284 lines
10 KiB
Dart
284 lines
10 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/gestures.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter_test/flutter_test.dart';
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void main() {
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testWidgets('ScrollMetricsNotification test', (WidgetTester tester) async {
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final List<Notification> events = <Notification>[];
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Widget buildFrame(double height) {
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return NotificationListener<Notification>(
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onNotification: (Notification value) {
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events.add(value);
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return false;
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},
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child: SingleChildScrollView(
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child: SizedBox(height: height),
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),
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);
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}
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await tester.pumpWidget(buildFrame(1200.0));
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expect(events.length, 1);
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ScrollMetricsNotification event = events[0] as ScrollMetricsNotification;
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expect(event.metrics.extentBefore, 0.0);
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expect(event.metrics.extentInside, 600.0);
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expect(event.metrics.extentAfter, 600.0);
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expect(event.metrics.extentTotal, 1200.0);
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events.clear();
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await tester.pumpWidget(buildFrame(1000.0));
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// Change the content dimensions will trigger a new event.
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expect(events.length, 1);
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event = events[0] as ScrollMetricsNotification;
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expect(event.metrics.extentBefore, 0.0);
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expect(event.metrics.extentInside, 600.0);
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expect(event.metrics.extentAfter, 400.0);
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expect(event.metrics.extentTotal, 1000.0);
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events.clear();
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final TestGesture gesture = await tester.startGesture(const Offset(100.0, 100.0));
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await tester.pump(const Duration(seconds: 1));
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await gesture.moveBy(const Offset(-10.0, -10.0));
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await tester.pump(const Duration(seconds: 1));
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await gesture.up();
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await tester.pump(const Duration(seconds: 1));
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expect(events.length, 5);
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// user scroll do not trigger the ScrollMetricsNotification.
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expect(events[0] is ScrollStartNotification, true);
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expect(events[1] is UserScrollNotification, true);
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expect(events[2] is ScrollUpdateNotification, true);
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expect(events[3] is ScrollEndNotification, true);
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expect(events[4] is UserScrollNotification, true);
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events.clear();
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// Change the content dimensions again.
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await tester.pumpWidget(buildFrame(500.0));
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expect(events.length, 1);
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event = events[0] as ScrollMetricsNotification;
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expect(event.metrics.extentBefore, 0.0);
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expect(event.metrics.extentInside, 600.0);
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expect(event.metrics.extentAfter, 0.0);
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expect(event.metrics.extentTotal, 600.0);
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events.clear();
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// The content dimensions does not change.
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await tester.pumpWidget(buildFrame(500.0));
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expect(events.length, 0);
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});
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testWidgets('Scroll notification basics', (WidgetTester tester) async {
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late ScrollNotification notification;
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await tester.pumpWidget(NotificationListener<ScrollNotification>(
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onNotification: (ScrollNotification value) {
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if (value is ScrollStartNotification || value is ScrollUpdateNotification || value is ScrollEndNotification) {
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notification = value;
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}
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return false;
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},
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child: const SingleChildScrollView(
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child: SizedBox(height: 1200.0),
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),
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));
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final TestGesture gesture = await tester.startGesture(const Offset(100.0, 100.0));
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await tester.pump(const Duration(seconds: 1));
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expect(notification, isA<ScrollStartNotification>());
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expect(notification.depth, equals(0));
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final ScrollStartNotification start = notification as ScrollStartNotification;
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expect(start.dragDetails, isNotNull);
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expect(start.dragDetails!.globalPosition, equals(const Offset(100.0, 100.0)));
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await gesture.moveBy(const Offset(-10.0, -10.0));
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await tester.pump(const Duration(seconds: 1));
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expect(notification, isA<ScrollUpdateNotification>());
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expect(notification.depth, equals(0));
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final ScrollUpdateNotification update = notification as ScrollUpdateNotification;
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expect(update.dragDetails, isNotNull);
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expect(update.dragDetails!.globalPosition, equals(const Offset(90.0, 90.0)));
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expect(update.dragDetails!.delta, equals(const Offset(0.0, -10.0)));
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await gesture.up();
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await tester.pump(const Duration(seconds: 1));
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expect(notification, isA<ScrollEndNotification>());
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expect(notification.depth, equals(0));
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final ScrollEndNotification end = notification as ScrollEndNotification;
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expect(end.dragDetails, isNotNull);
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expect(end.dragDetails!.velocity, equals(Velocity.zero));
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});
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testWidgets('Scroll notification depth', (WidgetTester tester) async {
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final List<Type> depth0Types = <Type>[];
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final List<Type> depth1Types = <Type>[];
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final List<int> depth0Values = <int>[];
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final List<int> depth1Values = <int>[];
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await tester.pumpWidget(NotificationListener<ScrollNotification>(
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onNotification: (ScrollNotification value) {
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depth1Types.add(value.runtimeType);
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depth1Values.add(value.depth);
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return false;
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},
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child: SingleChildScrollView(
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dragStartBehavior: DragStartBehavior.down,
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child: SizedBox(
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height: 1200.0,
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child: NotificationListener<ScrollNotification>(
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onNotification: (ScrollNotification value) {
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depth0Types.add(value.runtimeType);
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depth0Values.add(value.depth);
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return false;
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},
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child: Container(
