include/SDL_events.h

   1 /*
   2     SDL - Simple DirectMedia Layer
   3     Copyright (C) 1997-2006 Sam Lantinga
   4
   5     This library is free software; you can redistribute it and/or
   6     modify it under the terms of the GNU Lesser General Public
   7     License as published by the Free Software Foundation; either
   8     version 2.1 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     Lesser General Public License for more details.
  14
  15     You should have received a copy of the GNU Lesser General Public
  16     License along with this library; if not, write to the Free Software
  17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18
  19     Sam Lantinga
  20     slouken@libsdl.org
  21 */
  22
  23 /* Include file for SDL event handling */
  24
  25 #ifndef _SDL_events_h
  26 #define _SDL_events_h
  27
  28 #include "SDL_stdinc.h"
  29 #include "SDL_error.h"
  30 #include "SDL_active.h"
  31 #include "SDL_keyboard.h"
  32 #include "SDL_mouse.h"
  33 #include "SDL_joystick.h"
  34 #include "SDL_quit.h"
  35
  36 #include "begin_code.h"
  37 /* Set up for C function definitions, even when using C++ */
  38 #ifdef __cplusplus
  39 extern "C" {
  40 #endif
  41
  42 /* General keyboard/mouse state definitions */
  43 #define SDL_RELEASED    0
  44 #define SDL_PRESSED     1
  45
  46 /* Event enumerations */
  47 typedef enum {
  48        SDL_NOEVENT = 0,                 /* Unused (do not remove) */
  49        SDL_ACTIVEEVENT,                 /* Application loses/gains visibility */
  50        SDL_KEYDOWN,                     /* Keys pressed */
  51        SDL_KEYUP,                       /* Keys released */
  52        SDL_MOUSEMOTION,                 /* Mouse moved */
  53        SDL_MOUSEBUTTONDOWN,             /* Mouse button pressed */
  54        SDL_MOUSEBUTTONUP,               /* Mouse button released */
  55        SDL_JOYAXISMOTION,               /* Joystick axis motion */
  56        SDL_JOYBALLMOTION,               /* Joystick trackball motion */
  57        SDL_JOYHATMOTION,                /* Joystick hat position change */
  58        SDL_JOYBUTTONDOWN,               /* Joystick button pressed */
  59        SDL_JOYBUTTONUP,                 /* Joystick button released */
  60        SDL_QUIT,                        /* User-requested quit */
  61        SDL_SYSWMEVENT,                  /* System specific event */
  62        SDL_EVENT_RESERVEDA,             /* Reserved for future use.. */
  63        SDL_EVENT_RESERVEDB,             /* Reserved for future use.. */
  64        SDL_VIDEORESIZE,                 /* User resized video mode */
  65        SDL_VIDEOEXPOSE,                 /* Screen needs to be redrawn */
  66        SDL_EVENT_RESERVED2,             /* Reserved for future use.. */
  67        SDL_EVENT_RESERVED3,             /* Reserved for future use.. */
  68        SDL_EVENT_RESERVED4,             /* Reserved for future use.. */
  69        SDL_EVENT_RESERVED5,             /* Reserved for future use.. */
  70        SDL_EVENT_RESERVED6,             /* Reserved for future use.. */
  71        SDL_EVENT_RESERVED7,             /* Reserved for future use.. */
  72        /* Events SDL_USEREVENT through SDL_MAXEVENTS-1 are for your use */
  73        SDL_USEREVENT = 24,
  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 } SDL_EventType;
  79
  80 /* Predefined event masks */
  81 #define SDL_EVENTMASK(X)        (1<<(X))
  82 typedef enum {
  83         SDL_ACTIVEEVENTMASK     = SDL_EVENTMASK(SDL_ACTIVEEVENT),
  84         SDL_KEYDOWNMASK         = SDL_EVENTMASK(SDL_KEYDOWN),
