Flutter开发之——FlutterLogo

发表于 2021-03-23 分类于开发， F-跨平台， Flutter 阅读时长 ≈ 1 分钟

一概述

FlutterLogo是Flutter中用于显示系统图标的组件
FlutterLogo是一个动画控件(AnimatedContainer实现)

二 Flutter的常用属性

2.1 FlutterLogo构造方法

const FlutterLogo({
  Key? key,
  this.size,
  this.textColor = const Color(0xFF757575),
  this.style = FlutterLogoStyle.markOnly,
  this.duration = const Duration(milliseconds: 750),
  this.curve = Curves.fastOutSlowIn,
}) : assert(textColor != null),
     assert(style != null),
     assert(duration != null),
     assert(curve != null),
     super(key: key);

2.2 属性说明

属性名	说明	取值
size	设置图标的尺寸大小	Double对象
textColor	设置文本颜色	Color对象
style	设置图标的风格	FlutterLogoStyle对象
duration	设置当颜色、风格等变化发生时的动画时间	Duration对象
curve	当style或textColor变化时曲线	Curve对象

FlutterLogoStyle说明

取值	说明
markOnly	仅仅展示图标
horizontal	水平展示图标和文本(图标在左，文字在右)
stacked	水平展示图标和文本(图标在上，文字在下)

Duration说明

const Duration(
    {int days = 0,
    int hours = 0,
    int minutes = 0,
    int seconds = 0,
    int milliseconds = 0,
    int microseconds = 0})
    : this._microseconds(microsecondsPerDay * days +
          microsecondsPerHour * hours +
          microsecondsPerMinute * minutes +
          microsecondsPerSecond * seconds +
          microsecondsPerMillisecond * milliseconds +
          microseconds);

取值	说明
days	几天
hours	几个小时
minutes	几分钟
seconds	几秒钟
milliseconds	毫秒
microseconds	微妙

1	duration: Duration(days: 1,hours: 1, minutes: 1, seconds: 1,milliseconds: 1,microseconds: 1,),

三示例

3.1 代码

var _style = FlutterLogoStyle.horizontal;
body: Column(
        children: <Widget>[
          FlutterLogo(
            size: 160,
            style: _style,
            textColor: Colors.cyan,
            duration: Duration(seconds: 1,milliseconds: 1,),
            curve: Curves.decelerate,
          ),
          RaisedButton(
            child: Text("切换FlutterLogoStyle"),
            onPressed: (){
              setState(() {
                _style = FlutterLogoStyle.stacked;
              });
            },
          ),
        ],
      )

3.2 效果图

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