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feat(ui): every app's frame around its tabs, Learn's moved into halkyon_ui

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NavigationFrame is Learn's AppShell without its router and its tabs: a
navigation rail from medium windows on with the app's icon on top,
leading to the first tab, a bar floating above the foot below, the
background of the screen in view around it, and a tick on every choice.
TabsStack is Learn's container of the tabs' navigators, every tab kept
alive and told whether it shows. Learn's shell is built on both, its
tests unchanged; Train's is next.

The rail's icon is drawn from 120 px at most in memory, as Learn's was.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>
This commit is contained in:
Tizian 「ティツィアーン」 2026-10-30 23:52:39 +01:00
commit b45db6ea7c
Signed by: raisondetredev
GPG key ID: 07F6FCF405488B64
2 changed files with 444 additions and 171 deletions
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174
apps/learn/halkyon_learn_flutter/lib/src/core/router/app_shell.dart
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@ -1,26 +1,17 @@
import 'package:flutter/services.dart';
import 'package:go_router/go_router.dart';
import 'package:halkyon_learn_flutter/l10n/app_localizations.dart';
import 'package:halkyon_ui/halkyon_ui.dart';
import 'package:lucide_icons_flutter/lucide_icons.dart';
import 'package:material_ui/material_ui.dart';
/// The frame around the four tabs: a navigation rail at the side from medium
/// windows on, a navigation bar floating above the bottom below that
/// ([FloatingNavigationBar]), the background of the screen in view around
/// it ([ScreenTint]). Every tab keeps its
/// own stack of screens, and the navigation stays visible on all of them;
/// screens that need the whole window are routes outside the shell.
///
/// From medium windows on, the window takes the colour of the screen in view
/// ([ScreenTint], decided 2026-10-10, as Vaia does): the rail sits on it,
/// and the screen is a rounded panel inset on it, with its own wash at the
/// top. Below that, each screen washes its top itself.
/// The frame around the four tabs, every Halkyon app's ([NavigationFrame]):
/// a navigation rail at the side from medium windows on, the kingfisher atop
/// it, and a navigation bar floating above the bottom below that. Every tab
/// keeps its own stack of screens, and the navigation stays visible on all
/// of them; screens that need the whole window are routes outside the shell.
///
/// Choosing the tab that is already selected goes back to its first screen,
/// as Material prescribes. Every choice ticks: the lightest haptic the
/// platform has (a clock tick on Android), where the device has a motor and
/// the system's touch feedback is on.
/// as Material prescribes.
class const AppShell({
/// The tabs' navigators, from `StatefulShellRoute`.
required final StatefulNavigationShell navigationShell,
@ -30,32 +21,17 @@ class const AppShell({
final int Function(BuildContext context)? profileBadge,
/// Whether the navigation bar below medium windows steps aside, for a
/// screen with a bar of its own at the bottom: Material 3 puts the
/// navigation bar on the top-level screens and the actions of those below
/// in a toolbar, never both at once (decided 2026-10-11, as Vaia does). The
/// rail of wider windows stays.
/// screen with a bar of its own at the bottom (decided 2026-10-11,
/// [NavigationFrame.hidesNavigationBar]).
final bool hidesNavigationBar = false,
super.key,
}) extends StatefulWidget {
@override
State<AppShell> createState() => _AppShellState();
}
class _AppShellState() extends State<AppShell> {
final _tint = ScreenTint();
@override
void dispose() {
_tint.dispose();
super.dispose();
}
}) extends StatelessWidget {
@override
Widget build(BuildContext context) {
final navigationShell = widget.navigationShell;
final destinations = _destinations(AppLocalizations.of(context));
final l10n = AppLocalizations.of(context);
final destinations = _destinations(l10n);
// The Profile tab says how many things are new behind it.
final unseen = widget.profileBadge?.call(context) ?? 0;
final unseen = profileBadge?.call(context) ?? 0;
Widget icon(_Destination destination, IconData data) =>
identical(destination, destinations.last)
? Badge.count(
@ -64,116 +40,26 @@ class _AppShellState() extends State<AppShell> {
child: Icon(data),
)
: Icon(data);
if (context.windowSize.isAtLeastMedium) {
return ScreenTintScope(
notifier: _tint,
child: TintFrame(
tint: _tint,
rail: NavigationRail(
backgroundColor: Colors.transparent,
