*event system鍒濇帰

25 files changed, 998 insertions, 230 deletions

diff --git a/Assets/Art.meta b/Assets/Art.meta
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diff --git a/Assets/Art/Sprite.meta b/Assets/Art/Sprite.meta
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diff --git a/Assets/Art/Sprite/pico8.png b/Assets/Art/Sprite/pico8.png
new file mode 100644
index 0000000..0d11f85
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new file mode 100644
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diff --git a/Assets/Scenes/demo.unity b/Assets/Scenes/2D_3D_Buttons.unity
index 140edec..7cbb577 100644
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diff --git a/Assets/Scenes/demo.unity.meta b/Assets/Scenes/2D_3D_Buttons.unity.meta
index 5d6fb8e..5d6fb8e 100644
--- a/Assets/Scenes/demo.unity.meta
+++ b/Assets/Scenes/2D_3D_Buttons.unity.meta
diff --git a/Assets/Scenes/EventTrigger.unity b/Assets/Scenes/EventTrigger.unity
new file mode 100644
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+++ b/Assets/Scenes/EventTrigger.unity
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diff --git a/Assets/Scenes/EventTrigger.unity.meta b/Assets/Scenes/EventTrigger.unity.meta
new file mode 100644
index 0000000..3781e50
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diff --git a/Assets/Scripts/CapsuleButton.cs b/Assets/Scripts/CapsuleButton.cs
new file mode 100644
index 0000000..9adee0f
--- /dev/null
+++ b/Assets/Scripts/CapsuleButton.cs
@@ -0,0 +1,24 @@
+锘縰sing System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.UI;
+using UnityEngine.EventSystems;
+
+public class CapsuleButton : MonoBehaviour, IPointerDownHandler, IPointerUpHandler, IPointerClickHandler
+{
+    public virtual void OnPointerClick(PointerEventData eventData)
+    {
+        Debug.Log("CapsuleButton.OnPointerClick");
+    }
+
+    public virtual void OnPointerUp(PointerEventData eventData)
+    {
+        Debug.Log("CapsuleButton.OnPointerUp");
+    }
+
+    public virtual void OnPointerDown(PointerEventData eventData)
+    {
+        Debug.Log("CapsuleButton.OnPointerDown");
+    }
+
+}
diff --git a/Assets/Scripts/CapsuleButton.cs.meta b/Assets/Scripts/CapsuleButton.cs.meta
new file mode 100644
index 0000000..7ec7b59
--- /dev/null
+++ b/Assets/Scripts/CapsuleButton.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 71800034947a58040a0004d4225a9007
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Scripts/PicoButton.cs b/Assets/Scripts/PicoButton.cs
new file mode 100644
index 0000000..385f90f
--- /dev/null
+++ b/Assets/Scripts/PicoButton.cs
@@ -0,0 +1,24 @@
+锘縰sing System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.UI;
+using UnityEngine.EventSystems;
+
+public class PicoButton : MonoBehaviour, IPointerDownHandler, IPointerUpHandler, IPointerClickHandler
+{
+    public virtual void OnPointerClick(PointerEventData eventData)
+    {
+        Debug.Log("PicoButton.OnPointerClick");
+    }
+
+    public virtual void OnPointerUp(PointerEventData eventData)
+    {
+        Debug.Log("PicoButton.OnPointerUp");
+    }
+
+    public virtual void OnPointerDown(PointerEventData eventData)
+    {
+        Debug.Log("PicoButton.OnPointerDown");
+    }
+
+}
diff --git a/Assets/Scripts/PicoButton.cs.meta b/Assets/Scripts/PicoButton.cs.meta
new file mode 100644
index 0000000..76c9e9b
--- /dev/null
+++ b/Assets/Scripts/PicoButton.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 8048cdebd1089744b99076ef93c3f3b2
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/EventData/BaseEventData.cs b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/EventData/BaseEventData.cs
index 62e6cb4..7b5a60d 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/EventData/BaseEventData.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/EventData/BaseEventData.cs
@@ -2,7 +2,7 @@ namespace UnityEngine.EventSystems
 {
     public abstract class AbstractEventData
     {
-        protected bool m_Used;
+        protected bool m_Used; // 当前事件是否被吞（被处理）
 
