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-rw-r--r--Xamarin.Forms.Controls/ControlGalleryPages/AppearingGalleryPage.cs129
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);
+ }
+ }
+ }
+}
+