VLEX/BPM-UI/node_modules/ngx-bootstrap/datepicker/esm2015/engine/format-years-calendar.js

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
import { shiftDate, formatDate } from 'ngx-bootstrap/chronos';
import { createMatrix } from '../utils/matrix-utils';
/** @type {?} */
const height = 4;
/** @type {?} */
const width = 4;
/** @type {?} */
export const yearsPerCalendar = height * width;
/** @type {?} */
export const initialYearShift = (Math.floor(yearsPerCalendar / 2) - 1) * -1;
/** @type {?} */
const shift = { year: 1 };
/**
 * @param {?} viewDate
 * @param {?} formatOptions
 * @param {?=} previousInitialDate
 * @return {?}
 */
export function formatYearsCalendar(viewDate, formatOptions, previousInitialDate) {
    /** @type {?} */
    const initialDate = calculateInitialDate(viewDate, previousInitialDate);
    /** @type {?} */
    const matrixOptions = { width, height, initialDate, shift };
    /** @type {?} */
    const yearsMatrix = createMatrix(matrixOptions, (/**
     * @param {?} date
     * @return {?}
     */
    date => ({
        date,
        label: formatDate(date, formatOptions.yearLabel, formatOptions.locale)
    })));
    /** @type {?} */
    const yearTitle = formatYearRangeTitle(yearsMatrix, formatOptions);
    return {
        years: yearsMatrix,
        monthTitle: '',
        yearTitle
    };
}
/**
 * @param {?} viewDate
 * @param {?=} previousInitialDate
 * @return {?}
 */
function calculateInitialDate(viewDate, previousInitialDate) {
    if (previousInitialDate
        && viewDate.getFullYear() >= previousInitialDate.getFullYear()
        && viewDate.getFullYear() < previousInitialDate.getFullYear() + yearsPerCalendar) {
        return previousInitialDate;
    }
    return shiftDate(viewDate, { year: initialYearShift });
}
/**
 * @param {?} yearsMatrix
 * @param {?} formatOptions
 * @return {?}
 */
function formatYearRangeTitle(yearsMatrix, formatOptions) {
    /** @type {?} */
    const from = formatDate(yearsMatrix[0][0].date, formatOptions.yearTitle, formatOptions.locale);
    /** @type {?} */
    const to = formatDate(yearsMatrix[height - 1][width - 1].date, formatOptions.yearTitle, formatOptions.locale);
    return `${from} - ${to}`;
}
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