Method createFragmentTriggersForPage

js/controllers/scrollview.js:463–497

* Creates one scroll trigger for each fragments in the given page. * * @param {*} page

( page, slideElement )

	 * @param {*} page
	 */
	createFragmentTriggersForPage( page, slideElement ) {

		slideElement = slideElement || page.slideElement;

		// Each fragment 'group' is an array containing one or more
		// fragments. Multiple fragments that appear at the same time
		// are part of the same group.
		const fragmentGroups = this.Reveal.fragments.sort( slideElement.querySelectorAll( '.fragment' ), true );

		// Create scroll triggers that show/hide fragments
		if( fragmentGroups.length ) {
			page.fragments = this.Reveal.fragments.sort( slideElement.querySelectorAll( '.fragment:not(.disabled)' ) );
			page.scrollTriggers.push(
				// Trigger for the initial state with no fragments visible
				{
					activate: () => {
						this.Reveal.fragments.update( -1, page.fragments, slideElement );
					}
				}
			);

			// Triggers for each fragment group
			fragmentGroups.forEach( ( fragments, i ) => {
				page.scrollTriggers.push({
					activate: () => {
						this.Reveal.fragments.update( i, page.fragments, slideElement );
					}
				});
			} );
		}


		return page.scrollTriggers.length;

	}

	/**
	 * Creates scroll triggers for the auto-animate steps in the