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using System;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;
#if UITEST
using NUnit.Framework;
using Xamarin.UITest;
#endif
namespace Xamarin.Forms.Controls
{
[Preserve (AllMembers = true)]
[Issue (IssueTracker.Github, 530, "ListView does not render if source is async", PlatformAffected.iOS)]
public class Issue530 : TestContentPage
{
ListView _list;
Button _button;
protected override void Init ()
{
var dataTemplate = new DataTemplate (typeof (TextCell));
dataTemplate.SetBinding (TextCell.TextProperty, new Binding ("."));
_list = new ListView {
ItemTemplate = dataTemplate
};
_button = new Button {
Text = "Load",
};
_button.Clicked += async (sender, e) => {
await Task.Delay (1000);
_list.ItemsSource = new [] {"John","Paul", "George", "Ringo"};
};
Content = new StackLayout {
Children = {
_button,
_list,
}
};
}
#if UITEST
[Test]
[UiTest (typeof(ListView))]
public void Issue530TestsLoadAsync ()
{
RunningApp.WaitForElement (q => q.Button ("Load"));
RunningApp.Screenshot ("All elements present");
RunningApp.Tap (q => q.Button ("Load"));
RunningApp.WaitForElement (q => q.Marked ("John"));
RunningApp.WaitForElement (q => q.Marked ("Paul"));
RunningApp.WaitForElement (q => q.Marked ("George"));
RunningApp.WaitForElement (q => q.Marked ("Ringo"));
RunningApp.Screenshot ("List items loaded async");
}
#endif
}
}
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