Begin Storyboard on more than one target

Question

I have a subclassed ListBox with a "SelectedItemChanging" dependency property that is set to a Storyboard. When the selected item is changed, I want to run this Storyboard on each item in the ListBox.

How is this possible with a single instance of Storyboard?

Answer 1

Storyboards can be keyed and run from multiple triggers, and it works great as long as it's set up properly. If I am understanding you correctly, you're hoping to apply the storyboard to each individual ListBoxItem. In which case, why not make a style, and on that style's triggers, fire the storyboard.

Excuse my pseudocode.

<Storyboard x:Key="MyEnterStoryboard">
  <!-- Do Enter Work -->
</Storyboard>

<Storyboard x:Key="MyExitStoryboard">
  <!-- Do Exit Work -->
</Storyboard>

<Style TargetType="{x:Type ListBoxItem}">
    <Style.Triggers>
        <Trigger Property="SelectedItemChanging" Value="True">
            <Trigger.EnterActions>
                <BeginStoryboard Storyboard="{StaticResource MyEnterStoryboard}"/>
            </Trigger.EnterActions>
            <Trigger.ExitActions>
                <BeginStoryboard Storyboard="{StaticResource MyExitStoryboard}"/>
            </Trigger.ExitActions>
        </Trigger>
    </Style.Triggers>
</Style>

Answer 2

WPF Storyboards have a Clone method. Silverlight doesn't have this but thought I'd post it just in case someone stumbles across this post looking for a WPF solution.