consist editor improvements

StarterNG/App.axaml.cs

@@ -1,10 +1,14 @@
 using System;
 using System.Globalization;
 using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
 using Avalonia;
 using Avalonia.Controls.ApplicationLifetimes;
 using Avalonia.Markup.Xaml;
 using Avalonia.Markup.Xaml.Styling;
+using Avalonia.Threading;
+using StarterNG.Classes;
 using StarterNG.Services;
 
 namespace StarterNG;
@@ -54,7 +58,30 @@ public partial class App : Application
     {
         if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
         {
-            desktop.MainWindow = new MainWindow();
+            // Code page 1250 is needed to parse scenery files (done during load).
+            Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
+
+            var splash = new SplashWindow();
+            desktop.MainWindow = splash;
+            splash.Show();
+
+            // Progress<T> marshals callbacks back to this (UI) thread.
+            var progress = new Progress<LoadStatus>(splash.Report);
+
+            Task.Run(async () =>
+            {
+                GameData.Instance.Load(progress);
+                await Task.Delay(400); // let the completed bar be visible briefly
+            }).ContinueWith(_ =>
+            {
+                Dispatcher.UIThread.Post(() =>
+                {
+                    var main = new MainWindow();
+                    desktop.MainWindow = main;   // keep a main window before closing the splash
+                    main.Show();
+                    splash.Close();
+                });
+            });
         }
 
         base.OnFrameworkInitializationCompleted();

StarterNG/Assets/Langs/English.axaml

@@ -33,11 +33,36 @@
     <x:String x:Key="CatDMU">DMU</x:String>
     <x:String x:Key="CatCarriagesA">Carriages A</x:String>
     <x:String x:Key="CatCarriagesB">Carriages B</x:String>
+    <x:String x:Key="CatElectricLoco">Electric locomotive</x:String>
+    <x:String x:Key="CatDieselLoco">Diesel locomotive</x:String>
+    <x:String x:Key="CatSteamLoco">Steam locomotive</x:String>
+    <x:String x:Key="CatRailbus">Railbus</x:String>
+    <x:String x:Key="CatDraisine">Draisine</x:String>
+    <x:String x:Key="CatWork">Work vehicles</x:String>
+    <x:String x:Key="CatPrototype">Prototype</x:String>
+    <x:String x:Key="CatTram">Tram</x:String>
+    <x:String x:Key="CatCar">Car</x:String>
+    <x:String x:Key="CatBus">Bus</x:String>
+    <x:String x:Key="CatTruck">Truck</x:String>
+    <x:String x:Key="CatPeople">People</x:String>
+    <x:String x:Key="CatAnimals">Animals</x:String>
+    <x:String x:Key="CatWagons">Wagons</x:String>
+    <x:String x:Key="CatOther">Other</x:String>
     <x:String x:Key="Brakes">Brakes</x:String>
     <x:String x:Key="Loads">Loads</x:String>
     <x:String x:Key="Coupling">Coupling</x:String>
     <x:String x:Key="SelectVehicleHint">Select a vehicle in the consist to edit it.</x:String>
     <x:String x:Key="ComingSoon">Editing options coming soon.</x:String>
+    <x:String x:Key="Split">Split</x:String>
+    <x:String x:Key="TipSplit">Split the unit into individual cars</x:String>
+    <x:String x:Key="AddVehicle">Add</x:String>
+    <x:String x:Key="TipAddVehicle">Add this vehicle to the consist</x:String>
+    <x:String x:Key="TipAddUnit">Add the whole unit to the consist</x:String>
+
+    <!-- Loading splash -->
+    <x:String x:Key="LoadingVehicles">Loading vehicle database</x:String>
+    <x:String x:Key="LoadingSceneries">Loading sceneries</x:String>
+    <x:String x:Key="LoadingDone">Starting…</x:String>
 
