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268 lines
42 KiB
268 lines
42 KiB
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import { DOWN_ARROW, END, ENTER, HOME, LEFT_ARROW, PAGE_DOWN, PAGE_UP, RIGHT_ARROW, UP_ARROW, SPACE, } from '@angular/cdk/keycodes';
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import { ChangeDetectionStrategy, ChangeDetectorRef, Component, EventEmitter, Inject, Input, Optional, Output, ViewChild, ViewEncapsulation, } from '@angular/core';
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import { DateAdapter, MAT_DATE_FORMATS } from '@angular/material/core';
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import { Directionality } from '@angular/cdk/bidi';
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import { MatCalendarBody, MatCalendarCell, } from './calendar-body';
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import { createMissingDateImplError } from './datepicker-errors';
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import { Subscription } from 'rxjs';
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import { startWith } from 'rxjs/operators';
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import { DateRange } from './date-selection-model';
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/**
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* An internal component used to display a single year in the datepicker.
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* @docs-private
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*/
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export class MatYearView {
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constructor(_changeDetectorRef, _dateFormats, _dateAdapter, _dir) {
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this._changeDetectorRef = _changeDetectorRef;
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this._dateFormats = _dateFormats;
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this._dateAdapter = _dateAdapter;
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this._dir = _dir;
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this._rerenderSubscription = Subscription.EMPTY;
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/** Emits when a new month is selected. */
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this.selectedChange = new EventEmitter();
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/** Emits the selected month. This doesn't imply a change on the selected date */
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this.monthSelected = new EventEmitter();
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/** Emits when any date is activated. */
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this.activeDateChange = new EventEmitter();
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if (typeof ngDevMode === 'undefined' || ngDevMode) {
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if (!this._dateAdapter) {
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throw createMissingDateImplError('DateAdapter');
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}
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if (!this._dateFormats) {
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throw createMissingDateImplError('MAT_DATE_FORMATS');
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}
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}
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this._activeDate = this._dateAdapter.today();
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}
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/** The date to display in this year view (everything other than the year is ignored). */
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get activeDate() { return this._activeDate; }
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set activeDate(value) {
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let oldActiveDate = this._activeDate;
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const validDate = this._dateAdapter.getValidDateOrNull(this._dateAdapter.deserialize(value)) || this._dateAdapter.today();
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this._activeDate = this._dateAdapter.clampDate(validDate, this.minDate, this.maxDate);
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if (this._dateAdapter.getYear(oldActiveDate) !== this._dateAdapter.getYear(this._activeDate)) {
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this._init();
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}
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}
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/** The currently selected date. */
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get selected() { return this._selected; }
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set selected(value) {
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if (value instanceof DateRange) {
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this._selected = value;
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}
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else {
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this._selected = this._dateAdapter.getValidDateOrNull(this._dateAdapter.deserialize(value));
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}
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this._setSelectedMonth(value);
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}
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/** The minimum selectable date. */
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get minDate() { return this._minDate; }
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set minDate(value) {
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this._minDate = this._dateAdapter.getValidDateOrNull(this._dateAdapter.deserialize(value));
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}
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/** The maximum selectable date. */
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get maxDate() { return this._maxDate; }
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set maxDate(value) {
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this._maxDate = this._dateAdapter.getValidDateOrNull(this._dateAdapter.deserialize(value));
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}
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ngAfterContentInit() {
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this._rerenderSubscription = this._dateAdapter.localeChanges
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.pipe(startWith(null))
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.subscribe(() => this._init());
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}
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ngOnDestroy() {
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this._rerenderSubscription.unsubscribe();
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}
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/** Handles when a new month is selected. */
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_monthSelected(event) {
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const month = event.value;
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const normalizedDate = this._dateAdapter.createDate(this._dateAdapter.getYear(this.activeDate), month, 1);
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this.monthSelected.emit(normalizedDate);
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const daysInMonth = this._dateAdapter.getNumDaysInMonth(normalizedDate);
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this.selectedChange.emit(this._dateAdapter.createDate(this._dateAdapter.getYear(this.activeDate), month, Math.min(this._dateAdapter.getDate(this.activeDate), daysInMonth)));
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}
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/** Handles keydown events on the calendar body when calendar is in year view. */
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_handleCalendarBodyKeydown(event) {
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// TODO(mmalerba): We currently allow keyboard navigation to disabled dates, but just prevent
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// disabled ones from being selected. This may not be ideal, we should look into whether
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// navigation should skip over disabled dates, and if so, how to implement that efficiently.
