Overriding IncDec Slider Draw

Where is the code located which draws the IncDecButtons slider style, as I would like to override it to draw the ‘slider’ like below; with buttons on either side and different paths drawn to surround the value (such as a rounded rectangle)?

Screen Shot

You’ll need to create your own custom LookAndFeel and override the Slider::LookAndFeelMethods::createSliderButton() and createSliderTextBox() methods to draw your own widgets.