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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_EVENTS_BASE_EVENT_UTILS_H_
#define UI_EVENTS_BASE_EVENT_UTILS_H_
#include <stdint.h>
#include "base/time/tick_clock.h"
#include "ui/events/events_base_export.h"
namespace base {
class TimeTicks;
}
// Common functions to be used for all platforms.
namespace ui {
// Generate an unique identifier for events.
EVENTS_BASE_EXPORT uint32_t GetNextTouchEventId();
// Checks if |flags| contains system key modifiers.
EVENTS_BASE_EXPORT bool IsSystemKeyModifier(int flags);
// Create a timestamp based on the current time.
EVENTS_BASE_EXPORT base::TimeTicks EventTimeForNow();
// Overrides the clock used by EventTimeForNow for testing.
// This doesn't take the ownership of the clock.
EVENTS_BASE_EXPORT void SetEventTickClockForTesting(
const base::TickClock* tick_clock);
// Converts an event timestamp ticks to seconds (floating point representation).
// WARNING: This should only be used when interfacing with platform code that
// does not use base::Time* types.
EVENTS_BASE_EXPORT double EventTimeStampToSeconds(base::TimeTicks time_stamp);
// Converts an event timestamp in seconds to TimeTicks.
// WARNING: This should only be used when interfacing with platform code that
// does not use base::Time* types.
EVENTS_BASE_EXPORT base::TimeTicks EventTimeStampFromSeconds(
double time_stamp_seconds);
// Returns false if an event timestamp is clearly bogus given that the event
// was generated a short time before |now|. Some fraction of devices, across
// all platforms provide bogus event timestamps. See
// https://crbug.com/650338#c1.
EVENTS_BASE_EXPORT bool IsValidTimebase(base::TimeTicks now,
base::TimeTicks timestamp);
// Ensures that the event timestamp values are coming from the same underlying
// monotonic clock as base::TimeTicks::Now() and if it is not then falls
// back to using the current ticks for event timestamp.
EVENTS_BASE_EXPORT void ValidateEventTimeClock(base::TimeTicks* timestamp);
} // namespace ui
#endif // UI_EVENTS_BASE_EVENT_UTILS_H_
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