Module 3 - Connect UI with mock data
In this module, you will create models and services that will be used by the presentation layer to retrieve data and display it in the appropriate UI controls. You are first going to add a mock service that will simulate YouTube search results. In module 9, you will wire the service up with live search results from YouTube's API.
Create entities
In this section, you will create the entities that will be used to transfer data between the service and the presentation layers.
Create another folder in the project (i.e. TubePlayer) named Services, and add another subfolder to it, named Models.
Create a class named Models.cs and replace its content with the code below. If you are using Visual Studio, you can right-click the Models folder and click Add Class. When prompted, type Models.cs as the file name and press Enter.
namespace TubePlayer.Services.Models; public record ThumbnailData(string? Url); public record ThumbnailsData(ThumbnailData? Medium, ThumbnailData? High); public record SnippetData(string? ChannelId, string? Title, string? Description, ThumbnailsData? Thumbnails, string? ChannelTitle, DateTime? PublishedAt); public record StatisticsData(string? ViewCount, string? LikeCount, string? CommentCount, string? SubscriberCount); public partial record ChannelData( string? Id, SnippetData? Snippet, StatisticsData? Statistics = default); public record ContentDetailsData(string? Duration); public partial record YoutubeVideoDetailsData( string? Id, SnippetData? Snippet, StatisticsData? Statistics = default, ContentDetailsData? ContentDetails = default); public record VideoDetailsResultData(ImmutableList<YoutubeVideoDetailsData>? Items); public record ChannelSearchResultData(ImmutableList<ChannelData>? Items);In the folder Business → Models, add a new file called Models.cs and replace its contents with the following code.
namespace TubePlayer.Business.Models; public partial record YoutubeVideo(ChannelData Channel, YoutubeVideoDetailsData Details) { public string? Id => Details.Id; public string FormattedSubscriberCount => $"{FormatLongNumber(SubscriberCount)} subscriber{(SubscriberCount > 1 ? "s" : string.Empty)}"; public string FormattedStatistics => $"{FormattedViewCount} {Bullet} {FormattedPublishedAt}"; private long ViewCount => long.TryParse(Details.Statistics?.ViewCount, out var result) ? result : default; private TimeSpan PublishedAtAgo => (Details.Snippet?.PublishedAt).GetValueOrDefault(defaultValue: DateTime.Now).Subtract(DateTime.Now); private long SubscriberCount => long.TryParse(Channel.Statistics?.SubscriberCount, out var result) ? result : default; private string FormattedViewCount => $"{FormatLongNumber(ViewCount)} view{(ViewCount > 1 ? "s" : string.Empty)}"; private string FormattedPublishedAt => ToFriendlyString(PublishedAtAgo); private const string Bullet = "•"; private const long Thousand = 1_000; private const long Million = Thousand * Thousand; private static string FormatLongNumber(long number) => number switch { >= Million => (number / Million).ToString("0.##") + "M", >= Thousand => (number / Thousand).ToString("0.##") + "K", _ => number.ToString() }; private static string ToFriendlyString(TimeSpan elapsedTime) { double minutesElapsed = Math.Abs(elapsedTime.TotalMinutes); var result = minutesElapsed switch { < 0.75 => "less than a minute", < 1.5 => "about a minute", < 45 => $"{Math.Round(minutesElapsed)} minutes", < 90 => "about an hour", < 60 * 24 => $"about {Math.Round(Math.Abs(elapsedTime.TotalHours))} hours", < 60 * 48 => "a day", < 60 * 24 * 30 => $"{Math.Floor(Math.Abs(elapsedTime.TotalDays))} days", < 60 * 24 * 60 => "about a month", < 60 * 24 * 365 => $"{Math.Floor(Math.Abs(elapsedTime.TotalDays / 30))} months", < 60 * 24 * 365 * 2 => "about a year", _ => $"{Math.Floor(Math.Abs(elapsedTime.TotalDays / 365))} years" }; return $"{result} ago"; } } public record YoutubeVideoSet(IImmutableList<YoutubeVideo> Videos, string NextPageToken) { public static YoutubeVideoSet CreateEmpty() => new(ImmutableList.Create<YoutubeVideo>(), string.Empty); }
Add mock data service
In the Business folder, add a class named YoutubeServiceMockData.cs, and replace its content with the following:
YoutubeServiceMockData.cs code contents (collapsed for brevity)
namespace TubePlayer.Business;
public class YoutubeServiceMockData
{
public const string ChannelData =
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This class contains two constant variables that are assigned to partial JSON output results taken from a real YouTube search query of the term 'Uno Platform'.
