Implement Alerts (Alert, Prompt and ActionSheet)

src/Compatibility/Core/src/WinUI/Forms.cs

@@ -119,9 +119,6 @@ static void SetupInit(
 			{
 				MainWindow = mainWindow;
 
-				//TODO WINUI3
-				Platform.UWP.Platform.SubscribeAlertsAndActionSheets();
-
 				if (mainWindow is WindowsBasePage windowsPage)
 				{
 					windowsPage.LoadApplication(windowsPage.CreateApplication());

src/Controls/samples/Controls.Sample/Pages/Core/AlertsPage.xaml

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<views:BasePage
+    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+    x:Class="Maui.Controls.Sample.Pages.AlertsPage"
+    xmlns:views="clr-namespace:Maui.Controls.Sample.Pages.Base"
+    Title="Alerts">
+    <views:BasePage.Content>
+        <StackLayout
+            Margin="12">
+            <Label
+                Text="Display Alert"
+                Style="{StaticResource Headline}"/>
+            <Button 
+                Text="Alert Simple" 
+                Clicked="OnAlertSimpleClicked" />
+            <Button 
+                Text="Alert Yes/No" 
+                Clicked="OnAlertYesNoClicked" />
+            <Label
+                Text="Display ActionSheet"
+                Style="{StaticResource Headline}"/>
+            <Button 
+                Text="ActionSheet Simple" 
+                Clicked="OnActionSheetSimpleClicked" />
+            <Button 
+                Text="ActionSheet Cancel/Delete" 
+                Clicked="OnActionSheetCancelDeleteClicked" />
+            <Label
+                Text="Display Prompt"
+                Style="{StaticResource Headline}"/>
+            <Button 
+                Text="Question 1"
+                Clicked="OnQuestion1ButtonClicked" />
+            <Label 
+                x:Name="question1ResultLabel" />
+            <Button 
+                Text="Question 2"
+                Clicked="OnQuestion2ButtonClicked" />
+            <Label 
+                x:Name="question2ResultLabel" />
+        </StackLayout>
+    </views:BasePage.Content>
+</views:BasePage>

src/Controls/samples/Controls.Sample/Pages/Core/AlertsPage.xaml.cs

@@ -0,0 +1,58 @@
+using System;
+using System.Diagnostics;
+using Microsoft.Maui;
+
+namespace Maui.Controls.Sample.Pages
+{
+	public partial class AlertsPage
+	{
+		public AlertsPage()
+		{
+			InitializeComponent();
+		}
+
+		async void OnAlertSimpleClicked(object sender, EventArgs e)
+		{
+			await DisplayAlert("Alert", "You have been alerted", "OK");
+		}
+
+		async void OnAlertYesNoClicked(object sender, EventArgs e)
+		{
+			var answer = await DisplayAlert("Question?", "Would you like to play a game", "Yes", "No");
+			Debug.WriteLine("Answer: " + answer);
+		}
+
+		async void OnActionSheetSimpleClicked(object sender, EventArgs e)
+		{
+			var action = await DisplayActionSheet("ActionSheet: Send to?", "Cancel", null, "Email", "Twitter", "Facebook");
+			Debug.WriteLine("Action: " + action);
+		}
+
+		async void OnActionSheetCancelDeleteClicked(object sender, EventArgs e)
+		{
+			var action = await DisplayActionSheet("ActionSheet: SavePhoto?", "Cancel", "Delete", "Photo Roll", "Email");
+			Debug.WriteLine("Action: " + action);
+		}
+
+		async void OnQuestion1ButtonClicked(object sender, EventArgs e)
+		{
+			string result = await DisplayPromptAsync("Question 1", "What's your name?", initialValue: string.Empty);
+
+			if (!string.IsNullOrWhiteSpace(result))
+			{
+				question1ResultLabel.Text = $"Hello {result}.";
+			}
+		}
+
+		async void OnQuestion2ButtonClicked(object sender, EventArgs e)
+		{
+			string result = await DisplayPromptAsync("Question 2", "What's 5 + 5?", initialValue: "10", maxLength: 2, keyboard: Keyboard.Numeric);
+
+			if (!string.IsNullOrWhiteSpace(result))
+			{
+				int number = Convert.ToInt32(result);
+				question2ResultLabel.Text = number == 10 ? "Correct." : "Incorrect.";
+			}
+		}
+	}
+}

src/Controls/samples/Controls.Sample/Pages/TempPage.xaml.cs

@@ -11,10 +11,12 @@ public TempPage()
 			InitializeComponent();
 		}
 
-		void OnButtonClicked(object sender, EventArgs e)
+		async void OnButtonClicked(object sender, EventArgs e)
 		{
 			_counter++;
-			CounterLabel.Text = $"You clicked {_counter} times!";
+			string message = $"You clicked {_counter} times!";
+			CounterLabel.Text = message;
+			await DisplayAlert("Alert", message, "Ok");
 		}
 	}
 }

