interface/wx/power.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        power.h
   3 // Purpose:     interface of wxPowerEvent
   4 // Author:      wxWidgets team
   5 // RCS-ID:      $Id$
   6 // Licence:     wxWindows license
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9 /**
  10     @class wxPowerEvent
  11
  12     The power events are generated when the system power state changes, e.g. the
  13     system is suspended, hibernated, plugged into or unplugged from the wall socket
  14     and so on. wxPowerEvents are emitted by wxWindows.
  15
  16     Notice that currently only suspend and resume events are generated and only
  17     under MS Windows platform. To avoid the need to change the code using this
  18     event later when these events are implemented on the other platforms please
  19     use the test <tt>ifdef wxHAS_POWER_EVENTS</tt> instead of directly testing for
  20     the platform in your code: this symbol will be defined for all platforms
  21     supporting the power events.
  22
  23     @beginEventTable{wxPowerEvent}
  24     @event{EVT_POWER_SUSPENDING(func)}
  25            System is about to be suspended, this event can be vetoed to prevent
  26            suspend from taking place.
  27     @event{EVT_POWER_SUSPENDED(func)}
  28            System is about to suspend: normally the application should quickly
  29            (i.e. without user intervention) close all the open files and network
  30            connections here, possibly remembering them to reopen them later when
  31            the system is resumed.
  32     @event{EVT_POWER_SUSPEND_CANCEL(func)}
  33            System suspension was cancelled because some application vetoed it.
  34     @event{EVT_POWER_RESUME(func)}
  35            System resumed from suspend: normally the application should restore
  36            the state in which it had been before the suspension.
  37     @endEventTable
  38
  39     @library{wxbase}
  40     @category{events}
  41
  42     @see ::wxGetPowerType(), ::wxGetBatteryState()
  43 */
  44 class wxPowerEvent : public wxEvent
  45 {
  46 public:
  47     /**
  48         Call this to prevent suspend from taking place in @c wxEVT_POWER_SUSPENDING
  49         handler (it is ignored for all the others).
  50     */
  51     void Veto();
  52 };
  53