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
|
// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/accessibility/chromevox/spoken_feedback_enabler.h"
#include "ash/accessibility/accessibility_controller.h"
#include "ash/shell.h"
#include "base/numerics/safe_conversions.h"
#include "ui/events/base_event_utils.h"
namespace ash {
namespace {
// Delay between timer callbacks. Each one plays a tick sound.
constexpr base::TimeDelta kTimerDelay = base::Milliseconds(500);
// The number of ticks of the timer before the first sound is generated.
constexpr int kTimerTicksOfFirstSoundFeedback = 6;
// The number of ticks of the timer before toggling spoken feedback.
constexpr int kTimerTicksToToggleSpokenFeedback = 10;
} // namespace
SpokenFeedbackEnabler::SpokenFeedbackEnabler() {
start_time_ = ui::EventTimeForNow();
timer_.Start(FROM_HERE, kTimerDelay, this, &SpokenFeedbackEnabler::OnTimer);
}
SpokenFeedbackEnabler::~SpokenFeedbackEnabler() {}
void SpokenFeedbackEnabler::OnTimer() {
base::TimeTicks now = ui::EventTimeForNow();
int tick_count = base::ClampRound((now - start_time_) / kTimerDelay);
AccessibilityController* controller =
Shell::Get()->accessibility_controller();
CHECK(controller);
if (tick_count >= kTimerTicksOfFirstSoundFeedback &&
tick_count < kTimerTicksToToggleSpokenFeedback) {
controller->PlaySpokenFeedbackToggleCountdown(tick_count);
} else if (tick_count == kTimerTicksToToggleSpokenFeedback) {
controller->SetSpokenFeedbackEnabled(
!controller->spoken_feedback().enabled(), A11Y_NOTIFICATION_SHOW);
timer_.Stop();
}
}
} // namespace ash
|
