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using System;
using System.Collections.Generic;
using System.Diagnostics;
using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;
namespace Xamarin.Forms.Controls.Issues
{
[Preserve(AllMembers = true)]
[Issue(IssueTracker.Bugzilla, 40955, "Memory leak with FormsAppCompatActivity and NavigationPage", PlatformAffected.Android)]
public class Bugzilla40955 : TestMasterDetailPage
{
const string DestructorMessage = "NavigationPageEx Destructor called";
const string Page1Title = "Page1";
const string Page2Title = "Page2";
const string Page3Title = "Page3";
protected override void Init()
{
var masterPage = new MasterPage();
Master = masterPage;
masterPage.ListView.ItemSelected += (sender, e) =>
{
var item = e.SelectedItem as MasterPageItem;
if (item != null)
{
Detail = new NavigationPageEx((Page)Activator.CreateInstance(item.TargetType));
masterPage.ListView.SelectedItem = null;
IsPresented = false;
}
};
Detail = new NavigationPageEx(new _409555_Page1());
}
[Preserve(AllMembers = true)]
public class MasterPageItem
{
public string IconSource { get; set; }
public Type TargetType { get; set; }
public string Title { get; set; }
}
[Preserve(AllMembers = true)]
public class MasterPage : ContentPage
{
public MasterPage()
{
Title = "Menu";
ListView = new ListView { VerticalOptions = LayoutOptions.FillAndExpand, SeparatorVisibility = SeparatorVisibility.None };
ListView.ItemTemplate = new DataTemplate(() =>
{
var ic = new ImageCell();
ic.SetBinding(TextCell.TextProperty, "Title");
return ic;
});
Content = new StackLayout
{
Children = { ListView }
};
var masterPageItems = new List<MasterPageItem>();
masterPageItems.Add(new MasterPageItem
{
Title = Page1Title,
TargetType = typeof(_409555_Page1)
});
masterPageItems.Add(new MasterPageItem
{
Title = Page2Title,
TargetType = typeof(_409555_Page2)
});
masterPageItems.Add(new MasterPageItem
{
Title = Page3Title,
TargetType = typeof(_409555_Page3)
});
ListView.ItemsSource = masterPageItems;
}
public ListView ListView { get; }
}
[Preserve(AllMembers = true)]
public class NavigationPageEx : NavigationPage
{
public NavigationPageEx(Page root) : base(root)
{
}
~NavigationPageEx()
{
Debug.WriteLine(DestructorMessage);
}
}
[Preserve(AllMembers = true)]
public class _409555_Page1 : ContentPage
{
public _409555_Page1()
{
Title = Page1Title;
Content = new StackLayout { Children = { new Label { Text = "Open the drawer menu and select Page2" } } };
}
}
[Preserve(AllMembers = true)]
public class _409555_Page2 : ContentPage
{
public _409555_Page2()
{
Title = Page2Title;
Content = new StackLayout { Children = { new Label { Text = "Open the drawer menu and select Page3" } } };
}
}
[Preserve(AllMembers = true)]
public class _409555_Page3 : ContentPage
{
public _409555_Page3()
{
Title = Page3Title;
Content = new StackLayout { Children = { new Label { Text = $"The console should have displayed the text '{DestructorMessage}' at least once. If not, this test has failed." } } };
}
protected override void OnAppearing()
{
base.OnAppearing();
GC.Collect();
GC.Collect();
GC.Collect();
}
}
}
}
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