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SDL_events.c
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/*
Simple DirectMedia Layer
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Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../SDL_internal.h"
/* General event handling code for SDL */
#include "SDL.h"
#include "SDL_events.h"
#include "SDL_thread.h"
#include "SDL_events_c.h"
#include "../timer/SDL_timer_c.h"
#if !SDL_JOYSTICK_DISABLED
#include "../joystick/SDL_joystick_c.h"
#endif
#include "../video/SDL_sysvideo.h"
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#include "SDL_syswm.h"
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#undef SDL_PRIs64
#ifdef __WIN32__
#define SDL_PRIs64 "I64d"
#else
#define SDL_PRIs64 "lld"
#endif
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/* An arbitrary limit so we don't have unbounded growth */
#define SDL_MAX_QUEUED_EVENTS 65535
typedef struct SDL_EventWatcher {
SDL_EventFilter callback;
void *userdata;
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SDL_bool removed;
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} SDL_EventWatcher;
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static SDL_mutex *SDL_event_watchers_lock;
static SDL_EventWatcher SDL_EventOK;
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static SDL_EventWatcher *SDL_event_watchers = NULL;
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static int SDL_event_watchers_count = 0;
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static SDL_bool SDL_event_watchers_dispatching = SDL_FALSE;
static SDL_bool SDL_event_watchers_removed = SDL_FALSE;
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typedef struct {
Uint32 bits[8];
} SDL_DisabledEventBlock;
static SDL_DisabledEventBlock *SDL_disabled_events[256];
static Uint32 SDL_userevents = SDL_USEREVENT;
/* Private data -- event queue */
typedef struct _SDL_EventEntry
{
SDL_Event event;
SDL_SysWMmsg msg;
struct _SDL_EventEntry *prev;
struct _SDL_EventEntry *next;
} SDL_EventEntry;
typedef struct _SDL_SysWMEntry
{
SDL_SysWMmsg msg;
struct _SDL_SysWMEntry *next;
} SDL_SysWMEntry;
static struct
{
SDL_mutex *lock;
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SDL_atomic_t active;
SDL_atomic_t count;
int max_events_seen;
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SDL_EventEntry *head;
SDL_EventEntry *tail;
SDL_EventEntry *free;
SDL_SysWMEntry *wmmsg_used;
SDL_SysWMEntry *wmmsg_free;
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} SDL_EventQ = { NULL, { 1 }, { 0 }, 0, NULL, NULL, NULL, NULL, NULL };
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/* 0 (default) means no logging, 1 means logging, 2 means logging with mouse and finger motion */
static int SDL_DoEventLogging = 0;
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static void SDLCALL
SDL_EventLoggingChanged(void *userdata, const char *name, const char *oldValue, const char *hint)
{
SDL_DoEventLogging = (hint && *hint) ? SDL_max(SDL_min(SDL_atoi(hint), 2), 0) : 0;
}
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static void
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SDL_LogEvent(const SDL_Event *event)
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{
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char name[32];
char details[128];
/* mouse/finger motion are spammy, ignore these if they aren't demanded. */
if ( (SDL_DoEventLogging < 2) &&
( (event->type == SDL_MOUSEMOTION) ||
(event->type == SDL_FINGERMOTION) ) ) {
return;
}
/* this is to make SDL_snprintf() calls cleaner. */
#define uint unsigned int
name[0] = '\0';
details[0] = '\0';
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/* !!! FIXME: This code is kinda ugly, sorry. */
if ((event->type >= SDL_USEREVENT) && (event->type <= SDL_LASTEVENT)) {
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char plusstr[16];
SDL_strlcpy(name, "SDL_USEREVENT", sizeof (name));
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if (event->type > SDL_USEREVENT) {
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SDL_snprintf(plusstr, sizeof (plusstr), "+%u", ((uint) event->type) - SDL_USEREVENT);
} else {
plusstr[0] = '\0';
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}
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SDL_snprintf(details, sizeof (details), "%s (timestamp=%u windowid=%u code=%d data1=%p data2=%p)",
plusstr, (uint) event->user.timestamp, (uint) event->user.windowID,
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(int) event->user.code, event->user.data1, event->user.data2);
