| // Copyright 2014 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| import 'package:flutter/material.dart'; |
| import 'package:flutter_api_samples/widgets/drag_target/draggable.0.dart' |
| as example; |
| import 'package:flutter_test/flutter_test.dart'; |
| |
| void main() { |
| Finder findContainerWith({ |
| required Finder child, |
| required Color color, |
| }) { |
| return find.ancestor( |
| of: child, |
| matching: find.byWidgetPredicate( |
| (Widget widget) => widget is Container && widget.color == color, |
| ), |
| ); |
| } |
| |
| testWidgets('Verify initial state', (WidgetTester tester) async { |
| await tester.pumpWidget( |
| const example.DraggableExampleApp(), |
| ); |
| |
| expect(find.text('Draggable Sample'), findsOneWidget); |
| |
| expect( |
| findContainerWith( |
| color: Colors.lightGreenAccent, |
| child: find.text('Draggable'), |
| ), |
| findsOneWidget, |
| ); |
| |
| expect( |
| findContainerWith( |
| color: Colors.cyan, |
| child: find.text('Value is updated to: 0'), |
| ), |
| findsOneWidget, |
| ); |
| }); |
| |
| testWidgets('Verify correct containers are displayed while dragging', (WidgetTester tester) async { |
| await tester.pumpWidget( |
| const example.DraggableExampleApp(), |
| ); |
| |
| final Finder idleContainer = findContainerWith( |
| color: Colors.lightGreenAccent, |
| child: find.text('Draggable'), |
| ); |
| final Finder draggingContainer = findContainerWith( |
| color: Colors.pinkAccent, |
| child: find.text('Child When Dragging'), |
| ); |
| final Finder feedbackContainer = findContainerWith( |
| color: Colors.deepOrange, |
| child: find.byIcon(Icons.directions_run), |
| ); |
| |
| expect(idleContainer, findsOneWidget); |
| expect(draggingContainer, findsNothing); |
| expect(feedbackContainer, findsNothing); |
| |
| final TestGesture gesture = await tester.startGesture( |
| tester.getCenter(idleContainer), |
| ); |
| await tester.pump(); |
| |
| expect(idleContainer, findsNothing); |
| expect(draggingContainer, findsOneWidget); |
| expect(feedbackContainer, findsOneWidget); |
| |
| await gesture.moveBy(const Offset(200, 0)); |
| await tester.pump(); |
| |
| expect(idleContainer, findsNothing); |
| expect(draggingContainer, findsOneWidget); |
| expect(feedbackContainer, findsOneWidget); |
| |
| await gesture.up(); |
| await tester.pump(); |
| |
| expect(idleContainer, findsOneWidget); |
| expect(draggingContainer, findsNothing); |
| expect(feedbackContainer, findsNothing); |
| }); |
| |
| testWidgets('Dropping Draggable over DragTarget updates the counter', (WidgetTester tester) async { |
| await tester.pumpWidget( |
| const example.DraggableExampleApp(), |
| ); |
| |
| final Finder draggable = find.byType(Draggable<int>); |
| final Finder target = find.byType(DragTarget<int>); |
| |
| int counter = 0; |
| |
| for (int i = 0; i < 5; i++) { |
| final TestGesture gesture = await tester.startGesture( |
| tester.getCenter(draggable), |
| ); |
| await gesture.moveTo(tester.getCenter(target)); |
| await gesture.up(); |
| await tester.pump(); |
| |
| counter += 10; |
| |
| expect( |
| findContainerWith( |
| color: Colors.cyan, |
| child: find.text('Value is updated to: $counter'), |
| ), |
| findsOneWidget, |
| ); |
| } |
| }); |
| } |