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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/accessibility/browser_accessibility_state_impl.h"
#import <Cocoa/Cocoa.h>
#include <memory>
#include "base/debug/crash_logging.h"
#import "base/mac/mac_util.h"
#include "base/metrics/histogram_macros.h"
#include "content/browser/web_contents/web_contents_impl.h"
#include "content/public/browser/browser_thread.h"
#include "ui/gfx/animation/animation.h"
namespace content {
class BrowserAccessibilityStateImplMac : public BrowserAccessibilityStateImpl {
public:
BrowserAccessibilityStateImplMac();
~BrowserAccessibilityStateImplMac() override {}
protected:
void RefreshAssistiveTech() override;
};
BrowserAccessibilityStateImplMac::BrowserAccessibilityStateImplMac() {
// Set up accessibility notifications.
// Skip this in tests that don't set up a task runner on the main thread.
if (!base::SingleThreadTaskRunner::HasCurrentDefault()) {
return;
}
// We need to call into gfx::Animation and WebContentsImpl on the UI thread,
// so ensure that we setup the notification on the correct thread.
DCHECK_CURRENTLY_ON(BrowserThread::UI);
// Listen to accessibility display options changing, so that we can update
// the renderer for the prefers reduced motion settings.
//
// BrowserAccessibilityStateImpl is a deliberately leaked singleton, so we
// don't need to record the notification token for later cleanup.
[NSWorkspace.sharedWorkspace.notificationCenter
addObserverForName:
NSWorkspaceAccessibilityDisplayOptionsDidChangeNotification
object:nil
queue:nil
usingBlock:^(NSNotification* notification) {
gfx::Animation::UpdatePrefersReducedMotion();
NotifyWebContentsPreferencesChanged();
}];
// Set up KVO monitoring of VoiceOver state changes. KVO best practices
// recommend setting the context to the "address of a uniquely named
// static variable within the class". This allows observers to disambiguate
// notifications (where a class and its superclass, say, are observing the
// same property). We'll use the global accessibility object.
[[NSWorkspace sharedWorkspace] addObserver:NSApp
forKeyPath:@"voiceOverEnabled"
options:(NSKeyValueObservingOptionInitial |
NSKeyValueObservingOptionNew)
context:this];
}
void BrowserAccessibilityStateImplMac::RefreshAssistiveTech() {
bool is_active = GetAccessibilityMode().has_mode(ui::AXMode::kScreenReader);
static auto* ax_voiceover_crash_key = base::debug::AllocateCrashKeyString(
"ax_voiceover", base::debug::CrashKeySize::Size32);
if (is_active) {
base::debug::SetCrashKeyString(ax_voiceover_crash_key, "true");
} else {
base::debug::ClearCrashKeyString(ax_voiceover_crash_key);
}
UMA_HISTOGRAM_BOOLEAN("Accessibility.Mac.VoiceOver", is_active);
OnAssistiveTechFound(is_active ? ui::AssistiveTech::kVoiceOver
: ui::AssistiveTech::kNone);
}
// static
std::unique_ptr<BrowserAccessibilityStateImpl>
BrowserAccessibilityStateImpl::Create() {
return std::make_unique<BrowserAccessibilityStateImplMac>();
}
} // namespace content
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