Eric Laurent | bec6aef | 2012-10-16 10:06:15 -0700 | [diff] [blame] | 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: |
| 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_*/ |