示例#1
0
int selectDevice(int devNum)
{
    /* Valid to select nullDevice, but that will open a new device.
       See ?dev.set.
     */
    if((devNum >= 0) && (devNum < R_MaxDevices) &&
       (R_Devices[devNum] != NULL) && active[devNum])
    {
	pGEDevDesc gdd;

	if (!NoDevices()) {
	    pGEDevDesc oldd = GEcurrentDevice();
	    if (oldd->dev->deactivate) oldd->dev->deactivate(oldd->dev);
	}

	R_CurrentDevice = devNum;

	/* maintain .Device */
	gsetVar(R_DeviceSymbol,
		elt(getSymbolValue(R_DevicesSymbol), devNum),
		R_BaseEnv);

	gdd = GEcurrentDevice(); /* will start a device if current is null */
	if (!NoDevices()) /* which it always will be */
	    if (gdd->dev->activate) gdd->dev->activate(gdd->dev);
	return devNum;
    }
    else
	return selectDevice(nextDevice(devNum));
}
示例#2
0
void GEaddDevice(pGEDevDesc gdd)
{
    int i;
    Rboolean appnd;
    SEXP s, t;
    pGEDevDesc oldd;

    PROTECT(s = getSymbolValue(R_DevicesSymbol));

    if (!NoDevices())  {
	oldd = GEcurrentDevice();
	if(oldd->dev->deactivate) oldd->dev->deactivate(oldd->dev);
    }

    /* find empty slot for new descriptor */
    i = 1;
    if (CDR(s) == R_NilValue)
	appnd = TRUE;
    else {
	s = CDR(s);
	appnd = FALSE;
    }
    while (R_Devices[i] != NULL) {
	i++;
	if (CDR(s) == R_NilValue)
	    appnd = TRUE;
	else
	    s = CDR(s);
    }
    R_CurrentDevice = i;
    R_NumDevices++;
    R_Devices[i] = gdd;
    active[i] = TRUE;

    GEregisterWithDevice(gdd);
    if(gdd->dev->activate) gdd->dev->activate(gdd->dev);

    /* maintain .Devices (.Device has already been set) */
    t = PROTECT(duplicate(getSymbolValue(R_DeviceSymbol)));
    if (appnd)
	SETCDR(s, CONS(t, R_NilValue));
    else
	SETCAR(s, t);

    UNPROTECT(2);

