1 files changed, 73 insertions, 0 deletions
diff --git a/layout/xul/nsRepeatService.h b/layout/xul/nsRepeatService.h
new file mode 100644
index 0000000000..158e7ffd31
--- /dev/null
+++ b/layout/xul/nsRepeatService.h
@@ -0,0 +1,73 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+//
+// nsRepeatService
+//
+#ifndef nsRepeatService_h__
+#define nsRepeatService_h__
+
+#include "nsCOMPtr.h"
+#include "nsITimer.h"
+#include "nsString.h"
+
+#define INITAL_REPEAT_DELAY 250
+
+#ifdef XP_MACOSX
+#  define REPEAT_DELAY 25
+#else
+#  define REPEAT_DELAY 50
+#endif
+
+class nsITimer;
+
+namespace mozilla {
+namespace dom {
+class Document;
+}
+}  // namespace mozilla
+
+class nsRepeatService final {
+ public:
+  typedef void (*Callback)(void* aData);
+
+  ~nsRepeatService();
+
+  // Start dispatching timer events to the callback. There is no memory
+  // management of aData here; it is the caller's responsibility to call
+  // Stop() before aData's memory is released.
+  //
+  // aCallbackName is the label of the callback, used to pass to
+  // InitWithNamedCallbackFunc.
+  //
+  // aDocument is used to get the event target in Start(). We need an event
+  // target to init mRepeatTimer.
+  void Start(Callback aCallback, void* aCallbackData,
+             mozilla::dom::Document* aDocument, const nsACString& aCallbackName,
+             uint32_t aInitialDelay = INITAL_REPEAT_DELAY);
+  // Stop dispatching timer events to the callback. If the repeat service
+  // is not currently configured with the given callback and data, this
+  // is just ignored.
+  void Stop(Callback aCallback, void* aData);
+
+  static nsRepeatService* GetInstance();
+  static void Shutdown();
+
+ protected:
+  nsRepeatService();
+
+ private:
+  // helper function to initialize callback function to mRepeatTimer
+  void InitTimerCallback(uint32_t aInitialDelay);
+
+  Callback mCallback;
+  void* mCallbackData;
+  nsCString mCallbackName;
+  nsCOMPtr<nsITimer> mRepeatTimer;
+
+};  // class nsRepeatService
+
+#endif