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/*
* Copyright (C) 2022 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 "PreferStylusOverTouchBlocker.h"
#include <input/PrintTools.h>
namespace android {
static std::pair<bool, bool> checkToolType(const NotifyMotionArgs& args) {
bool hasStylus = false;
bool hasTouch = false;
for (size_t i = 0; i < args.pointerCount; i++) {
// Make sure we are canceling stylus pointers
const int32_t toolType = args.pointerProperties[i].toolType;
if (toolType == AMOTION_EVENT_TOOL_TYPE_STYLUS ||
toolType == AMOTION_EVENT_TOOL_TYPE_ERASER) {
hasStylus = true;
}
if (toolType == AMOTION_EVENT_TOOL_TYPE_FINGER) {
hasTouch = true;
}
}
return std::make_pair(hasTouch, hasStylus);
}
/**
* Intersect two sets in-place, storing the result in 'set1'.
* Find elements in set1 that are not present in set2 and delete them,
* relying on the fact that the two sets are ordered.
*/
template <typename T>
static void intersectInPlace(std::set<T>& set1, const std::set<T>& set2) {
typename std::set<T>::iterator it1 = set1.begin();
typename std::set<T>::const_iterator it2 = set2.begin();
while (it1 != set1.end() && it2 != set2.end()) {
const T& element1 = *it1;
const T& element2 = *it2;
if (element1 < element2) {
// This element is not present in set2. Remove it from set1.
it1 = set1.erase(it1);
continue;
}
if (element2 < element1) {
it2++;
}
if (element1 == element2) {
it1++;
it2++;
}
}
// Remove the rest of the elements in set1 because set2 is already exhausted.
set1.erase(it1, set1.end());
}
/**
* Same as above, but prune a map
*/
template <typename K, class V>
static void intersectInPlace(std::map<K, V>& map, const std::set<K>& set2) {
typename std::map<K, V>::iterator it1 = map.begin();
typename std::set<K>::const_iterator it2 = set2.begin();
while (it1 != map.end() && it2 != set2.end()) {
const auto& [key, _] = *it1;
const K& element2 = *it2;
if (key < element2) {
// This element is not present in set2. Remove it from map.
it1 = map.erase(it1);
continue;
}
if (element2 < key) {
it2++;
}
if (key == element2) {
it1++;
it2++;
}
}
// Remove the rest of the elements in map because set2 is already exhausted.
map.erase(it1, map.end());
}
// -------------------------------- PreferStylusOverTouchBlocker -----------------------------------
std::vector<NotifyMotionArgs> PreferStylusOverTouchBlocker::processMotion(
const NotifyMotionArgs& args) {
const auto [hasTouch, hasStylus] = checkToolType(args);
const bool isUpOrCancel =
args.action == AMOTION_EVENT_ACTION_UP || args.action == AMOTION_EVENT_ACTION_CANCEL;
if (hasTouch && hasStylus) {
mDevicesWithMixedToolType.insert(args.deviceId);
}
// Handle the case where mixed touch and stylus pointers are reported. Add this device to the
// ignore list, since it clearly supports simultaneous touch and stylus.
if (mDevicesWithMixedToolType.find(args.deviceId) != mDevicesWithMixedToolType.end()) {
// This event comes from device with mixed stylus and touch event. Ignore this device.
if (mCanceledDevices.find(args.deviceId) != mCanceledDevices.end()) {
// If we started to cancel events from this device, continue to do so to keep
// the stream consistent. It should happen at most once per "mixed" device.
if (isUpOrCancel) {
mCanceledDevices.erase(args.deviceId);
mLastTouchEvents.erase(args.deviceId);
}
return {};
}
return {args};
}
const bool isStylusEvent = hasStylus;
const bool isDown = args.action == AMOTION_EVENT_ACTION_DOWN;
if (isStylusEvent) {
if (isDown) {
// Reject all touch while stylus is down
mActiveStyli.insert(args.deviceId);
// Cancel all current touch!
std::vector<NotifyMotionArgs> result;
for (auto& [deviceId, lastTouchEvent] : mLastTouchEvents) {
if (mCanceledDevices.find(deviceId) != mCanceledDevices.end()) {
// Already canceled, go to next one.
continue;
}
// Not yet canceled. Cancel it.
lastTouchEvent.action = AMOTION_EVENT_ACTION_CANCEL;
lastTouchEvent.flags |= AMOTION_EVENT_FLAG_CANCELED;
lastTouchEvent.eventTime = systemTime(SYSTEM_TIME_MONOTONIC);
result.push_back(lastTouchEvent);
mCanceledDevices.insert(deviceId);
}
result.push_back(args);
return result;
}
if (isUpOrCancel) {
mActiveStyli.erase(args.deviceId);
}
// Never drop stylus events
return {args};
}
const bool isTouchEvent = hasTouch;
if (isTouchEvent) {
// Suppress the current gesture if any stylus is still down
if (!mActiveStyli.empty()) {
mCanceledDevices.insert(args.deviceId);
}
const bool shouldDrop = mCanceledDevices.find(args.deviceId) != mCanceledDevices.end();
if (isUpOrCancel) {
mCanceledDevices.erase(args.deviceId);
mLastTouchEvents.erase(args.deviceId);
}
// If we already canceled the current gesture, then continue to drop events from it, even if
// the stylus has been lifted.
if (shouldDrop) {
return {};
}
if (!isUpOrCancel) {
mLastTouchEvents[args.deviceId] = args;
}
return {args};
}
// Not a touch or stylus event
return {args};
}
void PreferStylusOverTouchBlocker::notifyInputDevicesChanged(
const std::vector<InputDeviceInfo>& inputDevices) {
std::set<int32_t> presentDevices;
for (const InputDeviceInfo& device : inputDevices) {
presentDevices.insert(device.getId());
}
// Only keep the devices that are still present.
intersectInPlace(mDevicesWithMixedToolType, presentDevices);
intersectInPlace(mLastTouchEvents, presentDevices);
intersectInPlace(mCanceledDevices, presentDevices);
intersectInPlace(mActiveStyli, presentDevices);
}
void PreferStylusOverTouchBlocker::notifyDeviceReset(const NotifyDeviceResetArgs& args) {
mDevicesWithMixedToolType.erase(args.deviceId);
mLastTouchEvents.erase(args.deviceId);
mCanceledDevices.erase(args.deviceId);
mActiveStyli.erase(args.deviceId);
}
static std::string dumpArgs(const NotifyMotionArgs& args) {
return args.dump();
}
std::string PreferStylusOverTouchBlocker::dump() const {
std::string out;
out += "mActiveStyli: " + dumpSet(mActiveStyli) + "\n";
out += "mLastTouchEvents: " + dumpMap(mLastTouchEvents, constToString, dumpArgs) + "\n";
out += "mDevicesWithMixedToolType: " + dumpSet(mDevicesWithMixedToolType) + "\n";
out += "mCanceledDevices: " + dumpSet(mCanceledDevices) + "\n";
return out;
}
} // namespace android
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