程式 . 生活 . D小調

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Windows.Interactivity;
//using Microsoft.Expression.Interactivity.Core;

namespace BehaviorLib
{
    public class MouseOpacity : Behavior<DependencyObject>
    {
        public MouseOpacity()
        {
            // Insert code required on object creation below this point.

            //
            // The line of code below sets up the relationship between the command and the function
            // to call. Uncomment the below line and add a reference to Microsoft.Expression.Interactions
            // if you choose to use the commented out version of MyFunction and MyCommand instead of
            // creating your own implementation.
            //
            // The documentation will provide you with an example of a simple command implementation
            // you can use instead of using ActionCommand and referencing the Interactions assembly.
            //
            //this.MyCommand = new ActionCommand(this.MyFunction);
        }

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

            // Insert code that you would want run when the Behavior is attached to an object.
        }

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

            // Insert code that you would want run when the Behavior is removed from an object.
        }

        /*
        public ICommand MyCommand
        {
            get;
            private set;
        }
         
        private void MyFunction()
        {
            // Insert code that defines what the behavior will do when invoked.
        }
        */
    }
}

using System.Windows;
using System.Windows.Input;
using System.Windows.Interactivity;
//using Microsoft.Expression.Interactivity.Core;

namespace BehaviorLib
{
    public class MouseOpacity : Behavior<DependencyObject>
    {
        public MouseOpacity()
        {
            
        }

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

            //將被Behavior附身的物件 加入滑鼠進入事件
            (this.AssociatedObject as UIElement).MouseEnter += MouseOpacity_MouseEnter;
            //將被Behavior附身的物件 加入滑鼠移出事件
            (this.AssociatedObject as UIElement).MouseLeave += MouseOpacity_MouseLeave;
        }

        void MouseOpacity_MouseLeave(object sender, MouseEventArgs e)
        {
            //設定透明度為1.0
            (sender as UIElement).Opacity = 1.0; 
        }

        void MouseOpacity_MouseEnter(object sender, MouseEventArgs e)
        {
            //設定透明度為0.5
            (sender as UIElement).Opacity = 0.5; 
        }

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

            //移除事件
            (this.AssociatedObject as UIElement).MouseEnter -= MouseOpacity_MouseEnter;
            //移除事件
            (this.AssociatedObject as UIElement).MouseLeave -= MouseOpacity_MouseLeave;
        }

        
    }
}

<UserControl
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity" xmlns:BehaviorLib="clr-namespace:BehaviorLib;assembly=BehaviorLib"
    x:Class="EZBehaviorMemo.MainPage"
    Width="640" Height="480">

    <Grid x:Name="LayoutRoot" Background="White">
        <Image Margin="94,35,316,96" Source="anne-hathaway.jpg" Stretch="Fill">
            <i:Interaction.Behaviors>
                <BehaviorLib:MouseOpacity/>
            </i:Interaction.Behaviors>
        </Image>
    </Grid>
</UserControl>