SDLmm::Event(3)           OpenBSD Programmer's Manual          SDLmm::Event(3)



NAME
       SDLmm::Event - The general Event class.

SYNOPSIS
       #include <sdlmm_event.h>

   Public Methods
       bool Poll (bool fetch=true)
           Polls for currently pending events.
       bool Wait (bool fetch=true)
           Waits indefinitely for the next available event.
       bool Push ()
           Push this event onto the event queue.

   Static Public Methods
       Event Methods

           void PumpEvents ()
               Pumps the event loop, gathering events from the input devices.
           void SetEventFilter (SDL_EventFilter filter)
               Sets up a filter to process all events before they are posted
               to the event queue.
           SDL_EventFilter GetEventFilter ()
               Retrieves a pointer to the event filter.
           Uint8 EventState (Uint8 type, int state)
               Set the state of processing for certain events.
           void HandleEvents (EventHandler &handler)
               Handle all queued events using the specified EventHandler.

       Keyboard Methods

           Uint8* GetKeyState (int &numkeys)
               Get a snapshot of the current keyboard state.
           Uint8* GetKeyState ()
               Get a snapshot of the current keyboard state.
           SDLMod GetModState ()
               Get the state of modifier keys.
           void SetModState (SDLMod modstate)
               Set the current key modifier state.
           char* GetKeyName (SDLKey key)
               Get the name of an SDL virtual key symbol.
           bool EnableUNICODE (bool enable=true)
               Enable UNICODE keyboard translation.
           bool DisableUNICODE ()
               Disable UNICODE translation.
           bool QueryUNICODE ()
               Query the current UNICODE translation mode.
           bool EnableKeyRepeat (int delay=SDL_DEFAULT_REPEAT_DELAY, int
               interval=SDL_DEFAULT_REPEAT_DELAY)
               Set keyboard repeat rate.

       Mouse Methods

           Uint8 GetMouseState (int *x=0, int *y=0)
               Retrieve the current state of the mouse.
           Uint8 GetRelativeMouseState (int *x, int *y)
               Retrieve the current state of the mouse.

       Other Methods

           Uint8 GetAppState ()
               Get the state of the application.
           int JoystickEventState (int state)
               Enable / disable joystick event polling.

   Public Attributes
       SDL_Event me
           The event structure.

DETAILED DESCRIPTION
       The general Event class.

       The Event class is the core to all event handling is SDLmm. It's
       probably the most important class after Surface. The Event class can be
       used to store any type of event.

MEMBER FUNCTION DOCUMENTATION
   bool SDLmm::Event::DisableUNICODE () [inline, static]
       Disable UNICODE translation.

       Returns:
           true if UNICODE translation was previously enabled, false
           otherwise.

       See also:
           EnableUNICODE, QueryUNICODE

   bool SDLmm::Event::EnableKeyRepeat (int delay = SDL_DEFAULT_REPEAT_DELAY,
       int interval = SDL_DEFAULT_REPEAT_DELAY) [static]
       Set keyboard repeat rate.

       Enables or disables the keyboard repeat rate. delay specifies how long
       the key must be pressed before it begins repeating. It then repeats at
       the speed specified by interval. Both delay and interval are expressed
       in milliseconds.

       Setting delay to 0 disables key repeating completely. If called without
       parameters, the default values uses are SDL_DEFAULT_REPEAT_DELAY and
       SDL_DEFAULT_REPEAT_INTERVAL.

       Returns:
           true on success, false on failure.

       Parameters:

       delay  delay before key repeating starts in ms.

       interval
              delay between repeats in ms.

   bool SDLmm::Event::EnableUNICODE (bool enable = true) [inline, static]
       Enable UNICODE keyboard translation.

       If you wish to translate a keysym to it's printable representation, you
       need to enable UNICODE translation using this function and then look in
       the unicode member of the SDL_keysym structure. This value will be zero
       for keysyms that do not have a printable representation. UNICODE
       translation is disabled by default as the conversion can cause a slight
       overhead.

       Parameters:

       enable if false, disable UNICODE translation (SDL compatibility)

       Returns:
           true if UNICODE translation was previously enabled, false
           otherwise.

       See also:
           DisableUNICODE, QueryUNICODE

   Uint8 SDLmm::Event::EventState (Uint8 type, int state) [static]
       Set the state of processing for certain events.

       This function allows you to set the state of processing certain event
       types.

       If state is set to SDL_IGNORE, that event type will be automatically
       dropped from the event queue and will not be filtered.

