Add progress indicator in editor for assets loading

Source/Editor/Modules/ProgressReportingModule.cs

@@ -56,6 +56,11 @@ namespace FlaxEditor.Modules
         /// </summary>
         public readonly GenerateScriptsProjectFilesProgress GenerateScriptsProjectFiles = new GenerateScriptsProjectFilesProgress();
 
+        /// <summary>
+        /// The assets loading progress handler.
+        /// </summary>
+        public readonly LoadAssetsProgress LoadAssets = new LoadAssetsProgress();
+
         /// <summary>
         /// Gets the first active handler.
         /// </summary>
@@ -80,6 +85,7 @@ namespace FlaxEditor.Modules
             RegisterHandler(CodeEditorOpen);
             RegisterHandler(NavMeshBuilding);
             RegisterHandler(GenerateScriptsProjectFiles);
+            RegisterHandler(LoadAssets);
         }
 
         /// <summary>

Source/Editor/Progress/Handlers/LoadAssetsProgress.cs

@@ -0,0 +1,40 @@
+// Copyright (c) 2012-2024 Wojciech Figat. All rights reserved.
+
+namespace FlaxEditor.Progress.Handlers
+{
+    /// <summary>
+    /// Loading assets progress reporting handler.
+    /// </summary>
+    /// <seealso cref="FlaxEditor.Progress.ProgressHandler" />
+    public sealed class LoadAssetsProgress : ProgressHandler
+    {
+        private int _loadingAssetsCount;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="LoadAssetsProgress"/> class.
+        /// </summary>
+        public LoadAssetsProgress()
+        {
+            Editor.Instance.EditorUpdate += OnEditorUpdate;
+        }
+
+        private void OnEditorUpdate()
+        {
+            var contentStats = FlaxEngine.Content.Stats;
+            if (_loadingAssetsCount == contentStats.LoadingAssetsCount)
+                return;
+
+            if (contentStats.LoadingAssetsCount == 0)
+                OnEnd();
+            else if (_loadingAssetsCount == 0)
+                OnStart();
+            if (contentStats.LoadingAssetsCount > 0)
+            {
+                var progress = (float)contentStats.LoadedAssetsCount / contentStats.AssetsCount;
+                var text = contentStats.LoadingAssetsCount == 1 ? "Loading 1 asset..." : $"Loading {contentStats.LoadingAssetsCount} assets...";
+                OnUpdate(progress, text);
+            }
+            _loadingAssetsCount = contentStats.LoadingAssetsCount;
+        }
+    }
+}