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const oldActiveDate = this._activeDate;
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const isRtl = this._isRtl();
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switch (event.keyCode) {
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case LEFT_ARROW:
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this.activeDate = this._dateAdapter.addCalendarMonths(this._activeDate, isRtl ? 1 : -1);
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break;
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case RIGHT_ARROW:
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this.activeDate = this._dateAdapter.addCalendarMonths(this._activeDate, isRtl ? -1 : 1);
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break;
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case UP_ARROW:
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this.activeDate = this._dateAdapter.addCalendarMonths(this._activeDate, -4);
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break;
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case DOWN_ARROW:
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this.activeDate = this._dateAdapter.addCalendarMonths(this._activeDate, 4);
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break;
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case HOME:
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this.activeDate = this._dateAdapter.addCalendarMonths(this._activeDate, -this._dateAdapter.getMonth(this._activeDate));
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break;
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case END:
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this.activeDate = this._dateAdapter.addCalendarMonths(this._activeDate, 11 - this._dateAdapter.getMonth(this._activeDate));
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break;
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case PAGE_UP:
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this.activeDate =
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this._dateAdapter.addCalendarYears(this._activeDate, event.altKey ? -10 : -1);
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break;
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case PAGE_DOWN:
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this.activeDate =
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this._dateAdapter.addCalendarYears(this._activeDate, event.altKey ? 10 : 1);
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break;
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case ENTER:
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case SPACE:
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// Note that we only prevent the default action here while the selection happens in
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// `keyup` below. We can't do the selection here, because it can cause the calendar to
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// reopen if focus is restored immediately. We also can't call `preventDefault` on `keyup`
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// because it's too late (see #23305).
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this._selectionKeyPressed = true;
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break;
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default:
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// Don't prevent default or focus active cell on keys that we don't explicitly handle.
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return;
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}
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if (this._dateAdapter.compareDate(oldActiveDate, this.activeDate)) {
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this.activeDateChange.emit(this.activeDate);
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}
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this._focusActiveCell();
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// Prevent unexpected default actions such as form submission.
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event.preventDefault();
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}
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/** Handles keyup events on the calendar body when calendar is in year view. */
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_handleCalendarBodyKeyup(event) {
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if (event.keyCode === SPACE || event.keyCode === ENTER) {
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if (this._selectionKeyPressed) {
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this._monthSelected({ value: this._dateAdapter.getMonth(this._activeDate), event });
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}
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this._selectionKeyPressed = false;
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}
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}
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/** Initializes this year view. */
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_init() {
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this._setSelectedMonth(this.selected);
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this._todayMonth = this._getMonthInCurrentYear(this._dateAdapter.today());
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this._yearLabel = this._dateAdapter.getYearName(this.activeDate);
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let monthNames = this._dateAdapter.getMonthNames('short');
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// First row of months only contains 5 elements so we can fit the year label on the same row.
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this._months = [[0, 1, 2, 3], [4, 5, 6, 7], [8, 9, 10, 11]].map(row => row.map(month => this._createCellForMonth(month, monthNames[month])));
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this._changeDetectorRef.markForCheck();
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}
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/** Focuses the active cell after the microtask queue is empty. */
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_focusActiveCell() {
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this._matCalendarBody._focusActiveCell();
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}
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/**
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* Gets the month in this year that the given Date falls on.
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* Returns null if the given Date is in another year.
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*/
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_getMonthInCurrentYear(date) {
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return date && this._dateAdapter.getYear(date) == this._dateAdapter.getYear(this.activeDate) ?
