chrome/browser/resources/pdf/elements/viewer-toolbar/viewer-toolbar.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({
   6   is: 'viewer-toolbar',
   7
   8   properties: {
   9     fadingIn: {
  10       type: Boolean,
  11       value: false,
  12       observer: 'fadingInChanged'
  13     }
  14   },
  15
  16   timerId_: undefined,
  17
  18   inInitialFadeIn_: false,
  19
  20   ready: function() {
  21     this.mousemoveCallback = function(e) {
  22       var rect = this.getBoundingClientRect();
  23       if (e.clientX >= rect.left && e.clientX <= rect.right &&
  24           e.clientY >= rect.top && e.clientY <= rect.bottom) {
  25         this.fadingIn = true;
  26         // If we hover over the toolbar, cancel the initial fade in.
  27         if (this.inInitialFadeIn_)
  28           this.inInitialFadeIn_ = false;
  29       } else {
  30         // Initially we want to keep the toolbar up for a longer period.
  31         if (!this.inInitialFadeIn_)
  32           this.fadingIn = false;
  33       }
  34     }.bind(this);
  35   },
  36
  37   attached: function() {
  38     this.parentNode.addEventListener('mousemove', this.mousemoveCallback);
  39   },
  40
  41   detached: function() {
  42     this.parentNode.removeEventListener('mousemove', this.mousemoveCallback);
  43   },
  44
  45   initialFadeIn: function() {
  46     this.inInitialFadeIn_ = true;
  47     this.fadeIn();
  48     this.fadeOutAfterDelay(6000);
  49   },
  50
  51   fadingInChanged: function() {
  52     if (this.fadingIn) {
  53       this.fadeIn();
  54     } else {
  55       if (this.timerId_ === undefined)
  56         this.fadeOutAfterDelay(3000);
  57     }
  58   },
  59
  60   fadeIn: function() {
  61     this.style.opacity = 1;
  62     clearTimeout(this.timerId_);
  63     this.timerId_ = undefined;
  64   },
  65
  66   fadeOutAfterDelay: function(delay) {
  67     this.timerId_ = setTimeout(
  68       function() {
  69         this.style.opacity = 0;
  70         this.timerId_ = undefined;
  71         this.inInitialFadeIn_ = false;
  72       }.bind(this), delay);
  73   }
  74 });