///////////////////////////////////////////////////////////////////////////////
//Copyright (c) 2016, 北京探索者软件公司
//All rights reserved.       
//文件名称: ValueCOnvertProxy.cs
//文件描述: 转换器代理
//创 建 者: xls
//创建日期: 2017-1-11
//版 本 号：1.0.0.0
////////////////////////////////////////////////////////////////////////////////

using System;
using System.Windows;
using System.Windows.Data;


namespace FWindSoft.Wpf
{
    public class ValueConvertProxy : Freezable, IValueConverter
    {
        public static readonly DependencyProperty RealConvertProperty = DependencyProperty.Register("RealConvert", typeof(IValueConverter),
          typeof(ValueConvertProxy), new UIPropertyMetadata(null));
        /// <summary>
        /// 真实转换器
        /// </summary>
        public  IValueConverter RealConvert
        {
            get { return (IValueConverter)GetValue(RealConvertProperty); }
            set { SetValue(RealConvertProperty, value); }
        }
        public static readonly DependencyProperty ParameterProperty = DependencyProperty.Register("Parameter", typeof(object),
          typeof(ValueConvertProxy), new UIPropertyMetadata(null));
        /// <summary>
        /// 关联参数
        /// </summary>
        public object Parameter
        {
            get { return (object)GetValue(ParameterProperty); }
            set { SetValue(ParameterProperty, value); }
        }
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (RealConvert == null)
            {
                return value;
                //return targetType.IsValueType ? Activator.CreateInstance(targetType) : null;
            }

            return RealConvert.Convert(value, targetType, Parameter??parameter, culture);

        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (RealConvert == null)
            {
                return value;
                //return targetType.IsValueType ? Activator.CreateInstance(targetType) : null;
            }

            return RealConvert.ConvertBack(value, targetType, Parameter ?? parameter, culture);
        }

        protected override Freezable CreateInstanceCore()
        {
            return new ValueConvertProxy(){RealConvert=this.RealConvert,Parameter=this.Parameter};
        }
    }
}