blob: 4992f2ff627240df11f05657f6d53968f0871572 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
// 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/base/touch/touch_enabled.h"
#include "base/command_line.h"
#include "base/logging.h"
#include "ui/base/touch/touch_device.h"
#include "ui/base/ui_base_switches.h"
#include "ui/events/base_event_utils.h"
#include "ui/events/event_switches.h"
namespace ui {
namespace {
enum class TouchEventsStatus {
AUTO,
DISABLED,
ENABLED,
};
TouchEventsStatus ComputeTouchFlagStatus() {
auto* command_line = base::CommandLine::ForCurrentProcess();
const std::string touch_enabled_switch =
command_line->HasSwitch(switches::kTouchEvents) ?
command_line->GetSwitchValueASCII(switches::kTouchEvents) :
switches::kTouchEventsAuto;
if (touch_enabled_switch.empty() ||
touch_enabled_switch == switches::kTouchEventsEnabled) {
return TouchEventsStatus::ENABLED;
}
if (touch_enabled_switch == switches::kTouchEventsAuto)
return TouchEventsStatus::AUTO;
DLOG_IF(ERROR, touch_enabled_switch != switches::kTouchEventsDisabled) <<
"Invalid --touch-events option: " << touch_enabled_switch;
return TouchEventsStatus::DISABLED;
}
} // namespace
bool AreTouchEventsEnabled() {
static TouchEventsStatus touch_flag_status = ComputeTouchFlagStatus();
// The #touch-events flag is used to force and simulate the presence or
// absence of touch devices. Only if the flag is set to AUTO, we need to check
// for the actual availability of touch devices.
if (touch_flag_status == TouchEventsStatus::AUTO)
return GetTouchScreensAvailability() == TouchScreensAvailability::ENABLED;
return touch_flag_status == TouchEventsStatus::ENABLED;
}
} // namespace ui
|
