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 = {}));