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  1. /*
  2.     SDL - Simple DirectMedia Layer
  3.     Copyright (C) 1997, 1998, 1999, 2000, 2001  Sam Lantinga
  4.  
  5.     This library is free software; you can redistribute it and/or
  6.     modify it under the terms of the GNU Library General Public
  7.     License as published by the Free Software Foundation; either
  8.     version 2 of the License, or (at your option) any later version.
  9.  
  10.     This library is distributed in the hope that it will be useful,
  11.     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12.     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13.     Library General Public License for more details.
  14.  
  15.     You should have received a copy of the GNU Library General Public
  16.     License along with this library; if not, write to the Free
  17.     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18.  
  19.     Sam Lantinga
  20.     slouken@devolution.com
  21. */
  22.  
  23. #ifdef SAVE_RCSID
  24. static char rcsid =
  25.  "@(#) $Id: SDL_events.h,v 1.2 2001/04/26 16:50:17 hercules Exp $";
  26. #endif
  27.  
  28. /* Include file for SDL event handling */
  29.  
  30. #ifndef _SDL_events_h
  31. #define _SDL_events_h
  32.  
  33. #include "SDL_types.h"
  34. #include "SDL_active.h"
  35. #include "SDL_keyboard.h"
  36. #include "SDL_mouse.h"
  37. #include "SDL_joystick.h"
  38. #include "SDL_quit.h"
  39.  
  40. #include "begin_code.h"
  41. /* Set up for C function definitions, even when using C++ */
  42. #ifdef __cplusplus
  43. extern "C" {
  44. #endif
  45.  
  46. /* Event enumerations */
  47. enum { SDL_NOEVENT = 0,                 /* Unused (do not remove) */
  48.        SDL_ACTIVEEVENT,                 /* Application loses/gains visibility */
  49.        SDL_KEYDOWN,                     /* Keys pressed */
  50.        SDL_KEYUP,                       /* Keys released */
  51.        SDL_MOUSEMOTION,                 /* Mouse moved */
  52.        SDL_MOUSEBUTTONDOWN,             /* Mouse button pressed */
  53.        SDL_MOUSEBUTTONUP,               /* Mouse button released */
  54.        SDL_JOYAXISMOTION,               /* Joystick axis motion */
  55.        SDL_JOYBALLMOTION,               /* Joystick trackball motion */
  56.        SDL_JOYHATMOTION,                /* Joystick hat position change */
  57.        SDL_JOYBUTTONDOWN,               /* Joystick button pressed */
  58.        SDL_JOYBUTTONUP,                 /* Joystick button released */
  59.        SDL_QUIT,                        /* User-requested quit */
  60.        SDL_SYSWMEVENT,                  /* System specific event */
  61.        SDL_EVENT_RESERVEDA,             /* Reserved for future use.. */
  62.        SDL_EVENT_RESERVEDB,             /* Reserved for future use.. */
  63.        SDL_VIDEORESIZE,                 /* User resized video mode */
  64.        SDL_VIDEOEXPOSE,                 /* Screen needs to be redrawn */
  65.        SDL_EVENT_RESERVED2,             /* Reserved for future use.. */
  66.        SDL_EVENT_RESERVED3,             /* Reserved for future use.. */
  67.        SDL_EVENT_RESERVED4,             /* Reserved for future use.. */
  68.        SDL_EVENT_RESERVED5,             /* Reserved for future use.. */
  69.        SDL_EVENT_RESERVED6,             /* Reserved for future use.. */
  70.        SDL_EVENT_RESERVED7,             /* Reserved for future use.. */
  71.        /* Events SDL_USEREVENT through SDL_MAXEVENTS-1 are for your use */
  72.        SDL_USEREVENT = 24,
  73.        SDL_PAINT_WND = 31,
  74.        /* This last event is only for bounding internal arrays
  75.           It is the number of bits in the event mask datatype -- Uint32
  76.         */
  77.        SDL_NUMEVENTS = 32
  78. };
  79.  
