Flutter点状装饰插件dotted_decoration的使用

dotted_decoration

dotted_decoration 是一个自定义装饰，它像 BoxDecoration 一样简单，可以在 Container 小部件中使用以绘制带有点线的分隔符、矩形、椭圆或圆形的虚线边框。

预览

安装

要使用此包，请在 pubspec.yaml 文件中将 dotted_decoration 添加为依赖项。

dependencies:
  dotted_decoration: ^latest_version # 替换为最新版本号

使用方法

创建带有点状装饰的容器

创建一个 Container 小部件，并将 DottedDecoration 分配给其 decoration 属性。

Container(
  decoration: DottedDecoration(),
  child: Text('Dotted Decoration'),
)

绘制线条

DottedDecoration(
  shape: Shape.line,
  linePosition: LinePosition.bottom,
),

添加圆角矩形

DottedDecoration(
  shape: Shape.box,
  borderRadius: BorderRadius.circular(10), // 删除此行以获取平面矩形
),

添加圆形

确保容器的宽度和高度相同以获得完美的圆形，否则它将变成椭圆形。

DottedDecoration(
  shape: Shape.circle,
  dash: [1, 4],
);

参数

形状（Shape）

• shape: Shape.line
• shape: Shape.box
• shape: Shape.oval

线条位置（linePosition）

• linePosition: LinePosition.bottom
• linePosition: LinePosition.left
• linePosition: LinePosition.right
• linePosition: LinePosition.top

虚线模式（dash）

虚线顺序，第一个是虚线长度，第二个是间隔长度。

dash: [2, 5]

线宽（strokeWidth）

线条的宽度。

strokeWidth: 2

颜色（color）

线条的颜色，默认颜色是灰色。

color: Colors.red

示例代码

以下是一个完整的示例代码，展示了如何在应用程序中使用 dotted_decoration 插件：

import 'package:dotted_decoration/dotted_decoration.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key}) : super(key: key);

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

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Dotted Decoration'),
      ),
      body: SingleChildScrollView(
        child: Container(
          padding: EdgeInsets.all(10),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: <Widget>[
              _getDecorationWidget('Line', [
                DottedDecoration(shape: Shape.line, linePosition: LinePosition.bottom),
                DottedDecoration(shape: Shape.line, linePosition: LinePosition.left, color: Colors.red),
                DottedDecoration(shape: Shape.line, linePosition: LinePosition.top, dash: [5, 1]),
                DottedDecoration(shape: Shape.line, linePosition: LinePosition.right)
              ], [
                'Bottom Line',
                'Left Line',
                'Top Line',
                'Right Line'
              ]),
              _getDecorationWidget('Box', [
                DottedDecoration(shape: Shape.box),
                DottedDecoration(shape: Shape.box, borderRadius: BorderRadius.circular(10)),
                DottedDecoration(shape: Shape.box, borderRadius: BorderRadius.only(topLeft: Radius.circular(10)), dash: [2, 5], strokeWidth: 2),
                DottedDecoration(shape: Shape.box, color: Colors.red, strokeWidth: 2),
              ], [
                'Box',
                'Rounded Box',
                'Custom Rounded Box',
                'Colored Box'
              ]),
              _getDecorationWidget('Oval', [
                DottedDecoration(shape: Shape.circle),
                DottedDecoration(shape: Shape.circle, dash: [1, 4]),
              ], [
                'Oval',
                'Oval with dotted outline'
              ])
            ],
          ),
        ),
      ),
    );
  }

  Widget _getDecorationWidget(String title, List<Decoration> decorations, List<String> decorationStrings) {
    return Container(
      padding: EdgeInsets.symmetric(vertical: 10),
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: <Widget>[
          Text(
            title,
            style: TextStyle(color: Colors.black, fontSize: 20),
          ),
          Wrap(
            children: List.generate(
              decorations.length,
                  (index) => Container(
                width: 130,
                margin: EdgeInsets.all(20),
                padding: EdgeInsets.all(20),
                decoration: decorations[index],
                child: Text(
                  decorationStrings[index],
                  style: TextStyle(fontSize: 16),
                ),
              ),
            ),
          )
        ],
      ),
    );
  }
}

通过以上内容，您可以了解如何在Flutter项目中使用dotted_decoration插件来创建不同类型的虚线装饰效果。希望这对您有所帮助！