feat: Add stub for virtualizing recycling scrollview

Maui/VirtualizingRecyclingScrollView/App.xaml

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+<?xml version = "1.0" encoding = "UTF-8" ?>
+<Application xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             xmlns:local="clr-namespace:VirtualizingRecyclingScrollView"
+             x:Class="VirtualizingRecyclingScrollView.App">
+    <Application.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary Source="Resources/Styles/Colors.xaml" />
+                <ResourceDictionary Source="Resources/Styles/Styles.xaml" />
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
+    </Application.Resources>
+</Application>

Maui/VirtualizingRecyclingScrollView/App.xaml.cs

@@ -0,0 +1,14 @@
+namespace VirtualizingRecyclingScrollView;
+
+public partial class App : Application
+{
+	public App()
+	{
+		InitializeComponent();
+	}
+
+	protected override Window CreateWindow(IActivationState? activationState)
+	{
+		return new Window(new AppShell());
+	}
+}

Maui/VirtualizingRecyclingScrollView/AppShell.xaml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<Shell
+    x:Class="VirtualizingRecyclingScrollView.AppShell"
+    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+    xmlns:local="clr-namespace:VirtualizingRecyclingScrollView">
+
+    <ShellContent
+        ContentTemplate="{DataTemplate local:MainPage}"
+        Route="MainPage"/>
+
+</Shell>

Maui/VirtualizingRecyclingScrollView/AppShell.xaml.cs

@@ -0,0 +1,9 @@
+namespace VirtualizingRecyclingScrollView;
+
+public partial class AppShell : Shell
+{
+	public AppShell()
+	{
+		InitializeComponent();
+	}
+}

Maui/VirtualizingRecyclingScrollView/CellModel.cs

@@ -0,0 +1,35 @@
+
+using System.ComponentModel;
+
+namespace VirtualizingRecyclingScrollView;
+
+public class CellModel : INotifyPropertyChanged
+{
+    public Key key;
+
+    private string text;
+
+    private Color color;
+
+    public event PropertyChangedEventHandler? PropertyChanged;
+
+    public string Text
+    {
+        get => this.text;
+        set
+        {
+            this.text = value;
+            this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Text)));
+        }
+    }
+
+    public Color Color
+    {
+        get => this.color;
+        set
+        {
+            this.color = value;
+            this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Color)));
+        }
+    }
+}

Maui/VirtualizingRecyclingScrollView/Key.cs

@@ -0,0 +1,13 @@
+namespace VirtualizingRecyclingScrollView;
+
+public struct Key
+{
+    public int x;
+    public int y;
+
+    public Key(int x, int y)
+    {
+        this.x = x;
+        this.y = y;
+    }
+}

Maui/VirtualizingRecyclingScrollView/MainPage.xaml

@@ -0,0 +1,50 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="VirtualizingRecyclingScrollView.MainPage"
+             xmlns:local="clr-namespace:VirtualizingRecyclingScrollView"
+             xmlns:ios="clr-namespace:Microsoft.Maui.Controls.PlatformConfiguration.iOSSpecific;assembly=Microsoft.Maui.Controls"
+             ios:Page.UseSafeArea="False"
+             Shell.NavBarIsVisible="False">
+
+    <Grid IgnoreSafeArea="True">
+        <Grid.RowDefinitions>
+            <RowDefinition Height="60" />
+            <RowDefinition Height="50" />
+            <RowDefinition Height="*" />
+            <RowDefinition Height="50" />
+        </Grid.RowDefinitions>
+
+        <local:TrackingBorder x:Name="HeaderBackground" Grid.Row="0" Grid.RowSpan="2" Background="#AAFFFFFF" />
+        <Grid Grid.Row="1" x:Name="HeaderContent">
+            <HorizontalStackLayout>
+                <local:TrackingLabel Text="Title" VerticalOptions="Center" Margin="10,0,10,0" FontSize="24" />
+                <local:TrackingBorder Margin="5" Background="Red" WidthRequest="5" HeightRequest="5" />
+                <local:TrackingBorder Margin="5" Background="Red" WidthRequest="5" HeightRequest="5" />
+                <local:TrackingBorder Margin="5" Background="Red" WidthRequest="5" HeightRequest="5" />
+            </HorizontalStackLayout>
+            <HorizontalStackLayout HorizontalOptions="End">
+                <Label Text="{Binding LayoutNodes}" VerticalOptions="Center" HorizontalOptions="End" Margin="10,0,10,0" FontSize="14" WidthRequest="120" HeightRequest="30" />
+                <Label Text="{Binding LayoutVirtualNodes}" VerticalOptions="Center" HorizontalOptions="End" Margin="10,0,10,0" FontSize="14" WidthRequest="120" HeightRequest="30" />
+            </HorizontalStackLayout>
+        </Grid>
+        <local:TrackingBorder x:Name="FooterBackground" Grid.Row="3" Background="#AAFFFFFF" />
+
+        <local:TheScrollView Grid.RowSpan="4" ZIndex="-1">
+            <local:TheScrollView.Template>
+                <DataTemplate x:DataType="local:CellModel">
+                    <!-- Slim template: we can't trim further than that -->
+                    <!-- <local:TrackingLabel Virtualized="True" Text="{Binding Text}" Background="{Binding Color}" Margin="2" FontSize="16" FontAttributes="Bold" HorizontalTextAlignment="Center" VerticalTextAlignment="Center" /> -->
+
+                    <!-- Medium template: no triggers or visual states -->
+                    <local:TrackingBorder Virtualized="True" Background="{Binding Color}" Margin="1" StrokeThickness="1" Stroke="DarkGray">
+                        <local:TrackingLabel Virtualized="True" Text="{Binding Text}" Margin="2" FontSize="16" FontAttributes="Bold" HorizontalTextAlignment="Center" VerticalTextAlignment="Center" />
+                    </local:TrackingBorder>
+
+                    <!-- Fat template: That would include a border, a grid, icon and a label, maybe interactive with a trigger -->
+                </DataTemplate>
+            </local:TheScrollView.Template>
+        </local:TheScrollView>
+    </Grid>
+
+</ContentPage>

