iron-dropdown-scroll-manager.html - Android社区

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<html>
<head>
  <meta charset="UTF-8">
  <title>iron-dropdown-scroll-manager tests</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>
  <script src="../../test-fixture/test-fixture-mocha.js"></script>
  <script src="../../iron-test-helpers/mock-interactions.js"></script>

  <link rel="import" href="../iron-dropdown-scroll-manager.html">
  <link rel="import" href="../../test-fixture/test-fixture.html">
  <link rel="import" href="x-scrollable-element.html">
</head>
<body>

  <test-fixture id="DOMSubtree">
    <template>
      <x-scrollable-element id="Parent"></x-scrollable-element>
    </template>
  </test-fixture>
  <script>
    suite('IronDropdownScrollManager', function() {
      var parent;
      var childOne;
      var childTwo;
      var grandchildOne;
      var grandchildTwo;
      var ancestor;

      setup(function() {
        parent = fixture('DOMSubtree');
        childOne = parent.$$('#ChildOne');
        childTwo = parent.$$('#ChildTwo');
        grandChildOne = parent.$$('#GrandchildOne');
        grandChildTwo = parent.$$('#GrandchildTwo');
        ancestor = document.body;
      });

      suite('constraining scroll in the DOM', function() {
        setup(function() {
          Polymer.IronDropdownScrollManager.pushScrollLock(childOne);
        });

        teardown(function() {
          Polymer.IronDropdownScrollManager.removeScrollLock(childOne);
        });

        test('recognizes sibling as locked', function() {
          expect(Polymer.IronDropdownScrollManager.elementIsScrollLocked(childTwo))
            .to.be.equal(true);
        });

        test('recognizes neice as locked', function() {
          expect(Polymer.IronDropdownScrollManager.elementIsScrollLocked(grandChildTwo))
            .to.be.equal(true);
        });

        test('recognizes parent as locked', function() {
          expect(Polymer.IronDropdownScrollManager.elementIsScrollLocked(parent))
            .to.be.equal(true);
        });

        test('recognizes ancestor as locked', function() {
          expect(Polymer.IronDropdownScrollManager.elementIsScrollLocked(ancestor))
            .to.be.equal(true);
        });

        test('recognizes locking child as unlocked', function() {
          expect(Polymer.IronDropdownScrollManager.elementIsScrollLocked(childOne))
            .to.be.equal(false);
        });

        test('recognizes descendant of locking child as unlocked', function() {
          expect(Polymer.IronDropdownScrollManager.elementIsScrollLocked(grandChildOne))
            .to.be.equal(false);
        });

        test('unlocks locked elements when there are no locking elements', function() {
          Polymer.IronDropdownScrollManager.removeScrollLock(childOne);

          expect(Polymer.IronDropdownScrollManager.elementIsScrollLocked(parent))
            .to.be.equal(false);
        });

        test('does not check locked elements when there are no locking elements', function() {
          sinon.spy(Polymer.IronDropdownScrollManager, 'elementIsScrollLocked');
          childOne.dispatchEvent(new CustomEvent('wheel', {
            bubbles: true,
            cancelable: true
          }));
          expect(Polymer.IronDropdownScrollManager
              .elementIsScrollLocked.callCount).to.be.eql(1);
          Polymer.IronDropdownScrollManager.removeScrollLock(childOne);
          childOne.dispatchEvent(new CustomEvent('wheel', {
            bubbles: true,
            cancelable: true
          }));
          expect(Polymer.IronDropdownScrollManager
              .elementIsScrollLocked.callCount).to.be.eql(1);
        });

        suite('various scroll events', function() {
          var scrollEvents;
          var events;

          setup(function() {
            scrollEvents = [
              'wheel',
              'mousewheel',
              'DOMMouseScroll',
              'touchmove'
            ];

            events = scrollEvents.map(function(scrollEvent) {
              return new CustomEvent(scrollEvent, {
                bubbles: true,
                cancelable: true
              });
            });
          });

          test('prevents wheel events from locked elements', function() {
            events.forEach(function(event) {
              childTwo.dispatchEvent(event);
              expect(event.defaultPrevented).to.be.eql(true);
            });
          });

          test('allows wheel events from unlocked elements', function() {
            events.forEach(function(event) {
              childOne.dispatchEvent(event);
              expect(event.defaultPrevented).to.be.eql(false);
            });
          });
        });
      });
    });
  </script>
</body>
</html>