jitsi_corner9/modules/UI/prezi/PreziPlayer.js

/* global PreziPlayer */
/* jshint -W101 */
(function() {
    "use strict";
    var __bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; };

    window.PreziPlayer = (function() {

        PreziPlayer.API_VERSION = 1;
        PreziPlayer.CURRENT_STEP = 'currentStep';
        PreziPlayer.CURRENT_ANIMATION_STEP = 'currentAnimationStep';
        PreziPlayer.CURRENT_OBJECT = 'currentObject';
        PreziPlayer.STATUS_LOADING = 'loading';
        PreziPlayer.STATUS_READY = 'ready';
        PreziPlayer.STATUS_CONTENT_READY = 'contentready';
        PreziPlayer.EVENT_CURRENT_STEP = "currentStepChange";
        PreziPlayer.EVENT_CURRENT_ANIMATION_STEP = "currentAnimationStepChange";
        PreziPlayer.EVENT_CURRENT_OBJECT = "currentObjectChange";
        PreziPlayer.EVENT_STATUS = "statusChange";
        PreziPlayer.EVENT_PLAYING = "isAutoPlayingChange";
        PreziPlayer.EVENT_IS_MOVING = "isMovingChange";
        PreziPlayer.domain = "https://prezi.com";
        PreziPlayer.path = "/player/";
        PreziPlayer.players = {};
        PreziPlayer.binded_methods = ['changesHandler'];

        PreziPlayer.createMultiplePlayers = function(optionArray){
            for(var i=0; i<optionArray.length; i++) {
                var optionSet = optionArray[i];
                new PreziPlayer(optionSet.id, optionSet);
            }
        };

        PreziPlayer.messageReceived = function(event){
            var message, item, player;
            try {
                message = JSON.parse(event.data);
                if (message.id && (player = PreziPlayer.players[message.id])) {
                    if (player.options.debug === true) {
                        if (console && console.log)
                            console.log('received', message);
                    }
                    if (message.type === "changes") {
                        player.changesHandler(message);
                    }
                    for (var i = 0; i < player.callbacks.length; i++) {
                        item = player.callbacks[i];
                        if (item && message.type === item.event) {
                            item.callback(message);
                        }
                    }
                }
            } catch (e) { }
        };

/*jshint -W004 */
        function PreziPlayer(id, options) {
/*jshint +W004 */
            var params, paramString = "", _this = this;
            if (PreziPlayer.players[id]){
                PreziPlayer.players[id].destroy();
            }
            for(var i=0; i<PreziPlayer.binded_methods.length; i++) {
                var method_name = PreziPlayer.binded_methods[i];
                _this[method_name] = __bind(_this[method_name], _this);
            }
            options = options || {};
            this.options = options;
            this.values = {'status': PreziPlayer.STATUS_LOADING};
            this.values[PreziPlayer.CURRENT_STEP] = 0;
            this.values[PreziPlayer.CURRENT_ANIMATION_STEP] = 0;
            this.values[PreziPlayer.CURRENT_OBJECT] = null;
            this.callbacks = [];
            this.id = id;
            this.embedTo = document.getElementById(id);
            if (!this.embedTo) {
                throw "The element id is not available.";
            }
            this.iframe = document.createElement('iframe');
            params = [
                { name: 'oid', value: options.preziId },
                { name: 'explorable', value: options.explorable ? 1 : 0 },
                { name: 'controls', value: options.controls ? 1 : 0 }
            ];
            for (i=0; i<params.length; i++) {
                var param = params[i];
                paramString += (i===0 ? "?" : "&") + param.name + "=" + param.value;
            }
            this.iframe.src = PreziPlayer.domain + PreziPlayer.path + paramString;
            this.iframe.frameBorder = 0;
            this.iframe.scrolling = "no";
            this.iframe.width = options.width || 640;
            this.iframe.height = options.height || 480;
            this.embedTo.innerHTML = '';
            // JITSI: IN CASE SOMETHING GOES WRONG.
            try {
                this.embedTo.appendChild(this.iframe);
            }
            catch (err) {
                console.log("CATCH ERROR");
            }

            // JITSI: Increase interval from 200 to 500, which fixes prezi
            // crashes for us.
            this.initPollInterval = setInterval(function(){
                _this.sendMessage({'action': 'init'});
            }, 500);
            PreziPlayer.players[id] = this;
        }

        PreziPlayer.prototype.changesHandler = function(message) {
            var key, value, j, item;
            if (this.initPollInterval) {
                clearInterval(this.initPollInterval);
                this.initPollInterval = false;
            }
            for (key in message.data) {
                if (message.data.hasOwnProperty(key)){
                    value = message.data[key];
                    this.values[key] = value;
                    for (j=0; j<this.callbacks.length; j++) {
                        item = this.callbacks[j];
                        if (item && item.event === key + "Change"){
                            item.callback({type: item.event, value: value});
                        }
                    }
                }
            }
        };

