Flutter动画扩展插件starxpand的使用
Flutter动画扩展插件starxpand的使用
StarXpand SDK for Flutter
一个用于使用Star Micronics打印机的StarXpand包装器。
通过此插件,您的应用程序可以在Android和iOS上轻松打印到Star打印机。
前提条件
- 部署目标为iOS 12.0或更高版本。
- Android的minSdkVersion为21或更高版本。
iOS
如果需要,在info.plist中添加读取协议(https://github.com/star-micronics/StarXpand-SDK-iOS):
<key>UISupportedExternalAccessoryProtocols</key>
<array>
<string>jp.star-m.starpro</string>
</array>
在info.plist中添加元素(https://github.com/star-micronics/StarXpand-SDK-iOS):
<key>NSBluetoothAlwaysUsageDescription</key>
<string>我们的应用使用蓝牙来查找、连接和打印到Star打印机。</string>
<key>NSBluetoothPeripheralUsageDescription</key>
<string>我们的应用使用蓝牙来查找、连接和打印到Star打印机。</string>
<key>NSLocalNetworkUsageDescription</key>
<string>我们的应用使用局域网来查找、连接和打印到Star打印机。</string>
安装
在pubspec.yaml
文件中添加starxpand:
dependencies:
starxpand:
导入starxpand:
import 'package:starxpand/starxpand.dart';
开始使用
查找打印机:
var printers = await StarXpand.findPrinters();
setState(() {
_printers = printers;
});
打印:
var doc = StarXpandDocument();
var printDoc = StarXpandDocumentPrint();
printDoc.actionPrintText("SKU Description Total\n"
"--------------------------------\n"
"300678566 PLAIN T-SHIRT 10.99\n"
"300692003 BLACK DENIM 29.99\n"
"300651148 BLUE DENIM 29.99\n"
"300642980 STRIPED DRESS 49.99\n"
"300638471 BLACK BOOTS 35.99\n"
"Subtotal 156.95\n"
"Tax 0.00\n"
"--------------------------------\n");
printDoc.actionPrintText("Total ");
printDoc.add(StarXpandDocumentPrint()
..style(magnification: StarXpandStyleMagnification(2, 2))
..actionPrintText(" \$156.95\n"));
doc.addPrint(printDoc);
doc.addDrawer(StarXpandDocumentDrawer());
StarXpand.printDocument(printer, doc);
可用API
StarXpand.findPrinters(interfaces, timeout, callback);
StarXpand.openDrawer(printer);
StarXpand.printDocument(printer, document);
StarXpand.startInputListener(printer);
StarXpand.stopInputListener(printer, guid);
示例代码
import 'package:flutter/material.dart';
import 'dart:async';
import 'package:http/http.dart' as http;
import 'package:flutter/services.dart';
import 'package:starxpand/starxpand.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatefulWidget {
const MyApp({Key? key}) : super(key: key);
[@override](/user/override)
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
List<StarXpandPrinter>? printers;
[@override](/user/override)
void initState() {
super.initState();
}
// 平台消息是异步的,因此我们初始化在一个异步方法中。
Future<void> _find() async {
var ps = await StarXpand.findPrinters(
callback: (payload) => print('printer: $payload'));
setState(() {
printers = ps;
});
}
_openDrawer(StarXpandPrinter printer) {
StarXpand.openDrawer(printer);
}
_startInputListener(StarXpandPrinter printer) {
StarXpand.startInputListener(
printer, (p) => print('_startInputListener: ${p.inputString}'));
}
_print(StarXpandPrinter printer) async {
var doc = StarXpandDocument();
var printDoc = StarXpandDocumentPrint();
http.Response response = await http.get(
Uri.parse('https://ovatu.com/marketing/images/ovatu/logo-large-navy.png'),
);
printDoc.actionPrintImage(response.bodyBytes, 350);
printDoc.style(
internationalCharacter: StarXpandStyleInternationalCharacter.usa,
characterSpace: 0.0,
alignment: StarXpandStyleAlignment.center);
printDoc.actionPrintText("Star Clothing Boutique\n"
"123 Star Road\n"
"City, State 12345\n");
printDoc.style(alignment: StarXpandStyleAlignment.left);
printDoc.actionPrintText("Date:MM/DD/YYYY Time:HH:MM PM\n"
"--------------------------------\n");
printDoc.add(StarXpandDocumentPrint()
..style(bold: true)
..actionPrintText("SALE\n"));
printDoc.actionPrintText("SKU Description Total\n"
"--------------------------------\n"
"300678566 PLAIN T-SHIRT 10.99\n"
"300692003 BLACK DENIM 29.99\n"
"300651148 BLUE DENIM 29.99\n"
"300642980 STRIPED DRESS 49.99\n"
"300638471 BLACK BOOTS 35.99\n"
"Subtotal 156.95\n"
"Tax 0.00\n"
"--------------------------------\n");
printDoc.actionPrintText("Total ");
printDoc.add(StarXpandDocumentPrint()
..style(magnification: StarXpandStyleMagnification(2, 2))
..actionPrintText(" \$156.95\n"));
printDoc.actionPrintText("--------------------------------\n"
"Charge\n"
"156.95\n"
"Visa XXXX-XXXX-XXXX-0123\n");
printDoc.add(StarXpandDocumentPrint()
..style(invert: true)
..actionPrintText("Refunds and Exchanges\n"));
printDoc.actionPrintText("Within ");
printDoc.add(StarXpandDocumentPrint()
..style(underLine: true)
..actionPrintText("30 days"));
printDoc.actionPrintText(" with receipt\n");
printDoc.actionPrintText("And tags attached\n\n");
printDoc.style(alignment: StarXpandStyleAlignment.center);
printDoc.actionPrintBarcode("0123456",
symbology: StarXpandBarcodeSymbology.jan8,
barDots: 3,
height: 5,
printHri: true);
printDoc.actionFeedLine(1);
printDoc.actionPrintQRCode("Hello, World\n",
level: StarXpandQRCodeLevel.l, cellSize: 8);
printDoc.actionCut(StarXpandCutType.partial);
doc.addPrint(printDoc);
doc.addDrawer(StarXpandDocumentDrawer());
StarXpand.printDocument(printer, doc);
}
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('Plugin example app'),
),
body: Column(children: [
TextButton(child: Text('FInd'), onPressed: () => _find()),
if (printers != null)
for (var p in printers!)
