source: trip-planner-front/node_modules/@angular/material/fesm2015/select.js@ eed0bf8

import { Overlay, CdkConnectedOverlay, OverlayModule } from '@angular/cdk/overlay';
import { CommonModule } from '@angular/common';
import { InjectionToken, Directive, EventEmitter, ChangeDetectorRef, NgZone, ElementRef, Optional, Inject, Self, Attribute, ViewChild, Input, Output, Component, ViewEncapsulation, ChangeDetectionStrategy, ContentChildren, ContentChild, NgModule } from '@angular/core';
import { mixinDisableRipple, mixinTabIndex, mixinDisabled, mixinErrorState, ErrorStateMatcher, _countGroupLabelsBeforeOption, _getOptionScrollPosition, MAT_OPTION_PARENT_COMPONENT, MatOption, MAT_OPTGROUP, MatOptionModule, MatCommonModule } from '@angular/material/core';
import { MatFormField, MAT_FORM_FIELD, MatFormFieldControl, MatFormFieldModule } from '@angular/material/form-field';
import { ViewportRuler, CdkScrollableModule } from '@angular/cdk/scrolling';
import { ActiveDescendantKeyManager, LiveAnnouncer } from '@angular/cdk/a11y';
import { Directionality } from '@angular/cdk/bidi';
import { coerceBooleanProperty, coerceNumberProperty } from '@angular/cdk/coercion';
import { SelectionModel } from '@angular/cdk/collections';
import { DOWN_ARROW, UP_ARROW, LEFT_ARROW, RIGHT_ARROW, ENTER, SPACE, hasModifierKey, A } from '@angular/cdk/keycodes';
import { NgForm, FormGroupDirective, NgControl } from '@angular/forms';
import { Subject, defer, merge } from 'rxjs';
import { startWith, switchMap, take, filter, map, distinctUntilChanged, takeUntil } from 'rxjs/operators';
import { trigger, transition, query, animateChild, state, style, animate } from '@angular/animations';

/**
 * @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
 */
/**
 * The following are all the animations for the mat-select component, with each
 * const containing the metadata for one animation.
 *
 * The values below match the implementation of the AngularJS Material mat-select animation.
 * @docs-private
 */
const matSelectAnimations = {
    /**
     * This animation ensures the select's overlay panel animation (transformPanel) is called when
     * closing the select.
     * This is needed due to https://github.com/angular/angular/issues/23302
     */
    transformPanelWrap: trigger('transformPanelWrap', [
        transition('* => void', query('@transformPanel', [animateChild()], { optional: true }))
    ]),
    /**
     * This animation transforms the select's overlay panel on and off the page.
     *
     * When the panel is attached to the DOM, it expands its width by the amount of padding, scales it
     * up to 100% on the Y axis, fades in its border, and translates slightly up and to the
     * side to ensure the option text correctly overlaps the trigger text.
     *
     * When the panel is removed from the DOM, it simply fades out linearly.
     */
    transformPanel: trigger('transformPanel', [
        state('void', style({
            transform: 'scaleY(0.8)',
            minWidth: '100%',
            opacity: 0
        })),
        state('showing', style({
            opacity: 1,
            minWidth: 'calc(100% + 32px)',
            transform: 'scaleY(1)'
        })),
        state('showing-multiple', style({
            opacity: 1,
            minWidth: 'calc(100% + 64px)',
            transform: 'scaleY(1)'
        })),
        transition('void => *', animate('120ms cubic-bezier(0, 0, 0.2, 1)')),
        transition('* => void', animate('100ms 25ms linear', style({ opacity: 0 })))
    ])
};

/**
 * @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
 */
/**
 * Returns an exception to be thrown when attempting to change a select's `multiple` option
 * after initialization.
 * @docs-private
 */
function getMatSelectDynamicMultipleError() {
    return Error('Cannot change `multiple` mode of select after initialization.');
}
/**
 * Returns an exception to be thrown when attempting to assign a non-array value to a select
 * in `multiple` mode. Note that `undefined` and `null` are still valid values to allow for
 * resetting the value.
 * @docs-private
 */
function getMatSelectNonArrayValueError() {
    return Error('Value must be an array in multiple-selection mode.');
}
/**
 * Returns an exception to be thrown when assigning a non-function value to the comparator
 * used to determine if a value corresponds to an option. Note that whether the function
 * actually takes two values and returns a boolean is not checked.
 */
function getMatSelectNonFunctionValueError() {
    return Error('`compareWith` must be a function.');
}

/**
 * @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
 */
let nextUniqueId = 0;
/**
 * The following style constants are necessary to save here in order
 * to properly calculate the alignment of the selected option over
 * the trigger element.
 */
/** The max height of the select's overlay panel. */
const SELECT_PANEL_MAX_HEIGHT = 256;
/** The panel's padding on the x-axis. */
const SELECT_PANEL_PADDING_X = 16;
/** The panel's x axis padding if it is indented (e.g. there is an option group). */
const SELECT_PANEL_INDENT_PADDING_X = SELECT_PANEL_PADDING_X * 2;
/** The height of the select items in `em` units. */
const SELECT_ITEM_HEIGHT_EM = 3;
// TODO(josephperrott): Revert to a constant after 2018 spec updates are fully merged.
/**
 * Distance between the panel edge and the option text in
 * multi-selection mode.
 *
 * Calculated as:
 * (SELECT_PANEL_PADDING_X * 1.5) + 16 = 40
 * The padding is multiplied by 1.5 because the checkbox's margin is half the padding.
 * The checkbox width is 16px.
 */
const SELECT_MULTIPLE_PANEL_PADDING_X = SELECT_PANEL_PADDING_X * 1.5 + 16;
/**
 * The select panel will only "fit" inside the viewport if it is positioned at
 * this value or more away from the viewport boundary.
 */
const SELECT_PANEL_VIEWPORT_PADDING = 8;
/** Injection token that determines the scroll handling while a select is open. */
const MAT_SELECT_SCROLL_STRATEGY = new InjectionToken('mat-select-scroll-strategy');
/** @docs-private */
function MAT_SELECT_SCROLL_STRATEGY_PROVIDER_FACTORY(overlay) {
    return () => overlay.scrollStrategies.reposition();
}
/** Injection token that can be used to provide the default options the select module. */
const MAT_SELECT_CONFIG = new InjectionToken('MAT_SELECT_CONFIG');
/** @docs-private */
const MAT_SELECT_SCROLL_STRATEGY_PROVIDER = {
    provide: MAT_SELECT_SCROLL_STRATEGY,
    deps: [Overlay],
    useFactory: MAT_SELECT_SCROLL_STRATEGY_PROVIDER_FACTORY,
};
/** Change event object that is emitted when the select value has changed. */
class MatSelectChange {
    constructor(
    /** Reference to the select that emitted the change event. */
    source, 
    /** Current value of the select that emitted the event. */
    value) {
        this.source = source;
        this.value = value;
    }
}
// Boilerplate for applying mixins to MatSelect.
