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Animation on other targets
Last Post 09 Jul 2015 08:49 AM by Filip Dušek. 1 Replies.
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J. Alan AthertonUser is Offline
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Posts:45


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09 Jul 2015 12:41 AM
    I am trying to make an animation happen for a StackPanel when a button is pressed. The effect I want is a sliding menu that appears when a button is pressed. I know the animation itself works because I currently have it connected to the visibility property.

    Here's what I am trying now:
        <Canvas Background="Transparent" x:Name="backgroundCanvas">
            <StackPanel x:Name="PathPanel" Orientation="Vertical" Canvas.Left="50" Canvas.Top="0" MinWidth="500" Width="Auto" Background="#E0E8F0">
    


    The StackPanel of interest has name PathPanel.

    Farther down, a child of PathPanel:
                <ToggleButton Content="Paths"  Focusable="False" x:Name="PathToggle">
                    <ToggleButton.Triggers>
                        <EventTrigger RoutedEvent="ToggleButton.Unchecked">
                            <BeginStoryboard>
                                <Storyboard>
                                    <DoubleAnimation Storyboard.TargetName="PathPanel" Storyboard.TargetProperty="(Canvas.Top)" From="-200" To="0" Duration="0:0:0.25" >
                                        <DoubleAnimation.EasingFunction>
                                            <PowerEase EasingMode="EaseOut" />
                                        </DoubleAnimation.EasingFunction>
    
                                    </DoubleAnimation>
                                </Storyboard>
                            </BeginStoryboard>
    
                        </EventTrigger>
                    </ToggleButton.Triggers>
    
                </ToggleButton>
    


    When I uncheck the toggle button, I get an ArgumentNullException in the UI UpdateInput method call. It appears to be the Storyboard.TargetName that causes the problem. Is there a way to do this?
    Filip DušekUser is Offline
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    Posts:669


    --
    09 Jul 2015 08:49 AM
    Yes, this would work only in Control Template in current version. The problem is that when I was implementing animations I still didn't have good way to find a control by name outside of Templates. I do have that now, so let me add this feature to my priority list.

    BUT I knew that this can be an issue so there is a workaround. It's little hack, which I left there in case I need something like this. You can make a method in partial class for your UI Root like this:

            public void SetAnimTarget()
            {            
                EventTrigger trigger = PathToggle.Triggers[0] as EventTrigger;
                BeginStoryboard begin = trigger.Actions[0] as BeginStoryboard;
                Storyboard.SetTarget(begin.Storyboard.Children[0], PathPanel);
            } 
    


    Don't forget to call this method somewhere. The way it works is very simple. If you set Target for animation, it will be used without searching for target by name.
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