DoubleAnimation on RotateTransform.Angle not working on Unreal

lehoang03an · 14 Jun 2022, 13:30

Hello,
In this xaml, I try to rotate an image when control is loaded

<ControlTemplate x:Key="PlayerInfoPanel" TargetType="{x:Type ContentControl}">
            <ControlTemplate.Resources>
                <Storyboard x:Key="EndlessRotate">
                    <DoubleAnimation
                        Storyboard.TargetProperty="(RenderTransform).(RotateTransform.Angle)" Storyboard.TargetName="Loading"
                        To="360" Duration="0:0:1.5" RepeatBehavior="Forever"/>
                </Storyboard>
            </ControlTemplate.Resources>
            <Grid>
                <Image x:Name="Loading" Visibility="Visible" 
                       Source="Dummy_Loading.png" Width="40" HorizontalAlignment="Right" VerticalAlignment="Center" Margin="0,0,14,0" RenderTransformOrigin="0.5,0.5" >
                    <Image.RenderTransform>
                        <RotateTransform/>
                    </Image.RenderTransform>
                </Image></Grid>
            <ControlTemplate.Triggers>
                <EventTrigger RoutedEvent="Loaded">
                    <BeginStoryboard Storyboard="{StaticResource EndlessRotate}" x:Name="AnimationBeginStoryboard"/>
                </EventTrigger>
            </ControlTemplate.Triggers>

It works in Blend, but when I import it to Unreal, it shows this error:

Unable to convert '(RenderTransform).(RotateTransform.Angle)' to a valid value for property DoubleAnimation.TargetProperty.
LogNoesis: Warning: Target property not set in timeline

Can you tell me what is wrong here?

14 Jun 2022, 15:08

When using parenthesis syntax to reference a property you have to specify the owner type and the property name in Noesis:

<DoubleAnimation
  Storyboard.TargetProperty="(UIElement.RenderTransform).(RotateTransform.Angle)"
  Storyboard.TargetName="Loading"
  To="360" Duration="0:0:1.5" RepeatBehavior="Forever"/>

The parenthesis syntax is required for attached properties, but the rest can be referenced by just the name, so the following will also work:

Storyboard.TargetProperty="RenderTransform.Angle"

lehoang03an · 15 Jun 2022, 06:02

Thanks, it works. Is there any advantage or usecase using parenthesis syntax?

15 Jun 2022, 10:39

It works in Blend, but when I import it to Unreal, it shows this error

I have added ticket #2361 to our bugtracker because using "(RenderTransform)" to reference a property in WPF it is supported and we need to fix it.

Is there any advantage or usecase using parenthesis syntax?

No, both syntaxes are equivalent. As I said the only specific scenario where using parenthesis is strictly required is for attached properties, like in
"(Canvas.Left)".

DoubleAnimation on RotateTransform.Angle not working on Unreal Topic is solved

DoubleAnimation on RotateTransform.Angle not working on Unreal

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