65 lines
2.5 KiB
C++
65 lines
2.5 KiB
C++
/*
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* Copyright (C) 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <optional>
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#include <set>
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#include "InputListener.h"
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namespace android {
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/**
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* When stylus is down, all touch is ignored.
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* TODO(b/210159205): delete this when simultaneous stylus and touch is supported
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*/
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class PreferStylusOverTouchBlocker {
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public:
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/**
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* Process the provided event and emit 0 or more events that should be used instead of it.
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* In the majority of cases, the returned result will just be the provided args (array with
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* only 1 element), unmodified.
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*
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* If the gesture should be blocked, the returned result may be:
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*
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* a) An empty array, if the current event should just be ignored completely
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* b) An array of N elements, containing N-1 events with ACTION_CANCEL and the current event.
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*
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* The returned result is intended to be reinjected into the original event stream in
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* replacement of the incoming event.
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*/
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std::vector<NotifyMotionArgs> processMotion(const NotifyMotionArgs& args);
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std::string dump() const;
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void notifyInputDevicesChanged(const std::vector<InputDeviceInfo>& inputDevices);
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void notifyDeviceReset(const NotifyDeviceResetArgs& args);
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private:
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// Stores the device id's of styli that are currently down.
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std::set<int32_t /*deviceId*/> mActiveStyli;
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// For each device, store the last touch event as long as the touch is down. Upon liftoff,
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// the entry is erased.
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std::map<int32_t /*deviceId*/, NotifyMotionArgs> mLastTouchEvents;
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// Device ids of devices for which the current touch gesture is canceled.
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std::set<int32_t /*deviceId*/> mCanceledDevices;
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// Device ids of input devices where we encountered simultaneous touch and stylus
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// events. For these devices, we don't do any event processing (nothing is blocked or altered).
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std::set<int32_t /*deviceId*/> mDevicesWithMixedToolType;
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};
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} // namespace android
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