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-rw-r--r--accessible/xpcom/xpcAccessibilityService.h68
1 files changed, 68 insertions, 0 deletions
diff --git a/accessible/xpcom/xpcAccessibilityService.h b/accessible/xpcom/xpcAccessibilityService.h
new file mode 100644
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+++ b/accessible/xpcom/xpcAccessibilityService.h
@@ -0,0 +1,68 @@
+/* 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 "nsITimer.h"
+
+class xpcAccessibilityService : public nsIAccessibilityService {
+ public:
+ NS_DECL_ISUPPORTS
+ NS_DECL_NSIACCESSIBILITYSERVICE
+
+ /**
+ * 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() = default;
+
+ 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