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// Copyright 2014 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/touch_exploration_manager.h"
#include <memory>
#include <vector>
#include "ash/accessibility/accessibility_controller.h"
#include "ash/accessibility/chromevox/touch_exploration_controller.h"
#include "ash/accessibility/ui/accessibility_focus_ring_controller_impl.h"
#include "ash/constants/ash_switches.h"
#include "ash/keyboard/ui/keyboard_ui_controller.h"
#include "ash/public/cpp/accessibility_focus_ring_info.h"
#include "ash/root_window_controller.h"
#include "ash/shell.h"
#include "ash/wm/window_util.h"
#include "base/command_line.h"
#include "base/metrics/histogram_functions.h"
#include "chromeos/ash/components/audio/cras_audio_handler.h"
#include "chromeos/ash/components/audio/sounds.h"
#include "extensions/common/constants.h"
#include "ui/accessibility/ax_enums.mojom.h"
#include "ui/aura/client/aura_constants.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/wm/public/activation_client.h"
namespace ash {
namespace {
AccessibilityController* GetA11yController() {
return Shell::Get()->accessibility_controller();
}
} // namespace
TouchExplorationManager::TouchExplorationManager(
RootWindowController* root_window_controller)
: root_window_controller_(root_window_controller),
audio_handler_(CrasAudioHandler::Get()),
observing_window_(nullptr) {
Shell::Get()->AddShellObserver(this);
Shell::Get()->accessibility_controller()->AddObserver(this);
Shell::Get()->activation_client()->AddObserver(this);
keyboard::KeyboardUIController::Get()->AddObserver(this);
UpdateTouchExplorationState();
}
TouchExplorationManager::~TouchExplorationManager() {
// TODO(jamescook): Clean up shutdown order so this check isn't needed. See
// also the TODO in |OnAccessibilityControllerShutdown|.
if (Shell::Get()->accessibility_controller())
Shell::Get()->accessibility_controller()->RemoveObserver(this);
Shell::Get()->activation_client()->RemoveObserver(this);
keyboard::KeyboardUIController::Get()->RemoveObserver(this);
Shell::Get()->RemoveShellObserver(this);
if (observing_window_)
observing_window_->RemoveObserver(this);
}
void TouchExplorationManager::OnAccessibilityStatusChanged() {
UpdateTouchExplorationState();
}
void TouchExplorationManager::OnAccessibilityControllerShutdown() {
// This code helps with shutdown, but it does not obviate the need for similar
// code in |TouchExplorationManager::~TouchExplorationManager|. That is
// because there is a |TouchExplorationManager| per display, but only one
// |AccessibilityController|. If you disconnect an external display, then the
// corresponding |TouchExplorationManager| will be destroyed, but
// |OnAccessibilityControllerShutdown| will not be called thereon.
// TODO(jamescook): Clean up shutdown order so this code is not reached (and
// then remove it). See also the TODO in |~TouchExplorationManager|.
Shell::Get()->accessibility_controller()->RemoveObserver(this);
}
void TouchExplorationManager::OnWindowPropertyChanged(aura::Window* window,
const void* key,
intptr_t old) {
if (key != aura::client::kAccessibilityTouchExplorationPassThrough)
return;
UpdateTouchExplorationState();
}
void TouchExplorationManager::OnWindowDestroying(aura::Window* window) {
DCHECK(observing_window_ == window);
observing_window_->RemoveObserver(this);
observing_window_ = nullptr;
}
void TouchExplorationManager::SetOutputLevel(int volume) {
if (volume > 0) {
if (audio_handler_->IsOutputMuted()) {
audio_handler_->SetOutputMute(false);
}
}
audio_handler_->SetOutputVolumePercent(volume);
// Avoid negative volume.
if (audio_handler_->IsOutputVolumeBelowDefaultMuteLevel())
audio_handler_->SetOutputMute(true);
}
void TouchExplorationManager::SilenceSpokenFeedback() {
if (GetA11yController()->spoken_feedback().enabled())
GetA11yController()->SilenceSpokenFeedback();
}
void TouchExplorationManager::PlayVolumeAdjustEarcon() {
if (!VolumeAdjustSoundEnabled())
return;
if (!audio_handler_->IsOutputMuted() &&
audio_handler_->GetOutputVolumePercent() != 100) {
GetA11yController()->PlayEarcon(Sound::kVolumeAdjust);
}
}
void TouchExplorationManager::PlayPassthroughEarcon() {
GetA11yController()->PlayEarcon(Sound::kPassthrough);
}
void TouchExplorationManager::PlayLongPressRightClickEarcon() {
// TODO: Rename this sound to SOUND_LONG_PRESS_RIGHT_CLICK.
