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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/accessibility/ax_main_node_annotator_controller.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/screen_ai/screen_ai_service_router.h"
#include "chrome/browser/screen_ai/screen_ai_service_router_factory.h"
#include "chrome/browser/ui/browser_list.h"
#include "chrome/browser/ui/views/frame/browser_view.h"
#include "chrome/common/pref_names.h"
#include "chrome/grit/generated_resources.h"
#include "components/prefs/pref_service.h"
#include "content/public/browser/browser_accessibility_state.h"
#include "content/public/browser/scoped_accessibility_mode.h"
#include "ui/accessibility/platform/ax_platform.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/views/accessibility/view_accessibility.h"
namespace {
// Invoke screen reader alert to notify the user of the state.
void AnnounceToScreenReader(const int message_id) {
const Browser* browser = BrowserList::GetInstance()->GetLastActive();
if (!browser) {
VLOG(2) << "Browser is not ready to announce";
return;
}
BrowserView* browser_view = BrowserView::GetBrowserViewForBrowser(browser);
if (!browser_view) {
VLOG(2) << "Browser is not ready to announce";
return;
}
browser_view->GetViewAccessibility().AnnounceText(
l10n_util::GetStringUTF16(message_id));
}
} // namespace
namespace screen_ai {
AXMainNodeAnnotatorController::AXMainNodeAnnotatorController(Profile* profile)
: profile_(profile) {
// Initialize an observer for changes of AX Main Node Annotation pref.
DCHECK(profile_);
VLOG(2) << "Init AXMainNodeAnnotatorController";
pref_change_registrar_.Init(profile_->GetPrefs());
pref_change_registrar_.Add(
prefs::kAccessibilityMainNodeAnnotationsEnabled,
base::BindRepeating(
&AXMainNodeAnnotatorController::OnAXMainNodeAnnotationsEnabledChanged,
weak_ptr_factory_.GetWeakPtr()));
// Register for changes to screenreader/spoken feedback.
ax_mode_observation_.Observe(&ui::AXPlatform::GetInstance());
activated_ = ui::AXPlatform::GetInstance().IsScreenReaderActive();
OnActivationChanged();
}
AXMainNodeAnnotatorController::~AXMainNodeAnnotatorController() = default;
bool AXMainNodeAnnotatorController::IsEnabled() const {
return scoped_accessibility_mode_ != nullptr;
}
void AXMainNodeAnnotatorController::OnAXMainNodeAnnotationsEnabledChanged() {
const auto& pref_value = profile_->GetPrefs()->GetValue(
prefs::kAccessibilityMainNodeAnnotationsEnabled);
VLOG(2) << "AXMainNode annotations enabled changed: " << pref_value.GetBool();
OnActivationChanged();
}
void AXMainNodeAnnotatorController::OnActivationChanged() {
const bool is_activated =
activated_ && profile_->GetPrefs()->GetBoolean(
prefs::kAccessibilityMainNodeAnnotationsEnabled);
if (is_activated == IsEnabled()) {
return; // No change in activation.
}
if (is_activated) {
if (!service_ready_) {
// Avoid repeated requests.
if (waiting_for_service_initialization_) {
return;
}
waiting_for_service_initialization_ = true;
if (ScreenAIInstallState::GetInstance()->get_state() !=
ScreenAIInstallState::State::kDownloaded &&
!component_ready_observer_.IsObserving()) {
// Start observing ScreenAIInstallState to report it to user.
component_ready_observer_.Observe(ScreenAIInstallState::GetInstance());
}
screen_ai::ScreenAIServiceRouterFactory::GetForBrowserContext(profile_)
->GetServiceStateAsync(
ScreenAIServiceRouter::Service::kMainContentExtraction,
base::BindOnce(
&AXMainNodeAnnotatorController::
MainNodeExtractionServiceInitializationCallback,
weak_ptr_factory_.GetWeakPtr()));
return;
}
// This will send the `kAnnotateMainNode` flag to all WebContents.
scoped_accessibility_mode_ =
content::BrowserAccessibilityState::GetInstance()
->CreateScopedModeForBrowserContext(profile_,
ui::AXMode::kAnnotateMainNode);
} else {
scoped_accessibility_mode_.reset();
}
}
void AXMainNodeAnnotatorController::
MainNodeExtractionServiceInitializationCallback(bool successful) {
waiting_for_service_initialization_ = false;
service_ready_ = successful;
if (successful) {
OnActivationChanged();
} else {
// Call `StateChanged` to announce the state to user.
StateChanged(ScreenAIInstallState::State::kDownloadFailed);
}
// No more need for observing Screen AI state changes.
component_ready_observer_.Reset();
}
void AXMainNodeAnnotatorController::StateChanged(
ScreenAIInstallState::State state) {
switch (state) {
case ScreenAIInstallState::State::kNotDownloaded:
break;
case ScreenAIInstallState::State::kDownloading:
AnnounceToScreenReader(IDS_SETTINGS_MAIN_NODE_ANNOTATIONS_DOWNLOADING);
break;
case ScreenAIInstallState::State::kDownloadFailed:
AnnounceToScreenReader(IDS_SETTINGS_MAIN_NODE_ANNOTATIONS_DOWNLOAD_ERROR);
// Update the main node annotations pref to be false to toggle off the
// button.
profile_->GetPrefs()->SetBoolean(
prefs::kAccessibilityMainNodeAnnotationsEnabled, false);
break;
case ScreenAIInstallState::State::kDownloaded:
AnnounceToScreenReader(
IDS_SETTINGS_MAIN_NODE_ANNOTATIONS_DOWNLOAD_COMPLETE);
break;
}
}
void AXMainNodeAnnotatorController::Activate() {
activated_ = true;
OnActivationChanged();
}
void AXMainNodeAnnotatorController::OnAssistiveTechChanged(
ui::AssistiveTech assistive_tech) {
activated_ = ui::IsScreenReader(assistive_tech);
OnActivationChanged();
}
} // namespace screen_ai
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