Merge pull request #6446 from electron/accessibility-api

Add API for Chrome's accessibility support state

atom/browser/api/atom_api_app.cc

@@ -32,6 +32,7 @@
 #include "base/strings/string_util.h"
 #include "brightray/browser/brightray_paths.h"
 #include "chrome/common/chrome_paths.h"
+#include "content/public/browser/browser_accessibility_state.h"
 #include "content/public/browser/client_certificate_delegate.h"
 #include "content/public/browser/gpu_data_manager.h"
 #include "content/public/browser/render_frame_host.h"
@@ -281,6 +282,10 @@ void App::OnFinishLaunching() {
   Emit("ready");
 }
 
+void App::OnAccessibilitySupportChanged() {
+  Emit("accessibility-support-changed", IsAccessibilitySupportEnabled());
+}
+
 #if defined(OS_MACOSX)
 void App::OnContinueUserActivity(
     bool* prevent_default,
@@ -486,6 +491,11 @@ void App::DisableHardwareAcceleration(mate::Arguments* args) {
   content::GpuDataManager::GetInstance()->DisableHardwareAcceleration();
 }
 
+bool App::IsAccessibilitySupportEnabled() {
+  auto ax_state = content::BrowserAccessibilityState::GetInstance();
+  return ax_state->IsAccessibleBrowser();
+}
+
 #if defined(USE_NSS_CERTS)
 void App::ImportCertificate(
     const base::DictionaryValue& options,
@@ -578,6 +588,8 @@ void App::BuildPrototype(
       .SetMethod("makeSingleInstance", &App::MakeSingleInstance)
       .SetMethod("releaseSingleInstance", &App::ReleaseSingleInstance)
       .SetMethod("relaunch", &App::Relaunch)
+      .SetMethod("isAccessibilitySupportEnabled",
+                 &App::IsAccessibilitySupportEnabled)
       .SetMethod("disableHardwareAcceleration",
                  &App::DisableHardwareAcceleration);
 }

atom/browser/api/atom_api_app.h

@@ -72,6 +72,7 @@ class App : public AtomBrowserClient::Delegate,
   void OnFinishLaunching() override;
   void OnLogin(LoginHandler* login_handler,
                const base::DictionaryValue& request_details) override;
+  void OnAccessibilitySupportChanged() override;
 #if defined(OS_MACOSX)
   void OnContinueUserActivity(
       bool* prevent_default,
@@ -113,6 +114,7 @@ class App : public AtomBrowserClient::Delegate,
   void ReleaseSingleInstance();
   bool Relaunch(mate::Arguments* args);
   void DisableHardwareAcceleration(mate::Arguments* args);
+  bool IsAccessibilitySupportEnabled();
 #if defined(USE_NSS_CERTS)
   void ImportCertificate(const base::DictionaryValue& options,
                          const net::CompletionCallback& callback);

atom/browser/browser.cc

@@ -155,6 +155,12 @@ void Browser::DidFinishLaunching() {
   FOR_EACH_OBSERVER(BrowserObserver, observers_, OnFinishLaunching());
 }
 
+void Browser::OnAccessibilitySupportChanged() {
+  FOR_EACH_OBSERVER(BrowserObserver,
+                    observers_,
+                    OnAccessibilitySupportChanged());
+}
+
 void Browser::RequestLogin(
     LoginHandler* login_handler,
     std::unique_ptr<base::DictionaryValue> request_details) {

atom/browser/browser.h

@@ -185,6 +185,8 @@ class Browser : public WindowListObserver {
   void WillFinishLaunching();
   void DidFinishLaunching();
 
+  void OnAccessibilitySupportChanged();
+
   // Request basic auth login.
   void RequestLogin(LoginHandler* login_handler,
                     std::unique_ptr<base::DictionaryValue> request_details);

atom/browser/browser_observer.h

@@ -52,6 +52,9 @@ class BrowserObserver {
   virtual void OnLogin(LoginHandler* login_handler,
                        const base::DictionaryValue& request_details) {}
 
+  // The browser's accessibility suppport has changed.
+  virtual void OnAccessibilitySupportChanged() {}
+
 #if defined(OS_MACOSX)
   // The browser wants to resume a user activity via handoff. (macOS only)
   virtual void OnContinueUserActivity(

atom/browser/mac/atom_application.mm

@@ -83,6 +83,8 @@
   } else {
     ax_state->DisableAccessibility();
   }
+
+  atom::Browser::Get()->OnAccessibilitySupportChanged();
 }
 
 @end

atom/browser/native_window_views_win.cc

@@ -2,6 +2,7 @@
 // Use of this source code is governed by the MIT license that can be
 // found in the LICENSE file.
 
+#include "atom/browser/browser.h"
 #include "atom/browser/native_window_views.h"
 #include "content/public/browser/browser_accessibility_state.h"
 
@@ -98,6 +99,7 @@ bool NativeWindowViews::PreHandleMSG(
         if (axState && !axState->IsAccessibleBrowser()) {
           axState->OnScreenReaderDetected();
           enabled_a11y_support_ = true;
+          Browser::Get()->OnAccessibilitySupportChanged();
         }
       }