         public virtual void Reset()
         {
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/EventSystem.cs b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/EventSystem.cs
index 7ddabb8..3456e7b 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/EventSystem.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/EventSystem.cs
@@ -9,6 +9,7 @@ namespace UnityEngine.EventSystems
     [AddComponentMenu("Event/Event System")]
     public class EventSystem : UIBehaviour
     {
+		// 获得当前EventSystem挂着的BaseInputModule的派生类，一般来说只会挂一个StandableInputModule
         private List<BaseInputModule> m_SystemInputModules = new List<BaseInputModule>();
 
         private BaseInputModule m_CurrentInputModule;
@@ -20,7 +21,7 @@ namespace UnityEngine.EventSystems
         private GameObject m_FirstSelected;
 
         [SerializeField]
-        private bool m_sendNavigationEvents = true;
+        private bool m_sendNavigationEvents = true; // Should the EventSystem allow navigation events (move / submit / cancel).
 
         public bool sendNavigationEvents
         {
@@ -73,14 +74,15 @@ namespace UnityEngine.EventSystems
         protected EventSystem()
         {}
 
+        //c 把挂着的input modules加入m_SystemInputModules
         public void UpdateModules()
-        {
-            GetComponents(m_SystemInputModules);
-            for (int i = m_SystemInputModules.Count - 1; i >= 0; i--)
+		{
+			// 拿到当前EventSystem下面挂着的inputmodule,通常来说只会挂一个standaloneInputModule
+			GetComponents(m_SystemInputModules);
+			for (int i = m_SystemInputModules.Count - 1; i >= 0; i--)
             {
                 if (m_SystemInputModules[i] && m_SystemInputModules[i].IsActive())
                     continue;
-
                 m_SystemInputModules.RemoveAt(i);
             }
         }
@@ -177,6 +179,7 @@ namespace UnityEngine.EventSystems
 
         private static readonly Comparison<RaycastResult> s_RaycastComparer = RaycastComparer;
 
+        // 从PointerInputModule.GetTouchPointerEventData()来的触摸数据
         public void RaycastAll(PointerEventData eventData, List<RaycastResult> raycastResults)
         {
             raycastResults.Clear();
@@ -193,11 +196,13 @@ namespace UnityEngine.EventSystems
             raycastResults.Sort(s_RaycastComparer);
         }
 
+        //c 是否点击到某个物体
         public bool IsPointerOverGameObject()
         {
             return IsPointerOverGameObject(PointerInputModule.kMouseLeftId);
         }
 
+        //c 是否点击到某个物体
         public bool IsPointerOverGameObject(int pointerId)
         {
             if (m_CurrentInputModule == null)
@@ -233,8 +238,14 @@ namespace UnityEngine.EventSystems
             base.OnDisable();
         }
 
+        protected virtual void OnApplicationFocus(bool hasFocus)
+        {
+            m_HasFocus = hasFocus;
+        }
+
         private void TickModules()
         {
+		    // 只有standaloneInputModule一个
             for (var i = 0; i < m_SystemInputModules.Count; i++)
             {
                 if (m_SystemInputModules[i] != null)
@@ -242,17 +253,15 @@ namespace UnityEngine.EventSystems
             }
         }
 
-        protected virtual void OnApplicationFocus(bool hasFocus)
-        {
-            m_HasFocus = hasFocus;
-        }
-
+	    //c 事件处理跑在一个update里，以轮训的方式检测输入
         protected virtual void Update()
         {
             if (current != this)
                 return;
+
             TickModules();
 
+            // 将m_CurrentInputModule设置为m_SystemInputModules第一个可用的module
             bool changedModule = false;
             for (var i = 0; i < m_SystemInputModules.Count; i++)
             {
@@ -267,7 +276,6 @@ namespace UnityEngine.EventSystems
                     break;
                 }
             }
-
             // no event module set... set the first valid one...
             if (m_CurrentInputModule == null)
             {
@@ -283,6 +291,7 @@ namespace UnityEngine.EventSystems
                 }
             }
 
