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bigscreen.js
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bigscreen.js
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/*
Copyright (c) 2011 Mark Soper, http://marksoper.net
MIT License
*/
/*
DEPENDENCIES
bigscreen.js requires JQuery
For more information:
http://plugins.jquery.com/project/bigscreen
You need a line like this in your <head>:
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
*/
/* ------------------------------------------------- */
/* TO DEPLOY: ADD SOMETHING LIKE THIS TO YOUR SITE
var SHOW_DIV_ID = "mainShow";
var flickr = new FlickrLoader("json",
"<YOUR FLICKR API KEY>",
"http://api.flickr.com/services/rest/",
"flickr.photos.search",
"<FLICKR USER ID>",
"<TAGS"
);
$(document).ready(function() {
var show = new Show(flickr,SHOW_DIV_ID);
show.start();
});
*/
var DEFAULT_DELAY = 6500;
var FLICKR_PER_PAGE = 10;
var SHOW_DIV_ID = "mainShow";
var INIT_SHOW_HTML = '<img src="http://farm6.static.flickr.com/5258/5480682306_d1eed449f4_b.jpg">';
function Debug() {
this.running = false;
}
Debug.prototype = {
running : false,
initTime : null,
start : function() {
this.running = true;
this.initTime = (new Date).getTime();
$("#bigscreenLog").append(0.00 + " | debug started<br>");
},
log : function(msg) {
$("#bigscreenLog").append((new Date).getTime() - this.initTime + " | " + msg + "<br>");
}
}
var dbug = new Debug();
/* ------------------------------------------------- */
function Photo(originalId,originalSource,originalUrl,originalOwner,originalTitle) {
this.originalId = originalId;
this.originalSource = originalSource;
this.originalUrl = originalUrl;
this.url = originalUrl;
this.originalOwner = originalOwner;
this.originalTitle = originalTitle;
}
Photo.prototype = {
originalId : null,
originalSource : null,
originalUrl : null,
originalOwner : null,
originalTitle : null,
originalNotOrientedWidth : null,
originalNotOrientedHeight : null,
url : null,
imgId : null,
imgHtml : null,
img : null
}
/* ------------------------------------------------- */
function PhotoLoader() {
}
PhotoLoader.prototype = {
}
function FlickrLoader(url, params) {
PhotoLoader.call(this);
this.url = url;
this.page = 1;
this.params = params;
if (!('per_page' in this.params)) {
this.params['per_page'] = Math.min(Math.floor(Math.random()+0.5)*FLICKR_PER_PAGE,490);
}
this.params['extras'] = "o_dims";
}
FlickrLoader.prototype = {
url : null,
page : null,
params : {},
buildUrl : function(flickr_photo) {
return "http://farm" + flickr_photo.farm + ".static.flickr.com/" + flickr_photo.server + "/" + flickr_photo.id + "_" + flickr_photo.secret + "_b_d.jpg";
},
buildPhoto : function(flickr_photo) {
var photo = new Photo(flickr_photo.id,"Flickr",this.buildUrl(flickr_photo),flickr_photo.owner);
photo.originalNotOrientedWidth = flickr_photo.o_width;
photo.originalNotOrientedHeight = flickr_photo.o_height;
return photo;
},
get : function(show,callback) {
if (window.debug) {
dbug.log("request data from " + this.url + this.params);
}
this.params["page"] = this.page;
this.page++;
thisloader = this;
$.get(this.url, this.params,
function(data) {
if (window.debug) {
dbug.log("receive data from " + this.url + this.params);
}
thisloader.data = data.replace(/^jsonFlickrApi\(/,'').replace(/\)$/,'');
thisloader.res = jQuery.parseJSON(thisloader.data);
thisloader.flickr_photos = thisloader.res.photos.photo;
thisloader.photos = [];
for (var i = 0; i < thisloader.flickr_photos.length; i++) {
thisloader.photos.push(thisloader.buildPhoto(thisloader.flickr_photos[i]));
}
if (window.debug) {
dbug.log(thisloader.photos.length + " Photos made from " + this.url + this.params);
}
callback.call(show);
});
}
}
/* ------------------------------------------------- */
function Screen(id,photos) {
this.id = id;
this.photos = photos;
this.content = null;
}
Screen.prototype = {
id : null,
photos : null,
content : null
}