}
switch (event->type) {
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#define SDL_EVENT_CASE(x) case x: SDL_strlcpy(name, #x, sizeof (name));
SDL_EVENT_CASE(SDL_FIRSTEVENT) SDL_strlcpy(details, " (THIS IS PROBABLY A BUG!)", sizeof (details)); break;
SDL_EVENT_CASE(SDL_QUIT) SDL_snprintf(details, sizeof (details), " (timestamp=%u)", (uint) event->quit.timestamp); break;
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SDL_EVENT_CASE(SDL_APP_TERMINATING) break;
SDL_EVENT_CASE(SDL_APP_LOWMEMORY) break;
SDL_EVENT_CASE(SDL_APP_WILLENTERBACKGROUND) break;
SDL_EVENT_CASE(SDL_APP_DIDENTERBACKGROUND) break;
SDL_EVENT_CASE(SDL_APP_WILLENTERFOREGROUND) break;
SDL_EVENT_CASE(SDL_APP_DIDENTERFOREGROUND) break;
SDL_EVENT_CASE(SDL_KEYMAPCHANGED) break;
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SDL_EVENT_CASE(SDL_CLIPBOARDUPDATE) break;
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SDL_EVENT_CASE(SDL_RENDER_TARGETS_RESET) break;
SDL_EVENT_CASE(SDL_RENDER_DEVICE_RESET) break;
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SDL_EVENT_CASE(SDL_WINDOWEVENT) {
char name2[64];
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switch(event->window.event) {
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case SDL_WINDOWEVENT_NONE: SDL_strlcpy(name2, "SDL_WINDOWEVENT_NONE (THIS IS PROBABLY A BUG!)", sizeof (name2)); break;
#define SDL_WINDOWEVENT_CASE(x) case x: SDL_strlcpy(name2, #x, sizeof (name2)); break
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SDL_WINDOWEVENT_CASE(SDL_WINDOWEVENT_SHOWN);
SDL_WINDOWEVENT_CASE(SDL_WINDOWEVENT_HIDDEN);
SDL_WINDOWEVENT_CASE(SDL_WINDOWEVENT_EXPOSED);
SDL_WINDOWEVENT_CASE(SDL_WINDOWEVENT_MOVED);
SDL_WINDOWEVENT_CASE(SDL_WINDOWEVENT_RESIZED);
SDL_WINDOWEVENT_CASE(SDL_WINDOWEVENT_SIZE_CHANGED);
SDL_WINDOWEVENT_CASE(SDL_WINDOWEVENT_MINIMIZED);
SDL_WINDOWEVENT_CASE(SDL_WINDOWEVENT_MAXIMIZED);
SDL_WINDOWEVENT_CASE(SDL_WINDOWEVENT_RESTORED);
SDL_WINDOWEVENT_CASE(SDL_WINDOWEVENT_ENTER);
SDL_WINDOWEVENT_CASE(SDL_WINDOWEVENT_LEAVE);
SDL_WINDOWEVENT_CASE(SDL_WINDOWEVENT_FOCUS_GAINED);
SDL_WINDOWEVENT_CASE(SDL_WINDOWEVENT_FOCUS_LOST);
SDL_WINDOWEVENT_CASE(SDL_WINDOWEVENT_CLOSE);
SDL_WINDOWEVENT_CASE(SDL_WINDOWEVENT_TAKE_FOCUS);
SDL_WINDOWEVENT_CASE(SDL_WINDOWEVENT_HIT_TEST);
#undef SDL_WINDOWEVENT_CASE
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default: SDL_strlcpy(name2, "UNKNOWN (bug? fixme?)", sizeof (name2)); break;
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}
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SDL_snprintf(details, sizeof (details), " (timestamp=%u windowid=%u event=%s data1=%d data2=%d)",
(uint) event->window.timestamp, (uint) event->window.windowID, name2, (int) event->window.data1, (int) event->window.data2);
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break;
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}
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SDL_EVENT_CASE(SDL_SYSWMEVENT)
/* !!! FIXME: we don't delve further at the moment. */
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SDL_snprintf(details, sizeof (details), " (timestamp=%u)", (uint) event->syswm.timestamp);
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break;
#define PRINT_KEY_EVENT(event) \
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SDL_snprintf(details, sizeof (details), " (timestamp=%u windowid=%u state=%s repeat=%s scancode=%u keycode=%u mod=%u)", \
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(uint) event->key.timestamp, (uint) event->key.windowID, \
event->key.state == SDL_PRESSED ? "pressed" : "released", \
event->key.repeat ? "true" : "false", \
(uint) event->key.keysym.scancode, \
(uint) event->key.keysym.sym, \
(uint) event->key.keysym.mod)
SDL_EVENT_CASE(SDL_KEYDOWN) PRINT_KEY_EVENT(event); break;
SDL_EVENT_CASE(SDL_KEYUP) PRINT_KEY_EVENT(event); break;
#undef PRINT_KEY_EVENT
SDL_EVENT_CASE(SDL_TEXTEDITING)
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SDL_snprintf(details, sizeof (details), " (timestamp=%u windowid=%u text='%s' start=%d length=%d)",
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(uint) event->edit.timestamp, (uint) event->edit.windowID,
event->edit.text, (int) event->edit.start, (int) event->edit.length);
break;
SDL_EVENT_CASE(SDL_TEXTINPUT)
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SDL_snprintf(details, sizeof (details), " (timestamp=%u windowid=%u text='%s')", (uint) event->text.timestamp, (uint) event->text.windowID, event->text.text);
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break;
