Method addCallback

src/signal_handler.cpp:107–131

	}

	int SignalHandler::addCallback(const char *signal, Local<Value> cb)
	{
		Nan::HandleScope scope;

		int slotId = callbacks.count();

		// Create a new callback
		Callback *callback = new Callback();
		callback->signature = strdup(signal);
		callback->handler = new Nan::Callback(cb.As<Function>());
		callbacks.append(callback);

		// No object can be hooked yet
		if (obj == NULL)
			return slotId;

		// Connect to signal
		int signalId = findSignalId(callback->signature);
		if (signalId == -1)
			return -1;

		QMetaObject::connect(obj, signalId, this, slotId + QObject::metaObject()->methodCount());

		return signalId;
	}
}