onProgressClicked( event ) {

		this.Reveal.onUserInput( event );

		event.preventDefault();

		let slides = this.Reveal.getSlides();
		let slidesTotal = slides.length;
		let slideIndex = Math.floor( ( event.clientX / this.getMaxWidth() ) * slidesTotal );

		if( this.Reveal.getConfig().rtl ) {
			slideIndex = slidesTotal - slideIndex;
		}

		let targetIndices = this.Reveal.getIndices(slides[slideIndex]);
		this.Reveal.slide( targetIndices.h, targetIndices.v );

	}
Clicking on the progress bar results in a navigation to the
closest approximate horizontal slide using this equation:

( clickX / presentationWidth ) * numberOfSlides

@param {object} event