@herculesproject/datetime-picker
Version:
Angular Material Datetime Picker
491 lines • 46.5 kB
JavaScript
/**
* @fileoverview added by tsickle
* Generated from: lib/multi-year-view.ts
* @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingRequire,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { DOWN_ARROW, END, ENTER, HOME, LEFT_ARROW, PAGE_DOWN, PAGE_UP, RIGHT_ARROW, UP_ARROW, SPACE, } from '@angular/cdk/keycodes';
import { ChangeDetectionStrategy, ChangeDetectorRef, Component, EventEmitter, Input, Optional, Output, ViewChild, ViewEncapsulation, } from '@angular/core';
import { Directionality } from '@angular/cdk/bidi';
import { Subscription } from 'rxjs';
import { startWith } from 'rxjs/operators';
import { DateRange } from '@angular/material/datepicker';
import { NgxMatCalendarCell, NgxMatCalendarBody } from './calendar-body';
import { NgxMatDateAdapter } from './core/date-adapter';
import { createMissingDateImplError } from './utils/date-utils';
/** @type {?} */
export const yearsPerPage = 24;
/** @type {?} */
export const yearsPerRow = 4;
/**
* An internal component used to display a year selector in the datepicker.
* \@docs-private
* @template D
*/
export class NgxMatMultiYearView {
/**
* @param {?} _changeDetectorRef
* @param {?} _dateAdapter
* @param {?=} _dir
*/
constructor(_changeDetectorRef, _dateAdapter, _dir) {
this._changeDetectorRef = _changeDetectorRef;
this._dateAdapter = _dateAdapter;
this._dir = _dir;
this._rerenderSubscription = Subscription.EMPTY;
/**
* Emits when a new year is selected.
*/
this.selectedChange = new EventEmitter();
/**
* Emits the selected year. This doesn't imply a change on the selected date
*/
this.yearSelected = new EventEmitter();
/**
* Emits when any date is activated.
*/
this.activeDateChange = new EventEmitter();
if (!this._dateAdapter) {
throw createMissingDateImplError('NgxMatDateAdapter');
}
this._activeDate = this._dateAdapter.today();
}
/**
* The date to display in this multi-year view (everything other than the year is ignored).
* @return {?}
*/
get activeDate() { return this._activeDate; }
/**
* @param {?} value
* @return {?}
*/
set activeDate(value) {
/** @type {?} */
let oldActiveDate = this._activeDate;
/** @type {?} */
const validDate = this._getValidDateOrNull(this._dateAdapter.deserialize(value)) || this._dateAdapter.today();
this._activeDate = this._dateAdapter.clampDate(validDate, this.minDate, this.maxDate);
if (!isSameMultiYearView(this._dateAdapter, oldActiveDate, this._activeDate, this.minDate, this.maxDate)) {
this._init();
}
}
/**
* The currently selected date.
* @return {?}
*/
get selected() { return this._selected; }
/**
* @param {?} value
* @return {?}
*/
set selected(value) {
if (value instanceof DateRange) {
this._selected = value;
}
else {
this._selected = this._getValidDateOrNull(this._dateAdapter.deserialize(value));
}
this._setSelectedYear(value);
}
/**
* The minimum selectable date.
* @return {?}
*/
get minDate() { return this._minDate; }
/**
* @param {?} value
* @return {?}
*/
set minDate(value) {
this._minDate = this._getValidDateOrNull(this._dateAdapter.deserialize(value));
}
/**
* The maximum selectable date.
* @return {?}
*/
get maxDate() { return this._maxDate; }
/**
* @param {?} value
* @return {?}
*/
set maxDate(value) {
this._maxDate = this._getValidDateOrNull(this._dateAdapter.deserialize(value));
}
/**
* @return {?}
*/
ngAfterContentInit() {
this._rerenderSubscription = this._dateAdapter.localeChanges
.pipe(startWith(null))
.subscribe((/**
* @return {?}
*/
() => this._init()));
}
/**
* @return {?}
*/
ngOnDestroy() {
this._rerenderSubscription.unsubscribe();
}
/**
* Initializes this multi-year view.
