JSDoc: Source: item_radio.js

# Source: item_radio.js

    /*************************************************************
     *
     *  Copyright (c) 2015-2016 The MathJax Consortium
     *
     *  Licensed under the Apache License, Version 2.0 (the "License");
     *  you may not use this file except in compliance with the License.
     *  You may obtain a copy of the License at
     *
     *      http://www.apache.org/licenses/LICENSE-2.0
     *
     *  Unless required by applicable law or agreed to in writing, software
     *  distributed under the License is distributed on an "AS IS" BASIS,
     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     *  See the License for the specific language governing permissions and
     *  limitations under the License.
     */
    /**
     * @fileoverview Class of radio buttons.
     *
     * @author volker.sorge@gmail.com (Volker Sorge)
     */
    /// <reference path="abstract_item.ts" />
    /// <reference path="menu_util.ts" />
    /// <reference path="variable_item.ts" />
    var ContextMenu;
    (function (ContextMenu) {
        class Radio extends ContextMenu.AbstractItem {
            /**
             * @constructor
             * @extends {AbstractItem}
             * @param {Menu} menu The context menu or sub-menu the item belongs to.
             * @param {string} content The content of the menu item.
             * @param {string} variable The variable that is changed.
             * @param {string=} id Optionally the id of the menu item.
             */
            constructor(menu, content, variable, id) {
                super(menu, 'radio', content, id);
                /**
                 * @override
                 */
                this.role = 'menuitemradio';
                this.variable = menu.getPool().lookup(variable);
                this.register();
            }
            /**
             * Parses a JSON respresentation of a radio item.
             * @param {JSON} json The JSON object to parse.
             * @param {Menu} menu The menu the item is attached to.
             * @return {Radio} The new radio object.
             */
            static parse({ content: content, variable: variable, id: id }, menu) {
                return new Radio(menu, content, variable, id);
            }
            /**
             * @override
             */
            executeAction() {
                let oldValue = this.variable.getValue();
                if (oldValue === this.getId()) {
                    return;
                }
                this.variable.setValue(this.getId());
                ContextMenu.MenuUtil.close(this);
            }
            /**
             * @override
             */
            generateHtml() {
                super.generateHtml();
                let html = this.getHtml();
                this.span = document.createElement('span');
                this.span.textContent = '\u2713';
                this.span.classList.add(ContextMenu.HtmlClasses['MENURADIOCHECK']);
                html.appendChild(this.span);
                this.update();
            }
            /**
             * @override
             */
            register() {
                this.variable.register(this);
            }
            /**
             * @override
             */
            unregister() {
                this.variable.unregister(this);
            }
            /**
             * @override
             */
            update() {
                this.updateAria();
                this.updateSpan();
            }
            /**
             * Toggles the aria checked attribute.
             */
            updateAria() {
                this.getHtml().setAttribute('aria-checked', this.variable.getValue() === this.getId() ? 'true' : 'false');
            }
            /**
             * Toggles the checked tick.
             */
            updateSpan() {
                this.span.style.display =
                    this.variable.getValue() === this.getId() ? '' : 'none';
            }
        }
        ContextMenu.Radio = Radio;
    })(ContextMenu || (ContextMenu = {}));