root-container.js (1525B)
1 /* This Source Code Form is subject to the terms of the Mozilla Public 2 * License, v. 2.0. If a copy of the MPL was not distributed with this 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 4 5 "use strict"; 6 7 /** 8 * Dummy container node used for the root document element. 9 */ 10 class RootContainer { 11 constructor(markupView, node) { 12 this.doc = markupView.doc; 13 this.elt = this.doc.createElement("ul"); 14 // Root container has tree semantics for accessibility. 15 this.elt.setAttribute("role", "tree"); 16 this.elt.setAttribute("tabindex", "0"); 17 this.elt.setAttribute("aria-dropeffect", "none"); 18 this.elt.container = this; 19 this.children = this.elt; 20 this.node = node; 21 this.toString = () => "[root container]"; 22 } 23 24 hasChildren = true; 25 expanded = true; 26 update() {} 27 destroy() {} 28 29 /** 30 * If the node has children, return the list of containers for all these children. 31 * 32 * @return {Array} An array of child containers or null. 33 */ 34 getChildContainers() { 35 return [...this.children.children] 36 .filter(node => node.container) 37 .map(node => node.container); 38 } 39 40 /** 41 * Set the expanded state of the container node. 42 * 43 * @param {boolean} value 44 */ 45 setExpanded() {} 46 47 /** 48 * Set an appropriate role of the container's children node. 49 */ 50 setChildrenRole() {} 51 52 /** 53 * Set an appropriate DOM tree depth level for a node and its subtree. 54 */ 55 updateLevel() {} 56 57 isSlotted() { 58 return false; 59 } 60 } 61 62 module.exports = RootContainer;