/** * @fileoverview added by tsickle * Generated from: src/material/datepicker/year-view.ts * @suppress {checkTypes,constantProperty,extraRequire,missingOverride,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, Inject, Input, Optional, Output, ViewChild, ViewEncapsulation, } from '@angular/core'; import { DateAdapter, MAT_DATE_FORMATS } from '@angular/material/core'; import { Directionality } from '@angular/cdk/bidi'; import { MatCalendarBody, MatCalendarCell } from './calendar-body'; import { createMissingDateImplError } from './datepicker-errors'; import { Subscription } from 'rxjs'; import { startWith } from 'rxjs/operators'; /** * An internal component used to display a single year in the datepicker. * \@docs-private * @template D */ export class MatYearView { /** * @param {?} _changeDetectorRef * @param {?} _dateFormats * @param {?} _dateAdapter * @param {?=} _dir */ constructor(_changeDetectorRef, _dateFormats, _dateAdapter, _dir) { this._changeDetectorRef = _changeDetectorRef; this._dateFormats = _dateFormats; this._dateAdapter = _dateAdapter; this._dir = _dir; this._rerenderSubscription = Subscription.EMPTY; /** * Emits when a new month is selected. */ this.selectedChange = new EventEmitter(); /** * Emits the selected month. This doesn't imply a change on the selected date */ this.monthSelected = new EventEmitter(); /** * Emits when any date is activated. */ this.activeDateChange = new EventEmitter(); if (!this._dateAdapter) { throw createMissingDateImplError('DateAdapter'); } if (!this._dateFormats) { throw createMissingDateImplError('MAT_DATE_FORMATS'); } this._activeDate = this._dateAdapter.today(); } /** * The date to display in this 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 (this._dateAdapter.getYear(oldActiveDate) !== this._dateAdapter.getYear(this._activeDate)) { this._init(); } } /** * The currently selected date. * @return {?} */ get selected() { return this._selected; } /** * @param {?} value * @return {?} */ set selected(value) { this._selected = this._getValidDateOrNull(this._dateAdapter.deserialize(value)); this._selectedMonth = this._getMonthInCurrentYear(this._selected); } /** * 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(); } /** * Handles when a new month is selected. * @param {?} month * @return {?} */ _monthSelected(month) { /** @type {?} */ const normalizedDate = this._dateAdapter.createDate(this._dateAdapter.getYear(this.activeDate), month, 1); this.monthSelected.emit(normalizedDate); /** @type {?} */ const daysInMonth = this._dateAdapter.getNumDaysInMonth(normalizedDate); this.selectedChange.emit(this._dateAdapter.createDate(this._dateAdapter.getYear(this.activeDate), month, Math.min(this._dateAdapter.getDate(this.activeDate), daysInMonth))); } /** * Handles keydown events on the calendar body when calendar is in year view. * @param {?} event * @return {?} */ _handleCalendarBodyKeydown(event) { // TODO(mmalerba): We currently allow keyboard navigation to disabled dates, but just prevent // disabled ones from being selected. This may not be ideal, we should look into whether // navigation should skip over disabled dates, and if so, how to implement that efficiently. // TODO(mmalerba): We currently allow keyboard navigation to disabled dates, but just prevent // disabled ones from being selected. This may not be ideal, we should look into whether // navigation should skip over disabled dates, and if so, how to implement that efficiently. /** @type {?} */ const oldActiveDate = this._activeDate; /** @type {?} */ const isRtl = this._isRtl(); switch (event.keyCode) { case LEFT_ARROW: this.activeDate = this._dateAdapter.addCalendarMonths(this._activeDate, isRtl ? 