  85         SDL_KEYUPMASK           = SDL_EVENTMASK(SDL_KEYUP),
  86         SDL_KEYEVENTMASK        = SDL_EVENTMASK(SDL_KEYDOWN)|
  87                                   SDL_EVENTMASK(SDL_KEYUP),
  88         SDL_MOUSEMOTIONMASK     = SDL_EVENTMASK(SDL_MOUSEMOTION),
  89         SDL_MOUSEBUTTONDOWNMASK = SDL_EVENTMASK(SDL_MOUSEBUTTONDOWN),
  90         SDL_MOUSEBUTTONUPMASK   = SDL_EVENTMASK(SDL_MOUSEBUTTONUP),
  91         SDL_MOUSEEVENTMASK      = SDL_EVENTMASK(SDL_MOUSEMOTION)|
  92                                   SDL_EVENTMASK(SDL_MOUSEBUTTONDOWN)|
  93                                   SDL_EVENTMASK(SDL_MOUSEBUTTONUP),
  94         SDL_JOYAXISMOTIONMASK   = SDL_EVENTMASK(SDL_JOYAXISMOTION),
  95         SDL_JOYBALLMOTIONMASK   = SDL_EVENTMASK(SDL_JOYBALLMOTION),
  96         SDL_JOYHATMOTIONMASK    = SDL_EVENTMASK(SDL_JOYHATMOTION),
  97         SDL_JOYBUTTONDOWNMASK   = SDL_EVENTMASK(SDL_JOYBUTTONDOWN),
  98         SDL_JOYBUTTONUPMASK     = SDL_EVENTMASK(SDL_JOYBUTTONUP),
  99         SDL_JOYEVENTMASK        = SDL_EVENTMASK(SDL_JOYAXISMOTION)|
 100                                   SDL_EVENTMASK(SDL_JOYBALLMOTION)|
 101                                   SDL_EVENTMASK(SDL_JOYHATMOTION)|
 102                                   SDL_EVENTMASK(SDL_JOYBUTTONDOWN)|
 103                                   SDL_EVENTMASK(SDL_JOYBUTTONUP),
 104         SDL_VIDEORESIZEMASK     = SDL_EVENTMASK(SDL_VIDEORESIZE),
 105         SDL_VIDEOEXPOSEMASK     = SDL_EVENTMASK(SDL_VIDEOEXPOSE),
 106         SDL_QUITMASK            = SDL_EVENTMASK(SDL_QUIT),
 107         SDL_SYSWMEVENTMASK      = SDL_EVENTMASK(SDL_SYSWMEVENT)
 108 } SDL_EventMask ;
 109 #define SDL_ALLEVENTS           0xFFFFFFFF
 110
 111 /* Application visibility event structure */
 112 typedef struct SDL_ActiveEvent {
 113         Uint8 type;     /* SDL_ACTIVEEVENT */
 114         Uint8 gain;     /* Whether given states were gained or lost (1/0) */
 115         Uint8 state;    /* A mask of the focus states */
 116 } SDL_ActiveEvent;
 117
 118 /* Keyboard event structure */
 119 typedef struct SDL_KeyboardEvent {
 120         Uint8 type;     /* SDL_KEYDOWN or SDL_KEYUP */
 121         Uint8 which;    /* The keyboard device index */
 122         Uint8 state;    /* SDL_PRESSED or SDL_RELEASED */
 123         SDL_keysym keysym;
 124 } SDL_KeyboardEvent;
 125
 126 /* Mouse motion event structure */
 127 typedef struct SDL_MouseMotionEvent {
 128         Uint8 type;     /* SDL_MOUSEMOTION */
 129         Uint8 which;    /* The mouse device index */
 130         Uint8 state;    /* The current button state */
 131         Uint16 x, y;    /* The X/Y coordinates of the mouse */
 132         Sint16 xrel;    /* The relative motion in the X direction */
 133         Sint16 yrel;    /* The relative motion in the Y direction */
 134 } SDL_MouseMotionEvent;
 135
 136 /* Mouse button event structure */
 137 typedef struct SDL_MouseButtonEvent {
 138         Uint8 type;     /* SDL_MOUSEBUTTONDOWN or SDL_MOUSEBUTTONUP */
 139         Uint8 which;    /* The mouse device index */
 140         Uint8 button;   /* The mouse button index */
 141         Uint8 state;    /* SDL_PRESSED or SDL_RELEASED */
 142         Uint16 x, y;    /* The X/Y coordinates of the mouse at press time */
 143 } SDL_MouseButtonEvent;
 144
 145 /* Joystick axis motion event structure */
 146 typedef struct SDL_JoyAxisEvent {
 147         Uint8 type;     /* SDL_JOYAXISMOTION */
 148         Uint8 which;    /* The joystick device index */
 149         Uint8 axis;     /* The joystick axis index */
 150         Sint16 value;   /* The axis value (range: -32768 to 32767) */
