| // 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/command_line.h" |
| #include "base/lazy_instance.h" |
| #include "base/logging.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 defined(OS_CHROMEOS) |
| const int kSystemKeyModifierMask = EF_ALT_DOWN | EF_COMMAND_DOWN; |
| #elif defined(OS_MACOSX) |
| // Alt modifier is used to input extended characters on Mac. |
| const int kSystemKeyModifierMask = EF_COMMAND_DOWN; |
| #else |
| const int kSystemKeyModifierMask = EF_ALT_DOWN; |
| #endif // !defined(OS_CHROMEOS) && !defined(OS_MACOSX) |
| |
| } // 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::TimeDelta::FromSecondsD(time_stamp_seconds); |
| } |
| |
| } // namespace ui |