/** @docs-private */
const _MatSelectMixinBase = mixinDisableRipple(mixinTabIndex(mixinDisabled(mixinErrorState(class {
    constructor(_elementRef, _defaultErrorStateMatcher, _parentForm, _parentFormGroup, ngControl) {
        this._elementRef = _elementRef;
        this._defaultErrorStateMatcher = _defaultErrorStateMatcher;
        this._parentForm = _parentForm;
        this._parentFormGroup = _parentFormGroup;
        this.ngControl = ngControl;
    }
}))));
/**
 * Injection token that can be used to reference instances of `MatSelectTrigger`. It serves as
 * alternative token to the actual `MatSelectTrigger` class which could cause unnecessary
 * retention of the class and its directive metadata.
 */
const MAT_SELECT_TRIGGER = new InjectionToken('MatSelectTrigger');
/**
 * Allows the user to customize the trigger that is displayed when the select has a value.
 */
class MatSelectTrigger {
}
MatSelectTrigger.decorators = [
    { type: Directive, args: [{
                selector: 'mat-select-trigger',
                providers: [{ provide: MAT_SELECT_TRIGGER, useExisting: MatSelectTrigger }],
            },] }
];
/** Base class with all of the `MatSelect` functionality. */
class _MatSelectBase extends _MatSelectMixinBase {
    constructor(_viewportRuler, _changeDetectorRef, _ngZone, _defaultErrorStateMatcher, elementRef, _dir, _parentForm, _parentFormGroup, _parentFormField, ngControl, tabIndex, scrollStrategyFactory, _liveAnnouncer, _defaultOptions) {
        var _a, _b, _c;
        super(elementRef, _defaultErrorStateMatcher, _parentForm, _parentFormGroup, ngControl);
        this._viewportRuler = _viewportRuler;
        this._changeDetectorRef = _changeDetectorRef;
        this._ngZone = _ngZone;
        this._dir = _dir;
        this._parentFormField = _parentFormField;
        this._liveAnnouncer = _liveAnnouncer;
        this._defaultOptions = _defaultOptions;
        /** Whether or not the overlay panel is open. */
        this._panelOpen = false;
        /** Comparison function to specify which option is displayed. Defaults to object equality. */
        this._compareWith = (o1, o2) => o1 === o2;
        /** Unique id for this input. */
        this._uid = `mat-select-${nextUniqueId++}`;
        /** Current `ariar-labelledby` value for the select trigger. */
        this._triggerAriaLabelledBy = null;
        /** Emits whenever the component is destroyed. */
        this._destroy = new Subject();
        /** `View -> model callback called when value changes` */
        this._onChange = () => { };
        /** `View -> model callback called when select has been touched` */
        this._onTouched = () => { };
        /** ID for the DOM node containing the select's value. */
        this._valueId = `mat-select-value-${nextUniqueId++}`;
        /** Emits when the panel element is finished transforming in. */
        this._panelDoneAnimatingStream = new Subject();
        this._overlayPanelClass = ((_a = this._defaultOptions) === null || _a === void 0 ? void 0 : _a.overlayPanelClass) || '';
        this._focused = false;
        /** A name for this control that can be used by `mat-form-field`. */
        this.controlType = 'mat-select';
        this._required = false;
        this._multiple = false;
        this._disableOptionCentering = (_c = (_b = this._defaultOptions) === null || _b === void 0 ? void 0 : _b.disableOptionCentering) !== null && _c !== void 0 ? _c : false;
        /** Aria label of the select. */
        this.ariaLabel = '';
        /** Combined stream of all of the child options' change events. */
        this.optionSelectionChanges = defer(() => {
            const options = this.options;
            if (options) {
                return options.changes.pipe(startWith(options), switchMap(() => merge(...options.map(option => option.onSelectionChange))));
            }
            return this._ngZone.onStable
                .pipe(take(1), switchMap(() => this.optionSelectionChanges));
        });
        /** Event emitted when the select panel has been toggled. */
        this.openedChange = new EventEmitter();
        /** Event emitted when the select has been opened. */
        this._openedStream = this.openedChange.pipe(filter(o => o), map(() => { }));
        /** Event emitted when the select has been closed. */
        this._closedStream = this.openedChange.pipe(filter(o => !o), map(() => { }));
        /** Event emitted when the selected value has been changed by the user. */
        this.selectionChange = new EventEmitter();
        /**
         * Event that emits whenever the raw value of the select changes. This is here primarily
         * to facilitate the two-way binding for the `value` input.
         * @docs-private
         */
        this.valueChange = new EventEmitter();
        if (this.ngControl) {
            // Note: we provide the value accessor through here, instead of
            // the `providers` to avoid running into a circular import.
            this.ngControl.valueAccessor = this;
        }
        // Note that we only want to set this when the defaults pass it in, otherwise it should
        // stay as `undefined` so that it falls back to the default in the key manager.
        if ((_defaultOptions === null || _defaultOptions === void 0 ? void 0 : _defaultOptions.typeaheadDebounceInterval) != null) {
            this._typeaheadDebounceInterval = _defaultOptions.typeaheadDebounceInterval;
        }
        this._scrollStrategyFactory = scrollStrategyFactory;
        this._scrollStrategy = this._scrollStrategyFactory();
        this.tabIndex = parseInt(tabIndex) || 0;
        // Force setter to be called in case id was not specified.
        this.id = this.id;
    }
    /** Whether the select is focused. */
    get focused() {
        return this._focused || this._panelOpen;
    }
    /** Placeholder to be shown if no value has been selected. */
    get placeholder() { return this._placeholder; }
    set placeholder(value) {
        this._placeholder = value;
        this.stateChanges.next();
    }
    /** Whether the component is required. */
    get required() { return this._required; }
    set required(value) {
        this._required = coerceBooleanProperty(value);
        this.stateChanges.next();
    }
    /** Whether the user should be allowed to select multiple options. */
    get multiple() { return this._multiple; }
    set multiple(value) {
        if (this._selectionModel && (typeof ngDevMode === 'undefined' || ngDevMode)) {
            throw getMatSelectDynamicMultipleError();
        }
        this._multiple = coerceBooleanProperty(value);
    }
    /** Whether to center the active option over the trigger. */
    get disableOptionCentering() { return this._disableOptionCentering; }
    set disableOptionCentering(value) {
        this._disableOptionCentering = coerceBooleanProperty(value);
    }
    /**
     * Function to compare the option values with the selected values. The first argument
     * is a value from an option. The second is a value from the selection. A boolean
     * should be returned.