SDL_EVENT_CASE(SDL_MOUSEMOTION)
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SDL_snprintf(details, sizeof (details), " (timestamp=%u windowid=%u which=%u state=%u x=%d y=%d xrel=%d yrel=%d)",
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(uint) event->motion.timestamp, (uint) event->motion.windowID,
(uint) event->motion.which, (uint) event->motion.state,
(int) event->motion.x, (int) event->motion.y,
(int) event->motion.xrel, (int) event->motion.yrel);
break;
#define PRINT_MBUTTON_EVENT(event) \
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SDL_snprintf(details, sizeof (details), " (timestamp=%u windowid=%u which=%u button=%u state=%s clicks=%u x=%d y=%d)", \
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(uint) event->button.timestamp, (uint) event->button.windowID, \
(uint) event->button.which, (uint) event->button.button, \
event->button.state == SDL_PRESSED ? "pressed" : "released", \
(uint) event->button.clicks, (int) event->button.x, (int) event->button.y)
SDL_EVENT_CASE(SDL_MOUSEBUTTONDOWN) PRINT_MBUTTON_EVENT(event); break;
SDL_EVENT_CASE(SDL_MOUSEBUTTONUP) PRINT_MBUTTON_EVENT(event); break;
#undef PRINT_MBUTTON_EVENT
SDL_EVENT_CASE(SDL_MOUSEWHEEL)
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SDL_snprintf(details, sizeof (details), " (timestamp=%u windowid=%u which=%u x=%d y=%d direction=%s)",
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(uint) event->wheel.timestamp, (uint) event->wheel.windowID,
(uint) event->wheel.which, (int) event->wheel.x, (int) event->wheel.y,
event->wheel.direction == SDL_MOUSEWHEEL_NORMAL ? "normal" : "flipped");
break;
SDL_EVENT_CASE(SDL_JOYAXISMOTION)
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SDL_snprintf(details, sizeof (details), " (timestamp=%u which=%d axis=%u value=%d)",
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(uint) event->jaxis.timestamp, (int) event->jaxis.which,
(uint) event->jaxis.axis, (int) event->jaxis.value);
break;
SDL_EVENT_CASE(SDL_JOYBALLMOTION)
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SDL_snprintf(details, sizeof (details), " (timestamp=%u which=%d ball=%u xrel=%d yrel=%d)",
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(uint) event->jball.timestamp, (int) event->jball.which,
(uint) event->jball.ball, (int) event->jball.xrel, (int) event->jball.yrel);
break;
SDL_EVENT_CASE(SDL_JOYHATMOTION)
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SDL_snprintf(details, sizeof (details), " (timestamp=%u which=%d hat=%u value=%u)",
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(uint) event->jhat.timestamp, (int) event->jhat.which,
(uint) event->jhat.hat, (uint) event->jhat.value);
break;
#define PRINT_JBUTTON_EVENT(event) \
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SDL_snprintf(details, sizeof (details), " (timestamp=%u which=%d button=%u state=%s)", \
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(uint) event->jbutton.timestamp, (int) event->jbutton.which, \
(uint) event->jbutton.button, event->jbutton.state == SDL_PRESSED ? "pressed" : "released")
SDL_EVENT_CASE(SDL_JOYBUTTONDOWN) PRINT_JBUTTON_EVENT(event); break;
SDL_EVENT_CASE(SDL_JOYBUTTONUP) PRINT_JBUTTON_EVENT(event); break;
#undef PRINT_JBUTTON_EVENT
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#define PRINT_JOYDEV_EVENT(event) SDL_snprintf(details, sizeof (details), " (timestamp=%u which=%d)", (uint) event->jdevice.timestamp, (int) event->jdevice.which)
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SDL_EVENT_CASE(SDL_JOYDEVICEADDED) PRINT_JOYDEV_EVENT(event); break;
SDL_EVENT_CASE(SDL_JOYDEVICEREMOVED) PRINT_JOYDEV_EVENT(event); break;
#undef PRINT_JOYDEV_EVENT
SDL_EVENT_CASE(SDL_CONTROLLERAXISMOTION)
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SDL_snprintf(details, sizeof (details), " (timestamp=%u which=%d axis=%u value=%d)",
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(uint) event->caxis.timestamp, (int) event->caxis.which,
(uint) event->caxis.axis, (int) event->caxis.value);
break;
#define PRINT_CBUTTON_EVENT(event) \
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SDL_snprintf(details, sizeof (details), " (timestamp=%u which=%d button=%u state=%s)", \
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(uint) event->cbutton.timestamp, (int) event->cbutton.which, \
(uint) event->cbutton.button, event->cbutton.state == SDL_PRESSED ? "pressed" : "released")
SDL_EVENT_CASE(SDL_CONTROLLERBUTTONDOWN) PRINT_CBUTTON_EVENT(event); break;
SDL_EVENT_CASE(SDL_CONTROLLERBUTTONUP) PRINT_CBUTTON_EVENT(event); break;
#undef PRINT_CBUTTON_EVENT
