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-rw-r--r--Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla35472.cs88
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diff --git a/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla35472.cs b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla35472.cs
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index 00000000..1513463c
--- /dev/null
+++ b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla35472.cs
@@ -0,0 +1,88 @@
+using System;
+using System.Diagnostics;
+using Xamarin.Forms.CustomAttributes;
+#if UITEST
+using Xamarin.Forms.Core.UITests;
+using NUnit.Framework;
+using Xamarin.UITest;
+
+#endif
+
+namespace Xamarin.Forms.Controls
+{
+ [Preserve (AllMembers = true)]
+ [Issue (IssueTracker.Bugzilla, 35472, "PopAsync during ScrollToAsync throws NullReferenceException")]
+ public class Bugzilla35472 : TestNavigationPage
+ {
+ protected override void Init ()
+ {
+ // Set up the scroll viewer page
+ var scrollToButton = new Button () { Text = "Now push this button" };
+
+ var stackLayout = new StackLayout ();
+
+ stackLayout.Children.Add (scrollToButton);
+
+ for (int n = 0; n < 100; n++) {
+ stackLayout.Children.Add (new Label () { Text = n.ToString () });
+ }
+
+ var scrollView = new ScrollView () {
+ Content = stackLayout
+ };
+
+ var pageWithScrollView = new ContentPage () {
+ Content = scrollView
+ };
+
+ // Set up the start page
+ var goButton = new Button () {
+ Text = "Push this button"
+ };
+
+ var successLabel = new Label () { Text = "The test has passed", IsVisible = false };
+
+ var startPage = new ContentPage () {
+ Content = new StackLayout {
+ VerticalOptions = LayoutOptions.Center,
+ Children = {
+ goButton,
+ successLabel
+ }
+ }
+ };
+
+ PushAsync (startPage);
+
+ goButton.Clicked += (sender, args) => Navigation.PushAsync (pageWithScrollView);
+
+ scrollToButton.Clicked += async (sender, args) => {
+ try {
+ // Deliberately not awaited so we can simulate a user navigating back
+ scrollView.ScrollToAsync (0, 1500, true);
+ await Navigation.PopAsync ();
+ successLabel.IsVisible = true;
+ } catch (Exception ex) {
+ Debug.WriteLine (ex);
+ }
+ };
+ }
+
+#if UITEST
+ [Test]
+ [UiTest (typeof(NavigationPage))]
+ public void Issue35472PopAsyncDuringAnimatedScrollToAsync ()
+ {
+ RunningApp.WaitForElement (q => q.Marked ("Push this button"));
+ RunningApp.Tap (q => q.Marked ("Push this button"));
+
+ RunningApp.WaitForElement (q => q.Marked ("Now push this button"));
+ RunningApp.Screenshot ("On Page With ScrollView");
+ RunningApp.Tap (q => q.Marked ("Now push this button"));
+
+ RunningApp.WaitForElement ("The test has passed");
+ RunningApp.Screenshot ("Success");
+ }
+#endif
+ }
+} \ No newline at end of file