Flutter 动画列表：动画整个列表

Question

我正在尝试实现 Flutter 的 AnimatedList。我想要实现的是准备好一个元素列表，然后将它们一个一个地插入列表中，总持续时间为 1 秒。

例如：我有一个包含 5 个容器的列表（一个红色容器、一个蓝色容器、一个绿色容器、一个粉红色容器和一个白色容器）。我想让每个容器在列表视图中滑动。

我现在希望在启动时，此列表显示在以下时间戳中：

0..200ms: red container

200..400ms: blue container

400..600ms: green container

600..800ms: pink container

800..1000ms: white container

整个列表需要 1 秒来构建，1 个容器的动画时间应该是 1/n 秒，列表中索引 i 处的每个容器都应该启动它的动画在 i*(1/n) 秒。然而，我能找到的所有文档或示例都只是显示一个按钮，然后在列表中插入一个新项目，而我希望通过动画显示一个已经创建的列表。

Answer 1

你试过了吗Timer.periodic.

您可以简单地使用它并在提到的时间后插入项目。像这样：

void startTimer() {
  const oneSec = const Duration(milliseconds: 1000);
  _timer = new Timer.periodic(
    oneSec,
    (Timer timer) {
      _insert();
      if(_list.length == 10){
      timer.cancel();
      }
    },
  );

Dart pad 上的完整代码：

/// Flutter code sample for AnimatedList

// This sample application uses an [AnimatedList] to create an effect when
// items are removed or added to the list.
import 'dart:async';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(const AnimatedListSample());
}

class AnimatedListSample extends StatefulWidget {
  const AnimatedListSample({Key? key}) : super(key: key);

  @override
  _AnimatedListSampleState createState() => _AnimatedListSampleState();
}

class _AnimatedListSampleState extends State<AnimatedListSample> {
  final GlobalKey<AnimatedListState> _listKey = GlobalKey<AnimatedListState>();
  late ListModel<int> _list;
  int? _selectedItem;
  late int
      _nextItem; // The next item inserted when the user presses the '+' button.

  Timer? _timer;
  @override
  void initState() {
    super.initState();
    _list = ListModel<int>(
      listKey: _listKey,
      initialItems: <int>[0, 1, 2],
      removedItemBuilder: _buildRemovedItem,
    );
    _nextItem = 3;
    startTimer();
  }

  void startTimer() {
  const oneSec = const Duration(milliseconds: 1000);
  _timer = new Timer.periodic(
    oneSec,
    (Timer timer) {
      _insert();
      if(_list.length == 10){
      timer.cancel();
      }
    },
  );
}
  
  @override
void dispose() {
  _timer!.cancel();
  super.dispose();
}

  // Used to build list items that haven't been removed.
  Widget _buildItem(
      BuildContext context, int index, Animation<double> animation) {
    return CardItem(
      animation: animation,
      item: _list[index],
      selected: _selectedItem == _list[index],
      onTap: () {
        setState(() {
          _selectedItem = _selectedItem == _list[index] ? null : _list[index];
        });
      },
    );
  }

  // Used to build an item after it has been removed from the list. This
  // method is needed because a removed item remains visible until its
  // animation has completed (even though it's gone as far this ListModel is
  // concerned). The widget will be used by the
  // [AnimatedListState.removeItem] method's
  // [AnimatedListRemovedItemBuilder] parameter.
  Widget _buildRemovedItem(
      int item, BuildContext context, Animation<double> animation) {
    return CardItem(
      animation: animation,
      item: item,
      selected: false,
      // No gesture detector here: we don't want removed items to be interactive.
    );
  }

  // Insert the "next item" into the list model.
  void _insert() {
    final int index =
        _selectedItem == null ? _list.length : _list.indexOf(_selectedItem!);
    _list.insert(index, _nextItem++);
  }

  // Remove the selected item from the list model.
  void _remove() {
    if (_selectedItem != null) {
      _list.removeAt(_list.indexOf(_selectedItem!));
      setState(() {
        _selectedItem = null;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('AnimatedList'),
          actions: <Widget>[
            IconButton(
              icon: const Icon(Icons.add_circle),
              onPressed: _insert,
              tooltip: 'insert a new item',
            ),
            IconButton(
              icon: const Icon(Icons.remove_circle),
              onPressed: _remove,
              tooltip: 'remove the selected item',
            ),
          ],
        ),
        body: Padding(
          padding: const EdgeInsets.all(16.0),
          child: AnimatedList(
            key: _listKey,
            initialItemCount: _list.length,
            itemBuilder: _buildItem,
          ),
        ),
      ),
    );
  }
}

typedef RemovedItemBuilder = Widget Function(
    int item, BuildContext context, Animation<double> animation);

/// Keeps a Dart [List] in sync with an [AnimatedList].
///
/// The [insert] and [removeAt] methods apply to both the internal list and
/// the animated list that belongs to [listKey].
///
/// This class only exposes as much of the Dart List API as is needed by the
/// sample app. More list methods are easily added, however methods that
/// mutate the list must make the same changes to the animated list in terms
/// of [AnimatedListState.insertItem] and [AnimatedList.removeItem].
class ListModel<E> {
  ListModel({
    required this.listKey,
    required this.removedItemBuilder,
    Iterable<E>? initialItems,
  }) : _items = List<E>.from(initialItems ?? <E>[]);

  final GlobalKey<AnimatedListState> listKey;
  final RemovedItemBuilder removedItemBuilder;
  final List<E> _items;

  AnimatedListState? get _animatedList => listKey.currentState;

  void insert(int index, E item) {
    _items.insert(index, item);
    _animatedList!.insertItem(index);
  }

  E removeAt(int index) {
    final E removedItem = _items.removeAt(index);
    if (removedItem != null) {
      _animatedList!.removeItem(
        index,
        (BuildContext context, Animation<double> animation) {
          return removedItemBuilder(index, context, animation);
        },
      );
    }
    return removedItem;
  }

  int get length => _items.length;

  E operator [](int index) => _items[index];

  int indexOf(E item) => _items.indexOf(item);
}

/// Displays its integer item as 'item N' on a Card whose color is based on
/// the item's value.
///
/// The text is displayed in bright green if [selected] is
/// true. This widget's height is based on the [animation] parameter, it
/// varies from 0 to 128 as the animation varies from 0.0 to 1.0.
class CardItem extends StatelessWidget {
  const CardItem({
    Key? key,
    this.onTap,
    this.selected = false,
    required this.animation,
    required this.item,
  })   : assert(item >= 0),
        super(key: key);

  final Animation<double> animation;
  final VoidCallback? onTap;
  final int item;
  final bool selected;

  @override
  Widget build(BuildContext context) {
    TextStyle textStyle = Theme.of(context).textTheme.headline4!;
    if (selected)
      textStyle = textStyle.copyWith(color: Colors.lightGreenAccent[400]);
    return Padding(
      padding: const EdgeInsets.all(2.0),
      child: SizeTransition(
        axis: Axis.vertical,
        sizeFactor: animation,
        child: GestureDetector(
          behavior: HitTestBehavior.opaque,
          onTap: onTap,
          child: SizedBox(
            height: 80.0,
            child: Card(
              color: Colors.primaries[item % Colors.primaries.length],
              child: Center(
                child: Text('Item $item', style: textStyle),
              ),
            ),
          ),
        ),
      ),
    );
  }
}

您可以使用您喜欢的任何公式在 startTimer 方法中自定义该持续时间。请记住，如您所述，持续时间应为 200 毫秒。

Flutter 动画列表：动画整个列表

Flutter animated list: animate entire list

flutter

dart

flutter-animatedlist