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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 */
338