From e0b48e11f6a83884f833731877fdb46834e6aa02 Mon Sep 17 00:00:00 2001
From: xiaoy312 <xiaoyao312@gmail.com>
Date: Wed, 22 Feb 2023 08:40:08 -0500
Subject: [PATCH] fix(ListView): ios lv snap rubber-banding

---
 .../UITests.Shared/UITests.Shared.projitems   |  9 +-
 .../ListView/ListView_Snap_Rubberband.xaml    | 98 +++++++++++++++++++
 .../ListView/ListView_Snap_Rubberband.xaml.cs | 35 +++++++
 .../Controls/ScrollViewer/ScrollViewer.cs     |  1 +
 4 files changed, 142 insertions(+), 1 deletion(-)
 create mode 100644 src/SamplesApp/UITests.Shared/Windows_UI_Xaml_Controls/ListView/ListView_Snap_Rubberband.xaml
 create mode 100644 src/SamplesApp/UITests.Shared/Windows_UI_Xaml_Controls/ListView/ListView_Snap_Rubberband.xaml.cs

diff --git a/src/SamplesApp/UITests.Shared/UITests.Shared.projitems b/src/SamplesApp/UITests.Shared/UITests.Shared.projitems
index c7fdb2ec8d01..9c6624bd5d07 100644
--- a/src/SamplesApp/UITests.Shared/UITests.Shared.projitems
+++ b/src/SamplesApp/UITests.Shared/UITests.Shared.projitems
@@ -1558,6 +1558,10 @@
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
+    <Page Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\ListView\ListView_Snap_Rubberband.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
     <Page Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\PasswordBoxTests\PasswordBox_AutoFill.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
@@ -5532,6 +5536,9 @@
     <Compile Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\ImageTests\Image_Source_Nullify.xaml.cs">
       <DependentUpon>Image_Source_Nullify.xaml</DependentUpon>
     </Compile>
+    <Compile Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\ListView\ListView_Snap_Rubberband.xaml.cs">
+      <DependentUpon>ListView_Snap_Rubberband.xaml</DependentUpon>
+    </Compile>
     <Compile Include="$(MSBuildThisFileDirectory)Windows_UI_Xaml_Controls\TextBox\TextBox_PlaceholderForeground.xaml.cs">
       <DependentUpon>TextBox_PlaceholderForeground.xaml</DependentUpon>
     </Compile>
@@ -8842,4 +8849,4 @@
     <Content Include="$(MSBuildThisFileDirectory)Assets\libre-camera-panorama.svg" />
   </ItemGroup>
   <Import Project="ItemExclusions.props" />
-</Project>
\ No newline at end of file
+</Project>
diff --git a/src/SamplesApp/UITests.Shared/Windows_UI_Xaml_Controls/ListView/ListView_Snap_Rubberband.xaml b/src/SamplesApp/UITests.Shared/Windows_UI_Xaml_Controls/ListView/ListView_Snap_Rubberband.xaml
new file mode 100644
index 000000000000..33849c1744fc
--- /dev/null
+++ b/src/SamplesApp/UITests.Shared/Windows_UI_Xaml_Controls/ListView/ListView_Snap_Rubberband.xaml
@@ -0,0 +1,98 @@
+<UserControl x:Class="SamplesApp.Windows_UI_Xaml_Controls.ListView.ListView_Snap_Rubberband"
+	  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+	  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+	  xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+	  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+	  xmlns:xamarin="http://uno.ui/xamarin"
+	  mc:Ignorable="d xamarin"
+	  Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+
+	<UserControl.Resources>
+		<Style x:Key="TestHorizontalLVStyle" TargetType="ListView">
+			<Setter Property="IsTabStop" Value="False" />
+			<Setter Property="TabNavigation" Value="Once" />
+			<Setter Property="IsSwipeEnabled" Value="True" />
+			<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Visible" />
+			<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Disabled" />
+			<Setter Property="ScrollViewer.HorizontalScrollMode" Value="Enabled" />
+			<Setter Property="ScrollViewer.VerticalScrollMode" Value="Disabled" />
+			<Setter Property="ScrollViewer.IsHorizontalRailEnabled" Value="True" />
+			<Setter Property="ScrollViewer.IsVerticalRailEnabled" Value="False" />
+			<Setter Property="ScrollViewer.IsDeferredScrollingEnabled" Value="False" />
+			<Setter Property="ScrollViewer.BringIntoViewOnFocusChange" Value="True" />
+			<Setter Property="ItemContainerTransitions">
+				<Setter.Value>
+					<TransitionCollection>
+						<AddDeleteThemeTransition />
+						<ContentThemeTransition />
+						<ReorderThemeTransition />
+						<EntranceThemeTransition IsStaggeringEnabled="False" />
+					</TransitionCollection>
+				</Setter.Value>
+			</Setter>
+
+			<Setter Property="ItemsPanel">
+				<Setter.Value>
+					<ItemsPanelTemplate>
+						<ItemsStackPanel Orientation="Horizontal" />
+					</ItemsPanelTemplate>
+				</Setter.Value>
+			</Setter>
+			<Setter Property="Template">
+				<Setter.Value>
+					<ControlTemplate TargetType="ListView">
+						<ScrollViewer x:Name="ScrollViewer"
+										xamarin:Style="{StaticResource ListViewBaseScrollViewerStyle}"
