiChannelResource _duceResource = new DUCE.MultiChannelResource(); private bool _isValid = true; #region Constructor protected IndependentAnimationStorage() : base() { } #endregion #region Protected protected abstract void UpdateResourceCore(DUCE.Channel channel); // // Method which returns the DUCE type of this class. // The base class needs this type when calling CreateOrAddRefOnChannel. // By providing this via a virtual, we avoid a per-instance storage cost. // protected abstract DUCE.ResourceType ResourceType { get; } #endregion #region DUCE.IResource ////// AddRefOnChannel /// DUCE.ResourceHandle DUCE.IResource.AddRefOnChannel(DUCE.Channel channel) { // using (CompositionEngineLock.Acquire()) { #if DEBUG // We assume that a multi-channel resource can only be multi-channel // if it is Frozen and does not have animated properties. In this case we know // the target resource has at least one animated property so we expect that this // independently animated property resource will only be added to the channel // associated with the MediaContext associated with the target object's Dispatcher. DependencyObject d = (DependencyObject)_dependencyObject.Target; // I'm not sure how our target animated DependencyObject would get garbage // collected before we call AddRefOnChannel on one of its animated property // resources, but if it happens it will be a bad thing. Debug.Assert(d != null); // Any animated DependencyObject must be associated with a Dispatcher because the // AnimationClocks doing the animating must be associated with a Dispatcher. Debug.Assert(d.Dispatcher != null); // Make sure the target belongs to this thread Debug.Assert(d.CheckAccess()); #endif if (_duceResource.CreateOrAddRefOnChannel(channel, ResourceType)) { _updateResourceHandler = new MediaContext.ResourcesUpdatedHandler(UpdateResource); UpdateResourceCore(channel); } return _duceResource.GetHandle(channel); } } ////// ReleaseOnChannel /// void DUCE.IResource.ReleaseOnChannel(DUCE.Channel channel) { // using (CompositionEngineLock.Acquire()) { Debug.Assert(_duceResource.IsOnChannel(channel)); //release from this channel _duceResource.ReleaseOnChannel(channel); if (!_duceResource.IsOnAnyChannel) { // If this was the last reference on the channel then clear up our state. // Again, we assume here that if the target DependencyObject is animated that // it will be associated with a Dispatcher and that this animation resource // will also be associated with that Dispatcher's channel. DependencyObject d = (DependencyObject)_dependencyObject.Target; // DependencyObject shouldn't have been garbage collected before we've // released all of its property animation resources. Debug.Assert(d != null); // The target DependencyObject should be associated with a Dispatcher. Debug.Assert(d.Dispatcher != null); // Make sure the target belongs to this thread Debug.Assert(d.CheckAccess()); // If we're invalid, that means we've added our _updateResourceHandler to the // MediaContext's ResourcesUpdated event. Since we've been entirely released // from the channel we can cancel this update by removing the handler. if (!_isValid) { MediaContext mediaContext = MediaContext.From(d.Dispatcher); mediaContext.ResourcesUpdated -= _updateResourceHandler; _isValid = true; } _updateResourceHandler = null; } } } ////// Returns the DUCE.ResourceHandle associated with this resource. /// DUCE.ResourceHandle DUCE.IResource.GetHandle(DUCE.Channel channel) { DUCE.ResourceHandle handle; using (CompositionEngineLock.Acquire()) { handle = _duceResource.GetHandle(channel); } return handle; } int DUCE.IResource.GetChannelCount() { return _duceResource.GetChannelCount(); } DUCE.Channel DUCE.IResource.GetChannel(int index) { return _duceResource.GetChannel(index); } ////// This is only implemented by Visual and Visual3D. /// void DUCE.IResource.RemoveChildFromParent(DUCE.IResource parent, DUCE.Channel channel) { throw new NotImplementedException(); } ////// This is only implemented by Visual and Visual3D. /// DUCE.ResourceHandle DUCE.IResource.Get3DHandle(DUCE.Channel channel) { throw new NotImplementedException(); } #endregion #region Private private void UpdateResource(DUCE.Channel channel, bool skipOnChannelCheck) { Debug.Assert(!skipOnChannelCheck || _duceResource.IsOnChannel(channel)); if (skipOnChannelCheck || _duceResource.IsOnChannel(channel)) { UpdateResourceCore(channel); _isValid = true; } } #endregion #region Internal ////// If necessary this method will add an event handler to the MediaContext's /// ResourcesUpdated event which will be raised the next time we render. This prevents us /// from updating this animated property value resource more than once per rendered frame. /// internal void InvalidateResource() { // If _isValid is false we've already added the event handler for the next frame. // If _updateResourceHandler is null we haven't been added to our channel yet so // there's no need to update anything. if ( _isValid && _updateResourceHandler != null) { DependencyObject d = (DependencyObject)_dependencyObject.Target; // If d is null it means the resource that we're animating has been garbage // collected and had not fully been released it from its channel. This is // highly unlikely and if it occurs something has gone horribly wrong. Debug.Assert(d != null); // Just make sure that this resource has been added to the channel associated // with the MediaContext associated with the target object's Dispatcher. Debug.Assert(_duceResource.IsOnAnyChannel); // Set this flag so that we won't add the event handler to the MediaContext's // ResourcesUpdated event again before the next frame is rendered. _isValid = false; MediaContext.CurrentMediaContext.ResourcesUpdated += _updateResourceHandler; } } #endregion #region Static helper methods internal static DUCE.ResourceHandle GetResourceHandle(DependencyObject d, DependencyProperty dp, DUCE.Channel channel) { Debug.Assert(d != null); Debug.Assert(dp != null); Debug.Assert(d is Animatable ? ((Animatable)d).HasAnimatedProperties : true); IndependentAnimationStorage storage = AnimationStorage.GetStorage(d, dp) as IndependentAnimationStorage; if (storage == null) { return DUCE.ResourceHandle.Null; } else { Debug.Assert(storage._duceResource.IsOnChannel(channel)); return ((DUCE.IResource)storage).GetHandle(channel); } } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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