selectedIndex: navigationShell.currentIndex,
labelType: NavigationRailLabelType.all,
onDestinationSelected: _select,
leading: _RailLogo(onTap: () => _select(0)),
destinations: [
for (final destination in destinations)
NavigationRailDestination(
icon: icon(destination, destination.icon),
selectedIcon: icon(destination, destination.selectedIcon),
label: Text(destination.label),
),
],
),
child: navigationShell,
),
);
}
final bar = FloatingNavigationBar(
bar: NavigationBar(
backgroundColor: Colors.transparent,
elevation: 0,
selectedIndex: navigationShell.currentIndex,
onDestinationSelected: _select,
destinations: [
for (final destination in destinations)
NavigationDestination(
icon: icon(destination, destination.icon),
selectedIcon: icon(destination, destination.selectedIcon),
label: destination.label,
),
],
return NavigationFrame(
appName: l10n.appTitle,
// The kingfisher has a white background, which the frame's rounded
// tile keeps reading on light and dark rails alike.
icon: const AssetImage('assets/icon/halkyon_icon.png'),
selectedIndex: navigationShell.currentIndex,
onSelected: (index) => navigationShell.goBranch(
index,
initialLocation: index == navigationShell.currentIndex,
),
);
final surface = Theme.of(context).colorScheme.surface;
return ScreenTintScope(
notifier: _tint,
// Around the bar, the background of the screen in view, changing as
// the frame's colour does.
child: ListenableBuilder(
listenable: _tint,
builder: (context, _) => TweenAnimationBuilder<Color?>(
tween: ColorTween(end: _tint.background ?? surface),
duration: const Duration(milliseconds: 250),
builder: (context, background, _) => Scaffold(
backgroundColor: background,
// The screens run on beneath the floating bar, showing around
// it, as iOS 26's tab bar floats over content; their lists end
// with room for it (the body's bottom padding says how much).
extendBody: !widget.hidesNavigationBar,
body: navigationShell,
// Without the bar, a strip as high as the system's own bar, in
// the screen's background, keeps every screen inside clear of
// it.
bottomNavigationBar: widget.hidesNavigationBar
? SizedBox(height: MediaQuery.paddingOf(context).bottom)
: bar,
hidesNavigationBar: hidesNavigationBar,
destinations: [
for (final destination in destinations)
(
label: destination.label,
icon: icon(destination, destination.icon),
selectedIcon: icon(destination, destination.selectedIcon),
),
),
),
);
}
void _select(int index) {
HapticFeedback.selectionClick();
widget.navigationShell.goBranch(
index,
initialLocation: index == widget.navigationShell.currentIndex,
);
}
}
/// The kingfisher atop the rail, leading Home ([onTap]) as a website's
/// logo does. The icon has a white background, so it sits in a rounded tile
/// that reads on light and dark rails alike.
class const _RailLogo({required final VoidCallback onTap})
extends StatelessWidget {
@override
Widget build(BuildContext context) {
final l10n = AppLocalizations.of(context);
return Padding(
padding: const EdgeInsets.symmetric(vertical: 12),
child: Tooltip(
message: l10n.shellTabHome,
child: Material(
type: MaterialType.transparency,
child: InkWell(
onTap: onTap,
borderRadius: BorderRadius.circular(9),
child: ClipRRect(
borderRadius: BorderRadius.circular(9),
child: Image.asset(
'assets/icon/halkyon_icon.png',
width: 40,
height: 40,
// The source is 1024 px square; a 40 dp logo needs no more
// than this in memory, even at three times the density.
cacheWidth: 120,
semanticLabel: l10n.appTitle,
),
),
),
),
),
],
child: navigationShell,
);
}
}

23
apps/learn/halkyon_learn_flutter/lib/src/core/router/tab_visibility.dart
View file

@ -2,27 +2,10 @@ import 'package:go_router/go_router.dart';
import 'package:halkyon_ui/halkyon_ui.dart';
import 'package:material_ui/material_ui.dart';
/// The container of the tabs' navigators for a `StatefulShellRoute`, as
/// go_router's indexed stack builds it: every tab stays alive, the hidden
/// ones offstage with their animations paused. Each also learns from
/// [TabVisibility] whether it shows.
/// The container of the tabs' navigators for a `StatefulShellRoute`:
/// halkyon_ui's [TabsStack], every tab alive and learning whether it shows.
Widget tabsContainer(
BuildContext context,
StatefulNavigationShell shell,
List<Widget> tabs,
) => IndexedStack(
index: shell.currentIndex,
children: [
for (final (index, tab) in tabs.indexed)
Offstage(
offstage: index != shell.currentIndex,
child: TickerMode(
enabled: index == shell.currentIndex,
child: TabVisibility(
visible: index == shell.currentIndex,
child: tab,
),
),
),
],
);
) => TabsStack(index: shell.currentIndex, children: tabs);