* @return {?}
*/
_init() {
this._todayYear = this._dateAdapter.getYear(this._dateAdapter.today());
// We want a range years such that we maximize the number of
// enabled dates visible at once. This prevents issues where the minimum year
// is the last item of a page OR the maximum year is the first item of a page.
// The offset from the active year to the "slot" for the starting year is the
// *actual* first rendered year in the multi-year view.
/** @type {?} */
const activeYear = this._dateAdapter.getYear(this._activeDate);
/** @type {?} */
const minYearOfPage = activeYear - getActiveOffset(this._dateAdapter, this.activeDate, this.minDate, this.maxDate);
this._years = [];
for (let i = 0, row = []; i < yearsPerPage; i++) {
row.push(minYearOfPage + i);
if (row.length == yearsPerRow) {
this._years.push(row.map((/**
* @param {?} year
* @return {?}
*/
year => this._createCellForYear(year))));
row = [];
}
}
this._changeDetectorRef.markForCheck();
}
/**
* Handles when a new year is selected.
* @param {?} event
* @return {?}
*/
_yearSelected(event) {
/** @type {?} */
const year = event.value;
this.yearSelected.emit(this._dateAdapter.createDate(year, 0, 1));
/** @type {?} */
let month = this._dateAdapter.getMonth(this.activeDate);
/** @type {?} */
let daysInMonth = this._dateAdapter.getNumDaysInMonth(this._dateAdapter.createDate(year, month, 1));
this.selectedChange.emit(this._dateAdapter.createDate(year, month, Math.min(this._dateAdapter.getDate(this.activeDate), daysInMonth)));
}
/**
* Handles keydown events on the calendar body when calendar is in multi-year view.
* @param {?} event
* @return {?}
*/
_handleCalendarBodyKeydown(event) {
/** @type {?} */
const oldActiveDate = this._activeDate;
/** @type {?} */
const isRtl = this._isRtl();
switch (event.keyCode) {
case LEFT_ARROW:
this.activeDate = this._dateAdapter.addCalendarYears(this._activeDate, isRtl ? 1 : -1);
break;
case RIGHT_ARROW:
this.activeDate = this._dateAdapter.addCalendarYears(this._activeDate, isRtl ? -1 : 1);
break;
case UP_ARROW:
this.activeDate = this._dateAdapter.addCalendarYears(this._activeDate, -yearsPerRow);
break;
case DOWN_ARROW:
this.activeDate = this._dateAdapter.addCalendarYears(this._activeDate, yearsPerRow);
break;
case HOME:
this.activeDate = this._dateAdapter.addCalendarYears(this._activeDate, -getActiveOffset(this._dateAdapter, this.activeDate, this.minDate, this.maxDate));
break;
case END:
this.activeDate = this._dateAdapter.addCalendarYears(this._activeDate, yearsPerPage - getActiveOffset(this._dateAdapter, this.activeDate, this.minDate, this.maxDate) - 1);
break;
case PAGE_UP:
this.activeDate =
this._dateAdapter.addCalendarYears(this._activeDate, event.altKey ? -yearsPerPage * 10 : -yearsPerPage);
break;
case PAGE_DOWN:
this.activeDate =
this._dateAdapter.addCalendarYears(this._activeDate, event.altKey ? yearsPerPage * 10 : yearsPerPage);
break;
case ENTER:
case SPACE:
this._yearSelected({ value: this._dateAdapter.getYear(this._activeDate), event });
break;
default:
// Don't prevent default or focus active cell on keys that we don't explicitly handle.
return;
}
if (this._dateAdapter.compareDate(oldActiveDate, this.activeDate)) {
this.activeDateChange.emit(this.activeDate);
}
this._focusActiveCell();
// Prevent unexpected default actions such as form submission.
event.preventDefault();
}
/**
* @return {?}
*/
_getActiveCell() {
return getActiveOffset(this._dateAdapter, this.activeDate, this.minDate, this.maxDate);
}
/**
* Focuses the active cell after the microtask queue is empty.
* @return {?}
*/
_focusActiveCell() {
this._matCalendarBody._focusActiveCell();
}
/**
* Creates an MatCalendarCell for the given year.
* @private
* @param {?} year
* @return {?}
*/
_createCellForYear(year) {
/** @type {?} */
let yearName = this._dateAdapter.getYearName(this._dateAdapter.createDate(year, 0, 1));
return new NgxMatCalendarCell(year, yearName, yearName, this._shouldEnableYear(year));
}
/**
* Whether the given year is enabled.