     <!-- Settings -->
    <x:String x:Key="General">General</x:String>

StarterNG/Assets/Langs/Polski.axaml

@@ -33,11 +33,36 @@
     <x:String x:Key="CatDMU">SZT</x:String>
     <x:String x:Key="CatCarriagesA">Wagony A</x:String>
     <x:String x:Key="CatCarriagesB">Wagony B</x:String>
+    <x:String x:Key="CatElectricLoco">Lokomotywa elektryczna</x:String>
+    <x:String x:Key="CatDieselLoco">Lokomotywa spalinowa</x:String>
+    <x:String x:Key="CatSteamLoco">Parowóz</x:String>
+    <x:String x:Key="CatRailbus">Szynobus</x:String>
+    <x:String x:Key="CatDraisine">Drezyna</x:String>
+    <x:String x:Key="CatWork">Pojazdy robocze</x:String>
+    <x:String x:Key="CatPrototype">Prototyp</x:String>
+    <x:String x:Key="CatTram">Tramwaj</x:String>
+    <x:String x:Key="CatCar">Samochód osobowy</x:String>
+    <x:String x:Key="CatBus">Autobus</x:String>
+    <x:String x:Key="CatTruck">Samochód ciężarowy</x:String>
+    <x:String x:Key="CatPeople">Ludzie</x:String>
+    <x:String x:Key="CatAnimals">Zwierzęta</x:String>
+    <x:String x:Key="CatWagons">Wagony</x:String>
+    <x:String x:Key="CatOther">Inne</x:String>
     <x:String x:Key="Brakes">Hamulce</x:String>
     <x:String x:Key="Loads">Ładunki</x:String>
     <x:String x:Key="Coupling">Sprzęg</x:String>
     <x:String x:Key="SelectVehicleHint">Wybierz pojazd w składzie, aby go edytować.</x:String>
     <x:String x:Key="ComingSoon">Opcje edycji wkrótce.</x:String>
+    <x:String x:Key="Split">Rozdziel</x:String>
+    <x:String x:Key="TipSplit">Rozdziel zespół na pojedyncze człony</x:String>
+    <x:String x:Key="AddVehicle">Dodaj</x:String>
+    <x:String x:Key="TipAddVehicle">Dodaj ten pojazd do składu</x:String>
+    <x:String x:Key="TipAddUnit">Dodaj cały zespół do składu</x:String>
+
+    <!-- Ekran ładowania -->
+    <x:String x:Key="LoadingVehicles">Wczytywanie bazy pojazdów</x:String>
+    <x:String x:Key="LoadingSceneries">Wczytywanie scenerii</x:String>
+    <x:String x:Key="LoadingDone">Uruchamianie…</x:String>
 
     <!-- Ustawienia -->
     <x:String x:Key="General">Ogólne</x:String>

StarterNG/Classes/AppState.cs

@@ -0,0 +1,15 @@
+namespace StarterNG.Classes;
+
+/// <summary>
+/// Shared selection state across views: the scenery and trainset currently in
+/// focus. The depot edits this trainset in place, so changes made in the depot
+/// are reflected on the scenery (both views share the same Scenery/Trainset
+/// objects from <see cref="GameData"/>).
+/// </summary>
+public sealed class AppState
+{
+    public static AppState Instance { get; } = new();
+
+    public Scenery? CurrentScenery { get; set; }
+    public Trainset? CurrentTrainset { get; set; }
+}

