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using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;
using System.Collections.ObjectModel;
#if UITEST
using Xamarin.UITest;
using NUnit.Framework;
#endif
namespace Xamarin.Forms.Controls.Issues
{
[Preserve(AllMembers = true)]
[Issue(IssueTracker.Bugzilla, 58645, "[iOS] NRE Thrown When ListView Items Are Replaced By Items With a Different Template", PlatformAffected.iOS)]
public class Bugzilla58645 : TestContentPage
{
const string ButtonId = "button";
ObservableCollection<string> Items { get; set; }
protected override void Init()
{
Items = new ObservableCollection<string> { "Item 1A", "Item 2A", "Item 3A" };
var myListView = new ListView
{
HasUnevenRows = true,
ItemsSource = Items,
ItemTemplate = new LayoutTemplateSelector
{
LayoutA = new DataTemplate(typeof(LayoutA)),
LayoutB = new DataTemplate(typeof(LayoutB))
}
};
var switchBtn = new Button
{
Text = "Switch Items",
AutomationId = ButtonId,
Command = new Command(() =>
{
Items.Clear();
Items.Add("Item 1B");
})
};
Content = new StackLayout
{
Children =
{
new Label { Text = "Tap the 'Switch Items' button. If the app does not crash, this test has passed." },
switchBtn,
myListView
}
};
}
public class LayoutA : ViewCell
{
public LayoutA()
{
var layout = new Grid
{
Padding = new Thickness(14),
ColumnDefinitions =
{
new ColumnDefinition { Width = GridLength.Auto },
new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) }
},
RowDefinitions =
{
new RowDefinition { Height = GridLength.Auto }
}
};
var mainLabel = new Label();
mainLabel.SetBinding(Label.TextProperty, ".");
var sw = new Switch();
layout.Children.Add(mainLabel, 0, 0);
layout.Children.Add(sw, 2, 0);
View = layout;
}
}
public class LayoutB : ViewCell
{
public LayoutB()
{
var layout = new Grid
{
Padding = new Thickness(14),
ColumnDefinitions =
{
new ColumnDefinition { Width = GridLength.Auto },
new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) }
},
RowDefinitions =
{
new RowDefinition { Height = GridLength.Auto }
}
};
var mainLabel = new Label();
mainLabel.SetBinding(Label.TextProperty, ".");
var secondLabel = new Label
{
Text = "B"
};
layout.Children.Add(mainLabel, 0, 0);
layout.Children.Add(secondLabel, 2, 0);
View = layout;
}
}
public class LayoutTemplateSelector : DataTemplateSelector
{
public DataTemplate LayoutA { get; set; }
public DataTemplate LayoutB { get; set; }
protected override DataTemplate OnSelectTemplate(object item, BindableObject container)
{
if (item == null)
return LayoutA;
var text = (string)item;
return text.Contains("A") ? LayoutA : LayoutB;
}
}
#if UITEST
[Test]
public void Bugzilla58645Test()
{
RunningApp.WaitForElement(q => q.Marked(ButtonId));
RunningApp.Tap(q => q.Marked(ButtonId));
}
#endif
}
}
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