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padding: const EdgeInsets.all(50.0),
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child: const SingleChildScrollView(
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dragStartBehavior: DragStartBehavior.down,
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child: SizedBox(height: 1200.0),
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),
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),
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),
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),
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),
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));
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final TestGesture gesture = await tester.startGesture(const Offset(100.0, 100.0));
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await tester.pump(const Duration(seconds: 1));
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await gesture.moveBy(const Offset(-10.0, -40.0));
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await tester.pump(const Duration(seconds: 1));
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await gesture.up();
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await tester.pump(const Duration(seconds: 1));
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final List<Type> types = <Type>[
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ScrollStartNotification,
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UserScrollNotification,
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ScrollUpdateNotification,
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ScrollEndNotification,
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UserScrollNotification,
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];
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expect(depth0Types, equals(types));
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expect(depth1Types, equals(types));
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expect(depth0Values, equals(<int>[0, 0, 0, 0, 0]));
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expect(depth1Values, equals(<int>[1, 1, 1, 1, 1]));
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});
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testWidgets('ScrollNotifications bubble past Scaffold Material', (WidgetTester tester) async {
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final List<Type> notificationTypes = <Type>[];
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await tester.pumpWidget(
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MaterialApp(
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home: NotificationListener<ScrollNotification>(
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onNotification: (ScrollNotification value) {
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notificationTypes.add(value.runtimeType);
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return false;
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},
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child: Scaffold(
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body: SizedBox.expand(
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child: SingleChildScrollView(
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dragStartBehavior: DragStartBehavior.down,
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child: SizedBox(
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height: 1200.0,
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child: Container(
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padding: const EdgeInsets.all(50.0),
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child: const SingleChildScrollView(
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dragStartBehavior: DragStartBehavior.down,
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child: SizedBox(height: 1200.0),
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),
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),
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),
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),
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),
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),
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),
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),
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);
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final TestGesture gesture = await tester.startGesture(const Offset(100.0, 100.0));
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await tester.pump(const Duration(seconds: 1));
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await gesture.moveBy(const Offset(-10.0, -40.0));
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await tester.pump(const Duration(seconds: 1));
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await gesture.up();
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await tester.pump(const Duration(seconds: 1));
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final List<Type> types = <Type>[
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ScrollStartNotification,
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UserScrollNotification,
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ScrollUpdateNotification,
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ScrollEndNotification,
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UserScrollNotification,
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];
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expect(notificationTypes, equals(types));
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});
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testWidgets('ScrollNotificationObserver', (WidgetTester tester) async {
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late ScrollNotificationObserverState observer;
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ScrollNotification? notification;
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void handleNotification(ScrollNotification value) {
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if (value is ScrollStartNotification || value is ScrollUpdateNotification || value is ScrollEndNotification) {
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notification = value;
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}
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}
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await tester.pumpWidget(
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ScrollNotificationObserver(
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child: Builder(
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builder: (BuildContext context) {
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observer = ScrollNotificationObserver.of(context);
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return const SingleChildScrollView(
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child: SizedBox(height: 1200.0),
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);
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},
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),
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),
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);
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observer.addListener(handleNotification);
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TestGesture gesture = await tester.startGesture(const Offset(100.0, 100.0));
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await tester.pumpAndSettle();
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expect(notification, isA<ScrollStartNotification>());
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expect(notification!.depth, equals(0));
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final ScrollStartNotification start = notification! as ScrollStartNotification;
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expect(start.dragDetails, isNotNull);
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expect(start.dragDetails!.globalPosition, equals(const Offset(100.0, 100.0)));
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await gesture.moveBy(const Offset(-10.0, -10.0));
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await tester.pumpAndSettle();
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expect(notification, isA<ScrollUpdateNotification>());
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expect(notification!.depth, equals(0));
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final ScrollUpdateNotification update = notification! as ScrollUpdateNotification;
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expect(update.dragDetails, isNotNull);
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expect(update.dragDetails!.globalPosition, equals(const Offset(90.0, 90.0)));
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expect(update.dragDetails!.delta, equals(const Offset(0.0, -10.0)));
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await gesture.up();
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await tester.pumpAndSettle();
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expect(notification, isA<ScrollEndNotification>());
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expect(notification!.depth, equals(0));
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final ScrollEndNotification end = notification! as ScrollEndNotification;
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expect(end.dragDetails, isNotNull);
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expect(end.dragDetails!.velocity, equals(Velocity.zero));
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observer.removeListener(handleNotification);
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notification = null;
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gesture = await tester.startGesture(const Offset(100.0, 100.0));
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await tester.pumpAndSettle();
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expect(notification, isNull);
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await gesture.moveBy(const Offset(-10.0, -10.0));
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await tester.pumpAndSettle();
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expect(notification, isNull);
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await gesture.up();
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await tester.pumpAndSettle();
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expect(notification, isNull);
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});
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}
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