* @private
* @param {?} year
* @return {?}
*/
_shouldEnableYear(year) {
// disable if the year is greater than maxDate lower than minDate
if (year === undefined || year === null ||
(this.maxDate && year > this._dateAdapter.getYear(this.maxDate)) ||
(this.minDate && year < this._dateAdapter.getYear(this.minDate))) {
return false;
}
// enable if it reaches here and there's no filter defined
if (!this.dateFilter) {
return true;
}
/** @type {?} */
const firstOfYear = this._dateAdapter.createDate(year, 0, 1);
// If any date in the year is enabled count the year as enabled.
for (let date = firstOfYear; this._dateAdapter.getYear(date) == year; date = this._dateAdapter.addCalendarDays(date, 1)) {
if (this.dateFilter(date)) {
return true;
}
}
return false;
}
/**
* @private
* @param {?} obj The object to check.
* @return {?} The given object if it is both a date instance and valid, otherwise null.
*/
_getValidDateOrNull(obj) {
return (this._dateAdapter.isDateInstance(obj) && this._dateAdapter.isValid(obj)) ? obj : null;
}
/**
* Determines whether the user has the RTL layout direction.
* @private
* @return {?}
*/
_isRtl() {
return this._dir && this._dir.value === 'rtl';
}
/**
* Sets the currently-highlighted year based on a model value.
* @private
* @param {?} value
* @return {?}
*/
_setSelectedYear(value) {
this._selectedYear = null;
if (value instanceof DateRange) {
/** @type {?} */
const displayValue = value.start || value.end;
if (displayValue) {
this._selectedYear = this._dateAdapter.getYear(displayValue);
}
}
else if (value) {
this._selectedYear = this._dateAdapter.getYear(value);
}
}
}
NgxMatMultiYearView.decorators = [
{ type: Component, args: [{
selector: 'ngx-mat-multi-year-view',
template: "<table class=\"mat-calendar-table\" role=\"presentation\">\n <thead class=\"mat-calendar-table-header\">\n <tr><th class=\"mat-calendar-table-header-divider\" colspan=\"4\"></th></tr>\n </thead>\n <tbody ngx-mat-calendar-body\n [rows]=\"_years\"\n [todayValue]=\"_todayYear\"\n [startValue]=\"_selectedYear!\"\n [endValue]=\"_selectedYear!\"\n [numCols]=\"4\"\n [cellAspectRatio]=\"4 / 7\"\n [activeCell]=\"_getActiveCell()\"\n (selectedValueChange)=\"_yearSelected($event)\"\n (keydown)=\"_handleCalendarBodyKeydown($event)\">\n </tbody>\n</table>\n\n",
exportAs: 'ngxMatMultiYearView',
encapsulation: ViewEncapsulation.None,
changeDetection: ChangeDetectionStrategy.OnPush
}] }
];
/** @nocollapse */
NgxMatMultiYearView.ctorParameters = () => [
{ type: ChangeDetectorRef },
{ type: NgxMatDateAdapter, decorators: [{ type: Optional }] },
{ type: Directionality, decorators: [{ type: Optional }] }
];
NgxMatMultiYearView.propDecorators = {
activeDate: [{ type: Input }],
selected: [{ type: Input }],
minDate: [{ type: Input }],
maxDate: [{ type: Input }],
dateFilter: [{ type: Input }],
selectedChange: [{ type: Output }],
yearSelected: [{ type: Output }],
activeDateChange: [{ type: Output }],
_matCalendarBody: [{ type: ViewChild, args: [NgxMatCalendarBody,] }]
};
if (false) {
/**
* @type {?}
* @private
*/
NgxMatMultiYearView.prototype._rerenderSubscription;
/**
* @type {?}
* @private
*/
NgxMatMultiYearView.prototype._activeDate;
/**
* @type {?}
* @private
*/
NgxMatMultiYearView.prototype._selected;
/**
* @type {?}
* @private
*/
NgxMatMultiYearView.prototype._minDate;
/**
* @type {?}
* @private
*/
NgxMatMultiYearView.prototype._maxDate;
/**
* A function used to filter which dates are selectable.
