src/servers/app/ScreenManager.h

   1 /*
   2  * Copyright 2005, Haiku.
   3  * Distributed under the terms of the MIT License.
   4  *
   5  * Authors:
   6  *              Axel Dörfler, axeld@pinc-software.de
   7  */
   8 #ifndef SCREEN_MANAGER_H
   9 #define SCREEN_MANAGER_H
  10
  11
  12 #include <Looper.h>
  13 #include <ObjectList.h>
  14
  15
  16 class BMessage;
  17
  18 class DrawingEngine;
  19 class HWInterface;
  20 class HWInterfaceListener;
  21 class Screen;
  22
  23
  24 typedef BObjectList<Screen> ScreenList;
  25
  26
  27 class ScreenOwner {
  28         public:
  29                 virtual ~ScreenOwner() {};
  30                 virtual void    ScreenRemoved(Screen* screen) = 0;
  31                 virtual void    ScreenAdded(Screen* screen) = 0;
  32                 virtual void    ScreenChanged(Screen* screen) = 0;
  33
  34                 virtual bool    ReleaseScreen(Screen* screen) = 0;
  35 };
  36
  37
  38 class ScreenManager : public BLooper {
  39         public:
  40                 ScreenManager();
  41                 virtual ~ScreenManager();
  42
  43                 Screen*                 ScreenAt(int32 index) const;
  44                 int32                   CountScreens() const;
  45
  46                 status_t                AcquireScreens(ScreenOwner* owner, int32* wishList,
  47                                                         int32 wishCount, const char* target, bool force,
  48                                                         ScreenList& list);
  49                 void                    ReleaseScreens(ScreenList& list);
  50
  51                 void                    ScreenChanged(Screen* screen);
  52
  53                 virtual void    MessageReceived(BMessage* message);
  54
  55         private:
  56                 struct screen_item {
  57                         Screen*                                 screen;
  58                         ScreenOwner*                    owner;
  59                         HWInterfaceListener*    listener;
  60                 };
  61
  62                 void                    _ScanDrivers();
  63                 screen_item*    _AddHWInterface(HWInterface* interface);
  64
  65                 BObjectList<screen_item>        fScreenList;
  66 };
  67
  68 extern ScreenManager *gScreenManager;
  69
  70 #endif  /* SCREEN_MANAGER_H */