MediaTimeline.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / MediaTimeline.cs / 2 / MediaTimeline.cs
                        
                        
                            //------------------------------------------------------------------------------ 
//  Microsoft Avalon
//  Copyright (c) Microsoft Corporation, 2003
//
//  File:       MediaTimeline.cs 
//
//----------------------------------------------------------------------------- 
using System; 
using System.Diagnostics;
using System.ComponentModel; 
using MS.Internal;
using System.Windows.Media.Animation;
using System.Windows.Media;
using System.Windows.Media.Composition; 
using System.Windows.Markup;
using System.Windows.Threading; 
using System.Runtime.InteropServices; 
using System.IO;
using System.Collections; 
using System.Collections.Generic;

using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID; 

namespace System.Windows.Media 
{ 
    #region MediaTimeline
 

    /// 
    /// MediaTimeline functions as a template for creating MediaClocks. Whenever
    /// you create a MediaClock it inherits all of the properties and events of 
    /// the MediaTimeline. Whenever you change a property or register for an
    /// event on a MediaTimeline, all of those changes get propagated down to 
    /// every MediaClock created off of that MediaTimeline (and any future 
    /// MediaClocks created from it too).
    ///  
    public partial class MediaTimeline : Timeline, IUriContext
    {
        internal const uint LastTimelineFlag = 0x1;
        #region Constructor 

        ///  
        /// Creates a new MediaTimeline. 
        /// 
        /// Source of the media. 
        public MediaTimeline(Uri source) : this()
        {
            Source = source;
        } 

        ///  
        /// Creates a new MediaTimeline. 
        /// 
        /// Context used to resolve relative URIs 
        /// Source of the media.
        internal MediaTimeline(ITypeDescriptorContext context, Uri source) : this()
        {
            _context = context; 
            Source = source;
        } 
 
        /// 
        /// Creates a new MediaTimeline. 
        /// 
        public MediaTimeline()
        {
        } 

        ///  
        /// Creates a new MediaTimeline. 
        /// 
        /// The value for the BeginTime property 
        public MediaTimeline(Nullable beginTime) : this()
        {
            BeginTime = beginTime;
        } 

        ///  
        /// Creates a new MediaTimeline. 
        /// 
        /// The value for the BeginTime property 
        /// The value for the Duration property
        public MediaTimeline(Nullable beginTime, Duration duration)
            : this()
        { 
            BeginTime = beginTime;
            Duration = duration; 
        } 

        ///  
        /// Creates a new MediaTimeline.
        /// 
        /// The value for the BeginTime property
        /// The value for the Duration property 
        /// The value for the RepeatBehavior property
        public MediaTimeline(Nullable beginTime, Duration duration, RepeatBehavior repeatBehavior) 
            : this() 
        {
            BeginTime = beginTime; 
            Duration = duration;
            RepeatBehavior = repeatBehavior;
        }
 
        #endregion
 
        #region IUriContext implementation 
        /// 
        /// Base Uri to use when resolving relative Uri's 
        /// 
        Uri IUriContext.BaseUri
        {
            get 
            {
                return _baseUri; 
            } 
            set
            { 
                _baseUri = value;
            }
        }
        #endregion 

 
        #region Timeline 

        ///  
        /// Called by the Clock to create a type-specific clock for this
        /// timeline.
        /// 
        ///  
        /// A clock for this timeline.
        ///  
        ///  
        /// If a derived class overrides this method, it should only create
        /// and return an object of a class inheriting from Clock. 
        /// 
        protected internal override Clock AllocateClock()
        {
            if (Source == null) 
            {
                throw new InvalidOperationException(SR.Get(SRID.Media_UriNotSpecified)); 
            } 

            MediaClock mediaClock = new MediaClock(this); 

            return mediaClock;
        }
 
        /// 
        /// Called by the base Freezable class to make this object 
        /// frozen. 
        /// 
        protected override bool FreezeCore(bool isChecking) 
        {
            bool canFreeze = base.FreezeCore(isChecking);
            if (!canFreeze)
            { 
                return false;
            } 
 
            // First, if checking, make sure that we don't have any expressions
            // on our properties.  (base.FreezeCore takes care of animations) 
            if (isChecking)
            {
                canFreeze &= !HasExpression(LookupEntry(SourceProperty.GlobalIndex), SourceProperty);
            } 

            return canFreeze; 
        } 

        ///  
        /// Implementation of Freezable.CloneCore.
        /// 
        protected override void CloneCore(Freezable sourceFreezable)
        { 
            MediaTimeline sourceTimeline = (MediaTimeline) sourceFreezable;
            base.CloneCore(sourceFreezable); 
 
            CopyCommon(sourceTimeline);
        } 

        /// 
        /// Implementation of Freezable.CloneCurrentValueCore.
        ///  
        protected override void CloneCurrentValueCore(Freezable sourceFreezable)
        { 
            MediaTimeline sourceTimeline = (MediaTimeline) sourceFreezable; 
            base.CloneCurrentValueCore(sourceFreezable);
 
            CopyCommon(sourceTimeline);
        }

        ///  
        /// Implementation of Freezable.GetAsFrozenCore.
        ///  
        protected override void GetAsFrozenCore(Freezable source) 
        {
            MediaTimeline sourceTimeline = (MediaTimeline) source; 
            base.GetAsFrozenCore(source);

            CopyCommon(sourceTimeline);
        } 

        ///  
        /// Implementation of Freezable.GetCurrentValueAsFrozenCore. 
        /// 
        protected override void GetCurrentValueAsFrozenCore(Freezable source) 
        {
            MediaTimeline sourceTimeline = (MediaTimeline) source;
            base.GetCurrentValueAsFrozenCore(source);
 
            CopyCommon(sourceTimeline);
        } 
 
        private void CopyCommon(MediaTimeline sourceTimeline)
        { 
            _context = sourceTimeline._context;
            _baseUri = sourceTimeline._baseUri;
        }
 
        /// 
        /// Creates a new MediaClock using this MediaTimeline. 
        ///  
        /// A new MediaClock.
        public new MediaClock CreateClock() 
        {
            return (MediaClock)base.CreateClock();
        }
 
        /// 
        /// Return the duration from a specific clock 
        ///  
        /// 
        /// The Clock whose natural duration is desired. 
        /// 
        /// 
        /// A Duration quantity representing the natural duration.
        ///  
        protected override Duration GetNaturalDurationCore(Clock clock)
        { 
            MediaClock mc = (MediaClock)clock; 
            if (mc.Player == null)
            { 
                return Duration.Automatic;
            }
            else
            { 
                return mc.Player.NaturalDuration;
            } 
        } 

        #endregion 

        #region ToString

        ///  
        /// Persist MediaTimeline in a string
        ///  
        public override string ToString() 
        {
            if (null == Source) 
                throw new InvalidOperationException(SR.Get(SRID.Media_UriNotSpecified));

            return Source.ToString();
        } 

        #endregion 
 
        internal ITypeDescriptorContext _context = null;
 
        private Uri _baseUri = null;
    }

    #endregion 
};

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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