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

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using System;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;

namespace MaterialDesignThemes.Wpf
{
    /// <summary>
    /// Helper extensions for showing dialogs.
    /// </summary>
    public static class DialogHostEx
    {
        /// <summary>
        /// Shows a dialog using the first found <see cref="DialogHost"/> in a given <see cref="Window"/>.
        /// </summary>
        /// <param name="window">Window on which the modal dialog should be displayed. Must contain a <see cref="DialogHost"/>.</param>
        /// <param name="content"></param>
        /// <exception cref="InvalidOperationException">
        /// Thrown is a <see cref="DialogHost"/> is not found when conducting a depth first traversal of visual tree.  
        /// </exception>
        /// <remarks>
        /// As a depth first traversal of the window's visual tree is performed, it is not safe to use this method in a situtation where a screen has multiple <see cref="DialogHost"/>s.
        /// </remarks>
        /// <returns></returns>
        public static async Task<object> ShowDialog(this Window window, object content)
        {
            return await GetFirstDialogHost(window).ShowInternal(content, null, null);
        }

        /// <summary>
        /// Shows a dialog using the first found <see cref="DialogHost"/> in a given <see cref="Window"/>.
        /// </summary>
        /// <param name="window">Window on which the modal dialog should be displayed. Must contain a <see cref="DialogHost"/>.</param>
        /// <param name="content">Content to show (can be a control or view model).</param>
        /// <param name="openedEventHandler">Allows access to opened event which would otherwise have been subscribed to on a instance.</param>
        /// <exception cref="InvalidOperationException">
        /// Thrown is a <see cref="DialogHost"/> is not found when conducting a depth first traversal of visual tree.  
        /// </exception>
        /// <remarks>
        /// As a depth first traversal of the window's visual tree is performed, it is not safe to use this method in a situtation where a screen has multiple <see cref="DialogHost"/>s.
        /// </remarks>
        /// <returns></returns>
        public static async Task<object> ShowDialog(this Window window, object content, DialogOpenedEventHandler openedEventHandler)
        {
            return await GetFirstDialogHost(window).ShowInternal(content, openedEventHandler, null);
        }

        /// <summary>
        /// Shows a dialog using the first found <see cref="DialogHost"/> in a given <see cref="Window"/>.
        /// </summary>
        /// <param name="window">Window on which the modal dialog should be displayed. Must contain a <see cref="DialogHost"/>.</param>
        /// <param name="content">Content to show (can be a control or view model).</param>
        /// <param name="closingEventHandler">Allows access to closing event which would otherwise have been subscribed to on a instance.</param>
        /// <exception cref="InvalidOperationException">
        /// Thrown is a <see cref="DialogHost"/> is not found when conducting a depth first traversal of visual tree.  
        /// </exception>
        /// <remarks>
        /// As a depth first traversal of the window's visual tree is performed, it is not safe to use this method in a situtation where a screen has multiple <see cref="DialogHost"/>s.
        /// </remarks>
        /// <returns></returns>
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