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this._dateAdapter.getMonth(date) : null;
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}
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/** Creates an MatCalendarCell for the given month. */
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_createCellForMonth(month, monthName) {
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const date = this._dateAdapter.createDate(this._dateAdapter.getYear(this.activeDate), month, 1);
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const ariaLabel = this._dateAdapter.format(date, this._dateFormats.display.monthYearA11yLabel);
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const cellClasses = this.dateClass ? this.dateClass(date, 'year') : undefined;
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return new MatCalendarCell(month, monthName.toLocaleUpperCase(), ariaLabel, this._shouldEnableMonth(month), cellClasses);
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}
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/** Whether the given month is enabled. */
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_shouldEnableMonth(month) {
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const activeYear = this._dateAdapter.getYear(this.activeDate);
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if (month === undefined || month === null ||
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this._isYearAndMonthAfterMaxDate(activeYear, month) ||
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this._isYearAndMonthBeforeMinDate(activeYear, month)) {
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return false;
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}
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if (!this.dateFilter) {
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return true;
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}
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const firstOfMonth = this._dateAdapter.createDate(activeYear, month, 1);
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// If any date in the month is enabled count the month as enabled.
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for (let date = firstOfMonth; this._dateAdapter.getMonth(date) == month; date = this._dateAdapter.addCalendarDays(date, 1)) {
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if (this.dateFilter(date)) {
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return true;
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}
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}
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return false;
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}
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/**
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* Tests whether the combination month/year is after this.maxDate, considering
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* just the month and year of this.maxDate
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*/
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_isYearAndMonthAfterMaxDate(year, month) {
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if (this.maxDate) {
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const maxYear = this._dateAdapter.getYear(this.maxDate);
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const maxMonth = this._dateAdapter.getMonth(this.maxDate);
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return year > maxYear || (year === maxYear && month > maxMonth);
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}
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return false;
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}
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/**
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* Tests whether the combination month/year is before this.minDate, considering
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* just the month and year of this.minDate
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*/
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_isYearAndMonthBeforeMinDate(year, month) {
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if (this.minDate) {
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const minYear = this._dateAdapter.getYear(this.minDate);
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const minMonth = this._dateAdapter.getMonth(this.minDate);
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return year < minYear || (year === minYear && month < minMonth);
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}
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return false;
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}
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/** Determines whether the user has the RTL layout direction. */
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_isRtl() {
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return this._dir && this._dir.value === 'rtl';
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}
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/** Sets the currently-selected month based on a model value. */
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_setSelectedMonth(value) {
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if (value instanceof DateRange) {
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this._selectedMonth = this._getMonthInCurrentYear(value.start) ||
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this._getMonthInCurrentYear(value.end);
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}
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else {
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this._selectedMonth = this._getMonthInCurrentYear(value);
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}
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}
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}
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MatYearView.decorators = [
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{ type: Component, args: [{
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selector: 'mat-year-view',
