MTP2.0_CSharp/Muchinfo.Common/Fx4.0/Muchinfo.WPF.Controls/Password/PasswordHelper.cs

using System.Windows;
using System.Windows.Controls;

namespace Muchinfo.WPF.Controls.Password
{
    public static class PasswordHelper
    {
        #region Fields

        public static readonly DependencyProperty AttachProperty =
            DependencyProperty.RegisterAttached("Attach", typeof(bool), typeof(PasswordHelper), new PropertyMetadata(false, Attach));
        public static readonly DependencyProperty IsUpdatingProperty =
            DependencyProperty.RegisterAttached("IsUpdating", typeof(bool), typeof(PasswordHelper));
        public static readonly DependencyProperty PasswordProperty =
            DependencyProperty.RegisterAttached("Password", typeof(string), typeof(PasswordHelper), new FrameworkPropertyMetadata(string.Empty,
                OnPasswordPropertyChanged));

        #endregion Fields

        #region Methods

        #region Public Static Methods

        public static bool GetAttach(UIElement element)
        {
            return (bool)element.GetValue(AttachProperty);
        }

        public static bool GetIsUpdating(UIElement element)
        {
            return (bool)element.GetValue(IsUpdatingProperty);
        }

        public static string GetPassword(UIElement element)
        {
            return (string)element.GetValue(PasswordProperty);
        }

        public static void SetAttach(UIElement element, bool value)
        {
            element.SetValue(AttachProperty, value);
        }

        public static void SetIsUpdating(UIElement element, bool value)
        {
            element.SetValue(IsUpdatingProperty, value);
        }

        public static void SetPassword(UIElement element, string value)
        {
            element.SetValue(PasswordProperty, value);
        }

        #endregion Public Static Methods

        #region Private Static Methods

        private static void Attach(DependencyObject sender, DependencyPropertyChangedEventArgs e)
        {
            var passwordBox = sender as PasswordBox;
            if (passwordBox == null) return;
            if ((bool)e.OldValue)
            {
                passwordBox.PasswordChanged -= PasswordChanged;
            }

            if ((bool)e.NewValue)
            {
                passwordBox.PasswordChanged += PasswordChanged;
            }
        }

        private static void OnPasswordPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var passwordBox = d as PasswordBox;
            if (passwordBox == null) return;
            passwordBox.PasswordChanged -= PasswordChanged;
            if (!(bool)GetIsUpdating(passwordBox))
            {
                passwordBox.Password = (string)e.NewValue;
            }
            passwordBox.PasswordChanged += PasswordChanged;
        }

        private static void PasswordChanged(object sender, RoutedEventArgs e)
        {
            var passwordBox = sender as PasswordBox;
            if (passwordBox == null) return;
            SetIsUpdating(passwordBox, true);
            SetPassword(passwordBox, passwordBox.Password);
            SetIsUpdating(passwordBox, false);
        }

        #endregion Private Static Methods

        #endregion Methods
    }
}