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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;
namespace Xamarin.Forms.Controls
{
[Preserve (AllMembers=true)]
[Issue (IssueTracker.Github, 1400, "Group binding errors", PlatformAffected.Android | PlatformAffected.iOS | PlatformAffected.WinPhone, NavigationBehavior.PushModalAsync)]
public class Issue1400 : ContentPage
{
public static Entry Editfield { get; set; }
public static ListView List { get; set; }
public static List<MyGroup> Data { get; set; }
public Issue1400 ()
{
Data = new List<MyGroup>();
Data.Add(new MyGroup(){Headertitle = "Header 1"});
Data.First().Add(new MyData(){Title = "title 1"});
Data.First().Add(new MyData() { Title = "title 2" });
Data.Add(new MyGroup() { Headertitle = "Header 2" });
Data.Last().Add(new MyData() { Title = "title 2a" });
Data.Last().Add(new MyData() { Title = "title 2b" });
Editfield = new Entry();
Editfield.HorizontalOptions = LayoutOptions.FillAndExpand;
Editfield.BindingContext = Data.First().First();
Editfield.SetBinding(Entry.TextProperty, "Title");
Editfield.TextChanged += (sender, args) =>
{
AddCell(null);
};
List = new ListView();
List.HorizontalOptions = LayoutOptions.FillAndExpand;
List.VerticalOptions = LayoutOptions.FillAndExpand;
List.BackgroundColor = Color.Yellow;
List.ItemTemplate = new DataTemplate(typeof (VCTest));
List.GroupHeaderTemplate = new DataTemplate(typeof(VCHeader));
List.IsGroupingEnabled = true;
List.ItemsSource = Data;
Content = new StackLayout () {
VerticalOptions = LayoutOptions.StartAndExpand,
HorizontalOptions = LayoutOptions.FillAndExpand,
Children = { Editfield, List },
Padding = new Thickness (10, 10, 10, 10)
};
}
public static List<MyGroup> CopyList(List<MyGroup> data)
{
var newlist = new List<MyGroup>();
foreach (var grp in data)
{
var grpItem = new MyGroup() { Headertitle = grp.Headertitle };
foreach (var subItem in grp)
{
var item = new MyData() { Title = subItem.Title };
grpItem.Add(item);
}
newlist.Add(grpItem);
}
return newlist;
}
public static void AddCell(MyData data)
{
var newlist = CopyList(Data);
// just make some changes
newlist.Last().Add(new MyData() { Title = Editfield.Text });
newlist.Last().RemoveAt(0);
newlist.Last().Add(new MyData() { Title = "2nd "+Editfield.Text });
Data = newlist;
List.ItemsSource = newlist;
}
}
public class MyData : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
string _title;
public const string PropTitle = "Title";
public string Title
{
get { return _title; }
set
{
if (value.Equals(_title, StringComparison.Ordinal)) return;
_title = value;
OnPropertyChanged(new PropertyChangedEventArgs(PropTitle));
}
}
public void OnPropertyChanged(PropertyChangedEventArgs e)
{
if (PropertyChanged != null) PropertyChanged(this, e);
}
}
public class MyGroup : ObservableCollection<MyData>, INotifyPropertyChanged
{
string _headertitle;
public const string PropHeadertitle = "Headertitle";
public string Headertitle
{
get { return _headertitle; }
set
{
if (value.Equals(_headertitle, StringComparison.Ordinal)) return;
_headertitle = value;
OnPropertyChanged( new PropertyChangedEventArgs(PropHeadertitle));
}
}
}
internal class VCTest : ViewCell
{
public VCTest()
{
var label = new Label();
label.SetBinding(Label.TextProperty, "Title");
View = label;
}
}
internal class VCHeader : ViewCell
{
public VCHeader()
{
var label = new Label();
label.SetBinding(Label.TextProperty, "Headertitle");
View = label;
}
}
}
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