* @type {?}
*/
NgxMatMultiYearView.prototype.dateFilter;
/**
* Emits when a new year is selected.
* @type {?}
*/
NgxMatMultiYearView.prototype.selectedChange;
/**
* Emits the selected year. This doesn't imply a change on the selected date
* @type {?}
*/
NgxMatMultiYearView.prototype.yearSelected;
/**
* Emits when any date is activated.
* @type {?}
*/
NgxMatMultiYearView.prototype.activeDateChange;
/**
* The body of calendar table
* @type {?}
*/
NgxMatMultiYearView.prototype._matCalendarBody;
/**
* Grid of calendar cells representing the currently displayed years.
* @type {?}
*/
NgxMatMultiYearView.prototype._years;
/**
* The year that today falls on.
* @type {?}
*/
NgxMatMultiYearView.prototype._todayYear;
/**
* The year of the selected date. Null if the selected date is null.
* @type {?}
*/
NgxMatMultiYearView.prototype._selectedYear;
/**
* @type {?}
* @private
*/
NgxMatMultiYearView.prototype._changeDetectorRef;
/** @type {?} */
NgxMatMultiYearView.prototype._dateAdapter;
/**
* @type {?}
* @private
*/
NgxMatMultiYearView.prototype._dir;
}
/**
* @template D
* @param {?} dateAdapter
* @param {?} date1
* @param {?} date2
* @param {?} minDate
* @param {?} maxDate
* @return {?}
*/
export function isSameMultiYearView(dateAdapter, date1, date2, minDate, maxDate) {
/** @type {?} */
const year1 = dateAdapter.getYear(date1);
/** @type {?} */
const year2 = dateAdapter.getYear(date2);
/** @type {?} */
const startingYear = getStartingYear(dateAdapter, minDate, maxDate);
return Math.floor((year1 - startingYear) / yearsPerPage) ===
Math.floor((year2 - startingYear) / yearsPerPage);
}
/**
* When the multi-year view is first opened, the active year will be in view.
* So we compute how many years are between the active year and the *slot* where our
* "startingYear" will render when paged into view.
* @template D
* @param {?} dateAdapter
* @param {?} activeDate
* @param {?} minDate
* @param {?} maxDate
* @return {?}
*/
export function getActiveOffset(dateAdapter, activeDate, minDate, maxDate) {
/** @type {?} */
const activeYear = dateAdapter.getYear(activeDate);
return euclideanModulo((activeYear - getStartingYear(dateAdapter, minDate, maxDate)), yearsPerPage);
}
/**
* We pick a "starting" year such that either the maximum year would be at the end
* or the minimum year would be at the beginning of a page.
* @template D
* @param {?} dateAdapter
* @param {?} minDate
* @param {?} maxDate
* @return {?}
*/
function getStartingYear(dateAdapter, minDate, maxDate) {
/** @type {?} */
let startingYear = 0;
if (maxDate) {
/** @type {?} */
const maxYear = dateAdapter.getYear(maxDate);
startingYear = maxYear - yearsPerPage + 1;
}
else if (minDate) {
startingYear = dateAdapter.getYear(minDate);
}
return startingYear;
}
/**
* Gets remainder that is non-negative, even if first number is negative
* @param {?} a
* @param {?} b
* @return {?}
*/
function euclideanModulo(a, b) {
return (a % b + b) % b;
}
//# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {\n  DOWN_ARROW,\n  END,\n  ENTER,\n  HOME,\n  LEFT_ARROW,\n  PAGE_DOWN,\n  PAGE_UP,\n  RIGHT_ARROW,\n  UP_ARROW,\n  SPACE,\n} from '@angular/cdk/keycodes';\nimport {\n  AfterContentInit,\n  ChangeDetectionStrategy,\n  ChangeDetectorRef,\n  Component,\n  EventEmitter,\n  Input,\n  Optional,\n  Output,\n  ViewChild,\n  ViewEncapsulation,\n  OnDestroy,\n} from '@angular/core';\nimport {Directionality} from '@angular/cdk/bidi';\nimport {Subscription} from 'rxjs';\nimport {startWith} from 'rxjs/operators';\nimport { DateRange } from '@angular/material/datepicker';\nimport { NgxMatCalendarCell, NgxMatCalendarBody, NgxMatCalendarUserEvent } from './calendar-body';\nimport { NgxMatDateAdapter } from './core/date-adapter';\nimport { createMissingDateImplError } from './utils/date-utils';\n\nexport const yearsPerPage = 24;\n\nexport const yearsPerRow = 4;\n\n/**\n * An internal component used to display a year selector in the datepicker.