Merge pull request #12931 from unoplatform/mergify/bp/legacy/4x/pr-12907

fix: Update `WebView` history properties on JS-based navigation (backport #12907)

src/SamplesApp/UITests.Shared/Microsoft_UI_Xaml_Controls/WebView2Tests/WebView2_NavigationProperties.xaml

@@ -0,0 +1,23 @@
+<Page
+    x:Class="UITests.Microsoft_UI_Xaml_Controls.WebView2Tests.WebView2_NavigationProperties"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:UITests.Microsoft_UI_Xaml_Controls.WebView2Tests"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+	xmlns:controls="using:Microsoft.UI.Xaml.Controls"
+    mc:Ignorable="d"
+    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+
+	<StackPanel Spacing="8">
+		<controls:WebView2 x:Name="TestWebView" Width="300" Height="300" />
+        <TextBlock>
+            <Run Text="Last history change:" />
+            <Run x:Name="LastHistoryChangeRun" Text="" />
+        </TextBlock>
+        <CheckBox x:Name="CanGoBackCheckBox" />
+        <CheckBox x:Name="CanGoForwardCheckBox" />
+        <Button Click="GoBack_Click" Content="Go back" />
+        <Button Click="GoForward_Click" Content="Go forward" />
+    </StackPanel>
+</Page>

src/SamplesApp/UITests.Shared/Microsoft_UI_Xaml_Controls/WebView2Tests/WebView2_NavigationProperties.xaml.cs

@@ -0,0 +1,57 @@
+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 Microsoft.UI.Xaml.Controls;
+
+// The Blank Page item template is documented at https://go.microsoft.com/fwlink/?LinkId=234238
+
+namespace UITests.Microsoft_UI_Xaml_Controls.WebView2Tests
+{
+	/// <summary>
+	/// An empty page that can be used on its own or navigated to within a Frame.
+	/// </summary>
+	[Uno.UI.Samples.Controls.Sample("WebView")]
+	public sealed partial class WebView2_NavigationProperties : Page
+	{
+		public WebView2_NavigationProperties()
+		{
+			this.InitializeComponent();
+			this.Loaded += OnLoaded;
+		}
+
+		private async void OnLoaded(object sender, RoutedEventArgs e)
+		{
+			await TestWebView.EnsureCoreWebView2Async();
+			TestWebView.CoreWebView2.Navigate("https://nventive.com/en");
+			TestWebView.CoreWebView2.HistoryChanged += CoreWebView2_HistoryChanged;
+		}
+
+		private void CoreWebView2_HistoryChanged(Microsoft.Web.WebView2.Core.CoreWebView2 sender, object args)
+		{
+			LastHistoryChangeRun.Text = DateTimeOffset.Now.TimeOfDay.ToString();
+			CanGoBackCheckBox.IsChecked = sender.CanGoBack;
+			CanGoForwardCheckBox.IsChecked = sender.CanGoForward;
+		}
+
+		private void GoForward_Click(object sender, RoutedEventArgs e)
+		{
+			TestWebView.GoForward();
+		}
+
+		private void GoBack_Click(object sender, RoutedEventArgs e)
+		{
+			TestWebView.GoBack();
+		}
+	}
+}

src/SamplesApp/UITests.Shared/UITests.Shared.projitems

@@ -3886,6 +3886,10 @@
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
+    <Page Include="$(MSBuildThisFileDirectory)Microsoft_UI_Xaml_Controls\WebView2Tests\WebView2_NavigationProperties.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
     <Page Include="$(MSBuildThisFileDirectory)Microsoft_UI_Xaml_Controls\WebView2Tests\WebView2_ChromeClient.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
@@ -8727,6 +8731,9 @@
     <Compile Include="$(MSBuildThisFileDirectory)Microsoft_UI_Xaml_Controls\WebView2Tests\WebView2_Basic.xaml.cs">
       <DependentUpon>WebView2_Basic.xaml</DependentUpon>
     </Compile>
+    <Compile Include="$(MSBuildThisFileDirectory)Microsoft_UI_Xaml_Controls\WebView2Tests\WebView2_NavigationProperties.xaml.cs">
+      <DependentUpon>WebView2_NavigationProperties.xaml</DependentUpon>
+    </Compile>
     <Compile Include="$(MSBuildThisFileDirectory)Microsoft_UI_Xaml_Controls\WebView2Tests\WebView2_ChromeClient.xaml.cs">
       <DependentUpon>WebView2_ChromeClient.xaml</DependentUpon>
     </Compile>

