silverlight MVVM 附加屬性AttachedBehaviors的實現

原創

2020-02-21 16:22

附加屬性類

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace DTO.SL
{
    /// <summary>
    /// 附加屬性類
    /// </summary>
    public class AttachedBehavior
    {
        public static readonly DependencyProperty BrushProperty = DependencyProperty.RegisterAttached(
            "Brush", typeof(Brush), typeof(AttachedBehavior), new PropertyMetadata(null, new PropertyChangedCallback(OnBrushChanged)));

        /// <summary>
        /// 屬性修改事件
        /// </summary>
        public static void OnBrushChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
        {
            //獲取屬性所在的控件
            TextBlock con = obj as TextBlock;
            //註冊控件事件
            if (con != null)
            {
                con.MouseEnter += new MouseEventHandler(OnControlEnter);
                con.MouseLeave += new MouseEventHandler(OnControlLeave);
            }
        }

        /// <summary>
        /// 獲取屬性的值
        /// </summary>
        /// <param name="boj"></param>
        /// <returns></returns>
        public static Brush GetBrush(DependencyObject boj)
        {
            return (Brush)boj.GetValue(BrushProperty);
        }

        /// <summary>
        /// 設置屬性的值
        /// </summary>
        /// <param name="boj"></param>
        /// <param name="value"></param>
        public static void SetBrush(DependencyObject boj, Brush value)
        {
            boj.SetValue(BrushProperty, value);
        }

        /// <summary>
        /// 鼠標進入事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private static void OnControlEnter(object sender, MouseEventArgs e)
        {
            //獲取當前控件
            TextBlock con = (TextBlock)e.OriginalSource;

            //設置控件顏色爲紅色
            con.Foreground = new SolidColorBrush(Colors.Red);
        }

        /// <summary>
        /// 鼠標離開事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private static void OnControlLeave(object sender, MouseEventArgs e)
        {
            //獲取當前控件
            TextBlock con = (TextBlock)e.OriginalSource;

            //設置控件的顏色爲控件的附加Brush屬性
            con.Foreground = GetBrush(con);
        }
    }
}

Xaml代碼

    xmlns:Custom="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
             xmlns:myConvert="clr-namespace:DTO.SL;assembly=DTO.SL"

            <TextBlock Width="100" Text="GOLD" myConvert:AttachedBehavior.Brush="Gold"></TextBlock>
            <TextBlock Width="100" Text="Violet" myConvert:AttachedBehavior.Brush="Violet"></TextBlock>
            <TextBlock Width="100" Text="LemonChiffon" myConvert:AttachedBehavior.Brush="LemonChiffon"></TextBlock>