Add tooltips to actors in scene tree and to properties General panel header

#182

Source/Editor/CustomEditors/Dedicated/ActorEditor.cs

@@ -47,7 +47,8 @@ namespace FlaxEditor.CustomEditors.Dedicated
         public override void Initialize(LayoutElementsContainer layout)
         {
             // Check for prefab link
-            if (Values.IsSingleObject && Values[0] is Actor actor && actor.HasPrefabLink)
+            var actor = Values.Count == 1 ? Values[0] as Actor : null;
+            if (actor != null && actor.HasPrefabLink)
             {
                 // TODO: consider editing more than one instance of the same prefab asset at once
 
@@ -91,6 +92,8 @@ namespace FlaxEditor.CustomEditors.Dedicated
             {
                 if (layout.Children[i] is GroupElement group && group.Panel.HeaderText == "General")
                 {
+                    if (actor != null)
+                        group.Panel.TooltipText = Surface.SurfaceUtils.GetVisualScriptTypeDescription(TypeUtils.GetObjectType(actor));
                     const float settingsButtonSize = 14;
                     var settingsButton = new Image
                     {

Source/Editor/SceneGraph/GUI/ActorTreeNode.cs

@@ -201,6 +201,21 @@ namespace FlaxEditor.SceneGraph.GUI
             base.Update(deltaTime);
         }
 
+
+        /// <inheritdoc />
+        protected override bool ShowTooltip => true;
+
+        /// <inheritdoc />
+        public override bool OnShowTooltip(out string text, out Vector2 location, out Rectangle area)
+        {
+            // Evaluate tooltip text once it's actually needed
+            var actor = _actorNode.Actor;
+            if (string.IsNullOrEmpty(TooltipText) && actor)
+                TooltipText = Surface.SurfaceUtils.GetVisualScriptTypeDescription(TypeUtils.GetObjectType(actor));
+
+            return base.OnShowTooltip(out text, out location, out area);
+        }
+
         /// <inheritdoc />
         protected override Color CacheTextColor()
         {