+            //c 执行事件处理主入口，通常情况下，如果没有自定义的inputModule，就是走StandaloneInputModule的Process
             if (!changedModule && m_CurrentInputModule != null)
                 m_CurrentInputModule.Process();
         }
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/EventTrigger.cs b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/EventTrigger.cs
index 6f4f179..11d1c1c 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/EventTrigger.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/EventTrigger.cs
@@ -5,6 +5,9 @@ using UnityEngine.Serialization;
 
 namespace UnityEngine.EventSystems
 {
+    //c 一个辅助组件，给一个事件添加自定义的回调函数
+    //继承了所有接口，效率不高，慎用。只是比较方便 
+
     [AddComponentMenu("Event/Event Trigger")]
     public class EventTrigger :
         MonoBehaviour,
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/ExecuteEvents.cs b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/ExecuteEvents.cs
index bf77717..71fd9f3 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/ExecuteEvents.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/ExecuteEvents.cs
@@ -233,8 +233,10 @@ namespace UnityEngine.EventSystems
             }
         }
 
+        //IEventSystemHandler是所有接口的基类
         private static readonly ObjectPool<List<IEventSystemHandler>> s_HandlerListPool = new ObjectPool<List<IEventSystemHandler>>(null, l => l.Clear());
 
+        // 向target gameobject发送一个事件，对每个实现了T接口的类执行functor方法（就是接口中定义的回调）
         public static bool Execute<T>(GameObject target, BaseEventData eventData, EventFunction<T> functor) where T : IEventSystemHandler
         {
             var internalHandlers = s_HandlerListPool.Get();
@@ -242,6 +244,8 @@ namespace UnityEngine.EventSystems
             //  if (s_InternalHandlers.Count > 0)
             //      Debug.Log("Executinng " + typeof (T) + " on " + target);
 
+            // 拿到实现了T接口的组件，调用对应的方法
+
             for (var i = 0; i < internalHandlers.Count; i++)
             {
                 T arg;
@@ -289,6 +293,7 @@ namespace UnityEngine.EventSystems
             return null;
         }
 
+        //c component是否匹配类型T且是否被激活
         private static bool ShouldSendToComponent<T>(Component component) where T : IEventSystemHandler
         {
             var valid = component is T;
@@ -315,8 +320,10 @@ namespace UnityEngine.EventSystems
 
             var components = ListPool<Component>.Get();
             go.GetComponents(components);
+            // 遍历所有的组件，找到匹配类型T的
             for (var i = 0; i < components.Count; i++)
             {
+                // 如果不匹配类型T，跳过这个
                 if (!ShouldSendToComponent<T>(components[i]))
                     continue;
 
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/BaseInput.cs b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/BaseInput.cs
index a761057..8d22d04 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/BaseInput.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/BaseInput.cs
@@ -1,5 +1,8 @@
 namespace UnityEngine.EventSystems
 {
+		
+	//c 对UnityEngine.Input进行一次简单包装，方便调试
+	// 另外如果希望自定义输入，继承这个类，并实现这些属性
     public class BaseInput : UIBehaviour
     {
         public virtual string compositionString
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/BaseInputModule.cs b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/BaseInputModule.cs
index 7125a4d..7661a8e 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/BaseInputModule.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/BaseInputModule.cs
@@ -14,9 +14,12 @@ namespace UnityEngine.EventSystems
         private EventSystem m_EventSystem;
         private BaseEventData m_BaseEventData;
 
-        protected BaseInput m_InputOverride;
-        private BaseInput m_DefaultInput;
-
+#region 输入系统
+				// 如果m_InputOverride不为空就用它，否则用默认的m_DefaultInput
+				// 如果要自己实现BaseInput，继承此类并给这个字段赋值
+				// StandaloneInputModule没有自定义，直接采用的是BaseInput
+				protected BaseInput m_InputOverride;
+        private   BaseInput m_DefaultInput;
         public BaseInput input
         {
             get
@@ -40,12 +43,12 @@ namespace UnityEngine.EventSystems
                     if (m_DefaultInput == null)
                         m_DefaultInput = gameObject.AddComponent<BaseInput>();
                 }
-
                 return m_DefaultInput;
             }
         }
+#endregion
 
