Add displaying playback position of animation in Anim Graph window

Source/Editor/Surface/AnimGraphSurface.cs

@@ -113,6 +113,25 @@ namespace FlaxEditor.Surface
             ScriptsBuilder.ScriptsReloadBegin += OnScriptsReloadBegin;
         }
 
+        internal AnimGraphTraceEvent[] LastTraceEvents;
+
+        internal bool TryGetTraceEvent(SurfaceNode node, out AnimGraphTraceEvent traceEvent)
+        {
+            if (LastTraceEvents != null)
+            {
+                foreach (var e in LastTraceEvents)
+                {
+                    if (e.NodeId == node.ID)
+                    {
+                        traceEvent = e;
+                        return true;
+                    }
+                }
+            }
+            traceEvent = default;
+            return false;
+        }
+
         private static SurfaceStyle CreateStyle()
         {
             var editor = Editor.Instance;
@@ -383,6 +402,7 @@ namespace FlaxEditor.Surface
             }
             ScriptsBuilder.ScriptsReloadBegin -= OnScriptsReloadBegin;
             _nodesCache.Wait();
+            LastTraceEvents = null;
 
             base.OnDestroy();
         }

Source/Editor/Surface/Archetypes/Animation.cs

@@ -36,6 +36,7 @@ namespace FlaxEditor.Surface.Archetypes
         {
             private AssetSelect _assetSelect;
             private Box _assetBox;
+            private ProgressBar _playbackPos;
 
             /// <inheritdoc />
             public Sample(uint id, VisjectSurfaceContext context, NodeArchetype nodeArch, GroupArchetype groupArch)
@@ -93,6 +94,36 @@ namespace FlaxEditor.Surface.Archetypes
                 _assetSelect.Visible = !box.HasAnyConnection;
                 UpdateTitle();
             }
+
+            /// <inheritdoc />
+            public override void Update(float deltaTime)
+            {
+                // Debug current playback position
+                if (((AnimGraphSurface)Surface).TryGetTraceEvent(this, out var traceEvent) && traceEvent.Asset is FlaxEngine.Animation anim)
+                {
+                    if (_playbackPos == null)
+                    {
+                        _playbackPos = new ProgressBar
+                        {
+                            SmoothingScale = 0.0f,
+                            Offsets = Margin.Zero,
+                            AnchorPreset = AnchorPresets.HorizontalStretchBottom,
+                            Parent = this,
+                            Height = 12.0f,
+                        };
+                        _playbackPos.Y -= 16.0f;
+                    }
+                    _playbackPos.Visible = true;
+                    _playbackPos.Maximum = anim.Duration;
+                    _playbackPos.Value = traceEvent.Value; // AnimGraph reports position in animation frames, not time
+                }
+                else if (_playbackPos != null)
+                {
+                    _playbackPos.Visible = false;
+                }
+
+                base.Update(deltaTime);
+            }
         }
 
         /// <summary>

Source/Editor/Windows/Assets/AnimationGraphWindow.cs

@@ -396,6 +396,16 @@ namespace FlaxEditor.Windows.Assets
         /// <inheritdoc />
         public override void OnUpdate()
         {
+            // Extract animations playback state from the events tracing
+            var debugActor = _debugPicker.Value as AnimatedModel;
+            if (debugActor == null)
+                debugActor = _preview.PreviewActor;
+            if (debugActor != null)
+            {
+                debugActor.EnableTracing = true;
+                Surface.LastTraceEvents = debugActor.TraceEvents;
+            }
+
             base.OnUpdate();
 
             // Update graph execution flow debugging visualization
@@ -416,6 +426,8 @@ namespace FlaxEditor.Windows.Assets
         /// <inheritdoc />
         public override void OnDestroy()
         {
+            if (IsDisposing)
+                return;
             Animations.DebugFlow -= OnDebugFlow;
 
             _properties = null;