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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
Polymer('viewer-page-indicator', {
label: '1',
index: 0,
timerId: undefined,
pageLabels: null,
ready: function() {
var callback = this.fadeIn.bind(this, 2000);
window.addEventListener('scroll', function() {
requestAnimationFrame(callback);
});
},
initialFadeIn: function() {
this.fadeIn(6000);
},
fadeIn: function(displayTime) {
var percent = window.scrollY /
(document.body.scrollHeight -
document.documentElement.clientHeight);
this.style.top = percent *
(document.documentElement.clientHeight - this.offsetHeight) + 'px';
this.style.opacity = 1;
clearTimeout(this.timerId);
this.timerId = setTimeout(function() {
this.style.opacity = 0;
this.timerId = undefined;
}.bind(this), displayTime);
},
pageLabelsChanged: function() {
this.indexChanged();
},
indexChanged: function() {
if (this.pageLabels)
this.label = this.pageLabels[this.index];
else
this.label = String(this.index + 1);
}
});
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