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using System;
using Xamarin.Forms.Controls.Issues;
using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;
namespace Xamarin.Forms.Controls
{
[Preserve(AllMembers = true)]
[Issue(IssueTracker.Bugzilla, 42069, "Garbage Collector can not collect pages that use ImageSource as a StaticResource",
PlatformAffected.All)]
public class Bugzilla42069 : TestNavigationPage
{
protected override void Init()
{
if (Application.Current.Resources == null)
{
Application.Current.Resources = new ResourceDictionary();
}
if (!Application.Current.Resources.ContainsKey("SomeSmallImage"))
{
ImageSource smallImage;
switch (Device.RuntimePlatform) {
default:
smallImage = "coffee.png";
break;
case Device.WinPhone:
case Device.Windows:
smallImage = "bank.png";
break;
}
Application.Current.Resources.Add("SomeSmallImage", smallImage);
}
const string instructions1 = @"Tap the Start button and follow the instructions on the next page.";
string instructions2 =
$"When you return to this page, tap the Collect button. The message \n'{Bugzilla42069_Page.DestructorMessage}'\n should appear at least once in the debug output.";
var label1 = new Label { Text = instructions1 };
var label2 = new Label { Text = instructions2, HorizontalTextAlignment = TextAlignment.Center };
var startButton = new Button { Text = "Start" };
startButton.Clicked += (sender, args) =>
{
// We have to do the push-pop-push dance because NavigationPage
// holds a reference to its last page for unrelated reasons; our concern
// here is that the first Bugzilla42069_Page that we pushed gets collected
PushAsync(new Bugzilla42069_Page(), false);
PopAsync(false);
PushAsync(new Bugzilla42069_Page(), false);
};
var collectButton = new Button { Text = "Collect" };
collectButton.Clicked += (sender, args) =>
{
GC.Collect();
GC.Collect();
GC.Collect();
};
var startPage = new ContentPage
{
Content = new StackLayout
{
Children =
{
label1,
startButton,
label2,
collectButton
}
}
};
PushAsync(startPage);
}
}
}
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