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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;
using System.Text;
#if UITEST
using Xamarin.Forms.Core.UITests;
using Xamarin.UITest;
using NUnit.Framework;
#endif
namespace Xamarin.Forms.Controls.Issues
{
#if UITEST
[Category(UITestCategories.ListView)]
#endif
[Preserve(AllMembers = true)]
[Issue(IssueTracker.Bugzilla, 40704, "Strange duplication of listview headers when collapsing/expanding sections")]
public class Bugzilla40704 : TestContentPage // or TestMasterDetailPage, etc ...
{
ListView listview;
int count = 2;
protected override void Init()
{
listview = new ListView(ListViewCachingStrategy.RecycleElement)
{
AutomationId = "lstMain",
IsGroupingEnabled = true,
HasUnevenRows = true,
GroupHeaderTemplate = new DataTemplate(typeof(GroupHeaderViewCell)),
ItemTemplate = new DataTemplate(typeof(ItemTestViewCell))
};
FillPatientsList();
var button = new Button()
{
Text = "Collapse",
AutomationId = "btnCollappse"
};
listview.Footer = button;
button.Clicked += Button_Clicked;
Content = listview;
}
void Button_Clicked(object sender, EventArgs e)
{
var source = listview.ItemsSource as List<PatientsGroupViewModel>;
source[count].Toggle();
count--;
if (count < 0)
count = 2;
}
private void FillPatientsList()
{
const int groupsNumber = 3;
const int patientsNumber = 10;
var patientGroups = new List<PatientsGroupViewModel>();
var random = new Random();
for (var i = 0; i < groupsNumber; i++)
{
var patients = new List<PatientViewModel>();
for (var j = 0; j < patientsNumber; j++)
{
var code = string.Format("{0}-{1}", i, j);
var length = random.Next(5, 100);
var strBuilder = new StringBuilder();
for (int z = 0; z < length; z++)
{
strBuilder.Append(code);
if (z % 7 == 0)
{
strBuilder.Append(' ');
}
}
patients.Add(new PatientViewModel(code) { Description = strBuilder.ToString() });
}
patientGroups.Add(new PatientsGroupViewModel(patients)
{
Title = "Menu - " + i.ToString()
});
}
listview.ItemsSource = patientGroups;
}
[Preserve(AllMembers = true)]
public class GroupHeaderViewCell : ViewCell
{
TapGestureRecognizer tapGesture;
public GroupHeaderViewCell()
{
Height = 40;
var grd = new Grid { BackgroundColor = Color.Aqua, Padding = new Thickness(5, 10) };
tapGesture = new TapGestureRecognizer();
tapGesture.Tapped += HeaderCell_OnTapped;
grd.GestureRecognizers.Add(tapGesture);
var lbl = new Label { VerticalOptions = LayoutOptions.Center, HorizontalOptions = LayoutOptions.FillAndExpand, TextColor = Color.Black, FontSize = 16 };
lbl.SetBinding(Label.TextProperty, new Binding("Title"));
grd.Children.Add(lbl);
View = grd;
}
void HeaderCell_OnTapped(object sender, EventArgs e)
{
var cell = (Layout)sender;
var vm = cell.BindingContext as PatientsGroupViewModel;
if (vm != null)
{
vm.Toggle();
}
}
}
[Preserve(AllMembers = true)]
public class ItemTestViewCell : ViewCell
{
public ItemTestViewCell()
{
var grd = new Grid { BackgroundColor = Color.Yellow };
var lbl = new Label { HorizontalOptions = LayoutOptions.FillAndExpand, TextColor = Color.Black, FontSize = 16, LineBreakMode = LineBreakMode.WordWrap };
lbl.SetBinding(Label.TextProperty, new Binding("Description"));
grd.Children.Add(lbl);
View = grd;
}
}
[Preserve(AllMembers = true)]
public class RangeObservableCollection<T> : ObservableCollection<T>
{
private bool _suppressNotification = false;
protected override void OnCollectionChanged(NotifyCollectionChangedEventArgs e)
{
if (!_suppressNotification)
base.OnCollectionChanged(e);
}
public void AddRange(IEnumerable<T> list)
{
if (list == null)
throw new ArgumentNullException("list");
_suppressNotification = true;
foreach (var item in list)
{
Add(item);
}
_suppressNotification = false;
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
}
}
[Preserve(AllMembers = true)]
public class PatientsGroupViewModel : RangeObservableCollection<PatientViewModel>
{
public bool IsCollapsed { get; private set; }
public string Title { get; set; }
private readonly List<PatientViewModel> _patients;
public PatientsGroupViewModel(List<PatientViewModel> patients)
{
_patients = patients;
UpdateCollection();
}
public void Toggle()
{
IsCollapsed = !IsCollapsed;
UpdateCollection();
}
private void UpdateCollection()
{
if (!IsCollapsed)
{
AddRange(_patients);
}
else
{
Clear();
}
}
}
[Preserve(AllMembers = true)]
public class PatientViewModel
{
public PatientViewModel(string code)
{
Code = code;
}
public string Code { get; set; }
public string Description { get; set; }
}
#if UITEST
[Test]
public void Bugzilla40704HeaderPresentTest()
{
RunningApp.WaitForElement("Menu - 0");
}
[Test]
public void Bugzilla40704Test()
{
RunningApp.ScrollDownTo("btnCollappse", "lstMain", ScrollStrategy.Gesture, 0.8, timeout: TimeSpan.FromMinutes(2));
RunningApp.Tap("btnCollappse");
RunningApp.ScrollDownTo("btnCollappse", "lstMain", ScrollStrategy.Gesture, 0.8, timeout: TimeSpan.FromMinutes(2));
RunningApp.Tap("btnCollappse");
RunningApp.ScrollDownTo("btnCollappse", "lstMain", ScrollStrategy.Gesture, 0.8, timeout: TimeSpan.FromMinutes(2));
RunningApp.Tap("btnCollappse");
RunningApp.WaitForElement("Menu - 2");
RunningApp.WaitForElement("Menu - 1");
RunningApp.WaitForElement("Menu - 0");
}
#endif
}
}
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