Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Media / Animation / BeginStoryboard.cs / 1 / BeginStoryboard.cs
/****************************************************************************\ * * File: BeginStoryboard.cs * * This object includes a Storyboard reference. When triggered, the Storyboard * is started. * * Copyright (C) by Microsoft Corporation. All rights reserved. * \***************************************************************************/ using System.ComponentModel; // DefaultValueAttribute using System.Diagnostics; // Debug.Assert using System.Windows; // SR.Get using System.Windows.Documents; // TableTemplate using System.Windows.Markup; // IAddChild namespace System.Windows.Media.Animation { ////// BeginStoryboard will call begin on its Storyboard reference when /// it is triggered. /// [RuntimeNameProperty("Name")] // Enables INameScope.FindName to find BeginStoryboard objects. [ContentProperty("Storyboard")] // Enableschild without explicit tag. public sealed class BeginStoryboard : TriggerAction { /// /// Creates an instance of the BeginStoryboard object. /// public BeginStoryboard() : base() { } ////// DependencyProperty to back the Storyboard property /// public static readonly DependencyProperty StoryboardProperty = DependencyProperty.Register( "Storyboard", typeof(Storyboard), typeof(BeginStoryboard) ); ////// The Storyboard object that this action is associated with. This /// must be specified before Invoke is called. /// [DefaultValue(null)] public Storyboard Storyboard { get { return GetValue(StoryboardProperty) as Storyboard; } set { ThrowIfSealed(); SetValue( StoryboardProperty, value ); } } ////// Specify the hand-off behavior to use when starting the animation /// clocks in this storyboard /// [DefaultValue(HandoffBehavior.SnapshotAndReplace)] public HandoffBehavior HandoffBehavior { get { return _handoffBehavior; } set { ThrowIfSealed(); if(HandoffBehaviorEnum.IsDefined(value)) { _handoffBehavior = value; } else { throw new ArgumentException(SR.Get(SRID.Storyboard_UnrecognizedHandoffBehavior)); } } } ////// The name to use for referencing this Storyboard. This named is used /// by a control action such as pause and resume. Defaults to null, which /// means this storyboard is not going to be interactively controlled. /// // Null == no interactive control == "Fire and Forget" [DefaultValue(null)] public string Name { get { return _name; } set { ThrowIfSealed(); if(value != null && !System.Windows.Markup.NameValidationHelper.IsValidIdentifierName(value)) { // Duplicate the error string thrown from DependencyObject.SetValueValidateParams throw new ArgumentException(SR.Get(SRID.InvalidPropertyValue, value, "Name")); } // Null is OK - it's to remove whatever name was previously set. _name = value; } } private void ThrowIfSealed() { if (IsSealed) { throw new InvalidOperationException(SR.Get(SRID.CannotChangeAfterSealed, "BeginStoryboard")); } } // Bug #1329664 workaround to make beta 2 // Remove thread affinity when sealed, but before doing that, snapshot the // current Storyboard value and remove *its* thread affinity too. internal override void Seal() { if( !IsSealed ) { // Gets our Storyboard value. This value may have come from a // ResourceReferenceExpression or might have been a deferred // reference that has since been realized. Storyboard snapshot = GetValue(StoryboardProperty) as Storyboard; if( snapshot == null ) { // This is the same error thrown by Begin if the Storyboard // property couldn't be resolved at Begin time. Since we're // not allowing changes after this point, lack of resolution // here means the same thing. throw new InvalidOperationException(SR.Get(SRID.Storyboard_StoryboardReferenceRequired)); } // We're planning to break our thread affinity - we also need to // make sure the Storyboard can also be used accross threads. if(!snapshot.CanFreeze) { throw new InvalidOperationException(SR.Get(SRID.Storyboard_UnableToFreeze)); } if(!snapshot.IsFrozen) { snapshot.Freeze(); } // Promote that snapshot into a local value. This is a no-op if it // was a deferred reference or local Storyboard, but if it came from a // ResourceReferenceExpression it will replace the Expression object // with a snapshot of its current value. Storyboard = snapshot; } else { ; // base.Seal() will throw exception for us if already sealed. } base.Seal(); // Now we can break our thread affinity DetachFromDispatcher(); } ////// Called when it's time to execute this storyboard action /// internal sealed override void Invoke( FrameworkElement fe, FrameworkContentElement fce, Style targetStyle, FrameworkTemplate frameworkTemplate, Int64 layer ) { Debug.Assert( fe != null || fce != null, "Caller of internal function failed to verify that we have a FE or FCE - we have neither." ); INameScope nameScope = null; if( targetStyle != null ) { nameScope = targetStyle; } else { Debug.Assert( frameworkTemplate != null ); nameScope = frameworkTemplate; } Begin( (fe != null ) ? (DependencyObject)fe : (DependencyObject)fce, nameScope, layer ); } internal sealed override void Invoke( FrameworkElement fe ) { Debug.Assert( fe != null, "Invoke needs an object as starting point"); Begin( fe, null, Storyboard.Layers.ElementEventTrigger ); } private void Begin( DependencyObject targetObject, INameScope nameScope, Int64 layer ) { if( Storyboard == null ) { throw new InvalidOperationException(SR.Get(SRID.Storyboard_StoryboardReferenceRequired)); } if( Name != null ) { Storyboard.BeginCommon(targetObject, nameScope, _handoffBehavior, true /* == is controllable */, layer ); } else { Storyboard.BeginCommon(targetObject, nameScope, _handoffBehavior, false /* == not controllable */, layer ); } } private HandoffBehavior _handoffBehavior = HandoffBehavior.SnapshotAndReplace; private string _name = null; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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