\n * @docs-private\n */\n@Component({\n  selector: 'ngx-mat-multi-year-view',\n  templateUrl: 'multi-year-view.html',\n  exportAs: 'ngxMatMultiYearView',\n  encapsulation: ViewEncapsulation.None,\n  changeDetection: ChangeDetectionStrategy.OnPush\n})\nexport class NgxMatMultiYearView<D> implements AfterContentInit, OnDestroy {\n  private _rerenderSubscription = Subscription.EMPTY;\n\n  /** The date to display in this multi-year view (everything other than the year is ignored). */\n  @Input()\n  get activeDate(): D { return this._activeDate; }\n  set activeDate(value: D) {\n    let oldActiveDate = this._activeDate;\n    const validDate =\n        this._getValidDateOrNull(this._dateAdapter.deserialize(value)) || this._dateAdapter.today();\n    this._activeDate = this._dateAdapter.clampDate(validDate, this.minDate, this.maxDate);\n\n    if (!isSameMultiYearView(\n      this._dateAdapter, oldActiveDate, this._activeDate, this.minDate, this.maxDate)) {\n      this._init();\n    }\n  }\n  private _activeDate: D;\n\n  /** The currently selected date. */\n  @Input()\n  get selected(): DateRange<D> | D | null { return this._selected; }\n  set selected(value: DateRange<D> | D | null) {\n    if (value instanceof DateRange) {\n      this._selected = value;\n    } else {\n      this._selected = this._getValidDateOrNull(this._dateAdapter.deserialize(value));\n    }\n\n    this._setSelectedYear(value);\n  }\n  private _selected: DateRange<D> | D | null;\n\n\n  /** The minimum selectable date. */\n  @Input()\n  get minDate(): D | null { return this._minDate; }\n  set minDate(value: D | null) {\n    this._minDate = this._getValidDateOrNull(this._dateAdapter.deserialize(value));\n  }\n  private _minDate: D | null;\n\n  /** The maximum selectable date. */\n  @Input()\n  get maxDate(): D | null { return this._maxDate; }\n  set maxDate(value: D | null) {\n    this._maxDate = this._getValidDateOrNull(this._dateAdapter.deserialize(value));\n  }\n  private _maxDate: D | null;\n\n  /** A function used to filter which dates are selectable. */\n  @Input() dateFilter: (date: D) => boolean;\n\n  /** Emits when a new year is selected. */\n  @Output() readonly selectedChange: EventEmitter<D> = new EventEmitter<D>();\n\n  /** Emits the selected year. This doesn't imply a change on the selected date */\n  @Output() readonly yearSelected: EventEmitter<D> = new EventEmitter<D>();\n\n  /** Emits when any date is activated. */\n  @Output() readonly activeDateChange: EventEmitter<D> = new EventEmitter<D>();\n\n  /** The body of calendar table */\n  @ViewChild(NgxMatCalendarBody) _matCalendarBody: NgxMatCalendarBody;\n\n  /** Grid of calendar cells representing the currently displayed years. */\n  _years: NgxMatCalendarCell[][];\n\n  /** The year that today falls on. */\n  _todayYear: number;\n\n  /** The year of the selected date. Null if the selected date is null. */\n  _selectedYear: number | null;\n\n  constructor(private _changeDetectorRef: ChangeDetectorRef,\n              @Optional() public _dateAdapter: NgxMatDateAdapter<D>,\n              @Optional() private _dir?: Directionality) {\n    if (!this._dateAdapter) {\n      throw createMissingDateImplError('NgxMatDateAdapter');\n    }\n\n    this._activeDate = this._dateAdapter.today();\n  }\n\n  ngAfterContentInit() {\n    this._rerenderSubscription = this._dateAdapter.localeChanges\n      .pipe(startWith(null))\n      .subscribe(() => this._init());\n  }\n\n  ngOnDestroy() {\n    this._rerenderSubscription.unsubscribe();\n  }\n\n  /** Initializes this multi-year view. */\n  _init() {\n    this._todayYear = this._dateAdapter.getYear(this._dateAdapter.today());\n\n    // We want a range years such that we maximize the number of\n    // enabled dates visible at once. This prevents issues where the minimum year\n    // is the last item of a page OR the maximum year is the first item of a page.