1 files changed, 129 insertions, 0 deletions
diff --git a/Xamarin.Forms.Controls/ControlGalleryPages/AppearingGalleryPage.cs b/Xamarin.Forms.Controls/ControlGalleryPages/AppearingGalleryPage.cs
new file mode 100644
index 00000000..0df2eeb3
--- /dev/null
+++ b/Xamarin.Forms.Controls/ControlGalleryPages/AppearingGalleryPage.cs
@@ -0,0 +1,129 @@
+using System;
+
+using Xamarin.Forms;
+using System.Diagnostics;
+using System.Collections.Generic;
+
+namespace Xamarin.Forms.Controls
+{
+	public class AppearingGalleryPage : ContentPage
+	{
+		const string NavPageTitle = "NavAppearingPage";
+		const string MasterPageTitle = "MasterAppearingPage";
+		const string TabbedPageTitle = "TabbedAppearingPage";
+		const string CarouselPageTitle = "CarouselAppearingPage";
+
+		public AppearingGalleryPage ()
+		{
+			var initalPage = new AppearingPage (1);
+			var initalPage2 = new AppearingPage (2);
+
+			Content = new StackLayout { 
+				Children = {
+					new Button { Text = NavPageTitle, Command = new Command (() => {
+						Application.Current.MainPage = new NavAppearingPage(initalPage);
+						}) 
+					},
+					new Button { Text = MasterPageTitle, Command = new Command (() => {
+						var page = new MasterDetailPage {
+							Title = MasterPageTitle,
+							Master = new ContentPage { Title = "Master", BackgroundColor = Color.Red },
+							Detail =  new NavAppearingPage(initalPage)
+						};
+						SetMainPage (page);
+					})
+					},
+					new Button { Text = TabbedPageTitle, Command = new Command (() => {
+						var page = new TabbedPage {
+							Title = TabbedPageTitle,
+							Children = { initalPage, initalPage2 }
+						};
+						SetMainPage (page);
+					})
+					},
+					new Button { Text =  CarouselPageTitle, Command = new Command (() => {
+						
+						var page = new CarouselPage {
+							Title = CarouselPageTitle,
+							Children = { initalPage, initalPage2 }
+						};
+						SetMainPage (page);
+					})
+					}	
+				}
+			};
+		}
+
+		static void SetMainPage (Page page)
+		{
+			var tracker = new AppearingTracker (page);
+			Application.Current.MainPage = page;
+		}
+
+		class AppearingTracker 
+		{
+			int _isAppearingFired;
+			int _isDisappearingFired;
+
+			public AppearingTracker (Page page)
+			{
+				page.Appearing += (object sender, EventArgs e) => {
+					_isAppearingFired++;
+					App.AppearingMessages.Add ($"Appearing {page.Title}");
+					Debug.WriteLine ($"Appearing {page.Title}");
+				};
+
+				page.Disappearing += (object sender, EventArgs e) => {
+					_isDisappearingFired++;
+					App.AppearingMessages.Add ($"Disappearing {page.Title}");
+					Debug.WriteLine( $"Disappearing {page.Title}");
+				};
+			}
+		}
+
+		class AppearingPage : ContentPage
+		{
+			int _theId;
+			ListView _listMessages;
+			public AppearingPage (int id)
+			{
+				var tracker = new AppearingTracker (this);
+				_listMessages = new ListView ();
+				_theId = id;
+				Title = $"Page {_theId}";
+				Padding = new Thickness (20);
+				Content = new StackLayout {
+					Children = {
+						new Label { Text = $"Hello Appearing {_theId} page" },
+						new Button { Text = "Push new Page", Command = new Command ( async () => { await Navigation.PushAsync( new AppearingPage(2)); }) },
+						new Button { Text = "Pop page", Command = new Command ( async () => { await Navigation.PopAsync(); }) },
+						new Button { Text = "Pop to root", Command = new Command ( async () => { await Navigation.PopToRootAsync(); }) },
+						new Button { Text = "Change Main Page", Command = new Command ( () => { 
+							App.AppearingMessages.Clear();
+							Application.Current.MainPage = new AppearingPage(3); }) 
+						},
+						_listMessages
+					}
+				};
+			}
+			protected override void OnAppearing ()
+			{
+				base.OnAppearing ();
+				Device.StartTimer (new TimeSpan (200), () => {
+					_listMessages.ItemsSource = App.AppearingMessages;
+					return false;
+				});
+			}
+		}
+
+		class NavAppearingPage : NavigationPage
+		{
+			public NavAppearingPage (Page page) : base(page)
+			{
+				Title = NavPageTitle;
+				var tracker = new AppearingTracker (this);
+			}
+		}
+	}
+}
+