  80. /* Predefined event masks */
  81. #define SDL_EVENTMASK(X)        (1<<(X))
  82. enum {
  83.         SDL_ACTIVEEVENTMASK     = SDL_EVENTMASK(SDL_ACTIVEEVENT),
  84.         SDL_KEYDOWNMASK         = SDL_EVENTMASK(SDL_KEYDOWN),
  85.         SDL_KEYUPMASK           = SDL_EVENTMASK(SDL_KEYUP),
  86.         SDL_MOUSEMOTIONMASK     = SDL_EVENTMASK(SDL_MOUSEMOTION),
  87.         SDL_MOUSEBUTTONDOWNMASK = SDL_EVENTMASK(SDL_MOUSEBUTTONDOWN),
  88.         SDL_MOUSEBUTTONUPMASK   = SDL_EVENTMASK(SDL_MOUSEBUTTONUP),
  89.         SDL_MOUSEEVENTMASK      = SDL_EVENTMASK(SDL_MOUSEMOTION)|
  90.                                   SDL_EVENTMASK(SDL_MOUSEBUTTONDOWN)|
  91.                                   SDL_EVENTMASK(SDL_MOUSEBUTTONUP),
  92.         SDL_JOYAXISMOTIONMASK   = SDL_EVENTMASK(SDL_JOYAXISMOTION),
  93.         SDL_JOYBALLMOTIONMASK   = SDL_EVENTMASK(SDL_JOYBALLMOTION),
  94.         SDL_JOYHATMOTIONMASK    = SDL_EVENTMASK(SDL_JOYHATMOTION),
  95.         SDL_JOYBUTTONDOWNMASK   = SDL_EVENTMASK(SDL_JOYBUTTONDOWN),
  96.         SDL_JOYBUTTONUPMASK     = SDL_EVENTMASK(SDL_JOYBUTTONUP),
  97.         SDL_JOYEVENTMASK        = SDL_EVENTMASK(SDL_JOYAXISMOTION)|
  98.                                   SDL_EVENTMASK(SDL_JOYBALLMOTION)|
  99.                                   SDL_EVENTMASK(SDL_JOYHATMOTION)|
  100.                                   SDL_EVENTMASK(SDL_JOYBUTTONDOWN)|
  101.                                   SDL_EVENTMASK(SDL_JOYBUTTONUP),
  102.         SDL_VIDEORESIZEMASK     = SDL_EVENTMASK(SDL_VIDEORESIZE),
  103.         SDL_VIDEOEXPOSEMASK     = SDL_EVENTMASK(SDL_VIDEOEXPOSE),
  104.         SDL_QUITMASK            = SDL_EVENTMASK(SDL_QUIT),
  105.         SDL_SYSWMEVENTMASK      = SDL_EVENTMASK(SDL_SYSWMEVENT)
  106. };
  107. #define SDL_ALLEVENTS           0xFFFFFFFF
  108.  
  109. /* Application visibility event structure */
  110. typedef struct {
  111.         Uint8 type;     /* SDL_ACTIVEEVENT */
  112.         Uint8 gain;     /* Whether given states were gained or lost (1/0) */
  113.         Uint8 state;    /* A mask of the focus states */
  114. } SDL_ActiveEvent;
  115.  
  116. /* Keyboard event structure */
  117. typedef struct {
  118.         Uint8 type;     /* SDL_KEYDOWN or SDL_KEYUP */
  119.         Uint8 which;    /* The keyboard device index */
  120.         Uint8 state;    /* SDL_PRESSED or SDL_RELEASED */
  121.         SDL_keysym keysym;
  122. } SDL_KeyboardEvent;
  123.  
  124. /* Mouse motion event structure */
  125. typedef struct {
  126.         Uint8 type;     /* SDL_MOUSEMOTION */
  127.         Uint8 which;    /* The mouse device index */
  128.         Uint8 state;    /* The current button state */
  129.         Uint16 x, y;    /* The X/Y coordinates of the mouse */
  130.         Sint16 xrel;    /* The relative motion in the X direction */
  131.         Sint16 yrel;    /* The relative motion in the Y direction */
  132. } SDL_MouseMotionEvent;
  133.  
  134. /* Mouse button event structure */
  135. typedef struct {
  136.         Uint8 type;     /* SDL_MOUSEBUTTONDOWN or SDL_MOUSEBUTTONUP */
  137.         Uint8 which;    /* The mouse device index */
  138.         Uint8 button;   /* The mouse button index */
  139.         Uint8 state;    /* SDL_PRESSED or SDL_RELEASED */
  140.         Uint16 x, y;    /* The X/Y coordinates of the mouse at press time */
  141. } SDL_MouseButtonEvent;
  142.  