StarterNG/Classes/GameData.cs

@@ -0,0 +1,83 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+
+namespace StarterNG.Classes;
+
+public enum LoadPhase
+{
+    Vehicles,
+    Sceneries,
+    Done
+}
+
+/// <summary>A single progress update emitted while the game data loads.</summary>
+public readonly record struct LoadStatus(double Fraction, LoadPhase Phase, string? Detail);
+
+/// <summary>
+/// Loads and holds the data shared across the launcher (vehicle database and
+/// parsed sceneries) so it is parsed once, at startup, behind the splash —
+/// instead of inside each view's constructor.
+/// </summary>
+public sealed class GameData
+{
+    public static GameData Instance { get; } = new();
+
+    public VehicleDatabase Vehicles { get; } = new();
+    public List<Scenery> Sceneries { get; } = new();
+
+    public bool Loaded { get; private set; }
+
+    /// <summary>
+    /// Parses the vehicle database and all sceneries, reporting progress.
+    /// Runs synchronously; call it from a background thread. Never throws.
+    /// </summary>
+    public void Load(IProgress<LoadStatus>? progress = null,
+                     string vehiclesDir = "databases/vehicles/",
+                     string sceneryDir = "scenery/")
+    {
+        if (Loaded)
+            return;
+
+        var vehicleFiles = VehicleDatabase.EnumerateFiles(vehiclesDir);
+        var scnFiles = EnumerateScenery(sceneryDir);
+        int total = Math.Max(1, vehicleFiles.Count + scnFiles.Count);
+        int done = 0;
+
+        // Phase 1 - vehicle database
+        Vehicles.BeginLoad();
+        foreach (string file in vehicleFiles)
+        {
+            progress?.Report(new LoadStatus((double)done / total, LoadPhase.Vehicles,
+                Path.GetFileName(file)));
+            try { Vehicles.LoadFile(file); }
+            catch { /* skip malformed file */ }
+            done++;
+        }
+        Vehicles.EndLoad();
+
+        // Phase 2 - sceneries
+        foreach (string file in scnFiles)
+        {
+            progress?.Report(new LoadStatus((double)done / total, LoadPhase.Sceneries,
+                Path.GetFileName(file)));
+            try { Sceneries.Add(new Scenery(file)); }
+            catch { /* skip unreadable scenery */ }
+            done++;
+        }
+
+        progress?.Report(new LoadStatus(1.0, LoadPhase.Done, null));
+        Loaded = true;
+    }
+
+    private static List<string> EnumerateScenery(string sceneryDir)
+    {
+        if (!Directory.Exists(sceneryDir))
+            return new List<string>();
+
+        return Directory.GetFiles(sceneryDir, "*.scn")
+            .Where(p => !Path.GetFileName(p).StartsWith("$"))
+            .ToList();
+    }
+}

StarterNG/Classes/Scenery.cs

@@ -11,6 +11,11 @@ public class Scenery
     public List<Trainset> Trainsets;
     public string Group;
     public string Path;
+
+    // The file content with each trainset block replaced by a {{i}} placeholder,
+    // used to rebuild the .scn on export.
+    private readonly string _template;
+
     public Scenery(string path)
     {
         this.Path = path;
@@ -41,18 +46,23 @@ public class Scenery
             trainsetEntries.Add(match.Value);
             return $"{{{{{idx++}}}}}";
         });
+        _template = content;
 
+        // 1:1 with placeholders - the Trainset ctor never throws (unparsable
+        // blocks are kept verbatim), so indices stay aligned for export.
         foreach (string trainsetEntry in trainsetEntries)
-        {
-            try
-            {
-                Trainsets.Add(new Trainset(trainsetEntry));
-            }
-            catch
-            {
-                // skip malformed trainset entries so one bad scenery
-                // doesn't break loading the rest
-            }
-        }
+            Trainsets.Add(new Trainset(trainsetEntry));
+    }
+
+    /// <summary>
+    /// Rebuilds the full .scn content with the (possibly modified) trainsets
+    /// substituted back into their original positions.
+    /// </summary>
+    public string BuildExportContent()
+    {
+        string result = _template;
+        for (int i = 0; i < Trainsets.Count; i++)
+            result = result.Replace("{{" + i + "}}", Trainsets[i].ToSceneryEntry());
+        return result;
     }
 }

