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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_EVENTS_OZONE_EVDEV_TOUCH_FILTER_PALM_DETECTION_FILTER_H_
#define UI_EVENTS_OZONE_EVDEV_TOUCH_FILTER_PALM_DETECTION_FILTER_H_
#if defined(__ANDROID__) || defined(__ANDROID_HOST__)
#include "chrome_to_android_compatibility.h"
#endif
#include <bitset>
#include <vector>
#include "base/time/time.h"
#include "ui/events/ozone/evdev/touch_evdev_types.h"
#include "ui/events/ozone/evdev/touch_filter/shared_palm_detection_filter_state.h"
namespace ui {
// An abstract palm detection filter. It has two functions:
// 1. To decide which touches to "hold"
// 2. To decide which touches to suppress / "cancel".
// Interface is similar to that of TouchFilter but enshrines the "hold" as a
// first class citizen.
class COMPONENT_EXPORT(EVDEV) PalmDetectionFilter {
public:
// shared_palm_state is not owned!
explicit PalmDetectionFilter(
SharedPalmDetectionFilterState* shared_palm_state);
virtual ~PalmDetectionFilter();
// Execute a filter event. Expected to be executed on every update to touches.
// Arguments are:
// 1. touches: a vector of kNumTouchEvdevSlots touches.
// 2. time: the latest event time in touches.
// 3. slots_to_hold: output bitset of slots to hold. Must not be null.
// 4. slots_to_suppress: output bitset of slots to suppress/cancel. Must not
// be null.
//
// Note that if a slot is marked as both suppress and hold, we expect the
// suppress to override the hold.
virtual void Filter(const std::vector<InProgressTouchEvdev>& touches,
base::TimeTicks time,
std::bitset<kNumTouchEvdevSlots>* slots_to_hold,
std::bitset<kNumTouchEvdevSlots>* slots_to_suppress) = 0;
// The name of this filter, for testing purposes.
virtual std::string FilterNameForTesting() const = 0;
protected:
// Not owned!
SharedPalmDetectionFilterState* const shared_palm_state_;
};
} // namespace ui
#endif // UI_EVENTS_OZONE_EVDEV_TOUCH_FILTER_PALM_DETECTION_FILTER_H_
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