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Hi Brian,
Actually you dont need to do that
Here's the patch which implements such kind of events - I did them because
I needed them for iOS, but they are generic enough to be used on any other
systems.
The patch implements a new call:
SDL_SetSystemEventHook(SDL_SystemEventHandler handler)
and a new event (SDL_SystemEvent) and 4 event types:
SDL_SYSEVENT_TERMINATE - system wants to terminate app
SDL_SYSEVENT_SUSPEND - system wants to suspend app
SDL_SYSEVENT_RESUME - system wants to resume app
SDL_SYSEVENT_LOWMEMORY - low memory warning

Other events can be easily added there.

At the beginning of your program you need to call SDL_SetSystemEventHook()
with a pointer to your event handler.
The event handler should be programmed like any other SDL event handler
ie.:

switch (event->Type)
{
case SDL_SYSEVENT_RESUME:
// do your stuff here
break;
case SDL_SYSEVENT_SUSPEND:
// do your stuff here
break;
}


The patch also modifies app delegates in SDL_uikitappdelegate.m to make
use of the hook if it was set up. It also adds
applicationDidReceiveMemoryWarning impementation, calling the hook.

regards,
Piotr

diff -r eb0e11b096ab include/SDL_events.h
--- a/include/SDL_events.h Wed Nov 16 05:13:40 2011 -0500
+++ b/include/SDL_events.h Mon Nov 28 13:40:24 2011 +0100
@@ -107,7 +107,14 @@

SDL_CLIPBOARDUPDATE = 0x900, /**< The clipboard changed */

- /* Obsolete events */
+ /* System events */
+
+ SDL_SYSEVENT_TERMINATE = 0xa00,
+ SDL_SYSEVENT_SUSPEND,
+ SDL_SYSEVENT_RESUME,
+ SDL_SYSEVENT_LOWMEMORY,
+
+ /* Obsolete events */
SDL_EVENT_COMPAT1 = 0x7000, /**< SDL 1.2 events for compatibility */
SDL_EVENT_COMPAT2,
SDL_EVENT_COMPAT3,
@@ -280,7 +287,7 @@


/**
- * \brief Touch finger motion/finger event structure (event.tfinger.*)
+ * \brief Touch finger motion/finger event structure (event.tmotion.*)
*/
typedef struct SDL_TouchFingerEvent
{
@@ -302,7 +309,7 @@


/**
- * \brief Touch finger motion/finger event structure (event.tbutton.*)
+ * \brief Touch finger motion/finger event structure (event.tmotion.*)
*/
typedef struct SDL_TouchButtonEvent
{
@@ -357,6 +364,15 @@
Uint32 type; /**< ::SDL_QUIT */
} SDL_QuitEvent;

+/**
+ * \brief System event
+ */
+
+typedef struct SDL_SystemEvent
+{
+ Uint32 type;
+ void *data;
+} SDL_SystemEvent;

/**
* \brief A user-defined event type (event.user.*)
@@ -437,7 +453,7 @@
SDL_TouchButtonEvent tbutton; /**< Touch button event data */
SDL_MultiGestureEvent mgesture; /**< Multi Finger Gesture data */
SDL_DollarGestureEvent dgesture; /**< Multi Finger Gesture data */
-
+ SDL_SystemEvent sysevent; /**< System event data */
/** Temporarily here for backwards compatibility */
/*@{*/
#ifndef SDL_NO_COMPAT
@@ -626,6 +642,16 @@
*/
extern DECLSPEC Uint32 SDLCALL SDL_RegisterEvents(int numevents);

+/**
+ * Set system event hook
+ *
+ */
+typedef int (SDLCALL * SDL_SystemEventHandler) (SDL_Event* event);
+
+extern DECLSPEC void SDLCALL
SDL_SetSystemEventHook(SDL_SystemEventHandler handler);
+
+
+
/* Ends C function definitions when using C++ */
#ifdef __cplusplus
/* *INDENT-OFF* */
diff -r eb0e11b096ab src/events/SDL_events.c
--- a/src/events/SDL_events.c Wed Nov 16 05:13:40 2011 -0500
+++ b/src/events/SDL_events.c Mon Nov 28 13:40:24 2011 +0100
@@ -36,6 +36,7 @@
/* Public data -- the event filter */
SDL_EventFilter SDL_EventOK = NULL;
void *SDL_EventOKParam;
+SDL_SystemEventHandler SDL_SysEventHandler = NULL;

typedef struct SDL_EventWatcher {
SDL_EventFilter callback;
@@ -528,4 +529,13 @@
return (posted);
}