       If state is set to SDL_ENABLE, that event type will be processed
       normally.

       If state is set to SDL_QUERY, EventState() will return the current
       processing state of the specified event type.

       A list of event types can be found in the SDL_Event section in the SDL
       documentation.

       Parameters:

       type   the event type

       state  the state as documented above.

       Returns:
           the current processing state for the specified event type

   Uint8 SDLmm::Event::GetAppState () [static]
       Get the state of the application.

       This function returns the current state of the application. The value
       returned is a bitwise combination of:

       SDL_APPMOUSEFOCUS -  the application has mouse focus.

       SDL_APPINPUTFOCUS -  the application has keyboard focus

       SDL_APPACTIVE -  the application is visible

       Returns:
           The current state of the application.

   SDL_EventFilter SDLmm::Event::GetEventFilter () [static]
       Retrieves a pointer to the event filter.

       This function retrieves a pointer to the event filter that was
       previously set using SetEventFilter(). An SDL_EventFilter function is
       defined as:

             typedef int (*SDL_EventFilter)(const SDL_Event *event);


       Returns:
           Returns a pointer to the event filter or 0 if no filter has been
           set.

       See also:
           SetEventFilter()

   char * SDLmm::Event::GetKeyName (SDLKey key) [static]
       Get the name of an SDL virtual key symbol.

       Returns:
           the SDL defined name of the key.

       Parameters:

       key    the SDLkey key symbol

   Uint8 * SDLmm::Event::GetKeyState () [static]
       Get a snapshot of the current keyboard state.

       Same as the GetKeyState(int &numkeys) method, used when you don't care
       how many keys were returned (i.e you want to check the state of a key
       that is known to exist).

       Example:


             Uint8 *keystate;
             keystate = Event::GetKeyState();
             if (keystate[SDLK_RETURN])
               cout << 'Return Key Pressed.0;


       See also:
           GetModState()

   Uint8 * SDLmm::Event::GetKeyState (int & numkeys) [static]
       Get a snapshot of the current keyboard state.

       Gets a snapshot of the current keyboard state. The current state is
       returned as a pointer to an array. The size of this array is stored in
       numkeys. The array is indexed by the SDLK_* symbols. A value of 1 means
       the key is pressed and a value of 0 means its not.

       Note:
           Use PumpEvents() to update the state array.

       See also:
           PumpEvents()

       Parameters:

       numkeys
              a reference to an integer used to store the size of the returned
              array.

   SDLMod SDLmm::Event::GetModState () [static]
       Get the state of modifier keys.

       Returns the current of the modifier keys (CTRL, ALT, etc.).

       Returns:
           The return value can be an OR'd combination of the SDLMod enum or
           one of the convenience defines:

       KMOD_NONE

       KMOD_LSHIFT

       KMOD_RSHIFT

       KMOD_LCTRL

       KMOD_RCTRL

       KMOD_LALT

       KMOD_RALT

       KMOD_LMETA

       KMOD_RMETA

       KMOD_NUM

       KMOD_CAPS

       KMOD_MODE

       KMOD_CTRL (KMOD_LCTRL | KMOD_RCTRL)

       KMOD_SHIFT (KMOD_LSHIFT | KMOD_RSHIFT)

       KMOD_ALT (KMOD_LALT | KMOD_RALT)

       KMOD_META (KMOD_LMETA | KMOD_RMETA)

       See also:
           SetModState(), GetModState()

   Uint8 SDLmm::Event::GetMouseState (int * x = 0, int * y = 0) [static]
       Retrieve the current state of the mouse.

       The current button state is returned as a button bitmask, which can be
       tested using the SDL_BUTTON(X) macros, and x and y are set to the
       current mouse cursor position. You can pass zero for either x or y.

       Returns:
           the button bitmask.

       Parameters:

       x, y   pointers to integers where the current mouse coordinates will be
              stored.

   Uint8 SDLmm::Event::GetRelativeMouseState (int * x, int * y) [static]
       Retrieve the current state of the mouse.

       The current button state is returned as a button bitmask, which can be
       tested using the SDL_BUTTON(X) macros, and x and y are set to the
       change in the mouse position since the last call to
       SDL_GetRelativeMouseState or since event initialization. You can pass
       zero for either x or y.

       Returns:
           the button bitmask.

       Parameters:

       x, y   pointers to integers for mouse coordinates or relative change.

   void SDLmm::Event::HandleEvents (EventHandler & handler) [static]
       Handle all queued events using the specified EventHandler.