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#define PRINT_CONTROLLERDEV_EVENT(event) SDL_snprintf(details, sizeof (details), " (timestamp=%u which=%d)", (uint) event->cdevice.timestamp, (int) event->cdevice.which)
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SDL_EVENT_CASE(SDL_CONTROLLERDEVICEADDED) PRINT_CONTROLLERDEV_EVENT(event); break;
SDL_EVENT_CASE(SDL_CONTROLLERDEVICEREMOVED) PRINT_CONTROLLERDEV_EVENT(event); break;
SDL_EVENT_CASE(SDL_CONTROLLERDEVICEREMAPPED) PRINT_CONTROLLERDEV_EVENT(event); break;
#undef PRINT_CONTROLLERDEV_EVENT
#define PRINT_FINGER_EVENT(event) \
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SDL_snprintf(details, sizeof (details), " (timestamp=%u touchid=%"SDL_PRIs64" fingerid=%"SDL_PRIs64" x=%f y=%f dx=%f dy=%f pressure=%f)", \
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(uint) event->tfinger.timestamp, (long long)event->tfinger.touchId, \
(long long)event->tfinger.fingerId, event->tfinger.x, event->tfinger.y, \
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event->tfinger.dx, event->tfinger.dy, event->tfinger.pressure)
SDL_EVENT_CASE(SDL_FINGERDOWN) PRINT_FINGER_EVENT(event); break;
SDL_EVENT_CASE(SDL_FINGERUP) PRINT_FINGER_EVENT(event); break;
SDL_EVENT_CASE(SDL_FINGERMOTION) PRINT_FINGER_EVENT(event); break;
#undef PRINT_FINGER_EVENT
#define PRINT_DOLLAR_EVENT(event) \
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SDL_snprintf(details, sizeof (details), " (timestamp=%u touchid=%"SDL_PRIs64" gestureid=%"SDL_PRIs64" numfingers=%u error=%f x=%f y=%f)", \
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(uint) event->dgesture.timestamp, (long long)event->dgesture.touchId, \
(long long)event->dgesture.gestureId, (uint) event->dgesture.numFingers, \
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event->dgesture.error, event->dgesture.x, event->dgesture.y);
SDL_EVENT_CASE(SDL_DOLLARGESTURE) PRINT_DOLLAR_EVENT(event); break;
SDL_EVENT_CASE(SDL_DOLLARRECORD) PRINT_DOLLAR_EVENT(event); break;
#undef PRINT_DOLLAR_EVENT
SDL_EVENT_CASE(SDL_MULTIGESTURE)
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SDL_snprintf(details, sizeof (details), " (timestamp=%u touchid=%"SDL_PRIs64" dtheta=%f ddist=%f x=%f y=%f numfingers=%u)",
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(uint) event->mgesture.timestamp, (long long)event->mgesture.touchId,
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event->mgesture.dTheta, event->mgesture.dDist,
event->mgesture.x, event->mgesture.y, (uint) event->mgesture.numFingers);
break;
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#define PRINT_DROP_EVENT(event) SDL_snprintf(details, sizeof (details), " (file='%s' timestamp=%u windowid=%u)", event->drop.file, (uint) event->drop.timestamp, (uint) event->drop.windowID)
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SDL_EVENT_CASE(SDL_DROPFILE) PRINT_DROP_EVENT(event); break;
SDL_EVENT_CASE(SDL_DROPTEXT) PRINT_DROP_EVENT(event); break;
SDL_EVENT_CASE(SDL_DROPBEGIN) PRINT_DROP_EVENT(event); break;
SDL_EVENT_CASE(SDL_DROPCOMPLETE) PRINT_DROP_EVENT(event); break;
#undef PRINT_DROP_EVENT
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#define PRINT_AUDIODEV_EVENT(event) SDL_snprintf(details, sizeof (details), " (timestamp=%u which=%u iscapture=%s)", (uint) event->adevice.timestamp, (uint) event->adevice.which, event->adevice.iscapture ? "true" : "false");
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SDL_EVENT_CASE(SDL_AUDIODEVICEADDED) PRINT_AUDIODEV_EVENT(event); break;
SDL_EVENT_CASE(SDL_AUDIODEVICEREMOVED) PRINT_AUDIODEV_EVENT(event); break;
#undef PRINT_AUDIODEV_EVENT
#undef SDL_EVENT_CASE
default:
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if (!name[0]) {
SDL_strlcpy(name, "UNKNOWN", sizeof (name));
SDL_snprintf(details, sizeof (details), " #%u! (Bug? FIXME?)", (uint) event->type);
}
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break;
}
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if (name[0]) {
SDL_Log("SDL EVENT: %s%s", name, details);
}
#undef uint
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}
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/* Public functions */
void
SDL_StopEventLoop(void)
{
const char *report = SDL_GetHint("SDL_EVENT_QUEUE_STATISTICS");
int i;
SDL_EventEntry *entry;
SDL_SysWMEntry *wmmsg;
if (SDL_EventQ.lock) {
SDL_LockMutex(SDL_EventQ.lock);
}
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SDL_AtomicSet(&SDL_EventQ.active, 0);
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if (report && SDL_atoi(report)) {
