Feature: Display release notes after updating app

src/Files.App/App.xaml.cs

@@ -208,6 +208,7 @@ await Task.WhenAll(
 			var updateService = Ioc.Default.GetRequiredService<IUpdateService>();
 			await updateService.CheckForUpdates();
 			await updateService.DownloadMandatoryUpdates();
+			await updateService.CheckLatestReleaseNotesAsync();
 
 			static async Task OptionalTask(Task task, bool condition)
 			{

src/Files.App/ServicesImplementation/SideloadUpdateService.cs

@@ -8,6 +8,7 @@
 using System.Diagnostics;
 using System.IO;
 using System.Net.Http;
+using System.Threading;
 using System.Threading.Tasks;
 using System.Xml.Serialization;
 using Windows.ApplicationModel;
@@ -55,13 +56,17 @@ public bool IsUpdating
 			private set => SetProperty(ref _isUpdating, value);
 		}
 
-		private bool _isAppUpdated;
 		public bool IsAppUpdated
 		{
-			get => _isAppUpdated;
-			private set => SetProperty(ref _isAppUpdated, value);
+			get => SystemInformation.Instance.IsAppUpdated;
 		}
 
+		private bool _isReleaseNotesAvailable;
+		public bool IsReleaseNotesAvailable
+		{
+			get => _isReleaseNotesAvailable;
+			private set => SetProperty(ref _isReleaseNotesAvailable, value);
+		}
 		public async Task DownloadUpdates()
 		{
 			await ApplyPackageUpdate();
@@ -72,9 +77,33 @@ public Task DownloadMandatoryUpdates()
 			return Task.CompletedTask;
 		}
 
-		public SideloadUpdateService()
+		public async Task<string?> GetLatestReleaseNotesAsync(CancellationToken cancellationToken = default)
+		{
+			var applicationVersion = $"{SystemInformation.Instance.ApplicationVersion.Major}.{SystemInformation.Instance.ApplicationVersion.Minor}.{SystemInformation.Instance.ApplicationVersion.Build}";
+			var releaseNotesLocation = string.Concat("https://raw.githubusercontent.com/files-community/Release-Notes/main/", applicationVersion, ".md");
+
+			using (var client = new HttpClient())
+			{
+				try
+				{
+					var result = await client.GetStringAsync(releaseNotesLocation, cancellationToken);
+					return result == string.Empty ? null : result;
+				}
+				catch
+				{
+					return null;
+				}
+			}
+		}
+
+		public async Task CheckLatestReleaseNotesAsync(CancellationToken cancellationToken = default)
 		{
-			IsAppUpdated = SystemInformation.Instance.IsAppUpdated;
+			if (!IsAppUpdated)
+				return;
+
+			var result = await GetLatestReleaseNotesAsync();
+			if (result is not null)
+				IsReleaseNotesAvailable = true;
 		}
 
 		public async Task CheckForUpdates()

src/Files.App/ServicesImplementation/UpdateService.cs

@@ -7,6 +7,8 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Net.Http;
+using System.Threading;
 using System.Threading.Tasks;
 using Windows.Services.Store;
 using WinRT.Interop;
@@ -34,18 +36,21 @@ public bool IsUpdating
 			private set => SetProperty(ref _isUpdating, value);
 		}
 
-		private bool _isAppUpdated;
+		private bool _isReleaseNotesAvailable;
+		public bool IsReleaseNotesAvailable
+		{
+			get => _isReleaseNotesAvailable;
+			private set => SetProperty(ref _isReleaseNotesAvailable, value);
+		}
+
 		public bool IsAppUpdated
 		{
-			get => _isAppUpdated;
-			private set => SetProperty(ref _isAppUpdated, value);
+			get => SystemInformation.Instance.IsAppUpdated;
 		}
 
 		public UpdateService()
 		{
 			_updatePackages = new List<StorePackageUpdate>();
-
-			IsAppUpdated = SystemInformation.Instance.IsAppUpdated;
 		}
 
 		public async Task DownloadUpdates()
@@ -143,6 +148,36 @@ private static async Task<bool> ShowDialogAsync()
 			return result == ContentDialogResult.Primary;
 		}
 