+										HorizontalScrollMode="{TemplateBinding ScrollViewer.HorizontalScrollMode}"
+										HorizontalScrollBarVisibility="{TemplateBinding ScrollViewer.HorizontalScrollBarVisibility}"
+										VerticalScrollMode="{TemplateBinding ScrollViewer.VerticalScrollMode}"
+										VerticalScrollBarVisibility="{TemplateBinding ScrollViewer.VerticalScrollBarVisibility}"
+										IsHorizontalScrollChainingEnabled="{TemplateBinding ScrollViewer.IsHorizontalScrollChainingEnabled}"
+										IsHorizontalRailEnabled="{TemplateBinding ScrollViewer.IsHorizontalRailEnabled}"
+										IsVerticalScrollChainingEnabled="{TemplateBinding ScrollViewer.IsVerticalScrollChainingEnabled}"
+										IsVerticalRailEnabled="{TemplateBinding ScrollViewer.IsVerticalRailEnabled}"
+										IsDeferredScrollingEnabled="{TemplateBinding ScrollViewer.IsDeferredScrollingEnabled}"
+										BringIntoViewOnFocusChange="{TemplateBinding ScrollViewer.BringIntoViewOnFocusChange}"
+										AutomationProperties.AccessibilityView="Raw"
+										HorizontalSnapPointsType="MandatorySingle"
+										HorizontalSnapPointsAlignment="Center">
+							<ItemsPresenter Header="{TemplateBinding Header}"
+											HeaderTemplate="{TemplateBinding HeaderTemplate}"
+											HeaderTransitions="{TemplateBinding HeaderTransitions}"
+											Footer="{TemplateBinding Footer}"
+											FooterTemplate="{TemplateBinding FooterTemplate}"
+											FooterTransitions="{TemplateBinding FooterTransitions}"
+											Padding="{TemplateBinding Padding}" />
+						</ScrollViewer>
+					</ControlTemplate>
+				</Setter.Value>
+			</Setter>
+		</Style>
+		<Style x:Key="TestLVIStyle" TargetType="ListViewItem">
+			<Setter Property="Padding" Value="0" />
+			<Setter Property="MinWidth" Value="0" />
+			<Setter Property="MinHeight" Value="1" />
+			<Setter Property="Template">
+				<Setter.Value>
+					<ControlTemplate TargetType="ListViewItem">
+						<ContentPresenter Content="{TemplateBinding Content}"
+										  ContentTemplate="{TemplateBinding ContentTemplate}"
+										  xamarin:ContentTemplateSelector="{TemplateBinding ContentTemplateSelector}" />
+					</ControlTemplate>
+				</Setter.Value>
+			</Setter>
+		</Style>
+	</UserControl.Resources>
+
+	<Grid Width="100" Height="100">
+		<ListView ItemsSource="{Binding}" ItemContainerStyle="{StaticResource TestLVIStyle}" Style="{StaticResource TestHorizontalLVStyle}">
+			<ListView.ItemTemplate>
+				<DataTemplate>
+					<Border Padding="5" Width="90" Height="90" Background="Pink">
+						<TextBlock Text="{Binding}" HorizontalAlignment="Center" />
+					</Border>
+				</DataTemplate>
+			</ListView.ItemTemplate>
+		</ListView>
+	</Grid>
+</UserControl>
diff --git a/src/SamplesApp/UITests.Shared/Windows_UI_Xaml_Controls/ListView/ListView_Snap_Rubberband.xaml.cs b/src/SamplesApp/UITests.Shared/Windows_UI_Xaml_Controls/ListView/ListView_Snap_Rubberband.xaml.cs
new file mode 100644
index 000000000000..afc5a24f00f0
--- /dev/null
+++ b/src/SamplesApp/UITests.Shared/Windows_UI_Xaml_Controls/ListView/ListView_Snap_Rubberband.xaml.cs
@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Controls.Primitives;
+using Windows.UI.Xaml.Data;
+using Windows.UI.Xaml.Input;
+using Windows.UI.Xaml.Media;
+using Windows.UI.Xaml.Navigation;
+using Uno.UI.Samples.Controls;
+using Uno.UI.Samples.Tests;
+using Uno.UI.Samples.UITests.Helpers;
+
+namespace SamplesApp.Windows_UI_Xaml_Controls.ListView
+{
+	[SampleControlInfo("AAAListView", nameof(ListView_Snap_Rubberband), IsManualTest = true, Description = SampleDescription)]
+	public sealed partial class ListView_Snap_Rubberband : UserControl
+	{
+		private const string SampleDescription =
+			"[ManualTest]: While the LV is snapped to the 1st item, wait at least 1second. " +
+			"Using flipping gesture, over-scroll to left, and then quickly (within 250ms) scroll to the right. " +
+			"The LV should snap to the 2nd item, and not rubber banding back to the first.";
+
+		public ListView_Snap_Rubberband()
+		{
+			this.InitializeComponent();
+			this.DataContext = new[] { 0, 1, 2 };
+		}
+	}
+}
diff --git a/src/Uno.UI/UI/Xaml/Controls/ScrollViewer/ScrollViewer.cs b/src/Uno.UI/UI/Xaml/Controls/ScrollViewer/ScrollViewer.cs
index f2cf515b85fc..a66211bb6bca 100644
--- a/src/Uno.UI/UI/Xaml/Controls/ScrollViewer/ScrollViewer.cs
+++ b/src/Uno.UI/UI/Xaml/Controls/ScrollViewer/ScrollViewer.cs
@@ -1280,6 +1280,7 @@ internal void OnPresenterScrolled(double horizontalOffset, double verticalOffset
 			if (isIntermediate && UpdatesMode != Uno.UI.Xaml.Controls.ScrollViewerUpdatesMode.Synchronous)
 			{
 				RequestUpdate();
+				_snapPointsTimer?.Stop();
 			}
 			else
 			{