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embedded-media.html
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embedded-media.html
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<!--script src="../javascript-detect-element-resize/javascript-detect-element-resize.js"></script-->
<script src="../css-element-queries/src/ResizeSensor.js"></script>
<script src="../screenfull/dist/screenfull.min.js"></script>
<!-- script src="../ResizeSensor/ResizeSensorApi.js"></script -->
<dom-module id="embedded-media">
<style>
</style>
size [[width]] [[height]]
<template><content></content></template>
</dom-module>
<script>
(function () {
// since there's no magic way to talk to an iframe, the client-side way is to simply know which sites' embeds should not be scaled. Can be a domain name or a specific script
var NOSCALING = ['www.facebook.com', 'platform.twitter.com'];
function wontScale(url) {
return NOSCALING.filter(function(knownUrl) { return new RegExp("^(https?:\/\/)?" + knownUrl).test(url) }).length;
}
Polymer({
is : 'embedded-media',
properties : {
width : {
value : 0,
//observer : 'widthChanged',
//notify : true
},
height : {
value : 0,
//observer : 'widthChanged'
//notify : true
}
},
created : function() {
},
ready : function() {
},
attached : function() {
this.sizeFromContainer();
ResizeSensor(Polymer.dom(this).parentNode, this.sizeFromContainer.bind(this));
window.addEventListener('resize', this.sizeFromContainer.bind(this));
},
sizeFromContainer : function() {
this.debounce('resizeMedia', this._sizeFromContainer, 50);
},
_sizeFromContainer : function(iframeLoaded) {
var p = Polymer.dom(this).parentNode,
content = Polymer.dom(this).firstChild,
w, h, avw;
if(!content || !content.tagName || !p || screenfull.isFullscreen) // screenfull.js polyfill is imported at the top of this file
return;
this.content = content;
if(content.tagName == 'IFRAME' && content.src && !wontScale(content.src))
{
if(!this.ratio) {
this.original = {};
this.original.width = content.width;
this.original.height = content.height;
this.ratio = calculateRatio(this.original.width, this.original.height);
}
avw = this.availableWidth();
w = avw;
h = Math.round(w * this.ratio);
console.log("ratio", this.ratio)
console.log("w:", w, "ow:", this.original.width, "w/w", w/this.original.width)
console.log("h:", h, "oh:", this.original.height, "h/h", h/this.original.height)
content.style.width = (content.width = w) + "px";
content.style.height = (content.height = h) + "px";
console.log(content.style.width, content.style.height);
console.log(content.width, content.height);
if(w != this.width || h != this.height) {
this.set('width', w)
this.set('height', h)
content.src += ''; // there's no way for us to know the iframe content will reflow itself.
// could be specified per service (eg youtube works it out but idnes.cz doesn't)
}
}
},
widthChanged : function() {
if(!this.resizedBefore)
return this.resizedBefore = true;
this.debounce('refresh', function() {
var p, cl;
p = Polymer.dom(this).parentNode;
if(!p)
return;
p = Polymer.dom(p);
cl = Polymer.dom(this).cloneNode(true);
p.insertBefore(cl, this);
Polymer.dom.flush();
p.removeChild(this);
Polymer.dom.flush();
}, 100);
},
availableWidth : function() {
var p, bcr, m;
p = Polymer.dom(this).parentNode;
if(!p)
return;
bcr = p.getBoundingClientRect();
m = p.offsetWidth;
do {
m = Math.min(p.offsetWidth, m);
p = Polymer.dom(p).parentNode;
} while(p && p != document);
return m;
}
});
function calculateRatio(w, h){
return Math.round((h * 100000) / (w)) / 100000;
}
})();
</script>