1 : -1); break; case RIGHT_ARROW: this.activeDate = this._dateAdapter.addCalendarMonths(this._activeDate, isRtl ? -1 : 1); break; case UP_ARROW: this.activeDate = this._dateAdapter.addCalendarMonths(this._activeDate, -4); break; case DOWN_ARROW: this.activeDate = this._dateAdapter.addCalendarMonths(this._activeDate, 4); break; case HOME: this.activeDate = this._dateAdapter.addCalendarMonths(this._activeDate, -this._dateAdapter.getMonth(this._activeDate)); break; case END: this.activeDate = this._dateAdapter.addCalendarMonths(this._activeDate, 11 - this._dateAdapter.getMonth(this._activeDate)); break; case PAGE_UP: this.activeDate = this._dateAdapter.addCalendarYears(this._activeDate, event.altKey ? -10 : -1); break; case PAGE_DOWN: this.activeDate = this._dateAdapter.addCalendarYears(this._activeDate, event.altKey ? 10 : 1); break; case ENTER: case SPACE: this._monthSelected(this._dateAdapter.getMonth(this._activeDate)); 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(); } /** * Initializes this year view. * @return {?} */ _init() { this._selectedMonth = this._getMonthInCurrentYear(this.selected); this._todayMonth = this._getMonthInCurrentYear(this._dateAdapter.today()); this._yearLabel = this._dateAdapter.getYearName(this.activeDate); /** @type {?} */ let monthNames = this._dateAdapter.getMonthNames('short'); // First row of months only contains 5 elements so we can fit the year label on the same row. this._months = [[0, 1, 2, 3], [4, 5, 6, 7], [8, 9, 10, 11]].map((/** * @param {?} row * @return {?} */ row => row.map((/** * @param {?} month * @return {?} */ month => this._createCellForMonth(month, monthNames[month]))))); this._changeDetectorRef.markForCheck(); } /** * Focuses the active cell after the microtask queue is empty. * @return {?} */ _focusActiveCell() { this._matCalendarBody._focusActiveCell(); } /** * Gets the month in this year that the given Date falls on. * Returns null if the given Date is in another year. * @private * @param {?} date * @return {?} */ _getMonthInCurrentYear(date) { return date && this._dateAdapter.getYear(date) == this._dateAdapter.getYear(this.activeDate) ? this._dateAdapter.getMonth(date) : null; } /** * Creates an MatCalendarCell for the given month. * @private * @param {?} month * @param {?} monthName * @return {?} */ _createCellForMonth(month, monthName) { /** @type {?} */ let ariaLabel = this._dateAdapter.format(this._dateAdapter.createDate(this._dateAdapter.getYear(this.activeDate), month, 1), this._dateFormats.display.monthYearA11yLabel); return new MatCalendarCell(month, monthName.toLocaleUpperCase(), ariaLabel, this._shouldEnableMonth(month)); } /** * Whether the given month is enabled. * @private * @param {?} month * @return {?} */ _shouldEnableMonth(month) { /** @type {?} */ const activeYear = this._dateAdapter.getYear(this.activeDate); if (month === undefined || month === null || this._isYearAndMonthAfterMaxDate(activeYear, month) || this._isYearAndMonthBeforeMinDate(activeYear, month)) { return false; } if (!this.dateFilter) { return true; } /** @type {?} */ const firstOfMonth = this._dateAdapter.createDate(activeYear, month, 1); // If any date in the month is enabled count the month as enabled. for (let date = firstOfMonth; this._dateAdapter.getMonth(date) == month; date = this._dateAdapter.addCalendarDays(date, 1)) { if (this.dateFilter(date)) { return true; } } return false; } /** * Tests whether the combination month/year is after this.maxDate, considering * just the month and year of this.maxDate * @private * @param {?} year * @param {?} month * @return {?} */ _isYearAndMonthAfterMaxDate(year, month) { if (this.maxDate) { /** @type {?} */ const maxYear = this._dateAdapter.getYear(this.maxDate); /** @type {?} */ const maxMonth = this._dateAdapter.getMonth(this.maxDate); return year > maxYear || (year === maxYear && month > maxMonth); } return false; } /** * Tests whether the combination month/year is before this.minDate, considering * just the month and year of this.minDate * @private * @param {?} year * @param {?} month * @return {?} */ _isYearAndMonthBeforeMinDate(year, month) { if (this.minDate) { /** @type {?} */ const minYear = this._dateAdapter.getYear(this.minDate); /** @type {?} */ const minMonth = this._dateAdapter.getMonth(this.minDate); return year < minYear || (year === minYear && month < minMonth); } 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'; } } MatYearView.decorators = [ { type: Component, args: [{ selector: 'mat-year-view', template: "\n \n \n \n \n \n
