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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 "base/timer.h"
#include "content/browser/renderer_host/render_widget_host_impl.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/common/content_switches.h"
#include "ui/gfx/sys_color_change_listener.h"
#if defined(OS_WIN)
#include "base/win/windows_version.h"
#endif
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) {
#if defined(OS_WIN)
// On Windows 8, always enable accessibility for editable text controls
// so we can show the virtual keyboard when one is enabled.
if (base::win::GetVersion() >= base::win::VERSION_WIN8 &&
!CommandLine::ForCurrentProcess()->HasSwitch(
switches::kDisableRendererAccessibility)) {
accessibility_mode_ = AccessibilityModeEditableTextOnly;
}
#endif // defined(OS_WIN)
if (CommandLine::ForCurrentProcess()->HasSwitch(
switches::kForceRendererAccessibility)) {
accessibility_mode_ = AccessibilityModeComplete;
}
#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 (CommandLine::ForCurrentProcess()->HasSwitch(
switches::kDisableRendererAccessibility)) {
return;
}
SetAccessibilityMode(AccessibilityModeComplete);
}
void BrowserAccessibilityStateImpl::EnableAccessibility() {
// We may want to do something different with this later.
SetAccessibilityMode(AccessibilityModeComplete);
}
void BrowserAccessibilityStateImpl::DisableAccessibility() {
SetAccessibilityMode(AccessibilityModeOff);
}
bool BrowserAccessibilityStateImpl::IsAccessibleBrowser() {
return (accessibility_mode_ == 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",
CommandLine::ForCurrentProcess()->HasSwitch(
switches::kForceRendererAccessibility));
}
#if !defined(OS_WIN)
void BrowserAccessibilityStateImpl::UpdatePlatformSpecificHistograms() {
}
#endif
void BrowserAccessibilityStateImpl::SetAccessibilityMode(
AccessibilityMode mode) {
if (accessibility_mode_ == mode)
return;
accessibility_mode_ = mode;
for (RenderProcessHost::iterator it(RenderProcessHost::AllHostsIterator());
!it.IsAtEnd(); it.Advance()) {
RenderProcessHost* render_process_host = it.GetCurrentValue();
DCHECK(render_process_host);
// Ignore processes that don't have a connection, such as crashed tabs.
if (!render_process_host->HasConnection())
continue;
for (RenderProcessHost::RenderWidgetHostsIterator rwit(
render_process_host->GetRenderWidgetHostsIterator());
!rwit.IsAtEnd();
rwit.Advance()) {
RenderWidgetHost* rwh = const_cast<RenderWidgetHost*>(
rwit.GetCurrentValue());
DCHECK(rwh);
if (!rwh || !rwh->IsRenderView())
continue;
RenderWidgetHostImpl* rwhi = RenderWidgetHostImpl::From(rwh);
rwhi->SetAccessibilityMode(mode);
}
}
}
} // namespace content
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