Create service interface, mock data, mock service, and register services
In the same folder (Business), create a new interface file named IYoutubeService.cs, that will represent our data service. Ignore errors you might see while editing the following files, these will addressed soon by adding the missing namespaces globally.
namespace TubePlayer.Business; public interface IYoutubeService { Task<YoutubeVideoSet> SearchVideos(string searchQuery, string nextPageToken, uint maxResult, CancellationToken ct); }Add another class named YoutubeServiceMock.cs to the Business folder and replace its content with the following:
YoutubeServiceMock.cs code contents (collapsed for brevity)
using System.Diagnostics.CodeAnalysis; namespace TubePlayer.Business; public class YoutubeServiceMock : IYoutubeService { private readonly VideoDetailsResultData _details; private readonly IDictionary<string, ChannelData> _channels; public YoutubeServiceMock(ISerializer serializer) { _details = serializer.FromString<VideoDetailsResultData>(YoutubeServiceMockData.DetailsData)!; var channelsData = serializer.FromString<ChannelSearchResultData>(YoutubeServiceMockData.ChannelData)!; _channels = channelsData.Items!.ToDictionary(channel => channel.Id!, StringComparer.OrdinalIgnoreCase); } public Task<YoutubeVideoSet> SearchVideos(string searchQuery, string nextPageToken, uint maxResult, CancellationToken ct) { var filtered = _details .Items! .Where(detail => detail.Snippet!.Title!.Contains(searchQuery, StringComparison.OrdinalIgnoreCase)); var videos = filtered .Select(detail => new YoutubeVideo(_channels[detail.Snippet!.ChannelId!], detail)) .ToImmutableList(); var result = new YoutubeVideoSet(videos, NextPageToken: string.Empty); return Task.FromResult(result); } }
The SearchVideos method reads the JSON result you added in the previous instruction and deserializes it into ChannelSearchResultData and VideoDetailsResultData objects respectively.
Register service
As we've selected Dependency Injection when generating the app, it includes full DI support on all platforms.
You will now register the YoutubeServiceMock to be provided every time an IYoutubeService is requested.
Open GlobalUsings.cs and append the following lines to it:
global using System.Text.Json; global using TubePlayer.Business; global using TubePlayer.Services.Models;In Visual Studio, you can sort the usings, go to the menu and click Edit → IntelliSense → Sort Usings (Alt+E,I,S).
Open the App.xaml.cs file (in the project folder), head to the
ConfigureServicessection, remove the comments in it, and add the following registrations instead:services.AddSingleton<IYoutubeService, YoutubeServiceMock>();Before the line
.ConfigureServicesadd the following service registration:.UseSerialization(services => { services.AddSingleton(new JsonSerializerOptions { PropertyNamingPolicy = JsonNamingPolicy.CamelCase }); })This sets up Uno Platform's serialization extension.
Setup the presentation layer with the service
Use mock service in the model
Open the file MainModel.cs and replace its content with the following:
namespace TubePlayer.Presentation; public partial record MainModel(IYoutubeService YoutubeService) { public IState<string> SearchTerm => State<string>.Value(this, () => "Uno Platform"); }The
SearchTermis an MVUX state, with "Uno Platform" set as its default value. Feeds and states are part of the MVUX framework developed by Uno Platform.
Both feeds and states are used as an async data connection point between the model and its underlying services. The MVUX also offers controls that can interact with feeds and states.
