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-rw-r--r--Xamarin.Forms.Controls/ControlGalleryPages/ListViewSelectionColor.cs150
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diff --git a/Xamarin.Forms.Controls/ControlGalleryPages/ListViewSelectionColor.cs b/Xamarin.Forms.Controls/ControlGalleryPages/ListViewSelectionColor.cs
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+++ b/Xamarin.Forms.Controls/ControlGalleryPages/ListViewSelectionColor.cs
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+´╗┐using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Xamarin.Forms.Controls
+{
+ internal sealed class ListViewSelectionColor : ContentPage
+ {
+ [Preserve (AllMembers = true)]
+ internal sealed class GroupHeaderTemplate : ViewCell
+ {
+ public GroupHeaderTemplate ()
+ {
+ var label = new Label { BackgroundColor = Color.Red };
+ label.SetBinding (Label.TextProperty, "Key");
+ View = label;
+ }
+ }
+
+ [Preserve (AllMembers = true)]
+ internal sealed class GroupItemTemplate : ViewCell
+ {
+ public GroupItemTemplate ()
+ {
+ var label = new Label { BackgroundColor = Color.Green };
+ label.SetBinding (Label.TextProperty, "Name");
+ View = label;
+ }
+ }
+
+ [Preserve (AllMembers = true)]
+ internal sealed class ItemTemplate : ViewCell
+ {
+ public ItemTemplate ()
+ {
+ var label = new Label { BackgroundColor = Color.Green };
+ label.SetBinding (Label.TextProperty, "Name");
+ View = label;
+ }
+ }
+
+ [Preserve (AllMembers = true)]
+ internal sealed class Artist
+ {
+ public string Name { get; private set; }
+
+ public Artist (string name)
+ {
+ Name = name;
+ }
+ }
+
+ [Preserve (AllMembers = true)]
+ internal sealed class Grouping<K, T> : ObservableCollection<T>
+ {
+ public K Key { get; private set; }
+
+ public Grouping (K key, IEnumerable<T> values)
+ {
+ Key = key;
+
+ foreach (T value in values) {
+ Items.Add (value);
+ }
+ }
+ }
+
+ Button _swapListButton;
+
+ [Preserve (AllMembers = true)]
+ public ListViewSelectionColor()
+ {
+ Title = "ListView ScrollTo";
+
+ var itemSource = new [] {
+ new { Name = "John Hassel" },
+ new { Name = "Brian Eno" },
+ new { Name = "Rober Fripp" },
+ new { Name = "Edgar Froese" }
+ };
+
+ var groupedItemSource = new List<Grouping<string, Artist>> {
+ new Grouping<string, Artist> ("Prog", new List<Artist> { new Artist ("King Crimson"), new Artist ("Yes"), new Artist ("Rush") }),
+ new Grouping<string, Artist> ("Techno", new List<Artist> { new Artist ("Juan Atkins"), new Artist ("Jeff Mills"), new Artist ("Gerald Donald") } ),
+ new Grouping<string, Artist> ("Pop", new List<Artist> { new Artist ("Japan"), new Artist ("Roxy Music"), new Artist ("Talking Heads") }),
+ };
+
+ var normalList = new ListView {
+ ItemTemplate = new DataTemplate (typeof (ItemTemplate)),
+ ItemsSource = itemSource
+ };
+ var groupedList = new ListView {
+ IsGroupingEnabled = true,
+ GroupHeaderTemplate = new DataTemplate (typeof (GroupHeaderTemplate)),
+ ItemTemplate = new DataTemplate (typeof (GroupItemTemplate)),
+ ItemsSource = groupedItemSource
+ };
+
+ var currentList = normalList;
+ _swapListButton = new Button {
+ Text = "Swap List Type",
+ Command = new Command (() => {
+ if (currentList == normalList) {
+ SetContent (groupedList);
+ currentList = groupedList;
+ } else {
+ SetContent (normalList);
+ currentList = normalList;
+ }
+ })
+ };
+
+ var clear = new Button {
+ Text = "Clear",
+ Command = new Command (() => {
+ currentList.SelectedItem = null;
+ })
+ };
+
+ Content = new StackLayout {
+ Children = {
+ new StackLayout {
+ Orientation = StackOrientation.Horizontal,
+ Children = {
+ _swapListButton,
+ clear
+ }
+ },
+ normalList
+ }
+ };
+
+ }
+
+ void SetContent (ListView list)
+ {
+ Content = new StackLayout {
+ Children = {
+ _swapListButton,
+ list
+ }
+ };
+ }
+
+
+ }
+} \ No newline at end of file