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using System;
using System.Collections.Generic;
using Xamarin.Forms;
using System.Collections.ObjectModel;
using System.Linq;
using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;
#if UITEST
using Xamarin.UITest;
using NUnit.Framework;
#endif
namespace Xamarin.Forms.Controls.Issues
{
[Preserve (AllMembers = true)]
[Issue (IssueTracker.Github, 2777, "When add GroupHeaderTemplate in XAML the group header does not show up")]
public partial class Issue2777 : TestContentPage
{
public Issue2777 ()
{
#if APP
InitializeComponent ();
var list = SetupList ();
itemListView.ItemsSource = list;
#endif
}
protected override void Init ()
{
}
internal void OnItemTapped (object sender, ItemTappedEventArgs ea)
{
var listItem = (ListItemValue)ea.Item;
DisplayAlert (listItem.Name, "You tapped " + listItem.Name, "OK", "Cancel");
}
ObservableCollection<ListItemCollection> SetupList ()
{
var allListItemGroups = new ObservableCollection<ListItemCollection> ();
foreach (var item in ListItemCollection.GetSortedData()) {
// Attempt to find any existing groups where theg group title matches the first char of our ListItem's name.
var listItemGroup = allListItemGroups.FirstOrDefault (g => g.Title == item.Label);
// If the list group does not exist, we create it.
if (listItemGroup == null) {
listItemGroup = new ListItemCollection (item.Label);
listItemGroup.Add (item);
allListItemGroups.Add (listItemGroup);
} else { // If the group does exist, we simply add the demo to the existing group.
listItemGroup.Add (item);
}
}
return allListItemGroups;
}
// Represents a group of items in our list.
[Preserve (AllMembers = true)]
public class ListItemCollection : ObservableCollection<ListItemValue>
{
public string Title { get; private set; }
public string LongTitle { get { return "The letter " + Title; } }
public ListItemCollection (string title)
{
Title = title;
}
public static List<ListItemValue> GetSortedData ()
{
var items = ListItems;
items.Sort ();
return items;
}
// Data used to populate our list.
static readonly List<ListItemValue> ListItems = new List<ListItemValue> () {
new ListItemValue ("Babbage"),
new ListItemValue ("Boole"),
new ListItemValue ("Berners-Lee"),
new ListItemValue ("Atanasoff"),
new ListItemValue ("Allen"),
new ListItemValue ("Cormack"),
new ListItemValue ("Cray"),
new ListItemValue ("Dijkstra"),
new ListItemValue ("Dix"),
new ListItemValue ("Dewey"),
new ListItemValue ("Erdős"),
};
}
// Represents one item in our list.
[Preserve (AllMembers = true)]
public class ListItemValue : IComparable<ListItemValue>
{
public string Name { get; private set; }
public ListItemValue (string name)
{
Name = name;
}
int IComparable<ListItemValue>.CompareTo (ListItemValue value)
{
return Name.CompareTo (value.Name);
}
public string Label {
get {
return Name [0].ToString ();
}
}
}
#if UITEST
[Test]
public void Issue2777Test ()
{
RunningApp.Screenshot ("I am at Issue 2965");
RunningApp.WaitForElement (q => q.Marked ("The letter A"));
}
#endif
}
}
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