1 files changed, 60 insertions, 0 deletions
diff --git a/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Utilities/StyleManager.cs b/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Utilities/StyleManager.cs
new file mode 100644
index 0000000..794fc68
--- /dev/null
+++ b/Library/PackageCache/com.unity.timeline@1.2.13/Editor/Utilities/StyleManager.cs
@@ -0,0 +1,60 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using UnityEditor.Experimental;
+using UnityEditor.StyleSheets;
+using UnityEngine;
+using UnityEngine.Timeline;
+
+namespace UnityEditor.Timeline
+{
+    static class StyleManager
+    {
+        static readonly StyleState[] k_StyleStates = { StyleState.any };
+        static readonly string k_ErrorCannotFindStyle = L10n.Tr("Cannot find style {0} for {1}");
+
+        static Dictionary<Type, GUIStyle> s_CustomStyles = new Dictionary<Type, GUIStyle>();
+        static GUISkin s_CurrentSkin;
+
+        public static GUIStyle UssStyleForType(Type type)
+        {
+            ClearCacheIfInvalid();
+
+            GUIStyle cachedStyle;
+            if (s_CustomStyles.TryGetValue(type, out cachedStyle))
+                return cachedStyle;
+
+            var style = DirectorStyles.GetGUIStyle(DirectorStyles.markerDefaultStyle);
+
+            var customStyleForType = CustomStyleForType(type);
+            if (customStyleForType != null)
+            {
+                if (IsStyleValid(customStyleForType))
+                    style = DirectorStyles.GetGUIStyle(customStyleForType);
+                else
+                    Debug.LogWarningFormat(k_ErrorCannotFindStyle, customStyleForType, type.Name);
+            }
+
+            s_CustomStyles.Add(type, style);
+            return style;
+        }
+
+        static string CustomStyleForType(Type type)
+        {
+            var attr = (CustomStyleAttribute)type.GetCustomAttributes(typeof(CustomStyleAttribute), true).FirstOrDefault();
+            return attr != null ? attr.ussStyle : null;
+        }
+
+        static bool IsStyleValid(string ussStyle)
+        {
+            return GUISkin.current.FindStyle(ussStyle) != null || EditorResources.styleCatalog.GetStyle(ussStyle, k_StyleStates).IsValid();
+        }
+
+        static void ClearCacheIfInvalid()
+        {
+            if (s_CurrentSkin != GUISkin.current)
+                s_CustomStyles.Clear();
+            s_CurrentSkin = GUISkin.current;
+        }
+    }
+}