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

namespace ShrlAlgoToolkit.Mvvm.Converters;

public class ComparisonConverter : IValueConverter
{
    /// <summary>
    /// Model属性->Control属性
    /// </summary>
    /// <param name="value"></param>
    /// <param name="targetType"></param>
    /// <param name="parameter"></param>
    /// <param name="culture"></param>
    /// <returns></returns>
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        //value:ViewModel属性，枚举/数字/字符串
        //parameter：ConverterParameter，枚举/数字/字符串
        //return (string)parameter == (string)value;
        //绑定的枚举属性与控件转换参数一致则选中
        return value.Equals(parameter);
        //return (string)parameter == (string)value;
    }

    /// <summary>
    /// 控件选中，将Converter参数传给模型属性
    /// </summary>
    /// <param name="value"></param>
    /// <param name="targetType"></param>
    /// <param name="parameter"></param>
    /// <param name="culture"></param>
    /// <returns></returns>
    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        //value:bool 比如RadioButton的check属性
        //parameter:ConverterParameter枚举
        //一样才传递给ViewModel
        //选中则返回枚举类
        return value is true ? parameter : Binding.DoNothing;
        //return (bool)value ? parameter : Binding.DoNothing;
    }
}