StarterNG/Classes/Settings.cs

@@ -0,0 +1,51 @@
+namespace StarterNG.Classes;
+
+/// <summary>
+/// Application settings backing the Settings view. Load/Save are stubs for now;
+/// the real persistence will be implemented later.
+/// </summary>
+public sealed class Settings
+{
+    public static Settings Instance { get; } = new();
+
+    // General
+    public string Language = "English";
+    public bool Fullscreen;
+    public bool PauseWhenInactive;
+    public bool PauseOnStart;
+    public int CursorSensitivity = 3;
+    public bool InvertMouseHorizontal;
+    public bool InvertMouseVertical;
+
+    // Other
+    public string ExecutablePath = "eu07.exe"; // game executable used to launch
+    public bool SelectExeAutomatically = true;
+    public bool DebugMode;
+    public bool VirtualShunting;
+
+    // Graphics (subset)
+    public string Resolution = "1280x720";
+    public bool VSync = true;
+    public bool RenderShadows = true;
+
+    // Sound
+    public bool SoundEnabled = true;
+    public int Volume = 100;
+
+    // Starter
+    public bool AutoCloseStarter;
+    public bool LargeThumbnails;
+    public bool AutoExpandSceneryTree;
+
+    /// <summary>Loads settings from disk. TODO: implement persistence.</summary>
+    public void Load()
+    {
+        // intentionally empty for now
+    }
+
+    /// <summary>Persists settings to disk. TODO: implement persistence.</summary>
+    public void Save()
+    {
+        // intentionally empty for now
+    }
+}

StarterNG/Classes/Trainset.cs

@@ -22,11 +22,31 @@ public class Trainset
     public float Velocity;
     public string Description;
     public List<Dynamic> Vehicles;
+
+    /// <summary>Original .scn text of this trainset block (incl. endtrainset).</summary>
+    public string RawEntry;
+
+    /// <summary>True if the block parsed cleanly; false blocks are exported verbatim.</summary>
+    public bool Parsed;
+
     public Trainset(string trainsetEntry)
     {
-
+        RawEntry = trainsetEntry;
         Vehicles = new List<Dynamic>();
         Description = "";
+        try
+        {
+            ParseEntry(trainsetEntry);
+            Parsed = true;
+        }
+        catch
+        {
+            Parsed = false;
+        }
+    }
+
+    private void ParseEntry(string trainsetEntry)
+    {
         List<string> tokens = Regex
             .Matches(trainsetEntry, @"/\*[\s\S]*?\*/|//[^\r\n]*|[^\s\r\n]+")
             .Select(m => m.Value)
@@ -113,6 +133,13 @@ public class Trainset
         }
     }
     
+    /// <summary>
+    /// The .scn text for this trainset for export. Unparsed blocks are written
+    /// back verbatim; parsed blocks are regenerated from the current vehicles.
+    /// </summary>
+    public string ToSceneryEntry() =>
+        Parsed ? GetTrainsetEntry() + "endtrainset\n" : RawEntry;
+
     public string GetTrainsetEntry()
     {
         string entry = "";
@@ -120,8 +147,8 @@ public class Trainset
         entry += "trainset ";
         entry += this.Name + " ";
         entry += this.Track + " ";
-        entry += this.Offset + " ";
-        entry += this.Velocity + " ";
+        entry += this.Offset.ToString(CultureInfo.InvariantCulture) + " ";
+        entry += this.Velocity.ToString(CultureInfo.InvariantCulture) + " ";
         entry += "\n";
         foreach (Dynamic vehicle in Vehicles)
         {

StarterNG/Classes/VehicleDatabase.cs

@@ -94,6 +94,12 @@ public class VehicleDatabase
     /// <summary>Texture-uuid -> automatic-consist set that contains it.</summary>
     public Dictionary<string, VehicleSet> SetByTextureUuid { get; } = new();
 
+    /// <summary>Texture-uuid -> texture (includes wrecks, so set refs resolve).</summary>
+    public Dictionary<string, VehicleTexture> TextureByUuid { get; } = new();
+
+    /// <summary>skinfile (without extension, lower-case) -> texture.</summary>
+    public Dictionary<string, VehicleTexture> TextureBySkin { get; } = new();
+
     private static readonly JsonSerializerOptions JsonOpts = new()
     {
         PropertyNameCaseInsensitive = true,
@@ -102,32 +108,55 @@ public class VehicleDatabase
     };
 
