/**
 * @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 { DateAdapter } 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';
import { DateRange } from './date-selection-model';
export const yearsPerPage = 24;
export const yearsPerRow = 4;
/**
 * An internal component used to display a year selector in the datepicker.
 * @docs-private
 */
export class MatMultiYearView {
    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 && (typeof ngDevMode === 'undefined' || ngDevMode)) {
            throw createMissingDateImplError('DateAdapter');
        }
        this._activeDate = this._dateAdapter.today();
    }
    /** The date to display in this multi-year view (everything other than the year is ignored). */
    get activeDate() { return this._activeDate; }
    set activeDate(value) {
        let oldActiveDate = this._activeDate;
        const validDate = this._dateAdapter.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. */
    get selected() { return this._selected; }
    set selected(value) {
        if (value instanceof DateRange) {
            this._selected = value;
        }
        else {
            this._selected = this._dateAdapter.getValidDateOrNull(this._dateAdapter.deserialize(value));
        }
        this._setSelectedYear(value);
    }
    /** The minimum selectable date. */
    get minDate() { return this._minDate; }
    set minDate(value) {
        this._minDate = this._dateAdapter.getValidDateOrNull(this._dateAdapter.deserialize(value));
    }
    /** The maximum selectable date. */
    get maxDate() { return this._maxDate; }
    set maxDate(value) {
        this._maxDate = this._dateAdapter.getValidDateOrNull(this._dateAdapter.deserialize(value));
    }
    ngAfterContentInit() {
        this._rerenderSubscription = this._dateAdapter.localeChanges
            .pipe(startWith(null))
            .subscribe(() => this._init());
    }
    ngOnDestroy() {
        this._rerenderSubscription.unsubscribe();
    }
    /** Initializes this multi-year view. */
    _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.
        const activeYear = this._dateAdapter.getYear(this._activeDate);
        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(year => this._createCellForYear(year)));
                row = [];
            }
        }
        this._changeDetectorRef.markForCheck();
    }
    /** Handles when a new year is selected. */
    _yearSelected(event) {
        const year = event.value;
        this.yearSelected.emit(this._dateAdapter.createDate(year, 0, 1));
        let month = this._dateAdapter.getMonth(this.activeDate);
        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. */
    _handleCalendarBodyKeydown(event) {
        const oldActiveDate = this._activeDate;
        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:
                // Note that we only prevent the default action here while the selection happens in
                // `keyup` below. We can't do the selection here, because it can cause the calendar to
                // reopen if focus is restored immediately. We also can't call `preventDefault` on `keyup`
                // because it's too late (see #23305).
                this._selectionKeyPressed = true;
                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();
    }
    /** Handles keyup events on the calendar body when calendar is in multi-year view. */
    _handleCalendarBodyKeyup(event) {
        if (event.keyCode === SPACE || event.keyCode === ENTER) {
            if (this._selectionKeyPressed) {
                this._yearSelected({ value: this._dateAdapter.getYear(this._activeDate), event });
            }
            this._selectionKeyPressed = false;
        }
    }
    _getActiveCell() {
        return getActiveOffset(this._dateAdapter, this.activeDate, this.minDate, this.maxDate);
    }
    /** Focuses the active cell after the microtask queue is empty. */
    _focusActiveCell() {
        this._matCalendarBody._focusActiveCell();
    }
    /** Creates an MatCalendarCell for the given year. */
    _createCellForYear(year) {
        const date = this._dateAdapter.createDate(year, 0, 1);
        const yearName = this._dateAdapter.getYearName(date);
        const cellClasses = this.dateClass ? this.dateClass(date, 'multi-year') : undefined;
        return new MatCalendarCell(year, yearName, yearName, this._shouldEnableYear(year), cellClasses);
    }
    /** Whether the given year is enabled. */
    _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;
        }
        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;
    }
    /** Determines whether the user has the RTL layout direction. */
    _isRtl() {
        return this._dir && this._dir.value === 'rtl';
    }
    /** Sets the currently-highlighted year based on a model value. */
    _setSelectedYear(value) {
        this._selectedYear = null;
