*event system鍒濇帰

1 files changed, 44 insertions, 15 deletions

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;
         }