app-flutter/lib/widgets/stat_box.dart

// The boxed-widget pattern from smart-serow's HUD (pi/ui/lib/widgets/stat_box*.dart):
// every readout is a box that takes its share of a row (`flex`) and sizes its type
// from its own height, so a layout is a grid of boxes, and a value changing digits
// never moves anything. Value in foreground with tabular figures, unit and label in
// subdued; a warning turns the value to alarm.
//
// Added for Yukart: [dim]. A missing or stale value is a normal state in a car
// (app guideline 2), shown in subdued rather than hidden.

import 'package:flutter/material.dart';

import '../theme/palette.dart';

/// A labeled stat box: the small one, for rows of readouts.
class StatBox extends StatelessWidget {
  const StatBox({
    super.key,
    required this.value,
    this.unit,
    required this.label,
    this.flex = 1,
    this.isWarning,
    this.dim = false,
  });

  final String value;
  final String? unit;
  final String label;
  final int flex;

  /// If it returns true, the value shows in alarm.
  final bool Function()? isWarning;

  /// Missing or stale: the value shows in subdued.
  final bool dim;

  @override
  Widget build(BuildContext context) {
    final theme = AppTheme.of(context);
    final warning = isWarning?.call() ?? false;
    final valueColor = dim
        ? theme.subdued
        : warning
        ? theme.alarm
        : theme.foreground;

    return Expanded(
      flex: flex,
      child: LayoutBuilder(
        builder: (context, constraints) {
          final baseSize = constraints.maxHeight * 0.4;

          // Shrinks (never wraps) when a label is wider than its box.
          return Center(
            child: FittedBox(
              fit: BoxFit.scaleDown,
              child: Column(
                mainAxisSize: MainAxisSize.min,
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  // Value + optional unit
                  Row(
                    mainAxisAlignment: MainAxisAlignment.center,
                    crossAxisAlignment: CrossAxisAlignment.baseline,
                    textBaseline: TextBaseline.alphabetic,
                    children: [
                      Text(
                        value,
                        style: TextStyle(
                          fontFamily: hudFont,
                          fontSize: baseSize,
                          fontWeight: FontWeight.w400,
                          fontFeatures: const [FontFeature.tabularFigures()],
                          color: valueColor,
                          height: 1,
                        ),
                      ),
                      SizedBox(width: baseSize * 0.1),
                      if (unit != null) ...[
                        const SizedBox(width: 4),
                        Text(
                          unit!,
                          style: TextStyle(
                            fontFamily: hudFont,
                            fontSize: baseSize * 0.5,
                            fontWeight: FontWeight.w400,
                            color: theme.subdued,
                            height: 1,
                          ),
                        ),
                      ],
                    ],
                  ),
                  SizedBox(height: baseSize * 0.1),
                  // Label
                  Text(
                    label,
                    style: TextStyle(
                      fontFamily: hudFont,
                      fontSize: baseSize * 0.6,
                      fontWeight: FontWeight.w400,
                      color: theme.subdued,
                      letterSpacing: 1,
                    ),
                  ),
                ],
              ),
            ),
          );
        },
      ),
    );
  }
}

/// The large stat box, for the main area. Fixed-size: content changes don't move the layout.
class StatBoxMain extends StatelessWidget {
  const StatBoxMain({
    super.key,
    required this.value,
    this.unit,
    required this.label,
    this.flex = 1,
    this.isWarning,
    this.dim = false,
  });

  final String value;
  final String? unit;
  final String label;
  final int flex;
  final bool Function()? isWarning;
  final bool dim;

  @override
  Widget build(BuildContext context) {
    final theme = AppTheme.of(context);
    final warning = isWarning?.call() ?? false;

    return Expanded(
      flex: flex,
      child: LayoutBuilder(
        builder: (context, constraints) {
          // Scale fonts relative to box height for consistent proportions
          final baseSize = constraints.maxHeight * 0.4;

          // Shrinks (never wraps) when a label is wider than its box.
          return Center(
            child: FittedBox(
              fit: BoxFit.scaleDown,
              child: Column(
                mainAxisSize: MainAxisSize.min,
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  // Value + optional unit row
                  Row(
                    mainAxisAlignment: MainAxisAlignment.center,
                    crossAxisAlignment: CrossAxisAlignment.baseline,
                    textBaseline: TextBaseline.alphabetic,
                    children: [
                      Text(
                        value,
                        style: TextStyle(
                          fontFamily: hudFont,
                          fontSize: baseSize,
                          fontWeight: FontWeight.w300,
                          fontFeatures: const [FontFeature.tabularFigures()],
                          color: dim
                              ? theme.subdued
                              : warning
                              ? theme.alarm
                              : theme.foreground,
                          height: 1,
                        ),
                      ),
                      if (unit != null) ...[
                        const SizedBox(width: 8),
                        Text(
                          unit!,
                          style: TextStyle(
                            fontFamily: hudFont,
                            fontSize: baseSize * 0.4,
                            fontWeight: FontWeight.w400,
                            color: theme.subdued,
                            height: 1,
                          ),
                        ),
                      ],
                    ],
                  ),
                  SizedBox(height: baseSize * 0.1),
                  // Label
                  Text(
                    label,
                    style: TextStyle(
                      fontFamily: hudFont,
                      fontSize: baseSize * 0.35,
                      fontWeight: FontWeight.w400,
                      color: theme.subdued,
                      letterSpacing: 2,
                    ),
                  ),
                ],
              ),
            ),
          );
        },
      ),
    );
  }
}