initial push

Photos/App.axaml

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+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="Photos.App"
+             xmlns:local="using:Photos"
+             RequestedThemeVariant="Default">
+             <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
+
+    <Application.DataTemplates>
+        <local:ViewLocator/>
+    </Application.DataTemplates>
+  
+    <Application.Styles>
+        <FluentTheme />
+    </Application.Styles>
+</Application>

Photos/App.axaml.cs

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+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Data.Core;
+using Avalonia.Data.Core.Plugins;
+using System.Linq;
+using Avalonia.Markup.Xaml;
+using Photos.ViewModels;
+using Photos.Views;
+
+namespace Photos;
+
+public partial class App : Application
+{
+    public override void Initialize()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            // Avoid duplicate validations from both Avalonia and the CommunityToolkit. 
+            // More info: https://docs.avaloniaui.net/docs/guides/development-guides/data-validation#manage-validationplugins
+            DisableAvaloniaDataAnnotationValidation();
+            desktop.MainWindow = new MainWindow
+            {
+                DataContext = new MainWindowViewModel(),
+            };
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+
+    private void DisableAvaloniaDataAnnotationValidation()
+    {
+        // Get an array of plugins to remove
+        var dataValidationPluginsToRemove =
+            BindingPlugins.DataValidators.OfType<DataAnnotationsValidationPlugin>().ToArray();
+
+        // remove each entry found
+        foreach (var plugin in dataValidationPluginsToRemove)
+        {
+            BindingPlugins.DataValidators.Remove(plugin);
+        }
+    }
+}

Photos/Models/Photo.cs

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+using System;
+using System.IO;
+using Avalonia.Media;
+using Avalonia.Media.Imaging;
+using Avalonia.Platform.Storage;
+
+namespace Photos.Models;
+
+public class Photo
+{
+    public string DisplayName { get; set; }
+    public string FullPath { get; set; }
+    public string DisplayPath { get; set; }
+
+    public IImage Source { get; set; }
+
+    public Photo(string path, string relativeTo)
+    {
+        DisplayName = System.IO.Path.GetFileName(path);
+        FullPath = path;
+        DisplayPath = path.Remove(0, relativeTo.Length + 1);
+        using (var stream = File.OpenRead(path))
+        {
+            Source = new Bitmap(stream);
+        }
+    }
+}

Photos/Photos.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <OutputType>WinExe</OutputType>
+        <TargetFramework>net9.0</TargetFramework>
+        <Nullable>enable</Nullable>
+        <ApplicationManifest>app.manifest</ApplicationManifest>
+        <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <AvaloniaResource Include="Assets\**"/>
+    </ItemGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Avalonia" Version="11.3.10"/>
+        <PackageReference Include="Avalonia.Desktop" Version="11.3.10"/>
+        <PackageReference Include="Avalonia.Themes.Fluent" Version="11.3.10"/>
+        <PackageReference Include="Avalonia.Fonts.Inter" Version="11.3.10"/>
+        <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
+        <PackageReference Include="Avalonia.Diagnostics" Version="11.3.10">
+            <IncludeAssets Condition="'$(Configuration)' != 'Debug'">None</IncludeAssets>
+            <PrivateAssets Condition="'$(Configuration)' != 'Debug'">All</PrivateAssets>
+        </PackageReference>
+        <PackageReference Include="CommunityToolkit.Mvvm" Version="8.2.1"/>
+        <PackageReference Include="Xaml.Behaviors" Version="11.3.9" />
+    </ItemGroup>
+</Project>

Photos/Program.cs

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+using Avalonia;
+using System;
+
+namespace Photos;
+
+sealed class Program
+{
+    // Initialization code. Don't use any Avalonia, third-party APIs or any
+    // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
+    // yet and stuff might break.
+    [STAThread]
+    public static void Main(string[] args) => BuildAvaloniaApp()
+        .StartWithClassicDesktopLifetime(args);
+
+    // Avalonia configuration, don't remove; also used by visual designer.
+    public static AppBuilder BuildAvaloniaApp()
+        => AppBuilder.Configure<App>()
+            .UsePlatformDetect()
+            .WithInterFont()
+            .LogToTrace();
+}

