1 /* 2 * Copyright (C) 2012 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 ANDROID_BUBBLE_LEVEL_ 18 #define ANDROID_BUBBLE_LEVEL_ 19 20 // Callback for level measurements. isLevel is true when the device lies flat. 21 #define BL_POLL_INTERVAL_MIN_SEC 1 22 #define BL_POLL_INTERVAL_DEFAULT_SEC 10 23 24 typedef void (*BubbleLevel_CallBack_t)(bool isLevel, void *userData); 25 26 #ifdef __cplusplus 27 28 class BubbleLevel 29 { 30 public: ~BubbleLevel()31 virtual ~BubbleLevel() {} 32 33 static BubbleLevel *create(); 34 35 // Set a callback called every time level measurement is complete 36 virtual int setCallback(BubbleLevel_CallBack_t callback, void *userData) = 0; 37 // Set the callback interval in seconds 38 virtual int setPollInterval(unsigned int seconds) = 0; 39 // Start polling for level: the callback will be called every poll interval 40 virtual int startPolling() = 0; 41 // Start polling for level: the callback will not be called any more and the accelerometer 42 // resource is released 43 virtual int stopPolling() = 0; 44 // The callback will be called once with current level measurement 45 virtual int pollOnce() = 0; 46 }; 47 48 extern "C" { 49 #endif /* __cplusplus */ 50 51 struct bubble_level *bubble_level_create(); 52 void bubble_level_release(const struct bubble_level *bubble_level); 53 54 struct bubble_level 55 { 56 // Set a callback called every time level measurement is complete 57 int (*set_callback)(const struct bubble_level *bubble_level, 58 BubbleLevel_CallBack_t callback, void *userData); 59 // Set the callback interval in seconds 60 int (*set_poll_interval)(const struct bubble_level *bubble_level, 61 unsigned int seconds); 62 // Start polling for level: the callback will be called every poll interval 63 int (*start_polling)(const struct bubble_level *bubble_level); 64 // Start polling for level: the callback will not be called any more and the accelerometer 65 // resource is released 66 int (*stop_polling)(const struct bubble_level *bubble_level); 67 // The callback will be called once with current level measurement 68 int (*poll_once)(const struct bubble_level *bubble_level); 69 }; 70 71 #ifdef __cplusplus 72 }; 73 #endif /* __cplusplus */ 74 75 #endif /*ANDROID_BUBBLE_LEVEL_*/ 76