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feat: using existedChildren instead of autoWrap.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,189 @@ | ||
| // Copyright 2019 The Fuchsia Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
|
|
||
| // This file may have been modified by Bytedance Inc.(“Bytedance Inc.'s | ||
| // Modifications”). All Bytedance Inc.'s Modifications are Copyright (2022) | ||
| // Bytedance Inc.. | ||
|
|
||
| import 'dart:math'; | ||
| import 'package:flutter/material.dart'; | ||
| import 'package:scroll_kit/scroll_kit.dart'; | ||
|
|
||
| const numberOfItems = 5001; | ||
| const minItemHeight = 20.0; | ||
| const maxItemHeight = 150.0; | ||
| const scrollDuration = Duration(seconds: 2); | ||
|
|
||
| const randomMax = 1 << 32; | ||
|
|
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| class ScrollToPage extends StatefulWidget { | ||
| const ScrollToPage({Key? key}) : super(key: key); | ||
|
|
||
| @override | ||
| _ScrollablePositionedListPageState createState() => | ||
| _ScrollablePositionedListPageState(); | ||
| } | ||
|
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| class _ScrollablePositionedListPageState | ||
| extends State<ScrollToPage> { | ||
|
|
||
| late List<double> itemHeights; | ||
| late List<Color> itemColors; | ||
| bool reversed = false; | ||
|
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| /// The alignment to be used next time the user scrolls or jumps to an item. | ||
| double alignment = 0; | ||
|
|
||
| @override | ||
| void initState() { | ||
| super.initState(); | ||
| final heightGenerator = Random(328902348); | ||
| final colorGenerator = Random(42490823); | ||
| itemHeights = List<double>.generate( | ||
| numberOfItems, | ||
| (int _) => | ||
| heightGenerator.nextDouble() * (maxItemHeight - minItemHeight) + | ||
| minItemHeight); | ||
| itemColors = List<Color>.generate(numberOfItems, | ||
| (int _) => Color(colorGenerator.nextInt(randomMax)).withOpacity(1)); | ||
| } | ||
|
|
||
| @override | ||
| Widget build(BuildContext context) => Material( | ||
| child: OrientationBuilder( | ||
| builder: (context, orientation) => Column( | ||
| children: <Widget>[ | ||
| Expanded( | ||
| child: list1(), | ||
| // child: list(orientation), | ||
| ), | ||
| Container( | ||
| height: 100, | ||
| child: Row( | ||
| children: <Widget>[ | ||
| Column( | ||
| children: <Widget>[ | ||
| scrollControlButtons, | ||
| ], | ||
| ), | ||
| ], | ||
| ) | ||
| ) | ||
| ], | ||
| ), | ||
| ), | ||
| ); | ||
|
|
||
| Widget get alignmentControl => Row( | ||
| mainAxisSize: MainAxisSize.max, | ||
| children: <Widget>[ | ||
| const Text('Alignment: '), | ||
| SizedBox( | ||
| width: 100, | ||
| child: SliderTheme( | ||
| data: SliderThemeData( | ||
| showValueIndicator: ShowValueIndicator.always, | ||
| ), | ||
| child: Slider( | ||
| value: alignment, | ||
| label: alignment.toStringAsFixed(2), | ||
| onChanged: (double value) => setState(() => alignment = value), | ||
| ), | ||
| ), | ||
| ), | ||
| ], | ||
| ); | ||
|
|
||
| late SKPositionController controller; | ||
|
|
||
| List<int> data = () { | ||
| List<int> data = <int>[]; | ||
| for (var i = 0; i < 50; i++) { | ||
| data.add(i); | ||
| } | ||
| return data; | ||
| }(); | ||
|
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| Widget list1() { | ||
|
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| controller = SKPositionController( | ||
| viewportBoundaryGetter: () => | ||
| Rect.fromLTRB(0, 0, 0, MediaQuery.of(context).padding.bottom), | ||
| axis: Axis.vertical | ||
| ); | ||
|
|
||
| return SKPositionedList( | ||
| controller: controller, | ||
| delegate: SKSliverChildBuilderDelegate( | ||
| (context, index) { | ||
| return Container( | ||
| height: 80, | ||
| color: Colors.grey, | ||
| child: Center( | ||
| child: Text(data[index].toString()), | ||
| ), | ||
| ); | ||
| }, | ||
| childCount: data.length, | ||
| reuseIdentifier: (i)=>"" | ||
| ), | ||
| ); | ||
| } | ||
|
|
||
| Widget get scrollControlButtons => Row( | ||
| children: <Widget>[ | ||
| const Text('scroll to'), | ||
| scrollButton(0), | ||
| scrollButton(5), | ||
| scrollButton(10), | ||
| scrollButton(30), | ||
| ], | ||
| ); | ||
|
|
||
| final _scrollButtonStyle = ButtonStyle( | ||
| padding: MaterialStateProperty.all( | ||
| const EdgeInsets.symmetric(horizontal: 20, vertical: 0), | ||
| ), | ||
| minimumSize: MaterialStateProperty.all(Size.zero), | ||
| tapTargetSize: MaterialTapTargetSize.shrinkWrap, | ||
| ); | ||
|
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||
| Widget scrollButton(int value) => TextButton( | ||
| key: ValueKey<String>('Scroll$value'), | ||
| onPressed: () => scrollTo(value), | ||
| child: Text('$value'), | ||
| style: _scrollButtonStyle, | ||
| ); | ||
|
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| Widget jumpButton(int value) => TextButton( | ||
| key: ValueKey<String>('Jump$value'), | ||
| onPressed: () async { | ||
| await jumpTo(value); | ||
| }, | ||
| child: Text('$value'), | ||
| style: _scrollButtonStyle, | ||
| ); | ||
|
|
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| Future<void> scrollTo(int index) { | ||
| return controller.scrollTo(index); | ||
| } | ||
|
|
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| Future<void> jumpTo(int index) { | ||
| return controller.jumpTo(index); | ||
| } | ||
|
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||
| /// Generate item number [i]. | ||
| Widget item(int i, Orientation orientation) { | ||
| return SizedBox( | ||
| height: orientation == Orientation.portrait ? itemHeights[i] : null, | ||
| width: orientation == Orientation.landscape ? itemHeights[i] : null, | ||
| child: Container( | ||
| color: itemColors[i], | ||
| child: Center( | ||
| child: Text('Item $i'), | ||
| ), | ||
| ), | ||
| ); | ||
| } | ||
| } |
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