        if (value instanceof DateRange) {
            const displayValue = value.start || value.end;
            if (displayValue) {
                this._selectedYear = this._dateAdapter.getYear(displayValue);
            }
        }
        else if (value) {
            this._selectedYear = this._dateAdapter.getYear(value);
        }
    }
}
MatMultiYearView.decorators = [
    { type: Component, args: [{
                selector: 'mat-multi-year-view',
                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         [rows]=\"_years\"\n         [todayValue]=\"_todayYear\"\n         [startValue]=\"_selectedYear!\"\n         [endValue]=\"_selectedYear!\"\n         [numCols]=\"4\"\n         [cellAspectRatio]=\"4 / 7\"\n         [activeCell]=\"_getActiveCell()\"\n         (selectedValueChange)=\"_yearSelected($event)\"\n         (keyup)=\"_handleCalendarBodyKeyup($event)\"\n         (keydown)=\"_handleCalendarBodyKeydown($event)\">\n  </tbody>\n</table>\n",
                exportAs: 'matMultiYearView',
                encapsulation: ViewEncapsulation.None,
                changeDetection: ChangeDetectionStrategy.OnPush
            },] }
];
MatMultiYearView.ctorParameters = () => [
    { type: ChangeDetectorRef },
    { type: DateAdapter, decorators: [{ type: Optional }] },
    { type: Directionality, decorators: [{ type: Optional }] }
];
MatMultiYearView.propDecorators = {
    activeDate: [{ type: Input }],
    selected: [{ type: Input }],
    minDate: [{ type: Input }],
    maxDate: [{ type: Input }],
    dateFilter: [{ type: Input }],
    dateClass: [{ type: Input }],
    selectedChange: [{ type: Output }],
    yearSelected: [{ type: Output }],
    activeDateChange: [{ type: Output }],
    _matCalendarBody: [{ type: ViewChild, args: [MatCalendarBody,] }]
};
export function isSameMultiYearView(dateAdapter, date1, date2, minDate, maxDate) {
    const year1 = dateAdapter.getYear(date1);
    const year2 = dateAdapter.getYear(date2);
    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.
 */
export function getActiveOffset(dateAdapter, activeDate, minDate, maxDate) {
    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.
 */
function getStartingYear(dateAdapter, minDate, maxDate) {
    let startingYear = 0;
    if (maxDate) {
        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 */
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 {DateAdapter} 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\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: 'mat-multi-year-view',\n  templateUrl: 'multi-year-view.html',\n  exportAs: 'matMultiYearView',\n  encapsulation: ViewEncapsulation.None,\n  changeDetection: ChangeDetectionStrategy.OnPush\n})\nexport class MatMultiYearView<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 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._dateAdapter.getValidDateOrNull(\n        this._dateAdapter.deserialize(value)\n      ) || 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._dateAdapter.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._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 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(MatCalendarBody) _matCalendarBody: MatCalendarBody;\n\n  /** Grid of calendar cells representing the currently displayed years. */\n  _years: MatCalendarCell[][];\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: DateAdapter<D>,\n              @Optional() private _dir?: Directionality) {\n    if (!this._dateAdapter && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw createMissingDateImplError('DateAdapter');\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: MatCalendarUserEvent<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        // 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    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 multi-year view. */\n  _handleCalendarBodyKeyup(event: KeyboardEvent): void {\n    if (event.keyCode === SPACE || event.keyCode === ENTER) {\n      if (this._selectionKeyPressed) {\n        this._yearSelected({value: this._dateAdapter.getYear(this._activeDate), event});\n      }\n\n      this._selectionKeyPressed = false;\n    }\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    const date = this._dateAdapter.createDate(year, 0, 1);\n    const yearName = this._dateAdapter.getYearName(date);\n    const cellClasses = this.dateClass ? this.dateClass(date, 'multi-year') : undefined;\n\n    return new MatCalendarCell(year, yearName, yearName, this._shouldEnableYear(year), cellClasses);\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  /** 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: DateAdapter<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: DateAdapter<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: DateAdapter<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"]}