How to Effectively Add Blend Behaviors to Multiple Objects Using Styles in XAML?

Add blending behavior in style setter

When creating a custom mixin behavior for a button, it can be challenging to set it up for all buttons in your application. Using inline XAML, you can associate specific behavior with a single object. However, this approach encounters limitations when setting behavior through styles that can be applied to multiple targets.

Problems setting behavior in styles

The main problem is that behaviors and triggers are intrinsically tied to specific objects. When using inline XAML, XAML enforces this one-to-one relationship. However, defining behavior in styles breaks this principle because styles can be reused in multiple targets. This results in underlying behavioral class exceptions.

Additionally, access to the "Behaviors" properties related to interactions is restricted, preventing us from setting values ​​via styles.

Solution: Use custom triggers and behavior collections

To address these challenges, the developers designed a solution utilizing custom behaviors and trigger collection classes. These classes enable us to create and modify behavior in styles.

The key principles behind this solution focus on:

1. Creates a new instance of the behavior collection for each target style.
2. Use custom attached properties to handle actions on main behavior and trigger properties.
3. Recognize that behaviors and triggers are additive rather than replaceable in styles.

Example implementation

The following code example demonstrates how to implement this solution:

<code class="language-xml"><grid>
    <grid.resources>
        <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></code>

This example shows how to apply custom behaviors and triggers to multiple blocks of text in a style, while maintaining correct data binding and message generation.

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