ListTile(
onTap: () => _print(p),
title: Text(p.model.label),
subtitle: Text(p.identifier),
trailing: Text(p.interface.name))
]),
),
);
}
}
更多关于Flutter动画扩展插件starxpand的使用的实战教程也可以访问 https://www.itying.com/category-92-b0.html
更多关于Flutter动画扩展插件starxpand的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
当然,下面是一个关于如何在Flutter项目中使用starxpand
插件来实现动画扩展的代码示例。starxpand
插件(假设它类似于其他动画扩展插件)可以帮助你在Flutter应用中创建复杂的动画效果。由于starxpand
这个具体名称在Flutter社区中并不常见,这里我将以一个假设的动画扩展插件为基础,展示如何在Flutter中实现类似的功能。
假设我们有一个名为animated_expander
的插件,它提供了动画扩展的功能。以下是如何在Flutter中使用它的一个示例:
-
添加依赖: 首先,在你的
pubspec.yaml
文件中添加animated_expander
依赖(注意:这里animated_expander
是假设的插件名,实际使用时请替换为真实的插件名):dependencies: flutter: sdk: flutter animated_expander: ^x.y.z # 替换为实际的版本号
-
导入插件: 在你的Dart文件中导入插件:
import 'package:animated_expander/animated_expander.dart';
-
使用插件: 下面是一个完整的示例,展示如何使用
AnimatedExpander
(假设的组件名)来实现一个简单的动画扩展效果:import 'package:flutter/material.dart'; import 'package:animated_expander/animated_expander.dart'; // 假设的导入 void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Animated Expander Demo', theme: ThemeData( primarySwatch: Colors.blue, ), home: AnimatedExpanderDemo(), ); } } class AnimatedExpanderDemo extends StatefulWidget { @override _AnimatedExpanderDemoState createState() => _AnimatedExpanderDemoState(); } class _AnimatedExpanderDemoState extends State<AnimatedExpanderDemo> with SingleTickerProviderStateMixin { bool isExpanded = false; @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('Animated Expander Demo'), ), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ Text( 'Click the button to expand/collapse', style: TextStyle(fontSize: 24), ), SizedBox(height: 20), AnimatedExpander( // 假设的组件 expanded: isExpanded, duration: Duration(seconds: 1), curve: Curves.easeInOut, header: Text( isExpanded ? 'Collapse' : 'Expand', style: TextStyle(fontSize: 20, color: Colors.blue), ), builder: (context, expanded) { return Container( height: expanded ? 200 : 0, color: Colors.lightBlueAccent, child: Center( child: Text( 'This is the expanded content!', style: TextStyle(fontSize: 18, color: Colors.white), ), ), ); }, onToggle: (newValue) { setState(() { isExpanded = newValue; }); }, ), ], ), ), ); } }
在这个示例中,我们创建了一个简单的Flutter应用,其中包含一个可展开的动画部分。当用户点击按钮时,内容部分会以动画形式展开或折叠。
AnimatedExpander
是一个假设的组件,它接受多个参数,包括expanded
(当前是否展开)、duration
(动画持续时间)、curve
(动画曲线)、header
(头部内容)以及一个builder
函数,用于构建展开或折叠时的内容。onToggle
回调函数用于在展开或折叠状态改变时更新状态。
请注意,由于starxpand
插件在Flutter社区中并不常见,上述代码示例是基于假设的animated_expander
插件编写的。如果你使用的是特定的动画扩展插件,请参考该插件的官方文档以获取正确的使用方法和API。