nextcloud-neon/packages/neon/neon_dashboard/lib/src/pages/main.dart

import 'dart:math';

import 'package:flutter/material.dart';
import 'package:neon/blocs.dart';
import 'package:neon/theme.dart';
import 'package:neon/utils.dart';
import 'package:neon/widgets.dart';
import 'package:neon_dashboard/l10n/localizations.dart';
import 'package:neon_dashboard/src/blocs/dashboard.dart';
import 'package:neon_dashboard/src/widgets/dry_intrinsic_height.dart';
import 'package:neon_dashboard/src/widgets/widget.dart';
import 'package:neon_dashboard/src/widgets/widget_button.dart';
import 'package:neon_dashboard/src/widgets/widget_item.dart';
import 'package:nextcloud/dashboard.dart' as dashboard;

/// Displays the whole dashboard page layout.
class DashboardMainPage extends StatelessWidget {
  /// Creates a new dashboard main page.
  const DashboardMainPage({
    super.key,
  });

  @override
  Widget build(final BuildContext context) {
    final bloc = NeonProvider.of<DashboardBloc>(context);

    return ResultBuilder.behaviorSubject(
      subject: bloc.widgets,
      builder: (final context, final snapshot) {
        Widget? child;
        if (snapshot.hasData) {
          var minHeight = 504.0;

          final children = <Widget>[];
          for (final widget in snapshot.requireData.entries) {
            final items = buildWidgetItems(
              context: context,
              widget: widget.key,
              items: widget.value,
            ).toList();

            final height = items.map((final i) => i.height!).reduce((final a, final b) => a + b);
            minHeight = max(minHeight, height);

            children.add(
              DashboardWidget(
                widget: widget.key,
                children: items,
              ),
            );
          }

          child = Wrap(
            alignment: WrapAlignment.center,
            spacing: 8,
            runSpacing: 8,
            children: children
                .map(
                  (final widget) => SizedBox(
                    width: 320,
                    height: minHeight + 24,
                    child: widget,
                  ),
                )
                .toList(),
          );
        }

        return Center(
          child: NeonListView.custom(
            scrollKey: 'dashboard',
            isLoading: snapshot.isLoading,
            error: snapshot.error,
            onRefresh: bloc.refresh,
            sliver: SliverFillRemaining(
              hasScrollBody: false,
              child: Center(
                child: child,
              ),
            ),
          ),
        );
      },
    );
  }

  /// Builds the list of messages, [items] and buttons for a [widget].
  @visibleForTesting
  static Iterable<SizedBox> buildWidgetItems({
    required final BuildContext context,
    required final dashboard.Widget widget,
    required final dashboard.WidgetItems? items,
  }) sync* {
    yield SizedBox(
      height: 64,
      child: DryIntrinsicHeight(
        child: ListTile(
          title: Text(
            widget.title,
            style: const TextStyle(
              fontWeight: FontWeight.bold,
            ),
          ),
          leading: SizedBox.square(
            dimension: largeIconSize,
            child: NeonUrlImage(
              url: widget.iconUrl,
              svgColorFilter: ColorFilter.mode(Theme.of(context).colorScheme.primary, BlendMode.srcIn),
              size: const Size.square(largeIconSize),
            ),
          ),
        ),
      ),
    );

    yield const SizedBox(
      height: 20,
    );

    final halfEmptyContentMessage = _buildMessage(items?.halfEmptyContentMessage);
    final emptyContentMessage = _buildMessage(items?.emptyContentMessage);
    if (halfEmptyContentMessage != null) {
      yield halfEmptyContentMessage;
    }
    if (emptyContentMessage != null) {
      yield emptyContentMessage;
    }
    if (halfEmptyContentMessage == null && emptyContentMessage == null && (items?.items.isEmpty ?? true)) {
      yield _buildMessage(DashboardLocalizations.of(context).noEntries)!;
    }

    if (items?.items != null) {
      for (final item in items!.items) {
        yield SizedBox(
          height: 64,
          child: DryIntrinsicHeight(
            child: DashboardWidgetItem(
              item: item,
              roundIcon: widget.itemIconsRound,
            ),
          ),
        );
      }
    }

    yield const SizedBox(
      height: 20,
    );

    if (widget.buttons != null) {
      for (final button in widget.buttons!) {
        yield SizedBox(
          height: 32,
          child: DashboardWidgetButton(
            button: button,
          ),
        );
      }
    }
  }

  static SizedBox? _buildMessage(final String? message) {
    if (message == null || message.isEmpty) {
      return null;
    }

    return SizedBox(
      height: 60,
      child: Center(
        child: Column(
          children: [
            const Icon(
              Icons.check,
              size: largeIconSize,
            ),
            Text(message),
          ],
        ),
      ),
    );
  }
}