     /// <summary>
-    /// Loads the database. When a merged vehicles.json is present it is used,
-    /// otherwise every per-vehicle *.json file in the directory is read.
+    /// Loads the database in one call. When a merged vehicles.json is present
+    /// it is used, otherwise every per-vehicle *.json file is read.
     /// Never throws: unreadable files are skipped.
     /// </summary>
     public void Load(string directory = "databases/vehicles/")
+    {
+        BeginLoad();
+        foreach (string file in EnumerateFiles(directory))
+            LoadFile(file);
+        EndLoad();
+    }
+
+    /// <summary>Resets the aggregate before an incremental load.</summary>
+    public void BeginLoad()
     {
         Textures.Clear();
         GroupsById.Clear();
         Sets.Clear();
         SetByTextureUuid.Clear();
+        TextureByUuid.Clear();
+        TextureBySkin.Clear();
+    }
 
+    /// <summary>Finalises an incremental load (builds lookup indexes).</summary>
+    public void EndLoad() => BuildSetIndex();
+
+    /// <summary>
+    /// Files that make up the database: the merged vehicles.json if present,
+    /// otherwise every per-vehicle *.json. Used to drive load progress.
+    /// </summary>
+    public static List<string> EnumerateFiles(string directory = "databases/vehicles/")
+    {
         if (!Directory.Exists(directory))
-            return;
+            return new List<string>();
 
         string merged = Path.Combine(directory, "vehicles.json");
         if (File.Exists(merged))
-        {
-            LoadMerged(merged);
-        }
-        else
-        {
-            foreach (string file in Directory.GetFiles(directory, "*.json"))
-                LoadEntryFile(file);
-        }
+            return new List<string> { merged };
 
-        BuildSetIndex();
+        return Directory.GetFiles(directory, "*.json").ToList();
+    }
+
+    /// <summary>Ingests a single database file (merged or per-vehicle).</summary>
+    public void LoadFile(string file)
+    {
+        if (string.Equals(Path.GetFileName(file), "vehicles.json", StringComparison.OrdinalIgnoreCase))
+            LoadMerged(file);
+        else
+            LoadEntryFile(file);
     }
 
     private void LoadMerged(string file)
@@ -171,6 +200,12 @@ public class VehicleDatabase
 
         foreach (var texture in entry.Textures)
         {
+            // index every texture (wrecks too) so set / skin references resolve
+            if (!string.IsNullOrEmpty(texture.Uuid))
+                TextureByUuid[texture.Uuid!] = texture;
+            if (!string.IsNullOrEmpty(texture.Skinfile))
+                TextureBySkin.TryAdd(Path.GetFileNameWithoutExtension(texture.Skinfile).ToLowerInvariant(), texture);
+
             // skip wrecks from the standard browser list
             if (texture.Wreck) continue;
             Textures.Add(texture);
@@ -179,6 +214,25 @@ public class VehicleDatabase
         Sets.AddRange(entry.Sets);
     }
 
+    /// <summary>
+    /// If the texture belongs to an automatic-consist set, returns all of that
+    /// set's textures in their defined order; otherwise null.
+    /// </summary>
+    public List<VehicleTexture>? ResolveSet(VehicleTexture texture)
+    {
+        if (string.IsNullOrEmpty(texture.Uuid)) return null;
+        if (!SetByTextureUuid.TryGetValue(texture.Uuid!, out var set) || set.TextureRefs is null)
+            return null;
+
+        var cars = new List<VehicleTexture>();
+        foreach (string uuid in set.TextureRefs)
+        {
+            if (!string.IsNullOrEmpty(uuid) && TextureByUuid.TryGetValue(uuid, out var tex))
+                cars.Add(tex);
+        }
+        return cars.Count > 0 ? cars : null;
+    }
+
     private void BuildSetIndex()
     {
         foreach (var set in Sets)
@@ -192,14 +246,36 @@ public class VehicleDatabase
         }
     }
 
