mobile_nebula/lib/components/SimplePage.dart

import 'package:flutter/material.dart';
import 'package:flutter_platform_widgets/flutter_platform_widgets.dart';
import 'package:pull_to_refresh/pull_to_refresh.dart';

enum SimpleScrollable { none, vertical, horizontal, both }

class SimplePage extends StatelessWidget {
  const SimplePage({
    super.key,
    required this.title,
    required this.child,
    this.leadingAction,
    this.trailingActions = const [],
    this.scrollable = SimpleScrollable.vertical,
    this.scrollbar = true,
    this.scrollController,
    this.bottomBar,
    this.onRefresh,
    this.onLoading,
    this.alignment,
    this.refreshController,
  });

  final Widget title;
  final Widget child;
  final SimpleScrollable scrollable;
  final ScrollController? scrollController;
  final AlignmentGeometry? alignment;

  /// Set this to true to force draw a scrollbar without a scroll view, this is helpful for pages with Reorder-able listviews
  /// This is set to true if you have any scrollable other than none
  final bool scrollbar;
  final Widget? bottomBar;

  /// If no leading action is provided then a default "Back" widget than pops the page will be provided
  final Widget? leadingAction;
  final List<Widget> trailingActions;

  final VoidCallback? onRefresh;
  final VoidCallback? onLoading;
  final RefreshController? refreshController;

  @override
  Widget build(BuildContext context) {
    Widget realChild = child;
    var addScrollbar = scrollbar;

    if (scrollable == SimpleScrollable.vertical || scrollable == SimpleScrollable.both) {
      realChild = SingleChildScrollView(
        scrollDirection: Axis.vertical,
        controller: refreshController == null ? scrollController : null,
        child: realChild,
      );
      addScrollbar = true;
    }

    if (scrollable == SimpleScrollable.horizontal || scrollable == SimpleScrollable.both) {
      realChild = SingleChildScrollView(scrollDirection: Axis.horizontal, child: realChild);
      addScrollbar = true;
    }

    if (refreshController != null) {
      realChild = RefreshConfiguration(
        headerTriggerDistance: 100,
        footerTriggerDistance: -100,
        maxUnderScrollExtent: 100,
        child: SmartRefresher(
          scrollController: scrollController,
          onRefresh: onRefresh,
          onLoading: onLoading,
          controller: refreshController!,
          enablePullUp: onLoading != null,
          enablePullDown: onRefresh != null,
          footer: ClassicFooter(loadStyle: LoadStyle.ShowWhenLoading),
          child: realChild,
        ),
      );
      addScrollbar = true;
    }

    if (addScrollbar) {
      realChild = Scrollbar(child: realChild);
    }

    if (alignment != null) {
      realChild = Align(alignment: alignment!, child: realChild);
    }

    if (bottomBar != null) {
      realChild = Column(children: [Expanded(child: realChild), bottomBar!]);
    }

    return PlatformScaffold(
      backgroundColor: Theme.of(context).scaffoldBackgroundColor,
      appBar: PlatformAppBar(
        title: title,
        leading: leadingAction,
        trailingActions: trailingActions,
        cupertino:
            (_, __) => CupertinoNavigationBarData(
              transitionBetweenRoutes: false,
              // TODO: set title on route, show here instead of just "Back"
              previousPageTitle: 'Back',
              padding: EdgeInsetsDirectional.only(end: 8.0),
            ),
      ),
      body: SafeArea(child: realChild),
    );
  }
}