Bug 1624729 - Notify observer service of mac accessibility events. r=morgan,yzen

Differential Revision: https://phabricator.services.mozilla.com/D68127

--HG--
extra : moz-landing-system : lando

accessible/mac/mozAccessible.mm

@@ -10,6 +10,7 @@
 
 #include "Accessible-inl.h"
 #include "nsAccUtils.h"
+#include "xpcAccessibleMacInterface.h"
 #include "nsIPersistentProperties2.h"
 #include "DocAccessibleParent.h"
 #include "Relation.h"
@@ -1176,6 +1177,9 @@ struct RoleDescrComparator {
 }
 
 - (void)postNotification:(NSString*)notification {
+  // This sends events via nsIObserverService to be consumed by our mochitests.
+  xpcAccessibleMacInterface::FireEvent(self, notification);
+
   if (gfxPlatform::IsHeadless()) {
     // Using a headless toolkit for tests and whatnot, posting accessibility
     // notification won't work.

accessible/xpcom/moz.build

@@ -52,6 +52,9 @@ elif CONFIG['MOZ_WIDGET_TOOLKIT'] == 'cocoa':
     UNIFIED_SOURCES += [
         'xpcAccessibleMacInterface.mm'
     ]
+    EXPORTS += [
+        'xpcAccessibleMacInterface.h',
+    ]
 elif CONFIG['MOZ_WIDGET_TOOLKIT'] == 'android':
     LOCAL_INCLUDES += [
         '/accessible/android',

accessible/xpcom/xpcAccessibleMacInterface.h

@@ -29,6 +29,11 @@ class xpcAccessibleMacInterface : public nsIAccessibleMacInterface {
   NS_DECL_ISUPPORTS
   NS_DECL_NSIACCESSIBLEMACINTERFACE
 
+  // This sends notifications via nsIObserverService to be consumed by our
+  // mochitests. aNativeObj is a NSAccessibility protocol object,
+  // and aNotification is a NSString.
+  static void FireEvent(id aNativeObj, id aNotification);
+
  protected:
   virtual ~xpcAccessibleMacInterface();
 

accessible/xpcom/xpcAccessibleMacInterface.mm

@@ -367,3 +367,22 @@ nsresult xpcAccessibleMacInterface::NSObjectToJsValue(id aObj, JSContext* aCx,
 
   return NS_OK;
 }
+
+void xpcAccessibleMacInterface::FireEvent(id aNativeObj, id aNotification) {
+  if (nsCOMPtr<nsIObserverService> obsService = services::GetObserverService()) {
+    nsCOMPtr<nsISimpleEnumerator> observers;
+    // Get all observers for the mac event topic.
+    obsService->EnumerateObservers(NS_ACCESSIBLE_MAC_EVENT_TOPIC, getter_AddRefs(observers));
+    if (observers) {
+      bool hasObservers = false;
+      observers->HasMoreElements(&hasObservers);
+      // If we have observers, notify them.
+      if (hasObservers) {
+        nsCOMPtr<nsIAccessibleMacInterface> xpcIface = new xpcAccessibleMacInterface(aNativeObj);
+        nsAutoString notificationStr;
+        nsCocoaUtils::GetStringForNSString(aNotification, notificationStr);
+        obsService->NotifyObservers(xpcIface, NS_ACCESSIBLE_MAC_EVENT_TOPIC, notificationStr.get());
+      }
+    }
+  }
+}