react-native-ultimate-paginator/dist/utils/pagination.js

A comprehensive pagination library supporting various pagination scenarios including server-side, client-side, infinite scroll, and load-more functionality

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.calculatePagination = calculatePagination;
exports.generatePageNumbers = generatePageNumbers;
exports.getPageItems = getPageItems;
function calculatePagination(options) {
    var totalItems = options.totalItems, currentPage = options.currentPage, pageSize = options.pageSize;
    var totalPages = Math.ceil(totalItems / pageSize);
    var normalizedCurrentPage = Math.max(1, Math.min(currentPage, totalPages));
    var startIndex = (normalizedCurrentPage - 1) * pageSize;
    var endIndex = Math.min(startIndex + pageSize, totalItems);
    return {
        currentPage: normalizedCurrentPage,
        totalPages: totalPages,
        pageSize: pageSize,
        totalItems: totalItems,
        hasNextPage: normalizedCurrentPage < totalPages,
        hasPreviousPage: normalizedCurrentPage > 1,
        startIndex: startIndex,
        endIndex: endIndex
    };
}
function generatePageNumbers(currentPage, totalPages, maxPages) {
    if (maxPages === void 0) { maxPages = 5; }
    var pages = [];
    var halfMaxPages = Math.floor(maxPages / 2);
    var startPage = Math.max(currentPage - halfMaxPages, 1);
    var endPage = Math.min(startPage + maxPages - 1, totalPages);
    if (endPage - startPage + 1 < maxPages) {
        startPage = Math.max(endPage - maxPages + 1, 1);
    }
    for (var i = startPage; i <= endPage; i++) {
        pages.push(i);
    }
    return pages;
}
function getPageItems(items, currentPage, pageSize) {
    var startIndex = (currentPage - 1) * pageSize;
    return items.slice(startIndex, startIndex + pageSize);
}