Trouble animating RadialGradientBrush in WPF
- by emddudley
I'm trying to animate a RadialGradientBrush in my application. I get the super helpful exception:
Additional information: 'System.Windows.Style' value cannot be assigned to property 'Style' of object 'System.Windows.Controls.Border'. '[Unknown]' property does not point to a DependencyObject in path '(0).(1).[0].(2)'. Error at object 'System.Windows.Style' in markup file 'Eng.Modules.Core;component/system/grid/systemgridview.xaml' Line 252 Position 51.
I know it's something wrong with the indirect property targeting or partial path qualification in my DoubleAnimation's Storyboard.TargetProperty attribute. Any ideas?
<Border>
<Border.Resources>
<RadialGradientBrush x:Key="SomeBrush">
<RadialGradientBrush.GradientStops>
<GradientStop Color="White" Offset="0" />
<GradientStop Color="Gold" Offset="1" />
</RadialGradientBrush.GradientStops>
</RadialGradientBrush>
</Border.Resources>
<Border.Style>
<Style TargetType="{x:Type Border}">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=IsEnabled, RelativeSource={RelativeSource Self}}" Value="True">
<Setter Property="Background" Value="{StaticResource SomeBrush}" />
<DataTrigger.EnterActions>
<BeginStoryboard x:Name="SomeStoryBoard">
<Storyboard>
<!-- RIGHT HERE -->
<DoubleAnimation
Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[0].(GradientStop.Offset)"
From="0" To="1" Duration="0:0:1"
RepeatBehavior="Forever"
AutoReverse="True" />
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
<DataTrigger.ExitActions>
<RemoveStoryboard BeginStoryboardName="SomeStoryBoard" />
</DataTrigger.ExitActions>
</DataTrigger>
</Style.Triggers>
</Style>
</Border.Style>
</Border>
