3.2 文字组件封装

3.2 文字组件封装

文本组件封装，实现步骤：

第 1 步：规划组件定义

设计稿样式标准

img

根据设计稿，定义如下

name fontSize fontWeight
title1 24 bold
title2 20 500
title3 15 500
body1 15 500
body2 12 400
body3 9 300

一共 6 种情况，如果需要可以再加，有这个规律，title 主要用在标题偏重，body 用在内容区。

第 2 步：TextWidget 封装

lib/common/widgets/text.dart

参数定义

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import 'package:flutter/material.dart';

/// 文字组件
class TextWidget extends StatelessWidget {
  /// 文字字符串
  final String text;

  /// 样式
  final TextStyle? style;

  /// 颜色
  final Color? color;

  /// 大小
  final double? size;

  /// 重量
  final FontWeight? weight;

  /// 行数
  final int? maxLines;

  /// 自动换行
  final bool? softWrap;

  /// 溢出
  final TextOverflow? overflow;

  /// 对齐方式
  final TextAlign? textAlign;
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const TextWidget({
  Key? key,
  required this.text,
  this.style,
  this.maxLines = 1,
  this.softWrap = false,
  this.overflow = TextOverflow.clip,
  this.color,
  this.size,
  this.weight,
  this.textAlign,
}) : super(key: key);
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@override
Widget build(BuildContext context) {
  if (text == "") {
    return const SizedBox();
  }
  return Text(
    text,
    style: style?.copyWith(
          color: color,
          fontSize: size,
          fontWeight: weight,
        ) ??
        TextStyle(
          color: color,
          fontSize: size,
          fontWeight: weight,
        ),
    overflow: overflow,
    maxLines: maxLines,
    softWrap: softWrap,
    textAlign: textAlign,
  );
}

文字 - 标题 1, 命名构造函数

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/// 文字 - 标题1
const TextWidget.title1(
  this.text, {
  Key? key,
  this.maxLines = 1,
  this.softWrap = false,
  this.overflow = TextOverflow.clip,
  this.color,
  this.size,
  this.weight,
  this.textAlign,
})  : style = const TextStyle(
        fontSize: 24,
        fontWeight: FontWeight.bold,
      ),
      super(key: key);

其它 title body 按上面方式重复

完整代码

lib/common/widgets/text.dart

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import 'package:flutter/material.dart';
import 'package:flutter_woo_commerce_getx_learn/common/index.dart';

/// 文字组件
class TextWidget extends StatelessWidget {
  /// 文字字符串
  final String text;

  /// 样式
  final TextStyle? style;

  /// 颜色
  final Color? color;

  /// 大小
  final double? size;

  /// 重量
  final FontWeight? weight;

  /// 行数
  final int? maxLines;

  /// 自动换行
  final bool? softWrap;

  /// 溢出
  final TextOverflow? overflow;

  /// 对齐方式
  final TextAlign? textAlign;

  const TextWidget({
    Key? key,
    required this.text,
    this.style,
    this.maxLines = 1,
    this.softWrap = false,
    this.overflow = TextOverflow.clip,
    this.color,
    this.size,
    this.weight,
    this.textAlign,
  }) : super(key: key);

  /// 文字 - 标题1
  const TextWidget.title1(
    this.text, {
    Key? key,
    this.maxLines = 1,
    this.softWrap = false,
    this.overflow = TextOverflow.clip,
    this.color,
    this.size,
    this.weight,
    this.textAlign,
  })  : style = const TextStyle(
          fontSize: 24,
          fontWeight: FontWeight.bold,
        ),
        super(key: key);

  /// 文字 - 标题2
  const TextWidget.title2(
    this.text, {
    Key? key,
    this.maxLines = 1,
    this.softWrap = false,
    this.overflow = TextOverflow.clip,
    this.color,
    this.size,
    this.weight,
    this.textAlign,
  })  : style = const TextStyle(
          fontSize: 20,
          fontWeight: FontWeight.w500,
        ),
        super(key: key);

  /// 文字 - 标题3
  const TextWidget.title3(
    this.text, {
    Key? key,
    this.maxLines = 1,
    this.softWrap = false,
    this.overflow = TextOverflow.clip,
    this.color,
    this.size,
    this.weight,
    this.textAlign,
  })  : style = const TextStyle(
          fontSize: 15,
          fontWeight: FontWeight.w500,
        ),
        super(key: key);

  /// 文字 - 正文1
  const TextWidget.body1(
    this.text, {
    Key? key,
    this.maxLines = 1,
    this.softWrap = false,
    this.overflow = TextOverflow.clip,
    this.color,
    this.size,
    this.weight,
    this.textAlign,
  })  : style = const TextStyle(
          fontSize: 15,
          fontWeight: FontWeight.w500,
        ),
        super(key: key);

  /// 文字 - 正文2
  const TextWidget.body2(
    this.text, {
    Key? key,
    this.maxLines = 1,
    this.softWrap = false,
    this.overflow = TextOverflow.clip,
    this.color,
    this.size,
    this.weight,
    this.textAlign,
  })  : style = const TextStyle(
          fontSize: 12,
          fontWeight: FontWeight.w400,
        ),
        super(key: key);

  /// 文字 - 正文3
  const TextWidget.body3(
    this.text, {
    Key? key,
    this.maxLines = 1,
    this.softWrap = false,
    this.overflow = TextOverflow.clip,
    this.color,
    this.size,
    this.weight,
    this.textAlign,
  })  : style = const TextStyle(
          fontSize: 9,
          fontWeight: FontWeight.w300,
        ),
        super(key: key);

  /// 文字 - 按钮
  TextWidget.button({
    Key? key,
    required this.text,
    this.maxLines = 1,
    this.softWrap = false,
    this.overflow = TextOverflow.clip,
    Color? color,
    this.size,
    this.weight,
    this.textAlign,
  })  : color = color ?? AppColors.secondary,
        style = TextStyle(
          fontSize: 14,
          fontWeight: FontWeight.w500,
          color: color,
        ),
        super(key: key);

  /// 文字 - 导航
  const TextWidget.navigation({
    Key? key,
    required this.text,
    this.maxLines = 1,
    this.softWrap = false,
    this.overflow = TextOverflow.clip,
    this.color,
    this.size,
    this.weight,
    this.textAlign,
  })  : style = const TextStyle(
          fontSize: 24,
          fontWeight: FontWeight.w700,
        ),
        super(key: key);

  @override
  Widget build(BuildContext context) {
    if (text == "") {
      return const SizedBox();
    }
    return Text(
      text,
      style: style?.copyWith(
            color: color,
            fontSize: size,
            fontWeight: weight,
          ) ??
          TextStyle(
            color: color,
            fontSize: size,
            fontWeight: weight,
          ),
      overflow: overflow,
      maxLines: maxLines,
      softWrap: softWrap,
      textAlign: textAlign,
    );
  }
}

第 3 步：text 调试界面

lib/pages/styles/styles_index/view.dart

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Widget _buildView() {
  return ListView(
    children: [
      // 文本
      ListTile(
        onTap: () => Get.toNamed(RouteNames.stylesText),
        title: const Text("Text 文本"),
      ),

lib/pages/styles/text/view.dart

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Widget _buildView() {
  return ListView(
    children: const [
      ListTile(title: TextWidget.title1("title1")),
      ListTile(title: TextWidget.title2("title2")),
      ListTile(title: TextWidget.title3("title3")),
      ListTile(title: TextWidget.body1("body1")),
      ListTile(title: TextWidget.body2("body2")),
      ListTile(title: TextWidget.body3("body3")),
    ],
  );
}

最后：运行

img

提交代码到 git