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snowstack_delayed_load.html
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<!DOCTYPE html>
<html>
<head>
<!--
Copyright (C) 2009 Charles Ying. All Rights Reserved.
This source code is available under Apache License 2.0.
Performance Notes (courtesy of Apple):
on leopard, if animating transforms with a transform list > 1 function, animation falls back to software
shadows (and animated shadows) plus border animations can cause additional redraws
(not fixed) css selectors are expensive
-->
<title>Snow Stack - WebKit 3D CSS Visual Effects</title>
<meta name="Description" content="Snow Stack is a demo of WebKit CSS 3D visual effects with latest WebKit nightly on Mac OS X Snow Leopard" />
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<style type="text/css">
body
{
background-color: black;
color: white;
margin: 0;
padding: 0;
}
.view
{
position: absolute;
display: block;
-webkit-transform-style: preserve-3d;
}
.viewflat
{
position: absolute;
display: block;
-webkit-transform-style: preserve-3d;
}
.fader
{
-webkit-transition-property: opacity;
-webkit-transition-duration: 550ms;
-webkit-transition-timing-function: ease-in-out;
}
.page
{
-webkit-perspective: 600;
width: 100%;
height: 100%;
margin: 0 auto;
text-align: center;
}
div.origin
{
left: 50%;
top: 50%;
}
div#camera
{
-webkit-transition-property: -webkit-transform;
-webkit-transition-duration: 5s;
-webkit-transition-timing-function: cubic-bezier(0.2, 0.6, 0.6, 0.9);
-webkit-transform: translate3d(0, 0, 0);
}
div#dolly
{
-webkit-transition-property: -webkit-transform;
-webkit-transition-duration: 550ms;
-webkit-transition-timing-function: ease-out;
-webkit-transform: translate3d(0, 0, 0);
}
div.cell.reflection img
{
-webkit-mask-image: -webkit-gradient(linear, left top, left bottom, color-stop(0.25, transparent), color-stop(1.0, rgba(255, 255, 255, 0.5)));
}
div.cell
{
-webkit-transition-property: -webkit-transform opacity;
-webkit-transition-duration: 550ms;
-webkit-transform: translate3d(0, 0, 0);
}
div.cell img
{
display: block;
position: absolute;
-webkit-transition-property: -webkit-transform /* PERF -webkit-box-shadow */ /* border-color */;
-webkit-transition-duration: 550ms;
-webkit-transform: translate3d(0, 0, 0);
}
div.original img
{
border: 1px solid transparent;
}
div.original.selected img
{
/* PERF
-webkit-box-shadow: 0px 0px 35px #000;
*/
border-color: #000;
}
.mover
{
-webkit-transition-property: -webkit-transform;
-webkit-transition-duration: 550ms;
}
div.original.selected .mover
{
-webkit-transform: translate3d(0, 0, 40px);
}
div.original.selected.magnify .mover
{
-webkit-transform: translate3d(0, 0, 100px);
}
div.original.selected.magnify img
{
-webkit-transform: scale(2.0);
}
div.reflection.selected .mover
{
-webkit-transform: translate3d(0, 0, 39px);
}
</style>
</head>
<body>
<div class="page view">
<div class="origin view">
<div id="camera" class="view">
<div id="dolly" class="view">
<div id="stack" class="view">
</div>
<div id="mirror" class="view">
<div id="rstack" class="view">
</div>
</div>
</div>
</div>
</div>
</div>
<script type="text/javascript">
var CWIDTH;
var CHEIGHT;
var CGAP = 10;
var CXSPACING;
var CYSPACING;
function translate3d(x, y, z)
{
return "translate3d(" + x + "px, " + y + "px, " + z + "px)";
}
function cameraTransformForCell(n)
{
var x = Math.floor(n / 3);