     */
    get compareWith() { return this._compareWith; }
    set compareWith(fn) {
        if (typeof fn !== 'function' && (typeof ngDevMode === 'undefined' || ngDevMode)) {
            throw getMatSelectNonFunctionValueError();
        }
        this._compareWith = fn;
        if (this._selectionModel) {
            // A different comparator means the selection could change.
            this._initializeSelection();
        }
    }
    /** Value of the select control. */
    get value() { return this._value; }
    set value(newValue) {
        // Always re-assign an array, because it might have been mutated.
        if (newValue !== this._value || (this._multiple && Array.isArray(newValue))) {
            if (this.options) {
                this._setSelectionByValue(newValue);
            }
            this._value = newValue;
        }
    }
    /** Time to wait in milliseconds after the last keystroke before moving focus to an item. */
    get typeaheadDebounceInterval() { return this._typeaheadDebounceInterval; }
    set typeaheadDebounceInterval(value) {
        this._typeaheadDebounceInterval = coerceNumberProperty(value);
    }
    /** Unique id of the element. */
    get id() { return this._id; }
    set id(value) {
        this._id = value || this._uid;
        this.stateChanges.next();
    }
    ngOnInit() {
        this._selectionModel = new SelectionModel(this.multiple);
        this.stateChanges.next();
        // We need `distinctUntilChanged` here, because some browsers will
        // fire the animation end event twice for the same animation. See:
        // https://github.com/angular/angular/issues/24084
        this._panelDoneAnimatingStream
            .pipe(distinctUntilChanged(), takeUntil(this._destroy))
            .subscribe(() => this._panelDoneAnimating(this.panelOpen));
    }
    ngAfterContentInit() {
        this._initKeyManager();
        this._selectionModel.changed.pipe(takeUntil(this._destroy)).subscribe(event => {
            event.added.forEach(option => option.select());
            event.removed.forEach(option => option.deselect());
        });
        this.options.changes.pipe(startWith(null), takeUntil(this._destroy)).subscribe(() => {
            this._resetOptions();
            this._initializeSelection();
        });
    }
    ngDoCheck() {
        const newAriaLabelledby = this._getTriggerAriaLabelledby();
        // We have to manage setting the `aria-labelledby` ourselves, because part of its value
        // is computed as a result of a content query which can cause this binding to trigger a
        // "changed after checked" error.
        if (newAriaLabelledby !== this._triggerAriaLabelledBy) {
            const element = this._elementRef.nativeElement;
            this._triggerAriaLabelledBy = newAriaLabelledby;
            if (newAriaLabelledby) {
                element.setAttribute('aria-labelledby', newAriaLabelledby);
            }
            else {
                element.removeAttribute('aria-labelledby');
            }
        }
        if (this.ngControl) {
            this.updateErrorState();
        }
    }
    ngOnChanges(changes) {
        // Updating the disabled state is handled by `mixinDisabled`, but we need to additionally let
        // the parent form field know to run change detection when the disabled state changes.
        if (changes['disabled']) {
            this.stateChanges.next();
        }
        if (changes['typeaheadDebounceInterval'] && this._keyManager) {
            this._keyManager.withTypeAhead(this._typeaheadDebounceInterval);
        }
    }
    ngOnDestroy() {
        this._destroy.next();
        this._destroy.complete();
        this.stateChanges.complete();
    }
    /** Toggles the overlay panel open or closed. */
    toggle() {
        this.panelOpen ? this.close() : this.open();
    }
    /** Opens the overlay panel. */
    open() {
        if (this._canOpen()) {
            this._panelOpen = true;
            this._keyManager.withHorizontalOrientation(null);
            this._highlightCorrectOption();
            this._changeDetectorRef.markForCheck();
        }
    }
    /** Closes the overlay panel and focuses the host element. */
    close() {
        if (this._panelOpen) {
            this._panelOpen = false;
            this._keyManager.withHorizontalOrientation(this._isRtl() ? 'rtl' : 'ltr');
            this._changeDetectorRef.markForCheck();
            this._onTouched();
        }
    }
    /**
     * Sets the select's value. Part of the ControlValueAccessor interface
     * required to integrate with Angular's core forms API.
     *
     * @param value New value to be written to the model.
     */
    writeValue(value) {
        this.value = value;
    }
    /**
     * Saves a callback function to be invoked when the select's value
     * changes from user input. Part of the ControlValueAccessor interface
     * required to integrate with Angular's core forms API.
     *
     * @param fn Callback to be triggered when the value changes.
     */
    registerOnChange(fn) {
        this._onChange = fn;
    }
    /**
     * Saves a callback function to be invoked when the select is blurred
     * by the user. Part of the ControlValueAccessor interface required
     * to integrate with Angular's core forms API.
     *
     * @param fn Callback to be triggered when the component has been touched.
     */
    registerOnTouched(fn) {
        this._onTouched = fn;
    }
    /**
     * Disables the select. Part of the ControlValueAccessor interface required
     * to integrate with Angular's core forms API.
     *
     * @param isDisabled Sets whether the component is disabled.
     */
    setDisabledState(isDisabled) {
        this.disabled = isDisabled;
        this._changeDetectorRef.markForCheck();
        this.stateChanges.next();
    }
    /** Whether or not the overlay panel is open. */
    get panelOpen() {
        return this._panelOpen;
    }
    /** The currently selected option. */
    get selected() {
        var _a, _b;
        return this.multiple ? (((_a = this._selectionModel) === null || _a === void 0 ? void 0 : _a.selected) || []) :
            (_b = this._selectionModel) === null || _b === void 0 ? void 0 : _b.selected[0];
    }
    /** The value displayed in the trigger. */
    get triggerValue() {
        if (this.empty) {
            return '';
        }
        if (this._multiple) {
            const selectedOptions = this._selectionModel.selected.map(option => option.viewValue);
            if (this._isRtl()) {
                selectedOptions.reverse();
            }
            // TODO(crisbeto): delimiter should be configurable for proper localization.
