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