CommandPalette WIP

src/AppCommon/FileTime.App.CommandPalette/Services/CommandPaletteService.cs

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+using System.Reactive.Linq;
+using System.Reactive.Subjects;
+using FileTime.App.CommandPalette.Models;
+using FileTime.App.CommandPalette.ViewModels;
+using FileTime.App.Core.Services;
+using PropertyChanged.SourceGenerator;
+
+namespace FileTime.App.CommandPalette.Services;
+
+public partial class CommandPaletteService : ICommandPaletteService
+{
+    private readonly IModalService _modalService;
+    private readonly IIdentifiableUserCommandService _identifiableUserCommandService;
+    private readonly BehaviorSubject<bool> _showWindow = new(false);
+    IObservable<bool> ICommandPaletteService.ShowWindow => _showWindow.AsObservable();
+    [Notify] ICommandPaletteViewModel? _currentModal;
+
+    public CommandPaletteService(
+        IModalService modalService,
+        IIdentifiableUserCommandService identifiableUserCommandService)
+    {
+        _modalService = modalService;
+        _identifiableUserCommandService = identifiableUserCommandService;
+    }
+    public void OpenCommandPalette()
+    {
+        _showWindow.OnNext(true);
+        CurrentModal = _modalService.OpenModal<ICommandPaletteViewModel>();
+    }
+
+    public IReadOnlyList<ICommandPaletteEntry> GetCommands() =>
+        _identifiableUserCommandService
+            .GetCommandIdentifiers()
+            .Select(c => new CommandPaletteEntry(c, c))
+            .ToList()
+            .AsReadOnly();
+}