  143. /* Joystick axis motion event structure */
  144. typedef struct {
  145.         Uint8 type;     /* SDL_JOYAXISMOTION */
  146.         Uint8 which;    /* The joystick device index */
  147.         Uint8 axis;     /* The joystick axis index */
  148.         Sint16 value;   /* The axis value (range: -32768 to 32767) */
  149. } SDL_JoyAxisEvent;
  150.  
  151. /* Joystick trackball motion event structure */
  152. typedef struct {
  153.         Uint8 type;     /* SDL_JOYBALLMOTION */
  154.         Uint8 which;    /* The joystick device index */
  155.         Uint8 ball;     /* The joystick trackball index */
  156.         Sint16 xrel;    /* The relative motion in the X direction */
  157.         Sint16 yrel;    /* The relative motion in the Y direction */
  158. } SDL_JoyBallEvent;
  159.  
  160. /* Joystick hat position change event structure */
  161. typedef struct {
  162.         Uint8 type;     /* SDL_JOYHATMOTION */
  163.         Uint8 which;    /* The joystick device index */
  164.         Uint8 hat;      /* The joystick hat index */
  165.         Uint8 value;    /* The hat position value:
  166.                                 8   1   2
  167.                                 7   0   3
  168.                                 6   5   4
  169.                            Note that zero means the POV is centered.
  170.                         */
  171. } SDL_JoyHatEvent;
  172.  
  173. /* Joystick button event structure */
  174. typedef struct {
  175.         Uint8 type;     /* SDL_JOYBUTTONDOWN or SDL_JOYBUTTONUP */
  176.         Uint8 which;    /* The joystick device index */
  177.         Uint8 button;   /* The joystick button index */
  178.         Uint8 state;    /* SDL_PRESSED or SDL_RELEASED */
  179. } SDL_JoyButtonEvent;
  180.  
  181. /* The "window resized" event
  182.    When you get this event, you are responsible for setting a new video
  183.    mode with the new width and height.
  184.  */
  185. typedef struct {
  186.         Uint8 type;     /* SDL_VIDEORESIZE */
  187.         int w;          /* New width */
  188.         int h;          /* New height */
  189. } SDL_ResizeEvent;
  190.  
  191. /* The "screen redraw" event */
  192. typedef struct {
  193.         Uint8 type;     /* SDL_VIDEOEXPOSE */
  194. } SDL_ExposeEvent;
  195.  
  196. /* The "quit requested" event */
  197. typedef struct {
  198.         Uint8 type;     /* SDL_QUIT */
  199. } SDL_QuitEvent;
  200.  
  201. /* A user-defined event type */
  202. typedef struct {
  203.         Uint8 type;     /* SDL_USEREVENT through SDL_NUMEVENTS-1 */
  204.         int code;       /* User defined event code */
  205.         void *data1;    /* User defined data pointer */
  206.         void *data2;    /* User defined data pointer */
  207. } SDL_UserEvent;
  208.  
  209. /* If you want to use this event, you should include SDL_syswm.h */
  210. struct SDL_SysWMmsg;
  211. typedef struct SDL_SysWMmsg SDL_SysWMmsg;
  212. typedef struct {
  213.         Uint8 type;
  214.         SDL_SysWMmsg *msg;
  215. } SDL_SysWMEvent;
  216.  
  217. /* General event structure */
  218. typedef union {
  219.         Uint8 type;
  220.         SDL_ActiveEvent active;
  221.         SDL_KeyboardEvent key;
  222.         SDL_MouseMotionEvent motion;
  223.         SDL_MouseButtonEvent button;
  224.         SDL_JoyAxisEvent jaxis;
  225.         SDL_JoyBallEvent jball;
  226.         SDL_JoyHatEvent jhat;
  227.         SDL_JoyButtonEvent jbutton;
  228.         SDL_ResizeEvent resize;
  229.         SDL_ExposeEvent expose;
  230.         SDL_QuitEvent quit;
  231.         SDL_UserEvent user;
  232.         SDL_SysWMEvent syswm;
  233. } SDL_Event;
  234.  
  235.  
  236. /* Function prototypes */
  237.  
  238. /* Pumps the event loop, gathering events from the input devices.
  239.    This function updates the event queue and internal input device state.
  240.    This should only be run in the thread that sets the video mode.
  241. */
  242. extern DECLSPEC void SDL_PumpEvents(void);
  243.  
