FreeTLab
b8f078bc14
The functional redesign never touched pluri_bottom_navigation.dart, so the bar kept the old glass + magenta/coral language while every other surface moved on. Rebuilds it to prototype t4/4a: a 52px opaque #0A1B24 pill with a 110x74 balloon raised over the active tab, a teal radial glow behind it, the active item lifted 15px with its label, and inactive items reduced to a 23px icon at 46% opacity. The five tabs and their PluriIconGlyph icons are unchanged, per the standing decision — only the bar's shape, colour and behaviour move. altura and PluriLayout.bottomChromeInset are both asserted against the real laid-out height rather than hardcoded guesses.
300 lines
12 KiB
Dart
300 lines
12 KiB
Dart
import 'package:flutter/material.dart';
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import '../tema/pluriwave_theme.dart';
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import 'pluri_icon.dart';
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class PluriNavItem {
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const PluriNavItem({required this.glyph, required this.label});
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final PluriIconGlyph glyph;
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final String label;
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}
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/// "Barra globo" bottom navigation — Design turn t4, option 4a. Spec
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/// transcribed verbatim from `PluriWave Rediseno.dc.html` lines 91-99: a
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/// solid capsule bar with a taller "balloon" capsule that slides beneath
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/// whichever tab is active. The balloon and the bar share one fill colour
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/// ([PluriWaveTokens.balloonSurface]) so their union reads as a single
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/// inflated shape — same design vocabulary as the prototype's own
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/// `balloon()` helper (`PluriWave Rediseno.dc.html:2130-2155`).
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class PluriBottomNavigation extends StatelessWidget {
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const PluriBottomNavigation({
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super.key,
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required this.items,
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required this.selectedIndex,
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required this.onSelected,
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});
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final List<PluriNavItem> items;
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final int selectedIndex;
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final ValueChanged<int> onSelected;
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/// t4/4a spec: container `height:74px`. Fixed by construction (the root is
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/// a `SizedBox` of this exact height, not content-driven), so this is also
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/// what a real `tester.getSize` measurement returns — see
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/// `pluri_bottom_navigation_test.dart`'s measurement assertion, which
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/// backs `PluriLayout.bottomChromeInset`.
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static const double altura = 74;
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/// t4/4a spec: `width:110px` for the glow/balloon/teal-wash layers,
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/// verbatim — independent of tab count (the prototype's own screen uses 4
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/// cells; this app has 5, so the balloon is wider than one cell and
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/// intentionally overlaps its neighbours, matching the literal spec
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/// numbers rather than rescaling them).
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static const double _balloonWidth = 110;
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/// Test hook for the balloon's own positioned box.
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@visibleForTesting
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static const balloonKey = ValueKey('pluriBottomNavigationBalloon');
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/// Test hook for a given tab's tappable/semantics region.
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@visibleForTesting
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static Key itemKey(int index) => ValueKey('pluriBottomNavigationItem_$index');
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@override
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Widget build(BuildContext context) {
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final t = context.pluriTokens;
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final motion = context.pluriMotion;
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return SizedBox(
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height: altura,
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child: LayoutBuilder(
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builder: (context, constraints) {
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final cellWidth = constraints.maxWidth / items.length;
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final balloonLeft =
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cellWidth * selectedIndex + (cellWidth - _balloonWidth) / 2;
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return Stack(
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clipBehavior: Clip.none,
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children: [
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// Layer 1: radial glow behind the active balloon.
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AnimatedPositioned(
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duration: motion.normal,
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curve: Curves.easeOutCubic,
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left: balloonLeft,
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bottom: -8,
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width: _balloonWidth,
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height: 92,
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child: IgnorePointer(
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child: DecoratedBox(
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// Spec: `border-radius:50%` on a 110x92 box, i.e. an
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// ellipse — Flutter's `BoxShape.circle` only supports
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// equal-radius circles (it would clip this non-square
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// box down to a 92-diameter circle, losing width). The
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// radial gradient already fades to fully transparent at
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// 66% of its radius, well before any box edge, so the
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// rectangular (unclipped) paint area is visually
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// indistinguishable from a true ellipse clip here.
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decoration: BoxDecoration(
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gradient: RadialGradient(
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colors: [
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t.electricMagenta.withValues(alpha: 0.32),
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t.electricMagenta.withValues(alpha: 0),
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],
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stops: const [0, 0.66],
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),
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),
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),
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),
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),
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// Layer 2 (shadow layer): the flat bar and the balloon, both
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// filled with the same solid colour and carrying the same two
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// drop-shadows, so their overlap reads as one union.
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Positioned(
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left: 0,
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right: 0,
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bottom: 0,
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height: 52,
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child: DecoratedBox(
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decoration: BoxDecoration(
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color: t.balloonSurface,
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borderRadius: BorderRadius.circular(999),
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boxShadow: _shellShadows,
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),
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),
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),
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AnimatedPositioned(
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key: balloonKey,
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duration: motion.normal,
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curve: Curves.easeOutCubic,
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left: balloonLeft,
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bottom: 0,
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width: _balloonWidth,
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height: 74,
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child: DecoratedBox(
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decoration: BoxDecoration(
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color: t.balloonSurface,
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borderRadius: BorderRadius.circular(999),
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boxShadow: _shellShadows,
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),
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),
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),
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// Layer 3: teal wash over the balloon only.
