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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_EXO_WAYLAND_SERIAL_TRACKER_H_
#define COMPONENTS_EXO_WAYLAND_SERIAL_TRACKER_H_
#include <stdint.h>
#include <vector>
#include "base/memory/raw_ptr.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
struct wl_display;
namespace exo {
namespace wayland {
class SerialTracker {
public:
enum EventType {
POINTER_ENTER,
POINTER_LEAVE,
POINTER_BUTTON_DOWN,
POINTER_BUTTON_UP,
TOUCH_DOWN,
TOUCH_UP,
OTHER_EVENT,
};
static std::string ToString(EventType type);
explicit SerialTracker(struct wl_display* display);
SerialTracker(const SerialTracker&) = delete;
SerialTracker& operator=(const SerialTracker&) = delete;
~SerialTracker();
// After shutdown, |GetNextSerial| returns 0.
void Shutdown();
uint32_t GetNextSerial(EventType type);
// Get the serial number of the last {pointer,touch} pressed event, or nullopt
// if the press has since been released.
absl::optional<uint32_t> GetPointerDownSerial();
absl::optional<uint32_t> GetTouchDownSerial();
// Needed because wl_touch::cancel doesn't send a serial number, so we can't
// test for it in GetNextSerial.
void ResetTouchDownSerial();
// If there exists a serial for key already, returns it. Or, it creates
// a new serial, and returns it.
uint32_t MaybeNextKeySerial();
// Resets the stored key serial, so that next MaybeNextKeySerial() call will
// generate a new serial.
void ResetKeySerial();
// Get the EventType for a serial number, or nullopt if the serial number was
// never sent or is too old.
absl::optional<EventType> GetEventType(uint32_t serial) const;
std::string ToString() const;
private:
raw_ptr<struct wl_display, DanglingUntriaged | ExperimentalAsh> display_;
// EventTypes are stored in a circular buffer, because serial numbers are
// issued sequentially and we only want to store the most recent events.
std::vector<EventType> events_;
// [min_event_, max_event) is a half-open interval containing the range of
// valid serial numbers. Note that as serial numbers are allowed to wrap
// around the 32 bit space, we cannot assume that max_event_ >= min_event_.
uint32_t min_event_ = 1;
uint32_t max_event_ = 1;
absl::optional<uint32_t> pointer_down_serial_;
absl::optional<uint32_t> touch_down_serial_;
absl::optional<uint32_t> key_serial_;
};
} // namespace wayland
} // namespace exo
#endif // COMPONENTS_EXO_WAYLAND_SERIAL_TRACKER_H_
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