\n", exportAs: 'matYearView', encapsulation: ViewEncapsulation.None, changeDetection: ChangeDetectionStrategy.OnPush }] } ]; /** @nocollapse */ MatYearView.ctorParameters = () => [ { type: ChangeDetectorRef }, { type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [MAT_DATE_FORMATS,] }] }, { type: DateAdapter, decorators: [{ type: Optional }] }, { type: Directionality, decorators: [{ type: Optional }] } ]; MatYearView.propDecorators = { activeDate: [{ type: Input }], selected: [{ type: Input }], minDate: [{ type: Input }], maxDate: [{ type: Input }], dateFilter: [{ type: Input }], selectedChange: [{ type: Output }], monthSelected: [{ type: Output }], activeDateChange: [{ type: Output }], _matCalendarBody: [{ type: ViewChild, args: [MatCalendarBody,] }] }; if (false) { /** * @type {?} * @private */ MatYearView.prototype._rerenderSubscription; /** * @type {?} * @private */ MatYearView.prototype._activeDate; /** * @type {?} * @private */ MatYearView.prototype._selected; /** * @type {?} * @private */ MatYearView.prototype._minDate; /** * @type {?} * @private */ MatYearView.prototype._maxDate; /** * A function used to filter which dates are selectable. * @type {?} */ MatYearView.prototype.dateFilter; /** * Emits when a new month is selected. * @type {?} */ MatYearView.prototype.selectedChange; /** * Emits the selected month. This doesn't imply a change on the selected date * @type {?} */ MatYearView.prototype.monthSelected; /** * Emits when any date is activated. * @type {?} */ MatYearView.prototype.activeDateChange; /** * The body of calendar table * @type {?} */ MatYearView.prototype._matCalendarBody; /** * Grid of calendar cells representing the months of the year. * @type {?} */ MatYearView.prototype._months; /** * The label for this year (e.g. "2017"). * @type {?} */ MatYearView.prototype._yearLabel; /** * The month in this year that today falls on. Null if today is in a different year. * @type {?} */ MatYearView.prototype._todayMonth; /** * The month in this year that the selected Date falls on. * Null if the selected Date is in a different year. * @type {?} */ MatYearView.prototype._selectedMonth; /** * @type {?} * @private */ MatYearView.prototype._changeDetectorRef; /** * @type {?} * @private */ MatYearView.prototype._dateFormats; /** @type {?} */ MatYearView.prototype._dateAdapter; /** * @type {?} * @private */ MatYearView.prototype._dir; } //# 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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  Inject,\n  Input,\n  Optional,\n  Output,\n  ViewChild,\n  ViewEncapsulation,\n  OnDestroy,\n} from '@angular/core';\nimport {DateAdapter, MAT_DATE_FORMATS, MatDateFormats} from '@angular/material/core';\nimport {Directionality} from '@angular/cdk/bidi';\nimport {MatCalendarBody, MatCalendarCell} from './calendar-body';\nimport {createMissingDateImplError} from './datepicker-errors';\nimport {Subscription} from 'rxjs';\nimport {startWith} from 'rxjs/operators';\n\n/**\n * An internal component used to display a single year in the datepicker.\n * @docs-private\n */\n@Component({\n  selector: 'mat-year-view',\n  templateUrl: 'year-view.html',\n  exportAs: 'matYearView',\n  encapsulation: ViewEncapsulation.None,\n  changeDetection: ChangeDetectionStrategy.OnPush\n})\nexport class MatYearView<D> implements AfterContentInit, OnDestroy {\n  private _rerenderSubscription = Subscription.EMPTY;\n\n  /** The date to display in this 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    if (this._dateAdapter.getYear(oldActiveDate) !