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- // Copyright 2015 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.
- #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 "build/chromeos_buildflags.h"
- #include "ui/events/event_constants.h"
- #include "ui/events/event_switches.h"
- namespace ui {
- namespace {
- #if BUILDFLAG(IS_CHROMEOS_ASH)
- 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(861855): 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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