#include "src/rplexternals.h"
#include "motif.h"

declareExternalFunction(XtAddCallback)
	declareObject(widget);
	declareObject(callbackName);
	declareObject(callbackProc);
	declareObject(subList);
	declareObject(procStatus);

	string				type;

	String				callback;

	HEADER
		declareHelpString("Add callback to a widget\n"
				"    3: widget\n"
				"    2: callback name (XmNactivateCallback)\n"
				"    1: expression\n");
		numberOfArguments(3);
	FUNCTION
		if (initializationDone eq true) then
			pullFromStack(callbackProc, unknown);
			returnOnError(freeObject(callbackProc));

			pullFromStack(callbackName, string);
			returnOnError(freeObject(callbackProc); freeObject(callbackName));

			pullFromStack(widget, external);
			returnOnError(freeObject(callbackProc); freeObject(callbackName);
					freeObject(widget));

			ifIsExternal(widget, WIDGET) then
			orElse
				executionError("Type mismatch error");
				returnOnError(freeObject(callbackProc);
						freeObject(callbackName); freeObject(widget));
			endIf

			getString(callbackName, type);

			if (strcmp(type, "XmNactivateCallback") eq 0) then
				callback = XmNactivateCallback;
			orElse
				executionError("Unknown callback type");
				returnOnError(freeObject(callbackProc);
						freeObject(callbackName); freeObject(widget));
			endIf

			// Adding a copy of expression in a list.

			dupObject(callbackProc);

			createListObject(subList);
			createObject(procStatus);

			objectContainer(procStatus) = address(procStatus(rpl_arguments));

			insertObjectIntoList(subList, callbackProc);
			insertObjectIntoList(subList, procStatus);
			insertObjectIntoList(callbacksList, subList);

			XtAddCallback(target((Widget *) objectContainer(widget)),
					callback, rplCallback, (XtPointer) subList);
		orElse
			executionError("Application not initialized");
			returnOnError();
		endIf
	END
endExternalFunction

// vim: ts=4