SDL_Log("SDL EVENT QUEUE: Maximum events in-flight: %d\n",
SDL_EventQ.max_events_seen);
}
/* Clean out EventQ */
for (entry = SDL_EventQ.head; entry; ) {
SDL_EventEntry *next = entry->next;
SDL_free(entry);
entry = next;
}
for (entry = SDL_EventQ.free; entry; ) {
SDL_EventEntry *next = entry->next;
SDL_free(entry);
entry = next;
}
for (wmmsg = SDL_EventQ.wmmsg_used; wmmsg; ) {
SDL_SysWMEntry *next = wmmsg->next;
SDL_free(wmmsg);
wmmsg = next;
}
for (wmmsg = SDL_EventQ.wmmsg_free; wmmsg; ) {
SDL_SysWMEntry *next = wmmsg->next;
SDL_free(wmmsg);
wmmsg = next;
}
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SDL_AtomicSet(&SDL_EventQ.count, 0);
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SDL_EventQ.max_events_seen = 0;
SDL_EventQ.head = NULL;
SDL_EventQ.tail = NULL;
SDL_EventQ.free = NULL;
SDL_EventQ.wmmsg_used = NULL;
SDL_EventQ.wmmsg_free = NULL;
/* Clear disabled event state */
for (i = 0; i < SDL_arraysize(SDL_disabled_events); ++i) {
SDL_free(SDL_disabled_events[i]);
SDL_disabled_events[i] = NULL;
}
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if (SDL_event_watchers_lock) {
SDL_DestroyMutex(SDL_event_watchers_lock);
SDL_event_watchers_lock = NULL;
}
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if (SDL_event_watchers) {
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SDL_free(SDL_event_watchers);
SDL_event_watchers = NULL;
SDL_event_watchers_count = 0;
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}
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SDL_zero(SDL_EventOK);
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if (SDL_EventQ.lock) {
SDL_UnlockMutex(SDL_EventQ.lock);
SDL_DestroyMutex(SDL_EventQ.lock);
SDL_EventQ.lock = NULL;
}
}
/* This function (and associated calls) may be called more than once */
int
SDL_StartEventLoop(void)
{
/* We'll leave the event queue alone, since we might have gotten
some important events at launch (like SDL_DROPFILE)
FIXME: Does this introduce any other bugs with events at startup?
*/
/* Create the lock and set ourselves active */
#if !SDL_THREADS_DISABLED
if (!SDL_EventQ.lock) {
SDL_EventQ.lock = SDL_CreateMutex();
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if (SDL_EventQ.lock == NULL) {
return -1;
}
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}
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if (!SDL_event_watchers_lock) {
SDL_event_watchers_lock = SDL_CreateMutex();
if (SDL_event_watchers_lock == NULL) {
return -1;
}
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}
#endif /* !SDL_THREADS_DISABLED */
/* Process most event types */
SDL_EventState(SDL_TEXTINPUT, SDL_DISABLE);
SDL_EventState(SDL_TEXTEDITING, SDL_DISABLE);
SDL_EventState(SDL_SYSWMEVENT, SDL_DISABLE);
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#if 0 /* Leave these events enabled so apps can respond to items being dragged onto them at startup */
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SDL_EventState(SDL_DROPFILE, SDL_DISABLE);
SDL_EventState(SDL_DROPTEXT, SDL_DISABLE);
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#endif
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SDL_AtomicSet(&SDL_EventQ.active, 1);
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return 0;
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}
/* Add an event to the event queue -- called with the queue locked */
static int
SDL_AddEvent(SDL_Event * event)
{
SDL_EventEntry *entry;
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const int initial_count = SDL_AtomicGet(&SDL_EventQ.count);
int final_count;
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if (initial_count >= SDL_MAX_QUEUED_EVENTS) {
SDL_SetError("Event queue is full (%d events)", initial_count);
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return 0;
}
if (SDL_EventQ.free == NULL) {
entry = (SDL_EventEntry *)SDL_malloc(sizeof(*entry));
if (!entry) {
return 0;
}
} else {
entry = SDL_EventQ.free;
SDL_EventQ.free = entry->next;
}
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if (SDL_DoEventLogging) {
SDL_LogEvent(event);
}
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entry->event = *event;
if (event->type == SDL_SYSWMEVENT) {
entry->msg = *event->syswm.msg;
entry->event.syswm.msg = &entry->msg;
}
if (SDL_EventQ.tail) {
SDL_EventQ.tail->next = entry;
entry->prev = SDL_EventQ.tail;
SDL_EventQ.tail = entry;
entry->next = NULL;
} else {
SDL_assert(!SDL_EventQ.head);
SDL_EventQ.head = entry;
SDL_EventQ.tail = entry;
entry->prev = NULL;
entry->next = NULL;
}
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final_count = SDL_AtomicAdd(&SDL_EventQ.count, 1) + 1;
