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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 Polymer('viewer-page-indicator', { |
| 6 label: '1', |
| 7 index: 0, |
| 8 timerId: undefined, |
| 9 pageLabels: null, |
| 10 ready: function() { |
| 11 var callback = this.fadeIn.bind(this, 2000); |
| 12 window.addEventListener('scroll', function() { |
| 13 requestAnimationFrame(callback); |
| 14 }); |
| 15 }, |
| 16 initialFadeIn: function() { |
| 17 this.fadeIn(6000); |
| 18 }, |
| 19 fadeIn: function(displayTime) { |
| 20 var percent = window.scrollY / |
| 21 (document.body.scrollHeight - |
| 22 document.documentElement.clientHeight); |
| 23 this.style.top = percent * |
| 24 (document.documentElement.clientHeight - this.offsetHeight) + 'px'; |
| 25 this.style.opacity = 1; |
| 26 clearTimeout(this.timerId); |
| 27 |
| 28 this.timerId = setTimeout(function() { |
| 29 this.style.opacity = 0; |
| 30 this.timerId = undefined; |
| 31 }.bind(this), displayTime); |
| 32 }, |
| 33 pageLabelsChanged: function() { |
| 34 this.indexChanged(); |
| 35 }, |
| 36 indexChanged: function() { |
| 37 if (this.pageLabels) |
| 38 this.label = this.pageLabels[this.index]; |
| 39 else |
| 40 this.label = String(this.index + 1); |
| 41 } |
| 42 }); |
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