The difference between states and feeds is that a state holds the state of the data and can be updated manually, whereas feeds only act as a bridge to the data coming from the service.To learn more about MVUX, refer to the MVUX docs.
After the
SearchTermproperty, add another property. Contrary to theSearchTermwhich is a state to support two-way binding to and from the searchTextBox, theVideoSearchResultsproperty we are now adding will be a list-feed (a feed of a collection of items) that requests and obtains the search results we just set up in the mock service.public IListFeed<YoutubeVideo> VideoSearchResults => SearchTerm .Where(searchTerm => searchTerm is { Length: > 0 }) .SelectAsync(async (searchTerm, ct) => await YoutubeService.SearchVideos(searchTerm, nextPageToken: string.Empty, maxResult: 30, ct)) .Select(result => result.Videos) .AsListFeed();
Bind UI
Go back to MainPage.cs and set the
Page'sDataContextto the generated ViewModel ofMainModel, by adding the following line to the beginning of the UI tree (afterthis.).+this.DataContext<MainViewModel>((page, vm) => page .NavigationCacheMode(NavigationCacheMode.Required) ...Add a closing parenthesis at the end of the C# Markup tree of
MainModelto close that (you can just add another closing parenthesis before the terminating semicolon (;).Bind the
TextBoxto theSearchTermstate property, and expand theListView's template like the following:namespace TubePlayer.Presentation; public partial class MainPage : Page { public MainPage() { this.DataContext<MainViewModel>((page, vm) => page .NavigationCacheMode(NavigationCacheMode.Required) .Background(Theme.Brushes.Background.Default) .Content(new Grid() .SafeArea(SafeArea.InsetMask.All) .RowDefinitions("Auto, *") .Children( new TextBox() .Text(x => x .Binding(() => vm.SearchTerm) .Mode(BindingMode.TwoWay) .UpdateSourceTrigger(UpdateSourceTrigger.PropertyChanged)) .PlaceholderText("Search term"), new ListView() .Grid(row: 1) .ItemsSource(() => vm.VideoSearchResults) .ItemTemplate<YoutubeVideo>(ytv => new StackPanel() .Children( new TextBlock() .FontWeight(FontWeights.Bold) .Text(() => ytv.Details.Snippet?.ChannelTitle), new TextBlock() .Text(() => ytv.Details.Snippet?.Title)))))); } }The
DataTemplateis set for aYoutubeVideoobject. It consists of aStackPanelcontaining two text fields for the video title (styled in bold text), and the title of the YouTube channel that published the video.
Update other models
Open the VideoDetailsModel.cs file, add a
YoutubeVideoproperty instead ofEntity, as well as theVideoSourceproperty. Here are the updated contents of the file:using Windows.Media.Core; namespace TubePlayer.Presentation; public partial record VideoDetailsModel(YoutubeVideo Video) { public IFeed<MediaSource> VideoSource => Feed.Async((ct) => new ValueTask<MediaSource>()); }These properties are currently defined as placeholders to enable bindings to work properly but will be implemented to play YouTube videos in module 10.
In the VideoDetailsPage.cs, remove the
Textextension method for now, as its binding depends on theEntityproperty we've just removed.new TextBlock() - .Text(() => vm.Entity.Name) .HorizontalAlignment(HorizontalAlignment.Center) ...You can now close all open tabs. In Visual Studio, this can be achieved by right-clicking any tab and clicking on Close All Tabs.
Run the app
Run the app.
TheListViewwill bind with the list-feed which will retrieve the JSON results from the service, based on the search term, which defaults to 'Uno Platform'.
Try changing the search term. Let's see what we have for XAML (note that this is based on our limited JSON data):
Next Step
In the next step, you're going to build the UI.
The UI for the Tube Player app has been designed using Figma - an app design tool, along with its Uno Platform plugin for Figma.
Note
The next module exports the design from Figma. If you don't want to use Figma, you can skip the next module and go directly to Module 5, which provides the final C# Markup exported from Figma with some minor adjustments.