feat: Initiate TextBox with keyboard and autofill integration

Author: Youssef1313

src/Uno.UI.Runtime.Skia.Android/AndroidInvisibleTextBoxViewExtension.cs

@@ -35,7 +35,7 @@ internal bool OnNativeKeyEvent(KeyEvent e)
 		try
 		{
 			var isDown = e.Action == KeyEventActions.Down;
-			var args = new KeyEventArgs("keyboard", virtualKey, modifiers, default(CorePhysicalKeyStatus)/*TODO*/, unicodeKey: null/*TODO*/);
+			var args = new KeyEventArgs("keyboard", virtualKey, modifiers, default(CorePhysicalKeyStatus)/*TODO*/, unicodeKey: (char)e.GetUnicodeChar(e.MetaState));
 			if (isDown)
 			{
 				KeyDown?.Invoke(this, args);

src/Uno.UI.Runtime.Skia.Android/AndroidKeyboardInputSource.cs

@@ -34,7 +34,7 @@ public Task Run()
 			ApiExtensibility.Register(typeof(INativeWindowFactoryExtension), o => new AndroidSkiaWindowFactory());
 			ApiExtensibility.Register(typeof(IUnoCorePointerInputSource), o => AndroidCorePointerInputSource.Instance);
 			ApiExtensibility.Register(typeof(IUnoKeyboardInputSource), o => AndroidKeyboardInputSource.Instance);
-			ApiExtensibility.Register<TextBoxView>(typeof(IOverlayTextBoxViewExtension), o => new AndroidInvisibleTextBoxViewExtension(o));
+			ApiExtensibility.Register(typeof(ITextBoxNotificationsProviderSingleton), _ => AndroidSkiaTextBoxNotificationsProviderSingleton.Instance);
 			ApiExtensibility.Register<ContentPresenter>(typeof(ContentPresenter.INativeElementHostingExtension), o => new AndroidSkiaNativeElementHostingExtension(o));
 			ApiExtensibility.Register<CoreWebView2>(typeof(INativeWebViewProvider), o => new AndroidNativeWebViewProvider(o));
 			ApiExtensibility.Register(typeof(ISkiaNativeDatePickerProviderExtension), _ => new AndroidSkiaDatePickerProvider());

src/Uno.UI.Runtime.Skia.Android/AndroidSkiaHost.cs

@@ -0,0 +1,65 @@
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+using Android.Text;
+using Microsoft.UI.Xaml.Controls;
+using Uno.UI.Xaml.Controls.Extensions;
+
+namespace Uno.UI.Runtime.Skia.Android;
+
+internal sealed class AndroidSkiaTextBoxNotificationsProviderSingleton : ITextBoxNotificationsProviderSingleton
+{
+	internal List<TextBox> LiveTextBoxes { get; } = new();
+	internal Dictionary<int, TextBox> LiveTextBoxesMap { get; } = new();
+
+	public static AndroidSkiaTextBoxNotificationsProviderSingleton Instance { get; } = new AndroidSkiaTextBoxNotificationsProviderSingleton();
+
+	private AndroidSkiaTextBoxNotificationsProviderSingleton()
+	{
+	}
+
+	public void OnFocused(TextBox textBox)
+	{
+		if (UnoSKCanvasView.Instance is { } canvasView)
+		{
+			canvasView.TextInputPlugin.ShowTextInput(InputTypes.TextVariationNormal/*TODO: Properly provide this based on textBox.InputScope. This should also respect AcceptsReturn and IsSpellCheckEnabled*/);
+			canvasView.TextInputPlugin.NotifyViewEntered(textBox, textBox.GetHashCode());
+		}
+	}
+
+	public void OnUnfocused(TextBox textBox)
+	{
+		if (UnoSKCanvasView.Instance is { } canvasView)
+		{
+			canvasView.TextInputPlugin.HideTextInput();
+			canvasView.TextInputPlugin.NotifyViewExited(textBox.GetHashCode());
+		}
+	}
+
+	public void OnEnteredVisualTree(TextBox textBox)
+	{
+		LiveTextBoxes.Add(textBox);
+		LiveTextBoxesMap.Add(textBox.GetHashCode(), textBox);
+	}
+
+	public void OnLeaveVisualTree(TextBox textBox)
+	{
+		LiveTextBoxes.Remove(textBox);
+		LiveTextBoxesMap.Remove(textBox.GetHashCode());
+	}
+
+	public void FinishAutofillContext(bool shouldSave)
+	{
+		if (UnoSKCanvasView.Instance is { } canvasView)
+		{
+			canvasView.TextInputPlugin.FinishAutofillContext(shouldSave);
+		}
+	}
+
+	public void NotifyValueChanged(TextBox textBox)
+	{
+		if (UnoSKCanvasView.Instance is { } canvasView)
+		{
+			canvasView.TextInputPlugin.NotifyValueChanged(textBox.GetHashCode(), textBox.Text);
+		}
+	}
+}