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277 lines
9.8 KiB
Dart
277 lines
9.8 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/material.dart';
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import 'package:flutter/scheduler.dart';
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import 'package:flutter_test/flutter_test.dart';
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List<Widget> children(int n) {
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return List<Widget>.generate(n, (int i) {
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return SizedBox(height: 100.0, child: Text('$i'));
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});
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}
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void main() {
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testWidgets('Scrolling with list view changes, leaving the overscroll', (WidgetTester tester) async {
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final ScrollController controller = ScrollController();
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await tester.pumpWidget(MaterialApp(home: ListView(controller: controller, children: children(30))));
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final double thirty = controller.position.maxScrollExtent;
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controller.jumpTo(thirty);
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await tester.pump();
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controller.jumpTo(thirty + 100.0); // past the end
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await tester.pump();
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await tester.pumpWidget(MaterialApp(home: ListView(controller: controller, children: children(31))));
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expect(controller.position.pixels, thirty + 100.0); // has the same position, but no longer overscrolled
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expect(await tester.pumpAndSettle(), 1); // doesn't have ballistic animation...
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expect(controller.position.pixels, thirty + 100.0); // and ends up at the end
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});
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testWidgets('Scrolling with list view changes, remaining overscrolled', (WidgetTester tester) async {
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final ScrollController controller = ScrollController();
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await tester.pumpWidget(MaterialApp(home: ListView(controller: controller, children: children(30))));
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final double thirty = controller.position.maxScrollExtent;
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controller.jumpTo(thirty);
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await tester.pump();
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controller.jumpTo(thirty + 200.0); // past the end
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await tester.pump();
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await tester.pumpWidget(MaterialApp(home: ListView(controller: controller, children: children(31))));
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expect(controller.position.pixels, thirty + 200.0); // has the same position, still overscrolled
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expect(await tester.pumpAndSettle(), 8); // now it goes ballistic...
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expect(controller.position.pixels, thirty + 100.0); // and ends up at the end
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});
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testWidgets('Ability to keep a PageView at the end manually (issue 62209)', (WidgetTester tester) async {
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await tester.pumpWidget(const MaterialApp(home: PageView62209()));
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expect(find.text('Page 1'), findsOneWidget);
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expect(find.text('Page 100'), findsNothing);
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await tester.drag(find.byType(PageView62209), const Offset(-800.0, 0.0));
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await tester.pump();
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expect(find.text('Page 1'), findsNothing);
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expect(find.text('Page 2'), findsOneWidget);
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expect(find.text('Page 100'), findsNothing);
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await tester.drag(find.byType(PageView62209), const Offset(-800.0, 0.0));
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await tester.pump();
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expect(find.text('Page 1'), findsNothing);
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expect(find.text('Page 3'), findsOneWidget);
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expect(find.text('Page 100'), findsNothing);
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await tester.drag(find.byType(PageView62209), const Offset(-800.0, 0.0));
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await tester.pump();
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expect(find.text('Page 1'), findsNothing);
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expect(find.text('Page 4'), findsOneWidget);
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expect(find.text('Page 100'), findsNothing);
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await tester.drag(find.byType(PageView62209), const Offset(-800.0, 0.0));
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await tester.pump();
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expect(find.text('Page 1'), findsNothing);
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expect(find.text('Page 5'), findsOneWidget);
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expect(find.text('Page 100'), findsNothing);
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await tester.drag(find.byType(PageView62209), const Offset(-800.0, 0.0));
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await tester.pump();
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expect(find.text('Page 1'), findsNothing);
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expect(find.text('Page 5'), findsNothing);
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expect(find.text('Page 100'), findsOneWidget);
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await tester.tap(find.byType(TextButton)); // 6
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await tester.pump();
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expect(find.text('Page 1'), findsNothing);
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expect(find.text('Page 6'), findsNothing);
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expect(find.text('Page 5'), findsNothing);
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expect(find.text('Page 100'), findsOneWidget);
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await tester.tap(find.byType(TextButton)); // 7
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await tester.pump();
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expect(find.text('Page 1'), findsNothing);
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expect(find.text('Page 6'), findsNothing);
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expect(find.text('Page 7'), findsNothing);
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expect(find.text('Page 5'), findsNothing);
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expect(find.text('Page 100'), findsOneWidget);
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await tester.drag(find.byType(PageView62209), const Offset(800.0, 0.0));
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await tester.pump();
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expect(find.text('Page 1'), findsNothing);
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expect(find.text('Page 5'), findsOneWidget);
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expect(find.text('Page 100'), findsNothing);
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await tester.drag(find.byType(PageView62209), const Offset(800.0, 0.0));
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await tester.pump();
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expect(find.text('Page 1'), findsNothing);
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expect(find.text('Page 4'), findsOneWidget);
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expect(find.text('Page 5'), findsNothing);
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expect(find.text('Page 100'), findsNothing);
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await tester.tap(find.byType(TextButton)); // 8
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await tester.pump();
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expect(find.text('Page 1'), findsNothing);
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expect(find.text('Page 8'), findsNothing);
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expect(find.text('Page 4'), findsOneWidget);
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expect(find.text('Page 5'), findsNothing);
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expect(find.text('Page 100'), findsNothing);
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await tester.drag(find.byType(PageView62209), const Offset(800.0, 0.0));
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await tester.pump();
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expect(find.text('Page 3'), findsOneWidget);
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await tester.drag(find.byType(PageView62209), const Offset(800.0, 0.0));
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await tester.pump();
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expect(find.text('Page 2'), findsOneWidget);
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await tester.drag(find.byType(PageView62209), const Offset(800.0, 0.0));
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await tester.pump();
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expect(find.text('Page 6'), findsOneWidget);
