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.markdown-body { line-height: 1.75; font-weight: 400; font-size: 15px; overflow-x: hidden; color: rgba(43, 43, 43, 1); font-family: -apple-system, system-ui, BlinkMacSystemFont, Helvetica Neue, PingFang SC, Hiragino Sans GB, Microsoft YaHei, Arial, sans-serif; background-image: linear-gradient(90deg, rgba(159, 219, 252, 0.15) 3%, rgba(0, 0, 0, 0) 0), linear-gradient(1turn, rgba(159, 219, 252, 0.15) 3%, rgba(0, 0, 0, 0) 0); background-size: 20px 20px; background-position: center }
.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4, .markdown-body h5, .markdown-body h6 { padding: 30px 0; margin-top: 35px; margin-bottom: 10px; color: rgba(77, 208, 225, 1) }
.markdown-body h1 { font-size: 30px; text-align: center; position: relative; width: max-content; margin: 0 auto }
.markdown-body h1:before { position: absolute; content: ""; z-index: -1; top: -20px; height: 100%; width: 100px; left: 0; right: 0; margin: 0 auto; background: 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.markdown-body h1:after { position: absolute; content: ""; width: 150%; left: -25%; height: 50%; bottom: 12px; border-radius: 50%; background: linear-gradient(rgba(0, 0, 0, 0) 80%, rgba(77, 208, 225, 0.8)); opacity: 0.6; animation: 6s linear infinite h1animate }
@keyframes h1Animate { 0% { background-position: right bottom } 50% { background-position: right } 100% { background-position: right bottom } }
.markdown-body h2 { display: block; border-bottom: 4px solid rgba(77, 208, 225, 1); position: relative; font-size: 24px; padding: 12px 32px; margin: 30px 0 }
.markdown-body h2:before { width: 24px; height: 24px; left: 0; top: 0; margin: auto; background-size: 24px 24px; background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAADGklEQVRYR81X32vTYBQ999s6mFjQgQ+DrbHiVFZYU4cDcQ/6pGhTFVYFEXGi82H+Bz448UnEF1Fx9ccEEcXpZE3d5tP2ooKiTacTHaLNpigMHDgnU9tcSbrWrkwWR0sbyEOSe885ObnfvV8IRT6oyPwoLQHBx+OVM5WJvSyEVAhnBOjt7yU/+/rr6r6l8TMO+F/EN0JQhICqQpD/xaRpcpAc9tS+M+9lBCia/oqBamK+zeDuQogQZaKJk3wcQjxSva7tGQGB2Ke1zIk3DNyMyNL+QpCnMQOaPsDAVuGAp9cjvbYc8Ec/bCYSg0zoiHilk1tHxqsqEsYlML4kjIpT/eurJxRNPweQU5VdrWaOEo1fgKAVbBgXIz73kF3R/ph+ghgdzMYWM29eAWlBJqgZaFlFYtC6nhWpaDqnSGlIlV1WjJ3DloDNgyNLncudqgX//Ucg3LxuStHGuhi8pqKCW3rqV342rwFjRznKm+/LNaN2yC237ThgF2wxcfMLeP6+ncrKzoPoKTGeLQbYbg4TNoC5iZPJY5HGVRdSNZAWYBclD3FzBQzrR8hACAKdzBzKA/4/IYioDQaOskBbpEG6PO8qKKSAEi3CnEb0Pw4oMf0OmKbTDWqh3Lw6EIiNBZi5lxh3wz4puBD5ovqAMvxhHSdFKxE1CQe3m/07TeTX4lcJdAhE+1Sv65Z5P/ByvIGTRowIZ9igbtXnmrOsbTvgj+kHBNMuBu9OdVw8EeU4nC1A0cYmAHZOTRrLhra4Z8ywnSN6vZHAFTA2WnnMfQB3qz73ddsOZM8CACFDIPSgQXqebXEgqgeZcAeEe6pXasm1f8ew3igMtAHWac0Uc/jYdyAaP0xEBwFsmgUPqbJ0NE2UKj4EGcahiOzuyhagaHpnmtgcVgTcCMuua7YdyAHbA3ArQNscVFbb4635aD6fnYaTvxxi9UNP7ddMXaRWVBdAcaLk6bDXPZCNZ9uBXEsDUX1T2Cc9yjig6Z0EHg3LK8/aqf6MwJKchkXfks1+0+JtSq3qLPa23BRR1B+T/6nkfMaW1r9hPt/MLtYfTLEpP+T9FNoAAAAASUVORK5CYII=") }
