BadNote/lib/editor/canvas/pen_palette_widgets.dart

// lib/editor/canvas/pen_palette_widgets.dart
//
// Shared Material 3 chrome for the pen-first editors (PDF, note, slide) so the
// floating tool palette looks and behaves identically everywhere — one source
// of truth for the inking UI.

import 'package:flutter/material.dart';

/// A Material 3 toggle-style icon button for the floating tool palette.
class ToolButton extends StatelessWidget {
  const ToolButton({
    super.key,
    required this.icon,
    required this.selected,
    required this.tooltip,
    required this.onPressed,
  });

  final IconData icon;
  final bool selected;
  final String tooltip;

  /// Tap handler. When null the button renders disabled (dimmed, no ripple).
  final VoidCallback? onPressed;

  @override
  Widget build(BuildContext context) {
    final cs = Theme.of(context).colorScheme;
    final enabled = onPressed != null;
    final iconColor = !enabled
        ? cs.onSurfaceVariant.withValues(alpha: 0.38)
        : selected
            ? cs.onSecondaryContainer
            : cs.onSurfaceVariant;
    return Tooltip(
      message: tooltip,
      child: InkWell(
        borderRadius: BorderRadius.circular(20),
        onTap: onPressed,
        child: AnimatedContainer(
          duration: const Duration(milliseconds: 150),
          margin: const EdgeInsets.symmetric(horizontal: 2),
          padding: const EdgeInsets.all(8),
          decoration: BoxDecoration(
            color: selected ? cs.secondaryContainer : Colors.transparent,
            borderRadius: BorderRadius.circular(20),
          ),
          child: Icon(icon, size: 22, color: iconColor),
        ),
      ),
    );
  }
}

/// A thin vertical divider between palette groups.
class PaletteDivider extends StatelessWidget {
  const PaletteDivider({super.key, required this.cs});
  final ColorScheme cs;
  @override
  Widget build(BuildContext context) => Container(
        width: 1,
        height: 24,
        margin: const EdgeInsets.symmetric(horizontal: 6),
        color: cs.outlineVariant,
      );
}

/// A round, tonal icon button (used for the floating back button).
class RoundIconButton extends StatelessWidget {
  const RoundIconButton({
    super.key,
    required this.icon,
    required this.tooltip,
    required this.onPressed,
  });

  final IconData icon;
  final String tooltip;
  final VoidCallback onPressed;

  @override
  Widget build(BuildContext context) {
    final cs = Theme.of(context).colorScheme;
    return Material(
      color: cs.surfaceContainerHigh,
      elevation: 3,
      shape: const CircleBorder(),
      child: IconButton(
        tooltip: tooltip,
        icon: Icon(icon),
        color: cs.onSurfaceVariant,
        onPressed: onPressed,
      ),
    );
  }
}