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job.js
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job.js
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/*
* Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
* This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
* The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
* The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
* Code distributed by Google as part of the polymer project is also
* subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
*/
(function(scope) {
// usage
// invoke cb.call(this) in 100ms, unless the job is re-registered,
// which resets the timer
//
// this.myJob = this.job(this.myJob, cb, 100)
//
// returns a job handle which can be used to re-register a job
var Job = function(inContext) {
this.context = inContext;
this.boundComplete = this.complete.bind(this)
};
Job.prototype = {
go: function(callback, wait) {
this.callback = callback;
var h;
if (!wait) {
h = requestAnimationFrame(this.boundComplete);
this.handle = function() {
cancelAnimationFrame(h);
}
} else {
h = setTimeout(this.boundComplete, wait);
this.handle = function() {
clearTimeout(h);
}
}
},
stop: function() {
if (this.handle) {
this.handle();
this.handle = null;
}
},
complete: function() {
if (this.handle) {
this.stop();
this.callback.call(this.context);
}
}
};
function job(job, callback, wait) {
if (job) {
job.stop();
} else {
job = new Job(this);
}
job.go(callback, wait);
return job;
}
// exports
scope.job = job;
})(Polymer);