first commit

Library/PackageCache/com.unity.timeline@1.7.6/Editor/treeview/Drawers/TrackItemsDrawer.cs

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+using System.Collections.Generic;
+using UnityEngine;
+
+namespace UnityEditor.Timeline
+{
+    struct TrackItemsDrawer
+    {
+        List<ILayer> m_Layers;
+        ClipsLayer m_ClipsLayer;
+
+        public List<TimelineClipGUI> clips => m_ClipsLayer.items;
+
+        public TrackItemsDrawer(IRowGUI parent)
+        {
+            m_Layers = null;
+            m_ClipsLayer = null;
+            BuildGUICache(parent);
+        }
+
+        void BuildGUICache(IRowGUI parent)
+        {
+            m_ClipsLayer = new ClipsLayer(Layer.Clips, parent);
+            m_Layers = new List<ILayer>
+            {
+                m_ClipsLayer,
+                new MarkersLayer(Layer.Markers, parent)
+            };
+        }
+
+        public void Draw(Rect rect, WindowState state)
+        {
+            foreach (var layer in m_Layers)
+            {
+                layer.Draw(rect, state);
+            }
+        }
+    }
+}