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/*
PsychSourceGL/Source/Common/CocoaEventBridge/COCOAEVENTBRIDGECharAvail.c
PROJECTS:
CocoaEventBridge only
AUTHORS:
Allen.Ingling@nyu.edu awi
PLATFORMS:
Only OS X.
HISTORY:
9/15/05 awi Wrote it .
*/
#include "EventBridgeBundleHeader.h"
//#include "CocoaEventBridgeHelpers.h"
#include "CocoaEventBridge.h"
static char useString[] = "avail=CocoaEventBridge('CharAvail');";
static char synopsisString[] =
"Return 1 if a character is available in the event queue, 0 if not. Note "
"that this routine leaves the character in the queue. Call GetChar to "
"remove the character from the event queue."
"\n\n"
"Do not call CocoaEventBridge('CharAvail') directly. Instead, use the Psychtoolbox function \"CharAvail\".";
static char seeAlsoString[] = "";
PsychError COCOAEVENTBRIDGECharAvail(void)
{
psych_bool loadBundleError, charAvail;
int numKeypresses;
//all subfunctions should have these two lines.
PsychPushHelp(useString, synopsisString, seeAlsoString);
if(PsychIsGiveHelp()){PsychGiveHelp();return(PsychError_none);};
loadBundleError=LoadCocoaBundle();
if(loadBundleError)
PsychErrorExitMsg(PsychError_internal, "Failed to load the cocoa bundle.");
//check to see if the user supplied superfluous arguments
PsychErrorExit(PsychCapNumOutputArgs(1));
PsychErrorExit(PsychCapNumInputArgs(0));
//Open the window. OpenGetCharWindow() and MakeGetCharWindowInvisible() only act once if called repeatedly.
OpenGetCharWindow();
#ifndef DEBUG_USE_VISIBLE_WINDOW
MakeGetCharWindowInvisible();
#endif
numKeypresses=GetNumKeypresses();
charAvail= numKeypresses > 0;
PsychCopyOutFlagArg(1, kPsychArgOptional, charAvail);
return(PsychError_none);
}
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