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// Copyright (c) 2012 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 "content/browser/accessibility/browser_accessibility_state_impl.h"
#include "base/command_line.h"
#include "base/metrics/histogram.h"
#include "content/browser/accessibility/accessibility_mode_helper.h"
#include "content/browser/renderer_host/render_widget_host_impl.h"
#include "content/browser/web_contents/web_contents_impl.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/common/content_switches.h"
#include "ui/gfx/sys_color_change_listener.h"
namespace content {
// Update the accessibility histogram 45 seconds after initialization.
static const int kAccessibilityHistogramDelaySecs = 45;
// static
BrowserAccessibilityState* BrowserAccessibilityState::GetInstance() {
return BrowserAccessibilityStateImpl::GetInstance();
}
// static
BrowserAccessibilityStateImpl* BrowserAccessibilityStateImpl::GetInstance() {
return Singleton<BrowserAccessibilityStateImpl,
LeakySingletonTraits<BrowserAccessibilityStateImpl> >::get();
}
BrowserAccessibilityStateImpl::BrowserAccessibilityStateImpl()
: BrowserAccessibilityState(),
accessibility_mode_(AccessibilityModeOff) {
ResetAccessibilityModeValue();
#if defined(OS_WIN)
// On Windows, UpdateHistograms calls some system functions with unknown
// runtime, so call it on the file thread to ensure there's no jank.
// Everything in that method must be safe to call on another thread.
BrowserThread::ID update_histogram_thread = BrowserThread::FILE;
#else
// On all other platforms, UpdateHistograms should be called on the main
// thread.
BrowserThread::ID update_histogram_thread = BrowserThread::UI;
#endif
// We need to AddRef() the leaky singleton so that Bind doesn't
// delete it prematurely.
AddRef();
BrowserThread::PostDelayedTask(
update_histogram_thread, FROM_HERE,
base::Bind(&BrowserAccessibilityStateImpl::UpdateHistograms, this),
base::TimeDelta::FromSeconds(kAccessibilityHistogramDelaySecs));
}
BrowserAccessibilityStateImpl::~BrowserAccessibilityStateImpl() {
}
void BrowserAccessibilityStateImpl::OnScreenReaderDetected() {
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kDisableRendererAccessibility)) {
return;
}
EnableAccessibility();
}
void BrowserAccessibilityStateImpl::EnableAccessibility() {
AddAccessibilityMode(AccessibilityModeComplete);
}
void BrowserAccessibilityStateImpl::DisableAccessibility() {
ResetAccessibilityMode();
}
void BrowserAccessibilityStateImpl::ResetAccessibilityModeValue() {
accessibility_mode_ = AccessibilityModeOff;
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kForceRendererAccessibility)) {
accessibility_mode_ = AccessibilityModeComplete;
}
}
void BrowserAccessibilityStateImpl::ResetAccessibilityMode() {
ResetAccessibilityModeValue();
std::vector<WebContentsImpl*> web_contents_vector =
WebContentsImpl::GetAllWebContents();
for (size_t i = 0; i < web_contents_vector.size(); ++i)
web_contents_vector[i]->SetAccessibilityMode(accessibility_mode());
}
bool BrowserAccessibilityStateImpl::IsAccessibleBrowser() {
return ((accessibility_mode_ & AccessibilityModeComplete) ==
AccessibilityModeComplete);
}
void BrowserAccessibilityStateImpl::AddHistogramCallback(
base::Closure callback) {
histogram_callbacks_.push_back(callback);
}
void BrowserAccessibilityStateImpl::UpdateHistogramsForTesting() {
UpdateHistograms();
}
void BrowserAccessibilityStateImpl::UpdateHistograms() {
UpdatePlatformSpecificHistograms();
for (size_t i = 0; i < histogram_callbacks_.size(); ++i)
histogram_callbacks_[i].Run();
UMA_HISTOGRAM_BOOLEAN("Accessibility.State", IsAccessibleBrowser());
UMA_HISTOGRAM_BOOLEAN("Accessibility.InvertedColors",
gfx::IsInvertedColorScheme());
UMA_HISTOGRAM_BOOLEAN("Accessibility.ManuallyEnabled",
base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kForceRendererAccessibility));
}
#if !defined(OS_WIN)
void BrowserAccessibilityStateImpl::UpdatePlatformSpecificHistograms() {
}
#endif
void BrowserAccessibilityStateImpl::AddAccessibilityMode(
AccessibilityMode mode) {
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kDisableRendererAccessibility)) {
return;
}
accessibility_mode_ =
content::AddAccessibilityModeTo(accessibility_mode_, mode);
AddOrRemoveFromAllWebContents(mode, true);
}
void BrowserAccessibilityStateImpl::RemoveAccessibilityMode(
AccessibilityMode mode) {
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kForceRendererAccessibility) &&
mode == AccessibilityModeComplete) {
return;
}
accessibility_mode_ =
content::RemoveAccessibilityModeFrom(accessibility_mode_, mode);
AddOrRemoveFromAllWebContents(mode, false);
}
void BrowserAccessibilityStateImpl::AddOrRemoveFromAllWebContents(
AccessibilityMode mode,
bool add) {
std::vector<WebContentsImpl*> web_contents_vector =
WebContentsImpl::GetAllWebContents();
for (size_t i = 0; i < web_contents_vector.size(); ++i) {
if (add)
web_contents_vector[i]->AddAccessibilityMode(mode);
else
web_contents_vector[i]->RemoveAccessibilityMode(mode);
}
}
} // namespace content
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