 151 } SDL_JoyAxisEvent;
 152
 153 /* Joystick trackball motion event structure */
 154 typedef struct SDL_JoyBallEvent {
 155         Uint8 type;     /* SDL_JOYBALLMOTION */
 156         Uint8 which;    /* The joystick device index */
 157         Uint8 ball;     /* The joystick trackball index */
 158         Sint16 xrel;    /* The relative motion in the X direction */
 159         Sint16 yrel;    /* The relative motion in the Y direction */
 160 } SDL_JoyBallEvent;
 161
 162 /* Joystick hat position change event structure */
 163 typedef struct SDL_JoyHatEvent {
 164         Uint8 type;     /* SDL_JOYHATMOTION */
 165         Uint8 which;    /* The joystick device index */
 166         Uint8 hat;      /* The joystick hat index */
 167         Uint8 value;    /* The hat position value:
 168                             SDL_HAT_LEFTUP   SDL_HAT_UP       SDL_HAT_RIGHTUP
 169                             SDL_HAT_LEFT     SDL_HAT_CENTERED SDL_HAT_RIGHT
 170                             SDL_HAT_LEFTDOWN SDL_HAT_DOWN     SDL_HAT_RIGHTDOWN
 171                            Note that zero means the POV is centered.
 172                         */
 173 } SDL_JoyHatEvent;
 174
 175 /* Joystick button event structure */
 176 typedef struct SDL_JoyButtonEvent {
 177         Uint8 type;     /* SDL_JOYBUTTONDOWN or SDL_JOYBUTTONUP */
 178         Uint8 which;    /* The joystick device index */
 179         Uint8 button;   /* The joystick button index */
 180         Uint8 state;    /* SDL_PRESSED or SDL_RELEASED */
 181 } SDL_JoyButtonEvent;
 182
 183 /* The "window resized" event
 184    When you get this event, you are responsible for setting a new video
 185    mode with the new width and height.
 186  */
 187 typedef struct SDL_ResizeEvent {
 188         Uint8 type;     /* SDL_VIDEORESIZE */
 189         int w;          /* New width */
 190         int h;          /* New height */
 191 } SDL_ResizeEvent;
 192
 193 /* The "screen redraw" event */
 194 typedef struct SDL_ExposeEvent {
 195         Uint8 type;     /* SDL_VIDEOEXPOSE */
 196 } SDL_ExposeEvent;
 197
 198 /* The "quit requested" event */
 199 typedef struct SDL_QuitEvent {
 200         Uint8 type;     /* SDL_QUIT */
 201 } SDL_QuitEvent;
 202
 203 /* A user-defined event type */
 204 typedef struct SDL_UserEvent {
 205         Uint8 type;     /* SDL_USEREVENT through SDL_NUMEVENTS-1 */
 206         int code;       /* User defined event code */
 207         void *data1;    /* User defined data pointer */
 208         void *data2;    /* User defined data pointer */
 209 } SDL_UserEvent;
 210
 211 /* If you want to use this event, you should include SDL_syswm.h */
 212 struct SDL_SysWMmsg;
 213 typedef struct SDL_SysWMmsg SDL_SysWMmsg;
 214 typedef struct SDL_SysWMEvent {
 215         Uint8 type;
 216         SDL_SysWMmsg *msg;
 217 } SDL_SysWMEvent;
 218
 219 /* General event structure */
 220 typedef union SDL_Event {
 221         Uint8 type;
 222         SDL_ActiveEvent active;
 223         SDL_KeyboardEvent key;
 224         SDL_MouseMotionEvent motion;
 225         SDL_MouseButtonEvent button;
 226         SDL_JoyAxisEvent jaxis;
 227         SDL_JoyBallEvent jball;
 228         SDL_JoyHatEvent jhat;
 229         SDL_JoyButtonEvent jbutton;
 230         SDL_ResizeEvent resize;
 231         SDL_ExposeEvent expose;
 232         SDL_QuitEvent quit;
 233         SDL_UserEvent user;
 234         SDL_SysWMEvent syswm;
 235 } SDL_Event;
 236
 237
 238 /* Function prototypes */
 239
 240 /* Pumps the event loop, gathering events from the input devices.