.markdown-body h2:after, .markdown-body h2:before { content: ""; display: block; position: absolute; bottom: 0 }
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.markdown-body h3 { margin: 30px 0; font-size: 18px; position: relative; padding: 4px 32px; width: max-content }
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.markdown-body del { color: rgba(77, 208, 225, 1) }
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.markdown-body pre>code { font-size: 12px; padding: 15px 12px; margin: 0; word-break: normal; display: block; overflow-x: auto; color: rgba(51, 51, 51, 1); background: rgba(248, 248, 248, 1) }
.markdown-body a { color: rgba(77, 208, 225, 1); border-bottom: 1px solid rgba(77, 208, 225, 1); font-weight: 400; text-decoration: none; margin: 0 4px }
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.markdown-body strong { color: rgba(38, 198, 218, 1) }
.markdown-body strong:before { content: "「" }
.markdown-body strong:after { content: "」" }
.markdown-body em { font-style: normal; color: rgba(77, 208, 225, 1); font-weight: 700 }
.markdown-body table { display: inline-block !important; font-size: 12px; width: auto; max-width: 100%; overflow: auto; border: 1px solid rgba(246, 246, 246, 1) }
.markdown-body thead { background: rgba(246, 246, 246, 1); color: rgba(0, 0, 0, 1); text-align: left }
.markdown-body tr:nth-child(2n) { background-color: rgba(77, 208, 225, 0.05) }
.markdown-body td, .markdown-body th { padding: 12px 7px; line-height: 24px }
.markdown-body td { min-width: 120px }
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.markdown-body blockquote p { color: rgba(89, 89, 89, 1); line-height: 2 }
.markdown-body ol, .markdown-body ul { color: rgba(89, 89, 89, 1); padding-left: 28px }
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.markdown-body ol li .task-list-item ol, .markdown-body ol li .task-list-item ul, .markdown-body ul li .task-list-item ol, .markdown-body ul li .task-list-item ul { margin-top: 0 }
.markdown-body ol ol, .markdown-body ol ul, .markdown-body ul ol, .markdown-body ul ul { margin-top: 3px }
.markdown-body ol li { padding-left: 6px }
@media (max-width: 720px) { .markdown-body h1 { font-size: 24px } .markdown-body h2 { font-size: 20px } .markdown-body h3 { font-size: 18px } }.markdown-body pre, .markdown-body pre>code.hljs { background: rgba(255, 255, 255, 1); color: rgba(0, 0, 0, 1) }
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简介