        PreziPlayer.prototype.destroy = function() {
            if (this.initPollInterval) {
                clearInterval(this.initPollInterval);
                this.initPollInterval = false;
            }
            this.embedTo.innerHTML = '';
        };

        PreziPlayer.prototype.sendMessage = function(message) {
            if (this.options.debug === true) {
                if (console && console.log) console.log('sent', message);
            }
            message.version = PreziPlayer.API_VERSION;
            message.id = this.id;
            return this.iframe.contentWindow.postMessage(JSON.stringify(message), '*');
        };

        PreziPlayer.prototype.nextStep = /* nextStep is DEPRECATED */
        PreziPlayer.prototype.flyToNextStep = function() {
            return this.sendMessage({
                'action': 'present',
                'data': ['moveToNextStep']
            });
        };

        PreziPlayer.prototype.previousStep = /* previousStep is DEPRECATED */
        PreziPlayer.prototype.flyToPreviousStep = function() {
            return this.sendMessage({
                'action': 'present',
                'data': ['moveToPrevStep']
            });
        };

        PreziPlayer.prototype.toStep = /* toStep is DEPRECATED */
        PreziPlayer.prototype.flyToStep = function(step, animation_step) {
            var obj = this;
            // check animation_step
            if (animation_step > 0 &&
                obj.values.animationCountOnSteps &&
                obj.values.animationCountOnSteps[step] <= animation_step) {
                animation_step = obj.values.animationCountOnSteps[step];
            }
            // jump to animation steps by calling flyToNextStep()
            function doAnimationSteps() {
                if (obj.values.isMoving) {
                    setTimeout(doAnimationSteps, 100); // wait until the flight ends
                    return;
                }
                while (animation_step-- > 0) {
                    obj.flyToNextStep(); // do the animation steps
                }
            }
            setTimeout(doAnimationSteps, 200); // 200ms is the internal "reporting" time
            // jump to the step
            return this.sendMessage({
                'action': 'present',
                'data': ['moveToStep', step]
            });
        };

        PreziPlayer.prototype.toObject = /* toObject is DEPRECATED */
        PreziPlayer.prototype.flyToObject = function(objectId) {
            return this.sendMessage({
                'action': 'present',
                'data': ['moveToObject', objectId]
            });
        };

        PreziPlayer.prototype.play = function(defaultDelay) {
            return this.sendMessage({
                'action': 'present',
                'data': ['startAutoPlay', defaultDelay]
            });
        };

        PreziPlayer.prototype.stop = function() {
            return this.sendMessage({
                'action': 'present',
                'data': ['stopAutoPlay']
            });
        };

        PreziPlayer.prototype.pause = function(defaultDelay) {
            return this.sendMessage({
                'action': 'present',
                'data': ['pauseAutoPlay', defaultDelay]
            });
        };

        PreziPlayer.prototype.getCurrentStep = function() {
            return this.values.currentStep;
        };

        PreziPlayer.prototype.getCurrentAnimationStep = function() {
            return this.values.currentAnimationStep;
        };

        PreziPlayer.prototype.getCurrentObject = function() {
            return this.values.currentObject;
        };

        PreziPlayer.prototype.getStatus = function() {
            return this.values.status;
        };

        PreziPlayer.prototype.isPlaying = function() {
            return this.values.isAutoPlaying;
        };

        PreziPlayer.prototype.getStepCount = function() {
            return this.values.stepCount;
        };

        PreziPlayer.prototype.getAnimationCountOnSteps = function() {
            return this.values.animationCountOnSteps;
        };

        PreziPlayer.prototype.getTitle = function() {
            return this.values.title;
        };

        PreziPlayer.prototype.setDimensions = function(dims) {
            for (var parameter in dims) {
                this.iframe[parameter] = dims[parameter];
            }
        };

        PreziPlayer.prototype.getDimensions = function() {
            return {
                width: parseInt(this.iframe.width, 10),
                height: parseInt(this.iframe.height, 10)
            };
        };

        PreziPlayer.prototype.on = function(event, callback) {
            this.callbacks.push({
                event: event,
                callback: callback
            });
        };

        PreziPlayer.prototype.off = function(event, callback) {
            var j, item;
            if (event === undefined) {
                this.callbacks = [];
            }
            j = this.callbacks.length;
            while (j--) {
                item = this.callbacks[j];
                if (item && item.event === event && (callback === undefined || item.callback === callback)){
                    this.callbacks.splice(j, 1);
                }
            }
        };

        if (window.addEventListener) {
            window.addEventListener('message', PreziPlayer.messageReceived, false);
        } else {
            window.attachEvent('onmessage', PreziPlayer.messageReceived);
        }

        return PreziPlayer;

    })();

})();

module.exports = PreziPlayer;