-        protected EventSystem eventSystem
+		protected EventSystem eventSystem
         {
             get { return m_EventSystem; }
         }
@@ -54,13 +57,13 @@ namespace UnityEngine.EventSystems
         {
             base.OnEnable();
             m_EventSystem = GetComponent<EventSystem>();
-            m_EventSystem.UpdateModules();
+            m_EventSystem.UpdateModules(); // 把此input module加入EventSystem
         }
 
         protected override void OnDisable()
         {
-            m_EventSystem.UpdateModules();
-            base.OnDisable();
+            m_EventSystem.UpdateModules();// 把此input module移出EventSystem
+			base.OnDisable();
         }
 
         public abstract void Process();
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/PointerInputModule.cs b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/PointerInputModule.cs
index d31f433..9103162 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/PointerInputModule.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/PointerInputModule.cs
@@ -16,7 +16,7 @@ namespace UnityEngine.EventSystems
 
         protected bool GetPointerData(int id, out PointerEventData data, bool create)
         {
-            if (!m_PointerData.TryGetValue(id, out data) && create)
+            if (!m_PointerData.TryGetValue(id, out data) && create) // 一个池子
             {
                 data = new PointerEventData(eventSystem)
                 {
@@ -33,29 +33,33 @@ namespace UnityEngine.EventSystems
             m_PointerData.Remove(data.pointerId);
         }
 
+        //c 根据touch数据得到pointEventData，并且保存raycaster结果
         protected PointerEventData GetTouchPointerEventData(Touch input, out bool pressed, out bool released)
         {
             PointerEventData pointerData;
-            var created = GetPointerData(input.fingerId, out pointerData, true);
+            var created = GetPointerData(input.fingerId, out pointerData, true); // 拿到存储结构，返回是否是新建结构
 
             pointerData.Reset();
 
-            pressed = created || (input.phase == TouchPhase.Began);
-            released = (input.phase == TouchPhase.Canceled) || (input.phase == TouchPhase.Ended);
+            // pressed和released用来判断抬起或者放下
 
-            if (created)
+            pressed = created || (input.phase == TouchPhase.Began); // 如果结构是新建的或input phase是bagan，说明是刚按下
+            released = (input.phase == TouchPhase.Canceled) || (input.phase == TouchPhase.Ended); // 如果phase是这两种，说明是抬起来了
+
+            if (created)//如果是新建的，记录下起始位置，否则还保留旧值，下面用来计算delta
                 pointerData.position = input.position;
 
-            if (pressed)
+            if (pressed)//如果是刚按下，delta置为0
                 pointerData.delta = Vector2.zero;
             else
-                pointerData.delta = input.position - pointerData.position;
+                pointerData.delta = input.position - pointerData.position; // 计算delta
 
-            pointerData.position = input.position;
+            pointerData.position = input.position; // 计算完delta后覆盖
 
-            pointerData.button = PointerEventData.InputButton.Left;
+            pointerData.button = PointerEventData.InputButton.Left; // 这里不知道为什么
 
-            eventSystem.RaycastAll(pointerData, m_RaycastResultCache);
+            // 用这个触摸数据做射线检测，检测结果在m_RaycastResultCache
+            eventSystem.RaycastAll(pointerData, m_RaycastResultCache); 
 
             var raycast = FindFirstRaycast(m_RaycastResultCache);
             pointerData.pointerCurrentRaycast = raycast;
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/StandaloneInputModule.cs b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/StandaloneInputModule.cs
index ee6f216..f9a2f77 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/StandaloneInputModule.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/StandaloneInputModule.cs
@@ -1,3 +1,9 @@
+/*
+ * StandaloneInputModule : 
+ *     PointerInputModule : 
+ *         BaseInputModule
+ */
+
 using System;
 using UnityEngine;
 using UnityEngine.Serialization;
@@ -11,6 +17,7 @@ namespace UnityEngine.EventSystems
         private Vector2 m_LastMoveVector;
         private int m_ConsecutiveMoveCount = 0;
 
