1 /*
2  * Copyright (C) 2022 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 #pragma once
18 
19 #include "EventHub.h"
20 
21 #include <cstdint>
22 
23 namespace android {
24 
25 /* Keeps track of the state of currently reported HID usage code. */
26 class HidUsageAccumulator {
27 public:
28     explicit HidUsageAccumulator() = default;
reset()29     inline void reset() { *this = HidUsageAccumulator(); }
30 
31     void process(const RawEvent& rawEvent);
32 
33     /* This must be called when processing the `EV_KEY` event. Returns 0 if invalid. */
34     int32_t consumeCurrentHidUsage();
35 
36 private:
37     int32_t mCurrentHidUsage{};
38 };
39 
40 } // namespace android
41