    /* In case a device driver did not call R_CheckDeviceAvailable
       before starting its allocation, we complete the allocation and
       then call killDevice here.  This ensures that the device gets a
       chance to deallocate its resources and the current active
       device is restored to a sane value. */
    if (i == R_MaxDevices - 1) {
	killDevice(i);
	error(_("too many open devices"));
    }
}
void onBeforeExecute(DeviceContext* pDC)
{
   // if the shadow device has somehow become the active device
   // then switch to the rstudio device. note this can occur if the
   // user creates another device such as windows() or postscript() and
   // then does a dev.off
   pGEDevDesc pCurrentDevice = NoDevices() ? NULL : GEcurrentDevice();
   ShadowDeviceData* pShadowDevData = (ShadowDeviceData*)pDC->pDeviceSpecific;
   if (pCurrentDevice != NULL && pShadowDevData != NULL)
   {
      if (pCurrentDevice->dev == pShadowDevData->pShadowPngDevice)
      {
         // select the rstudio device
         selectDevice(ndevNumber(pDC->dev));
      }
   }
}
示例#4
0
文件: gevents.c 项目: Bgods/r-source
Rboolean haveListeningDev()
{
    Rboolean ret = FALSE;
    pDevDesc dd;
    pGEDevDesc gd;
    if(!NoDevices())
    {
	for(int i = 1; i < NumDevices(); i++)
	{
	    if ((gd = GEgetDevice(i)) && (dd = gd->dev)
		 && dd->gettingEvent){
		ret = TRUE;
		break;
	    }
	}
    }
    return ret;
}
示例#5
0
pGEDevDesc GEcurrentDevice(void)
{
    /* If there are no active devices
     * check the options for a "default device".
     * If there is one, start it up. */
    if (NoDevices()) {
	SEXP defdev = GetOption1(install("device"));
	if (isString(defdev) && length(defdev) > 0) {
	    SEXP devName = install(CHAR(STRING_ELT(defdev, 0)));
	    /*  Not clear where this should be evaluated, since
		grDevices need not be in the search path.
		So we look for it first on the global search path.
	    */
	    defdev = findVar(devName, R_GlobalEnv);
	    if(defdev != R_UnboundValue) {
		PROTECT(defdev = lang1(devName));
		eval(defdev, R_GlobalEnv);
		UNPROTECT(1);
	    } else {
		/* Not globally visible:
		   try grDevices namespace if loaded.
		   The option is unlikely to be set if it is not loaded,
		   as the default setting is in grDevices:::.onLoad.
		*/
		SEXP ns = findVarInFrame(R_NamespaceRegistry,
					 install("grDevices"));
		if(ns != R_UnboundValue &&
		   findVar(devName, ns) != R_UnboundValue) {
		    PROTECT(defdev = lang1(devName));
		    eval(defdev, ns);
		    UNPROTECT(1);
		} else
		    error(_("no active or default device"));
	    }
	} else if(TYPEOF(defdev) == CLOSXP) {
	    PROTECT(defdev = lang1(defdev));
	    eval(defdev, R_GlobalEnv);
	    UNPROTECT(1);
	} else
	    error(_("no active or default device"));
    }
    return R_Devices[R_CurrentDevice];
}
示例#6
0
SEXP attribute_hidden
do_getGraphicsEvent(SEXP call, SEXP op, SEXP args, SEXP env)
{
    SEXP result = R_NilValue, prompt;
    pDevDesc dd;
    pGEDevDesc gd;
    int i, count=0, devNum;

    checkArity(op, args);
    
    prompt = CAR(args);
    if (!isString(prompt) || !length(prompt)) error(_("invalid prompt"));

    /* NB:  cleanup of event handlers must be done by driver in onExit handler */
    
    if (!NoDevices()) {
        /* Initialize all devices */
        i = 1;
	devNum = curDevice();
	while (i++ < NumDevices()) {
	    gd = GEgetDevice(devNum);
	    dd = gd->dev;
	    if (dd->gettingEvent)
	    	error(_("recursive use of getGraphicsEvent not supported"));
	    if (dd->eventEnv != R_NilValue) {
	        if (dd->eventHelper) dd->eventHelper(dd, 1);
	        dd->gettingEvent = TRUE;
	        defineVar(install("result"), R_NilValue, dd->eventEnv);
	        count++;
	    }
	    devNum = nextDevice(devNum);
	}
	if (!count)
	    error(_("no graphics event handlers set"));
	    
	Rprintf("%s\n", CHAR(asChar(prompt)));
	R_FlushConsole();

	/* Poll them */
	while (result == R_NilValue) {
	    R_ProcessEvents();
	    R_CheckUserInterrupt();
	    i = 1;
	    devNum = curDevice();
	    while (i++ < NumDevices()) {
		gd = GEgetDevice(devNum);
		dd = gd->dev;
		if (dd->eventEnv != R_NilValue) {
		    if (dd->eventHelper) dd->eventHelper(dd, 2);
		    result = findVar(install("result"), dd->eventEnv);
		    if (result != R_NilValue && result != R_UnboundValue) {
		        break;
		    }
		}
		devNum = nextDevice(devNum);
	    }
	}
	/* clean up */
        i = 1;
	devNum = curDevice();
	while (i++ < NumDevices()) {
	    gd = GEgetDevice(devNum);
	    dd = gd->dev;
	    if (dd->eventEnv != R_NilValue) {
	        if (dd->eventHelper) dd->eventHelper(dd, 0);
	        dd->gettingEvent = FALSE;
	    }
	    devNum = nextDevice(devNum);
	}
	
    }
    return(result);
}