4 files changed, 14 insertions, 5 deletions
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Font/FontData.cs b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Font/FontData.cs
index 760c9ee..3a85af1 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Font/FontData.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Font/FontData.cs
@@ -82,7 +82,7 @@ namespace UnityEngine.UI
         public int fontSize
         {
             get { return m_FontSize; }
-            set { m_FontSize = value; }
+            set { Debug.Log("FontData.fontSize"); m_FontSize = value; }
         }
 
         public FontStyle fontStyle
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Font/FontUpdateTracker.cs b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Font/FontUpdateTracker.cs
index 2228457..a63d62b 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Font/FontUpdateTracker.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Font/FontUpdateTracker.cs
@@ -4,6 +4,8 @@ using UnityEngine;
 
 namespace UnityEngine.UI
 {
+    // 全局记录使用了某个Font字体的所有Text，当这个Font的GlyphAtlas大小改变的时候通知这些Text重建mesh(更新UV）
+    // 因为GlyphAtlas大小改变了，原先的UV已经不对了
     public static class FontUpdateTracker
     {
         static Dictionary<Font, HashSet<Text>> m_Tracked = new Dictionary<Font, HashSet<Text>>();
@@ -16,10 +18,12 @@ namespace UnityEngine.UI
             HashSet<Text> exists;
             m_Tracked.TryGetValue(t.font, out exists);
             if (exists == null)
-            {
-                // The textureRebuilt event is global for all fonts, so we add our delegate the first time we register *any* Text
+            {
+                // font texture重新生成的时候会调这个回调，然后需要Text组件重建mesh的UV数据，因为原先的fontGlyph里的UV已经不准了
+                // https://docs.unity3d.com/ScriptReference/Font-textureRebuilt.html
+                // The textureRebuilt event is global for all fonts, so we add our delegate the first time we register *any* Text
                 if (m_Tracked.Count == 0)
-                    Font.textureRebuilt += RebuildForFont;
+                    Font.textureRebuilt += RebuildForFont; 
 
                 exists = new HashSet<Text>();
                 m_Tracked.Add(t.font, exists);
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/Text.cs b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Font/Text.cs
index c087983..3d3d17b 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/Text.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Font/Text.cs
@@ -32,6 +32,7 @@ namespace UnityEngine.UI
             useLegacyMeshGeneration = false;
         }
 
+        // text generator，得到字符串在glyph atlas中的UV，构建mesh
         /// <summary>
         /// Get or set the material used by this Text.
         /// </summary>
@@ -260,6 +261,7 @@ namespace UnityEngine.UI
             }
             set
             {
+                // font size改变的时候重建mesh
                 if (m_FontData.fontSize == value)
                     return;
                 m_FontData.fontSize = value;
@@ -391,6 +393,7 @@ namespace UnityEngine.UI
             font = Resources.GetBuiltinResource<Font>("Arial.ttf");
         }
 
+        // 根据FontData设置TextGenerationSettings 
         public TextGenerationSettings GetGenerationSettings(Vector2 extents)
         {
             var settings = new TextGenerationSettings();
@@ -407,7 +410,7 @@ namespace UnityEngine.UI
             settings.textAnchor = m_FontData.alignment;
             settings.alignByGeometry = m_FontData.alignByGeometry;
             settings.scaleFactor = pixelsPerUnit;
-            settings.color = color;
+            settings.color = color; // 这里是顶点颜色
             settings.font = font;
             settings.pivot = rectTransform.pivot;
             settings.richText = m_FontData.richText;
@@ -451,6 +454,7 @@ namespace UnityEngine.UI
 
             Vector2 extents = rectTransform.rect.size;
 
+            // 生成对应的网格数据（顶点、UV）
             var settings = GetGenerationSettings(extents);
             cachedTextGenerator.PopulateWithErrors(text, settings, gameObject);
 
@@ -543,6 +547,7 @@ namespace UnityEngine.UI
             base.OnRebuildRequested();
         }
 
+        // 当编辑器里修改了参数值的时候调这个回调，setDirty，后续重建mesh
         // The Text inspector editor can change the font, and we need a way to track changes so that we get the appropriate rebuild callbacks
         // We can intercept changes in OnValidate, and keep track of the previous font reference
         protected override void OnValidate()
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/Text.cs.meta b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Font/Text.cs.meta
index ea6d1d8..ea6d1d8 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Graphics/Text.cs.meta
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Font/Text.cs.meta