flutter_flutter/tests/layout/custom.sky

<root style="width: 300px">
  <parent style='background-color: lightblue;'>
    <child style='background-color: pink;'>
      <grandchild style='background-color: red; width: 25px; height: 25px;'></grandchild>
    </child>
    <child2 style='background-color: salmon; height: 25px;' />
  </parent>
</root>

<intrinsic-container>
  <intrinsic>
    <intrinsic-child style="width: 10px; height: 10px; background-color: lightblue;" />
  </intrinsic>
</intrinsic-container>

<script>
import "../resources/third_party/unittest/unittest.dart";
import "../resources/unit.dart";

import 'dart:async';
import 'dart:sky';

void main() {
  initUnit();

  test("should have the right sizes after layout", () {
    Completer completer = new Completer();

    var first = true;

    var parent = document.querySelector('parent');
    var firstChild = parent.firstElementChild;
    var secondChild = parent.lastElementChild;
    var grandChild = document.querySelector('grandchild');

    parent.setLayoutManager(() {
      if (first) {
        parent.width = 200.0;
      } else {
        parent.width = 150.0;
      }

      firstChild.width = 100.0;
      firstChild.layout();
      firstChild.x = 100.0;
      firstChild.y = 50.0;
      firstChild.height = 50.0;

      // The second element correctly gets it's width from it's container.
      // TODO(ojan): Change the layout method to take in availableWidth
      // so code doesn't need to mess with setNeedsLayout dirty bits
      // in the middle of layout and so the parent and child don't need
      // to coordinate as much about expectations.
      secondChild.setNeedsLayout();
      secondChild.layout();

      parent.height = 100.0;
    }, () {});

    void assertNonChangingValues() {
      expect(parent.offsetHeight, equals(100));
      expect(parent.offsetTop, equals(0));
      expect(parent.offsetLeft, equals(0));

      expect(firstChild.offsetWidth, equals(100));
      expect(firstChild.offsetHeight, equals(50));
      expect(firstChild.offsetTop, equals(50));
      expect(firstChild.offsetLeft, equals(100));

      expect(secondChild.offsetHeight, equals(25));
      expect(secondChild.offsetTop, equals(0));
      expect(secondChild.offsetLeft, equals(0));

      expect(grandChild.offsetWidth, equals(25));
      expect(grandChild.offsetHeight, equals(25));
      expect(secondChild.offsetTop, equals(0));
      expect(secondChild.offsetLeft, equals(0));
    };

    window.requestAnimationFrame((_) {
      expect(parent.offsetWidth, equals(200));
      expect(secondChild.offsetWidth, equals(200));
      assertNonChangingValues();

      first = false;
      parent.setNeedsLayout();

      window.requestAnimationFrame((_) {
        expect(parent.offsetWidth, equals(150));
        expect(secondChild.offsetWidth, equals(150));
        assertNonChangingValues();

        parent.setLayoutManager(() {
          parent.width = 250.0;
        }, () {});

        window.requestAnimationFrame((_) {
          expect(parent.offsetWidth, equals(250));
          assertNonChangingValues();

          parent.setLayoutManager(null, null);

          window.requestAnimationFrame((_) {
            expect(parent.offsetWidth, equals(300));
            expect(parent.offsetHeight, equals(50));
            expect(parent.offsetTop, equals(0));
            expect(parent.offsetLeft, equals(0));

            expect(firstChild.offsetWidth, equals(300));
            expect(firstChild.offsetHeight, equals(25));
            expect(firstChild.offsetTop, equals(0));
            expect(firstChild.offsetLeft, equals(0));

            expect(secondChild.offsetWidth, equals(300));
            expect(secondChild.offsetHeight, equals(25));
            expect(secondChild.offsetTop, equals(25));
            expect(secondChild.offsetLeft, equals(0));

            expect(grandChild.offsetWidth, equals(25));
            expect(grandChild.offsetHeight, equals(25));
            expect(grandChild.offsetTop, equals(0));
            expect(grandChild.offsetLeft, equals(0));

            completer.complete();
          });
        });
      });
    });

    return completer.future;
  });

  test("intrinsic sizes should apply", () {
    Completer completer = new Completer();

    var intrinsic = document.querySelector('intrinsic');
    var intrinsicChild = document.querySelector('intrinsic-child');

    intrinsic.setLayoutManager(() {
      intrinsicChild.layout();
    }, () {
      intrinsic.minContentWidth = intrinsicChild.minContentWidth + 5;
      intrinsic.maxContentWidth = intrinsicChild.maxContentWidth + 7;
    });

    window.requestAnimationFrame((_) {
      var container = document.querySelector('intrinsic-container');
      container.style['width'] = '-webkit-min-content';
      expect(container.offsetWidth, equals(15));
      container.style['width'] = '-webkit-max-content';
      expect(container.offsetWidth, equals(17));
      completer.complete();
    });

    return completer.future;
  });
}
</script>