services/inputflinger/reader/mapper/accumulator/CursorScrollAccumulator.cpp

/*
 * Copyright (C) 2019 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "CursorScrollAccumulator.h"

#include "EventHub.h"
#include "InputDevice.h"

namespace android {

CursorScrollAccumulator::CursorScrollAccumulator() : mHaveRelWheel(false), mHaveRelHWheel(false) {
    clearRelativeAxes();
}

void CursorScrollAccumulator::configure(InputDeviceContext& deviceContext) {
    mHaveRelWheel = deviceContext.hasRelativeAxis(REL_WHEEL);
    mHaveRelHWheel = deviceContext.hasRelativeAxis(REL_HWHEEL);
}

void CursorScrollAccumulator::reset(InputDeviceContext& deviceContext) {
    clearRelativeAxes();
}

void CursorScrollAccumulator::clearRelativeAxes() {
    mRelWheel = 0;
    mRelHWheel = 0;
}

void CursorScrollAccumulator::process(const RawEvent* rawEvent) {
    if (rawEvent->type == EV_REL) {
        switch (rawEvent->code) {
            case REL_WHEEL:
                mRelWheel = rawEvent->value;
                break;
            case REL_HWHEEL:
                mRelHWheel = rawEvent->value;
                break;
        }
    }
}

void CursorScrollAccumulator::finishSync() {
    clearRelativeAxes();
}

} // namespace android