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Implement accessibility enhancements (issue #1217)

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- Add new CefBrowserHost::SetAccessibilityState method for toggling
  accessibility state when readers are detected by the client.
- Add new CefAccessibilityHandler interface for the delivery of
  accessibility notifications to windowless (OSR) clients.
- Fix delivery of CefFocusHandler callbacks to windowless clients.
- cefclient: Add example windowless accessibility implementation on Windows and macOS.
- cefclient: Automatically detect screen readers on Windows and macOS.
This commit is contained in:
Nishant Kaushik
2017-05-12 18:28:25 +00:00
committed by Marshall Greenblatt
parent 64fcfa6068
commit 816f700d3e
51 changed files with 3476 additions and 8 deletions
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56
libcef/browser/browser_host_impl.cc
View File

@ -46,6 +46,7 @@
#include "components/zoom/zoom_controller.h"
#include "content/browser/renderer_host/render_view_host_impl.h"
#include "content/browser/gpu/compositor_util.h"
#include "content/browser/web_contents/web_contents_impl.h"
#include "content/common/view_messages.h"
#include "content/public/browser/desktop_media_id.h"
#include "content/public/browser/download_manager.h"
@ -930,6 +931,39 @@ CefRefPtr<CefNavigationEntry> CefBrowserHostImpl::GetVisibleNavigationEntry() {
return new CefNavigationEntryImpl(entry);
}
void CefBrowserHostImpl::SetAccessibilityState(
cef_state_t accessibility_state) {
// Do nothing if state is set to default. It'll be disabled by default and
// controlled by the commmand-line flags "force-renderer-accessibility" and
// "disable-renderer-accessibility".
if (accessibility_state == STATE_DEFAULT)
return;
if (!CEF_CURRENTLY_ON_UIT()) {
CEF_POST_TASK(CEF_UIT,
base::Bind(&CefBrowserHostImpl::SetAccessibilityState,
this, accessibility_state));
return;
}
content::WebContentsImpl* web_contents_impl =
static_cast<content::WebContentsImpl*>(web_contents());
if (!web_contents_impl)
return;
content::AccessibilityMode accMode;
// In windowless mode set accessibility to TreeOnly mode. Else native
// accessibility APIs, specific to each platform, are also created.
if (accessibility_state == STATE_ENABLED) {
if (IsWindowless())
accMode = content::kAccessibilityModeWebContentsOnly;
else
accMode = content::kAccessibilityModeComplete;
}
web_contents_impl->SetAccessibilityMode(accMode);
}
void CefBrowserHostImpl::SetMouseCursorChangeDisabled(bool disabled) {
base::AutoLock lock_scope(state_lock_);
mouse_cursor_change_disabled_ = disabled;
@ -2690,6 +2724,28 @@ bool CefBrowserHostImpl::OnMessageReceived(const IPC::Message& message) {
return handled;
}
void CefBrowserHostImpl::AccessibilityEventReceived(
const std::vector<content::AXEventNotificationDetails>& eventData) {
// Only needed in windowless mode.
if (IsWindowless()) {
if (!web_contents() || !platform_delegate_)
return;
platform_delegate_->AccessibilityEventReceived(eventData);
}
}
void CefBrowserHostImpl::AccessibilityLocationChangesReceived(
const std::vector<content::AXLocationChangeNotificationDetails>& locData) {
// Only needed in windowless mode.
if (IsWindowless()) {
if (!web_contents() || !platform_delegate_)
return;
platform_delegate_->AccessibilityLocationChangesReceived(locData);
}
}
void CefBrowserHostImpl::OnWebContentsFocused() {
if (client_.get()) {
CefRefPtr<CefFocusHandler> handler = client_->GetFocusHandler();