Add support for custom file proxies in Editor

Source/Editor/Content/Proxy/AssetProxy.cs

@@ -30,9 +30,7 @@ namespace FlaxEditor.Content
         /// <summary>
         /// Determines whether [is virtual proxy].
         /// </summary>
-        /// <returns>
-        ///   <c>true</c> if [is virtual proxy]; otherwise, <c>false</c>.
-        /// </returns>
+        /// <returns><c>true</c> if [is virtual proxy]; otherwise, <c>false</c>.</returns>
         public bool IsVirtualProxy()
         {
             return IsVirtual && CanExport == false;

Source/Editor/Content/Proxy/CSharpScriptProxy.cs

@@ -29,6 +29,12 @@ namespace FlaxEditor.Content
             return item is CSharpScriptItem;
         }
 
+        /// <inheritdoc />
+        public override ContentItem ConstructItem(string path)
+        {
+            return new CSharpScriptItem(path);
+        }
+
         /// <inheritdoc />
         public override void Create(string outputPath, object arg)
         {

Source/Editor/Content/Proxy/ContentProxy.cs

@@ -39,6 +39,16 @@ namespace FlaxEditor.Content
             return false;
         }
 
+        /// <summary>
+        /// Constructs the item for the file.
+        /// </summary>
+        /// <param name="path">The file path.</param>
+        /// <returns>Created item or null.</returns>
+        public virtual ContentItem ConstructItem(string path)
+        {
+            return null;
+        }
+
         /// <summary>
         /// Gets a value indicating whether this proxy if for assets.
         /// </summary>

Source/Editor/Content/Proxy/CppProxy.cs

@@ -87,6 +87,12 @@ namespace FlaxEditor.Content
             return item is CppScriptItem;
         }
 
+        /// <inheritdoc />
+        public override ContentItem ConstructItem(string path)
+        {
+            return new CppScriptItem(path);
+        }
+
         /// <inheritdoc />
         protected override void GetTemplatePaths(out string headerTemplate, out string sourceTemplate)
         {

Source/Editor/Content/Proxy/FileProxy.cs

@@ -20,6 +20,12 @@ namespace FlaxEditor.Content
             return item is FileItem;
         }
 
+        /// <inheritdoc />
+        public override ContentItem ConstructItem(string path)
+        {
+            return new FileItem(path);
+        }
+
         /// <inheritdoc />
         public override string FileExtension => string.Empty;
 

Source/Editor/Modules/ContentDatabaseModule.cs

@@ -129,12 +129,9 @@ namespace FlaxEditor.Modules
                 for (int i = 0; i < Proxy.Count; i++)
                 {
                     if (Proxy[i].IsProxyFor(item))
-                    {
                         return Proxy[i];
-                    }
                 }
             }
-
             return null;
         }
 
@@ -147,11 +144,8 @@ namespace FlaxEditor.Modules
             for (int i = 0; i < Proxy.Count; i++)
             {
                 if (Proxy[i].IsProxyFor<T>())
-                {
                     return Proxy[i];
-                }
             }
-
             return null;
         }
 
@@ -164,17 +158,12 @@ namespace FlaxEditor.Modules
         {
             if (string.IsNullOrEmpty(extension))
                 throw new ArgumentNullException();
-
             extension = StringUtils.NormalizeExtension(extension);
-
             for (int i = 0; i < Proxy.Count; i++)
             {
-                if (Proxy[i].FileExtension == extension)
-                {
+                if (string.Equals(Proxy[i].FileExtension, extension, StringComparison.Ordinal))
                     return Proxy[i];
-                }
             }
-
             return null;
         }
 
@@ -189,30 +178,23 @@ namespace FlaxEditor.Modules
             for (int i = 0; i < Proxy.Count; i++)
             {
                 if (Proxy[i] is AssetProxy proxy && proxy.AcceptsAsset(typeName, path))
-                {
                     return proxy;
-                }
             }
-
             return null;
         }
+
         /// <summary>
         /// Gets the virtual proxy object from given path.
-        /// <br></br>use case if the asset u trying to display is not a flax asset but u like to add custom functionality
-        /// <br></br>to context menu,or display it the asset
         /// </summary>
         /// <param name="path">The asset path.</param>
         /// <returns>Asset proxy or null if cannot find.</returns>
-        public AssetProxy GetAssetVirtuallProxy(string path)
+        public AssetProxy GetAssetVirtualProxy(string path)
         {
             for (int i = 0; i < Proxy.Count; i++)
             {
                 if (Proxy[i] is AssetProxy proxy && proxy.IsVirtualProxy() && path.EndsWith(proxy.FileExtension, StringComparison.OrdinalIgnoreCase))
-                {
                     return proxy;
-                }
             }
-
             return null;
         }
 
@@ -1016,11 +998,13 @@ namespace FlaxEditor.Modules
                     }
                     if (item == null)
                     {
-                        var proxy = GetAssetVirtuallProxy(path);
+                        var proxy = GetAssetVirtualProxy(path);
                         item = proxy?.ConstructItem(path, assetInfo.TypeName, ref assetInfo.ID);
                         if (item == null)
                         {
-                            item = new FileItem(path);
+                            item = GetProxy(Path.GetExtension(path))?.ConstructItem(path);
+                            if (item == null)
+                                item = new FileItem(path);
                         }
                     }