\n\n    // The offset from the active year to the \"slot\" for the starting year is the\n    // *actual* first rendered year in the multi-year view.\n    const activeYear = this._dateAdapter.getYear(this._activeDate);\n    const minYearOfPage = activeYear - getActiveOffset(\n      this._dateAdapter, this.activeDate, this.minDate, this.maxDate);\n\n    this._years = [];\n    for (let i = 0, row: number[] = []; i < yearsPerPage; i++) {\n      row.push(minYearOfPage + i);\n      if (row.length == yearsPerRow) {\n        this._years.push(row.map(year => this._createCellForYear(year)));\n        row = [];\n      }\n    }\n    this._changeDetectorRef.markForCheck();\n  }\n\n  /** Handles when a new year is selected. */\n  _yearSelected(event: NgxMatCalendarUserEvent<number>) {\n    const year = event.value;\n    this.yearSelected.emit(this._dateAdapter.createDate(year, 0, 1));\n    let month = this._dateAdapter.getMonth(this.activeDate);\n    let daysInMonth =\n        this._dateAdapter.getNumDaysInMonth(this._dateAdapter.createDate(year, month, 1));\n    this.selectedChange.emit(this._dateAdapter.createDate(year, month,\n        Math.min(this._dateAdapter.getDate(this.activeDate), daysInMonth)));\n  }\n\n  /** Handles keydown events on the calendar body when calendar is in multi-year view. */\n  _handleCalendarBodyKeydown(event: KeyboardEvent): void {\n    const oldActiveDate = this._activeDate;\n    const isRtl = this._isRtl();\n\n    switch (event.keyCode) {\n      case LEFT_ARROW:\n        this.activeDate = this._dateAdapter.addCalendarYears(this._activeDate, isRtl ? 1 : -1);\n        break;\n      case RIGHT_ARROW:\n        this.activeDate = this._dateAdapter.addCalendarYears(this._activeDate, isRtl ? -1 : 1);\n        break;\n      case UP_ARROW:\n        this.activeDate = this._dateAdapter.addCalendarYears(this._activeDate, -yearsPerRow);\n        break;\n      case DOWN_ARROW:\n        this.activeDate = this._dateAdapter.addCalendarYears(this._activeDate, yearsPerRow);\n        break;\n      case HOME:\n        this.activeDate = this._dateAdapter.addCalendarYears(this._activeDate,\n          -getActiveOffset(this._dateAdapter, this.activeDate, this.minDate, this.maxDate));\n        break;\n      case END:\n        this.activeDate = this._dateAdapter.addCalendarYears(this._activeDate,\n          yearsPerPage - getActiveOffset(\n            this._dateAdapter, this.activeDate, this.minDate, this.maxDate) - 1);\n        break;\n      case PAGE_UP:\n        this.activeDate =\n            this._dateAdapter.addCalendarYears(\n                this._activeDate, event.altKey ? -yearsPerPage * 10 : -yearsPerPage);\n        break;\n      case PAGE_DOWN:\n        this.activeDate =\n            this._dateAdapter.addCalendarYears(\n                this._activeDate, event.altKey ? yearsPerPage * 10 : yearsPerPage);\n        break;\n      case ENTER:\n      case SPACE:\n        this._yearSelected({value: this._dateAdapter.getYear(this._activeDate), event});\n        break;\n      default:\n        // Don't prevent default or focus active cell on keys that we don't explicitly handle.\n        return;\n    }\n    if (this._dateAdapter.compareDate(oldActiveDate, this.activeDate)) {\n      this.activeDateChange.emit(this.activeDate);\n    }\n\n    this._focusActiveCell();\n    // Prevent unexpected default actions such as form submission.