Maui/VirtualizingRecyclingScrollView/MainPage.xaml.cs

@@ -0,0 +1,10 @@
+namespace VirtualizingRecyclingScrollView;
+
+public partial class MainPage : ContentPage
+{
+	public MainPage()
+	{
+		this.BindingContext = TrackingModel.Instance;
+		InitializeComponent();
+	}
+}

Maui/VirtualizingRecyclingScrollView/MauiProgram.cs

@@ -0,0 +1,33 @@
+using Microsoft.Extensions.Logging;
+using Microsoft.Maui.Handlers;
+
+namespace VirtualizingRecyclingScrollView;
+
+public static class MauiProgram
+{
+	public static MauiApp CreateMauiApp()
+	{
+		var builder = MauiApp.CreateBuilder();
+		builder
+			.UseMauiApp<App>()
+			.ConfigureMauiHandlers(handlers =>
+			{
+				ViewHandler.ViewCommandMapper.ModifyMapping<IView, IViewHandler>(nameof(IView.InvalidateMeasure), (layout, handler, args, current) =>
+				{
+					// Comment this out to stop layout invalidation...
+					current?.Invoke(layout, handler, args);
+				});
+			})
+			.ConfigureFonts(fonts =>
+			{
+				fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
+				fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
+			});
+
+#if DEBUG
+		builder.Logging.AddDebug();
+#endif
+
+		return builder.Build();
+	}
+}

Maui/VirtualizingRecyclingScrollView/Platforms/Android/AndroidManifest.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+	<application android:allowBackup="true" android:icon="@mipmap/appicon" android:roundIcon="@mipmap/appicon_round" android:supportsRtl="true"></application>
+	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+	<uses-permission android:name="android.permission.INTERNET" />
+</manifest>

Maui/VirtualizingRecyclingScrollView/Platforms/Android/MainActivity.cs

@@ -0,0 +1,10 @@
+using Android.App;
+using Android.Content.PM;
+using Android.OS;
+
+namespace VirtualizingRecyclingScrollView;
+
+[Activity(Theme = "@style/Maui.SplashTheme", MainLauncher = true, LaunchMode = LaunchMode.SingleTop, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize | ConfigChanges.Density)]
+public class MainActivity : MauiAppCompatActivity
+{
+}

Maui/VirtualizingRecyclingScrollView/Platforms/Android/MainApplication.cs

@@ -0,0 +1,15 @@
+using Android.App;
+using Android.Runtime;
+
+namespace VirtualizingRecyclingScrollView;
+
+[Application]
+public class MainApplication : MauiApplication
+{
+	public MainApplication(IntPtr handle, JniHandleOwnership ownership)
+		: base(handle, ownership)
+	{
+	}
+
+	protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
+}

Maui/VirtualizingRecyclingScrollView/Platforms/Android/Resources/values/colors.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#512BD4</color>
+    <color name="colorPrimaryDark">#2B0B98</color>
+    <color name="colorAccent">#2B0B98</color>
+</resources>

Maui/VirtualizingRecyclingScrollView/Platforms/MacCatalyst/AppDelegate.cs

@@ -0,0 +1,9 @@
+using Foundation;
+
+namespace VirtualizingRecyclingScrollView;
+
+[Register("AppDelegate")]
+public class AppDelegate : MauiUIApplicationDelegate
+{
+	protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
+}

