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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef _LIBINPUT_VIRTUAL_KEY_MAP_H
     18 #define _LIBINPUT_VIRTUAL_KEY_MAP_H
     19 
     20 #include <stdint.h>
     21 
     22 #include <input/Input.h>
     23 #include <utils/Errors.h>
     24 #include <utils/KeyedVector.h>
     25 #include <utils/Tokenizer.h>
     26 #include <utils/String8.h>
     27 #include <utils/Unicode.h>
     28 
     29 namespace android {
     30 
     31 /* Describes a virtual key. */
     32 struct VirtualKeyDefinition {
     33     int32_t scanCode;
     34 
     35     // configured position data, specified in display coords
     36     int32_t centerX;
     37     int32_t centerY;
     38     int32_t width;
     39     int32_t height;
     40 };
     41 
     42 
     43 /**
     44  * Describes a collection of virtual keys on a touch screen in terms of
     45  * virtual scan codes and hit rectangles.
     46  *
     47  * This object is immutable after it has been loaded.
     48  */
     49 class VirtualKeyMap {
     50 public:
     51     ~VirtualKeyMap();
     52 
     53     static status_t load(const String8& filename, VirtualKeyMap** outMap);
     54 
     55     inline const Vector<VirtualKeyDefinition>& getVirtualKeys() const {
     56         return mVirtualKeys;
     57     }
     58 
     59 private:
     60     class Parser {
     61         VirtualKeyMap* mMap;
     62         Tokenizer* mTokenizer;
     63 
     64     public:
     65         Parser(VirtualKeyMap* map, Tokenizer* tokenizer);
     66         ~Parser();
     67         status_t parse();
     68 
     69     private:
     70         bool consumeFieldDelimiterAndSkipWhitespace();
     71         bool parseNextIntField(int32_t* outValue);
     72     };
     73 
     74     Vector<VirtualKeyDefinition> mVirtualKeys;
     75 
     76     VirtualKeyMap();
     77 };
     78 
     79 } // namespace android
     80 
     81 #endif // _LIBINPUT_KEY_CHARACTER_MAP_H
     82