ParallelTimeline.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

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

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

using MS.Internal; 
 
using System;
using System.Collections; 
using System.Collections.Generic;
using System.Diagnostics;
using System.ComponentModel;
 
namespace System.Windows.Media.Animation
{ 
    ///  
    /// This class represents a group of Timelines where the children
    /// become active according to the value of their Begin property rather 
    /// than their specific order in the Children collection. Children
    /// are also able to overlap and run in parallel with each other.
    /// 
    public partial class ParallelTimeline : TimelineGroup 
    {
        #region Constructors 
 
        /// 
        /// Creates a ParallelTimeline with default properties. 
        /// 
        public ParallelTimeline()
            : base()
        { 
        }
 
        ///  
        /// Creates a ParallelTimeline with the specified BeginTime.
        ///  
        /// 
        /// The scheduled BeginTime for this ParallelTimeline.
        /// 
        public ParallelTimeline(TimeSpan? beginTime) 
            : base(beginTime)
        { 
        } 

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

        #endregion 

        #region Methods 
 
        /// 
        /// 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)
        { 
            Duration simpleDuration = TimeSpan.Zero;

            ClockGroup clockGroup = clock as ClockGroup;
 
            if (clockGroup != null)
            { 
                List children = clockGroup.InternalChildren; 

                // The container ends when all of its children have ended at least 
                // one of their active periods.
                if (children != null)
                {
                    bool hasChildWithUnresolvedDuration = false; 

                    for (int childIndex = 0; childIndex < children.Count; childIndex++) 
                    { 
                        Duration childEndOfActivePeriod = children[childIndex].EndOfActivePeriod;
 
                        if (childEndOfActivePeriod == Duration.Forever)
                        {
                            // If we have even one child with a duration of forever
                            // our resolved duration will also be forever. It doesn't 
                            // matter if other children have unresolved durations.
                            return Duration.Forever; 
                        } 
                        else if (childEndOfActivePeriod == Duration.Automatic)
                        { 
                            hasChildWithUnresolvedDuration = true;
                        }
                        else if (childEndOfActivePeriod > simpleDuration)
                        { 
                            simpleDuration = childEndOfActivePeriod;
                        } 
                    } 

                    // We've iterated through all our children. We know that at this 
                    // point none of them have a duration of Forever or we would have
                    // returned already. If any of them still have unresolved
                    // durations then our duration is also still unresolved and we
                    // will return automatic. Otherwise, we'll fall out of the 'if' 
                    // block and return the simpleDuration as our final resolved
                    // duration. 
                    if (hasChildWithUnresolvedDuration) 
                    {
                        return Duration.Automatic; 
                    }
                }
            }
 
            return simpleDuration;
        } 
 
        #endregion
 


        #region SlipBehavior Property
 
        /// 
        /// SlipBehavior Property 
        ///  
        public static readonly DependencyProperty SlipBehaviorProperty =
            DependencyProperty.Register( 
                "SlipBehavior",
                typeof(SlipBehavior),
                typeof(ParallelTimeline),
                new PropertyMetadata( 
                    SlipBehavior.Grow,
                    new PropertyChangedCallback(ParallelTimeline_PropertyChangedFunction)), 
                new ValidateValueCallback(ValidateSlipBehavior)); 

 
        private static bool ValidateSlipBehavior(object value)
        {
            return TimeEnumHelper.IsValidSlipBehavior((SlipBehavior)value);
        } 

        ///  
        /// Returns the SlipBehavior for this ClockGroup 
        /// 
        [DefaultValue(SlipBehavior.Grow)] 
        public SlipBehavior SlipBehavior
        {
            get
            { 
                return (SlipBehavior)GetValue(SlipBehaviorProperty);
            } 
            set 
            {
                SetValue(SlipBehaviorProperty, value); 
            }
        }

        internal static void ParallelTimeline_PropertyChangedFunction(DependencyObject d, 
                                                                      DependencyPropertyChangedEventArgs e)
        { 
            ((ParallelTimeline)d).PropertyChanged(e.Property); 
        }
 
        #endregion // SlipBehavior Property
    }
}

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

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