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

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Data;
using System.Windows.Input;
using System.Windows.Threading;
using MaterialDesignThemes.Wpf.Transitions;

namespace MaterialDesignThemes.Wpf
{
    /// <summary>
    /// Defines how a data context is sourced for a dialog if a <see cref="FrameworkElement"/>
    /// is passed as the command parameter when using <see cref="DialogHost.OpenDialogCommand"/>.
    /// </summary>
    public enum DialogHostOpenDialogCommandDataContextSource
    {
        /// <summary>
        /// The data context from the sender element (typically a <see cref="Button"/>) 
        /// is applied to the content.
        /// </summary>
        SenderElement,
        /// <summary>
        /// The data context from the <see cref="DialogHost"/> is applied to the content.
        /// </summary>
        DialogHostInstance,
        /// <summary>
        /// The data context is explicitly set to <c>null</c>.
        /// </summary>
        None
    }

    [TemplatePart(Name = PopupPartName, Type = typeof(Popup))]
    [TemplatePart(Name = PopupPartName, Type = typeof(ContentControl))]
    [TemplatePart(Name = ContentCoverGridName, Type = typeof(Grid))]
    [TemplateVisualState(GroupName = "PopupStates", Name = OpenStateName)]
    [TemplateVisualState(GroupName = "PopupStates", Name = ClosedStateName)]
    public class DialogHost : ContentControl
    {
        public const string PopupPartName = "PART_Popup";
        public const string PopupContentPartName = "PART_PopupContentElement";
        public const string ContentCoverGridName = "PART_ContentCoverGrid";
        public const string OpenStateName = "Open";
        public const string ClosedStateName = "Closed";

        /// <summary>
        /// Routed command to be used somewhere inside an instance to trigger showing of the dialog. Content can be passed to the dialog via a <see cref="Button.CommandParameter"/>.
        /// </summary>
        public static RoutedCommand OpenDialogCommand = new RoutedCommand();
        /// <summary>
        /// Routed command to be used inside dialog content to close a dialog. Use a <see cref="Button.CommandParameter"/> to indicate the result of the parameter.
        /// </summary>
        public static RoutedCommand CloseDialogCommand = new RoutedCommand();

        private static readonly HashSet<DialogHost> LoadedInstances = new HashSet<DialogHost>();

        private DialogOpenedEventHandler _asyncShowOpenedEventHandler;