var y = n - x * 3;
var cx = (x + 0.5) * CXSPACING;
var cy = (y + 0.5) * CYSPACING;
if (magnifyMode)
{
return translate3d(-cx, -cy, 180);
}
else
{
return translate3d(-cx, -cy, 0);
}
}
var currentCell = -1;
var cells = [];
var currentTimer = null;
var dolly = jQuery("#dolly")[0];
var camera = jQuery("#camera")[0];
var magnifyMode = false;
var zoomTimer = null;
function refreshImage(elem, cell)
{
if (cell.iszoomed)
{
return;
}
if (zoomTimer)
{
clearTimeout(zoomTimer);
}
var zoomImage = jQuery('<img class="zoom"></img>');
zoomTimer = setTimeout(function ()
{
zoomImage.load(function ()
{
layoutImageInCell(zoomImage[0], cell.div[0]);
elem.parentNode.replaceChild(zoomImage[0], elem);
cell.iszoomed = true;
});
zoomImage[0].src = cell.info.zoom;
zoomTimer = null;
}, 2000);
}
function layoutImageInCell(image, cell)
{
var iwidth = image.width;
var iheight = image.height;
var cwidth = CWIDTH;
var cheight = CHEIGHT;
var ratio = Math.min(cheight / iheight, cwidth / iwidth);
iwidth *= ratio;
iheight *= ratio;
image.style.width = Math.round(iwidth) + "px";
image.style.height = Math.round(iheight) + "px";
image.style.left = Math.round((cwidth - iwidth) / 2) + "px";
image.style.top = Math.round((cheight - iheight) / 2) + "px";
}
function updateStack(newIndex, newmagnifymode)
{
if (currentCell == newIndex && magnifyMode == newmagnifymode)
{
return;
}
var oldIndex = currentCell;
newIndex = Math.min(Math.max(newIndex, 0), cells.length - 1);
currentCell = newIndex;
if (oldIndex != -1)
{
var oldCell = cells[oldIndex];
oldCell.div.attr("class", "cell fader view original");
if (oldCell.reflection)
{
oldCell.reflection.attr("class", "cell fader view reflection");
}
}
var cell = cells[newIndex];
cell.div.addClass("selected");
if (cell.reflection)
{
cell.reflection.addClass("selected");
}
magnifyMode = newmagnifymode;
if (magnifyMode)
{
cell.div.addClass("magnify");
refreshImage(cell.div.find("img")[0], cell);
}
dolly.style.webkitTransform = cameraTransformForCell(newIndex);
var currentMatrix = new WebKitCSSMatrix(document.defaultView.getComputedStyle(dolly, null).webkitTransform);
var targetMatrix = new WebKitCSSMatrix(dolly.style.webkitTransform);
var dx = currentMatrix.e - targetMatrix.e;
var angle = Math.min(Math.max(dx / (CXSPACING * 3.0), -1), 1) * 45;
camera.style.webkitTransform = "rotateY(" + angle + "deg)";
camera.style.webkitTransitionDuration = "330ms";
if (currentTimer)
{
clearTimeout(currentTimer);
}
currentTimer = setTimeout(function ()
{
camera.style.webkitTransform = "rotateY(0)";
camera.style.webkitTransitionDuration = "5s";
}, 330);
}
function snowstack_addimage(reln, info)
{
var cell = {};
var realn = cells.length;
cells.push(cell);
var x = Math.floor(realn / 3);
var y = realn - x * 3;
cell.info = info;
cell.div = jQuery('<div class="cell fader view original" style="opacity: 0; width: ' + CWIDTH + 'px; height: ' + CHEIGHT + 'px"></div>');
cell.div[0].style.webkitTransform = translate3d(x * CXSPACING, y * CYSPACING, 0);
var img = document.createElement("img");
jQuery(img).load(function ()
{
layoutImageInCell(img, cell.div[0]);
cell.div.append(jQuery('<a class="mover viewflat" href="' + cell.info.link + '" target="_blank"></a>').append(img));
cell.div.css("opacity", 1);
});
img.src = info.thumb;
jQuery("#stack").append(cell.div);
if (y == 2)
{
cell.reflection = jQuery('<div class="cell fader view reflection" style="opacity: 0; width: ' + CWIDTH + 'px; height: ' + CHEIGHT + 'px"></div>');
