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using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;
using System.Collections.ObjectModel;
using System.Collections.Generic;
namespace Xamarin.Forms.Controls.Issues
{
[Preserve(AllMembers = true)]
[Issue(IssueTracker.Bugzilla, 39802, "Gap between ListView cells even if SeparatorVisablity is set to none ", PlatformAffected.iOS)]
public class Bugzilla39802 : TestContentPage // or TestMasterDetailPage, etc ...
{
protected override void Init()
{
BackgroundColor = Color.Yellow;
var list = new ObservableCollection<GroupedData>();
for (int i = 1; i <= 2; i++)
{
var group = new GroupedData { GroupName = $"Group #{i}" };
for (int j = 1; j < 30; j++)
{
var item = new MyItem { Title = $"Item: #{i}-{j}", Color = (j % 2 == 0) ? Color.Blue : Color.Red };
group.Add(item);
}
list.Add(group);
}
ListItems = list;
BindingContext = this;
var lst = new ListView(ListViewCachingStrategy.RecycleElement)
{
BackgroundColor = Color.Transparent,
ItemTemplate = new DataTemplate(typeof(ItemTemplate)),
GroupHeaderTemplate = new DataTemplate(typeof(GroupHeaderTemplate)),
IsGroupingEnabled = true,
GroupDisplayBinding = new Binding(nameof(GroupedData.GroupName)),
GroupShortNameBinding = new Binding(nameof(GroupedData.GroupName)),
};
lst.SeparatorVisibility = SeparatorVisibility.None;
lst.SeparatorColor = Color.Green;
lst.SetBinding(ListView.ItemsSourceProperty, nameof(ListItems));
Content = lst;
}
public class ItemTemplate : ViewCell
{
public ItemTemplate()
{
var stk = new StackLayout
{
Padding = new Thickness(15, 0, 0, 0)
};
stk.SetBinding(VisualElement.BackgroundColorProperty, nameof(MyItem.Color));
var lbl = new Label
{
TextColor = Color.Yellow,
VerticalOptions = LayoutOptions.CenterAndExpand
};
lbl.SetBinding(Label.TextProperty, nameof(MyItem.Title));
stk.Children.Add(lbl);
View = stk;
}
}
public class GroupHeaderTemplate : ViewCell
{
public GroupHeaderTemplate()
{
var title = new Label { TextColor = Color.White, FontSize = 16 };
title.SetBinding(Label.TextProperty, new Binding(nameof(GroupedData.GroupName), BindingMode.OneWay));
View = new StackLayout
{
Padding = new Thickness(8, 0),
VerticalOptions = LayoutOptions.StartAndExpand,
BackgroundColor = Color.Pink,
Orientation = StackOrientation.Horizontal,
Children = { title },
};
}
}
public ObservableCollection<GroupedData> ListItems { get; set; }
public class MyItem
{
public string Title { get; set; }
public Color Color { get; set; }
}
[Preserve(AllMembers = true)]
public class GroupedData : List<MyItem>
{
public string GroupName { get; set; }
}
}
}
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