== this._dateAdapter.getYear(this._activeDate)) {\n      this._init();\n    }\n  }\n  private _activeDate: D;\n\n  /** The currently selected date. */\n  @Input()\n  get selected(): D | null { return this._selected; }\n  set selected(value: D | null) {\n    this._selected = this._getValidDateOrNull(this._dateAdapter.deserialize(value));\n    this._selectedMonth = this._getMonthInCurrentYear(this._selected);\n  }\n  private _selected: D | null;\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 month is selected. */\n  @Output() readonly selectedChange: EventEmitter<D> = new EventEmitter<D>();\n\n  /** Emits the selected month. This doesn't imply a change on the selected date */\n  @Output() readonly monthSelected: 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(MatCalendarBody) _matCalendarBody: MatCalendarBody;\n\n  /** Grid of calendar cells representing the months of the year. */\n  _months: MatCalendarCell[][];\n\n  /** The label for this year (e.g. \"2017\"). */\n  _yearLabel: string;\n\n  /** The month in this year that today falls on. Null if today is in a different year. */\n  _todayMonth: number | null;\n\n  /**\n   * The month in this year that the selected Date falls on.\n   * Null if the selected Date is in a different year.\n   */\n  _selectedMonth: number | null;\n\n  constructor(private _changeDetectorRef: ChangeDetectorRef,\n              @Optional() @Inject(MAT_DATE_FORMATS) private _dateFormats: MatDateFormats,\n              @Optional() public _dateAdapter: DateAdapter<D>,\n              @Optional() private _dir?: Directionality) {\n    if (!this._dateAdapter) {\n      throw createMissingDateImplError('DateAdapter');\n    }\n    if (!this._dateFormats) {\n      throw createMissingDateImplError('MAT_DATE_FORMATS');\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  /** Handles when a new month is selected. */\n  _monthSelected(month: number) {\n    const normalizedDate =\n          this._dateAdapter.createDate(this._dateAdapter.getYear(this.activeDate), month, 1);\n\n    this.monthSelected.emit(normalizedDate);\n\n    const daysInMonth = this._dateAdapter.getNumDaysInMonth(normalizedDate);\n\n    this.selectedChange.emit(this._dateAdapter.createDate(\n        this._dateAdapter.getYear(this.activeDate), month,\n        Math.min(this._dateAdapter.getDate(this.activeDate), daysInMonth)));\n  }\n\n  /** Handles keydown events on the calendar body when calendar is in year view. */\n  _handleCalendarBodyKeydown(event: KeyboardEvent): void {\n    // TODO(mmalerba): We currently allow keyboard navigation to disabled dates, but just prevent\n    // disabled ones from being selected. This may not be ideal, we should look into whether\n    // navigation should skip over disabled dates, and if so, how to implement that efficiently.\n\n    const oldActiveDate = this._activeDate;\n    const isRtl = this._isRtl();\n\n    switch (event.keyCode) {\n      case LEFT_ARROW:\n        this.activeDate = this._dateAdapter.addCalendarMonths(this._activeDate, isRtl ? 1 : -1);\n        break;\n      case RIGHT_ARROW:\n        this.activeDate = this._dateAdapter.addCalendarMonths(this._activeDate, isRtl ? -1 : 1);\n        break;\n      case UP_ARROW:\n        this.activeDate = this._dateAdapter.addCalendarMonths(this._activeDate, -4);\n        break;\n      case DOWN_ARROW:\n        this.activeDate = this._dateAdapter.addCalendarMonths(this._activeDate, 4);\n        break;\n      case HOME:\n        this.activeDate = this._dateAdapter.addCalendarMonths(this._activeDate,\n            -this._dateAdapter.getMonth(this._activeDate));\n        break;\n      case END:\n        this.activeDate = this._dateAdapter.addCalendarMonths(this._activeDate,\n            11 - this._dateAdapter.getMonth(this._activeDate));\n        break;\n      case PAGE_UP:\n        this.activeDate =\n            this._dateAdapter.addCalendarYears(this._activeDate, event.altKey ? -10 : -1);\n        break;\n      case PAGE_DOWN:\n        this.activeDate =\n            this._dateAdapter.addCalendarYears(this._activeDate, event.altKey ? 