            return selectedOptions.join(', ');
        }
        return this._selectionModel.selected[0].viewValue;
    }
    /** Whether the element is in RTL mode. */
    _isRtl() {
        return this._dir ? this._dir.value === 'rtl' : false;
    }
    /** Handles all keydown events on the select. */
    _handleKeydown(event) {
        if (!this.disabled) {
            this.panelOpen ? this._handleOpenKeydown(event) : this._handleClosedKeydown(event);
        }
    }
    /** Handles keyboard events while the select is closed. */
    _handleClosedKeydown(event) {
        const keyCode = event.keyCode;
        const isArrowKey = keyCode === DOWN_ARROW || keyCode === UP_ARROW ||
            keyCode === LEFT_ARROW || keyCode === RIGHT_ARROW;
        const isOpenKey = keyCode === ENTER || keyCode === SPACE;
        const manager = this._keyManager;
        // Open the select on ALT + arrow key to match the native <select>
        if (!manager.isTyping() && (isOpenKey && !hasModifierKey(event)) ||
            ((this.multiple || event.altKey) && isArrowKey)) {
            event.preventDefault(); // prevents the page from scrolling down when pressing space
            this.open();
        }
        else if (!this.multiple) {
            const previouslySelectedOption = this.selected;
            manager.onKeydown(event);
            const selectedOption = this.selected;
            // Since the value has changed, we need to announce it ourselves.
            if (selectedOption && previouslySelectedOption !== selectedOption) {
                // We set a duration on the live announcement, because we want the live element to be
                // cleared after a while so that users can't navigate to it using the arrow keys.
                this._liveAnnouncer.announce(selectedOption.viewValue, 10000);
            }
        }
    }
    /** Handles keyboard events when the selected is open. */
    _handleOpenKeydown(event) {
        const manager = this._keyManager;
        const keyCode = event.keyCode;
        const isArrowKey = keyCode === DOWN_ARROW || keyCode === UP_ARROW;
        const isTyping = manager.isTyping();
        if (isArrowKey && event.altKey) {
            // Close the select on ALT + arrow key to match the native <select>
            event.preventDefault();
            this.close();
            // Don't do anything in this case if the user is typing,
            // because the typing sequence can include the space key.
        }
        else if (!isTyping && (keyCode === ENTER || keyCode === SPACE) && manager.activeItem &&
            !hasModifierKey(event)) {
            event.preventDefault();
            manager.activeItem._selectViaInteraction();
        }
        else if (!isTyping && this._multiple && keyCode === A && event.ctrlKey) {
            event.preventDefault();
            const hasDeselectedOptions = this.options.some(opt => !opt.disabled && !opt.selected);
            this.options.forEach(option => {
                if (!option.disabled) {
                    hasDeselectedOptions ? option.select() : option.deselect();
                }
            });
        }
        else {
            const previouslyFocusedIndex = manager.activeItemIndex;
            manager.onKeydown(event);
            if (this._multiple && isArrowKey && event.shiftKey && manager.activeItem &&
                manager.activeItemIndex !== previouslyFocusedIndex) {
                manager.activeItem._selectViaInteraction();
            }
        }
    }
    _onFocus() {
        if (!this.disabled) {
            this._focused = true;
            this.stateChanges.next();
        }
    }
    /**
     * Calls the touched callback only if the panel is closed. Otherwise, the trigger will
     * "blur" to the panel when it opens, causing a false positive.
     */
    _onBlur() {
        this._focused = false;
        if (!this.disabled && !this.panelOpen) {
            this._onTouched();
            this._changeDetectorRef.markForCheck();
            this.stateChanges.next();
        }
    }
    /**
     * Callback that is invoked when the overlay panel has been attached.
     */
    _onAttached() {
        this._overlayDir.positionChange.pipe(take(1)).subscribe(() => {
            this._changeDetectorRef.detectChanges();
            this._positioningSettled();
        });
    }
    /** Returns the theme to be used on the panel. */
    _getPanelTheme() {
        return this._parentFormField ? `mat-${this._parentFormField.color}` : '';
    }
    /** Whether the select has a value. */
    get empty() {
        return !this._selectionModel || this._selectionModel.isEmpty();
    }
    _initializeSelection() {
        // Defer setting the value in order to avoid the "Expression
        // has changed after it was checked" errors from Angular.
        Promise.resolve().then(() => {
            this._setSelectionByValue(this.ngControl ? this.ngControl.value : this._value);
            this.stateChanges.next();
        });
    }
    /**
     * Sets the selected option based on a value. If no option can be
     * found with the designated value, the select trigger is cleared.
     */
    _setSelectionByValue(value) {
        this._selectionModel.selected.forEach(option => option.setInactiveStyles());
        this._selectionModel.clear();
        if (this.multiple && value) {
            if (!Array.isArray(value) && (typeof ngDevMode === 'undefined' || ngDevMode)) {
                throw getMatSelectNonArrayValueError();
            }
            value.forEach((currentValue) => this._selectValue(currentValue));
            this._sortValues();
        }
        else {
            const correspondingOption = this._selectValue(value);
            // Shift focus to the active item. Note that we shouldn't do this in multiple
            // mode, because we don't know what option the user interacted with last.
            if (correspondingOption) {
                this._keyManager.updateActiveItem(correspondingOption);
            }
            else if (!this.panelOpen) {
                // Otherwise reset the highlighted option. Note that we only want to do this while
                // closed, because doing it while open can shift the user's focus unnecessarily.
                this._keyManager.updateActiveItem(-1);
            }
        }
        this._changeDetectorRef.markForCheck();
    }
    /**
     * Finds and selects and option based on its value.
     * @returns Option that has the corresponding value.
     */
    _selectValue(value) {
        const correspondingOption = this.options.find((option) => {
            // Skip options that are already in the model. This allows us to handle cases
            // where the same primitive value is selected multiple times.
            if (this._selectionModel.isSelected(option)) {
                return false;
            }
            try {
                // Treat null as a special reset value.
                return option.value != null && this._compareWith(option.value, value);
            }
            catch (error) {
                if (typeof ngDevMode === 'undefined' || ngDevMode) {
                    // Notify developers of errors in their comparator.
                    console.warn(error);
                }
                return false;
            }
        });
        if (correspondingOption) {
            this._selectionModel.select(correspondingOption);
        }
        return correspondingOption;
    }
    /** Sets up a key manager to listen to keyboard events on the overlay panel. */
    _initKeyManager() {
        this._keyManager = new ActiveDescendantKeyManager(this.options)
            .withTypeAhead(this._typeaheadDebounceInterval)
            .withVerticalOrientation()
            .withHorizontalOrientation(this._isRtl() ? 'rtl' : 'ltr')
            .withHomeAndEnd()
            .withAllowedModifierKeys(['shiftKey']);
        this._keyManager.tabOut.pipe(takeUntil(this._destroy)).subscribe(() => {
            if (this.panelOpen) {
                // Select the active item when tabbing away. This is consistent with how the native
                // select behaves. Note that we only want to do this in single selection mode.
