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bower_components/iron-list/test/dynamic-item-size.html 3.25 KB
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  <!doctype html>
  <!--
  @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
  -->
  <html>
  <head>
    <meta charset="UTF-8">
    <title>iron-list test</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">
  
    <script src="../../webcomponentsjs/webcomponents-lite.js"></script>
    <script src="../../web-component-tester/browser.js"></script>
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    <script src="../../iron-test-helpers/mock-interactions.js"></script>
  
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    <link rel="import" href="helpers.html">
    <link rel="import" href="x-list.html">
  
  </head>
  <body>
  
    <test-fixture id="trivialList">
      <template>
        <x-list item-height="0" pre></x-list>
      </template>
    </test-fixture>
  
    <script>
  
      suite('Dynamic item size', function() {
        var list, container;
  
        setup(function() {
          container = fixture('trivialList');
          list = container.list;
        });
  
        test('update size using item index', function(done) {
          list.items = buildDataSet(100);
  
          flush(function() {
            var firstItem = getFirstItemFromList(list);
            var initHeight = firstItem.offsetHeight;
  
            list.set('items.0.index', '1\n2\n3\n4');
            list.updateSizeForItem(0);
            assert.isAbove(firstItem.offsetHeight, initHeight*3);
  
            list.set('items.0.index', '1');
            list.updateSizeForItem(0);
            assert.equal(firstItem.offsetHeight, initHeight);
  
            done();
          });
        });
  
        test('update size using item object', function(done) {
          list.items = buildDataSet(100);
  
          flush(function() {
            var firstItem = getFirstItemFromList(list);
            var initHeight = firstItem.offsetHeight;
  
            list.set('items.0.index', '1\n2\n3\n4');
            list.updateSizeForItem(list.items[0]);
            assert.isAbove(firstItem.offsetHeight, initHeight*3);
  
            list.set('items.0.index', '1');
            list.updateSizeForItem(list.items[0]);
            assert.equal(firstItem.offsetHeight, initHeight);
  
            done();
          });
        });
  
        test('ignore items that are not rendered', function(done) {
          list.items = buildDataSet(100);
  
          flush(function() {
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            list.updateSizeForItem(list.items[list.items.length - 1]);
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            done();
          });
        });
  
  
        test('throw if the item is invalid', function(done) {
          list.items = buildDataSet(100);
  
          flush(function() {
            var firstItem = getFirstItemFromList(list);
            var initHeight = firstItem.offsetHeight;
            var throws = 0;
  
            try {
              list.updateSizeForItem(100);
            } catch (error) {
              throws++;
            }
  
            try {
              list.updateSizeForItem({});
            } catch (error) {
              throws++;
            }
  
            assert.equal(throws, 2);
            done();
          });
        });
  
      });
  
    </script>
  
  </body>
  </html>