Rudi Grobler

I am fortunate to be presenting a session about Expression Blend at Tech-ed Africa 2009  this year. One of the topics I will be covering is how easy it is to create behaviours, triggers and actions using Microsoft.Expression.Interactivity.dll!

Behaviours, triggers and actions is well encapsulated but still require a small amount of repetitive code… I created 3 snippets to aid in creating them! Here is the default implementations created using the snippets:

Behavior

/// <summary>
/// 
/// </summary>
public class MyBehavior : Behavior<FrameworkElement>
{
    /// <summary>
    /// 
    /// </summary>
    protected override void OnAttached()
    {
        base.OnAttached();
    }

    /// <summary>
    /// 
    /// </summary>
    protected override void OnDetaching()
    {
        base.OnDetaching();
    }
}

Trigger

/// <summary>
/// 
/// </summary>
public class MyTrigger : TriggerBase<FrameworkElement>
{
    /// <summary>
    /// 
    /// </summary>
    protected override void OnAttached()
    {
        base.OnAttached();
    }

    /// <summary>
    /// 
    /// </summary>
    protected override void OnDetaching()
    {
        base.OnDetaching();
    }
}

Action

/// <summary>
/// 
/// </summary>
public class MyAction : TriggerAction<FrameworkElement>
{
    /// <summary>
    /// 
    /// </summary>
    protected override void OnAttached()
    {
        base.OnAttached();
    }

    /// <summary>
    /// 
    /// </summary>
    protected override void OnDetaching()
    {
        base.OnDetaching();
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="parameter"></param>
    protected override void Invoke(object parameter)
    {

    }
}

Download the snippets here

More Information

• Blend 3- Triggers, Actions, Behaviors by Christian Schormann
• An Introduction to Behaviors, Triggers, and Actions by Jeff Kelly
• Expression Blend 3: More on Actions, Triggers, Behaviors by Mike Taulty

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