using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;

namespace BPASmart.UserManagement.Helper
{
    /// <summary>
    /// 给PasswordBox添加一个可以绑定的附加类
    /// </summary>
    public class PasswordHelper
    {

        static bool IsUpdete = false;

        #region PasswordProperty
        public static readonly DependencyProperty PasswordProperty = DependencyProperty.RegisterAttached("Password", typeof(string),
          typeof(PasswordHelper), new FrameworkPropertyMetadata("", new PropertyChangedCallback(OnPropertyChanged)));


        public static string GetPassword(DependencyObject d)
        {
            return d.GetValue(PasswordProperty).ToString();
        }

        public static void SetPassword(DependencyObject d, string value)
        {
            d.SetValue(PasswordProperty, value);
        }

        private static void OnPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            PasswordBox password = d as PasswordBox;
            password.PasswordChanged -= password_PasswordChanged;
            if (!IsUpdete) password.Password = e.NewValue?.ToString();
            password.PasswordChanged += password_PasswordChanged;
        }
        #endregion

        #region AttachProperty
        public static readonly DependencyProperty AttachProperty = DependencyProperty.RegisterAttached("Attach", typeof(bool),
            typeof(PasswordHelper), new FrameworkPropertyMetadata(default(bool), new PropertyChangedCallback(OnAttachChanged)));

        public static bool GetAttach(DependencyObject d)
        {
            return (bool)d.GetValue(AttachProperty);
        }

        public static void SetAttach(DependencyObject d, bool value)
        {
            d.SetValue(AttachProperty, value);
        }

        private static void OnAttachChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            PasswordBox password = d as PasswordBox;
            password.PasswordChanged += password_PasswordChanged;
        }

        private static void password_PasswordChanged(object sender, RoutedEventArgs e)
        {
            PasswordBox passwordBox = sender as PasswordBox;
            IsUpdete = true;
            SetPassword(passwordBox, passwordBox.Password);
            IsUpdete = false;
        }

        #endregion
    }
}