index.js

'use strict';

var throttle = require('lodash.throttle');

if (typeof window !== 'undefined' && typeof document !== 'undefined') {
  var doc = document;
  var badgeParent = doc.body;
  var badgeContainer = doc.createElement('div');
  var badgeInner = doc.createElement('div');
  var badgeLink = doc.createElement('a');
  var badgeStyles = doc.createElement('style');

  badgeContainer.id = 'js-GoogleFontsBadge';
  badgeContainer.className = 'GoogleFontsBadge';

  badgeInner.className = 'GoogleFontsBadge-inner';
  badgeStyles.id = 'js-GoogleFontsBadgeStyles';
  // eslint-disable-next-line max-len
  badgeStyles.innerHTML = '.GoogleFontsBadge { transform: translateY(100%); position: fixed; z-index: 9999; bottom: 0; width: 100%; transition: transform 0.2s; pointer-events: none; } .GoogleFontsBadge__down { transform: translateY(100%) } .GoogleFontsBadge__up { transform: translateY(0) } .GoogleFontsBadge-inner { background: #222; } .GoogleFontsBadge-inner svg { width: 136px; display: block; fill: rgba(255, 255, 255, 0.70); } @media (min-width: 1024px) { .GoogleFontsBadge-inner { background: transparent; } .GoogleFontsBadge-inner svg { fill: rgba(0, 0, 0, 0.54); } .GoogleFontsBadge__down { transform: translateY(0); } }';

  // Link styles need to be unset to avoid cascade issues
  badgeLink.style.unset = 'all';
  badgeLink.style.border = 'none';
  badgeLink.style.background = 'transparent';
  badgeLink.style.padding = '16px 16px 14px 16px';
  badgeLink.style.boxSizing = 'border-box';
  badgeLink.style.margin = '0';
  badgeLink.style.display = 'block';
  badgeLink.style.pointerEvents = 'initial';
  badgeLink.setAttribute('aria-label', 'Project made by Friends of Google Fonts. Follow this link to visit Google Fonts.');

  badgeLink.href = 'https://fonts.google.com';
  // eslint-disable-next-line max-len
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  badgeContainer.appendChild(badgeInner);

  var GoogleFontsBadge = {
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      badgeParent.appendChild(badgeContainer);
      doc.head.appendChild(badgeStyles);

      doc.addEventListener('touchmove', throttle(ScrollStart, 500), false);
      doc.addEventListener('scroll', throttle(Scroll, 500), false);

      function badgeShow() {
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        badgeContainer.classList.add('GoogleFontsBadge__up');
      }

      function badgeHide() {
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        badgeContainer.classList.remove('GoogleFontsBadge__up');
      }

      // Hidden when appended, show if at the top on load
      if (badgeParent.scrollTop === 0) {
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      }

      function ScrollStart() {
        // TODO
        console.log('start, hide');
      }

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          // If scrolled back to top
          badgeShow();
        } else if (badgeParent.scrollTop < scrollValue && ((badgeParent.scrollTop - scrollValue) * -1) > 250) {
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          badgeShow();
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        scrollValue = badgeParent.scrollTop;
      }
    },
    main: function(opts) {
      GoogleFontsBadge.init(opts);
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    remove: function() {
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  };

  var gfBadge = function(opts) {
    GoogleFontsBadge.main.call(opts);
    return GoogleFontsBadge;
  };

  if (typeof module === 'object' && typeof module.exports !== 'undefined') {
    module.exports = gfBadge;
  } else {
    window.gfBadge = gfBadge;
  }
}