animationFrame.h5ive.js

/*! animationFrame.h5ive.js | (c) Kyle Simpson | MIT License: http://getify.mit-license.org */

(function(h5){

	if (!h5) throw new Error("animationFrame.h5ive: core.h5ive required.");

	var rAF = (window.requestAnimationFrame || window.msRequestAnimationFrame ||
			window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame ||
			window.oRequestAnimationFrame),
		cAF = (window.cancelAnimationFrame ||
			window.msCancelAnimationFrame || window.msCancelRequestAnimationFrame ||
			window.mozCancelAnimationFrame || window.mozCancelRequestAnimationFrame ||
			window.webkitCancelAnimationFrame || window.webkitCancelRequestAnimationFrame ||
			window.oCancelAnimationFrame || window.oCancelRequestAnimationFrame),
		publicAPI, q_ids = {}
	;

	function qID(){
		var id;
		do {
			id = Math.floor(Math.random() * 1E9);
		} while (id in q_ids);
		return id;
	}

	function queue(cb) {
		var qid = qID();

		q_ids[qid] = rAF(function(){
			delete q_ids[qid];
			cb.apply(publicAPI,arguments);
		});

		return qid;
	}

	function queueAfter(cb) {
		var qid;

		qid = queue(function(){
			// do our own rAF call here because we want to re-use the same `qid` for both frames
			q_ids[qid] = rAF(function(){
				delete q_ids[qid];
				cb.apply(publicAPI,arguments);
			});
		});

		return qid;
	}

	function cancel(qID) {
		if (qID in q_ids) {
			cAF(q_ids[qID]);
			delete q_ids[qID];
		}
		return publicAPI;
	}

	function unsupported() {
		throw new Error("'requestAnimationFrame' not supported.");
	}

	if (rAF && cAF) {
		publicAPI = {
			queue: queue,
			queueAfter: queueAfter,
			cancel: cancel
		};
	}
	else {
		publicAPI = {
			queue: unsupported,
			queueAfter: unsupported,
			cancel: unsupported
		};
	}

	h5.animationFrame = publicAPI;

})(this.h5);