+void
+SDL_SetSystemEventHook(SDL_SystemEventHandler handler)
+{
+ if (handler)
+ {
+ SDL_SysEventHandler=handler;
+ }
+}
+
/* vi: set ts=4 sw=4 expandtab: */
diff -r eb0e11b096ab src/events/SDL_events_c.h
--- a/src/events/SDL_events_c.h Wed Nov 16 05:13:40 2011 -0500
+++ b/src/events/SDL_events_c.h Mon Nov 28 13:40:24 2011 +0100
@@ -44,4 +44,7 @@
extern SDL_EventFilter SDL_EventOK;
extern void *SDL_EventOKParam;

+/* The system event hook function */
+extern SDL_SystemEventHandler SDL_SysEventHandler;
+
/* vi: set ts=4 sw=4 expandtab: */
diff -r eb0e11b096ab src/video/uikit/SDL_uikitappdelegate.m
--- a/src/video/uikit/SDL_uikitappdelegate.m Wed Nov 16 05:13:40 2011
-0500
+++ b/src/video/uikit/SDL_uikitappdelegate.m Mon Nov 28 13:40:24 2011
+0100
@@ -123,7 +123,12 @@

- (void)applicationWillTerminate:(UIApplication *)application
{
- SDL_SendQuit();
+ SDL_Event event;
+ event.type=SDL_SYSEVENT_TERMINATE;
+ event.sysevent.data=NULL;
+ if (SDL_SysEventHandler)
+ SDL_SysEventHandler(&event);
+ else SDL_SendQuit();
/* hack to prevent automatic termination. See SDL_uikitevents.m for
details */
longjmp(*(jump_env()), 1);
}
@@ -131,35 +136,58 @@
- (void) applicationWillResignActive:(UIApplication*)application
{
//NSLog(@"%@", NSStringFromSelector(_cmd));
+ SDL_Event event;
+ event.type=SDL_SYSEVENT_SUSPEND;
+ event.sysevent.data=NULL;
+ if (SDL_SysEventHandler)
+ SDL_SysEventHandler(&event);
+ else {
+ // Send every window on every screen a MINIMIZED event.
+ SDL_VideoDevice *_this = SDL_GetVideoDevice();
+ if (!_this) {
+ return;
+ }

- // Send every window on every screen a MINIMIZED event.
- SDL_VideoDevice *_this = SDL_GetVideoDevice();
- if (!_this) {
- return;
- }
-
- SDL_Window *window;
- for (window = _this->windows; window != nil; window = window->next) {
- SDL_SendWindowEvent(window, SDL_WINDOWEVENT_MINIMIZED, 0, 0);
- }
+ SDL_Window *window;
+ for (window = _this->windows; window != nil; window =
window->next) {
+ SDL_SendWindowEvent(window,
SDL_WINDOWEVENT_MINIMIZED, 0, 0);
+ }
+ }
}

- (void) applicationDidBecomeActive:(UIApplication*)application
{
//NSLog(@"%@", NSStringFromSelector(_cmd));

- // Send every window on every screen a RESTORED event.
- SDL_VideoDevice *_this = SDL_GetVideoDevice();
- if (!_this) {
- return;
- }
+ SDL_Event event;
+ event.type=SDL_SYSEVENT_RESUME;
+ event.sysevent.data=NULL;
+ if (SDL_SysEventHandler)
+ SDL_SysEventHandler(&event);
+ else {
+ // Send every window on every screen a RESTORED event.
+ SDL_VideoDevice *_this = SDL_GetVideoDevice();
+ if (!_this) {
+ return;
+ }

- SDL_Window *window;
- for (window = _this->windows; window != nil; window = window->next) {
- SDL_SendWindowEvent(window, SDL_WINDOWEVENT_RESTORED, 0, 0);
- }
+ SDL_Window *window;
+ for (window = _this->windows; window != nil; window =
window->next) {
+ SDL_SendWindowEvent(window,
SDL_WINDOWEVENT_RESTORED, 0, 0);
+ }
+ }
}

+- (void)applicationDidReceiveMemoryWarning:(UIApplication*)application
+{
+ //NSLog(@"%@", NSStringFromSelector(_cmd));
+
+ SDL_Event event;
+ event.type=SDL_SYSEVENT_LOWMEMORY;
+ event.sysevent.data=NULL;
+ if (SDL_SysEventHandler)
+ SDL_SysEventHandler(&event);
+}
@end

#endif /* SDL_VIDEO_DRIVER_UIKIT */





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