Flutter Text

学习一个Widget的使用最好的办法就是直接看源码的注释,基本的用法里面都介绍清楚了。
在这里插入图片描述
Text有2个构造函数,属性仅仅有9个,非常简单的一个控件。
在这里插入图片描述

1、Text

属性 说明
textAlign 对齐:left、start、right、end、center、justify
textDirection TextDirection.ltr:从左到右、TextDirection.rtl:从右到左
softWrap 是否自动换行
overflow 截取部分展示:clip:直接截取 fade:渐隐 ellipsis:省略号,省略的部分是以单词为单位,而不是字母,比如 hello worddfsa fdafafsasfs ,显示hello …
textScaleFactor 字体缩放
maxLines 显示到最大行数
semanticsLabel 谁知道这个有什么用啊

2、TextStyle

属性 说明
inherit 是否继承父组件的属性,默认true,这个属性极少需要设置为false,设置为false字体默认为白色、10pixels
color 字体颜色,如何设置可以看这:https://blog.csdn.net/mengks1987/article/details/84819431
fontSize (逻辑)字体大小,默认14,是否适配不同屏幕?打个问号需要验证
fontWeight 字体粗细 一般使用的属性:FontWeight normal(默认) 、FontWeight bold(粗体)
fontStyle 字体:normal和italic
fontFamily 设置字体,注意和 fontStyle的区别
letterSpacing 字母间距,默认0,负数间距越小,正数 间距越大
wordSpacing 单词 间距,默认0,负数间距越小,正数 间距越大,注意和letterSpacing的区别,比如hello,h、e、l、l、o各是一个字母,hello是一个单词
textBaseline 字体基线,基线的概念可以看这:https://blog.csdn.net/hanyingjie327/article/details/22799811
height 会乘以fontSize做为行高
locale 设置区域,默认系统的区域
foreground 前置,值是Paint,设置了foreground,color必须为null
background 背景,注意是Paint
shadows 阴影
decoration 文字划线:下划线、上划线、中划线
decorationColor 划线颜色
decorationStyle 划线样式:虚线、双线等

3、textSpan

作用就是一句话显示为不同的样式

Text.rich(
              TextSpan(
                text: 'Hello', //
                children: <TextSpan>[
                  TextSpan(
                      text: ' beautiful ',
                      style: TextStyle(fontStyle: FontStyle.italic)),
                  TextSpan(
                      text: 'world',
                      style: TextStyle(fontWeight: FontWeight.bold)),
                ],
              ),
            )

4、demo

import 'package:flutter/material.dart';

class TextDemo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    var paint = new Paint();
    paint.color = Color(0xFF00FF00);

    var shadowList = [
      new Shadow(color: Color(0xFFFF0000), offset: Offset(3, 3), blurRadius: 3)
    ];

