import 'package:sky/widgets.dart';
import 'package:test/test.dart';

import '../engine/mock_events.dart';
import 'widget_tester.dart';

final Key blockKey = new Key('test');

void main() {
  test('Cannot scroll a non-overflowing block', () {
    WidgetTester tester = new WidgetTester();

    tester.pumpFrame(() {
      return new Block([
        new Container(
          height: 200.0, // less than 600, the height of the test area
          child: new Text('Hello')
        )
      ],
      key: blockKey);
    });
    tester.pumpFrameWithoutChange(); // for SizeObservers

    Point middleOfContainer = tester.getCenter(tester.findText('Hello'));
    Point target = tester.getCenter(tester.findWidget((widget) => widget.key == blockKey));
    TestPointer pointer = new TestPointer();
    tester.dispatchEvent(pointer.down(target), target);
    tester.dispatchEvent(pointer.move(target + const Offset(0.0, -10.0)), target);

    tester.pumpFrameWithoutChange(1.0);

    expect(tester.getCenter(tester.findText('Hello')) == middleOfContainer, isTrue);

    tester.dispatchEvent(pointer.up(), target);
  });

  test('Can scroll an overflowing block', () {
    WidgetTester tester = new WidgetTester();

    tester.pumpFrame(() {
      return new Block([
        new Container(
          height: 2000.0, // more than 600, the height of the test area
          child: new Text('Hello')
        )
      ],
      key: blockKey);
    });
    tester.pumpFrameWithoutChange(); // for SizeObservers

    Point middleOfContainer = tester.getCenter(tester.findText('Hello'));
    Point target = tester.getCenter(tester.findWidget((widget) => widget.key == blockKey));
    TestPointer pointer = new TestPointer();
    tester.dispatchEvent(pointer.down(target), target);
    tester.dispatchEvent(pointer.move(target + const Offset(0.0, -10.0)), target);

    tester.pumpFrameWithoutChange(1.0);

    expect(tester.getCenter(tester.findText('Hello')) == middleOfContainer, isFalse);

    tester.dispatchEvent(pointer.up(), target);
  });
}