ObjectAnimationUsingKeyFrames Silverlight 3 Problem RSS

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  Aaron B

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  ObjectAnimationUsingKeyFrames Silverlight 3 Problem

  Jul 15, 2009 01:42 AM | LINK

  i have an ObjectAnimationUsingKeyFrames that was working in Silverlight 2. i upgraded to Silverlight 3 and now it seems to skip the last frame.

   

  the XAML looks like this:

         <UserControl.Resources>            <Storyboard x:Name="BusyImageStoryboard" RepeatBehavior="Forever">                  <ObjectAnimationUsingKeyFrames x:Name="BusyImageTimeline" Storyboard.TargetName="LayoutRoot" Storyboard.TargetProperty="Source"/>            </Storyboard>      </UserControl.Resources>

        <Image x:Name="LayoutRoot" VerticalAlignment="Center" Source="BusyImages/00_32x32-32.png" Stretch="None"/>

   

  the code looks like this:

         public partial class BusyImage: UserControl      {            public BusyImage()            {                  InitializeComponent();                  AddImageKeyFrames(BusyImageTimeline.KeyFrames, 18, 40.0, index => "BusyImageFrames/"+index.ToInvariantString().PadLeft(2, '0')+"_32x32-32.png");                  BusyImageStoryboard.Begin();            }             private static void AddImageKeyFrame(ObjectKeyFrameCollection keyFrames, int offsetInMilliseconds, string url)            {                  keyFrames.Add                  (                        new DiscreteObjectKeyFrame                        {                              KeyTime = new TimeSpan(0, 0, 0, 0, offsetInMilliseconds),                              Value = new BitmapImage(new Uri(url, UriKind.Relative))                        }                  );                  return;            }            private static void AddImageKeyFrames(ObjectKeyFrameCollection keyFrames, uint frameCount, double framesPerSecond, Func<uint,string> GetFrameURL)            {                  var millisecondsPerFrame = 1000.0/framesPerSecond;                   for (uint index=0;index!=frameCount;++index)                        AddImageKeyFrame(keyFrames, (int)((double)index*millisecondsPerFrame), GetFrameURL(index));                   return;            }

        }

   

  if you slow it down to 2 frames per second it’s easy to see where the frame is missing.

  Silverlight 3