src/Controls/samples/Controls.Sample/ViewModels/CoreViewModel.cs

@@ -8,7 +8,10 @@ namespace Maui.Controls.Sample.ViewModels
 	public class CoreViewModel : BaseGalleryViewModel
 	{
 		protected override IEnumerable<SectionModel> CreateItems() => new[]
-		{
+		{ 
+			new SectionModel(typeof(AlertsPage), "Alerts",	
+				"Displaying an alert, asking a user to make a choice, or displaying a prompt."),
+
 			new SectionModel(typeof(BrushesPage), "Brushes",
 				"A brush enables you to paint an area, such as the background of a control, using different approaches."),
 

src/Controls/src/Core/HandlerImpl/Window.Android.cs

@@ -1,9 +1,6 @@
 #nullable enable
 
 using System;
-using System.Collections.Generic;
-using System.Text;
-using Android.App;
 using AndroidX.AppCompat.App;
 
 namespace Microsoft.Maui.Controls

src/Controls/src/Core/HandlerImpl/Window.Impl.cs

@@ -23,12 +23,16 @@ public partial class Window : VisualElement, IWindow
 		internal IMauiContext MauiContext => Page?.Handler?.MauiContext
 			?? throw new InvalidOperationException("MauiContext is null");
 
+		internal AlertManager AlertManager { get; }
+
 		internal ModalNavigationService ModalNavigationService { get; }
 
 		public Window()
 		{
 			ModalNavigationService = new ModalNavigationService(this);
 			Navigation = new NavigationImpl(this);
+			AlertManager = new AlertManager(this);
+
 			InternalChildren.CollectionChanged += OnCollectionChanged;
 		}
 
@@ -38,7 +42,6 @@ public Window(Page page)
 			Page = page;
 		}
 
-
 		void SendWindowAppearing()
 		{
 			Page?.SendAppearing();
@@ -80,7 +83,10 @@ public Page? Page
 					InternalChildren.Remove(_page);
 
 					if (_page != null)
+					{
 						_page.AttachedHandler -= OnPageAttachedHandler;
+						_page.DetachedHandler -= OnPageDetachedHandler;
+					}
 				}
 
 				_page = value;
@@ -94,13 +100,23 @@ public Page? Page
 				ModalNavigationService.SettingNewPage();
 
 				if (value != null)
+				{
 					value.AttachedHandler += OnPageAttachedHandler;
+					value.DetachedHandler += OnPageDetachedHandler;
+				}
 			}
 		}
 
 		void OnPageAttachedHandler(object? sender, EventArgs e)
 		{
 			ModalNavigationService.PageAttachedHandler();
+
+			AlertManager.Subscribe();
+		}
+
+		void OnPageDetachedHandler(object? sender, EventArgs e)
+		{
+			AlertManager.Unsubscribe();
 		}
 
 		IView IWindow.View
@@ -149,7 +165,6 @@ void OnModalPushing(Page modalPage)
 			(Parent as Application)?.NotifyOfWindowModalEvent(args);
 		}
 
-
 		void OnPopCanceled()
 		{
 			PopCanceled?.Invoke(this, EventArgs.Empty);

src/Controls/src/Core/HandlerImpl/Window.iOS.cs

@@ -1,9 +1,5 @@
 #nullable enable
 
-using System;
-using System.Collections.Generic;
-using System.Text;
-using Microsoft.Maui.Controls.Platform;
 using UIKit;
 
