Flutter基础widgets教程-RaisedButton篇

1 RaisedButton

RaisedButton组件主要用于文本布局。

2 构造函数

RaisedButton({
    Key key,
    @required VoidCallback onPressed,
    ValueChanged<bool> onHighlightChanged,
    ButtonTextTheme textTheme,
    Color textColor,
    Color disabledTextColor,
    Color color,
    Color disabledColor,
    Color highlightColor,
    Color splashColor,
    Brightness colorBrightness,
    double elevation,
    double highlightElevation,
    double disabledElevation,
    EdgeInsetsGeometry padding,
    ShapeBorder shape,
    Clip clipBehavior = Clip.none,
    MaterialTapTargetSize materialTapTargetSize,
    Duration animationDuration,
    Widget child,
})

3 常用属性

3.1 onPressed

必填参数，按下按钮时触发的回调，接收一个方法，传null表示按钮禁用，会显示禁用相关样式

3.2 textColor：文本颜色

textColor: Colors.white,

3.3 color：按钮颜色

color: Colors.red,

3.4 splashColor：点击按钮时水波纹的颜色

splashColor: Colors.black,

3.5 highlightColor：高亮颜色，点击（长按）按钮后的颜色

highlightColor: Colors.green,

3.6 padding：内边距，其接收值的类型是EdgeInsetsGeometry类型的

3.6.1 一次性设置上下左右的间距

padding: EdgeInsets.all(20),

3.6.2 单独设置

3.6.2.1 上内边距

padding: EdgeInsets.only(top: 30),

3.6.2.2 下内边距

padding: EdgeInsets.only(bottom: 30),

3.6.2.3 左内边距

padding: EdgeInsets.only(left: 30),

3.6.2.4 右内边距

padding: EdgeInsets.only(right: 30),

3.6.3 一次性设置上下左右的间距左上右下顺序设置

padding: EdgeInsets.fromLTRB(0,30,20,40),

3.7 shape：设置按钮的形状

3.7.1 borderRadius：设置圆角

shape: BeveledRectangleBorder(
    side: BorderSide(
        color: Colors.white,
    ),
    borderRadius: BorderRadius.all(Radius.circular(10))
),

3.7.2 BeveledRectangleBorder：带斜角的长方形边框

shape: BeveledRectangleBorder(
    side: BorderSide(
        color: Colors.white,
    ),
    borderRadius: BorderRadius.all(Radius.circular(10))
),

3.7.3 CircleBorder：圆形边框

shape: CircleBorder(
    side: BorderSide(
        color: Colors.white,
    ),
),

3.7.4 RoundedRectangleBorder：圆角矩形

shape: RoundedRectangleBorder(
    borderRadius: BorderRadius.all(Radius.circular(10)),
),

3.7.5 StadiumBorder：两端是半圆的边框

shape: StadiumBorder(),