widget/windows/nsUserIdleServiceWin.h

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim:expandtab:shiftwidth=4:tabstop=4:
   3  */
   4 /* This Source Code Form is subject to the terms of the Mozilla Public
   5  * License, v. 2.0. If a copy of the MPL was not distributed with this
   6  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   7
   8 #ifndef nsUserIdleServiceWin_h__
   9 #define nsUserIdleServiceWin_h__
  10
  11 #include "nsUserIdleService.h"
  12
  13 /* NOTE: Compare of GetTickCount() could overflow.  This corrects for
  14  * overflow situations.
  15  ***/
  16 #ifndef SAFE_COMPARE_EVEN_WITH_WRAPPING
  17 #  define SAFE_COMPARE_EVEN_WITH_WRAPPING(A, B) \
  18     (((int)((long)A - (long)B) & 0xFFFFFFFF))
  19 #endif
  20
  21 class nsUserIdleServiceWin : public nsUserIdleService {
  22  public:
  23   NS_INLINE_DECL_REFCOUNTING_INHERITED(nsUserIdleServiceWin, nsUserIdleService)
  24
  25   bool PollIdleTime(uint32_t* aIdleTime) override;
  26
  27   static already_AddRefed<nsUserIdleServiceWin> GetInstance() {
  28     RefPtr<nsUserIdleServiceWin> idleService =
  29         nsUserIdleService::GetInstance().downcast<nsUserIdleServiceWin>();
  30     if (!idleService) {
  31       idleService = new nsUserIdleServiceWin();
  32     }
  33
  34     return idleService.forget();
  35   }
  36
  37  protected:
  38   nsUserIdleServiceWin() {}
  39   virtual ~nsUserIdleServiceWin() {}
  40   bool UsePollMode() override;
  41 };
  42
  43 #endif  // nsUserIdleServiceWin_h__