*event system鍒濇帰

1 files changed, 7 insertions, 0 deletions

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;