michael@0: /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
michael@0: /* vim:expandtab:shiftwidth=4:tabstop=4:
michael@0:  */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef nsIdleServiceWin_h__
michael@0: #define nsIdleServiceWin_h__
michael@0: 
michael@0: #include "nsIdleService.h"
michael@0: 
michael@0: 
michael@0: /* NOTE: Compare of GetTickCount() could overflow.  This corrects for
michael@0: * overflow situations.
michael@0: ***/
michael@0: #ifndef SAFE_COMPARE_EVEN_WITH_WRAPPING
michael@0: #define SAFE_COMPARE_EVEN_WITH_WRAPPING(A, B) (((int)((long)A - (long)B) & 0xFFFFFFFF))
michael@0: #endif
michael@0: 
michael@0: 
michael@0: class nsIdleServiceWin : public nsIdleService
michael@0: {
michael@0: public:
michael@0:     NS_DECL_ISUPPORTS_INHERITED
michael@0: 
michael@0:     bool PollIdleTime(uint32_t* aIdleTime);
michael@0: 
michael@0:     static already_AddRefed<nsIdleServiceWin> GetInstance()
michael@0:     {
michael@0:         nsRefPtr<nsIdleServiceWin> idleService =
michael@0:             nsIdleService::GetInstance().downcast<nsIdleServiceWin>();
michael@0:         if (!idleService) {
michael@0:             idleService = new nsIdleServiceWin();
michael@0:         }
michael@0:         
michael@0:         return idleService.forget();
michael@0:     }
michael@0: 
michael@0: protected:
michael@0:     nsIdleServiceWin() { }
michael@0:     virtual ~nsIdleServiceWin() { }
michael@0:     bool UsePollMode();
michael@0: };
michael@0: 
michael@0: #endif // nsIdleServiceWin_h__