       This function polls for active events and calls the event callback
       methods. To actually handle any events, you need to create a derivate
       of the EventHandler class reimplementing the callbacks for the events
       you're interested in. See the EventHandler documentation for more
       details.

       Parameters:

       handler
              the EventHandler which should handle the events.

       See also:
           EventHandler

   int SDLmm::Event::JoystickEventState (int state) [static]
       Enable / disable joystick event polling.

   bool SDLmm::Event::Poll (bool fetch = true)
       Polls for currently pending events.

       If there are any pending events, it will by default be removed from the
       queue and stored in this class instance.

       Parameters:

       fetch  if false, only poll for pending events but don't fetch it.

       Returns:
           true if any events were pending.

       See also:
           EventHandler, HandleEvents(), Wait()

   void SDLmm::Event::PumpEvents () [static]
       Pumps the event loop, gathering events from the input devices.

       PumpEvents() gathers all the pending input information from devices and
       places it on the event queue. Without calls to PumpEvents() no events
       would ever be placed on the queue. Often the calls to PumpEvents() is
       hidden from the user since Poll and Wait implicitly call Pump. However,
       if you are not polling or waiting for events (e.g. your filtering
       them), then you must call Pump to force an event queue update.

       Note:
           You can only call this function in the thread that set the video
           mode.

   bool SDLmm::Event::Push ()
       Push this event onto the event queue.

       The event queue can actually be used as a two way communication
       channel. Not only can events be read from the queue, but the user can
       also push their own events onto it.

       Note:
           Pushing device input events onto the queue doesn't modify the state
           of the device within SDL.

       Warning:
           Make sure to initialize the Event before pushing it!

       Returns:
           true on success, falese if the Event couldn't be pushed.

   bool SDLmm::Event::QueryUNICODE () [inline, static]
       Query the current UNICODE translation mode.

       This function checks whether UNICODE translation is enabled or
       disabled.

       Returns:
           true if UNICODE translation is enabled, false otherwise.

       See also:
           EnableUNICODE, DisableUNICODE

   void SDLmm::Event::SetEventFilter (SDL_EventFilter filter) [static]
       Sets up a filter to process all events before they are posted to the
       event queue.

       This function sets up a filter to process all events before they are
       posted to the event queue. This is a very powerful and flexible
       feature. The filter is prototyped as:

             typedef int (*SDL_EventFilter)(const SDL_Event *event);

       If the filter returns 1, then the event will be added to the internal
       queue. If it returns 0, then the event will be dropped from the queue.
       This allows selective filtering of dynamically.

       There is one caveat when dealing with the SDL_QUITEVENT event type. The
       event filter is only called when the window manager desires to close
       the application window. If the event filter returns 1, then the window
       will be closed, otherwise the window will remain open if possible. If
       the quit event is generated by an interrupt signal, it will bypass the
       internal queue and be delivered to the application at the next event
       poll.

       Note:
           Events pushed onto the queue with Push() or Peep() do not get
           passed through the event filter.

       Warning:
           Be careful! The event filter function may run in a different thread
           so be careful what you do within it.

       See also:
           GetEventFilter()

   void SDLmm::Event::SetModState (SDLMod modstate) [static]
       Set the current key modifier state.

       The inverse of GetModState(), SetModState() allows you to impose
       modifier key states on your application.

       Simply pass your desired modifier states into modstate. This value my
       be a logical OR'd combination of the symbols documented in
       GetModState().

       Parameters:

       modstate
              the new key modifier state.

       See also:
           GetModState()

   bool SDLmm::Event::Wait (bool fetch = true)
       Waits indefinitely for the next available event.

       This function will wait for an event to become available. It will not
       return until an event is queued.

       Parameters:

       fetch  if false, don't fetch and dequeue the event once it becomes
              available.

       Returns:
           true when an event became available and false if something went
           wrong.

       See also:
           EventHandler, HandleEvents(), Poll()

MEMBER DATA DOCUMENTATION
   SDL_Event SDLmm::Event::me
       The event structure.

       If you use the event polling method, this is where the result is
       stored. You should consider using the more elegant EventHandler method
       instead however.

       See also:
           EventHandler, HandleEvents(), Poll(), Wait()


AUTHOR
       Generated automatically by Doxygen for SDLmm from the source code.



SDLmm                             16 Jul 2001                  SDLmm::Event(3)
