nextcloud-apps/files_reader/vendor/pdfjs/controllers/toc_controller.js

PDFJS.reader.TocController = function(toc) {
	var book = this.book;

	var $list = $("#tocView"),
			docfrag = document.createDocumentFragment();

	var currentChapter = false;

	var generateTocItems = function(toc, level) {
		var container = document.createElement("ul");

		if(!level) level = 1;

		toc.forEach(function(chapter) {
			var listitem = document.createElement("li"),
					link = document.createElement("a");
					toggle = document.createElement("a");

			var subitems;

			listitem.id = "toc-"+chapter.id;
			listitem.classList.add('list_item');

			link.textContent = chapter.label;
			link.href = chapter.href;

			link.classList.add('toc_link');

			listitem.appendChild(link);

			if(chapter.subitems.length > 0) {
				level++;
				subitems = generateTocItems(chapter.subitems, level);
				toggle.classList.add('toc_toggle');

				listitem.insertBefore(toggle, link);
				listitem.appendChild(subitems);
			}


			container.appendChild(listitem);

		});

		return container;
	};

	var onShow = function() {
        $list.addClass('open');
	};

	var onHide = function() {
        $list.removeClass('open');
	};

	var chapterChange = function(e) {
		var id = e.id,
				$item = $list.find("#toc-"+id),
				$current = $list.find(".currentChapter"),
				$open = $list.find('.openChapter');

		if($item.length){

			if($item != $current && $item.has(currentChapter).length > 0) {
				$current.removeClass("currentChapter");
			}

			$item.addClass("currentChapter");

			// $open.removeClass("openChapter");
			$item.parents('li').addClass("openChapter");
		}
	};

	book.on('renderer:chapterDisplayed', chapterChange);

	var tocitems = generateTocItems(toc);

	docfrag.appendChild(tocitems);

	$list.append(docfrag);
	$list.find(".toc_link").on("click", function(event){
			var url = this.getAttribute('href');

			event.preventDefault();

			//-- Provide the Book with the url to show
			//   The Url must be found in the books manifest
			book.goto(url);

			$list.find(".currentChapter")
					.addClass("openChapter")
					.removeClass("currentChapter");

			$(this).parent('li').addClass("currentChapter");

	});

	$list.find(".toc_toggle").on("click", function(event){
			var $el = $(this).parent('li'),
					open = $el.hasClass("openChapter");

			event.preventDefault();
			if(open){
				$el.removeClass("openChapter");
			} else {
				$el.addClass("openChapter");
			}
	});

	return {
		"show" : onShow,
		"hide" : onHide
	};
};