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

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using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Markup;
using System.Windows.Media.Animation;
using System.Windows.Threading;

namespace MaterialDesignThemes.Wpf
{
    /// <summary>
    /// Implements a <see cref="Snackbar"/> inspired by the Material Design specs (https://material.google.com/components/snackbars-toasts.html).
    /// </summary>
    [ContentProperty(nameof(Message))]
    public class Snackbar : Control
    {
        private const string ActivateStoryboardName = "ActivateStoryboard";
        private const string DeactivateStoryboardName = "DeactivateStoryboard";

        private Action _messageQueueRegistrationCleanUp = null;

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

        public static readonly DependencyProperty MessageProperty = DependencyProperty.Register(
            nameof(Message), typeof(SnackbarMessage), typeof(Snackbar), new PropertyMetadata(default(SnackbarMessage)));

        public SnackbarMessage Message
        {
            get { return (SnackbarMessage) GetValue(MessageProperty); }
            set { SetValue(MessageProperty, value); }
        }

        public static readonly DependencyProperty MessageQueueProperty = DependencyProperty.Register(
            nameof(MessageQueue), typeof(SnackbarMessageQueue), typeof(Snackbar), new PropertyMetadata(default(SnackbarMessageQueue), MessageQueuePropertyChangedCallback));

        private static void MessageQueuePropertyChangedCallback(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
        {
            var snackbar = (Snackbar) dependencyObject;
            (snackbar._messageQueueRegistrationCleanUp ?? (() => { }))();            
            var messageQueue = dependencyPropertyChangedEventArgs.NewValue as SnackbarMessageQueue;
            snackbar._messageQueueRegistrationCleanUp = messageQueue?.Pair(snackbar);
        }

        public SnackbarMessageQueue MessageQueue
        {
            get { return (SnackbarMessageQueue) GetValue(MessageQueueProperty); }
            set { SetValue(MessageQueueProperty, value); }
        }

        public static readonly DependencyProperty IsActiveProperty = DependencyProperty.Register(
            nameof(IsActive), typeof(bool), typeof(Snackbar), new PropertyMetadata(default(bool), IsActivePropertyChangedCallback));

        public bool IsActive
        {
            get { return (bool) GetValue(IsActiveProperty); }
            set { SetValue(IsActiveProperty, value); }
        }