packages/MaterialDesignThemes.2.5.1/src/net45/ListSortDirectionIndicator.cs

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

namespace MaterialDesignThemes.Wpf
{
    [TemplateVisualState(GroupName = DirectionGroupName, Name = NoneStateName)]
    [TemplateVisualState(GroupName = DirectionGroupName, Name = AscendingStateName)]
    [TemplateVisualState(GroupName = DirectionGroupName, Name = DescendingStateName)]
    public class ListSortDirectionIndicator : Control
    {
        public const string DirectionGroupName = "Direction";
        public const string NoneStateName = "None";
        public const string AscendingStateName = "Ascending";
        public const string DescendingStateName = "Descending";        

        static ListSortDirectionIndicator()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(ListSortDirectionIndicator), new FrameworkPropertyMetadata(typeof(ListSortDirectionIndicator)));
        }

        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();

            GotoVisualState(true, ListSortDirection);
        }


        public static readonly DependencyProperty ListSortDirectionProperty = DependencyProperty.Register(
            nameof(ListSortDirection), typeof (ListSortDirection?), typeof (ListSortDirectionIndicator), new PropertyMetadata(default(ListSortDirection?), ListSortDirectionPropertyChangedCallback));

        private static void ListSortDirectionPropertyChangedCallback(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
        {
            var indicator = (ListSortDirectionIndicator) dependencyObject;
            indicator.GotoVisualState(true, indicator.ListSortDirection);
            indicator.IsNeutral = !indicator.ListSortDirection.HasValue;
        }

        public ListSortDirection? ListSortDirection
        {
            get { return (ListSortDirection?) GetValue(ListSortDirectionProperty); }
            set { SetValue(ListSortDirectionProperty, value); }
        }

        private static readonly DependencyPropertyKey IsNeutralPropertyKey =
            DependencyProperty.RegisterReadOnly(
                "IsNeutral", typeof (bool), typeof (ListSortDirectionIndicator),
                new PropertyMetadata(true));

        public static readonly DependencyProperty IsNeutralProperty =
            IsNeutralPropertyKey.DependencyProperty;

        public bool IsNeutral
        {
            get { return (bool) GetValue(IsNeutralProperty); }
            private set { SetValue(IsNeutralPropertyKey, value); }
        }

        private void GotoVisualState(bool useTransitions, ListSortDirection? direction)
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