third_party/polymer/v1_0/components-chromium/paper-icon-button/paper-icon-button-extracted.js

   1 Polymer({
   2     is: 'paper-icon-button',
   3
   4     hostAttributes: {
   5       role: 'button',
   6       tabindex: '0'
   7     },
   8
   9     behaviors: [
  10       Polymer.PaperInkyFocusBehavior
  11     ],
  12
  13     properties: {
  14       /**
  15        * The URL of an image for the icon. If the src property is specified,
  16        * the icon property should not be.
  17        */
  18       src: {
  19         type: String
  20       },
  21
  22       /**
  23        * Specifies the icon name or index in the set of icons available in
  24        * the icon's icon set. If the icon property is specified,
  25        * the src property should not be.
  26        */
  27       icon: {
  28         type: String
  29       },
  30
  31       /**
  32        * Specifies the alternate text for the button, for accessibility.
  33        */
  34       alt: {
  35         type: String,
  36         observer: "_altChanged"
  37       }
  38     },
  39
  40     _altChanged: function(newValue, oldValue) {
  41       var label = this.getAttribute('aria-label');
  42
  43       // Don't stomp over a user-set aria-label.
  44       if (!label || oldValue == label) {
  45         this.setAttribute('aria-label', newValue);
  46       }
  47     }
  48   });