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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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define([], function() {
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/**
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* When embedded the communicator helps talk to the parent page.
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* This is a copy of the H5P.communicator, which we need to communicate in this context
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*/
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var H5PEmbedCommunicator = function() {
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this._actionHandlers = {};
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this.registerEventListeners();
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};
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/** @type {Object} Maps actions to functions. */
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H5PEmbedCommunicator.prototype._actionHandlers = {};
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/**
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* Register action listener.
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*
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* @param {string} action What you are waiting for
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* @param {function} handler What you want done
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*/
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H5PEmbedCommunicator.prototype.on = function(action, handler) {
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this._actionHandlers[action] = handler;
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};
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/**
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* Send a message to the all mighty father.
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*
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* @param {string} action
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* @param {Object} [data] payload
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*/
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H5PEmbedCommunicator.prototype.send = function(action, data) {
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if (data === undefined) {
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data = {};
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}
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data.context = 'h5p';
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data.action = action;
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// Parent origin can be anything.
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window.parent.postMessage(data, '*');
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};
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/**
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* Register event listeners for the communicator.
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*
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* @method registerEventListeners
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*/
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H5PEmbedCommunicator.prototype.registerEventListeners = function() {
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var self = this;
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// Register message listener.
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window.addEventListener('message', function receiveMessage(event) {
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if (window.parent !== event.source || event.data.context !== 'h5p') {
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return; // Only handle messages from parent and in the correct context.
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}
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if (self._actionHandlers[event.data.action] !== undefined) {
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self._actionHandlers[event.data.action](event.data);
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}
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}, false);
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};
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return new H5PEmbedCommunicator();
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});
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