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- // Copyright 2018 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 "ash/accessibility/chromevox/spoken_feedback_enabler.h"
- #include "ash/accessibility/accessibility_controller_impl.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);
- AccessibilityControllerImpl* 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
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