How to Apply Blend Behaviors to Multiple Objects Using Style Setters in XAML?

Add blending behavior in style setter

Question:

You want to use the style setter to set the blending behavior to all buttons in your application. However, you encounter the error "Property 'Behaviors' has no accessible setter".

Solution:

The main challenge here is that behaviors are associated with specific objects, and the same behavior instance cannot be used for multiple objects. Additionally, behavior attached properties have no setters and can only be added inline.

To overcome these limitations:

• Define your behavior and trigger collection classes.
• Create custom attached properties to manipulate main behavior and trigger properties.
• Set the x:Shared attribute to False so that a new copy is created every time the resource is referenced.
• Take advantage of the additive nature of behaviors and triggers by adding behavior and trigger properties instead of replacing them.

Here is an example using this method:

<Grid>
    <Grid.Resources>
        <String x:Key="stringResource1">stringResource1</String>
        <Triggers x:Key="debugTriggers" x:Shared="False">
            <EventTrigger EventName="MouseLeftButtonDown">
                <DebugAction Message="DataContext: {0}" MessageParameter="{Binding}" />
                <DebugAction Message="ElementName: {0}" MessageParameter="{Binding Text, ElementName=textBlock2}" />
                <DebugAction Message="Mentor: {0}" MessageParameter="{Binding Text, RelativeSource={RelativeSource AncestorType={x:Type FrameworkElement}}}" />
            </EventTrigger>
        </Triggers>
        <Setter Property="local:SupplementaryInteraction.Triggers" Value="{StaticResource debugTriggers}" />
    </Grid.Resources>
    <StackPanel DataContext="{StaticResource stringResource1}">
        <TextBlock Name="textBlock1" Style="{StaticResource debugBehavior}" Text="textBlock1" />
        <TextBlock Name="textBlock2" Style="{StaticResource debugBehavior}" Text="textBlock2" />
        <TextBlock Name="textBlock3" Style="{StaticResource debugBehavior}" Text="textBlock3" />
    </StackPanel>
</Grid>

This approach allows you to apply behaviors and triggers to multiple objects via style setters, making it easy to reuse common behavioral functionality across your application.

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