Content list controller

contentListController.dart

import 'package:flutter/material.dart';

class ContentListController {
  ContentListController({
    this.onPressed,
    this.onLoadMore,
    this.onRefresh,
    this.onSearch,
    this.onFilter,
    this.onSort,
  });

  final List<Widget> _items = const [];

  final VoidCallback? onLoadMore;

  final Function<T>(T item)? onPressed;
  final Function()? onRefresh;
  final Function<T>(T query)? onSearch;
  final Function<T>(T filters)? onFilter;
  final Function<T>(T sort)? onSort;

  final ValueNotifier<List<Widget>> itemsNotifier = ValueNotifier<List<Widget>>(
    [],
  );

  List<Widget> get items => _items;

  void updateItems(List<Widget> items) {
    itemsNotifier.value = items;
  }

  void addItems(List<Widget> items) {
    final updated = Set<Widget>.from(itemsNotifier.value)..addAll(items);
    itemsNotifier.value = updated.toList();
  }

  void removeItems(List<Widget> itemsToRemove) {
    final updated =
        itemsNotifier.value
            .where((item) => !itemsToRemove.contains(item))
            .toList();
    itemsNotifier.value = updated;
  }

  void clearItems() {
    itemsNotifier.value = [];
  }

  void dispose() => itemsNotifier.dispose();

  void refresh() => onRefresh?.call();

  void loadMore() => onLoadMore?.call();

  void search<T>(T query) => onSearch?.call(query);

  void filter<T>(T filters) => onFilter?.call(filters);

  void sort<T>(T sort) => onSort?.call(sort);

  void onItemPressed<T>(T item) => onPressed?.call(item);
}