Photos/ViewLocator.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Diagnostics.CodeAnalysis;
+using Avalonia.Controls;
+using Avalonia.Controls.Templates;
+using Photos.ViewModels;
+
+namespace Photos;
+
+/// <summary>
+/// Given a view model, returns the corresponding view if possible.
+/// </summary>
+[RequiresUnreferencedCode(
+    "Default implementation of ViewLocator involves reflection which may be trimmed away.",
+    Url = "https://docs.avaloniaui.net/docs/concepts/view-locator")]
+public class ViewLocator : IDataTemplate
+{
+    public Control? Build(object? param)
+    {
+        if (param is null)
+            return null;
+
+        var name = param.GetType().FullName!.Replace("ViewModel", "View", StringComparison.Ordinal);
+        var type = Type.GetType(name);
+
+        if (type != null)
+        {
+            return (Control)Activator.CreateInstance(type)!;
+        }
+
+        return new TextBlock { Text = "Not Found: " + name };
+    }
+
+    public bool Match(object? data)
+    {
+        return data is ViewModelBase;
+    }
+}

Photos/ViewModels/MainWindowViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Diagnostics;
+using System.Net;
+using Avalonia.Controls;
+using Avalonia.Input;
+using Photos.Models;
+using Avalonia.Platform.Storage;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using Avalonia.Threading;
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace Photos.ViewModels;
+
+public partial class MainWindowViewModel : ViewModelBase
+{
+    public ObservableCollection<Photo> Photos { get; private set; } = [];
+
+    [ObservableProperty] private Photo? _selectedPhoto;
+
+    public string LibraryPath { get; private set; } = string.Empty;
+    
+    public MainWindowViewModel()
+    {
+        
+    }
+
+    void OpenDirectory()
+    {
+
+    }
+
+    private void SanitizeFiles(List<string> files, IEnumerable<string> extensions)
+    => files.RemoveAll(x => !extensions.Any(ex => x.EndsWith(ex, StringComparison.OrdinalIgnoreCase)));
+
+    private async Task AddPhotosAsync(string path)
+    {
+        try
+        {
+            var files = await Task.Run(() =>
+            {
+                var files = Directory.GetFiles(path, "*", SearchOption.AllDirectories).ToList();
+                SanitizeFiles(files, [".png", ".jpg", ".jpeg"]);
+                return files;
+            });
+
+            var photosToAdd = await Task.Run(() =>
+            {
+                var photos = new List<Photo>();
+                foreach (var file in files)
+                {
+                    photos.Add(new Photo(file, LibraryPath));
+                }
+                return photos;
+            });
+
+            await Dispatcher.UIThread.InvokeAsync(() =>
+            {
+                foreach (var photo in photosToAdd) Photos.Add(photo);
+            });
+        }
+        catch (Exception ex)
+        {
+            Debug.WriteLine(ex);
+        }
+    }
+
+    public async void WindowDropHandler(DragEventArgs e)
+    {
+        var files = e.DataTransfer.TryGetFiles();
+        if (files is null || files.Length == 0) return;
+
+        var localPath = Path.GetDirectoryName(files[0].TryGetLocalPath());
+        if (String.IsNullOrWhiteSpace(localPath)) return;
+
+        LibraryPath = localPath;
+        Photos.Clear();
+
+        await AddPhotosAsync(localPath);
+    }
+
+    public void PhotoClicked(PointerReleasedEventArgs e)
+    {
+        if(e.Source is not Image img) return;
+        SelectedPhoto = Photos.FirstOrDefault(x => x.Source == img.Source);
+    }
+
+    public void SelectedPhotoClicked()
+    {
+        SelectedPhoto = null;
+    }
+}

Photos/ViewModels/ViewModelBase.cs

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+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace Photos.ViewModels;
+
+public abstract class ViewModelBase : ObservableObject
+{
+}

