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diff --git a/xmake/core/ui/action.lua b/xmake/core/ui/action.lua
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+++ b/xmake/core/ui/action.lua
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+--!A cross-platform build utility based on Lua
+--
+-- Licensed to the Apache Software Foundation (ASF) under one
+-- or more contributor license agreements.  See the NOTICE file
+-- distributed with this work for additional information
+-- regarding copyright ownership.  The ASF licenses this file
+-- to you under the Apache License, Version 2.0 (the
+-- "License"); you may not use this file except in compliance
+-- with the License.  You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+-- 
+-- Copyright (C) 2015 - 2018, TBOOX Open Source Group.
+--
+-- @author      ruki
+-- @file        action.lua
+--
+
+-- load modules
+local log    = require("ui/log")
+local object = require("ui/object")
+
+-- define module
+local action = action or object { }
+
+-- register action types
+function action:register(tag, ...)
+    local base = self[tag] or 0
+    local enums = {...}
+    local n = #enums
+    for i = 1, n do
+        self[enums[i]] = i + base
+    end
+    self[tag] = base + n
+end
+
+-- register action enums
+action:register("ac_max", 
+                "ac_on_text_changed",
+                "ac_on_enter",
+                "ac_on_exit")
+
+-- return module
+return action