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      1 /*
      2  * Copyright (C) 2008 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 _UI_KEY_LAYOUT_MAP_H
     18 #define _UI_KEY_LAYOUT_MAP_H
     19 
     20 #include <stdint.h>
     21 #include <utils/Errors.h>
     22 #include <utils/KeyedVector.h>
     23 #include <utils/Tokenizer.h>
     24 
     25 namespace android {
     26 
     27 struct AxisInfo {
     28     enum Mode {
     29         // Axis value is reported directly.
     30         MODE_NORMAL = 0,
     31         // Axis value should be inverted before reporting.
     32         MODE_INVERT = 1,
     33         // Axis value should be split into two axes
     34         MODE_SPLIT = 2,
     35     };
     36 
     37     // Axis mode.
     38     Mode mode;
     39 
     40     // Axis id.
     41     // When split, this is the axis used for values smaller than the split position.
     42     int32_t axis;
     43 
     44     // When split, this is the axis used for values after higher than the split position.
     45     int32_t highAxis;
     46 
     47     // The split value, or 0 if not split.
     48     int32_t splitValue;
     49 
     50     // The flat value, or -1 if none.
     51     int32_t flatOverride;
     52 
     53     AxisInfo() : mode(MODE_NORMAL), axis(-1), highAxis(-1), splitValue(0), flatOverride(-1) {
     54     }
     55 };
     56 
     57 /**
     58  * Describes a mapping from keyboard scan codes and joystick axes to Android key codes and axes.
     59  */
     60 class KeyLayoutMap {
     61 public:
     62     ~KeyLayoutMap();
     63 
     64     static status_t load(const String8& filename, KeyLayoutMap** outMap);
     65 
     66     status_t mapKey(int32_t scanCode, int32_t* keyCode, uint32_t* flags) const;
     67     status_t findScanCodesForKey(int32_t keyCode, Vector<int32_t>* outScanCodes) const;
     68 
     69     status_t mapAxis(int32_t scanCode, AxisInfo* outAxisInfo) const;
     70 
     71 private:
     72     struct Key {
     73         int32_t keyCode;
     74         uint32_t flags;
     75     };
     76 
     77     KeyedVector<int32_t, Key> mKeys;
     78     KeyedVector<int32_t, AxisInfo> mAxes;
     79 
     80     KeyLayoutMap();
     81 
     82     class Parser {
     83         KeyLayoutMap* mMap;
     84         Tokenizer* mTokenizer;
     85 
     86     public:
     87         Parser(KeyLayoutMap* map, Tokenizer* tokenizer);
     88         ~Parser();
     89         status_t parse();
     90 
     91     private:
     92         status_t parseKey();
     93         status_t parseAxis();
     94     };
     95 };
     96 
     97 } // namespace android
     98 
     99 #endif // _UI_KEY_LAYOUT_MAP_H
    100