add slidenumber & location controllers

js/controllers/location.js

@@ -0,0 +1,51 @@
+import { enterFullscreen } from '../utils/util.js'
+
+/**
+ * Handles all reveal.js keyboard interactions.
+ */
+export default class Location {
+
+	constructor( Reveal ) {
+
+		this.Reveal = Reveal;
+
+	}
+
+	/**
+	 * Return a hash URL that will resolve to the given slide location.
+	 *
+	 * @param {HTMLElement} [slide=currentSlide] The slide to link to
+	 */
+	getHash( slide = this.Reveal.getCurrentSlide() ) {
+
+		let url = '/';
+
+		// Attempt to create a named link based on the slide's ID
+		let id = slide ? slide.getAttribute( 'id' ) : null;
+		if( id ) {
+			id = encodeURIComponent( id );
+		}
+
+		let index = this.Reveal.getIndices( slide );
+		if( !this.Reveal.getConfig().fragmentInURL ) {
+			index.f = undefined;
+		}
+
+		// If the current slide has an ID, use that as a named link,
+		// but we don't support named links with a fragment index
+		if( typeof id === 'string' && id.length && index.f === undefined ) {
+			url = '/' + id;
+		}
+		// Otherwise use the /h/v index
+		else {
+			let hashIndexBase = this.Reveal.getConfig().hashOneBasedIndex ? 1 : 0;
+			if( index.h > 0 || index.v > 0 || index.f !== undefined ) url += index.h + hashIndexBase;
+			if( index.v > 0 || index.f !== undefined ) url += '/' + (index.v + hashIndexBase );
+			if( index.f !== undefined ) url += '/' + index.f;
+		}
+
+		return url;
+
+	}
+
+}