                if (!this.multiple && this._keyManager.activeItem) {
                    this._keyManager.activeItem._selectViaInteraction();
                }
                // Restore focus to the trigger before closing. Ensures that the focus
                // position won't be lost if the user got focus into the overlay.
                this.focus();
                this.close();
            }
        });
        this._keyManager.change.pipe(takeUntil(this._destroy)).subscribe(() => {
            if (this._panelOpen && this.panel) {
                this._scrollOptionIntoView(this._keyManager.activeItemIndex || 0);
            }
            else if (!this._panelOpen && !this.multiple && this._keyManager.activeItem) {
                this._keyManager.activeItem._selectViaInteraction();
            }
        });
    }
    /** Drops current option subscriptions and IDs and resets from scratch. */
    _resetOptions() {
        const changedOrDestroyed = merge(this.options.changes, this._destroy);
        this.optionSelectionChanges.pipe(takeUntil(changedOrDestroyed)).subscribe(event => {
            this._onSelect(event.source, event.isUserInput);
            if (event.isUserInput && !this.multiple && this._panelOpen) {
                this.close();
                this.focus();
            }
        });
        // Listen to changes in the internal state of the options and react accordingly.
        // Handles cases like the labels of the selected options changing.
        merge(...this.options.map(option => option._stateChanges))
            .pipe(takeUntil(changedOrDestroyed))
            .subscribe(() => {
            this._changeDetectorRef.markForCheck();
            this.stateChanges.next();
        });
    }
    /** Invoked when an option is clicked. */
    _onSelect(option, isUserInput) {
        const wasSelected = this._selectionModel.isSelected(option);
        if (option.value == null && !this._multiple) {
            option.deselect();
            this._selectionModel.clear();
            if (this.value != null) {
                this._propagateChanges(option.value);
            }
        }
        else {
            if (wasSelected !== option.selected) {
                option.selected ? this._selectionModel.select(option) :
                    this._selectionModel.deselect(option);
            }
            if (isUserInput) {
                this._keyManager.setActiveItem(option);
            }
            if (this.multiple) {
                this._sortValues();
                if (isUserInput) {
                    // In case the user selected the option with their mouse, we
                    // want to restore focus back to the trigger, in order to
                    // prevent the select keyboard controls from clashing with
                    // the ones from `mat-option`.
                    this.focus();
                }
            }
        }
        if (wasSelected !== this._selectionModel.isSelected(option)) {
            this._propagateChanges();
        }
        this.stateChanges.next();
    }
    /** Sorts the selected values in the selected based on their order in the panel. */
    _sortValues() {
        if (this.multiple) {
            const options = this.options.toArray();
            this._selectionModel.sort((a, b) => {
                return this.sortComparator ? this.sortComparator(a, b, options) :
                    options.indexOf(a) - options.indexOf(b);
            });
            this.stateChanges.next();
        }
    }
    /** Emits change event to set the model value. */
    _propagateChanges(fallbackValue) {
        let valueToEmit = null;
        if (this.multiple) {
            valueToEmit = this.selected.map(option => option.value);
        }
        else {
            valueToEmit = this.selected ? this.selected.value : fallbackValue;
        }
        this._value = valueToEmit;
        this.valueChange.emit(valueToEmit);
        this._onChange(valueToEmit);
        this.selectionChange.emit(this._getChangeEvent(valueToEmit));
        this._changeDetectorRef.markForCheck();
    }
    /**
     * Highlights the selected item. If no option is selected, it will highlight
     * the first item instead.
     */
    _highlightCorrectOption() {
        if (this._keyManager) {
            if (this.empty) {
                this._keyManager.setFirstItemActive();
            }
            else {
                this._keyManager.setActiveItem(this._selectionModel.selected[0]);
            }
        }
    }
    /** Whether the panel is allowed to open. */
    _canOpen() {
        var _a;
        return !this._panelOpen && !this.disabled && ((_a = this.options) === null || _a === void 0 ? void 0 : _a.length) > 0;
    }
    /** Focuses the select element. */
    focus(options) {
        this._elementRef.nativeElement.focus(options);
    }
    /** Gets the aria-labelledby for the select panel. */
    _getPanelAriaLabelledby() {
        var _a;
        if (this.ariaLabel) {
            return null;
        }
        const labelId = (_a = this._parentFormField) === null || _a === void 0 ? void 0 : _a.getLabelId();
        const labelExpression = (labelId ? labelId + ' ' : '');
        return this.ariaLabelledby ? labelExpression + this.ariaLabelledby : labelId;
    }
    /** Determines the `aria-activedescendant` to be set on the host. */
    _getAriaActiveDescendant() {
        if (this.panelOpen && this._keyManager && this._keyManager.activeItem) {
            return this._keyManager.activeItem.id;
        }
        return null;
    }
    /** Gets the aria-labelledby of the select component trigger. */
    _getTriggerAriaLabelledby() {
        var _a;
        if (this.ariaLabel) {
            return null;
        }
        const labelId = (_a = this._parentFormField) === null || _a === void 0 ? void 0 : _a.getLabelId();
        let value = (labelId ? labelId + ' ' : '') + this._valueId;
        if (this.ariaLabelledby) {
            value += ' ' + this.ariaLabelledby;
        }
        return value;
    }
    /** Called when the overlay panel is done animating. */
    _panelDoneAnimating(isOpen) {
        this.openedChange.emit(isOpen);
    }
    /**
     * Implemented as part of MatFormFieldControl.
     * @docs-private
     */
    setDescribedByIds(ids) {
        this._ariaDescribedby = ids.join(' ');
    }
    /**
     * Implemented as part of MatFormFieldControl.
     * @docs-private
     */
    onContainerClick() {
        this.focus();
        this.open();
    }
    /**
     * Implemented as part of MatFormFieldControl.
