/* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this file, * You can obtain one at http://mozilla.org/MPL/2.0/. */ #ifndef mozilla_a11y_xpcAccessibilityService_h_ #define mozilla_a11y_xpcAccessibilityService_h_ #include "nsIAccessibilityService.h" #include "nsCOMPtr.h" #include "nsITimer.h" class xpcAccessibilityService : public nsIAccessibleRetrieval { public: NS_DECL_ISUPPORTS NS_DECL_NSIACCESSIBILITYSERVICE NS_DECL_NSIACCESSIBLERETRIEVAL /** * Return true if xpc accessibility service is in use. */ static bool IsInUse() { // When ref count goes down to 1 (held internally as a static reference), // it means that there are no more external references and thus it is not in // use. return gXPCAccessibilityService ? gXPCAccessibilityService->mRefCnt > 1 : false; } protected: virtual ~xpcAccessibilityService() { if (mShutdownTimer) { mShutdownTimer->Cancel(); mShutdownTimer = nullptr; } gXPCAccessibilityService = nullptr; } private: // xpcAccessibilityService creation is controlled by friend // NS_GetAccessibilityService, keep constructor private. xpcAccessibilityService() { }; nsCOMPtr<nsITimer> mShutdownTimer; /** * Reference for xpc accessibility service instance. */ static xpcAccessibilityService* gXPCAccessibilityService; /** * Used to shutdown nsAccessibilityService if xpcom accessible service is not * in use any more. */ static void ShutdownCallback(nsITimer* aTimer, void* aClosure); friend nsresult NS_GetAccessibilityService(nsIAccessibilityService** aResult); }; // for component registration // {3b265b69-f813-48ff-880d-d88d101af404} #define NS_ACCESSIBILITY_SERVICE_CID \ { 0x3b265b69, 0xf813, 0x48ff, { 0x88, 0x0d, 0xd8, 0x8d, 0x10, 0x1a, 0xf4, 0x04 } } extern nsresult NS_GetAccessibilityService(nsIAccessibilityService** aResult); #endif