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addPagination.ts
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addPagination.ts
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import type { BodyRow } from '../bodyRows';
import type { DeriveRowsFn, NewTablePropSet, TablePlugin } from '../types/TablePlugin';
import { derived, writable, type Readable, type Updater, type Writable } from 'svelte/store';
export interface PaginationConfig {
initialPageIndex?: number;
initialPageSize?: number;
serverSide?: boolean;
}
export interface PaginationState {
pageSize: Writable<number>;
pageIndex: Writable<number>;
pageCount: Readable<number>;
serverItemsCount: Writable<number>;
hasPreviousPage: Readable<boolean>;
hasNextPage: Readable<boolean>;
}
const MIN_PAGE_SIZE = 1;
export const createPageStore = ({
items,
initialPageSize,
initialPageIndex,
serverSide,
}: PageStoreConfig) => {
const pageSize = writable(initialPageSize);
const updatePageSize = (fn: Updater<number>) => {
pageSize.update(($pageSize) => {
const newPageSize = fn($pageSize);
return Math.max(newPageSize, MIN_PAGE_SIZE);
});
};
const setPageSize = (newPageSize: number) => updatePageSize(() => newPageSize);
const pageIndex = writable(initialPageIndex);
let pageCount;
function calcPageCount([$pageSize, $itemsCount]: [$pageSize: number, $itemsCount: number]) {
const $pageCount = Math.ceil($itemsCount / $pageSize);
pageIndex.update(($pageIndex) => {
if ($pageCount > 0 && $pageIndex >= $pageCount) {
return $pageCount - 1;
}
return $pageIndex;
});
return $pageCount;
}
const serverItemsCount = writable(0);
if (serverSide) {
pageCount = derived([pageSize, serverItemsCount], calcPageCount);
} else {
const itemCount = derived(items, ($items) => $items.length);
pageCount = derived([pageSize, itemCount], calcPageCount);
}
const hasPreviousPage = derived(pageIndex, ($pageIndex) => {
return $pageIndex > 0;
});
const hasNextPage = derived([pageIndex, pageCount], ([$pageIndex, $pageCount]) => {
return $pageIndex < $pageCount - 1;
});
return {
pageSize: {
subscribe: pageSize.subscribe,
update: updatePageSize,
set: setPageSize,
},
pageIndex,
pageCount,
serverItemsCount,
hasPreviousPage,
hasNextPage,
};
};
export interface PageStoreConfig {
items: Readable<unknown[]>;
initialPageSize?: number;
initialPageIndex?: number;
serverSide?: boolean;
}
export const addPagination =
<Item>({
initialPageIndex = 0,
initialPageSize = 10,
serverSide = false,
}: PaginationConfig = {}): TablePlugin<
Item,
PaginationState,
Record<string, never>,
NewTablePropSet<never>
> =>
() => {
const prePaginatedRows = writable<BodyRow<Item>[]>([]);
const paginatedRows = writable<BodyRow<Item>[]>([]);
const { pageSize, pageIndex, pageCount, serverItemsCount, hasPreviousPage, hasNextPage } =
createPageStore({
items: prePaginatedRows,
initialPageIndex,
initialPageSize,
serverSide,
});
const pluginState: PaginationState = {
pageSize,
pageIndex,
pageCount,
serverItemsCount,
hasPreviousPage,
hasNextPage,
};
const derivePageRows: DeriveRowsFn<Item> = (rows) => {
return derived([rows, pageSize, pageIndex], ([$rows, $pageSize, $pageIndex]) => {
prePaginatedRows.set($rows);
if (!serverSide) {
const startIdx = $pageIndex * $pageSize;
const _paginatedRows = $rows.slice(startIdx, startIdx + $pageSize);
paginatedRows.set(_paginatedRows);
return _paginatedRows;
} else {
paginatedRows.set($rows);
return $rows;
}
});
};
return {
pluginState,
derivePageRows,
};
};