+				// 上一个鼠标位置和当前鼠标位置，每帧更新
         private Vector2 m_LastMousePosition;
         private Vector2 m_MousePosition;
 
@@ -136,11 +143,14 @@ namespace UnityEngine.EventSystems
             }
         }
 
+				//c 更新鼠标坐标
         public override void UpdateModule()
         {
+						// 如果没有获取焦点，且忽略没有焦点时的事件，返回（除非开启远程连接，否则会这样）
             if (!eventSystem.isFocused && ShouldIgnoreEventsOnNoFocus())
                 return;
 
+						// 更新鼠标位置
             m_LastMousePosition = m_MousePosition;
             m_MousePosition = input.mousePosition;
         }
@@ -190,41 +200,49 @@ namespace UnityEngine.EventSystems
             base.DeactivateModule();
             ClearSelection();
         }
-
+        
+        //c input module事件处理主入口
         public override void Process()
         {
-            if (!eventSystem.isFocused && ShouldIgnoreEventsOnNoFocus())
+            if (!eventSystem.isFocused && ShouldIgnoreEventsOnNoFocus()) // 如果没有获取焦点，不需要处理
                 return;
 
+            //event 给选中的对象发布更新事件
             bool usedEvent = SendUpdateEventToSelectedObject();
 
+            // 如果勾上了，发送move , submit, cancel事件
             if (eventSystem.sendNavigationEvents)
             {
                 if (!usedEvent)
-                    usedEvent |= SendMoveEventToSelectedObject();
+                    usedEvent |= SendMoveEventToSelectedObject(); //event 键盘方向键移动时给eventSystem选中的对象发布IMoveHandler事件
 
                 if (!usedEvent)
-                    SendSubmitEventToSelectedObject();
+                    SendSubmitEventToSelectedObject(); //event 如果按了相应按键，发布submit或者cancel事件
             }
 
+            // 模拟触摸或鼠标输入
             // touch needs to take precedence because of the mouse emulation layer
-            if (!ProcessTouchEvents() && input.mousePresent)
+            usedEvent = ProcessTouchEvents(); //event 发布触摸事件
+
+            if(!usedEvent && input.mousePresent)
                 ProcessMouseEvent();
         }
 
+        //c 触摸事件
         private bool ProcessTouchEvents()
         {
-            for (int i = 0; i < input.touchCount; ++i)
+            for (int i = 0; i < input.touchCount; ++i)  //多点触控
             {
                 Touch touch = input.GetTouch(i);
 
                 if (touch.type == TouchType.Indirect)
                     continue;
 
-                bool released;
-                bool pressed;
-                var pointer = GetTouchPointerEventData(touch, out pressed, out released);
+                bool released; // 这是一个手指抬起操作
+                bool pressed; // 这是一个手指放下操作
+                var pointer = GetTouchPointerEventData(touch, out pressed, out released); // 射线检测并保存检测结果
 
+                // 处理触摸或抬起反馈，已经准备好了被触摸的物体
                 ProcessTouchPress(pointer, pressed, released);
 
                 if (!released)
@@ -238,10 +256,12 @@ namespace UnityEngine.EventSystems
             return input.touchCount > 0;
         }
 
+        //c 处理触摸\抬起
         protected void ProcessTouchPress(PointerEventData pointerEvent, bool pressed, bool released)
         {
             var currentOverGo = pointerEvent.pointerCurrentRaycast.gameObject;
 
+            // 触摸反馈
             // PointerDown notification
             if (pressed)
             {
@@ -261,6 +281,7 @@ namespace UnityEngine.EventSystems
                     pointerEvent.pointerEnter = currentOverGo;
                 }
 
+                //event IPointerDownHandler 
                 // search for the control that will receive the press
                 // if we can't find a press handler set the press
                 // handler to be what would receive a click.
@@ -301,6 +322,7 @@ namespace UnityEngine.EventSystems
                     ExecuteEvents.Execute(pointerEvent.pointerDrag, pointerEvent, ExecuteEvents.initializePotentialDrag);
             }
 