/* ------------------------------------------------- */
function Show(loader,divId,debugFlag) {
this.loader = loader;
this.divId = divId;
this.div = $("#"+this.divId);
this.height = this.div.css("height");
this.width = this.div.css("width");
this.index = 0;
this.photoIndex = 0;
this.screenSequence = 0;
this.screens = [];
this.photos = [];
this.prepared = false;
this.running = false;
this.debug = debugFlag;
this.initFetchRequested = false;
this.initFetchReturned = false;
window.debug = this.debug;
if (window.debug) {
dbug.start();
}
/* this.initPage(); */
/*this.fitToWindow(); */
}
Show.prototype = {
loader : null,
divId : null,
div : null,
index : null,
photoIndex : null,
screenSequence : null,
photos : null,
screens : null,
prepared : false,
running : false,
debug : false,
initFetchRequested : false,
initFetchReturned : false,
prepare : function() {
if (window.debug) {
dbug.log("Show.prepare()");
}
this.prepared = true;
},
fetchPhotos : function() {
this.loader.get(this,this.onboardPhotos);
this.initFetchRequested = true;
},
onboardPhotos : function() { /* callback from the loader upon getting data */
this.initFetchReturned = true;
shuffled_photos = shufflePhotos(this.loader.photos);
this.photos.push.apply(this.photos,shuffled_photos);
dbug.log("onboarding " + this.photos.length + " photos into " + this.photos.length + " screens");
this.insertScreens(this.photos);
},
insertScreens : function() {
for (var i = 0; i < this.photos.length; i++) {
var screen = this.makeScreen(this.photos[i]);
this.photoIndex++;
this.insertScreen(screen,false);
}
},
makeScreen : function(photo) {
var screen = new Screen(this.screenSequence, [photo]);
screen.content = '<div class="screenDiv hidden" id="screenDiv' + screen.id + '" ><img class="screenImg" id="screenImg' + screen.id + '" src="' + screen.photos[0].url + '" /></div>';
return screen;
},
insertScreen : function(screen) {
if (window.debug) {
dbug.log("insertScreen() screen" + screen.id + " | " + screen.photos[0].url.substring(0,20));
}
if (this.screenSequence == 0) {
this.div.html(screen.content);
} else {
this.div.append(screen.content);
}
this.screenSequence++;
this.screens.push(screen);
if (this.screenSequence == 1) { /* hook to handle the initial page load case */
this.displayScreen(0);
this.index++;
if (window.debug) {
dbug.log("Show.insertScreen() displaying initial screen" + screen.id + " | " + screen.photos[0].url.substring(0,20));
}
}
},
start : function() {
if (!(this.running)) {
if (!(this.prepared)) {
this.prepare();
}
if (window.debug) {
dbug.log("Show.start()")
}
this.running = true;
this.advance();
}
},
stop : function() {
if (this.running) {
this.running = false;
}
},
reset : function() {
this.photos = [];
this.screens = [];
this.div.html('');
},
displayScreen : function(index) {
screenDiv = $("#screenDiv"+index);
$(".screenDiv").addClass("hidden").removeClass("visible");
$(screenDiv).addClass("visible").removeClass("hidden");
if (window.debug) {
dbug.log("Show.displayScreen() displaying screenDiv" + $(screenDiv).attr("id") );
}
},
advance : function() {
if (!(this.initFetchRequested)) { /* initial page load */
this.fetchPhotos();
} else {
if (this.index <= this.screenSequence) {
if ( (this.index >= this.screenSequence - 3) && (this.initFetchReturned) ) {
this.fetchPhotos();
}
this.displayScreen(this.index);
this.index++;
} else {
this.fetchPhotos();
}
}
var thisshow = this;
timer = setTimeout(function() {
if (thisshow.running) {
thisshow.advance();
}
}, DEFAULT_DELAY);
}
}
/* ------------------------------------------------- */
function extend(child, supertype) {
child.prototype.__proto__ = supertype.prototype;
}
extend(FlickrLoader, PhotoLoader);
function shufflePhotos(photos) {
var i = photos.length;
if ( i == 0 ) return false;
while ( --i ) {
var j = Math.floor( Math.random() * ( i + 1 ) );
var tempi = photos[i];
var tempj = photos[j];
photos[i] = tempj;
photos[j] = tempi;
}
return photos;
}