textElevation method

T textElevation(
  1. double elevation, {
  2. double angle = 0.0,
  3. Color color = const Color(0x33000000),
  4. double opacityRatio = 1.0,
})

为文本添加立体效果

参数:

  • elevation: 立体效果的高度
  • angle: 阴影的角度，默认为 0.0
  • color: 阴影颜色，默认为半透明黑色
  • opacityRatio: 不透明度比率，默认为 1.0

返回: 应用了立体效果的 TextSpan 对象

Implementation

T textElevation(
  double elevation, {
  double angle = 0.0,
  Color color = const Color(0x33000000),
  double opacityRatio = 1.0,
}) {
  final double calculatedOpacity =
      _elevationOpacityCurve(elevation) * opacityRatio;

  final Shadow shadow = Shadow(
    color: color.withOpacity(calculatedOpacity),
    blurRadius: elevation,
    offset: Offset(sin(angle) * elevation, cos(angle) * elevation),
  );
  return this.copyWith(
    style: (style ?? const TextStyle()).copyWith(
      shadows: [
        shadow,
      ],
    ),
  );
}