WPF: How to alter animation properties and resume a storyboard where it had stopped

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Hello, I would like to dynamically modify animation properties, like From, To or Duration. I managed to do this. However, the current solution restarts the animation from the beginning, which I do not like.

Storyboard story = RectanglesControl.FindResource("RectanglesAnimationStoryboard") as Storyboard;
TimeSpan time = story.GetCurrentTime();
story.Stop();
ThicknessAnimation anim = (ThicknessAnimation)story.Children[0];
Thickness zero = new Thickness(0, 0, 0, 0);
Thickness off = new Thickness(0, -x, 0, 0);
    anim.From = zero;
    anim.To = off;
anim.Duration = new Duration(TimeSpan.FromMilliseconds(mt));
story.Begin(this, true);
story.Seek(time);

XAML:

HTML

<Storyboard x:Key="RectanglesAnimationStoryboard">
    <ThicknessAnimation Storyboard.TargetProperty="Margin"
                        Storyboard.TargetName="RectanglesControl" From="0,-40,0,0" 
                        To="0,0,0,0" RepeatBehavior="Forever" Duration="0:0:1" />
</Storyboard>

My unsuccessful trials are in italic.

How to resume a storyboard to a previous state after making the above modifications?

Posted 30-Jan-12 12:14pm

Lutosław

Updated 30-Jan-12 12:17pm

v4

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Christian Graus · Answer 1 · 2012-01-30T14:34:00

Solution 1

Is there an event on the storyboard when it starts ? I'd do your seek inside that event, because with a lot of WPF stuff, it needs to be running before you can set it's position. I am sure there's a 'storyboard position changed' type event, at least.

Posted 30-Jan-12 14:34pm

Christian Graus

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Lutosław 2-Feb-12 19:09pm

No success. Tried to code
void RectanglesAnimationStoryboard_CurrentTimeInvalidated(object sender, EventArgs e)
{
if (seek != null)
{
//var clockGroup = sender as ClockGroup;
//clockGroup.Timeline.???
RectanglesAnimationStoryboard.Seek(seek.Value);
seek = null;
}
}
It changed /something/ -- it does seek but it still is not fluent. What is interesting -- it is more accurate at the beginning, but if the changes are applied many times (user can change a speed of an animation) and an uptime is bigger, then the accuracy drops.