wonders/lib/ui/screens/wonder_details/wonders_details_screen.dart

import 'package:wonders/common_libs.dart';
import 'package:wonders/ui/common/lazy_indexed_stack.dart';
import 'package:wonders/ui/common/measurable_widget.dart';
import 'package:wonders/ui/screens/artifact/artifact_carousel/artifact_carousel_screen.dart';
import 'package:wonders/ui/screens/editorial/editorial_screen.dart';
import 'package:wonders/ui/screens/photo_gallery/photo_gallery.dart';
import 'package:wonders/ui/screens/wonder_details/wonder_details_tab_menu.dart';
import 'package:wonders/ui/screens/wonder_events/wonder_events.dart';

class WonderDetailsScreen extends StatefulWidget with GetItStatefulWidgetMixin {
  WonderDetailsScreen({Key? key, required this.type, this.initialTabIndex = 0}) : super(key: key);
  final WonderType type;
  final int initialTabIndex;

  @override
  State<WonderDetailsScreen> createState() => _WonderDetailsScreenState();
}

class _WonderDetailsScreenState extends State<WonderDetailsScreen> with GetItStateMixin, StatefulPropsMixin {
  late final _tabs = TabControllerProp(
    this,
    length: 4,
    initialIndex: widget.initialTabIndex,
    autoBuild: true,
  );

  final _detailsHasScrolled = ValueNotifier(false);
  double? _tabBarHeight;

  void _handleDetailsScrolled(double scrollPos) => _detailsHasScrolled.value = scrollPos > 0;

  void _handleTabMenuSized(Size size) {
    setState(() => _tabBarHeight = size.height - WonderDetailsTabMenu.buttonInset);
  }

  @override
  Widget build(BuildContext context) {
    final wonder = wondersLogic.getData(widget.type);
    int tabIndex = _tabs.controller.index;
    bool showTabBarBg = tabIndex != 1;
    final tabBarHeight = _tabBarHeight ?? 0;
    return ColoredBox(
      color: Colors.black,
      child: Stack(
        children: [
          /// Fullscreen tab views
          LazyIndexedStack(
            index: _tabs.controller.index,
            children: [
              WonderEditorialScreen(wonder, onScroll: _handleDetailsScrolled),
              PhotoGallery(collectionId: wonder.unsplashCollectionId, wonderType: wonder.type),
              Padding(padding: EdgeInsets.only(bottom: tabBarHeight), child: ArtifactCarouselScreen(type: wonder.type)),
              Padding(padding: EdgeInsets.only(bottom: tabBarHeight), child: WonderEvents(type: widget.type)),
            ],
          ),

          /// Tab menu
          BottomCenter(
            child: ValueListenableBuilder<bool>(
              valueListenable: _detailsHasScrolled,
              builder: (_, value, ___) => MeasurableWidget(
                onChange: _handleTabMenuSized,
                child: WonderDetailsTabMenu(
                  tabController: _tabs.controller,
                  wonderType: wonder.type,
                  showBg: showTabBarBg,
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}