\n    event.preventDefault();\n  }\n\n  _getActiveCell(): number {\n    return getActiveOffset(this._dateAdapter, this.activeDate, this.minDate, this.maxDate);\n  }\n\n  /** Focuses the active cell after the microtask queue is empty. */\n  _focusActiveCell() {\n    this._matCalendarBody._focusActiveCell();\n  }\n\n  /** Creates an MatCalendarCell for the given year. */\n  private _createCellForYear(year: number) {\n    let yearName = this._dateAdapter.getYearName(this._dateAdapter.createDate(year, 0, 1));\n    return new NgxMatCalendarCell(year, yearName, yearName, this._shouldEnableYear(year));\n  }\n\n  /** Whether the given year is enabled. */\n  private _shouldEnableYear(year: number) {\n    // disable if the year is greater than maxDate lower than minDate\n    if (year === undefined || year === null ||\n        (this.maxDate && year > this._dateAdapter.getYear(this.maxDate)) ||\n        (this.minDate && year < this._dateAdapter.getYear(this.minDate))) {\n      return false;\n    }\n\n    // enable if it reaches here and there's no filter defined\n    if (!this.dateFilter) {\n      return true;\n    }\n\n    const firstOfYear = this._dateAdapter.createDate(year, 0, 1);\n\n    // If any date in the year is enabled count the year as enabled.\n    for (let date = firstOfYear; this._dateAdapter.getYear(date) == year;\n      date = this._dateAdapter.addCalendarDays(date, 1)) {\n      if (this.dateFilter(date)) {\n        return true;\n      }\n    }\n\n    return false;\n  }\n\n  /**\n   * @param obj The object to check.\n   * @returns The given object if it is both a date instance and valid, otherwise null.\n   */\n  private _getValidDateOrNull(obj: any): D | null {\n    return (this._dateAdapter.isDateInstance(obj) && this._dateAdapter.isValid(obj)) ? obj : null;\n  }\n\n  /** Determines whether the user has the RTL layout direction. */\n  private _isRtl() {\n    return this._dir && this._dir.value === 'rtl';\n  }\n\n  /** Sets the currently-highlighted year based on a model value. */\n  private _setSelectedYear(value: DateRange<D> | D | null) {\n    this._selectedYear = null;\n\n    if (value instanceof DateRange) {\n      const displayValue = value.start || value.end;\n\n      if (displayValue) {\n        this._selectedYear = this._dateAdapter.getYear(displayValue);\n      }\n    } else if (value) {\n      this._selectedYear = this._dateAdapter.getYear(value);\n    }\n  }\n}\n\nexport function isSameMultiYearView<D>(\n  dateAdapter: NgxMatDateAdapter<D>, date1: D, date2: D, minDate: D | null, maxDate: D | null): boolean {\n  const year1 = dateAdapter.getYear(date1);\n  const year2 = dateAdapter.getYear(date2);\n  const startingYear = getStartingYear(dateAdapter, minDate, maxDate);\n  return Math.floor((year1 - startingYear) / yearsPerPage) ===\n          Math.floor((year2 - startingYear) / yearsPerPage);\n}\n\n/**\n * When the multi-year view is first opened, the active year will be in view.\n * So we compute how many years are between the active year and the *slot* where our\n * \"startingYear\" will render when paged into view.\n */\nexport function getActiveOffset<D>(\n  dateAdapter: NgxMatDateAdapter<D>, activeDate: D, minDate: D | null, maxDate: D | null): number {\n  const activeYear = dateAdapter.getYear(activeDate);\n  return euclideanModulo((activeYear - getStartingYear(dateAdapter, minDate, maxDate)),\n    yearsPerPage);\n}\n\n/**\n * We pick a \"starting\" year such that either the maximum year would be at the end\n * or the minimum year would be at the beginning of a page.\n */\nfunction getStartingYear<D>(\n  dateAdapter: NgxMatDateAdapter<D>, minDate: D | null, maxDate: D | null): number {\n  let startingYear = 0;\n  if (maxDate) {\n    const maxYear = dateAdapter.getYear(maxDate);\n    startingYear = maxYear - yearsPerPage + 1;\n  } else if (minDate) {\n    startingYear = dateAdapter.getYear(minDate);\n  }\n  return startingYear;\n}\n\n/** Gets remainder that is non-negative, even if first number is negative */\nfunction euclideanModulo (a: number, b: number): number {\n  return (a % b + b) % b;\n}\n"]}