CommandPalette WIP

src/AppCommon/FileTime.App.CommandPalette/FileTime.App.CommandPalette.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\FileTime.App.CommandPalette.Abstractions\FileTime.App.CommandPalette.Abstractions.csproj" />
+    <ProjectReference Include="..\FileTime.App.Core.Abstraction\FileTime.App.Core.Abstraction.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="7.0.0" />
+    <PackageReference Include="PropertyChanged.SourceGenerator" Version="1.0.8">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="System.Reactive" Version="6.0.0" />
+  </ItemGroup>
+
+</Project>

src/AppCommon/FileTime.App.CommandPalette/Models/CommandPaletteEntry.cs

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+namespace FileTime.App.CommandPalette.Models;
+
+public class CommandPaletteEntry : ICommandPaletteEntry
+{
+    public string Identifier { get; }
+    public string Title { get; }
+
+    public CommandPaletteEntry(string identifier, string title)
+    {
+        Identifier = identifier;
+        Title = title;
+    }
+}

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();
+}

src/AppCommon/FileTime.App.CommandPalette/Startup.cs

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+using FileTime.App.CommandPalette.Services;
+using FileTime.App.CommandPalette.ViewModels;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection.Extensions;
+
+namespace FileTime.App.CommandPalette;
+
+public static class Startup
+{
+    public static IServiceCollection AddCommandPalette(this IServiceCollection services)
+    {
+        services.TryAddTransient<ICommandPaletteViewModel, CommandPaletteViewModel>();
+        services.TryAddSingleton<ICommandPaletteService, CommandPaletteService>();
+        return services;
+    }
+}

src/AppCommon/FileTime.App.CommandPalette/ViewModels/CommandPaletteEntryViewModel.cs

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+using MvvmGen;
+
+namespace FileTime.App.CommandPalette.ViewModels;
+
+[ViewModel]
+public partial class CommandPaletteEntryViewModel : ICommandPaletteEntryViewModel
+{
+    [Property] private string _identifier;
+    [Property] private string _title;
+
+    public CommandPaletteEntryViewModel(string identifier, string title)
+    {
+        _identifier = identifier;
+        _title = title;
+    }
+}

src/AppCommon/FileTime.App.CommandPalette/ViewModels/CommandPaletteViewModel.cs

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+using Avalonia.Input;
+using FileTime.App.CommandPalette.Services;
+using FileTime.App.Core.ViewModels;
+using MvvmGen;
+
+namespace FileTime.App.CommandPalette.ViewModels;
+
+[ViewModel]
+[Inject(typeof(ICommandPaletteService), "_commandPaletteService")]
+public partial class CommandPaletteViewModel : ICommandPaletteViewModel
+{
+    private string _searchText;
+
+    [Property] private IObservable<bool> _showWindow;
+    [Property] private List<ICommandPaletteEntryViewModel> _filteredMatches;
+    [Property] private ICommandPaletteEntryViewModel? _selectedItem;
+    string IModalViewModel.Name => "CommandPalette";
+
+    public string SearchText
+    {
+        get => _searchText;
+        set
+        {
+            if (_searchText == value) return;
+
+            _searchText = value;
+            OnPropertyChanged();
+
+            UpdateFilteredMatches();
+        }
+    }
+
+    public void Close() => throw new NotImplementedException();
+
+    public void HandleKeyDown(KeyEventArgs keyEventArgs) => throw new NotImplementedException();
+
+    partial void OnInitialize()  
+    {
+        ShowWindow = _commandPaletteService.ShowWindow;
+        UpdateFilteredMatches();
+    }
+
+    private void UpdateFilteredMatches()
+    {
+        FilteredMatches = _commandPaletteService
+            .GetCommands()
+            .Select(c =>
+                (ICommandPaletteEntryViewModel) new CommandPaletteEntryViewModel(c.Identifier, c.Title))
+            .Take(30) // TODO remove magic number
+            .OrderBy(c => c.Title)
+            .ToList();
+
+        if (SelectedItem != null && FilteredMatches.Contains(SelectedItem)) return;
+
+        SelectedItem = FilteredMatches.Count > 0
+            ? FilteredMatches[0]
+            : null;
+    }
+}