Maui/VirtualizingRecyclingScrollView/Platforms/MacCatalyst/Entitlements.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+    <!-- See https://aka.ms/maui-publish-app-store#add-entitlements for more information about adding entitlements.-->
+    <dict>
+        <!-- App Sandbox must be enabled to distribute a MacCatalyst app through the Mac App Store. -->
+        <key>com.apple.security.app-sandbox</key>
+        <true/>
+        <!-- When App Sandbox is enabled, this value is required to open outgoing network connections. -->
+        <key>com.apple.security.network.client</key>
+        <true/>
+    </dict>
+</plist>
+

Maui/VirtualizingRecyclingScrollView/Platforms/MacCatalyst/Info.plist

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <!-- The Mac App Store requires you specify if the app uses encryption. -->
+    <!-- Please consult https://developer.apple.com/documentation/bundleresources/information_property_list/itsappusesnonexemptencryption -->
+    <!-- <key>ITSAppUsesNonExemptEncryption</key> -->
+    <!-- Please indicate <true/> or <false/> here. -->
+
+    <!-- Specify the category for your app here. -->
+    <!-- Please consult https://developer.apple.com/documentation/bundleresources/information_property_list/lsapplicationcategorytype -->
+    <!-- <key>LSApplicationCategoryType</key> -->
+    <!-- <string>public.app-category.YOUR-CATEGORY-HERE</string> -->
+	<key>UIDeviceFamily</key>
+	<array>
+		<integer>2</integer>
+	</array>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>arm64</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>XSAppIconAssets</key>
+	<string>Assets.xcassets/appicon.appiconset</string>
+</dict>
+</plist>

Maui/VirtualizingRecyclingScrollView/Platforms/MacCatalyst/Program.cs

@@ -0,0 +1,15 @@
+using ObjCRuntime;
+using UIKit;
+
+namespace VirtualizingRecyclingScrollView;
+
+public class Program
+{
+	// This is the main entry point of the application.
+	static void Main(string[] args)
+	{
+		// if you want to use a different Application Delegate class from "AppDelegate"
+		// you can specify it here.
+		UIApplication.Main(args, null, typeof(AppDelegate));
+	}
+}

Maui/VirtualizingRecyclingScrollView/Platforms/Tizen/Main.cs

@@ -0,0 +1,16 @@
+using System;
+using Microsoft.Maui;
+using Microsoft.Maui.Hosting;
+
+namespace VirtualizingRecyclingScrollView;
+
+class Program : MauiApplication
+{
+	protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
+
+	static void Main(string[] args)
+	{
+		var app = new Program();
+		app.Run(args);
+	}
+}

Maui/VirtualizingRecyclingScrollView/Platforms/Tizen/tizen-manifest.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest package="maui-application-id-placeholder" version="0.0.0" api-version="9" xmlns="http://tizen.org/ns/packages">
+  <profile name="common" />
+  <ui-application appid="maui-application-id-placeholder" exec="VirtualizingRecyclingScrollView.dll" multiple="false" nodisplay="false" taskmanage="true" type="dotnet" launch_mode="single">
+    <label>maui-application-title-placeholder</label>
+    <icon>maui-appicon-placeholder</icon>
+    <metadata key="http://tizen.org/metadata/prefer_dotnet_aot" value="true" />
+  </ui-application>
+  <shortcut-list />
+  <privileges>
+    <privilege>http://tizen.org/privilege/internet</privilege>
+  </privileges> 
+  <dependencies />
+  <provides-appdefined-privileges />
+</manifest>

Maui/VirtualizingRecyclingScrollView/Platforms/Windows/App.xaml

@@ -0,0 +1,8 @@
+<maui:MauiWinUIApplication
+    x:Class="VirtualizingRecyclingScrollView.WinUI.App"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:maui="using:Microsoft.Maui"
+    xmlns:local="using:VirtualizingRecyclingScrollView.WinUI">
+
+</maui:MauiWinUIApplication>

Maui/VirtualizingRecyclingScrollView/Platforms/Windows/App.xaml.cs

@@ -0,0 +1,24 @@
+using Microsoft.UI.Xaml;
+
+// To learn more about WinUI, the WinUI project structure,
+// and more about our project templates, see: http://aka.ms/winui-project-info.
+
+namespace VirtualizingRecyclingScrollView.WinUI;
+
+/// <summary>
+/// Provides application-specific behavior to supplement the default Application class.
+/// </summary>
+public partial class App : MauiWinUIApplication
+{
+	/// <summary>
+	/// Initializes the singleton application object.  This is the first line of authored code
+	/// executed, and as such is the logical equivalent of main() or WinMain().
+	/// </summary>
+	public App()
+	{
+		this.InitializeComponent();
+	}
+
+	protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
+}
+