程式 . 生活 . D小調

using System.Windows;
using System.Windows.Interactivity;
using System.Windows.Media.Effects;

namespace BehaviorLib
{
public class BlurBehavior : Behavior<DependencyObject>
{
//預設一個BlurEffect
BlurEffect effect = null;

//預設一個模糊程度為10
public double _BlurRadius = 10;

//開一個Property 做Binding
public double BlurRadius
{
get { return _BlurRadius; }

set
{
_BlurRadius = value;
this.effect.Radius = value;
}
}

//Ctor
public BlurBehavior()
{
effect = new BlurEffect();
effect.Radius = BlurRadius;

}


protected override void OnAttached()
{
base.OnAttached();

//加入滑鼠移入以及移出事件
(this.AssociatedObject as UIElement).MouseEnter += MessageBehavior_MouseEnter;
(this.AssociatedObject as UIElement).MouseLeave += MessageBehavior_MouseLeave;
}



void MessageBehavior_MouseLeave(object sender, System.Windows.Input.MouseEventArgs e)
{
//移除該作用的元件特效
(this.AssociatedObject as UIElement).Effect = null;
}

void MessageBehavior_MouseEnter(object sender, System.Windows.Input.MouseEventArgs e)
{
//套入特效
(this.AssociatedObject as UIElement).Effect = effect;
}



protected override void OnDetaching()
{
base.OnDetaching();
//移除事件
(this.AssociatedObject as UIElement).MouseEnter -= MessageBehavior_MouseEnter;
(this.AssociatedObject as UIElement).MouseLeave -= MessageBehavior_MouseLeave;
}

}
}