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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;
namespace Xamarin.Forms.Controls
{
[Preserve (AllMembers = true)]
[Issue (IssueTracker.Bugzilla, 33870, "[W] Crash when the ListView Selection is set to null", PlatformAffected.WinRT)]
public class Bugzilla33870 : TestContentPage
{
public class Section : ObservableCollection<string>
{
public Section (string title, IEnumerable<string> items = null)
: this (items ?? new List<string> ())
{
Title = title;
}
public Section (IEnumerable<string> items)
: base (items)
{ }
public string Title { get; set; }
}
protected override void Init ()
{
var source = new ObservableCollection<Section> {
new Section("SECTION 1") {
"ITEM 1",
"ITEM 2",
},
new Section("SECTION 2") {
"ITEM 3",
"CLEAR SELECTION",
}
};
var listview = new ListView {
ItemsSource = source,
IsGroupingEnabled = true,
GroupDisplayBinding = Binding.Create<Section> (x => x.Title),
};
var label = new Label { Text = "Tap CLEAR SELECTION. If the app does not crash and no item is selected, the test has passed." };
listview.ItemSelected += (sender, args) =>
{
string selecteditem = args.SelectedItem?.ToString ();
label.Text = selecteditem;
if (selecteditem == "CLEAR SELECTION") {
label.Text = "cleared";
((ListView) sender).SelectedItem = null;
}
};
var stack = new StackLayout {
Children = {
label,
listview
}
};
Content = stack;
}
}
}
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