flutter_server_box/lib/view/page/setting/seq/srv_seq.dart

import 'dart:ui';
import 'package:fl_lib/fl_lib.dart';
import 'package:flutter/material.dart';
import 'package:server_box/core/extension/context/locale.dart';
import 'package:server_box/data/model/server/server_private_info.dart';
import 'package:server_box/data/provider/server.dart';
import 'package:server_box/data/res/store.dart';

class ServerOrderPage extends StatefulWidget {
  const ServerOrderPage({super.key});

  @override
  State<ServerOrderPage> createState() => _ServerOrderPageState();

  static const route = AppRouteNoArg(page: ServerOrderPage.new, path: '/settings/order/server');
}

class _ServerOrderPageState extends State<ServerOrderPage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: CustomAppBar(title: Text(l10n.serverOrder)),
      body: _buildBody(),
    );
  }

  Widget _proxyDecorator(Widget child, int index, Animation<double> animation) {
    return AnimatedBuilder(
      animation: animation,
      builder: (BuildContext context, Widget? child) {
        final double animValue = Curves.easeInOut.transform(animation.value);
        final double elevation = lerpDouble(1, 6, animValue)!;
        final double scale = lerpDouble(1, 1.02, animValue)!;
        return Transform.scale(
          scale: scale,
          child: Card(elevation: elevation, child: child),
        );
      },
      child: _buildCardTile(index),
    );
  }

  Widget _buildBody() {
    final orders = ServerProvider.serverOrder;
    return orders.listenVal((order) {
      if (order.isEmpty) {
        return Center(child: Text(libL10n.empty));
      }
      return ReorderableListView.builder(
        footer: const SizedBox(height: 77),
        onReorder: (oldIndex, newIndex) {
          setState(() {
            orders.value.move(oldIndex, newIndex, property: Stores.setting.serverOrder);
          });
        },
        padding: const EdgeInsets.all(8),
        buildDefaultDragHandles: false,
        itemBuilder: (_, idx) => _buildItem(idx, order[idx]),
        itemCount: order.length,
        proxyDecorator: _proxyDecorator,
      );
    });
  }

  Widget _buildItem(int index, String id) {
    return ReorderableDelayedDragStartListener(
      key: ValueKey('server_item_$id'),
      index: index,
      child: Padding(
        padding: const EdgeInsets.only(bottom: 8),
        child: CardX(child: _buildCardTile(index)),
      ),
    );
  }

  Widget _buildCardTile(int index) {
    final id = ServerProvider.serverOrder.value[index];
    final spi = ServerProvider.pick(id: id)?.value.spi;
    if (spi == null) {
      return const SizedBox();
    }

    return ListTile(
      title: Text(spi.name, style: const TextStyle(fontWeight: FontWeight.w500)),
      subtitle: Text(spi.oldId, style: UIs.textGrey),
      leading: CircleAvatar(
        backgroundColor: Theme.of(context).colorScheme.primary,
        foregroundColor: Theme.of(context).colorScheme.onPrimary,
        child: Text(spi.name[0]),
      ),
      trailing: ReorderableDragStartListener(index: index, child: const Icon(Icons.drag_handle)),
    );
  }
}