ofxUI + ofParameter

advanced
#1

I was having some trouble binding ofParameter references to ofxUI widgets – I was able to fix it in a hacky way.

For example, say I have an ofParameter<float> variable which I want to bind to a slider. ofParameter’s get() function returns a reference to the value, so it compiles, but the variable does not change when I adjust the slider.

ofParameter<float> var;
ofxUICanvas *gui = new ofxUICanvas("gui");
gui->addSlider("slider", 0.0, 1.0, var.get());

I suspect the problem was that reference was a constant, so I got around this by making a getRef() method in ofParameter which is the same as get() except not const.

const ParameterType & get() const; 
ParameterType & getRef();   // added

template<typename ParameterType>
inline ParameterType & ofParameter<ParameterType>::getRef() {
    return obj->value;
}

The slider now works properly, but I am wondering if there is a better way to do this using whats already in the ofParameter class?

#2

the correct thing would be to adapt ofxUI to use ofParameter so internally it will store an ofParameter, use it’s events… but that would be a lot of work.

#3

oooh i like this. been thinking of moving from ofxGui, because whilst its good, it has many flaws. but i guess that anything in context :wink:

thanks for the hack just means i dont have to bash my head against a wall now thinking on what to do.

ofParameter/ofParameterGroup are possibly some of my most used oF things. hopefully it will start making it into future addons, just so then everything is more linked when needed to be