GetA11yController()->PlayEarcon(Sound::kExitScreen);
}
void TouchExplorationManager::PlayEnterScreenEarcon() {
GetA11yController()->PlayEarcon(Sound::kEnterScreen);
}
void TouchExplorationManager::HandleAccessibilityGesture(
ax::mojom::Gesture gesture,
gfx::PointF location) {
base::UmaHistogramEnumeration("Accessibility.ChromeVox.PerformGestureType",
gesture);
GetA11yController()->HandleAccessibilityGesture(gesture, location);
}
void TouchExplorationManager::OnDisplayMetricsChanged(
const display::Display& display,
uint32_t changed_metrics) {
const display::Display this_display =
display::Screen::GetScreen()->GetDisplayNearestWindow(
root_window_controller_->GetRootWindow());
if (this_display.id() == display.id())
UpdateTouchExplorationState();
}
void TouchExplorationManager::PlayTouchTypeEarcon() {
GetA11yController()->PlayEarcon(Sound::kTouchType);
}
void TouchExplorationManager::ToggleSpokenFeedback() {
if (GetA11yController()->ShouldToggleSpokenFeedbackViaTouch()) {
GetA11yController()->SetSpokenFeedbackEnabled(
!GetA11yController()->spoken_feedback().enabled(),
A11Y_NOTIFICATION_SHOW);
}
}
void TouchExplorationManager::OnWindowActivated(
::wm::ActivationChangeObserver::ActivationReason reason,
aura::Window* gained_active,
aura::Window* lost_active) {
if (lost_active && lost_active->HasObserver(this)) {
lost_active->RemoveObserver(this);
observing_window_ = nullptr;
}
if (gained_active && !gained_active->HasObserver(this)) {
gained_active->AddObserver(this);
observing_window_ = gained_active;
}
UpdateTouchExplorationState();
}
void TouchExplorationManager::SetTouchAccessibilityAnchorPoint(
const gfx::Point& anchor_point) {
if (touch_exploration_controller_) {
touch_exploration_controller_->SetTouchAccessibilityAnchorPoint(
anchor_point);
}
}
void TouchExplorationManager::OnKeyboardVisibleBoundsChanged(
const gfx::Rect& new_bounds) {
UpdateTouchExplorationState();
}
void TouchExplorationManager::OnKeyboardEnabledChanged(bool is_enabled) {
UpdateTouchExplorationState();
}
void TouchExplorationManager::UpdateTouchExplorationState() {
// See crbug.com/603745 for more details.
const bool pass_through_surface =
window_util::GetActiveWindow() &&
window_util::GetActiveWindow()->GetProperty(
aura::client::kAccessibilityTouchExplorationPassThrough);
const bool spoken_feedback_enabled =
GetA11yController()->spoken_feedback().enabled();
if (!touch_accessibility_enabler_) {
// Always enable gesture to toggle spoken feedback.
touch_accessibility_enabler_ = std::make_unique<TouchAccessibilityEnabler>(
root_window_controller_->GetRootWindow(), this);
}
if (spoken_feedback_enabled) {
if (!touch_exploration_controller_.get()) {
touch_exploration_controller_ =
std::make_unique<TouchExplorationController>(
root_window_controller_->GetRootWindow(), this,
touch_accessibility_enabler_->GetWeakPtr());
}
if (pass_through_surface) {
const display::Display display =
display::Screen::GetScreen()->GetDisplayNearestWindow(
root_window_controller_->GetRootWindow());
const gfx::Rect work_area = display.work_area();
touch_exploration_controller_->SetExcludeBounds(work_area);
SilenceSpokenFeedback();
// Clear the focus highlight.
Shell::Get()->accessibility_focus_ring_controller()->SetFocusRing(
extension_misc::kChromeVoxExtensionId,
std::make_unique<AccessibilityFocusRingInfo>());
} else {
touch_exploration_controller_->SetExcludeBounds(gfx::Rect());
}
// Virtual keyboard.
auto* keyboard_controller = keyboard::KeyboardUIController::Get();
if (keyboard_controller->IsEnabled()) {
touch_exploration_controller_->SetLiftActivationBounds(
keyboard_controller->GetVisualBoundsInScreen());
}
} else {
touch_exploration_controller_.reset();
}
}
bool TouchExplorationManager::VolumeAdjustSoundEnabled() {
return !base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kDisableVolumeAdjustSound);
}
} // namespace ash
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