+		public async Task CheckLatestReleaseNotesAsync(CancellationToken cancellationToken = default)
+		{
+			if (!IsAppUpdated)
+				return;
+
+			var result = await GetLatestReleaseNotesAsync();
+
+			if (result is not null)
+				IsReleaseNotesAvailable = true;
+		}
+
+		public async Task<string?> GetLatestReleaseNotesAsync(CancellationToken cancellationToken = default)
+		{
+			var applicationVersion = $"{SystemInformation.Instance.ApplicationVersion.Major}.{SystemInformation.Instance.ApplicationVersion.Minor}.{SystemInformation.Instance.ApplicationVersion.Build}";
+			var releaseNotesLocation = string.Concat("https://raw.githubusercontent.com/files-community/Release-Notes/main/", applicationVersion, ".md");
+
+			using (var client = new HttpClient())
+			{
+				try
+				{
+					var result = await client.GetStringAsync(releaseNotesLocation, cancellationToken);
+					return result == string.Empty ? null : result;
+				}
+				catch
+				{
+					return null;
+				}
+			}
+		}
+
 		// WINUI3
 		private static ContentDialog SetContentDialogRoot(ContentDialog contentDialog)
 		{

src/Files.App/UserControls/AddressToolbar.xaml

@@ -265,18 +265,18 @@
 					x:Name="UpdateButton"
 					HorizontalContentAlignment="Stretch"
 					VerticalContentAlignment="Stretch"
-					x:Load="{x:Bind ViewModel.UpdateService.IsUpdateAvailable, Mode=OneWay}"
+					x:Load="{x:Bind ViewModel.IsUpdateAvailable, Mode=OneWay}"
 					AccessKey="1"
 					AutomationProperties.Name="{helpers:ResourceString Name=UpdateFiles}"
 					Command="{x:Bind ViewModel.UpdateCommand, Mode=OneWay}"
-					IsEnabled="{x:Bind ViewModel.UpdateService.IsUpdating, Mode=OneWay, Converter={StaticResource BoolNegationConverter}}"
+					IsEnabled="{x:Bind ViewModel.IsUpdating, Mode=OneWay, Converter={StaticResource BoolNegationConverter}}"
 					Style="{StaticResource AddressToolbarButtonStyle}"
 					ToolTipService.ToolTip="{helpers:ResourceString Name=UpdateFiles}">
 					<Grid>
 						<!--  Icon  -->
 						<FontIcon
 							x:Name="UpdateIcon"
-							x:Load="{x:Bind ViewModel.UpdateService.IsUpdating, Mode=OneWay, Converter={StaticResource BoolNegationConverter}}"
+							x:Load="{x:Bind ViewModel.IsUpdating, Mode=OneWay, Converter={StaticResource BoolNegationConverter}}"
 							FontSize="14"
 							Foreground="{ThemeResource SystemAccentColor}"
 							Glyph="&#xE896;" />
@@ -286,7 +286,7 @@
 							x:Name="UpdateProgressRing"
 							Width="20"
 							Height="20"
-							x:Load="{x:Bind ViewModel.UpdateService.IsUpdating, Mode=OneWay}"
+							x:Load="{x:Bind ViewModel.IsUpdating, Mode=OneWay}"
 							IsIndeterminate="True" />
 					</Grid>
 				</Button>
@@ -296,7 +296,7 @@
 					x:Name="ViewReleaseNotesButton"
 					HorizontalContentAlignment="Stretch"
 					VerticalContentAlignment="Stretch"
-					x:Load="{x:Bind ViewModel.UpdateService.IsAppUpdated, Mode=OneWay}"
+					x:Load="{x:Bind ViewModel.IsReleaseNotesVisible, Mode=OneWay}"
 					AccessKey="2"
 					AutomationProperties.Name="{helpers:ResourceString Name=ReleaseNotes}"
 					Command="{x:Bind ViewModel.ViewReleaseNotesCommand, Mode=OneWay}"
@@ -338,7 +338,6 @@
 			<!--  Release Notes Teaching Tip  -->
 			<TeachingTip
 				x:Name="ReleaseNotesTeachingTip"
-				Title="{helpers:ResourceString Name=ReleaseNotes}"
 				IsLightDismissEnabled="True"
 				IsOpen="{x:Bind ViewModel.IsReleaseNotesOpen, Mode=TwoWay}"
 				Target="{x:Bind ViewReleaseNotesButton}">
@@ -361,13 +360,14 @@
 				<!--  Markdown Content  -->
 				<TeachingTip.Content>
 					<ScrollViewer
+						Width="260"
 						Height="240"
-						HorizontalScrollMode="Disabled"
-						VerticalScrollMode="Enabled">
+						HorizontalScrollMode="Auto"
+						VerticalScrollMode="Auto">
 						<controls:MarkdownTextBlock
-							Padding="0,12"
 							Background="Transparent"
-							Text="Coming Soon 👀" />
+							ListGutterWidth="16"
+							Text="{x:Bind ViewModel.ReleaseNotes, Mode=OneWay}" />
 					</ScrollViewer>
 				</TeachingTip.Content>
 			</TeachingTip>