 241    This function updates the event queue and internal input device state.
 242    This should only be run in the thread that sets the video mode.
 243 */
 244 extern DECLSPEC void SDLCALL SDL_PumpEvents(void);
 245
 246 /* Checks the event queue for messages and optionally returns them.
 247    If 'action' is SDL_ADDEVENT, up to 'numevents' events will be added to
 248    the back of the event queue.
 249    If 'action' is SDL_PEEKEVENT, up to 'numevents' events at the front
 250    of the event queue, matching 'mask', will be returned and will not
 251    be removed from the queue.
 252    If 'action' is SDL_GETEVENT, up to 'numevents' events at the front
 253    of the event queue, matching 'mask', will be returned and will be
 254    removed from the queue.
 255    This function returns the number of events actually stored, or -1
 256    if there was an error.  This function is thread-safe.
 257 */
 258 typedef enum {
 259         SDL_ADDEVENT,
 260         SDL_PEEKEVENT,
 261         SDL_GETEVENT
 262 } SDL_eventaction;
 263 /* */
 264 extern DECLSPEC int SDLCALL SDL_PeepEvents(SDL_Event *events, int numevents,
 265                                 SDL_eventaction action, Uint32 mask);
 266
 267 /* Polls for currently pending events, and returns 1 if there are any pending
 268    events, or 0 if there are none available.  If 'event' is not NULL, the next
 269    event is removed from the queue and stored in that area.
 270  */
 271 extern DECLSPEC int SDLCALL SDL_PollEvent(SDL_Event *event);
 272
 273 /* Waits indefinitely for the next available event, returning 1, or 0 if there
 274    was an error while waiting for events.  If 'event' is not NULL, the next
 275    event is removed from the queue and stored in that area.
 276  */
 277 extern DECLSPEC int SDLCALL SDL_WaitEvent(SDL_Event *event);
 278
 279 /* Add an event to the event queue.
 280    This function returns 0 on success, or -1 if the event queue was full
 281    or there was some other error.
 282  */
 283 extern DECLSPEC int SDLCALL SDL_PushEvent(SDL_Event *event);
 284
 285 /*
 286   This function sets up a filter to process all events before they
 287   change internal state and are posted to the internal event queue.
 288
 289   The filter is protypted as:
 290 */
 291 typedef int (SDLCALL *SDL_EventFilter)(const SDL_Event *event);
 292 /*
 293   If the filter returns 1, then the event will be added to the internal queue.
 294   If it returns 0, then the event will be dropped from the queue, but the
 295   internal state will still be updated.  This allows selective filtering of
 296   dynamically arriving events.
 297
 298   WARNING:  Be very careful of what you do in the event filter function, as
 299             it may run in a different thread!
 300
 301   There is one caveat when dealing with the SDL_QUITEVENT event type.  The
 302   event filter is only called when the window manager desires to close the
 303   application window.  If the event filter returns 1, then the window will
 304   be closed, otherwise the window will remain open if possible.
 305   If the quit event is generated by an interrupt signal, it will bypass the
 306   internal queue and be delivered to the application at the next event poll.
 307 */
 308 extern DECLSPEC void SDLCALL SDL_SetEventFilter(SDL_EventFilter filter);
 309
 310 /*
 311   Return the current event filter - can be used to "chain" filters.
 312   If there is no event filter set, this function returns NULL.
 313 */
 314 extern DECLSPEC SDL_EventFilter SDLCALL SDL_GetEventFilter(void);
 315
 316 /*
 317   This function allows you to set the state of processing certain events.
 318   If 'state' is set to SDL_IGNORE, that event will be automatically dropped
 319   from the event queue and will not event be filtered.
 320   If 'state' is set to SDL_ENABLE, that event will be processed normally.
 321   If 'state' is set to SDL_QUERY, SDL_EventState() will return the
 322   current processing state of the specified event.
 323 */
 324 #define SDL_QUERY       -1
 325 #define SDL_IGNORE       0
 326 #define SDL_DISABLE      0
 327 #define SDL_ENABLE       1
 328 extern DECLSPEC Uint8 SDLCALL SDL_EventState(Uint8 type, int state);
 329
 330
 331 /* Ends C function definitions when using C++ */
 332 #ifdef __cplusplus
 333 }
 334 #endif
 335 #include "close_code.h"
 336
 337 #endif /* _SDL_events_h */