chrome/browser/resources/pdf/elements/viewer-progress-bar/viewer-progress-bar.js

   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-progress-bar', {
   6   progress: 0,
   7   text: 'Loading',
   8   numSegments: 8,
   9   segments: [],
  10   ready: function() {
  11     this.numSegmentsChanged();
  12   },
  13   progressChanged: function() {
  14     var numVisible = this.progress * this.segments.length / 100.0;
  15     for (var i = 0; i < this.segments.length; i++) {
  16       this.segments[i].style.visibility =
  17           i < numVisible ? 'visible' : 'hidden';
  18     }
  19
  20     if (this.progress >= 100 || this.progress < 0)
  21       this.style.opacity = 0;
  22   },
  23   numSegmentsChanged: function() {
  24     // Clear the existing segments.
  25     this.segments = [];
  26     var segmentsElement = this.$.segments;
  27     segmentsElement.innerHTML = '';
  28
  29     // Create the new segments.
  30     var segment = document.createElement('li');
  31     segment.classList.add('segment');
  32     var angle = 360 / this.numSegments;
  33     for (var i = 0; i < this.numSegments; ++i) {
  34       var segmentCopy = segment.cloneNode(true);
  35       segmentCopy.style.webkitTransform =
  36           'rotate(' + (i * angle) + 'deg) skewY(' +
  37           -1 * (90 - angle) + 'deg)';
  38       segmentsElement.appendChild(segmentCopy);
  39       this.segments.push(segmentCopy);
  40     }
  41     this.progressChanged();
  42   }
  43 });