10 : 1);\n        break;\n      case ENTER:\n      case SPACE:\n        this._monthSelected(this._dateAdapter.getMonth(this._activeDate));\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\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  /** Initializes this year view. */\n  _init() {\n    this._selectedMonth = this._getMonthInCurrentYear(this.selected);\n    this._todayMonth = this._getMonthInCurrentYear(this._dateAdapter.today());\n    this._yearLabel = this._dateAdapter.getYearName(this.activeDate);\n\n    let monthNames = this._dateAdapter.getMonthNames('short');\n    // First row of months only contains 5 elements so we can fit the year label on the same row.\n    this._months = [[0, 1, 2, 3], [4, 5, 6, 7], [8, 9, 10, 11]].map(row => row.map(\n        month => this._createCellForMonth(month, monthNames[month])));\n    this._changeDetectorRef.markForCheck();\n  }\n\n  /** Focuses the active cell after the microtask queue is empty. */\n  _focusActiveCell() {\n    this._matCalendarBody._focusActiveCell();\n  }\n\n  /**\n   * Gets the month in this year that the given Date falls on.\n   * Returns null if the given Date is in another year.\n   */\n  private _getMonthInCurrentYear(date: D | null) {\n    return date && this._dateAdapter.getYear(date) == this._dateAdapter.getYear(this.activeDate) ?\n        this._dateAdapter.getMonth(date) : null;\n  }\n\n  /** Creates an MatCalendarCell for the given month. */\n  private _createCellForMonth(month: number, monthName: string) {\n    let ariaLabel = this._dateAdapter.format(\n        this._dateAdapter.createDate(this._dateAdapter.getYear(this.activeDate), month, 1),\n        this._dateFormats.display.monthYearA11yLabel);\n    return new MatCalendarCell(\n        month, monthName.toLocaleUpperCase(), ariaLabel, this._shouldEnableMonth(month));\n  }\n\n  /** Whether the given month is enabled. */\n  private _shouldEnableMonth(month: number) {\n\n    const activeYear = this._dateAdapter.getYear(this.activeDate);\n\n    if (month === undefined || month === null ||\n        this._isYearAndMonthAfterMaxDate(activeYear, month) ||\n        this._isYearAndMonthBeforeMinDate(activeYear, month)) {\n      return false;\n    }\n\n    if (!this.dateFilter) {\n      return true;\n    }\n\n    const firstOfMonth = this._dateAdapter.createDate(activeYear, month, 1);\n\n    // If any date in the month is enabled count the month as enabled.\n    for (let date = firstOfMonth; this._dateAdapter.getMonth(date) == month;\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   * Tests whether the combination month/year is after this.maxDate, considering\n   * just the month and year of this.maxDate\n   */\n  private _isYearAndMonthAfterMaxDate(year: number, month: number) {\n    if (this.maxDate) {\n      const maxYear = this._dateAdapter.getYear(this.maxDate);\n      const maxMonth = this._dateAdapter.getMonth(this.maxDate);\n\n      return year > maxYear || (year === maxYear && month > maxMonth);\n    }\n\n    return false;\n  }\n\n  /**\n   * Tests whether the combination month/year is before this.minDate, considering\n   * just the month and year of this.minDate\n   */\n  private _isYearAndMonthBeforeMinDate(year: number, month: number) {\n    if (this.minDate) {\n      const minYear = this._dateAdapter.getYear(this.minDate);\n      const minMonth = this._dateAdapter.getMonth(this.minDate);\n\n      return year < minYear || (year === minYear && month < minMonth);\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"]}