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AnimatedPositioned(
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duration: motion.normal,
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curve: Curves.easeOutCubic,
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left: balloonLeft,
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bottom: 0,
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width: _balloonWidth,
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height: 74,
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child: IgnorePointer(
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child: DecoratedBox(
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decoration: BoxDecoration(
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borderRadius: BorderRadius.circular(999),
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gradient: LinearGradient(
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begin: Alignment.topCenter,
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end: Alignment.bottomCenter,
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colors: [
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t.electricMagenta.withValues(alpha: 0.2),
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t.electricMagenta.withValues(alpha: 0),
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],
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stops: const [0, 0.62],
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),
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),
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),
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),
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),
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// Layer 4: the row of items, topmost and interactive. Spans
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// the FULL container height (not just the 52px bar strip) so
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// the active tab's lifted icon/label — which visually pokes
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// up into the balloon's extra headroom — stays within its own
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// tap/semantics region instead of falling through to the
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// (non-interactive) balloon shape behind it.
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Positioned.fill(
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child: Row(
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crossAxisAlignment: CrossAxisAlignment.stretch,
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children: [
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for (var i = 0; i < items.length; i++)
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Expanded(
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key: itemKey(i),
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child: _PluriNavButton(
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item: items[i],
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selected: i == selectedIndex,
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onTap: () => onSelected(i),
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),
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),
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],
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),
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),
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],
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);
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},
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),
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);
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}
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}
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/// t4/4a spec: `drop-shadow(0 -1.5px 0 rgba(255,255,255,.17))` (a hard-edged
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/// rim highlight, zero blur) plus `drop-shadow(0 14px 26px rgba(0,0,0,.5))`
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/// (a soft downward shadow). CSS applies these to the *union* of the bar and
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/// balloon via one shared `filter`; Flutter has no direct primitive for a
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/// shadow-of-a-path-union, so the same two shadows are applied to both
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/// shapes individually — since both are solid, identically-coloured pills,
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/// the balloon's opaque fill already covers the seam where the bar's own
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/// shadow would otherwise show through.
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List<BoxShadow> get _shellShadows => [
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BoxShadow(color: Colors.white.withValues(alpha: 0.17), offset: const Offset(0, -1.5)),
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BoxShadow(
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color: Colors.black.withValues(alpha: 0.5),
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offset: const Offset(0, 14),
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blurRadius: 26,
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),
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];
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class _PluriNavButton extends StatelessWidget {
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const _PluriNavButton({
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required this.item,
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required this.selected,
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required this.onTap,
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});
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final PluriNavItem item;
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final bool selected;
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final VoidCallback onTap;
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@override
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Widget build(BuildContext context) {
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final t = context.pluriTokens;
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return Semantics(
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button: true,
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selected: selected,
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label: item.label,
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child: Material(
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type: MaterialType.transparency,
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child: InkWell(
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onTap: onTap,
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child: Align(
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alignment: Alignment.bottomCenter,
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// t4/4a spec: the items row itself is 52px tall — this inner
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// box reproduces that visual strip even though the outer
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// tappable region now spans the full 74px balloon area.
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child: SizedBox(
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height: 52,
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child: Center(
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// The outer Semantics(button:.., label: item.label) already
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// fully describes this control. Without this, PluriIcon's
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// own inner Semantics(image:true) node (and, for the active
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// tab, Text's auto-generated semantics) has no container
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// boundary to stop it merging into the button's node —
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// Flutter joins merged labels with `\n`, so screen readers
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// would announce "Alarmas\nAlarmas" instead of "Alarmas".
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child: ExcludeSemantics(
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child: Transform.translate(
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// t4/4a spec: active item lift `translateY(-15px)`.
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offset: Offset(0, selected ? -15 : 0),
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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Opacity(
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// t4/4a spec: active icon full colour; inactive
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// `rgba(242,247,250,.46)` — .46 applied here as
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// uniform opacity dims both the fallback Icon
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// (already `onSurface` from
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// PluriIconVariant.filled) and the real raster
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// badge asset identically.
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opacity: selected ? 1 : 0.46,
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child: PluriIcon(
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glyph: item.glyph,
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variant: PluriIconVariant.filled,
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// t4/4a spec: icon `font-size:25px`/`23px`.
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size: selected ? 25 : 23,
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color: selected ? t.electricMagenta : null,
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// Same ARB string the outer Semantics already
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// uses — passing it explicitly skips
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// PluriIcon's own AppLocalizations.of lookup
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// (excluded from the tree above regardless).
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semanticLabel: item.label,
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),
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),
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if (selected) ...[
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const SizedBox(height: 3),
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Text(
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item.label,
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maxLines: 1,
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overflow: TextOverflow.ellipsis,
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// t4/4a spec: label `font-size:11px;
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// font-weight:800; line-height:1.25`, brand
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// colour.
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style: Theme.of(
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context,
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).textTheme.labelSmall?.copyWith(
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fontSize: 11,
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fontWeight: FontWeight.w800,
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height: 1.25,
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letterSpacing: 0,
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color: t.electricMagenta,
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),
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),
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],
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],
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),
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),
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),
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),
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),
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),
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),
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),
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);
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}
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}
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