src/preferences/virtualmemory/Settings.h

   1 /*
   2  * Copyright 2005, Axel Dörfler, axeld@pinc-software.de
   3  * All rights reserved. Distributed under the terms of the MIT License.
   4  *
   5  * Copyright 2010-2012 Haiku, Inc. All rights reserved.
   6  * Distributed under the terms of the MIT License.
   7  *
   8  * Authors:
   9  *      Hamish Morrison, hamish@lavabit.com
  10  *      Alexander von Gluck, kallisti5@unixzen.com
  11  */
  12 #ifndef SETTINGS_H
  13 #define SETTINGS_H
  14
  15
  16 #include <stdio.h>
  17 #include <stdlib.h>
  18
  19 #include <Point.h>
  20
  21
  22 static const int32 kErrorSettingsNotFound = B_ERRORS_END + 1;
  23 static const int32 kErrorSettingsInvalid = B_ERRORS_END + 2;
  24 static const int32 kErrorVolumeNotFound = B_ERRORS_END + 3;
  25
  26
  27 class Settings {
  28 public:
  29                                                         Settings();
  30
  31                         bool                    SwapEnabled() const
  32                                                                 { return fCurrentSettings.enabled; }
  33                         bool                    SwapAutomatic() const
  34                                                                 { return fCurrentSettings.automatic; }
  35                         off_t                   SwapSize() const { return fCurrentSettings.size; }
  36                         dev_t                   SwapVolume() { return fCurrentSettings.volume; }
  37                         BPoint                  WindowPosition() const { return fWindowPosition; }
  38
  39
  40                         void                    SetSwapEnabled(bool enabled,
  41                                                                 bool revertable = true);
  42                         void                    SetSwapAutomatic(bool automatic,
  43                                                                 bool revertable = true);
  44                         void                    SetSwapSize(off_t size, bool revertable = true);
  45                         void                    SetSwapVolume(dev_t volume,
  46                                                                 bool revertable = true);
  47                         void                    SetWindowPosition(BPoint position);
  48
  49                         status_t                ReadWindowSettings();
  50                         status_t                WriteWindowSettings();
  51                         status_t                ReadSwapSettings();
  52                         status_t                WriteSwapSettings();
  53
  54                         bool                    IsRevertable();
  55                         void                    RevertSwapSettings();
  56
  57                         bool                    IsDefaultable();
  58                         void                    DefaultSwapSettings(bool revertable = true);
  59 private:
  60                         struct SwapSettings {
  61                                 bool enabled;
  62                                 bool automatic;
  63                                 off_t size;
  64                                 dev_t volume;
  65                         };
  66
  67                         BPoint                  fWindowPosition;
  68
  69                         SwapSettings    fCurrentSettings;
  70                         SwapSettings    fInitialSettings;
  71                         SwapSettings    fDefaultSettings;
  72 };
  73
  74 #endif  /* SETTINGS_H */