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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.
#include "ui/events/base_event_utils.h"
#include "base/atomic_sequence_num.h"
#include "base/check_op.h"
#include "base/command_line.h"
#include "base/lazy_instance.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "ui/events/event_constants.h"
#include "ui/events/event_switches.h"
namespace ui {
namespace {
#if BUILDFLAG(IS_CHROMEOS)
const int kSystemKeyModifierMask = EF_ALT_DOWN | EF_COMMAND_DOWN;
#elif BUILDFLAG(IS_APPLE)
// Alt modifier is used to input extended characters on Mac.
const int kSystemKeyModifierMask = EF_COMMAND_DOWN;
#else
const int kSystemKeyModifierMask = EF_ALT_DOWN;
#endif
} // namespace
base::AtomicSequenceNumber g_next_event_id;
uint32_t GetNextTouchEventId() {
// Set the first touch event ID to 1 because we set id to 0 for other types
// of events.
uint32_t id = g_next_event_id.GetNext();
if (id == 0)
id = g_next_event_id.GetNext();
DCHECK_NE(0U, id);
return id;
}
bool IsSystemKeyModifier(int flags) {
// AltGr modifier is used to type alternative keys on certain keyboard layouts
// so we don't consider keys with the AltGr modifier as a system key.
return (kSystemKeyModifierMask & flags) != 0 &&
(EF_ALTGR_DOWN & flags) == 0;
}
base::LazyInstance<const base::TickClock*>::Leaky g_tick_clock =
LAZY_INSTANCE_INITIALIZER;
base::TimeTicks EventTimeForNow() {
return g_tick_clock.Get() ? g_tick_clock.Get()->NowTicks()
: base::TimeTicks::Now();
}
void SetEventTickClockForTesting(const base::TickClock* tick_clock) {
g_tick_clock.Get() = tick_clock;
}
double EventTimeStampToSeconds(base::TimeTicks time_stamp) {
return (time_stamp - base::TimeTicks()).InSecondsF();
}
base::TimeTicks EventTimeStampFromSeconds(double time_stamp_seconds) {
return base::TimeTicks() + base::Seconds(time_stamp_seconds);
}
bool IsValidTimebase(base::TimeTicks now, base::TimeTicks timestamp) {
int64_t delta = (now - timestamp).InMilliseconds();
return delta >= 0 && delta <= 60 * 1000;
}
void ValidateEventTimeClock(base::TimeTicks* timestamp) {
// Some fraction of devices, across all platforms provide bogus event
// timestamps. See https://crbug.com/650338#c1. Correct timestamps which are
// clearly bogus.
// TODO(crbug.com/41400553): Replace this with an approach that doesn't
// require an extra read of the current time per event.
base::TimeTicks now = EventTimeForNow();
if (!IsValidTimebase(now, *timestamp))
*timestamp = now;
}
} // namespace ui
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