src/Files.App/ViewModels/ToolbarViewModel.cs

@@ -7,6 +7,7 @@
 using Files.App.Filesystem;
 using Files.App.Filesystem.StorageItems;
 using Files.App.Helpers;
+using Files.App.ServicesImplementation;
 using Files.App.Shell;
 using Files.App.UserControls;
 using Files.App.Views;
@@ -23,10 +24,13 @@
 using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
+using System.ComponentModel;
 using System.IO;
 using System.Linq;
+using System.Net.Http;
 using System.Threading.Tasks;
 using System.Windows.Input;
+using Vanara.PInvoke;
 using Windows.ApplicationModel.DataTransfer;
 using Windows.Storage;
 using Windows.UI.Text;
@@ -40,7 +44,6 @@ namespace Files.App.ViewModels
 	public class ToolbarViewModel : ObservableObject, IAddressToolbar, IDisposable
 	{
 		private IUserSettingsService UserSettingsService { get; } = Ioc.Default.GetRequiredService<IUserSettingsService>();
-
 		public IUpdateService UpdateService { get; } = Ioc.Default.GetService<IUpdateService>()!;
 
 		public delegate void ToolbarPathItemInvokedEventHandler(object sender, PathNavigationEventArgs e);
@@ -252,6 +255,41 @@ public bool IsLayoutAdaptive
 		public bool IsAdaptiveLayoutEnabled
 			=> UserSettingsService.FoldersSettingsService.EnableOverridingFolderPreferences;
 
+		private bool isUpdating;
+		public bool IsUpdating
+		{
+			get => isUpdating;
+			set => SetProperty(ref isUpdating, value);
+		}
+
+		private bool isUpdateAvailable;
+		public bool IsUpdateAvailable
+		{
+			get => isUpdateAvailable;
+			set => SetProperty(ref isUpdateAvailable, value);
+		}
+
+		private string? releaseNotes;
+		public string? ReleaseNotes
+		{
+			get => releaseNotes;
+			set => SetProperty(ref releaseNotes, value);
+		}
+
+		private bool isReleaseNotesVisible;
+		public bool IsReleaseNotesVisible
+		{
+			get => isReleaseNotesVisible;
+			set => SetProperty(ref isReleaseNotesVisible, value);
+		}
+
+		private bool isReleaseNotesOpen;
+		public bool IsReleaseNotesOpen
+		{
+			get => isReleaseNotesOpen;
+			set => SetProperty(ref isReleaseNotesOpen, value);
+		}
+
 		private bool canCopyPathInPage;
 		public bool CanCopyPathInPage
 		{
@@ -312,13 +350,6 @@ public bool IsSearchBoxVisible
 			}
 		}
 
-		private bool isReleaseNotesOpen;
-		public bool IsReleaseNotesOpen
-		{
-			get => isReleaseNotesOpen;
-			set => SetProperty(ref isReleaseNotesOpen, value);
-		}
-
 		private string? pathText;
 		public string? PathText
 		{
@@ -379,12 +410,33 @@ public ToolbarViewModel()
 
 			SearchBox.Escaped += SearchRegion_Escaped;
 			UserSettingsService.OnSettingChangedEvent += UserSettingsService_OnSettingChangedEvent;
+			UpdateService.PropertyChanged += UpdateService_OnPropertyChanged;
+		}
+
+		private async void UpdateService_OnPropertyChanged(object? sender, PropertyChangedEventArgs e)
+		{
+			IsUpdateAvailable = UpdateService.IsUpdateAvailable;			 
+			IsUpdating = UpdateService.IsUpdating;
+
+			// Bad code, result is called twice when checking for release notes
+			if (UpdateService.IsReleaseNotesAvailable)
+				await CheckForReleaseNotesAsync();
 		}
 
 		private void DoViewReleaseNotes()
 		{
 			IsReleaseNotesOpen = true;
 		}
+
+		public async Task CheckForReleaseNotesAsync()
+		{
+			var result = await UpdateService.GetLatestReleaseNotesAsync();
+			if (result is null)
+				return;
+
+			ReleaseNotes = result;
+			IsReleaseNotesVisible = true;
+		}
 
 		private void UserSettingsService_OnSettingChangedEvent(object? sender, SettingChangedEventArgs e)
 		{

src/Files.Backend/Services/IUpdateService.cs

@@ -1,4 +1,7 @@
-using System.ComponentModel;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Threading;
 using System.Threading.Tasks;
 
 namespace Files.Backend.Services
@@ -20,10 +23,22 @@ public interface IUpdateService : INotifyPropertyChanged
 		/// </summary>
 		bool IsAppUpdated { get; }
 
+		/// <summary>
+		/// Gets a value indicating if release notes are available.
+		/// </summary>
+		bool IsReleaseNotesAvailable { get; }
+
 		Task DownloadUpdates();
 
 		Task DownloadMandatoryUpdates();
 
 		Task CheckForUpdates();
+
+		Task CheckLatestReleaseNotesAsync(CancellationToken cancellationToken = default);
+
+		/// <summary>
+		/// Gets release notes for the latest release
+		/// </summary>
+		Task<string?> GetLatestReleaseNotesAsync(CancellationToken cancellationToken = default);
 	}
 }