-    /// <summary>Best miniature name for a texture (texture_mini -> mini_ref -> group mini).</summary>
+    /// <summary>
+    /// Miniature name for a texture: the texture_mini property, but if no .bmp
+    /// for it exists, falls back to the mini of the group it belongs to.
+    /// </summary>
     public string? ResolveMiniName(VehicleTexture texture)
     {
-        if (!string.IsNullOrEmpty(texture.TextureMini)) return texture.TextureMini;
-        if (!string.IsNullOrEmpty(texture.MiniRef)) return texture.MiniRef;
-        if (texture.Group is not null && GroupsById.TryGetValue(texture.Group, out var grp))
+        if (!string.IsNullOrEmpty(texture.TextureMini) && MiniPath(texture.TextureMini) != null)
+            return texture.TextureMini;
+
+        if (texture.Group != null && GroupsById.TryGetValue(texture.Group, out var grp)
+            && !string.IsNullOrEmpty(grp.Mini))
             return grp.Mini;
-        return null;
+
+        return texture.TextureMini;
+    }
+
+    /// <summary>Resolved mini for a skin file (matched case-insensitively), or null.</summary>
+    public string? MiniForSkin(string? skinFile)
+    {
+        if (string.IsNullOrEmpty(skinFile)) return null;
+        string key = Path.GetFileNameWithoutExtension(skinFile).ToLowerInvariant();
+        return TextureBySkin.TryGetValue(key, out var tex) ? ResolveMiniName(tex) : null;
+    }
+
+    /// <summary>The texture for a skin file (matched case-insensitively), or null.</summary>
+    public VehicleTexture? TextureForSkin(string? skinFile)
+    {
+        if (string.IsNullOrEmpty(skinFile)) return null;
+        string key = Path.GetFileNameWithoutExtension(skinFile).ToLowerInvariant();
+        return TextureBySkin.TryGetValue(key, out var tex) ? tex : null;
     }
 
     /// <summary>Header label for the group a texture belongs to.</summary>
@@ -213,12 +289,30 @@ public class VehicleDatabase
         return groupId ?? "";
     }
 
-    /// <summary>Resolves a miniature .bmp path under textures/mini/, or null if missing.</summary>
+    // Case-insensitive index of mini .bmp files (built once).
+    private static Dictionary<string, string>? _miniIndex;
+
+    /// <summary>
+    /// Resolves a miniature .bmp path under textures/mini/ case-insensitively,
+    /// or null if missing. The directory is indexed once and reused.
+    /// </summary>
     public static string? MiniPath(string? miniName, string miniDir = "textures/mini/")
     {
         if (string.IsNullOrEmpty(miniName)) return null;
-        string path = Path.Combine(miniDir, miniName + ".bmp");
-        return File.Exists(path) ? path : null;
+
+        var index = _miniIndex ??= BuildMiniIndex(miniDir);
+        return index.TryGetValue(miniName!.ToLowerInvariant(), out var path) ? path : null;
+    }
+
+    private static Dictionary<string, string> BuildMiniIndex(string miniDir)
+    {
+        var index = new Dictionary<string, string>();
+        if (!Directory.Exists(miniDir))
+            return index;
+
+        foreach (string file in Directory.GetFiles(miniDir, "*.bmp"))
+            index[Path.GetFileNameWithoutExtension(file).ToLowerInvariant()] = file;
+        return index;
     }
 }
 

StarterNG/SplashWindow.axaml

@@ -0,0 +1,25 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:starterNg="clr-namespace:StarterNG"
+        x:Class="StarterNG.SplashWindow"
+        SystemDecorations="None"
+        CanResize="False"
+        ShowInTaskbar="True"
+        WindowStartupLocation="CenterScreen"
+        Width="520" Height="300"
+        Background="#15171B">
+    <Grid>
+        <Image Source="/Assets/Logo/splash.png" Stretch="UniformToFill" />
+
+        <Border VerticalAlignment="Bottom" Background="#CC0E0F12" Padding="18,12">
+            <StackPanel Spacing="8">
+                <TextBlock x:Name="statusText"
+                           Foreground="#EEEEEE" FontSize="12"
+                           TextTrimming="CharacterEllipsis"
+                           Text="{Binding [LoadingVehicles], Source={x:Static starterNg:App.Loc}}" />
+                <ProgressBar x:Name="progressBar"
+                             Minimum="0" Maximum="1" Value="0" Height="6" />
+            </StackPanel>
+        </Border>
+    </Grid>
+</Window>