cell.reflection[0].style.webkitTransform = translate3d(x * CXSPACING, y * CYSPACING, 0);
var rimg = document.createElement("img");
jQuery(rimg).load(function ()
{
layoutImageInCell(rimg, cell.reflection[0]);
cell.reflection.append(jQuery('<div class="mover viewflat"></div>').append(rimg));
cell.reflection.css("opacity", 1);
});
rimg.src = info.thumb;
jQuery("#rstack").append(cell.reflection);
}
}
function snowstack_init()
{
CHEIGHT = Math.round(window.innerHeight / 5);
CWIDTH = Math.round(CHEIGHT * 300 / 180);
CXSPACING = CWIDTH + CGAP;
CYSPACING = CHEIGHT + CGAP;
jQuery("#mirror")[0].style.webkitTransform = "scaleY(-1.0) " + translate3d(0, - CYSPACING * 6 - 1, 0);
}
function delayed_add(images)
{
var i = 0;
var nextload = function ()
{
setTimeout(function ()
{
if (i < images.length)
{
snowstack_addimage(0, images[i]);
i += 1;
nextload();
}
}, 500);
}
nextload();
}
jQuery(window).load(function ()
{
var page = 1;
var loading = true;
snowstack_init();
flickr(function (images)
{
jQuery.each(images, snowstack_addimage);
updateStack(1);
loading = false;
}, page);
var keys = { left: false, right: false, up: false, down: false };
var keymap = { 37: "left", 38: "up", 39: "right", 40: "down" };
var keytimer = null;
function updatekeys()
{
var newcell = currentCell;
if (keys.left)
{
/* Left Arrow */
if (newcell >= 3)
{
newcell -= 3;
}
}
if (keys.right)
{
/* Right Arrow */
if ((newcell + 3) < cells.length)
{
newcell += 3;
}
else if (!loading)
{
/* We hit the right wall, add some more */
page = page + 1;
loading = true;
flickr(function (images)
{
delayed_add(images);
// jQuery.each(images, snowstack_addimage);
loading = false;
}, page);
}
}
if (keys.up)
{
/* Up Arrow */
newcell -= 1;
}
if (keys.down)
{
/* Down Arrow */
newcell += 1;
}
updateStack(newcell, magnifyMode);
}
var delay = 330;
function keycheck()
{
if (keys.left || keys.right || keys.up || keys.down)
{
if (keytimer === null)
{
delay = 330;
var doTimer = function ()
{
updatekeys();
keytimer = setTimeout(doTimer, delay);
delay = 60;
};
doTimer();
}
}
else
{
clearTimeout(keytimer);
keytimer = null;
}
}
/* Limited keyboard support for now */
window.addEventListener('keydown', function (e)
{
if (e.keyCode == 32)
{
/* Magnify toggle with spacebar */
updateStack(currentCell, !magnifyMode);
}
else
{
keys[keymap[e.keyCode]] = true;
}
keycheck();
});
window.addEventListener('keyup', function (e)
{
keys[keymap[e.keyCode]] = false;
keycheck();
});
});
function flickr(callback, page)
{
var url = "http://api.flickr.com/services/rest/?method=flickr.interestingness.getList&api_key=60746a125b4a901f2dbb6fc902d9a716&per_page=21&extras=url_o,url_m,url_s&page=" + page + "&format=json&jsoncallback=?";
jQuery.getJSON(url, function(data)
{
var images = jQuery.map(data.photos.photo, function (item)
{
return {
thumb: item.url_s,
zoom: 'http://farm' + item.farm + '.static.flickr.com/' + item.server + '/' + item.id + '_' + item.secret + '.jpg',
link: 'http://www.flickr.com/photos/' + item.owner + '/' + item.id
};
});
callback(images);
});
}
</script>
<script type="text/javascript">
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
</script>
<script type="text/javascript">
try {
var pageTracker = _gat._getTracker("UA-69710-1");
pageTracker._initData();
pageTracker._trackPageview();
} catch(err) {}</script>
</body>
</html>