    return Column(
      children: <Widget>[
        Row(
          children: <Widget>[
            Text('inherit=false:'),
            Text(
              'inherit=false',
              style: TextStyle(inherit: false),
            )
          ],
        ),
        Row(
          children: <Widget>[
            Text('字体颜色:'),
            Text(
              '字体颜色是红色',
              style: TextStyle(color: Color(0xFFFF0000)),
            )
          ],
        ),
        Row(
          children: <Widget>[
            Text('字体大小:'),
            Text(
              '字体大小默认',
            ),
            Text(
              '字体大小30',
              style: TextStyle(fontSize: 30),
            )
          ],
        ),
        Row(
          children: <Widget>[
            Text('字体粗细:'),
            Text(
              '默认',
            ),
            Text(
              '粗体',
              style: TextStyle(fontWeight: FontWeight.bold),
            )
          ],
        ),
        Row(
          children: <Widget>[
            Text('字体:'),
            Text(
              '字体-默认',
            ),
            Text(
              '字体-italic',
              style: TextStyle(fontStyle: FontStyle.italic),
            )
          ],
        ),
        Row(
          children: <Widget>[
            Text('字母间距:'),
            Text('字母间距默认'),
            Text(
              '字母间距:-5,absccc',
              style: TextStyle(letterSpacing: -5),
            ),
            Text(
              '字母间距:5,absccc',
              style: TextStyle(letterSpacing: 5),
            )
          ],
        ),
        Row(
          children: <Widget>[
            Text('单词间距:'),
            Text('单词间距默认'),
            Text(
              '单词间距:-5,hello word',
              style: TextStyle(wordSpacing: -5),
            ),
            Text(
              '单词间距:5,hello word',
              style: TextStyle(wordSpacing: 5),
            )
          ],
        ),
        Row(
          children: <Widget>[
            Text('foreground:'),
            Text(
              'Paint 设置颜色为绿色',
              style: TextStyle(foreground: paint),
            )
          ],
        ),
        Row(
          children: <Widget>[
            Text('background:'),
            Text(
              '背景设置为绿色',
              style: TextStyle(background: paint),
            )
          ],
        ),
        Row(
          children: <Widget>[
            Text('阴影:'),
            Text(
              '背景阴影',
              style: TextStyle(
                shadows: shadowList,
              ),
            )
          ],
        ),
        Row(
          children: <Widget>[
            Text('文字划线:'),
            Text(
              '下划线',
              style: TextStyle(
                  decoration: TextDecoration.underline,
                  decorationStyle: TextDecorationStyle.dashed),
            ),
            Text(
              '上划线',
              style: TextStyle(
                  decoration: TextDecoration.overline,
                  decorationStyle: TextDecorationStyle.dotted),
            ),
            Text(
              '中划线',
              style: TextStyle(
                  decoration: TextDecoration.lineThrough,
                  decorationColor: Color(0xFFFF0000),
                  decorationStyle: TextDecorationStyle.double),
            ),
            Text(
              '中划线',
              style: TextStyle(
                  decoration: TextDecoration.lineThrough,
                  decorationColor: Color(0xFFFF0000),
                  decorationStyle: TextDecorationStyle.solid),
            )
          ],
        ),
        Row(
          children: <Widget>[
            Text('对齐方式:'),
            Container(
              width: 300,
              height: 50,
              color: Color(0xFFFF0000),
              child: Text(
                '左对齐',
                textAlign: TextAlign.left,
              ),
            ),
          ],
        ),
        Row(
          children: <Widget>[
            Text('对齐方式:'),
            Container(
              width: 300,
              height: 50,
              color: Color(0xFFFF0000),
              child: Text(
                '右对齐',
                textAlign: TextAlign.right,
              ),
            ),
          ],
        ),
        Row(
          children: <Widget>[
            Text('对齐方式:'),
            Container(
              width: 300,
              height: 50,
              color: Color(0xFFFF0000),
              child: Text(
                '中间对齐',
                textAlign: TextAlign.center,
              ),
            ),
          ],
        ),
        Row(
          children: <Widget>[
            Text('对齐方式:'),
            Container(
              width: 300,
              height: 50,
              color: Color(0xFFFF0000),
              child: Text(
                'hello word \n dfsafdafafsasfs',
                textAlign: TextAlign.justify,
              ),
            ),
          ],
        ),
        Row(
          children: <Widget>[
            Text('方向:'),
            Container(
              width: 300,
              height: 50,
              color: Color(0xFFFF0000),
              child: Text(
                'hello word \n dfsafdafafsasfs',
                textDirection: TextDirection.rtl,
              ),
            ),
          ],
        ),
        Row(
          children: <Widget>[
            Text('overflow:fade'),
            Container(
              width: 100,
              height: 50,
              color: Color(0xFF00FF00),
              child: Text(
                'hello worddfsafdafafsasfs',
                softWrap: false,
                overflow: TextOverflow.fade,
              ),
            ),
          ],
        ),
        Row(
          children: <Widget>[
            Text('overflow:ellipsis'),
            Container(
              width: 100,
              height: 50,
              color: Color(0xFF00FF00),
              child: Text(
                'hello word dfsa fdaf afs asfs',
                softWrap: false,
                overflow: TextOverflow.ellipsis,
              ),
            ),
          ],
        ),
        Row(
          children: <Widget>[
            Text('semanticsLabel:'),
            Container(
              width: 400,
              height: 50,
              color: Color(0xFF00FF00),
              child: Text(r'$$  Double dollars $$',
                  semanticsLabel: 'Double dollars'),
            ),
          ],
        ),
        Row(
          children: <Widget>[
            Text.rich(
              TextSpan(
                text: 'Hello', //
                children: <TextSpan>[
                  TextSpan(
                      text: ' beautiful ',
                      style: TextStyle(fontStyle: FontStyle.italic)),
                  TextSpan(
                      text: 'world',
                      style: TextStyle(fontWeight: FontWeight.bold)),
                ],
              ),
            )
          ],
        )
      ],
    );
  }
}