if (final_count > SDL_EventQ.max_events_seen) {
SDL_EventQ.max_events_seen = final_count;
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}
return 1;
}
/* Remove an event from the queue -- called with the queue locked */
static void
SDL_CutEvent(SDL_EventEntry *entry)
{
if (entry->prev) {
entry->prev->next = entry->next;
}
if (entry->next) {
entry->next->prev = entry->prev;
}
if (entry == SDL_EventQ.head) {
SDL_assert(entry->prev == NULL);
SDL_EventQ.head = entry->next;
}
if (entry == SDL_EventQ.tail) {
SDL_assert(entry->next == NULL);
SDL_EventQ.tail = entry->prev;
}
entry->next = SDL_EventQ.free;
SDL_EventQ.free = entry;
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SDL_assert(SDL_AtomicGet(&SDL_EventQ.count) > 0);
SDL_AtomicAdd(&SDL_EventQ.count, -1);
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}
/* Lock the event queue, take a peep at it, and unlock it */
int
SDL_PeepEvents(SDL_Event * events, int numevents, SDL_eventaction action,
Uint32 minType, Uint32 maxType)
{
int i, used;
/* Don't look after we've quit */
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if (!SDL_AtomicGet(&SDL_EventQ.active)) {
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/* We get a few spurious events at shutdown, so don't warn then */
if (action != SDL_ADDEVENT) {
SDL_SetError("The event system has been shut down");
}
return (-1);
}
/* Lock the event queue */
used = 0;
if (!SDL_EventQ.lock || SDL_LockMutex(SDL_EventQ.lock) == 0) {
if (action == SDL_ADDEVENT) {
for (i = 0; i < numevents; ++i) {
used += SDL_AddEvent(&events[i]);
}
} else {
SDL_EventEntry *entry, *next;
SDL_SysWMEntry *wmmsg, *wmmsg_next;
Uint32 type;
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if (action == SDL_GETEVENT) {
/* Clean out any used wmmsg data
FIXME: Do we want to retain the data for some period of time?
*/
for (wmmsg = SDL_EventQ.wmmsg_used; wmmsg; wmmsg = wmmsg_next) {
wmmsg_next = wmmsg->next;
wmmsg->next = SDL_EventQ.wmmsg_free;
SDL_EventQ.wmmsg_free = wmmsg;
}
SDL_EventQ.wmmsg_used = NULL;
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}
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for (entry = SDL_EventQ.head; entry && (!events || used < numevents); entry = next) {
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next = entry->next;
type = entry->event.type;
if (minType <= type && type <= maxType) {
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if (events) {
events[used] = entry->event;
if (entry->event.type == SDL_SYSWMEVENT) {
/* We need to copy the wmmsg somewhere safe.
For now we'll guarantee it's valid at least until
the next call to SDL_PeepEvents()
*/
if (SDL_EventQ.wmmsg_free) {
wmmsg = SDL_EventQ.wmmsg_free;
SDL_EventQ.wmmsg_free = wmmsg->next;
} else {
wmmsg = (SDL_SysWMEntry *)SDL_malloc(sizeof(*wmmsg));
}
wmmsg->msg = *entry->event.syswm.msg;
wmmsg->next = SDL_EventQ.wmmsg_used;
SDL_EventQ.wmmsg_used = wmmsg;
events[used].syswm.msg = &wmmsg->msg;
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}
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if (action == SDL_GETEVENT) {
SDL_CutEvent(entry);
}
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}
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++used;
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}
}
}
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if (SDL_EventQ.lock) {
SDL_UnlockMutex(SDL_EventQ.lock);
}
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} else {
return SDL_SetError("Couldn't lock event queue");
}
return (used);
}
SDL_bool
SDL_HasEvent(Uint32 type)
{
return (SDL_PeepEvents(NULL, 0, SDL_PEEKEVENT, type, type) > 0);
}
SDL_bool
SDL_HasEvents(Uint32 minType, Uint32 maxType)
{
return (SDL_PeepEvents(NULL, 0, SDL_PEEKEVENT, minType, maxType) > 0);
}
void
SDL_FlushEvent(Uint32 type)
{
SDL_FlushEvents(type, type);
}
void
SDL_FlushEvents(Uint32 minType, Uint32 maxType)
{
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/* !!! FIXME: we need to manually SDL_free() the strings in TEXTINPUT and
drag'n'drop events if we're flushing them without passing them to the
app, but I don't know if this is the right place to do that. */
645
/* Don't look after we've quit */
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if (!SDL_AtomicGet(&SDL_EventQ.active)) {
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return;
}
/* Make sure the events are current */
#if 0
/* Actually, we can't do this since we might be flushing while processing
a resize event, and calling this might trigger further resize events.
