ash/accelerators/spoken_feedback_toggler.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ash/accelerators/spoken_feedback_toggler.h"
   6
   7 #include "ash/accelerators/key_hold_detector.h"
   8 #include "ash/accessibility_delegate.h"
   9 #include "ash/shell.h"
  10 #include "ui/events/event.h"
  11
  12 namespace ash {
  13 namespace {
  14 bool speech_feedback_toggler_enabled = false;
  15 }
  16
  17 // static
  18 bool SpokenFeedbackToggler::IsEnabled() {
  19   return speech_feedback_toggler_enabled;
  20 }
  21
  22 // static
  23 void SpokenFeedbackToggler::SetEnabled(bool enabled) {
  24   speech_feedback_toggler_enabled = enabled;
  25 }
  26
  27 // static
  28 scoped_ptr<ui::EventHandler> SpokenFeedbackToggler::CreateHandler() {
  29   scoped_ptr<KeyHoldDetector::Delegate> delegate(new SpokenFeedbackToggler());
  30   return scoped_ptr<ui::EventHandler>(new KeyHoldDetector(delegate.Pass()));
  31 }
  32
  33 bool SpokenFeedbackToggler::ShouldProcessEvent(
  34     const ui::KeyEvent* event) const {
  35   return IsEnabled() && event->key_code() == ui::VKEY_F6;
  36 }
  37
  38 bool SpokenFeedbackToggler::IsStartEvent(const ui::KeyEvent* event) const {
  39   return event->type() == ui::ET_KEY_PRESSED &&
  40       event->flags() & ui::EF_SHIFT_DOWN;
  41 }
  42
  43 bool SpokenFeedbackToggler::ShouldStopEventPropagation() const {
  44   // Let hotkey events pass through. See http://crbug.com/526729
  45   return false;
  46 }
  47
  48 void SpokenFeedbackToggler::OnKeyHold(const ui::KeyEvent* event) {
  49   if (!toggled_) {
  50     toggled_ = true;
  51     Shell::GetInstance()->accessibility_delegate()->
  52         ToggleSpokenFeedback(ui::A11Y_NOTIFICATION_SHOW);
  53   }
  54 }
  55
  56 void SpokenFeedbackToggler::OnKeyUnhold(const ui::KeyEvent* event) {
  57   toggled_ = false;
  58 }
  59
  60 SpokenFeedbackToggler::SpokenFeedbackToggler() : toggled_(false) {}
  61
  62 SpokenFeedbackToggler::~SpokenFeedbackToggler() {}
  63
  64 }  // namespace ash