using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Windows.Data;
using System.Windows.Media;

using Wpf.Ui.Controls;

namespace Wpf.Ui.Extend.Converters;
public class StringToColorConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return value.ToString();
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        string str = value.ToString();
        Regex regex = new Regex("^#(?:[0-9a-fA-F]{3}){1,2}$");
        if (regex.IsMatch(str))
        {
            var color = ColorConverter.ConvertFromString(str);
            return color;
        }
        
        return Binding.DoNothing;
    }
}
/// <summary>
/// 判断值是否为空
/// </summary>
public class StringIsEmptyConverter : IValueConverter
{
    #region IValueConverter 成员

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return string.IsNullOrEmpty(System.Convert.ToString(value));
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return null;
    }

    #endregion
}