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bower_components/iron-list/test/helpers.html 2.19 KB
e619a3b0   Luigi Serra   Controllet cross ...
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  <!--
  @license
  Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
  This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE
  The complete set of authors may be found at http://polymer.github.io/AUTHORS
  The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS
  Code distributed by Google as part of the polymer project is also
  subject to an additional IP rights grant found at http://polymer.github.io/PATENTS
  -->
  
  <script>
    function findElementInList(container, selector) {
      var i = 0;
      var children = container._children;
      var ms = Polymer.DomApi.matchesSelector;
  
      for (; i < children.length; i++) {
        if (children[i].nodeType === Node.ELEMENT_NODE && ms.call(children[i], selector)) {
          return children[i];
        }
      }
      return null;
    }
  
    function buildItem(index) {
      return {
        index: index
      };
    }
  
    function buildDataSet(size) {
      var data = [];
      while (data.length < size) {
        data.push(buildItem(data.length));
      }
      return data;
    }
  
    function simulateScroll(config, fn) {
      var list = config.list;
      var target = config.target;
      var delay = config.delay || 1;
      var contribution = config.contribution || 10;
  
      function scroll(dir, prevVal) {
        if ((dir > 0 && list.scrollTop >= target) || 
            (dir < 0 && list.scrollTop <= target) || 
            list.scrollTop === prevVal
          ){
          list.scrollTop = target;
          setTimeout(fn.bind(null, list.scrollTop), 100);
          return;
        }
        prevVal = list.scrollTop;
        list.scrollTop = list.scrollTop + dir;
        setTimeout(scroll.bind(null, dir, prevVal), delay);
      }
  
      if (list.scrollTop < target) {
        scroll(Math.abs(contribution), -1);
      } else if (list.scrollTop > target) {
        scroll(-Math.abs(contribution), -1);
      }
    }
  
    function getFirstItemFromList(list) {
      var listRect = list.getBoundingClientRect();
      return document.elementFromPoint(listRect.left + 1, listRect.top + 1);
    }
  
    function getLastItemFromList(list) {
      var listRect = list.getBoundingClientRect();
      return document.elementFromPoint(listRect.left + 1, listRect.top + listRect.height - 1);
    }
  </script>