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using System;
using Xamarin.Forms.CustomAttributes;
using System.Threading.Tasks;
#if UITEST
using Xamarin.UITest;
using NUnit.Framework;
#endif
namespace Xamarin.Forms.Controls
{
[Preserve (AllMembers = true)]
[Issue (IssueTracker.Bugzilla, 32898, "Memory leak when TabbedPage is popped out ")]
public class Bugzilla32898 : TestContentPage
{
WeakReference _page2Tracker;
WeakReference _tabTracker;
protected override void Init ()
{
var stack = new StackLayout () { VerticalOptions = LayoutOptions.Center };
stack.Children.Add (new Label () {
VerticalOptions = LayoutOptions.Center,
XAlign = TextAlignment.Center,
Text = "Page 1"
});
Content = stack;
}
protected override async void OnAppearing ()
{
base.OnAppearing ();
if (_page2Tracker == null) {
var page2 = new TabbedPage () { Children = { new ContentPage () { Title = "tab" } } };
page2.Appearing += async delegate {
await Task.Delay (1000);
await page2.Navigation.PopModalAsync ();
};
_page2Tracker = new WeakReference (page2, false);
_tabTracker = new WeakReference (page2.Children [0], false);
await Task.Delay (1000);
await Navigation.PushModalAsync (page2);
StartTrackPage2 ();
}
}
async void StartTrackPage2 ()
{
while (true) {
((Label)((StackLayout)Content).Children [0]).Text =
$"Page1. But Page2 IsAlive = {_page2Tracker.IsAlive}, tab IsAlive = {_tabTracker.IsAlive}";
await Task.Delay (1000);
GC.Collect ();
}
}
#if UITEST
[Test]
public async void Issu32898Test ()
{
await Task.Delay (5000);
RunningApp.WaitForElement (q => q.Marked ("Page1. But Page2 IsAlive = False, tab IsAlive = False"));
}
#endif
}
}
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