StarterNG/SplashWindow.axaml.cs

@@ -0,0 +1,30 @@
+using Avalonia.Controls;
+using StarterNG.Classes;
+
+namespace StarterNG;
+
+public partial class SplashWindow : Window
+{
+    public SplashWindow()
+    {
+        InitializeComponent();
+    }
+
+    /// <summary>Updates the bar and status line. Must be called on the UI thread.</summary>
+    public void Report(LoadStatus status)
+    {
+        progressBar.Value = status.Fraction;
+        statusText.Text = Format(status);
+    }
+
+    private static string Format(LoadStatus s)
+    {
+        string detail = string.IsNullOrEmpty(s.Detail) ? "" : $": {s.Detail}";
+        return s.Phase switch
+        {
+            LoadPhase.Vehicles => App.Loc["LoadingVehicles"] + detail,
+            LoadPhase.Sceneries => App.Loc["LoadingSceneries"] + detail,
+            _ => App.Loc["LoadingDone"]
+        };
+    }
+}

StarterNG/StarterNG.csproj

@@ -41,6 +41,8 @@
       <AvaloniaResource Include="Assets\Logo\maszyna_white.svg" />
       <None Remove="Assets\Logo\Other\Discord.svg" />
       <AvaloniaResource Include="Assets\Logo\Other\Discord.svg" />
+      <None Remove="Assets\Logo\splash.png" />
+      <AvaloniaResource Include="Assets\Logo\splash.png" />
       <None Remove="Assets\Test\ep07p.bmp" />
       <AvaloniaResource Include="Assets\Test\ep07p.bmp" />
     </ItemGroup>

StarterNG/Views/Depot.axaml

@@ -4,6 +4,7 @@
              xmlns:sukiUi="clr-namespace:SukiUI.Controls;assembly=SukiUI"
              xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
              xmlns:starterNg="clr-namespace:StarterNG"
+             xmlns:views="clr-namespace:StarterNG.Views"
              mc:Ignorable="d" d:DesignWidth="1000" d:DesignHeight="700"
              x:Class="StarterNG.Views.Depot">
     <Grid Margin="16" ColumnSpacing="16" RowSpacing="16">
@@ -30,6 +31,8 @@
                 <TextBox Name="searchBox" DockPanel.Dock="Top" Margin="0,0,0,8"
                          Watermark="{Binding [Search], Source={x:Static starterNg:App.Loc}}"
                          TextChanged="SearchBox_OnTextChanged" />
+                <!-- Folded groups (built in code-behind); collapsed groups hold no
+                     controls, so the list stays light and scrolls smoothly. -->
                 <ScrollViewer VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Disabled">
                     <StackPanel Name="browserStack" Spacing="2" />
                 </ScrollViewer>
@@ -47,6 +50,7 @@
                 <ComboBox Name="sceneryConsistCombo" Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2"
                           HorizontalAlignment="Stretch" MaxDropDownHeight="420"
                           PlaceholderText="{Binding [LoadFromScenery], Source={x:Static starterNg:App.Loc}}"
+                          DropDownOpened="SceneryConsistCombo_OnDropDownOpened"
                           SelectionChanged="SceneryConsistCombo_OnSelectionChanged" />
             </Grid>
         </sukiUi:GroupBox>

StarterNG/Views/Scenarios.axaml

@@ -45,6 +45,7 @@
 
         <Button Grid.Column="0" Height="36" Classes="Flat"
                 VerticalAlignment="Bottom" Grid.Row="3" Grid.ColumnSpan="2"
+                Click="StartButton_OnClick"
                 Content="{Binding [Start], Source={x:Static starterNg:App.Loc}}">
 
