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flutter - 更新 Flutter 后的绘制问题

问题描述

今天，当我更新 Flutter 时，我的绘制方法开始出现错误，以前从未引起任何问题：

@override
void paint(
    PaintingContext context,
    Offset center, {
    Animation<double> activationAnimation,
    Animation<double> enableAnimation,
    bool isDiscrete,
    TextPainter labelPainter,
    RenderBox parentBox,
    SliderThemeData sliderTheme,
    TextDirection textDirection,
    double value,
  }) {

这是错误：

error: 'CustomSlider.paint' ('void Function(PaintingContext, Offset, {Animation<double> activationAnimation, Animation<double> enableAnimation, bool isDiscrete, TextPainter labelPainter, RenderBox parentBox, SliderThemeData sliderTheme, TextDirection textDirection, double value})')
isn't a valid override of 'SliderComponentShape.paint' ('void Function(PaintingContext, Offset, {Animation<double> activationAnimation, Animation<double> enableAnimation, bool isDiscrete, TextPainter labelPainter, RenderBox parentBox, Size sizeWithOverflow, SliderThemeData sliderTheme, TextDirection textDirection, double textScaleFactor, double value})'). 
(invalid_override at [app_name] lib/Home/path_to_file:20)

标签： flutterdart

解决方案

看起来您现在需要在覆盖中指定 sizeWithOverflow：https ://api.flutter.dev/flutter/material/SliderComponentShape/paint.html 我不熟悉该字段，但似乎有一个描述Github 代码中的那个参数：

https://github.com/flutter/flutter/blob/2ae34518b8/packages/flutter/lib/src/material/slider_theme.dart#L1006

因此，您需要将上述内容更改为：

@override
void paint(
    PaintingContext context,
    Offset center, {
    Animation<double> activationAnimation,
    Animation<double> enableAnimation,
    bool isDiscrete,
    TextPainter labelPainter,
    RenderBox parentBox,
    Size sizeWithOverflow, /*The missing link*/
    double textScaleFactor, /*And the missing link I missed*/
    SliderThemeData sliderTheme,
    TextDirection textDirection,
    double value,
  }) {

希望有帮助。

PS 我建议将来使用文本比较工具来更轻松地解决此类问题。我喜欢使用 BeyondCompare，但这就是我。

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