下面是一个简单的礼物发送系统的实现代码，包括支持连送和单次送等功能：
import 'package:flutter/material.dart'; class Gift { final String name; final int count; Gift(this.name, this.count); } class GiftSendingScreen extends StatefulWidget { const GiftSendingScreen({Key? key}) : super(key: key); @override _GiftSendingScreenState createState() => _GiftSendingScreenState(); } class _GiftSendingScreenState extends State<GiftSendingScreen> { List<Gift> _gifts = [ Gift('Heart', 1), Gift('Rose', 1), Gift('Candy', 1), Gift('Teddy Bear', 5), Gift('Diamond Ring', 10), ]; Gift? _selectedGift; int _sendingCount = 1; bool _isSendingContinuously = false; void _sendGift() { if (_selectedGift != null) { for (int i = 0; i < _sendingCount; i++) { // simulate sending gift to server print('Sending gift ${_selectedGift!.name}...'); } if (_isSendingContinuously) { // continue sending gifts after a delay Future.delayed(Duration(seconds: 1), () { _sendGift(); }); } } } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: const Text('Send Gift'), ), body: Column( crossAxisAlignment: CrossAxisAlignment.stretch, children: [ DropdownButtonFormField<Gift>( decoration: InputDecoration( labelText: 'Select a gift', ), value: _selectedGift, onChanged: (gift) { setState(() { _selectedGift = gift; }); }, items: _gifts .map( (gift) => DropdownMenuItem<Gift>( value: gift, child: Text('${gift.name} (${gift.count})'), ), ) .toList(), ), TextFormField( keyboardType: TextInputType.number, decoration: InputDecoration( labelText: 'Sending count', ), initialValue: '1', onChanged: (value) { setState(() { _sendingCount = int.tryParse(value) ?? 0; }); }, ), Row( children: [ Checkbox( value: _isSendingContinuously, onChanged: (value) { setState(() { _isSendingContinuously = value ?? false; }); }, ), Text('Send continuously'), ], ), ElevatedButton( onPressed: _sendGift, child: Text('Send'), ), ], ), ); } }
在这个示例中，我们使用了 Flutter 的 DropdownButtonFormField 和 TextFormField 等组件来获取用户选择的礼物和发送数量。我们还使用了 Checkbox 组件来允许用户选择是否连续发送礼物。在 _sendGift() 方法中，我们模拟将礼物发送到服务器，并且如果用户选择了连续发送，我们将延迟一秒钟后再次调用该方法以持续发送礼物。
以下是一个简单的收到礼物系统的实现代码，支持展示连送和单次送等数量：
import 'package:flutter/material.dart'; class ReceivedGift { final String name; final int count; ReceivedGift(this.name, this.count); } class GiftReceivingScreen extends StatefulWidget { const GiftReceivingScreen({Key? key}) : super(key: key); @override _GiftReceivingScreenState createState() => _GiftReceivingScreenState(); } class _GiftReceivingScreenState extends State<GiftReceivingScreen> { List<ReceivedGift> _receivedGifts = []; void _receiveGift(ReceivedGift gift) { setState(() { // check if the same gift is already received var existingGift = _receivedGifts.firstWhere( (g) => g.name == gift.name, orElse: () => null, ); if (existingGift != null) { // increment count of existing gift _receivedGifts[_receivedGifts.indexOf(existingGift)] = ReceivedGift(gift.name, existingGift.count + gift.count); } else { // add new gift to received gifts list _receivedGifts.add(gift); } }); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: const Text('Received Gifts'), ), body: ListView.builder( itemCount: _receivedGifts.length, itemBuilder: (BuildContext context, int index) { var receivedGift = _receivedGifts[index]; // build text based on number of gifts received var text = '${receivedGift.name} received'; if (receivedGift.count > 1) { text += ' (${receivedGift.count}'; text += receivedGift.count > 2 ? ' times)' : ' time)'; } return ListTile( title: Text(text), ); }, ), ); } }
在这个示例中，我们使用了一个 _receivedGifts 列表来追踪用户收到的礼物。在 _receiveGift() 方法中，我们检查是否已经收到过相同的礼物，如果是，则增加现有礼物的数量；否则，将新礼物添加到列表中。
在 build() 方法中，我们使用 ListView.builder 来构建收到的礼物列表，并根据礼物数目构建展示文本。例如，如果用户收到多次相同礼物，则文本为“礼物名称接收（次数）”。
