AnimationDemoPage throws an exception when clicking on the button during animation

[nicofr69]

Hello David,

The AnimationDemoPage throws an exception when clicking on the button during animation:

System.InvalidOperationException: An attempt was made to transition a task to a final state when it had already completed.

I found how to inactivate the button during the animation:

<Button.Behaviors>
<behaviors:EventHandlerBehavior EventName="Clicked">
<behaviors:SetPropertyAction TargetObject="{x:Reference runAnimationButton}"
PropertyName="IsEnabled" Value="false" />
<behaviors:SetPropertyAction
TargetObject="{x:Reference stopAnimationButton}"
PropertyName="IsEnabled"
Value="true" />
<behaviors:SetPropertyAction
TargetObject="{x:Reference stopAnimationButton}"
PropertyName="IsVisible"
Value="true" />
...
<behaviors:SetPropertyAction
TargetObject="{x:Reference runAnimationButton}"
PropertyName="IsEnabled" Value="true" />
<behaviors:SetPropertyAction
TargetObject="{x:Reference stopAnimationButton}"
PropertyName="IsEnabled"
Value="false" />

But I did not find how to cancel the animation by clicking on the "Stop animation" button.
Here what I tried out:
Above code for stopAnimationButton plus:

<Button x:Name="stopAnimationButton" Text="Stop animation (ineffective)" IsVisible="true" IsEnabled="false">
    <Button.Behaviors>
        <behaviors:EventHandlerBehavior EventName="Clicked">
            <behaviors:InvokeMethodAction TargetObject="{x:Reference animationPage}" MethodName="OnStopAnimation" />
            <behaviors:SetPropertyAction TargetObject="{x:Reference runAnimationButton}" PropertyName="IsEnabled" Value="true" />
        </behaviors:EventHandlerBehavior>
    </Button.Behaviors>
</Button>



public void OnStopAnimation(object sender, EventArgs args)
{
	//KO no animation.Commit(.., "animationID", ...) defined: this.AbortAnimation("animationID";
	//KO still same runtime exception: ViewExtensions.**CancelAnimations**(image);
	ViewExtensions.**CancelAnimations**(this); //KO: no effect (but no exception neither)
}

Any idea?
Thanks.

Best regards,
Nikolas

[andresgutice]

This comment isn't to help you, it's one to thank you for avoiding the exception when clicking on the button during animation, i hope you can find the solution to your problem :)