 namespace Microsoft.Maui.Controls

src/Controls/src/Core/Platform/AlertManager/ActionSheetDialog.Windows.cs

@@ -0,0 +1,147 @@
+#nullable disable
+using System;
+using System.Linq;
+using Microsoft.Maui.Controls.Internals;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+
+namespace Microsoft.Maui.Controls.Platform
+{
+	public sealed class ActionSheetContent : UserControl
+	{
+		readonly ActionSheetArguments _options;
+
+		public event EventHandler OptionSelected;
+
+		public ActionSheetContent(ActionSheetArguments sheetOptions)
+		{
+			Initialize();
+
+			_options = sheetOptions;
+
+			TitleBlock.Text = _options.Title ?? string.Empty;
+			OptionsList.ItemsSource = _options.Buttons.ToList();
+
+			if (_options.FlowDirection == Controls.FlowDirection.RightToLeft)
+			{
+				TitleBlock.FlowDirection = UI.Xaml.FlowDirection.RightToLeft;
+				OptionsList.FlowDirection = UI.Xaml.FlowDirection.RightToLeft;
+			}
+			else if (_options.FlowDirection == Controls.FlowDirection.LeftToRight)
+			{
+				TitleBlock.FlowDirection = UI.Xaml.FlowDirection.LeftToRight;
+				OptionsList.FlowDirection = UI.Xaml.FlowDirection.LeftToRight;
+			}
+
+			if (_options.FlowDirection == Controls.FlowDirection.RightToLeft)
+			{
+				if (_options.Cancel != null)
+				{
+					LeftBtn.Content = _options.Cancel;
+					if (_options.Destruction != null)
+						RightBtn.Content = _options.Destruction;
+				}
+				else if (_options.Destruction != null)
+					LeftBtn.Content = _options.Destruction;
+			}
+			else
+			{
+				if (_options.Cancel != null)
+				{
+					RightBtn.Content = _options.Cancel;
+					if (_options.Destruction != null)
+						LeftBtn.Content = _options.Destruction;
+				}
+				else if (_options.Destruction != null)
+					RightBtn.Content = _options.Destruction;
+			}
+
+			LeftBtn.Visibility = LeftBtn.Content == null ? UI.Xaml.Visibility.Collapsed : UI.Xaml.Visibility.Visible;
+			RightBtn.Visibility = RightBtn.Content == null ? UI.Xaml.Visibility.Collapsed : UI.Xaml.Visibility.Visible;
+		}
+
+		internal TextBlock TitleBlock { get; private set; }
+
+		internal UI.Xaml.Controls.ListView OptionsList { get; private set; }
+
+		internal UI.Xaml.Controls.Button LeftBtn { get; private set; }
+
+		internal UI.Xaml.Controls.Button RightBtn { get; private set; }
+
+		void Initialize()
+		{
+			var mainLayout = new UI.Xaml.Controls.Grid
+			{
+				Padding = new UI.Xaml.Thickness(10),
+				RowDefinitions =
+				{
+					new UI.Xaml.Controls.RowDefinition { Height = new UI.Xaml.GridLength(0, UI.Xaml.GridUnitType.Star) },
+					new UI.Xaml.Controls.RowDefinition { Height = new UI.Xaml.GridLength(0, UI.Xaml.GridUnitType.Auto) }
+				}
+			};
+
+			var firstLayout = new UI.Xaml.Controls.Grid
+			{
+				RowDefinitions =
+				{
+					new UI.Xaml.Controls.RowDefinition { Height = new UI.Xaml.GridLength(0, UI.Xaml.GridUnitType.Auto) },
+					new UI.Xaml.Controls.RowDefinition { Height = new UI.Xaml.GridLength(0, UI.Xaml.GridUnitType.Star) }
+				}
+			};
+
+			TitleBlock = new TextBlock { FontSize = 18, MaxLines = 2 };
+			firstLayout.Children.Add(TitleBlock);
+			UI.Xaml.Controls.Grid.SetRow(TitleBlock, 0);
+
+			OptionsList = new UI.Xaml.Controls.ListView { IsItemClickEnabled = true, Margin = new UI.Xaml.Thickness(0, 10, 0, 10), SelectionMode = UI.Xaml.Controls.ListViewSelectionMode.None };
+			OptionsList.ItemClick += ListItemSelected;
+			firstLayout.Children.Add(OptionsList);
+			UI.Xaml.Controls.Grid.SetRow(OptionsList, 1);
+
+			var secondLayout = new UI.Xaml.Controls.Grid
+			{
+				ColumnDefinitions =
+				{
+					new UI.Xaml.Controls.ColumnDefinition { Width = new UI.Xaml.GridLength(0, UI.Xaml.GridUnitType.Star) },
+					new UI.Xaml.Controls.ColumnDefinition { Width = new UI.Xaml.GridLength(0, UI.Xaml.GridUnitType.Star) }
+				},
+				VerticalAlignment = VerticalAlignment.Bottom
+			};
+
+			LeftBtn = new UI.Xaml.Controls.Button { Height = 32, HorizontalAlignment = HorizontalAlignment.Stretch, Margin = new UI.Xaml.Thickness(0, 0, 5, 0) };
+			LeftBtn.Click += ActionButtonClicked;
+			secondLayout.Children.Add(LeftBtn);
+			UI.Xaml.Controls.Grid.SetColumn(LeftBtn, 0);
+
+			RightBtn = new UI.Xaml.Controls.Button { Height = 32, HorizontalAlignment = HorizontalAlignment.Stretch, Margin = new UI.Xaml.Thickness(5, 0, 0, 0) };
+			RightBtn.Click += ActionButtonClicked;
+			secondLayout.Children.Add(RightBtn);
+			UI.Xaml.Controls.Grid.SetColumn(RightBtn, 1);
+
+			mainLayout.Children.Add(firstLayout);
+			UI.Xaml.Controls.Grid.SetRow(firstLayout, 0);
+
+			mainLayout.Children.Add(secondLayout);
+			UI.Xaml.Controls.Grid.SetRow(secondLayout, 1);
+
+			Content = mainLayout;
+		}
+
+		void ListItemSelected(object sender, ItemClickEventArgs e)
+		{
+			var selection = (string)e.ClickedItem;
+			_options.SetResult(selection);
+
+			OptionSelected?.Invoke(this, null);
+		}
+
+		void ActionButtonClicked(object sender, RoutedEventArgs e)
+		{
+			var button = (UI.Xaml.Controls.Button)sender;
+			var selection = (string)button.Content;
+			_options.SetResult(selection);
+
+			OptionSelected?.Invoke(this, null);
+		}
+	}
+}