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using System;
using System.Linq;
using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;
using System.Collections.Generic;
#if UITEST
using Xamarin.UITest;
using NUnit.Framework;
#endif
namespace Xamarin.Forms.Controls
{
[Preserve(AllMembers = true)]
[Issue(IssueTracker.Bugzilla, 42277, "DataTemplate System.InvalidCastException crash in 2.3.1-pre1")]
public class Bugzilla42277 : TestContentPage
{
const string Success1 = "Success1";
const string Success2 = "Success2";
const string Success3 = "GroupedSuccess3";
const string Success4 = "GroupedSuccess4";
const string Success5 = "GroupedSuccess5";
const string Success6 = "GroupedSuccess6";
class MyDataTemplateSelector : DataTemplateSelector
{
DataTemplate _1Template;
DataTemplate _2Template;
DataTemplate _3Template;
DataTemplate _4Template;
DataTemplate _5Template;
DataTemplate _6Template;
public MyDataTemplateSelector()
{
_1Template = new DataTemplate(() =>
{
return new TextCell { Text = Success1 };
});
_2Template = new DataTemplate(() =>
{
return new TextCell { Text = Success2 };
});
_3Template = new DataTemplate(() =>
{
return new TextCell { Text = Success3 };
});
_4Template = new DataTemplate(() =>
{
return new TextCell { Text = Success4 };
});
_5Template = new DataTemplate(() =>
{
return new TextCell { Text = Success5 };
});
_6Template = new DataTemplate(() =>
{
return new TextCell { Text = Success6 };
});
}
protected override DataTemplate OnSelectTemplate(object item, BindableObject container)
{
int number = (int)item;
switch (number)
{
default:
case 0: return _1Template;
case 1: return _2Template;
case 2: return _3Template;
case 3: return _4Template;
case 4: return _5Template;
case 5: return _6Template;
}
}
}
protected override void Init()
{
//test non-grouped DTS
ListView listView = new ListView(ListViewCachingStrategy.RecycleElement)
{
ItemsSource = Enumerable.Range(0, 2),
ItemTemplate = new MyDataTemplateSelector()
};
//test grouped DTS
ListView groupedListView = new ListView(ListViewCachingStrategy.RecycleElement)
{
ItemsSource = new List<List<int>> { Enumerable.Range(2, 2).ToList(), Enumerable.Range(4, 2).ToList() },
IsGroupingEnabled = true,
ItemTemplate = new MyDataTemplateSelector()
};
Content = new StackLayout { Children = { listView, groupedListView } };
//test collection changed
listView.ItemsSource = Enumerable.Range(0, 2);
groupedListView.ItemsSource = new List<List<int>> { Enumerable.Range(2, 2).ToList(), Enumerable.Range(4, 2).ToList() };
}
#if UITEST
[Test]
public void Bugzilla42277Test()
{
RunningApp.WaitForElement(q => q.Marked(Success1));
RunningApp.WaitForElement(q => q.Marked(Success2));
RunningApp.WaitForElement(q => q.Marked(Success3));
RunningApp.WaitForElement(q => q.Marked(Success4));
RunningApp.WaitForElement(q => q.Marked(Success5));
RunningApp.WaitForElement(q => q.Marked(Success6));
}
#endif
}
}
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