  244. /* Checks the event queue for messages and optionally returns them.
  245.    If 'action' is SDL_ADDEVENT, up to 'numevents' events will be added to
  246.    the back of the event queue.
  247.    If 'action' is SDL_PEEKEVENT, up to 'numevents' events at the front
  248.    of the event queue, matching 'mask', will be returned and will not
  249.    be removed from the queue.
  250.    If 'action' is SDL_GETEVENT, up to 'numevents' events at the front
  251.    of the event queue, matching 'mask', will be returned and will be
  252.    removed from the queue.
  253.    This function returns the number of events actually stored, or -1
  254.    if there was an error.  This function is thread-safe.
  255. */
  256. typedef enum {
  257.         SDL_ADDEVENT,
  258.         SDL_PEEKEVENT,
  259.         SDL_GETEVENT
  260. } SDL_eventaction;
  261. /* */
  262. extern DECLSPEC int SDL_PeepEvents(SDL_Event *events, int numevents,
  263.                                 SDL_eventaction action, Uint32 mask);
  264.  
  265. /* Polls for currently pending events, and returns 1 if there are any pending
  266.    events, or 0 if there are none available.  If 'event' is not NULL, the next
  267.    event is removed from the queue and stored in that area.
  268.  */
  269. extern DECLSPEC int SDL_PollEvent(SDL_Event *event);
  270.  
  271. /* Waits indefinitely for the next available event, returning 1, or 0 if there
  272.    was an error while waiting for events.  If 'event' is not NULL, the next
  273.    event is removed from the queue and stored in that area.
  274.  */
  275. extern DECLSPEC int SDL_WaitEvent(SDL_Event *event);
  276.  
  277. /* Add an event to the event queue.
  278.    This function returns 0, or -1 if the event couldn't be added to
  279.    the event queue.  If the event queue is full, this function fails.
  280.  */
  281. extern DECLSPEC int SDL_PushEvent(SDL_Event *event);
  282.  
  283. /*
  284.   This function sets up a filter to process all events before they
  285.   change internal state and are posted to the internal event queue.
  286.  
  287.   The filter is protypted as:
  288. */
  289. typedef int (*SDL_EventFilter)(const SDL_Event *event);
  290. /*
  291.   If the filter returns 1, then the event will be added to the internal queue.
  292.   If it returns 0, then the event will be dropped from the queue, but the
  293.   internal state will still be updated.  This allows selective filtering of
  294.   dynamically arriving events.
  295.  
  296.   WARNING:  Be very careful of what you do in the event filter function, as
  297.             it may run in a different thread!
  298.  
  299.   There is one caveat when dealing with the SDL_QUITEVENT event type.  The
  300.   event filter is only called when the window manager desires to close the
  301.   application window.  If the event filter returns 1, then the window will
  302.   be closed, otherwise the window will remain open if possible.
  303.   If the quit event is generated by an interrupt signal, it will bypass the
  304.   internal queue and be delivered to the application at the next event poll.
  305. */
  306. extern DECLSPEC void SDL_SetEventFilter(SDL_EventFilter filter);
  307.  
  308. /*
  309.   Return the current event filter - can be used to "chain" filters.
  310.   If there is no event filter set, this function returns NULL.
  311. */
  312. extern DECLSPEC SDL_EventFilter SDL_GetEventFilter(void);
  313.  
  314. /*
  315.   This function allows you to set the state of processing certain events.
  316.   If 'state' is set to SDL_IGNORE, that event will be automatically dropped
  317.   from the event queue and will not event be filtered.
  318.   If 'state' is set to SDL_ENABLE, that event will be processed normally.
  319.   If 'state' is set to SDL_QUERY, SDL_EventState() will return the
  320.   current processing state of the specified event.
  321. */
  322. #define SDL_QUERY       -1
  323. #define SDL_IGNORE       0
  324. #define SDL_DISABLE      0
  325. #define SDL_ENABLE       1
  326. extern DECLSPEC Uint8 SDL_EventState(Uint8 type, int state);
  327.  
  328.  
  329. /* Ends C function definitions when using C++ */
  330. #ifdef __cplusplus
  331. }
  332. #endif
  333. #include "close_code.h"
  334.  
  335. #endif /* _SDL_events_h */
  336.