*/
SDL_PumpEvents();
#endif
/* Lock the event queue */
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if (!SDL_EventQ.lock || SDL_LockMutex(SDL_EventQ.lock) == 0) {
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SDL_EventEntry *entry, *next;
Uint32 type;
for (entry = SDL_EventQ.head; entry; entry = next) {
next = entry->next;
type = entry->event.type;
if (minType <= type && type <= maxType) {
SDL_CutEvent(entry);
}
}
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if (SDL_EventQ.lock) {
SDL_UnlockMutex(SDL_EventQ.lock);
}
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}
}
/* Run the system dependent event loops */
void
SDL_PumpEvents(void)
{
SDL_VideoDevice *_this = SDL_GetVideoDevice();
/* Get events from the video subsystem */
if (_this) {
_this->PumpEvents(_this);
}
#if !SDL_JOYSTICK_DISABLED
/* Check for joystick state change */
if ((!SDL_disabled_events[SDL_JOYAXISMOTION >> 8] || SDL_JoystickEventState(SDL_QUERY))) {
SDL_JoystickUpdate();
}
#endif
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#if !SDL_SENSOR_DISABLED
/* Check for sensor state change */
if (!SDL_disabled_events[SDL_SENSORUPDATE >> 8]) {
SDL_SensorUpdate();
}
#endif
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SDL_SendPendingSignalEvents(); /* in case we had a signal handler fire, etc. */
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}
/* Public functions */
int
SDL_PollEvent(SDL_Event * event)
{
return SDL_WaitEventTimeout(event, 0);
}
int
SDL_WaitEvent(SDL_Event * event)
{
return SDL_WaitEventTimeout(event, -1);
}
int
SDL_WaitEventTimeout(SDL_Event * event, int timeout)
{
Uint32 expiration = 0;
if (timeout > 0)
expiration = SDL_GetTicks() + timeout;
for (;;) {
SDL_PumpEvents();
switch (SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_FIRSTEVENT, SDL_LASTEVENT)) {
case -1:
return 0;
case 0:
if (timeout == 0) {
/* Polling and no events, just return */
return 0;
}
if (timeout > 0 && SDL_TICKS_PASSED(SDL_GetTicks(), expiration)) {
/* Timeout expired and no events */
return 0;
}
738
SDL_Delay(1);
739
break;
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default:
/* Has events */
return 1;
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}
}
}
int
SDL_PushEvent(SDL_Event * event)
{
event->common.timestamp = SDL_GetTicks();
752
if (SDL_EventOK.callback || SDL_event_watchers_count > 0) {
753
if (!SDL_event_watchers_lock || SDL_LockMutex(SDL_event_watchers_lock) == 0) {
754
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if (SDL_EventOK.callback && !SDL_EventOK.callback(SDL_EventOK.userdata, event)) {
if (SDL_event_watchers_lock) {
SDL_UnlockMutex(SDL_event_watchers_lock);
}
return 0;
}
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if (SDL_event_watchers_count > 0) {
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777
/* Make sure we only dispatch the current watcher list */
int i, event_watchers_count = SDL_event_watchers_count;
SDL_event_watchers_dispatching = SDL_TRUE;
for (i = 0; i < event_watchers_count; ++i) {
if (!SDL_event_watchers[i].removed) {
SDL_event_watchers[i].callback(SDL_event_watchers[i].userdata, event);
}
}
SDL_event_watchers_dispatching = SDL_FALSE;
if (SDL_event_watchers_removed) {
for (i = SDL_event_watchers_count; i--; ) {
if (SDL_event_watchers[i].removed) {
--SDL_event_watchers_count;
if (i < SDL_event_watchers_count) {
778
SDL_memmove(&SDL_event_watchers[i], &SDL_event_watchers[i+1], (SDL_event_watchers_count - i) * sizeof(SDL_event_watchers[i]));
779
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}
}
}
SDL_event_watchers_removed = SDL_FALSE;
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}
}
if (SDL_event_watchers_lock) {
SDL_UnlockMutex(SDL_event_watchers_lock);
}
}
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}
if (SDL_PeepEvents(event, 1, SDL_ADDEVENT, 0, 0) <= 0) {
return -1;
}
SDL_GestureProcessEvent(event);
return 1;
}
void
SDL_SetEventFilter(SDL_EventFilter filter, void *userdata)
{
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811
812
813
if (!SDL_event_watchers_lock || SDL_LockMutex(SDL_event_watchers_lock) == 0) {
/* Set filter and discard pending events */
SDL_EventOK.callback = filter;
SDL_EventOK.userdata = userdata;
SDL_FlushEvents(SDL_FIRSTEVENT, SDL_LASTEVENT);
if (SDL_event_watchers_lock) {
SDL_UnlockMutex(SDL_event_watchers_lock);
}
}
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818
}
SDL_bool
SDL_GetEventFilter(SDL_EventFilter * filter, void **userdata)
{
819
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824
