car-interface-android/lib/features/home/widgets/shortcut_grid.dart

import 'dart:math' as math;

import 'package:flutter/material.dart';

import 'shortcut_tile.dart';

class ShortcutSpec {
  const ShortcutSpec({
    required this.title,
    required this.subtitle,
    required this.iconAsset,
    required this.assigned,
    required this.onTap,
    this.onLongPress,
    this.longPressHint,
  });

  final String title;
  final String? subtitle;
  final String iconAsset;
  final bool assigned;
  final VoidCallback onTap;
  final VoidCallback? onLongPress;
  final String? longPressHint;
}

/// Fits up to 16 home shortcuts. Columns and tile size are chosen together so
/// the whole set stays visible and grows denser as apps are added.
class ShortcutGrid extends StatelessWidget {
  const ShortcutGrid({
    super.key,
    required this.shortcuts,
    required this.compact,
  });

  final List<ShortcutSpec> shortcuts;
  final bool compact;

  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(
      builder: (context, constraints) {
        if (!constraints.hasBoundedWidth || !constraints.hasBoundedHeight) {
          return const SizedBox.shrink();
        }

        if (shortcuts.isEmpty) return const SizedBox.shrink();

        final dense = shortcuts.length > 8;
        final horizontalGap = dense
            ? (compact ? 10.0 : 14.0)
            : (compact ? 18.0 : 24.0);
        final rowGap = dense
            ? (compact ? 12.0 : 16.0)
            : (compact ? 18.0 : 26.0);
        final labelAllowance = compact ? 46.0 : 50.0;
        final maxTileSize = compact ? 168.0 : 196.0;

        var bestSize = 0.0;
        for (var columns = 2; columns <= 6; columns++) {
          if (columns > shortcuts.length) break;
          final rows = (shortcuts.length / columns).ceil();
          final widthLimited =
              (constraints.maxWidth - horizontalGap * (columns - 1)) / columns;
          final heightLimited =
              (constraints.maxHeight - rowGap * (rows - 1)) / rows -
              labelAllowance;
          final candidate = math
              .min(widthLimited, heightLimited)
              .clamp(0.0, maxTileSize);
          if (candidate > bestSize) bestSize = candidate;
        }

        final size = bestSize.clamp(64.0, maxTileSize);

        return Center(
          child: Wrap(
            alignment: WrapAlignment.center,
            crossAxisAlignment: WrapCrossAlignment.start,
            spacing: horizontalGap,
            runSpacing: rowGap,
            children: [
              for (final shortcut in shortcuts)
                ShortcutTile(
                  title: shortcut.title,
                  subtitle: shortcut.subtitle,
                  iconAsset: shortcut.iconAsset,
                  size: size,
                  assigned: shortcut.assigned,
                  onTap: shortcut.onTap,
                  onLongPress: shortcut.onLongPress,
                  longPressHint: shortcut.longPressHint,
                ),
            ],
          ),
        );
      },
    );
  }
}