Photos/Views/MainWindow.axaml

@@ -0,0 +1,62 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="using:Photos.ViewModels"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:i="using:Avalonia.Xaml.Interactivity"
+        xmlns:ic="using:Avalonia.Xaml.Interactions.Core"
+        xmlns:models="using:Photos.Models"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="Photos.Views.MainWindow"
+        x:DataType="vm:MainWindowViewModel"
+        x:Name="Root"
+        Icon="/Assets/avalonia-logo.ico"
+        Title="Photos"
+        DragDrop.AllowDrop="True"
+        DragDrop.Drop="DropHandler"
+        >
+
+    <Design.DataContext>
+        <!-- This only sets the DataContext for the previewer in an IDE,
+             to set the actual DataContext for runtime, set the DataContext property in code (look at App.axaml.cs) -->
+        <vm:MainWindowViewModel/>
+    </Design.DataContext>
+
+    <Grid ColumnDefinitions="1*, 5*" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
+        <Menu>
+            <Button Content="Open Directory" Command="{Binding OpenDirectory}"/>
+        </Menu>
+        <ScrollViewer Grid.Column="1">
+            <ItemsControl ItemsSource="{Binding Photos}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
+                <ItemsControl.ItemsPanel>
+                    <ItemsPanelTemplate>
+                        <WrapPanel ScrollViewer.VerticalScrollBarVisibility="Auto"/>
+                    </ItemsPanelTemplate>
+                </ItemsControl.ItemsPanel>
+                <ItemsControl.ItemTemplate>
+                    <DataTemplate DataType="models:Photo">
+                        <StackPanel Orientation="Vertical" Margin="20">
+                            <i:Interaction.Behaviors>
+                                <ic:EventTriggerBehavior EventName="PointerReleased">
+                                    <ic:InvokeCommandAction Command="{Binding DataContext.PhotoClicked, ElementName=Root}" PassEventArgsToCommand="True"/>
+                                </ic:EventTriggerBehavior>
+                            </i:Interaction.Behaviors>
+                            <Image Source="{Binding Source}" Width="150" Height="150"/>
+                            <TextBlock Text="{Binding DisplayName}" HorizontalAlignment="Center" Width="150"/>
+                            <TextBlock Text="{Binding DisplayPath}" HorizontalAlignment="Center" Width="150"/>
+                        </StackPanel>
+                    </DataTemplate>
+                </ItemsControl.ItemTemplate>
+            </ItemsControl>
+        </ScrollViewer>
+        <Grid Grid.Column="0" Grid.ColumnSpan="2" IsEnabled="{Binding SelectedPhoto}">
+            <Image Source="{Binding SelectedPhoto.Source}" Margin="50">
+                <i:Interaction.Behaviors>
+                    <ic:EventTriggerBehavior EventName="PointerReleased">
+                        <ic:InvokeCommandAction Command="{Binding Path=SelectedPhotoClicked}"/>
+                    </ic:EventTriggerBehavior>
+                </i:Interaction.Behaviors>
+            </Image>
+        </Grid>
+    </Grid>
+</Window>

Photos/Views/MainWindow.axaml.cs

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+using Avalonia.Controls;
+using Avalonia.Input;
+using Avalonia.Xaml.Interactions.DragAndDrop;
+using Photos.ViewModels;
+
+namespace Photos.Views;
+
+public partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+        DataContext = new MainWindowViewModel();
+    }
+
+    public void DropHandler(object sender, DragEventArgs e)
+    {
+        (DataContext as MainWindowViewModel)?.WindowDropHandler(e);
+    }
+}

Photos/app.manifest

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+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <!-- This manifest is used on Windows only.
+       Don't remove it as it might cause problems with window transparency and embedded controls.
+       For more details visit https://learn.microsoft.com/en-us/windows/win32/sbscs/application-manifests -->
+  <assemblyIdentity version="1.0.0.0" name="Photos.Desktop"/>
+
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- A list of the Windows versions that this application has been tested on
+           and is designed to work with. Uncomment the appropriate elements
+           and Windows will automatically select the most compatible environment. -->
+
+      <!-- Windows 10 -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+    </application>
+  </compatibility>
+</assembly>