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// Copyright 2019 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 "chrome/browser/accessibility/accessibility_labels_service.h"
#include "base/metrics/histogram_functions.h"
#include "build/build_config.h"
#include "chrome/browser/accessibility/accessibility_state_utils.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/ui/tab_contents/tab_contents_iterator.h"
#include "chrome/common/pref_names.h"
#include "components/pref_registry/pref_registry_syncable.h"
#include "components/prefs/pref_service.h"
#include "components/sync_preferences/pref_service_syncable.h"
#include "content/public/browser/browser_accessibility_state.h"
#include "content/public/common/content_features.h"
#include "ui/accessibility/ax_action_data.h"
#if !defined(OS_ANDROID)
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_finder.h"
#include "chrome/browser/ui/browser_list.h"
#endif
AccessibilityLabelsService::~AccessibilityLabelsService() {}
// static
void AccessibilityLabelsService::RegisterProfilePrefs(
user_prefs::PrefRegistrySyncable* registry) {
registry->RegisterBooleanPref(
prefs::kAccessibilityImageLabelsEnabled, false,
user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
registry->RegisterBooleanPref(
prefs::kAccessibilityImageLabelsOptInAccepted, false,
user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
}
// static
void AccessibilityLabelsService::InitOffTheRecordPrefs(
Profile* off_the_record_profile) {
DCHECK(off_the_record_profile->IsOffTheRecord());
off_the_record_profile->GetPrefs()->SetBoolean(
prefs::kAccessibilityImageLabelsEnabled, false);
off_the_record_profile->GetPrefs()->SetBoolean(
prefs::kAccessibilityImageLabelsOptInAccepted, false);
}
void AccessibilityLabelsService::Init() {
// Hidden behind a feature flag.
if (!base::FeatureList::IsEnabled(features::kExperimentalAccessibilityLabels))
return;
pref_change_registrar_.Init(profile_->GetPrefs());
pref_change_registrar_.Add(
prefs::kAccessibilityImageLabelsEnabled,
base::BindRepeating(
&AccessibilityLabelsService::OnImageLabelsEnabledChanged,
weak_factory_.GetWeakPtr()));
// Log whether the feature is enabled after startup. This must be run on the
// UI thread because it accesses prefs.
content::BrowserAccessibilityState::GetInstance()
->AddUIThreadHistogramCallback(base::BindRepeating(
&AccessibilityLabelsService::UpdateAccessibilityLabelsHistograms,
weak_factory_.GetWeakPtr()));
}
AccessibilityLabelsService::AccessibilityLabelsService(Profile* profile)
: profile_(profile) {}
ui::AXMode AccessibilityLabelsService::GetAXMode() {
ui::AXMode ax_mode =
content::BrowserAccessibilityState::GetInstance()->GetAccessibilityMode();
// Hidden behind a feature flag.
if (base::FeatureList::IsEnabled(
features::kExperimentalAccessibilityLabels)) {
bool enabled = profile_->GetPrefs()->GetBoolean(
prefs::kAccessibilityImageLabelsEnabled);
ax_mode.set_mode(ui::AXMode::kLabelImages, enabled);
}
return ax_mode;
}
void AccessibilityLabelsService::EnableLabelsServiceOnce() {
if (!accessibility_state_utils::IsScreenReaderEnabled()) {
return;
}
// TODO(crbug.com/905419): Implement for Android, which does not support
// BrowserList::GetInstance.
#if !defined(OS_ANDROID)
Browser* browser = chrome::FindLastActiveWithProfile(profile_);
if (!browser)
return;
auto* web_contents = browser->tab_strip_model()->GetActiveWebContents();
if (!web_contents)
return;
// Fire an AXAction on the active tab to enable this feature once only.
ui::AXActionData action_data;
action_data.action = ax::mojom::Action::kAnnotatePageImages;
for (content::RenderFrameHost* frame : web_contents->GetAllFrames()) {
if (frame->IsRenderFrameLive())
frame->AccessibilityPerformAction(action_data);
}
#endif
}
void AccessibilityLabelsService::OnImageLabelsEnabledChanged() {
// TODO(dmazzoni) Implement for Android, which doesn't support
// AllTabContentses(). crbug.com/905419
#if !defined(OS_ANDROID)
bool enabled = profile_->GetPrefs()->GetBoolean(
prefs::kAccessibilityImageLabelsEnabled) &&
accessibility_state_utils::IsScreenReaderEnabled();
for (auto* web_contents : AllTabContentses()) {
if (web_contents->GetBrowserContext() != profile_)
continue;
ui::AXMode ax_mode = web_contents->GetAccessibilityMode();
ax_mode.set_mode(ui::AXMode::kLabelImages, enabled);
web_contents->SetAccessibilityMode(ax_mode);
}
#endif
}
void AccessibilityLabelsService::UpdateAccessibilityLabelsHistograms() {
if (!profile_ || !profile_->GetPrefs())
return;
base::UmaHistogramBoolean("Accessibility.ImageLabels",
profile_->GetPrefs()->GetBoolean(
prefs::kAccessibilityImageLabelsEnabled));
}
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