services/inputflinger/InputListener.cpp

/*
 * Copyright (C) 2011 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.
 */

#define LOG_TAG "InputListener"

#define ATRACE_TAG ATRACE_TAG_INPUT

//#define LOG_NDEBUG 0

#include "InputListener.h"

#include <android-base/stringprintf.h>
#include <android/log.h>
#include <math.h>
#include <utils/Trace.h>

using android::base::StringPrintf;

namespace android {

std::list<NotifyArgs>& operator+=(std::list<NotifyArgs>& keep, std::list<NotifyArgs>&& consume) {
    keep.splice(keep.end(), consume);
    return keep;
}

// --- InputListenerInterface ---

// Helper to std::visit with lambdas.
template <typename... V>
struct Visitor : V... {};
// explicit deduction guide (not needed as of C++20)
template <typename... V>
Visitor(V...) -> Visitor<V...>;

void InputListenerInterface::notify(const NotifyArgs& generalArgs) {
    Visitor v{
            [&](const NotifyConfigurationChangedArgs& args) { notifyConfigurationChanged(&args); },
            [&](const NotifyKeyArgs& args) { notifyKey(&args); },
            [&](const NotifyMotionArgs& args) { notifyMotion(&args); },
            [&](const NotifySwitchArgs& args) { notifySwitch(&args); },
            [&](const NotifySensorArgs& args) { notifySensor(&args); },
            [&](const NotifyVibratorStateArgs& args) { notifyVibratorState(&args); },
            [&](const NotifyDeviceResetArgs& args) { notifyDeviceReset(&args); },
            [&](const NotifyPointerCaptureChangedArgs& args) {
                notifyPointerCaptureChanged(&args);
            },
    };
    std::visit(v, generalArgs);
}

// --- QueuedInputListener ---

static inline void traceEvent(const char* functionName, int32_t id) {
    if (ATRACE_ENABLED()) {
        std::string message = StringPrintf("%s(id=0x%" PRIx32 ")", functionName, id);
        ATRACE_NAME(message.c_str());
    }
}

QueuedInputListener::QueuedInputListener(InputListenerInterface& innerListener)
      : mInnerListener(innerListener) {}

void QueuedInputListener::notifyConfigurationChanged(
        const NotifyConfigurationChangedArgs* args) {
    traceEvent(__func__, args->id);
    mArgsQueue.emplace_back(*args);
}

void QueuedInputListener::notifyKey(const NotifyKeyArgs* args) {
    traceEvent(__func__, args->id);
    mArgsQueue.emplace_back(*args);
}

void QueuedInputListener::notifyMotion(const NotifyMotionArgs* args) {
    traceEvent(__func__, args->id);
    mArgsQueue.emplace_back(*args);
}

void QueuedInputListener::notifySwitch(const NotifySwitchArgs* args) {
    traceEvent(__func__, args->id);
    mArgsQueue.emplace_back(*args);
}

void QueuedInputListener::notifySensor(const NotifySensorArgs* args) {
    traceEvent(__func__, args->id);
    mArgsQueue.emplace_back(*args);
}

void QueuedInputListener::notifyVibratorState(const NotifyVibratorStateArgs* args) {
    traceEvent(__func__, args->id);
    mArgsQueue.emplace_back(*args);
}

void QueuedInputListener::notifyDeviceReset(const NotifyDeviceResetArgs* args) {
    traceEvent(__func__, args->id);
    mArgsQueue.emplace_back(*args);
}

void QueuedInputListener::notifyPointerCaptureChanged(const NotifyPointerCaptureChangedArgs* args) {
    traceEvent(__func__, args->id);
    mArgsQueue.emplace_back(*args);
}

void QueuedInputListener::flush() {
    for (const NotifyArgs& args : mArgsQueue) {
        mInnerListener.notify(args);
    }
    mArgsQueue.clear();
}

} // namespace android