     * @docs-private
     */
    get shouldLabelFloat() {
        return this._panelOpen || !this.empty || (this._focused && !!this._placeholder);
    }
}
_MatSelectBase.decorators = [
    { type: Directive }
];
_MatSelectBase.ctorParameters = () => [
    { type: ViewportRuler },
    { type: ChangeDetectorRef },
    { type: NgZone },
    { type: ErrorStateMatcher },
    { type: ElementRef },
    { type: Directionality, decorators: [{ type: Optional }] },
    { type: NgForm, decorators: [{ type: Optional }] },
    { type: FormGroupDirective, decorators: [{ type: Optional }] },
    { type: MatFormField, decorators: [{ type: Optional }, { type: Inject, args: [MAT_FORM_FIELD,] }] },
    { type: NgControl, decorators: [{ type: Self }, { type: Optional }] },
    { type: String, decorators: [{ type: Attribute, args: ['tabindex',] }] },
    { type: undefined, decorators: [{ type: Inject, args: [MAT_SELECT_SCROLL_STRATEGY,] }] },
    { type: LiveAnnouncer },
    { type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [MAT_SELECT_CONFIG,] }] }
];
_MatSelectBase.propDecorators = {
    trigger: [{ type: ViewChild, args: ['trigger',] }],
    panel: [{ type: ViewChild, args: ['panel',] }],
    _overlayDir: [{ type: ViewChild, args: [CdkConnectedOverlay,] }],
    panelClass: [{ type: Input }],
    placeholder: [{ type: Input }],
    required: [{ type: Input }],
    multiple: [{ type: Input }],
    disableOptionCentering: [{ type: Input }],
    compareWith: [{ type: Input }],
    value: [{ type: Input }],
    ariaLabel: [{ type: Input, args: ['aria-label',] }],
    ariaLabelledby: [{ type: Input, args: ['aria-labelledby',] }],
    errorStateMatcher: [{ type: Input }],
    typeaheadDebounceInterval: [{ type: Input }],
    sortComparator: [{ type: Input }],
    id: [{ type: Input }],
    openedChange: [{ type: Output }],
    _openedStream: [{ type: Output, args: ['opened',] }],
    _closedStream: [{ type: Output, args: ['closed',] }],
    selectionChange: [{ type: Output }],
    valueChange: [{ type: Output }]
};
class MatSelect extends _MatSelectBase {
    constructor() {
        super(...arguments);
        /** The scroll position of the overlay panel, calculated to center the selected option. */
        this._scrollTop = 0;
        /** The cached font-size of the trigger element. */
        this._triggerFontSize = 0;
        /** The value of the select panel's transform-origin property. */
        this._transformOrigin = 'top';
        /**
         * The y-offset of the overlay panel in relation to the trigger's top start corner.
         * This must be adjusted to align the selected option text over the trigger text.
         * when the panel opens. Will change based on the y-position of the selected option.
         */
        this._offsetY = 0;
        this._positions = [
            {
                originX: 'start',
                originY: 'top',
                overlayX: 'start',
                overlayY: 'top',
            },
            {
                originX: 'start',
                originY: 'bottom',
                overlayX: 'start',
                overlayY: 'bottom',
            },
        ];
    }
    /**
     * Calculates the scroll position of the select's overlay panel.
     *
     * Attempts to center the selected option in the panel. If the option is
     * too high or too low in the panel to be scrolled to the center, it clamps the
     * scroll position to the min or max scroll positions respectively.
     */
    _calculateOverlayScroll(selectedIndex, scrollBuffer, maxScroll) {
        const itemHeight = this._getItemHeight();
        const optionOffsetFromScrollTop = itemHeight * selectedIndex;
        const halfOptionHeight = itemHeight / 2;
        // Starts at the optionOffsetFromScrollTop, which scrolls the option to the top of the
        // scroll container, then subtracts the scroll buffer to scroll the option down to
        // the center of the overlay panel. Half the option height must be re-added to the
        // scrollTop so the option is centered based on its middle, not its top edge.
        const optimalScrollPosition = optionOffsetFromScrollTop - scrollBuffer + halfOptionHeight;
        return Math.min(Math.max(0, optimalScrollPosition), maxScroll);
    }
    ngOnInit() {
        super.ngOnInit();
        this._viewportRuler.change().pipe(takeUntil(this._destroy)).subscribe(() => {
            if (this.panelOpen) {
                this._triggerRect = this.trigger.nativeElement.getBoundingClientRect();
                this._changeDetectorRef.markForCheck();
            }
        });
    }
    open() {
        if (super._canOpen()) {
            super.open();
            this._triggerRect = this.trigger.nativeElement.getBoundingClientRect();
            // Note: The computed font-size will be a string pixel value (e.g. "16px").
            // `parseInt` ignores the trailing 'px' and converts this to a number.
            this._triggerFontSize =
                parseInt(getComputedStyle(this.trigger.nativeElement).fontSize || '0');
            this._calculateOverlayPosition();
            // Set the font size on the panel element once it exists.
            this._ngZone.onStable.pipe(take(1)).subscribe(() => {
                if (this._triggerFontSize && this._overlayDir.overlayRef &&
                    this._overlayDir.overlayRef.overlayElement) {
                    this._overlayDir.overlayRef.overlayElement.style.fontSize = `${this._triggerFontSize}px`;
                }
            });
        }
    }
    /** Scrolls the active option into view. */
    _scrollOptionIntoView(index) {
        const labelCount = _countGroupLabelsBeforeOption(index, this.options, this.optionGroups);
        const itemHeight = this._getItemHeight();
        if (index === 0 && labelCount === 1) {
            // If we've got one group label before the option and we're at the top option,
            // scroll the list to the top. This is better UX than scrolling the list to the
            // top of the option, because it allows the user to read the top group's label.
            this.panel.nativeElement.scrollTop = 0;
        }
        else {
            this.panel.nativeElement.scrollTop = _getOptionScrollPosition((index + labelCount) * itemHeight, itemHeight, this.panel.nativeElement.scrollTop, SELECT_PANEL_MAX_HEIGHT);
        }
    }
    _positioningSettled() {
        this._calculateOverlayOffsetX();
        this.panel.nativeElement.scrollTop = this._scrollTop;
    }
    _panelDoneAnimating(isOpen) {
        if (this.panelOpen) {
            this._scrollTop = 0;
        }
        else {
            this._overlayDir.offsetX = 0;
            this._changeDetectorRef.markForCheck();
        }
        super._panelDoneAnimating(isOpen);
    }
    _getChangeEvent(value) {
        return new MatSelectChange(this, value);
    }
    /**
     * Sets the x-offset of the overlay panel in relation to the trigger's top start corner.
     * This must be adjusted to align the selected option text over the trigger text when
     * the panel opens. Will change based on LTR or RTL text direction. Note that the offset
     * can't be calculated until the panel has been attached, because we need to know the
     * content width in order to constrain the panel within the viewport.