+            // 抬起反馈
             // PointerUp notification
             if (released)
             {
@@ -310,14 +332,14 @@ namespace UnityEngine.EventSystems
                 // Debug.Log("KeyCode: " + pointer.eventData.keyCode);
 
                 // see if we mouse up on the same element that we clicked on...
-                var pointerUpHandler = ExecuteEvents.GetEventHandler<IPointerClickHandler>(currentOverGo);
+                var pointerUpHandler = ExecuteEvents.GetEventHandler<IPointerClickHandler>(currentOverGo); // 从这个对象开始往上找，直到一个挂了继承了IPointerClickHandler的组件
 
                 // PointerClick and Drop events
-                if (pointerEvent.pointerPress == pointerUpHandler && pointerEvent.eligibleForClick)
+                if (pointerEvent.pointerPress == pointerUpHandler && pointerEvent.eligibleForClick) //只有在pointerPress == pointerUpHandler时才会触发click事件
                 {
                     ExecuteEvents.Execute(pointerEvent.pointerPress, pointerEvent, ExecuteEvents.pointerClickHandler);
                 }
-                else if (pointerEvent.pointerDrag != null && pointerEvent.dragging)
+                else if (pointerEvent.pointerDrag != null && pointerEvent.dragging) // 如果两者不相等，触发drop事件
                 {
                     ExecuteEvents.ExecuteHierarchy(currentOverGo, pointerEvent, ExecuteEvents.dropHandler);
                 }
@@ -346,6 +368,8 @@ namespace UnityEngine.EventSystems
             if (eventSystem.currentSelectedGameObject == null)
                 return false;
 
+            // 发布submit事件或者cancel事件
+
             var data = GetBaseEventData();
             if (input.GetButtonDown(m_SubmitButton))
                 ExecuteEvents.Execute(eventSystem.currentSelectedGameObject, data, ExecuteEvents.submitHandler);
@@ -386,15 +410,16 @@ namespace UnityEngine.EventSystems
             float time = Time.unscaledTime;
 
             Vector2 movement = GetRawMoveVector();
-            if (Mathf.Approximately(movement.x, 0f) && Mathf.Approximately(movement.y, 0f))
+            if (Mathf.Approximately(movement.x, 0f) && Mathf.Approximately(movement.y, 0f)) // 如果键盘方向键没动，返回
             {
                 m_ConsecutiveMoveCount = 0;
                 return false;
             }
 
+            //allow即是否允许发布事件
             // If user pressed key again, always allow event
             bool allow = input.GetButtonDown(m_HorizontalAxis) || input.GetButtonDown(m_VerticalAxis);
-            bool similarDir = (Vector2.Dot(movement, m_LastMoveVector) > 0);
+            bool similarDir = (Vector2.Dot(movement, m_LastMoveVector) > 0); // 和之前的方向是否夹角在90°以内，如果是的话说明很接近
             if (!allow)
             {
                 // Otherwise, user held down key or axis.
@@ -408,15 +433,18 @@ namespace UnityEngine.EventSystems
             if (!allow)
                 return false;
 
+            // 发布IMoveHandler事件
+
             // Debug.Log(m_ProcessingEvent.rawType + " axis:" + m_AllowAxisEvents + " value:" + "(" + x + "," + y + ")");
             var axisEventData = GetAxisEventData(movement.x, movement.y, 0.6f);
 
             if (axisEventData.moveDir != MoveDirection.None)
             {
-                ExecuteEvents.Execute(eventSystem.currentSelectedGameObject, axisEventData, ExecuteEvents.moveHandler);
+                ExecuteEvents.Execute(eventSystem.currentSelectedGameObject, axisEventData, ExecuteEvents.moveHandler); // IMoveHandler.OnMove
                 if (!similarDir)
                     m_ConsecutiveMoveCount = 0;
                 m_ConsecutiveMoveCount++;
+
                 m_PrevActionTime = time;
                 m_LastMoveVector = movement;
             }
@@ -473,6 +501,7 @@ namespace UnityEngine.EventSystems
                 return false;
 