         </Button>

StarterNG/Views/Scenarios.axaml.cs

@@ -1,8 +1,11 @@
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.IO;
 using System.Linq;
+using System.Text;
 using Avalonia;
 using Avalonia.Controls;
+using Avalonia.Interactivity;
 using Avalonia.Markup.Xaml;
 using Avalonia.Media.Imaging;
 using StarterNG.Classes;
@@ -16,19 +19,9 @@ public partial class Scenarios : UserControl
     public Scenarios()
     {
         InitializeComponent();
-        sceneries = new List<Scenery>();
 
-        // load sceneries
-        List<string> scnFiles = Directory.GetFiles("scenery/", "*.scn").ToList();
-        foreach (string scnFile in scnFiles)
-        {
-            // skip temp sceneries
-            if (Path.GetFileName(scnFile).StartsWith("$"))
-                continue;
-            
-            // Parse all files
-            sceneries.Add(new Scenery(scnFile));
-        }
+        // Sceneries are parsed once at startup (behind the splash).
+        sceneries = GameData.Instance.Sceneries;
 
         var groupNodes = new Dictionary<string, TreeViewItem>();
 
@@ -109,15 +102,18 @@ public partial class Scenarios : UserControl
         if (vItem?.Tag is not int vTag)
             return;
         Trainset selectedTrainset = selectedScn.Trainsets[vTag];
+
+        // share the selection so the depot edits this consist in place
+        AppState.Instance.CurrentScenery = selectedScn;
+        AppState.Instance.CurrentTrainset = selectedTrainset;
+
+        var db = GameData.Instance.Vehicles;
         foreach (var train in selectedTrainset.Vehicles)
         {
-            string path = Path.Combine(
-                "textures",
-                "mini",
-                train.SkinFile + ".bmp"
-            );
-
-            if (!File.Exists(path))
+            // thumbnail name comes from the matching texture's texture_mini
+            string miniName = db.MiniForSkin(train.SkinFile) ?? train.SkinFile;
+            string? path = VehicleDatabase.MiniPath(miniName);
+            if (path is null)
             {
                 // fallback
                 continue;
@@ -135,4 +131,46 @@ public partial class Scenarios : UserControl
         }
         missionDescription.Text = selectedTrainset.Description;
     }
+
+    // Exports the (possibly depot-modified) scenery to a $-prefixed copy and
+    // launches the game on it with the selected consist's driven vehicle.
+    private void StartButton_OnClick(object? sender, RoutedEventArgs e)
+    {
+        var scenery = AppState.Instance.CurrentScenery;
+        if (scenery is null)
+            return;
+        var trainset = AppState.Instance.CurrentTrainset;
+
+        // write scenery/$<name>.scn with the replaced trainsets
+        string dir = System.IO.Path.GetDirectoryName(scenery.Path) ?? "scenery";
+        string exportName = "$" + System.IO.Path.GetFileName(scenery.Path);
+        string exportPath = System.IO.Path.Combine(dir, exportName);
+        try
+        {
+            File.WriteAllText(exportPath, scenery.BuildExportContent(), Encoding.GetEncoding(1250));
+        }
+        catch
+        {
+            return; // couldn't write the scenery file
+        }
+
+        // the player's vehicle is the node name of the driven car in the consist
+        string? vehicle = trainset?.Vehicles
+            .FirstOrDefault(v => v.DriverType is eDriverType.Headdriver or eDriverType.Reardriver)?.Name
+            ?? trainset?.Vehicles.FirstOrDefault()?.Name;
+
+        // launch the game: -s $<name>.scn -v <vehicle>
+        try
+        {
+            Process.Start(new ProcessStartInfo(StarterNG.Classes.Settings.Instance.ExecutablePath)
+            {
+                Arguments = $"-s {exportName} -v {vehicle}",
+                UseShellExecute = true
+            });
+        }
+        catch
+        {
+            // executable not found / not configured yet
+        }
+    }
 }