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      1 /*
      2  * Copyright (C) 2009 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef GeolocationController_h
     27 #define GeolocationController_h
     28 
     29 #include "core/page/Page.h"
     30 #include "core/page/PageLifecycleObserver.h"
     31 #include "modules/geolocation/Geolocation.h"
     32 #include "wtf/HashSet.h"
     33 #include "wtf/Noncopyable.h"
     34 #include "wtf/RefPtr.h"
     35 
     36 namespace WebCore {
     37 
     38 class GeolocationClient;
     39 class GeolocationError;
     40 class GeolocationPosition;
     41 class Page;
     42 
     43 class GeolocationController : public Supplement<Page>, public PageLifecycleObserver {
     44     WTF_MAKE_NONCOPYABLE(GeolocationController);
     45 public:
     46     ~GeolocationController();
     47 
     48     static PassOwnPtr<GeolocationController> create(Page*, GeolocationClient*);
     49 
     50     void addObserver(Geolocation*, bool enableHighAccuracy);
     51     void removeObserver(Geolocation*);
     52 
     53     void requestPermission(Geolocation*);
     54     void cancelPermissionRequest(Geolocation*);
     55 
     56     void positionChanged(GeolocationPosition*);
     57     void errorOccurred(GeolocationError*);
     58 
     59     GeolocationPosition* lastPosition();
     60 
     61     // Inherited from PageLifecycleObserver.
     62     virtual void pageVisibilityChanged() OVERRIDE;
     63 
     64     static const char* supplementName();
     65     static GeolocationController* from(Page* page) { return static_cast<GeolocationController*>(Supplement<Page>::from(page, supplementName())); }
     66 
     67 private:
     68     GeolocationController(Page*, GeolocationClient*);
     69 
     70     void startUpdatingIfNeeded();
     71     void stopUpdatingIfNeeded();
     72 
     73     GeolocationClient* m_client;
     74 
     75     RefPtr<GeolocationPosition> m_lastPosition;
     76     typedef HashSet<RefPtr<Geolocation> > ObserversSet;
     77     // All observers; both those requesting high accuracy and those not.
     78     ObserversSet m_observers;
     79     ObserversSet m_highAccuracyObservers;
     80     bool m_isClientUpdating;
     81 };
     82 
     83 } // namespace WebCore
     84 
     85 #endif // GeolocationController_h
     86