             var data = GetBaseEventData();
+            //event 向eventSystem当前选中的gameobject发布一个更新事件IUpdateSelectedHandler，比如inputfield
             ExecuteEvents.Execute(eventSystem.currentSelectedGameObject, data, ExecuteEvents.updateSelectedHandler);
             return data.used;
         }
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/TouchInputModule.cs b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/TouchInputModule.cs
index 4f04f42..58ac97c 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/TouchInputModule.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/InputModules/TouchInputModule.cs
@@ -4,13 +4,15 @@ using UnityEngine.Serialization;
 
 namespace UnityEngine.EventSystems
 {
-    [Obsolete("TouchInputModule is no longer required as Touch input is now handled in StandaloneInputModule.")]
+		//c TouchInputModule被废弃了，统一在standaloneInputModule中处理
+		[Obsolete("TouchInputModule is no longer required as Touch input is now handled in StandaloneInputModule.")]
     [AddComponentMenu("Event/Touch Input Module")]
     public class TouchInputModule : PointerInputModule
     {
         protected TouchInputModule()
         {}
 
+				// 触摸点位置
         private Vector2 m_LastMousePosition;
         private Vector2 m_MousePosition;
 
@@ -31,6 +33,7 @@ namespace UnityEngine.EventSystems
             set { m_ForceModuleActive = value; }
         }
 
+				//c 更新鼠标（触摸点）位置
         public override void UpdateModule()
         {
             m_LastMousePosition = m_MousePosition;
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/RaycastResult.cs b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/RaycastResult.cs
index 12a339b..666ef8d 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/RaycastResult.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/RaycastResult.cs
@@ -1,5 +1,6 @@
 namespace UnityEngine.EventSystems
 {
+    // UGUI射线检测结果
     public struct RaycastResult
     {
         private GameObject m_GameObject; // Game object hit by the raycast
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/Raycasters/Physics2DRaycaster.cs b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/Raycasters/Physics2DRaycaster.cs
index 783cf95..6346938 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/Raycasters/Physics2DRaycaster.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/Raycasters/Physics2DRaycaster.cs
@@ -13,6 +13,7 @@ namespace UnityEngine.EventSystems
         protected Physics2DRaycaster()
         {}
 
+        // 发射线
         public override void Raycast(PointerEventData eventData, List<RaycastResult> resultAppendList)
         {
             if (eventCamera == null)
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/Raycasters/PhysicsRaycaster.cs b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/Raycasters/PhysicsRaycaster.cs
index 2b4bea3..c7d431c 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/Raycasters/PhysicsRaycaster.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/Raycasters/PhysicsRaycaster.cs
@@ -3,6 +3,8 @@ using UnityEngine.UI;
 
 namespace UnityEngine.EventSystems
 {
+    //c 投射3D物体的相机挂这个脚本
+
     /// <summary>
     /// Simple event system using physics raycasts.
     /// </summary>
@@ -66,7 +68,7 @@ namespace UnityEngine.EventSystems
         {
             ray = eventCamera.ScreenPointToRay(eventData.position);
             // compensate far plane distance - see MouseEvents.cs
-            float projectionDirection = ray.direction.z;
+            float projectionDirection = ray.direction.z; // ray.direction是归一化了的
             distanceToClipPlane = Mathf.Approximately(0.0f, projectionDirection)
                 ? Mathf.Infinity
                 : Mathf.Abs((eventCamera.farClipPlane - eventCamera.nearClipPlane) / projectionDirection);
@@ -78,6 +80,7 @@ namespace UnityEngine.EventSystems
             if (eventCamera == null || !eventCamera.pixelRect.Contains(eventData.position))
                 return;
 
+            // 根据触摸数据拿到射线
             Ray ray;
             float distanceToClipPlane;
             ComputeRayAndDistance(eventData, out ray, out distanceToClipPlane);
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/InputField.cs b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/InputField.cs
index d203e97..1f3267a 100644
--- a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/InputField.cs
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/InputField.cs
@@ -1237,6 +1237,7 @@ namespace UnityEngine.UI
             KeyPressed(e);
         }
 
+        //c IUpdateSelectedHandler的接口
         public virtual void OnUpdateSelected(BaseEventData eventData)
         {
             if (!isFocused)