build method

@override Widget build(BuildContext context)

Describes the part of the UI represented by this widget.

Implementation

@override
Widget build(BuildContext context) {
  final theme = ThemeScope.of(context);
  final titleStyle = _copyStyle(theme.bodyMedium)
    ..foreground(theme.onSurface)
    ..bold();
  final chevronStyle = _copyStyle(theme.labelMedium)..foreground(theme.muted);

  Widget header = Row(
    gap: 1,
    children: [
      Text(expanded ? 'v' : '>', style: chevronStyle),
      if (leading != null) leading!,
      Text(title, style: titleStyle),
    ],
  );

  if (enabled && onChanged != null) {
    header = GestureDetector(
      onTap: () => onChanged?.call(!expanded),
      child: header,
    );
  }

  final content = Column(
    gap: expanded ? 1 : 0,
    children: [
      header,
      if (expanded)
        Padding(
          padding: padding ?? const EdgeInsets.only(left: 2),
          child: child,
        ),
    ],
  );

  return content;
}