Wpf: Storyboard.TargetName works, but Setter TargetName doesn't.
- by MainMa
Hi,
Let's say we have a XAML code like this:
<Style TargetType="{x:Type ListBoxItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListBoxItem}">
<Border HorizontalAlignment="Center" VerticalAlignment="Center">
<Border.LayoutTransform>
<!--We are rotating randomly each image. Selected one will be rotated to 45°.-->
<RotateTransform Angle="{Binding RandomAngle}" x:Name="globalRotation"/>
</Border.LayoutTransform>
<Grid>
<Image Source="{Binding ImageLocation}" Stretch="None" />
<TextBlock x:Name="title" Text="{Binding Title}" />
</Grid>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter TargetName="title" Property="Visibility" Value="Visible"/>
<!--The next line will not compile.-->
<Setter TargetName="globalRotation" Property="Angle" Value="45"/>
<Trigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<!--This compiles well.-->
<DoubleAnimation Storyboard.TargetName="globalRotation" Storyboard.TargetProperty="Angle" To="45" Duration="00:00:03"/>
</Storyboard>
</BeginStoryboard>
</Trigger.EnterActions>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
This code is intended to display a set of images in a listbox. Each image has a random rotation, but when selected, rotates to 45 degrees.
Rotating selected image through a storyboard works well. I just specify Storyboard.TargetName and it rotates the image when selected (Trigger.ExitActions is omitted to make the code shorter).
Now, if I want, instead of using a storyboard, assign 45 degrees value directly, I can't do that, because <Setter TargetName="globalRotation" Property="Angle" Value="45"/>: it compiles with
"Cannot find the Trigger target 'globalRotation'. (The target must appear before any Setters, Triggers, or Conditions that use it.)"
error. What happens? I suppose that Storyboard.TargetName is evaluated during runtime, so let me compile it. Is it right?
How to make it work with just a setter, without using a storyboard?
