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That way the fling engages in the same direction as the scroll. For example, if you have a horizontal scroll nested inside a vertical scroll, the fling will take place in the same direction as the scroll.
92 lines
2.8 KiB
Dart
92 lines
2.8 KiB
Dart
import 'package:sky/widgets.dart';
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import 'package:test/test.dart';
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import '../engine/mock_events.dart';
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import 'widget_tester.dart';
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void main() {
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test('Uncontested scrolls start immediately', () {
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WidgetTester tester = new WidgetTester();
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TestPointer pointer = new TestPointer(7);
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bool didStartDrag = false;
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double updatedDragDelta;
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bool didEndDrag = false;
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Widget builder() {
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return new GestureDetector(
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onVerticalDragStart: () {
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didStartDrag = true;
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},
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onVerticalDragUpdate: (double scrollDelta) {
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updatedDragDelta = scrollDelta;
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},
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onVerticalDragEnd: (Offset velocity) {
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didEndDrag = true;
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},
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child: new Container()
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);
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}
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tester.pumpFrame(builder);
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expect(didStartDrag, isFalse);
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expect(updatedDragDelta, isNull);
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expect(didEndDrag, isFalse);
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Point firstLocation = new Point(10.0, 10.0);
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tester.dispatchEvent(pointer.down(firstLocation), firstLocation);
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expect(didStartDrag, isTrue);
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didStartDrag = false;
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expect(updatedDragDelta, isNull);
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expect(didEndDrag, isFalse);
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Point secondLocation = new Point(10.0, 9.0);
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tester.dispatchEvent(pointer.move(secondLocation), firstLocation);
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expect(didStartDrag, isFalse);
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expect(updatedDragDelta, 1.0);
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updatedDragDelta = null;
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expect(didEndDrag, isFalse);
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tester.dispatchEvent(pointer.up(), firstLocation);
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expect(didStartDrag, isFalse);
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expect(updatedDragDelta, isNull);
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expect(didEndDrag, isTrue);
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didEndDrag = false;
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tester.pumpFrame(() => new Container());
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});
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test('Match two scroll gestures in succession', () {
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WidgetTester tester = new WidgetTester();
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TestPointer pointer = new TestPointer(7);
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int gestureCount = 0;
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double dragDistance = 0.0;
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Point downLocation = new Point(10.0, 10.0);
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Point upLocation = new Point(10.0, 20.0);
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Widget builder() {
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return new GestureDetector(
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onVerticalDragUpdate: (double delta) { dragDistance += delta; },
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onVerticalDragEnd: (Offset velocity) { gestureCount += 1; },
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onHorizontalDragUpdate: (_) { fail("gesture should not match"); },
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onHorizontalDragEnd: (Offset velocity) { fail("gesture should not match"); },
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child: new Container()
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);
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}
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tester.pumpFrame(builder);
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tester.dispatchEvent(pointer.down(downLocation), downLocation);
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tester.dispatchEvent(pointer.move(upLocation), downLocation);
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tester.dispatchEvent(pointer.up(), downLocation);
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tester.dispatchEvent(pointer.down(downLocation), downLocation);
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tester.dispatchEvent(pointer.move(upLocation), downLocation);
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tester.dispatchEvent(pointer.up(), downLocation);
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expect(gestureCount, 2);
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expect(dragDistance, -20.0);
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});
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}
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