WPF

How to add behavior from style

• How to add a Blend Behavior in a Style Setter
• Attaching Behaviors from the Expression Blend SDK

using System.Windows;
using System.Windows.Interactivity;

namespace Fab.Client.Framework.Behaviors
{
	/// <summary>
	/// Behaviors that could be added from style.
	/// </summary>
	public class StylizedBehaviors
	{
		#region Fields (public)
		public static readonly DependencyProperty BehaviorsProperty = DependencyProperty.RegisterAttached(
			@"Behaviors",
			typeof(StylizedBehaviorCollection),
			typeof(StylizedBehaviors),
			new FrameworkPropertyMetadata(null, OnPropertyChanged));
		#endregion
		#region Static Methods (public)
		public static StylizedBehaviorCollection GetBehaviors(DependencyObject uie)
		{
			return (StylizedBehaviorCollection)uie.GetValue(BehaviorsProperty);
		}

		public static void SetBehaviors(DependencyObject uie, StylizedBehaviorCollection value)
		{
			uie.SetValue(BehaviorsProperty, value);
		}
		#endregion

		#region Static Methods (private)
		private static void OnPropertyChanged(DependencyObject dpo, DependencyPropertyChangedEventArgs e)
		{
			var uie = dpo as UIElement;

			if (uie == null)
			{
				return;
			}

			BehaviorCollection itemBehaviors = Interaction.GetBehaviors(uie);

			var newBehaviors = e.NewValue as StylizedBehaviorCollection;
			var oldBehaviors = e.OldValue as StylizedBehaviorCollection;

			if (newBehaviors == oldBehaviors)
			{
				return;
			}

			if (oldBehaviors != null)
			{
				foreach (var behavior in oldBehaviors)
				{
					int index = itemBehaviors.IndexOf(behavior);

					if (index >= 0)
					{
						itemBehaviors.RemoveAt(index);
					}
				}
			}

			if (newBehaviors != null)
			{
				foreach (var behavior in newBehaviors)
				{
					int index = itemBehaviors.IndexOf(behavior);

					if (index < 0)
					{
						itemBehaviors.Add(behavior);
					}
				}
			}
		}
		#endregion
	}
}

using System.Windows.Interactivity;

namespace Fab.Client.Framework.Behaviors
{
	/// <summary>
	/// Collection of <see cref="StylizedBehaviors"/>.
	/// </summary>
	public class StylizedBehaviorCollection : FreezableCollection<Behavior>
	{
		#region Methods (protected)
		protected override Freezable CreateInstanceCore()
		{
			return new StylizedBehaviorCollection();
		}
		#endregion
	}
}

xmlns:WPF="clr-namespace:LivingAgile.Common.WPF"

<Style TargetType="{x:Type Button}">
  <Setter Property="WPF:StylizedBehaviors.Behaviors">
    <Setter.Value>
      <WPF:StylizedBehaviorCollection>
        <MyBehaviors:PopOnHoverBehavior />
      </WPF:StylizedBehaviorCollection>
    </Setter.Value>
  </Setter>
</Style>