1 files changed, 6 insertions, 4 deletions

diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/LayoutRebuilder.cs b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/LayoutRebuilder.cs
index da201a7..6edd5b5 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/LayoutRebuilder.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Layout/LayoutRebuilder.cs
@@ -7,7 +7,7 @@ namespace UnityEngine.UI
     {
         // m_ToRebuild是一个ILayoutGroup
         private RectTransform m_ToRebuild; 
-        //There are a few of reasons we need to cache the Hash fromt he transform:
+        //There are a few of reasons we need to cache the Hash from the transform:
         //  - This is a ValueType (struct) and .Net calculates Hash from the Value Type fields.
         //  - The key of a Dictionary should have a constant Hash value.
         //  - It's possible for the Transform to get nulled from the Native side.
@@ -15,6 +15,7 @@ namespace UnityEngine.UI
         // So this struct gets used as a key to a dictionary, so we need to guarantee a constant Hash value.
         private int m_CachedHashFromTransform;
 
+        // 一个rebuilder结构的池子
         static ObjectPool<LayoutRebuilder> s_Rebuilders = new ObjectPool<LayoutRebuilder>(null, x => x.Clear());
 
         private void Initialize(RectTransform controller)
@@ -141,13 +142,14 @@ namespace UnityEngine.UI
             ListPool<Component>.Release(components);
         }
 
+        // 找到rect祖先节点中的layoutGroup并加入队列
         public static void MarkLayoutForRebuild(RectTransform rect)
         {
             if (rect == null)
                 return;
 
             var comps = ListPool<Component>.Get();
-            RectTransform layoutRoot = rect;
+            RectTransform layoutRoot = rect; // 祖先节点中的layoutGroup
             while (true)
             {
                 var parent = layoutRoot.parent as RectTransform;
@@ -183,7 +185,6 @@ namespace UnityEngine.UI
         {
             if (layoutRoot == null)
                 return false;
-
             layoutRoot.GetComponents(typeof(ILayoutController), comps);
             StripDisabledBehavioursFromList(comps);
             var valid =  comps.Count > 0;
@@ -197,13 +198,14 @@ namespace UnityEngine.UI
 
             var rebuilder = s_Rebuilders.Get();
             rebuilder.Initialize(controller);
-            // 注册进去
+            // 注册到CanvasUpdateRegistry里
             if (!CanvasUpdateRegistry.TryRegisterCanvasElementForLayoutRebuild(rebuilder))
                 s_Rebuilders.Release(rebuilder);
         }
 
         public void LayoutComplete()
         {
+            // 放回池子里
             s_Rebuilders.Release(this);
         }