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feat: implement scroll-to-top FAB and enhance library item app bar with scroll listener

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Dr.Blank 2025-04-23 00:22:32 +05:30
parent c3d3a3900d
commit 2cb00c451e
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2 changed files with 130 additions and 8 deletions
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70
lib/features/item_viewer/view/library_item_page.dart
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@ -3,6 +3,7 @@ import 'dart:math';
import 'package:animated_theme_switcher/animated_theme_switcher.dart';
import 'package:flutter/material.dart';
import 'package:flutter_animate/flutter_animate.dart';
import 'package:flutter_hooks/flutter_hooks.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';
import 'package:vaani/api/library_item_provider.dart';
import 'package:vaani/features/item_viewer/view/library_item_sliver_app_bar.dart';
@ -23,19 +24,86 @@ class LibraryItemPage extends HookConsumerWidget {
final String itemId;
final Object? extra;
static const double _showFabThreshold = 300.0;
@override
Widget build(BuildContext context, WidgetRef ref) {
final additionalItemData =
extra is LibraryItemExtras ? extra as LibraryItemExtras : null;
final scrollController = useScrollController();
final showFab = useState(false);
// Effect to listen to scroll changes and update FAB visibility
useEffect(() {
void listener() {
if (!scrollController.hasClients) {
return; // Ensure controller is attached
}
final shouldShow = scrollController.offset > _showFabThreshold;
// Update state only if it changes and widget is still mounted
if (showFab.value != shouldShow && context.mounted) {
showFab.value = shouldShow;
}
}
scrollController.addListener(listener);
// Initial check in case the view starts scrolled (less likely but safe)
WidgetsBinding.instance.addPostFrameCallback((_) {
if (scrollController.hasClients && context.mounted) {
listener();
}
});
// Cleanup: remove the listener when the widget is disposed
return () => scrollController.removeListener(listener);
}, [scrollController],); // Re-run effect if scrollController changes
// --- FAB Scroll-to-Top Logic ---
void scrollToTop() {
if (scrollController.hasClients) {
scrollController.animateTo(
0.0, // Target offset (top)
duration: 300.ms,
curve: Curves.easeInOut,
);
}
}
return ThemeProvider(
initTheme: Theme.of(context),
duration: 200.ms,
child: ThemeSwitchingArea(
child: Scaffold(
floatingActionButton: AnimatedSwitcher(
duration: 250.ms,
// A common transition for FABs (fade + scale)
transitionBuilder: (Widget child, Animation<double> animation) {
return ScaleTransition(
scale: animation,
child: FadeTransition(
opacity: animation,
child: child,
),
);
},
child: showFab.value
? FloatingActionButton(
// Key is important for AnimatedSwitcher to differentiate
key: const ValueKey('fab-scroll-top'),
onPressed: scrollToTop,
tooltip: 'Scroll to top',
child: const Icon(Icons.arrow_upward),
)
: const SizedBox.shrink(
key: ValueKey('fab-empty'),
),
),
body: CustomScrollView(
controller: scrollController,
slivers: [
const LibraryItemSliverAppBar(),
LibraryItemSliverAppBar(
id: itemId,
scrollController: scrollController,
),
SliverPadding(
padding: const EdgeInsets.all(8),
sliver: LibraryItemHeroSection(