     */
    _calculateOverlayOffsetX() {
        const overlayRect = this._overlayDir.overlayRef.overlayElement.getBoundingClientRect();
        const viewportSize = this._viewportRuler.getViewportSize();
        const isRtl = this._isRtl();
        const paddingWidth = this.multiple ? SELECT_MULTIPLE_PANEL_PADDING_X + SELECT_PANEL_PADDING_X :
            SELECT_PANEL_PADDING_X * 2;
        let offsetX;
        // Adjust the offset, depending on the option padding.
        if (this.multiple) {
            offsetX = SELECT_MULTIPLE_PANEL_PADDING_X;
        }
        else if (this.disableOptionCentering) {
            offsetX = SELECT_PANEL_PADDING_X;
        }
        else {
            let selected = this._selectionModel.selected[0] || this.options.first;
            offsetX = selected && selected.group ? SELECT_PANEL_INDENT_PADDING_X : SELECT_PANEL_PADDING_X;
        }
        // Invert the offset in LTR.
        if (!isRtl) {
            offsetX *= -1;
        }
        // Determine how much the select overflows on each side.
        const leftOverflow = 0 - (overlayRect.left + offsetX - (isRtl ? paddingWidth : 0));
        const rightOverflow = overlayRect.right + offsetX - viewportSize.width
            + (isRtl ? 0 : paddingWidth);
        // If the element overflows on either side, reduce the offset to allow it to fit.
        if (leftOverflow > 0) {
            offsetX += leftOverflow + SELECT_PANEL_VIEWPORT_PADDING;
        }
        else if (rightOverflow > 0) {
            offsetX -= rightOverflow + SELECT_PANEL_VIEWPORT_PADDING;
        }
        // Set the offset directly in order to avoid having to go through change detection and
        // potentially triggering "changed after it was checked" errors. Round the value to avoid
        // blurry content in some browsers.
        this._overlayDir.offsetX = Math.round(offsetX);
        this._overlayDir.overlayRef.updatePosition();
    }
    /**
     * Calculates the y-offset of the select's overlay panel in relation to the
     * top start corner of the trigger. It has to be adjusted in order for the
     * selected option to be aligned over the trigger when the panel opens.
     */
    _calculateOverlayOffsetY(selectedIndex, scrollBuffer, maxScroll) {
        const itemHeight = this._getItemHeight();
        const optionHeightAdjustment = (itemHeight - this._triggerRect.height) / 2;
        const maxOptionsDisplayed = Math.floor(SELECT_PANEL_MAX_HEIGHT / itemHeight);
        let optionOffsetFromPanelTop;
        // Disable offset if requested by user by returning 0 as value to offset
        if (this.disableOptionCentering) {
            return 0;
        }
        if (this._scrollTop === 0) {
            optionOffsetFromPanelTop = selectedIndex * itemHeight;
        }
        else if (this._scrollTop === maxScroll) {
            const firstDisplayedIndex = this._getItemCount() - maxOptionsDisplayed;
            const selectedDisplayIndex = selectedIndex - firstDisplayedIndex;
            // The first item is partially out of the viewport. Therefore we need to calculate what
            // portion of it is shown in the viewport and account for it in our offset.
            let partialItemHeight = itemHeight - (this._getItemCount() * itemHeight - SELECT_PANEL_MAX_HEIGHT) % itemHeight;
            // Because the panel height is longer than the height of the options alone,
            // there is always extra padding at the top or bottom of the panel. When
            // scrolled to the very bottom, this padding is at the top of the panel and
            // must be added to the offset.
            optionOffsetFromPanelTop = selectedDisplayIndex * itemHeight + partialItemHeight;
        }
        else {
            // If the option was scrolled to the middle of the panel using a scroll buffer,
            // its offset will be the scroll buffer minus the half height that was added to
            // center it.
            optionOffsetFromPanelTop = scrollBuffer - itemHeight / 2;
        }
        // The final offset is the option's offset from the top, adjusted for the height difference,
        // multiplied by -1 to ensure that the overlay moves in the correct direction up the page.
        // The value is rounded to prevent some browsers from blurring the content.
        return Math.round(optionOffsetFromPanelTop * -1 - optionHeightAdjustment);
    }
    /**
     * Checks that the attempted overlay position will fit within the viewport.
     * If it will not fit, tries to adjust the scroll position and the associated
     * y-offset so the panel can open fully on-screen. If it still won't fit,
     * sets the offset back to 0 to allow the fallback position to take over.
     */
    _checkOverlayWithinViewport(maxScroll) {
        const itemHeight = this._getItemHeight();
        const viewportSize = this._viewportRuler.getViewportSize();
        const topSpaceAvailable = this._triggerRect.top - SELECT_PANEL_VIEWPORT_PADDING;
        const bottomSpaceAvailable = viewportSize.height - this._triggerRect.bottom - SELECT_PANEL_VIEWPORT_PADDING;
        const panelHeightTop = Math.abs(this._offsetY);
        const totalPanelHeight = Math.min(this._getItemCount() * itemHeight, SELECT_PANEL_MAX_HEIGHT);
        const panelHeightBottom = totalPanelHeight - panelHeightTop - this._triggerRect.height;
        if (panelHeightBottom > bottomSpaceAvailable) {
            this._adjustPanelUp(panelHeightBottom, bottomSpaceAvailable);
        }
        else if (panelHeightTop > topSpaceAvailable) {
            this._adjustPanelDown(panelHeightTop, topSpaceAvailable, maxScroll);
        }
        else {
            this._transformOrigin = this._getOriginBasedOnOption();
        }
    }
    /** Adjusts the overlay panel up to fit in the viewport. */
    _adjustPanelUp(panelHeightBottom, bottomSpaceAvailable) {
        // Browsers ignore fractional scroll offsets, so we need to round.
        const distanceBelowViewport = Math.round(panelHeightBottom - bottomSpaceAvailable);
        // Scrolls the panel up by the distance it was extending past the boundary, then
        // adjusts the offset by that amount to move the panel up into the viewport.
        this._scrollTop -= distanceBelowViewport;
        this._offsetY -= distanceBelowViewport;
        this._transformOrigin = this._getOriginBasedOnOption();
        // If the panel is scrolled to the very top, it won't be able to fit the panel
        // by scrolling, so set the offset to 0 to allow the fallback position to take
        // effect.
        if (this._scrollTop <= 0) {
            this._scrollTop = 0;
            this._offsetY = 0;
            this._transformOrigin = `50% bottom 0px`;
        }
    }
    /** Adjusts the overlay panel down to fit in the viewport. */
    _adjustPanelDown(panelHeightTop, topSpaceAvailable, maxScroll) {
        // Browsers ignore fractional scroll offsets, so we need to round.
        const distanceAboveViewport = Math.round(panelHeightTop - topSpaceAvailable);
        // Scrolls the panel down by the distance it was extending past the boundary, then
        // adjusts the offset by that amount to move the panel down into the viewport.