src/Uno.UI/UI/Xaml/Controls/WebView/Core/CoreWebView2.cs

@@ -31,6 +31,8 @@ internal CoreWebView2(IWebView owner)
 		_owner = owner;
 	}
 
+	internal IWebView Owner => _owner;
+
 	/// <summary>
 	/// Gets the CoreWebView2Settings object contains various modifiable
 	/// settings for the running WebView.

src/Uno.UI/UI/Xaml/Controls/WebView/IWebView.cs

@@ -1,8 +1,12 @@
-namespace Uno.UI.Xaml.Controls;
+using Windows.UI.Core;
+
+namespace Uno.UI.Xaml.Controls;
 
 internal interface IWebView
 {
 	bool SwitchSourceBeforeNavigating { get; }
 
 	bool IsLoaded { get; }
+
+	CoreDispatcher Dispatcher { get; }
 }

src/Uno.UI/UI/Xaml/Controls/WebView/Native/Android/InternalWebClient.Android.cs

@@ -2,10 +2,8 @@
 using System.Globalization;
 using Android.Graphics;
 using Android.Runtime;
-using Android.Views;
 using Android.Webkit;
 using Microsoft.Web.WebView2.Core;
-using Windows.UI.Xaml.Controls;
 using Windows.Web;
 
 namespace Uno.UI.Xaml.Controls;
@@ -26,6 +24,16 @@ internal InternalClient(CoreWebView2 coreWebView, NativeWebViewWrapper webViewWr
 		_nativeWebViewWrapper = webViewWrapper;
 	}
 
+	public override void DoUpdateVisitedHistory(Android.Webkit.WebView view, string url, bool isReload)
+	{
+		base.DoUpdateVisitedHistory(view, url, isReload);
+
+		_coreWebView.DocumentTitle = view.Title;
+
+		_nativeWebViewWrapper.RefreshHistoryProperties();
+		_coreWebView.RaiseHistoryChanged();
+	}
+
 #pragma warning disable CS0672 // Member overrides obsolete member
 	public override bool ShouldOverrideUrlLoading(Android.Webkit.WebView view, string url)
 #pragma warning restore CS0672 // Member overrides obsolete member
@@ -62,9 +70,6 @@ public override void OnPageFinished(Android.Webkit.WebView view, string url)
 	{
 		_coreWebView.DocumentTitle = view.Title;
 
-		_nativeWebViewWrapper.RefreshHistoryProperties();
-		_coreWebView.RaiseHistoryChanged();
-
 		var uri = !_nativeWebViewWrapper._wasLoadedFromString && !string.IsNullOrEmpty(url) ? new Uri(url) : null;
 
 		_coreWebView.RaiseNavigationCompleted(uri, true, 200, CoreWebView2WebErrorStatus.Unknown);

src/Uno.UI/UI/Xaml/Controls/WebView/Native/iOSmacOS/UnoWKWebView.iOSmacOS.cs

@@ -6,19 +6,15 @@
 using System.Threading.Tasks;
 using Uno.Extensions;
 using Uno.Foundation.Logging;
-using Windows.Web;
 using System.IO;
 using System.Linq;
 using Windows.ApplicationModel.Resources;
 using Uno.UI.Xaml.Controls;
 using System.Net.Http;
 using Microsoft.Web.WebView2.Core;
 using Uno.UI.Extensions;
-using Windows.Foundation;
 using System.Collections.Generic;
 using System.Globalization;
-using System.Text;
-using System.Net;
 using Windows.UI.Core;
 
 #if !__MACOS__ && !__MACCATALYST__ // catalyst https://github.com/xamarin/xamarin-macios/issues/13935
@@ -49,6 +45,8 @@ public partial class UnoWKWebView : WKWebView, INativeWebView, IWKScriptMessageH
 	private readonly string OkString;
 	private readonly string CancelString;
 
