Layer effects - Fixed placeholder system

src/Artemis.Core/Plugins/LayerEffects/Internal/BaseLayerEffect.cs

@@ -164,12 +164,7 @@ public abstract class BaseLayerEffect : BreakableModel, IDisposable, IStorageMod
     // Not only is this needed to initialize properties on the layer effects, it also prevents implementing anything
     // but LayerEffect<T> outside the core
     internal abstract void Initialize();
-
-    internal virtual string GetEffectTypeName()
-    {
-        return GetType().Name;
-    }
-
+    
     internal void InternalUpdate(Timeline timeline)
     {
         BaseProperties?.Update(timeline);
@@ -220,20 +215,23 @@ public abstract class BaseLayerEffect : BreakableModel, IDisposable, IStorageMod
     /// <inheritdoc />
     public void Load()
     {
-        HasBeenRenamed = LayerEffectEntity.HasBeenRenamed;
         Name = HasBeenRenamed ? LayerEffectEntity.Name : Descriptor.DisplayName;
+        HasBeenRenamed = LayerEffectEntity.HasBeenRenamed;
         Order = LayerEffectEntity.Order;
     }
 
     /// <inheritdoc />
     public void Save()
     {
-        LayerEffectEntity.ProviderId = Descriptor.Provider.Id;
-        LayerEffectEntity.EffectType = GetType().FullName;
         LayerEffectEntity.Name = Name;
         LayerEffectEntity.HasBeenRenamed = HasBeenRenamed;
         LayerEffectEntity.Order = Order;
 
+        if (Descriptor.IsPlaceholder)
+            return;
+
+        LayerEffectEntity.ProviderId = Descriptor.Provider.Id;
+        LayerEffectEntity.EffectType = GetType().FullName;
         BaseProperties?.ApplyToEntity();
         LayerEffectEntity.PropertyGroup = BaseProperties?.PropertyGroupEntity;
     }

src/Artemis.Core/Plugins/LayerEffects/LayerEffectDescriptor.cs

@@ -19,9 +19,9 @@ public class LayerEffectDescriptor
         Provider = provider ?? throw new ArgumentNullException(nameof(provider));
     }
 
-    internal LayerEffectDescriptor(string placeholderFor, LayerEffectProvider provider)
+    private LayerEffectDescriptor(LayerEffectProvider provider)
     {
-        PlaceholderFor = placeholderFor ?? throw new ArgumentNullException(nameof(placeholderFor));
+        IsPlaceholder = true;
         Provider = provider ?? throw new ArgumentNullException(nameof(provider));
         DisplayName = "Missing effect";
         Description = "This effect could not be loaded";
@@ -55,16 +55,21 @@ public class LayerEffectDescriptor
     public LayerEffectProvider Provider { get; }
 
     /// <summary>
-    ///     Gets the GUID this descriptor is acting as a placeholder for. If null, this descriptor is not a placeholder
+    /// Gets a boolean indicating whether this descriptor is a placeholder descriptor.
     /// </summary>
-    public string? PlaceholderFor { get; }
+    public bool IsPlaceholder { get; }
+    
+    internal static LayerEffectDescriptor CreatePlaceholder(LayerEffectProvider provider)
+    {
+        return new LayerEffectDescriptor(provider);
+    }
 
     /// <summary>
     ///     Creates an instance of the described effect and applies it to the render element
     /// </summary>
     public BaseLayerEffect CreateInstance(RenderProfileElement renderElement, LayerEffectEntity? entity)
     {
-        if (PlaceholderFor != null)
+        if (IsPlaceholder)
         {
             if (entity == null)
                 throw new ArtemisCoreException("Cannot create a placeholder for a layer effect that wasn't loaded from an entity");
@@ -97,10 +102,10 @@ public class LayerEffectDescriptor
 
     private BaseLayerEffect CreatePlaceHolderInstance(RenderProfileElement renderElement, LayerEffectEntity entity)
     {
-        if (PlaceholderFor == null)
+        if (!IsPlaceholder)
             throw new ArtemisCoreException("Cannot create a placeholder instance using a layer effect descriptor that is not a placeholder for anything");
 
-        PlaceholderLayerEffect effect = new(entity, PlaceholderFor)
+        PlaceholderLayerEffect effect = new(entity)
         {
             ProfileElement = renderElement,
             Descriptor = this

src/Artemis.Core/Plugins/LayerEffects/Placeholder/PlaceholderLayerEffect.cs

@@ -8,10 +8,9 @@ namespace Artemis.Core.LayerEffects.Placeholder;
 /// </summary>
 internal class PlaceholderLayerEffect : LayerEffect<PlaceholderProperties>
 {
-    internal PlaceholderLayerEffect(LayerEffectEntity originalEntity, string placeholderFor)
+    internal PlaceholderLayerEffect(LayerEffectEntity originalEntity)
     {
         OriginalEntity = originalEntity;
-        PlaceholderFor = placeholderFor;
 
         LayerEffectEntity = originalEntity;
         Order = OriginalEntity.Order;
@@ -19,8 +18,6 @@ internal class PlaceholderLayerEffect : LayerEffect<PlaceholderProperties>
         HasBeenRenamed = OriginalEntity.HasBeenRenamed;
     }
 
-    public string PlaceholderFor { get; }
-
     internal LayerEffectEntity OriginalEntity { get; }
 
     /// <inheritdoc />
@@ -47,11 +44,6 @@ internal class PlaceholderLayerEffect : LayerEffect<PlaceholderProperties>
     public override void PostProcess(SKCanvas canvas, SKRect bounds, SKPaint paint)
     {
     }
-
-    internal override string GetEffectTypeName()
-    {
-        return OriginalEntity.EffectType;
-    }
 }
 
 /// <summary>

src/Artemis.Core/Plugins/LayerEffects/Placeholder/PlaceholderLayerEffectDescriptor.cs

@@ -2,9 +2,9 @@
 
 internal static class PlaceholderLayerEffectDescriptor
 {
-    public static LayerEffectDescriptor Create(string missingProviderId)
+    public static LayerEffectDescriptor Create()
     {
-        LayerEffectDescriptor descriptor = new(missingProviderId, Constants.EffectPlaceholderPlugin);
+        LayerEffectDescriptor descriptor = LayerEffectDescriptor.CreatePlaceholder(Constants.EffectPlaceholderPlugin);
         return descriptor;
     }
 }