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await tester.drag(find.byType(PageView62209), const Offset(800.0, 0.0));
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await tester.pump();
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expect(find.text('Page 7'), findsOneWidget);
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await tester.drag(find.byType(PageView62209), const Offset(800.0, 0.0));
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await tester.pump();
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expect(find.text('Page 8'), findsOneWidget);
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await tester.drag(find.byType(PageView62209), const Offset(800.0, 0.0));
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await tester.pump();
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expect(find.text('Page 1'), findsOneWidget);
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await tester.tap(find.byType(TextButton)); // 9
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await tester.pump();
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expect(find.text('Page 1'), findsOneWidget);
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expect(find.text('Page 9'), findsNothing);
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await tester.drag(find.byType(PageView62209), const Offset(-800.0, 0.0));
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await tester.pump();
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expect(find.text('Page 9'), findsOneWidget);
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});
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}
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class PageView62209 extends StatefulWidget {
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const PageView62209({super.key});
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@override
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State<PageView62209> createState() => _PageView62209State();
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}
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class _PageView62209State extends State<PageView62209> {
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int _nextPageNum = 1;
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final List<Carousel62209Page> _pages = <Carousel62209Page>[];
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@override
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void initState() {
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super.initState();
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for (int i = 0; i < 5; i++) {
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_pages.add(Carousel62209Page(
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key: Key('$_nextPageNum'),
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number: _nextPageNum++,
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));
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}
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_pages.add(const Carousel62209Page(number: 100));
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}
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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body: Column(
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children: <Widget>[
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Expanded(child: Carousel62209(pages: _pages)),
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TextButton(
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child: const Text('ADD PAGE'),
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onPressed: () {
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setState(() {
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_pages.insert(
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1,
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Carousel62209Page(
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key: Key('$_nextPageNum'),
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number: _nextPageNum++,
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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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}
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class Carousel62209Page extends StatelessWidget {
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const Carousel62209Page({required this.number, super.key});
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final int number;
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@override
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Widget build(BuildContext context) {
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return Center(child: Text('Page $number'));
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}
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}
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class Carousel62209 extends StatefulWidget {
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const Carousel62209({super.key, required this.pages});
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final List<Carousel62209Page> pages;
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@override
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State<Carousel62209> createState() => _Carousel62209State();
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}
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class _Carousel62209State extends State<Carousel62209> {
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// page variables
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late PageController _pageController;
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int _currentPage = 0;
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// controls updates outside of user interaction
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late List<Carousel62209Page> _pages;
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bool _jumpingToPage = false;
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@override
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void initState() {
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super.initState();
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_pages = widget.pages.toList();
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_pageController = PageController(keepPage: false);
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}
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@override
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void didUpdateWidget(Carousel62209 oldWidget) {
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super.didUpdateWidget(oldWidget);
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if (!_jumpingToPage) {
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int newPage = -1;
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for (int i = 0; i < widget.pages.length; i++) {
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if (widget.pages[i].number == _pages[_currentPage].number) {
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newPage = i;
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}
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}
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if (newPage == _currentPage) {
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_pages = widget.pages.toList();
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} else {
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_jumpingToPage = true;
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SchedulerBinding.instance.addPostFrameCallback((_) {
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if (mounted) {
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setState(() {
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_pages = widget.pages.toList();
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_currentPage = newPage;
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_pageController.jumpToPage(_currentPage);
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SchedulerBinding.instance.addPostFrameCallback((_) {
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_jumpingToPage = false;
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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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@override
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void dispose() {
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_pageController.dispose();
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super.dispose();
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}
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bool _handleScrollNotification(ScrollNotification notification) {
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if (notification is ScrollUpdateNotification) {
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final int page = _pageController.page!.round();
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if (!_jumpingToPage && _currentPage != page) {
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_currentPage = page;
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}
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}
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return true;
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}
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@override
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Widget build(BuildContext context) {
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return NotificationListener<ScrollNotification>(
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onNotification: _handleScrollNotification,
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child: PageView.builder(
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controller: _pageController,
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itemCount: _pages.length,
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itemBuilder: (BuildContext context, int index) {
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return _pages[index];
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},
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),
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);
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}
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}
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