TimelineGroup.cs source code in C# .NET

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Code:

/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / Animation / TimelineGroup.cs / 1 / TimelineGroup.cs

                            //---------------------------------------------------------------------------- 
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
// 
//--------------------------------------------------------------------------- 

 
using System.ComponentModel; 
using System.Diagnostics;
using System.Runtime.InteropServices; 
using System.Windows.Markup;

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

namespace System.Windows.Media.Animation 
{ 
    /// 
    /// This class represents base class for Timelines that have functionality 
    /// related to having Children.
    /// 
    [ContentProperty("Children")]
    public abstract partial class TimelineGroup : Timeline, IAddChild 
    {
        #region Constructors 
 
        /// 
        /// Creates a TimelineGroup with default properties. 
        /// 
        protected TimelineGroup()
            : base()
        { 
        }
 
        ///  
        /// Creates a TimelineGroup with the specified BeginTime.
        ///  
        /// 
        /// The scheduled BeginTime for this TimelineGroup.
        /// 
        protected TimelineGroup(Nullable beginTime) 
            : base(beginTime)
        { 
        } 

        ///  
        /// Creates a TimelineGroup with the specified begin time and duration.
        /// 
        /// 
        /// The scheduled BeginTime for this TimelineGroup. 
        /// 
        ///  
        /// The simple Duration of this TimelineGroup. 
        /// 
        protected TimelineGroup(Nullable beginTime, Duration duration) 
            : base(beginTime, duration)
        {
        }
 
        /// 
        /// Creates a TimelineGroup with the specified BeginTime, Duration and RepeatBehavior. 
        ///  
        /// 
        /// The scheduled BeginTime for this TimelineGroup. 
        /// 
        /// 
        /// The simple Duration of this TimelineGroup.
        ///  
        /// 
        /// The RepeatBehavior for this TimelineGroup. 
        ///  
        protected TimelineGroup(Nullable beginTime, Duration duration, RepeatBehavior repeatBehavior)
            : base(beginTime, duration, repeatBehavior) 
        {
        }

        #endregion 

        #region Timeline 
 
        /// 
        /// 
        /// 
        /// 
        protected internal override Clock AllocateClock()
        { 
            return new ClockGroup(this);
        } 
 
        /// 
        /// Creates a new ClockGroup using this TimelineGroup. 
        /// 
        /// A new ClockGroup.
        new public ClockGroup CreateClock()
        { 
            return (ClockGroup)base.CreateClock();
        } 
 
        #endregion
 
        #region IAddChild interface

        /// 
        /// Adds a child object to this TimelineGroup. 
        /// 
        ///  
        /// The child object to add. 
        /// 
        ///  
        /// A Timeline only accepts another Timeline (or derived class) as
        /// a child.
        /// 
        void IAddChild.AddChild(object child) 
        {
            WritePreamble(); 
 
            if (child == null)
            { 
                throw new ArgumentNullException("child");
            }

            AddChild(child); 

            WritePostscript(); 
        } 

        ///  
        /// This method performs the core functionality of the AddChild()
        /// method on the IAddChild interface.  For a Timeline this means
        /// determining adding the child parameter to the Children collection
        /// if it's a Timeline. 
        /// 
        ///  
        /// This method is the only core implementation.  It does not call 
        /// WritePreamble() or WritePostscript().  It also doesn't throw an
        /// ArgumentNullException if the child parameter is null.  These tasks 
        /// are performed by the interface implementation.  Therefore, it's OK
        /// for a derived class to override this method and call the base
        /// class implementation only if they determine that it's the right
        /// course of action.  The derived class can rely on Timeline's 
        /// implementation of IAddChild.AddChild or implement their own
        /// following the Freezable pattern since that would be a public 
        /// method. 
        /// 
        /// An object representing the child that 
        /// should be added.  If this is a Timeline it will be added to the
        /// Children collection; otherwise an exception will be thrown.
        /// The child parameter is not a
        /// Timeline. 
        [EditorBrowsable(EditorBrowsableState.Advanced)]
        protected virtual void AddChild(object child) 
        { 
            Timeline timelineChild = child as Timeline;
 
            if (timelineChild == null)
            {
                throw new ArgumentException(SR.Get(SRID.Timing_ChildMustBeTimeline), "child");
            } 
            else
            { 
                Children.Add(timelineChild); 
            }
        } 

        /// 
        /// Adds a text string as a child of this Timeline.
        ///  
        /// 
        /// The text to add. 
        ///  
        /// 
        /// A Timeline does not accept text as a child, so this method will 
        /// raise an InvalididOperationException unless a derived class has
        /// overridden the behavior to add text.
        /// 
        /// The childText parameter is 
        /// null.
        void IAddChild.AddText(string childText) 
        { 
            WritePreamble();
 
            if (childText == null)
            {
                throw new ArgumentNullException("childText");
            } 

            AddText(childText); 
 
            WritePostscript();
        } 

        /// 
        /// This method performs the core functionality of the AddText()
        /// method on the IAddChild interface.  For a Timeline this means 
        /// throwing and InvalidOperationException because it doesn't
        /// support adding text. 
        ///  
        /// 
        /// This method is the only core implementation.  It does not call 
        /// WritePreamble() or WritePostscript().  It also doesn't throw an
        /// ArgumentNullException if the childText parameter is null.  These tasks
        /// are performed by the interface implementation.  Therefore, it's OK
        /// for a derived class to override this method and call the base 
        /// class implementation only if they determine that it's the right
        /// course of action.  The derived class can rely on Timeline's 
        /// implementation of IAddChild.AddChild or implement their own 
        /// following the Freezable pattern since that would be a public
        /// method. 
        /// 
        /// A string representing the child text that
        /// should be added.  If this is a Timeline an exception will be
        /// thrown. 
        /// Timelines have no way
        /// of adding text. 
        [EditorBrowsable(EditorBrowsableState.Advanced)] 
        protected virtual void AddText(string childText)
        { 
            throw new InvalidOperationException(SR.Get(SRID.Timing_NoTextChildren));
        }

        #endregion // IAddChild interface 
    }
} 

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

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