openFrameworks / get a widget/parameter from and ofxGuiGroup

ofApp.cpp

//https://forum.openframeworks.cc/t/can-iterate-though-all-ofxgui-elements/35047/11	
//https://forum.openframeworks.cc/t/its-posible-to-avoid-ofxgui-float-ofxslider-label-style-2-8e-15-to-0-000028/35953/2

gui.setup(parameters);

	//iterate through all elements of this gui
	for (int i = 0; i < gui.getNumControls(); i++) {
		auto control = gui.getControl(i);

		//check if one of the elements might be a parameterGroup; i.e. parameter contains multiple items
		string paramString = ofToString(control->getParameter());

		if (ofIsStringInString(paramString, ":")) {
			//it's a group, so iterate through each group element
			ofxGuiGroup aGroup = gui.getGroup(control->getName());

			for (int n = 0; n < aGroup.getNumControls(); n++) {
				auto g_control = aGroup.getControl(n);
				cout << ofToString(i) << " " << ofToString(control->getName()) << " : " << ofToString(g_control->getName()) << endl;

				//customize widget
				if (g_control->getName() == renderer1.size.getName()) {
					auto w = g_control->getWidth();
					g_control->setSize(w, 40);
					g_control->setFillColor(ofColor::red);
				}
			}
		}
		else {
			//it's a parameter
			cout << ofToString(i) << " " << ofToString(control->getName()) << endl;
			
			//customize widget
			if (control->getName() == f.getName()) {
				auto w = control->getWidth();
				control->setSize(w, 40);
				control->setFillColor(ofColor::red);
			}
		}
	}