Flutter是一种强大的跨平台移动应用程序框架,它能够帮助开发者轻松地创建漂亮、快速、高效的应用程序。本文的主题是如何在Flutter中制作一个长按展示操作项面板的桌面图标。在某些场景下,这个功能会让应用程序更加便利和易用。

Flutter中的桌面图标功能

Flutter提供了一个桌面图标功能,它可以为应用程序添加一个在主屏幕上的图标。这个桌面图标可以通过点击来实现打开应用程序的功能。同时,我们也可以给这个桌面图标添加长按功能,来展示更多的操作项面板。

在实现桌面图标的同时增加长按操作项面板是合理的,因为长按操作在很多移动应用程序中都被广泛使用。例如,在许多电商应用程序中,长按商品可以展示更多的信息,如商品详情、价格、评论等。

Flutter中创建桌面图标的代码如下所示:

import 'dart:io';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter/foundation.dart' show kIsWeb; void createShortcut(BuildContext context) { if (!kIsWeb && (Platform.isAndroid || Platform.isIOS)) {
const platform = MethodChannel('plugins.flutter.io/shared_preferences');
final String result = await platform.invokeMethod('createShortcut');
}
}

打开操作项面板

在Flutter中,我们可以使用ListView和ListTile来创建一个操作项面板。在打开操作项面板之前,我们需要控制其样式和位置。样式可以通过在ListTile中添加ICON和TITLE来修改,位置可以使用showMenu函数设置。

showMenu(
context: context,
position: RelativeRect.fromLTRB(
details.globalPosition.dx,
details.globalPosition.dy,
0,
0
),
items: <PopupMenuEntry>[
const PopupMenuItem(child: Text('操作一')),
const PopupMenuItem(child: Text('操作二')),
const PopupMenuItem(child: Text('操作三')),
],
);

处理操作项面板中的选项

在Flutter中,可以通过添加onSelected回调函数来处理操作项面板中各种选项的点击事件。这个函数会将被选中的操作项的信息传递给你的应用程序。

PopupMenuButton(
itemBuilder: (BuildContext context) =>
<PopupMenuEntry>[
const PopupMenuItem(child: Text('操作一')),
const PopupMenuItem(child: Text('操作二')),
const PopupMenuItem(child: Text('操作三')),
],
onSelected: (result) {
switch (result) {
case '操作一':
// 执行操作一的代码
break;
case '操作二':
// 执行操作二的代码
break;
case '操作三':
// 执行操作三的代码
break;
}
},
)

示例程序

下面是一个完整的Flutter程序,演示如何制作长按展示操作项面板的桌面图标:

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: Scaffold(
appBar: AppBar(
title: const Text('操作项面板示例程序'),
),
body: const Center(
child: Text(
'长按图标以展示操作项面板',
),
),
floatingActionButton: FloatingActionButton(
onPressed: () {
createShortcut(context);
},
tooltip: '创建桌面图标',
child: const Icon(Icons.add),
),
),
);
} Future<void> createShortcut(BuildContext context) async {
showDialog(
context: context,
builder: (BuildContext context) => AlertDialog(
title: const Text("创建操作项面板"),
content: const Text("长按图标以展示操作项面板"),
actions: <Widget>[
TextButton(
onPressed: () {
Navigator.pop(context);
},
child: const Text("取消"),
),
],
)); // 操作项面板
final result = await showMenu(
context: context,
position: RelativeRect.fromLTRB(0, 0, 0, 0),
items: <PopupMenuEntry>[
const PopupMenuItem(child: Text('操作一')),
const PopupMenuItem(child: Text('操作二')),
const PopupMenuItem(child: Text('操作三')),
],
); switch (result) {
case '操作一':
// 执行操作一的代码
break;
case '操作二':
// 执行操作二的代码
break;
case '操作三':
// 执行操作三的代码
break;
}
}
}

这个程序创建了一个主屏幕,并在屏幕中央显示了一条消息。在底部还有一个浮动操作按钮。当用户点击这个浮动操作按钮时,我们会在程序中创建一个AlertDialog,告诉用户长按图标以展示操作项面板。在这个AlertDialog中,我们还添加了一个用于取消操作的按钮。当用户点击这个按钮时,AlertDialog会关闭。

当用户长按桌面图标时,我们使用Flutter的showMenu函数来展示操作项面板。这个函数需要指定一个BuildContext和一个PopupMenuEntry数组作为参数。在我们的程序中,我们使用了三个PopupMenuEntry,每个都是一个简单的弹出菜单项。

当用户选择操作项面板中的任何一个选项时,我们会将信息传递给回调函数。在这个回调函数中,我们可以根据所选的选项执行任何操作。在这个示例程序中,我们只是简单地在switch中判断选择了哪个选项,并在对应的case中执行操作。

总结

通过本文的学习,你应该掌握了如何在Flutter中制作一个长按展示操作项面板的桌面图标。这个功能在许多应用程序中都非常实用。同时,通过这个示例程序的学习,你也应该了解了如何在Flutter中创建AlertDialog、PopupMenuButton和showMenu函数,并学会了如何处理操作项面板中各种选项的点击事件。我希望这篇文章对你有所帮助,并能够激发出更多有趣的创意。

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