97 lines
3.2 KiB
C#
97 lines
3.2 KiB
C#
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using System.Collections.ObjectModel;
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using System.Reactive.Concurrency;
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using System.Reactive.Linq;
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using System.Windows.Threading;
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using TeamsISO.Engine.Controller;
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using TeamsISO.Engine.Domain;
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namespace TeamsISO.App.ViewModels;
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/// <summary>
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/// Top-level view model for the main window. Owns the live collection of <see cref="ParticipantViewModel"/>,
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/// the global settings panel, and the alert banner. Subscribes to <see cref="IIsoController"/>'s observables
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/// and marshals updates onto the UI dispatcher.
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/// </summary>
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public sealed class MainViewModel : ObservableObject, IDisposable
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{
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private readonly IIsoController _controller;
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private readonly Dispatcher _dispatcher;
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private readonly IDisposable _participantsSub;
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private readonly IDisposable _alertsSub;
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private readonly Dictionary<Guid, ParticipantViewModel> _byId = new();
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private string _statusText = "Starting…";
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public ObservableCollection<ParticipantViewModel> Participants { get; } = new();
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public GlobalSettingsViewModel Settings { get; }
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public AlertBannerViewModel AlertBanner { get; } = new();
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public string StatusText
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{
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get => _statusText;
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set => SetField(ref _statusText, value);
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}
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public MainViewModel(IIsoController controller, Dispatcher dispatcher)
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{
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_controller = controller;
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_dispatcher = dispatcher;
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Settings = new GlobalSettingsViewModel(controller);
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_participantsSub = controller.Participants
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.ObserveOn(new SynchronizationContextScheduler(
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System.Threading.SynchronizationContext.Current ?? new DispatcherSynchronizationContext(_dispatcher)))
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.Subscribe(OnParticipantsChanged);
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_alertsSub = controller.Alerts
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.ObserveOn(new SynchronizationContextScheduler(
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System.Threading.SynchronizationContext.Current ?? new DispatcherSynchronizationContext(_dispatcher)))
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.Subscribe(alert =>
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{
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AlertBanner.Current = alert;
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});
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}
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public async Task InitializeAsync(CancellationToken cancellationToken)
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{
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StatusText = "Discovering NDI sources…";
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await _controller.StartAsync(cancellationToken);
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StatusText = $"Engine running at {_controller.GlobalSettings.FramerateHz:F2} fps target.";
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}
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private void OnParticipantsChanged(IReadOnlyList<Participant> incoming)
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{
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var seenIds = new HashSet<Guid>();
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foreach (var p in incoming)
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{
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seenIds.Add(p.Id);
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if (_byId.TryGetValue(p.Id, out var vm))
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{
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vm.Update(p);
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}
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else
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{
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vm = new ParticipantViewModel(_controller, p);
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_byId[p.Id] = vm;
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Participants.Add(vm);
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}
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}
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// Remove participants no longer present
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for (var i = Participants.Count - 1; i >= 0; i--)
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{
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var vm = Participants[i];
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if (!seenIds.Contains(vm.Id))
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{
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_byId.Remove(vm.Id);
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Participants.RemoveAt(i);
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}
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}
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}
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public void Dispose()
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{
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_participantsSub.Dispose();
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_alertsSub.Dispose();
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}
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}
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