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826
827
828
829
830
SDL_EventWatcher event_ok;
if (!SDL_event_watchers_lock || SDL_LockMutex(SDL_event_watchers_lock) == 0) {
event_ok = SDL_EventOK;
if (SDL_event_watchers_lock) {
SDL_UnlockMutex(SDL_event_watchers_lock);
}
} else {
SDL_zero(event_ok);
}
831
if (filter) {
832
*filter = event_ok.callback;
833
834
}
if (userdata) {
835
*userdata = event_ok.userdata;
836
}
837
return event_ok.callback ? SDL_TRUE : SDL_FALSE;
838
839
840
841
842
}
void
SDL_AddEventWatch(SDL_EventFilter filter, void *userdata)
{
843
844
845
if (!SDL_event_watchers_lock || SDL_LockMutex(SDL_event_watchers_lock) == 0) {
SDL_EventWatcher *event_watchers;
846
event_watchers = SDL_realloc(SDL_event_watchers, (SDL_event_watchers_count + 1) * sizeof(*event_watchers));
847
848
849
850
851
852
853
if (event_watchers) {
SDL_EventWatcher *watcher;
SDL_event_watchers = event_watchers;
watcher = &SDL_event_watchers[SDL_event_watchers_count];
watcher->callback = filter;
watcher->userdata = userdata;
854
watcher->removed = SDL_FALSE;
855
856
++SDL_event_watchers_count;
}
857
858
859
if (SDL_event_watchers_lock) {
SDL_UnlockMutex(SDL_event_watchers_lock);
860
861
862
863
864
865
866
}
}
}
void
SDL_DelEventWatch(SDL_EventFilter filter, void *userdata)
{
867
868
869
870
871
if (!SDL_event_watchers_lock || SDL_LockMutex(SDL_event_watchers_lock) == 0) {
int i;
for (i = 0; i < SDL_event_watchers_count; ++i) {
if (SDL_event_watchers[i].callback == filter && SDL_event_watchers[i].userdata == userdata) {
872
873
874
875
876
877
if (SDL_event_watchers_dispatching) {
SDL_event_watchers[i].removed = SDL_TRUE;
SDL_event_watchers_removed = SDL_TRUE;
} else {
--SDL_event_watchers_count;
if (i < SDL_event_watchers_count) {
878
SDL_memmove(&SDL_event_watchers[i], &SDL_event_watchers[i+1], (SDL_event_watchers_count - i) * sizeof(SDL_event_watchers[i]));
879
}
880
881
}
break;
882
}
883
884
885
886
}
if (SDL_event_watchers_lock) {
SDL_UnlockMutex(SDL_event_watchers_lock);
887
888
889
890
891
892
893
}
}
}
void
SDL_FilterEvents(SDL_EventFilter filter, void *userdata)
{
894
if (!SDL_EventQ.lock || SDL_LockMutex(SDL_EventQ.lock) == 0) {
895
896
897
898
899
900
901
SDL_EventEntry *entry, *next;
for (entry = SDL_EventQ.head; entry; entry = next) {
next = entry->next;
if (!filter(userdata, &entry->event)) {
SDL_CutEvent(entry);
}
}
902
903
904
if (SDL_EventQ.lock) {
SDL_UnlockMutex(SDL_EventQ.lock);
}
905
906
907
908
909
910
}
}
Uint8
SDL_EventState(Uint32 type, int state)
{
911
912
const SDL_bool isdnd = ((state == SDL_DISABLE) || (state == SDL_ENABLE)) &&
((type == SDL_DROPFILE) || (type == SDL_DROPTEXT));
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
Uint8 current_state;
Uint8 hi = ((type >> 8) & 0xff);
Uint8 lo = (type & 0xff);
if (SDL_disabled_events[hi] &&
(SDL_disabled_events[hi]->bits[lo/32] & (1 << (lo&31)))) {
current_state = SDL_DISABLE;
} else {
current_state = SDL_ENABLE;
}
if (state != current_state)
{
switch (state) {
case SDL_DISABLE:
/* Disable this event type and discard pending events */
if (!SDL_disabled_events[hi]) {
SDL_disabled_events[hi] = (SDL_DisabledEventBlock*) SDL_calloc(1, sizeof(SDL_DisabledEventBlock));
if (!SDL_disabled_events[hi]) {
/* Out of memory, nothing we can do... */
break;
}
}
SDL_disabled_events[hi]->bits[lo/32] |= (1 << (lo&31));
SDL_FlushEvent(type);
break;
case SDL_ENABLE:
SDL_disabled_events[hi]->bits[lo/32] &= ~(1 << (lo&31));
break;
default:
/* Querying state... */
break;
}
}
948
949
950
951
952
953
/* turn off drag'n'drop support if we've disabled the events.
This might change some UI details at the OS level. */
if (isdnd) {
SDL_ToggleDragAndDropSupport();
}
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
return current_state;
}
Uint32
SDL_RegisterEvents(int numevents)
{
Uint32 event_base;
if ((numevents > 0) && (SDL_userevents+numevents <= SDL_LASTEVENT)) {
event_base = SDL_userevents;
SDL_userevents += numevents;
} else {
event_base = (Uint32)-1;
}
return event_base;
}
int
SDL_SendAppEvent(SDL_EventType eventType)
{
int posted;
posted = 0;
if (SDL_GetEventState(eventType) == SDL_ENABLE) {
SDL_Event event;
event.type = eventType;
posted = (SDL_PushEvent(&event) > 0);
}
return (posted);
}
int
SDL_SendSysWMEvent(SDL_SysWMmsg * message)
{
int posted;
posted = 0;
if (SDL_GetEventState(SDL_SYSWMEVENT) == SDL_ENABLE) {
SDL_Event event;
SDL_memset(&event, 0, sizeof(event));
event.type = SDL_SYSWMEVENT;
event.syswm.msg = message;
posted = (SDL_PushEvent(&event) > 0);
}
/* Update internal event state */
return (posted);
}