Function makePaginator

components/dash-table/src/dash-table/derived/paginator.ts:29–102

(params: IPaginatorParams | null)

}

function makePaginator(params: IPaginatorParams | null): IPaginator {
    if (params === null) {
        return {
            loadNext() {},
            loadPrevious() {},
            loadFirst() {},
            loadLast() {},
            loadPage() {},
            hasPrevious() {
                return true;
            },
            hasNext() {
                return true;
            },
            isLast() {
                return false;
            },
            lastPage: undefined
        };
    }

    const {setProps, page_count} = params;
    let {page_current} = params;

    if (page_count && page_count - 1 < page_current) {
        page_current = 0;
        updatePage();
    }

    function updatePage() {
        setProps({
            page_current,
            ...clearSelection
        });
    }

    function loadPage(page: number) {
        page = Math.max(0, page);
        page = page_count ? Math.min(page_count - 1, page) : page;

        page_current = page;
        updatePage();
    }

    return {
        loadNext: () => loadPage(page_current + 1),

        loadPrevious: () => loadPage(page_current - 1),

        loadFirst: () => loadPage(0),

        loadPage,

        loadLast: () => {
            if (page_count) {
                loadPage(page_count - 1);
            }
        },