一篇文章搞懂unity编辑器中Event的rawType, type和GetTypeForControl

简介

Event.rawType就是初始的type，可以通过Event.Use()将rawType修改为EventType.Used。
Event.type是经过GUIClip过滤的rawType，如果事件触发时，鼠标位置位于当前GUIClip中，返回rawType，如果鼠标不在当前GUIClip中，则设置为EventType.Ignore
Event.GetTypeForControl 相对于Event.type在GUIClip过滤的基础上，增加了hotControl的判断，如果是hotControl，也直接返回rawType。

验证代码

鼠标点击浅色区域，此时鼠标位置位于GUIClip区域之外，GUICLip内的代码调用rawType会是MouseDown，type会是Ignore，由于设置了hotControl，GetTypeForControl会是MouseDown。
在我们重置hotControl为0时，GetTypeForControl的值也变成Ignore.

鼠标点击深色区域，此时鼠标位置位于GUIClip之内，此时 rawType， type 以及 GetTypeForControl 的结果都是MouseDown

public class EventDemoEditorWindow : EditorWindow
{[MenuItem("Demos/EventDemoEditorWindow")]static void ShowWindow(){var window = GetWindow<EventDemoEditorWindow>();window.titleContent = new GUIContent("EventDemoEditorWindow");window.Show();}private Event eventCache;private int buttonControlId;private void OnEnable(){}private void OnGUI(){//Event.GetTypeForControleventCache = Event.current;if (MGUILayout.Button($"按钮1")){Debug.Log("点击 按钮1");}var buttonRect = GUILayoutUtility.GetLastRect();buttonControlId = GetLastControlId();GUIUtility.hotControl = buttonControlId;//GUIUtility.hotControl = 0;//鼠标需要点击 ClipRect 的上方区域var clipRect = Rect.MinMaxRect(0, buttonRect.yMax+100, position.width, position.height);//if(eventCache.type == EventType.Repaint)GUI.Box(clipRect, string.Empty);//buttonControlId = GetLastControlId();//GUIUtility.hotControl = buttonControlId;GUI.BeginClip(clipRect, default(Vector2), default(Vector2), false);{if (eventCache.rawType == EventType.MouseDown){EventType type;type = eventCache.rawType;Debug.Log($"rawType = {type}");type = eventCache.GetTypeForControl(buttonControlId);Debug.Log($"GetTypeForControl={type}");type = eventCache.type;Debug.Log($"type={type}");GUIUtility.hotControl = 0;Debug.Log("----------------  Set HotControl=0   ----------------- ");type = eventCache.rawType;Debug.Log($"rawType = {type}");type = eventCache.GetTypeForControl(buttonControlId);Debug.Log($"GetTypeForControl={type}");type = eventCache.type;Debug.Log($"type={type}");eventCache.Use();Debug.Log("------------------  Event.Use()   ------------------- ");type = eventCache.rawType;Debug.Log($"rawType = {type}");type = eventCache.type;Debug.Log($"type={type}");}}GUI.EndClip();GUIUtility.hotControl = 0;}private int GetLastControlId(){var type = typeof(EditorGUIUtility);var field = type.GetField("s_LastControlID", BindingFlags.Static | BindingFlags.NonPublic);var lastControlID = (int)field.GetValue(null);return lastControlID;}}