fox-block-builder
Version:
Maintainable code for loop slack-block-kit-like modal builder
65 lines • 2.01 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.PaginatorStateManager = void 0;
class PaginatorStateManager {
constructor(params) {
const state = PaginatorStateManager.calculateState({
page: Math.floor(params.page) || 1,
totalItems: Math.floor(params.totalItems) || 1,
perPage: Math.floor(params.perPage),
});
this.page = state.page;
this.perPage = state.perPage;
this.totalItems = state.totalItems;
this.totalPages = state.totalPages;
this.offset = state.offset;
}
static calculateState(params) {
const { page, totalItems, perPage } = params;
const totalPages = Math.ceil(totalItems / perPage);
const calculatedPage = PaginatorStateManager.calculatePage(page, totalPages);
const offset = (calculatedPage - 1) * perPage;
return {
totalItems,
perPage,
totalPages,
offset,
page: calculatedPage,
};
}
static calculatePage(page, totalPages) {
if (page < 1) {
return totalPages;
}
return page > totalPages ? 1 : page;
}
getPage() {
return this.page;
}
getTotalPages() {
return this.totalPages;
}
getTotalItems() {
return this.totalItems;
}
getStateByPage(page) {
return PaginatorStateManager.calculateState({
page,
perPage: this.perPage,
totalItems: this.totalItems,
});
}
getNextPageState() {
return this.getStateByPage(this.page + 1);
}
getPreviousPageState() {
return this.getStateByPage(this.page - 1);
}
extractItems(items) {
const beginning = this.offset;
const end = beginning + this.perPage;
return items.slice(beginning, end);
}
}
exports.PaginatorStateManager = PaginatorStateManager;
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