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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "ui/events/base_event_utils.h" | 5 #include "ui/events/base_event_utils.h" |
6 | 6 |
7 #include "base/atomic_sequence_num.h" | 7 #include "base/atomic_sequence_num.h" |
8 #include "base/command_line.h" | |
8 #include "base/logging.h" | 9 #include "base/logging.h" |
9 #include "ui/events/event_constants.h" | 10 #include "ui/events/event_constants.h" |
11 #include "ui/events/event_switches.h" | |
10 | 12 |
11 namespace ui { | 13 namespace ui { |
12 | 14 |
13 namespace { | 15 namespace { |
14 | 16 |
15 #if defined(OS_CHROMEOS) | 17 #if defined(OS_CHROMEOS) |
16 const int kSystemKeyModifierMask = EF_ALT_DOWN | EF_COMMAND_DOWN; | 18 const int kSystemKeyModifierMask = EF_ALT_DOWN | EF_COMMAND_DOWN; |
19 | |
20 // Determines whether touch events are enabled or disabled on ChromeOS only. | |
21 bool touch_events_enabled = true; | |
22 | |
17 #else | 23 #else |
18 const int kSystemKeyModifierMask = EF_ALT_DOWN; | 24 const int kSystemKeyModifierMask = EF_ALT_DOWN; |
19 #endif // defined(OS_CHROMEOS) | 25 #endif // defined(OS_CHROMEOS) |
20 | 26 |
21 | |
22 } // namespace | 27 } // namespace |
23 | 28 |
24 base::StaticAtomicSequenceNumber g_next_event_id; | 29 base::StaticAtomicSequenceNumber g_next_event_id; |
25 | 30 |
26 uint32 GetNextTouchEventId() { | 31 uint32 GetNextTouchEventId() { |
27 // Set the first touch event ID to 1 because we set id to 0 for other types | 32 // Set the first touch event ID to 1 because we set id to 0 for other types |
28 // of events. | 33 // of events. |
29 uint32 id = g_next_event_id.GetNext(); | 34 uint32 id = g_next_event_id.GetNext(); |
30 if (id == 0) | 35 if (id == 0) |
31 id = g_next_event_id.GetNext(); | 36 id = g_next_event_id.GetNext(); |
32 DCHECK_NE(0U, id); | 37 DCHECK_NE(0U, id); |
33 return id; | 38 return id; |
34 } | 39 } |
35 | 40 |
36 bool IsSystemKeyModifier(int flags) { | 41 bool IsSystemKeyModifier(int flags) { |
37 // AltGr modifier is used to type alternative keys on certain keyboard layouts | 42 // AltGr modifier is used to type alternative keys on certain keyboard layouts |
38 // so we don't consider keys with the AltGr modifier as a system key. | 43 // so we don't consider keys with the AltGr modifier as a system key. |
39 return (kSystemKeyModifierMask & flags) != 0 && | 44 return (kSystemKeyModifierMask & flags) != 0 && |
40 (EF_ALTGR_DOWN & flags) == 0; | 45 (EF_ALTGR_DOWN & flags) == 0; |
41 } | 46 } |
42 | 47 |
48 #if defined(OS_CHROMEOS) | |
49 | |
50 void SetTouchEventsEnabled(bool enabled) { | |
51 touch_events_enabled = enabled; | |
52 } | |
53 | |
54 #endif // defined(OS_CHROMEOS) | |
55 | |
56 bool AreTouchEventsEnabled() { | |
57 #if defined(OS_CHROMEOS) | |
58 return touch_events_enabled; | |
59 #else | |
60 const base::CommandLine& command_line = | |
61 *base::CommandLine::ForCurrentProcess(); | |
62 const std::string touch_enabled_switch = | |
63 command_line.HasSwitch(switches::kTouchEvents) ? | |
64 command_line.GetSwitchValueASCII(switches::kTouchEvents) : | |
65 switches::kTouchEventsAuto; | |
66 | |
67 if (touch_enabled_switch.empty() || | |
68 touch_enabled_switch == switches::kTouchEventsEnabled || | |
69 touch_enabled_switch == switches::kTouchEventsAuto) { | |
70 return true; | |
71 } | |
72 | |
73 if (touch_enabled_switch != switches::kTouchEventsDisabled) | |
74 LOG(ERROR) << "Invalid --touch-events option: " << touch_enabled_switch; | |
75 return false; | |
sadrul
2015/11/03 19:09:26
We need to cache the return value, so we don't hav
afakhry
2015/11/04 02:28:21
Done.
| |
76 #endif // defined(OS_CHROMEOS) | |
77 } | |
78 | |
43 } // namespace ui | 79 } // namespace ui |
44 | 80 |
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