ofxUI better buttons

ButtonFunction.h

template<typename F>
class ButtonFunction
{
	ofxUIButton * widget;
	F f;
public:
	ButtonFunction(ofxUIButton * b, F _f):widget(b), f(_f)
	{
		ofxUICanvas * gui = static_cast<ofxUICanvas*>(widget->getCanvasParent());
		ofAddListener(gui->newGUIEvent, this, &ButtonFunction::guiEvent);
	}
	void guiEvent(ofxUIEventArgs & e)
	{
		if (e.widget == static_cast<ofxUIWidget*>(widget)
			and widget->getValue() == false)
		{
			f();
		}
	}
};

template<typename F>
inline ButtonFunction<F> * connectButtonFunction(ofxUIButton * b, F f)
{
	return new ButtonFunction<F>(b, f);
}