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template: "<table class=\"mat-calendar-table\" role=\"grid\">\n <thead aria-hidden=\"true\" class=\"mat-calendar-table-header\">\n <tr><th class=\"mat-calendar-table-header-divider\" colspan=\"4\"></th></tr>\n </thead>\n <tbody mat-calendar-body\n [label]=\"_yearLabel\"\n [rows]=\"_months\"\n [todayValue]=\"_todayMonth!\"\n [startValue]=\"_selectedMonth!\"\n [endValue]=\"_selectedMonth!\"\n [labelMinRequiredCells]=\"2\"\n [numCols]=\"4\"\n [cellAspectRatio]=\"4 / 7\"\n [activeCell]=\"_dateAdapter.getMonth(activeDate)\"\n (selectedValueChange)=\"_monthSelected($event)\"\n (keyup)=\"_handleCalendarBodyKeyup($event)\"\n (keydown)=\"_handleCalendarBodyKeydown($event)\">\n </tbody>\n</table>\n",
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exportAs: 'matYearView',
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encapsulation: ViewEncapsulation.None,
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changeDetection: ChangeDetectionStrategy.OnPush
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},] }
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];
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MatYearView.ctorParameters = () => [
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{ type: ChangeDetectorRef },
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{ type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [MAT_DATE_FORMATS,] }] },
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{ type: DateAdapter, decorators: [{ type: Optional }] },
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{ type: Directionality, decorators: [{ type: Optional }] }
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];
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MatYearView.propDecorators = {
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activeDate: [{ type: Input }],
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selected: [{ type: Input }],
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minDate: [{ type: Input }],
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maxDate: [{ type: Input }],
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dateFilter: [{ type: Input }],
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dateClass: [{ type: Input }],
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selectedChange: [{ type: Output }],
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monthSelected: [{ type: Output }],
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activeDateChange: [{ type: Output }],
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_matCalendarBody: [{ type: ViewChild, args: [MatCalendarBody,] }]
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};
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//# 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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 {\n  MatCalendarBody,\n  MatCalendarCell,\n  MatCalendarUserEvent,\n  MatCalendarCellClassFunction,\n} from './calendar-body';\nimport {createMissingDateImplError} from './datepicker-errors';\nimport {Subscription} from 'rxjs';\nimport {startWith} from 'rxjs/operators';\nimport {DateRange} from './date-selection-model';\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  /** Flag used to filter out space/enter keyup events that originated outside of the view. */\n  private _selectionKeyPressed: boolean;\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._dateAdapter.getValidDateOrNull(\n        this._dateAdapter.deserialize(value)\n      ) || 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(): 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._dateAdapter.getValidDateOrNull(this._dateAdapter.deserialize(value));\n    }\n\n    this._setSelectedMonth(value);\n  }\n  private _selected: DateRange<D> | 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._dateAdapter.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._dateAdapter.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  /** Function that can be used to add custom CSS classes to date cells. */\n  @Input() dateClass: MatCalendarCellClassFunction<D>;\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(readonly _changeDetectorRef: ChangeDetectorRef,\n              @Optional() @Inject(MAT_DATE_FORMATS) private _dateFormats: MatDateFormats,\n              @Optional() public _dateAdapter: DateAdapter<D>,\n              @Optional() private _dir?: Directionality) {\n\n    if (typeof ngDevMode === 'undefined' || ngDevMode) {\n      if (!this._dateAdapter) {\n        throw createMissingDateImplError('DateAdapter');\n      }\n      if (!this._dateFormats) {\n        throw createMissingDateImplError('MAT_DATE_FORMATS');\n      }\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(event: MatCalendarUserEvent<number>) {\n    const month = event.value;\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        // Note that we only prevent the default action here while the selection happens in\n        // `keyup` below. We can't do the selection here, because it can cause the calendar to\n        // reopen if focus is restored immediately. We also can't call `preventDefault` on `keyup`\n        // because it's too late (see #23305).\n        this._selectionKeyPressed = true;\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  /** Handles keyup events on the calendar body when calendar is in year view. */\n  _handleCalendarBodyKeyup(event: KeyboardEvent): void {\n    if (event.keyCode === SPACE || event.keyCode === ENTER) {\n      if (this._selectionKeyPressed) {\n        this._monthSelected({value: this._dateAdapter.getMonth(this._activeDate), event});\n      }\n\n      this._selectionKeyPressed = false;\n    }\n  }\n\n  /** Initializes this year view. */\n  _init() {\n    this._setSelectedMonth(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    const date = this._dateAdapter.createDate(this._dateAdapter.getYear(this.activeDate), month, 1);\n    const ariaLabel = this._dateAdapter.format(date, this._dateFormats.display.monthYearA11yLabel);\n    const cellClasses = this.dateClass ? this.dateClass(date, 'year') : undefined;\n\n    return new MatCalendarCell(month, monthName.toLocaleUpperCase(), ariaLabel,\n        this._shouldEnableMonth(month), cellClasses);\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  /** 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-selected month based on a model value. */\n  private _setSelectedMonth(value: DateRange<D> | D | null) {\n    if (value instanceof DateRange) {\n      this._selectedMonth = this._getMonthInCurrentYear(value.start) ||\n                            this._getMonthInCurrentYear(value.end);\n    } else {\n      this._selectedMonth = this._getMonthInCurrentYear(value);\n    }\n  }\n}\n"]}
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