+	private bool _isHistoryChangeQueued;
+
 	public UnoWKWebView() : base(CGRect.Empty, new WebKit.WKWebViewConfiguration())
 	{
 		var resourceLoader = ResourceLoader.GetForCurrentView();
@@ -423,10 +421,26 @@ private void RaiseNavigationStarting(object navigationData, out bool cancel)
 	private void RaiseNavigationCompleted(Uri uri, bool isSuccess, int httpStatusCode, CoreWebView2WebErrorStatus errorStatus)
 	{
 		_coreWebView.SetHistoryProperties(CanGoBack, CanGoForward);
-		_coreWebView.RaiseHistoryChanged();
+		QueueHistoryChange();
+
 		_coreWebView.RaiseNavigationCompleted(uri, isSuccess, httpStatusCode, errorStatus);
 	}
 
+	private void QueueHistoryChange()
+	{
+		if (!_isHistoryChangeQueued)
+		{
+			_isHistoryChangeQueued = true;
+			_ = _coreWebView.Owner.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, RaiseQueuedHistoryChange);
+		}
+	}
+
+	private void RaiseQueuedHistoryChange()
+	{
+		_coreWebView.RaiseHistoryChanged();
+		_isHistoryChangeQueued = false;
+	}
+
 #if __IOS__
 	private void ParseUriAndLauchMailto(Uri mailtoUri)
 	{
@@ -572,6 +586,24 @@ internal void OnError(WKWebView webView, WKNavigation navigation, NSError error)
 		_isCancelling = false;
 	}
 
+	public override void DidChangeValue(string forKey)
+	{
+		base.DidChangeValue(forKey);
+
+		if (forKey.Equals(nameof(Title), StringComparison.OrdinalIgnoreCase))
+		{
+			_coreWebView.DocumentTitle = Title;
+		}
+		else if (
+			forKey.Equals(nameof(Url), StringComparison.OrdinalIgnoreCase) ||
+			forKey.Equals(nameof(CanGoBack), StringComparison.OrdinalIgnoreCase) ||
+			forKey.Equals(nameof(CanGoForward), StringComparison.OrdinalIgnoreCase))
+		{
+			_coreWebView.SetHistoryProperties(CanGoBack, CanGoForward);
+			QueueHistoryChange();
+		}
+	}
+
 	public override bool CanGoBack => base.CanGoBack && GetNearestValidHistoryItem(direction: -1) != null;
 
 	public override bool CanGoForward => base.CanGoForward && GetNearestValidHistoryItem(direction: 1) != null;

src/Uno.UI/UI/Xaml/Controls/WebView/WebView1/WebView.cs

@@ -9,6 +9,7 @@
 using System.Linq;
 using System.Threading.Tasks;
 using System.Threading;
+using Windows.UI.Core;
 
 namespace Windows.UI.Xaml.Controls;
 
@@ -42,6 +43,8 @@ public WebView()
 
 	bool IWebView.SwitchSourceBeforeNavigating => true;
 
+	CoreDispatcher IWebView.Dispatcher => Dispatcher;
+
 	protected override void OnApplyTemplate() => CoreWebView2.OnOwnerApplyTemplate();
 
 	public void Navigate(global::System.Uri source) => CoreWebView2.Navigate(source.ToString());

src/Uno.UI/UI/Xaml/Controls/WebView/WebView2/WebView2.cs

@@ -1,12 +1,12 @@
 #nullable enable
 
-using Windows.Foundation;
-using Windows.UI.Xaml.Controls;
 using System;
 using System.Threading.Tasks;
-using Uno;
 using Microsoft.Web.WebView2.Core;
 using Uno.UI.Xaml.Controls;
+using Windows.Foundation;
+using Windows.UI.Core;
+using Windows.UI.Xaml.Controls;
 
 namespace Microsoft.UI.Xaml.Controls;
 
@@ -44,6 +44,8 @@ public WebView2()
 
 	bool IWebView.SwitchSourceBeforeNavigating => false; // WebView2 switches source only when navigation completes.
 
+	CoreDispatcher IWebView.Dispatcher => Dispatcher;
+
 	protected override void OnApplyTemplate() => CoreWebView2.OnOwnerApplyTemplate();
 
 	private void WebView2_Loaded(object sender, Windows.UI.Xaml.RoutedEventArgs e) =>