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slideshow.js
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slideshow.js
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var Navigation = require('./slideshow/navigation')
, Events = require('./slideshow/events')
, utils = require('../utils')
, Slide = require('./slide')
, Parser = require('../parser')
, macros = require('../macros')
;
module.exports = Slideshow;
function Slideshow (events, dom, options, callback) {
var self = this
, slides = []
, links = {}
;
slides.byName = {};
options = options || {};
// Extend slideshow functionality
Events.call(self, events);
Navigation.call(self, events);
self.loadFromString = loadFromString;
self.loadFromUrl = loadFromUrl;
self.update = update;
self.getLinks = getLinks;
self.getSlides = getSlides;
self.getSlideCount = getSlideCount;
self.getSlideByName = getSlideByName;
self.getSlidesByNumber = getSlidesByNumber;
self.togglePresenterMode = togglePresenterMode;
self.toggleHelp = toggleHelp;
self.toggleBlackout = toggleBlackout;
self.toggleMirrored = toggleMirrored;
self.toggleFullscreen = toggleFullscreen;
self.createClone = createClone;
self.resetTimer = resetTimer;
self.getRatio = getOrDefault('ratio', '4:3');
self.getHighlightStyle = getOrDefault('highlightStyle', 'default');
self.getHighlightLines = getOrDefault('highlightLines', false);
self.getHighlightSpans = getOrDefault('highlightSpans', false);
self.getHighlightInlineCode = getOrDefault('highlightInlineCode', false);
self.getHighlightLanguage = getOrDefault('highlightLanguage', '');
self.getSlideNumberFormat = getOrDefault('slideNumberFormat', '%current% / %total%');
self.getCloneTarget = getOrDefault('cloneTarget', '_blank');
events.on('toggleBlackout', function (opts) {
if (opts && opts.propagate === false) return;
if (self.clone && !self.clone.closed) {
self.clone.postMessage('toggleBlackout', '*');
}
if (window.opener) {
window.opener.postMessage('toggleBlackout', '*');
}
});
if (options.sourceUrl) {
loadFromUrl(options.sourceUrl, callback);
}
else {
loadFromString(options.source);
if (typeof callback === 'function') {
callback(self);
}
}
function loadFromString (source) {
source = source || '';
slides = createSlides(source, options);
expandVariables(slides);
links = {};
slides.forEach(function (slide) {
for (var id in slide.links) {
if (slide.links.hasOwnProperty(id)) {
links[id] = slide.links[id];
}
}
});
events.emit('slidesChanged');
}
function loadFromUrl (url, callback) {
var xhr = new dom.XMLHttpRequest();
xhr.open('GET', options.sourceUrl, true);
xhr.onload = function (e) {
if (xhr.readyState === 4) {
if (xhr.status === 200) {
options.source = xhr.responseText.replace(/\r\n/g, '\n');
loadFromString(options.source);
if (typeof callback === 'function') {
callback(self);
}
} else {
throw Error(xhr.statusText);
}
}
};
xhr.onerror = function (e) {
throw Error(xhr.statusText);
};
xhr.send(null);
return xhr;
}
function update () {
events.emit('resize');
}
function getLinks () {
return links;
}
function getSlides () {
return slides.map(function (slide) { return slide; });
}
function getSlideCount () {
return slides.length;
}
function getSlideByName (name) {
return slides.byName[name];
}
function getSlidesByNumber (number) {
return slides.byNumber[number];
}
function togglePresenterMode () {
events.emit('togglePresenterMode');
}
function toggleHelp () {
events.emit('toggleHelp');
}
function toggleBlackout () {
events.emit('toggleBlackout');
}
function toggleMirrored() {
events.emit('toggleMirrored');
}
function toggleFullscreen () {
events.emit('toggleFullscreen');
}
function createClone () {
events.emit('createClone');
}
function resetTimer () {
events.emit('resetTimer');
}
function getOrDefault (key, defaultValue) {
return function () {
if (options[key] === undefined) {
return defaultValue;
}
return options[key];
};
}
}
function createSlides (slideshowSource, options) {
var parser = new Parser()
, parsedSlides = parser.parse(slideshowSource, macros, options)
, slides = []
, byName = {}
, layoutSlide
;
slides.byName = {};
slides.byNumber = {};
var slideNumber = 0;
parsedSlides.forEach(function (slide, i) {
var template, slideViewModel;
if (slide.properties.continued === 'true' && i > 0) {
template = slides[slides.length - 1];
}
else if (byName[slide.properties.template]) {
template = byName[slide.properties.template];
}
else if (slide.properties.layout === 'false') {
layoutSlide = undefined;
}
else if (layoutSlide && slide.properties.layout !== 'true') {
template = layoutSlide;
}
if (slide.properties.continued === 'true' &&
options.countIncrementalSlides === false &&
slide.properties.count === undefined) {
slide.properties.count = 'false';
}
var slideClasses = (slide.properties['class'] || '').split(/,| /)
, excludedClasses = options.excludedClasses || []
, slideIsIncluded = slideClasses.filter(function (c) {
return excludedClasses.indexOf(c) !== -1;
}).length === 0;
if (slideIsIncluded && slide.properties.layout !== 'true' && slide.properties.count !== 'false') {
slideNumber++;
slides.byNumber[slideNumber] = [];
}
if (options.includePresenterNotes !== undefined && !options.includePresenterNotes) {
slide.notes = '';
}
slideViewModel = new Slide(slides.length, slideNumber, slide, template, options);
if (slide.properties.name) {
byName[slide.properties.name] = slideViewModel;
}
if (slide.properties.layout === 'true') {
layoutSlide = slideViewModel;
} else {
if (slideIsIncluded) {
slides.push(slideViewModel);
if (slides.byNumber[slideNumber] !== undefined) {
slides.byNumber[slideNumber].push(slideViewModel);
}
}
if (slide.properties.name) {
slides.byName[slide.properties.name] = slideViewModel;
}
}
});
return slides;
}
function expandVariables (slides) {
slides.forEach(function (slide) {
slide.expandVariables();
});
}