        this._scrollTop += distanceAboveViewport;
        this._offsetY += distanceAboveViewport;
        this._transformOrigin = this._getOriginBasedOnOption();
        // If the panel is scrolled to the very bottom, it won't be able to fit the
        // panel by scrolling, so set the offset to 0 to allow the fallback position
        // to take effect.
        if (this._scrollTop >= maxScroll) {
            this._scrollTop = maxScroll;
            this._offsetY = 0;
            this._transformOrigin = `50% top 0px`;
            return;
        }
    }
    /** Calculates the scroll position and x- and y-offsets of the overlay panel. */
    _calculateOverlayPosition() {
        const itemHeight = this._getItemHeight();
        const items = this._getItemCount();
        const panelHeight = Math.min(items * itemHeight, SELECT_PANEL_MAX_HEIGHT);
        const scrollContainerHeight = items * itemHeight;
        // The farthest the panel can be scrolled before it hits the bottom
        const maxScroll = scrollContainerHeight - panelHeight;
        // If no value is selected we open the popup to the first item.
        let selectedOptionOffset;
        if (this.empty) {
            selectedOptionOffset = 0;
        }
        else {
            selectedOptionOffset =
                Math.max(this.options.toArray().indexOf(this._selectionModel.selected[0]), 0);
        }
        selectedOptionOffset += _countGroupLabelsBeforeOption(selectedOptionOffset, this.options, this.optionGroups);
        // We must maintain a scroll buffer so the selected option will be scrolled to the
        // center of the overlay panel rather than the top.
        const scrollBuffer = panelHeight / 2;
        this._scrollTop = this._calculateOverlayScroll(selectedOptionOffset, scrollBuffer, maxScroll);
        this._offsetY = this._calculateOverlayOffsetY(selectedOptionOffset, scrollBuffer, maxScroll);
        this._checkOverlayWithinViewport(maxScroll);
    }
    /** Sets the transform origin point based on the selected option. */
    _getOriginBasedOnOption() {
        const itemHeight = this._getItemHeight();
        const optionHeightAdjustment = (itemHeight - this._triggerRect.height) / 2;
        const originY = Math.abs(this._offsetY) - optionHeightAdjustment + itemHeight / 2;
        return `50% ${originY}px 0px`;
    }
    /** Calculates the height of the select's options. */
    _getItemHeight() {
        return this._triggerFontSize * SELECT_ITEM_HEIGHT_EM;
    }
    /** Calculates the amount of items in the select. This includes options and group labels. */
    _getItemCount() {
        return this.options.length + this.optionGroups.length;
    }
}
MatSelect.decorators = [
    { type: Component, args: [{
                selector: 'mat-select',
                exportAs: 'matSelect',
                template: "<!--\n Note that the select trigger element specifies `aria-owns` pointing to the listbox overlay.\n While aria-owns is not required for the ARIA 1.2 `role=\"combobox\"` interaction pattern,\n it fixes an issue with VoiceOver when the select appears inside of an `aria-model=\"true\"`\n element (e.g. a dialog). Without this `aria-owns`, the `aria-modal` on a dialog prevents\n VoiceOver from \"seeing\" the select's listbox overlay for aria-activedescendant.\n Using `aria-owns` re-parents the select overlay so that it works again.\n See https://github.com/angular/components/issues/20694\n-->\n<div cdk-overlay-origin\n     [attr.aria-owns]=\"panelOpen ? id + '-panel' : null\"\n     class=\"mat-select-trigger\"\n     (click)=\"toggle()\"\n     #origin=\"cdkOverlayOrigin\"\n     #trigger>\n  <div class=\"mat-select-value\" [ngSwitch]=\"empty\" [attr.id]=\"_valueId\">\n    <span class=\"mat-select-placeholder mat-select-min-line\" *ngSwitchCase=\"true\">{{placeholder}}</span>\n    <span class=\"mat-select-value-text\" *ngSwitchCase=\"false\" [ngSwitch]=\"!!customTrigger\">\n      <span class=\"mat-select-min-line\" *ngSwitchDefault>{{triggerValue}}</span>\n      <ng-content select=\"mat-select-trigger\" *ngSwitchCase=\"true\"></ng-content>\n    </span>\n  </div>\n\n  <div class=\"mat-select-arrow-wrapper\"><div class=\"mat-select-arrow\"></div></div>\n</div>\n\n<ng-template\n  cdk-connected-overlay\n  cdkConnectedOverlayLockPosition\n  cdkConnectedOverlayHasBackdrop\n  cdkConnectedOverlayBackdropClass=\"cdk-overlay-transparent-backdrop\"\n  [cdkConnectedOverlayPanelClass]=\"_overlayPanelClass\"\n  [cdkConnectedOverlayScrollStrategy]=\"_scrollStrategy\"\n  [cdkConnectedOverlayOrigin]=\"origin\"\n  [cdkConnectedOverlayOpen]=\"panelOpen\"\n  [cdkConnectedOverlayPositions]=\"_positions\"\n  [cdkConnectedOverlayMinWidth]=\"_triggerRect?.width!\"\n  [cdkConnectedOverlayOffsetY]=\"_offsetY\"\n  (backdropClick)=\"close()\"\n  (attach)=\"_onAttached()\"\n  (detach)=\"close()\">\n  <div class=\"mat-select-panel-wrap\" [@transformPanelWrap]>\n    <div\n      #panel\n      role=\"listbox\"\n      tabindex=\"-1\"\n      class=\"mat-select-panel {{ _getPanelTheme() }}\"\n      [attr.id]=\"id + '-panel'\"\n      [attr.aria-multiselectable]=\"multiple\"\n      [attr.aria-label]=\"ariaLabel || null\"\n      [attr.aria-labelledby]=\"_getPanelAriaLabelledby()\"\n      [ngClass]=\"panelClass\"\n      [@transformPanel]=\"multiple ? 'showing-multiple' : 'showing'\"\n      (@transformPanel.done)=\"_panelDoneAnimatingStream.next($event.toState)\"\n      [style.transformOrigin]=\"_transformOrigin\"\n      [style.font-size.px]=\"_triggerFontSize\"\n      (keydown)=\"_handleKeydown($event)\">\n      <ng-content></ng-content>\n    </div>\n  </div>\n</ng-template>\n",
                inputs: ['disabled', 'disableRipple', 'tabIndex'],
                encapsulation: ViewEncapsulation.None,
                changeDetection: ChangeDetectionStrategy.OnPush,
                host: {
                    'role': 'combobox',
                    'aria-autocomplete': 'none',
                    // TODO(crisbeto): the value for aria-haspopup should be `listbox`, but currently it's difficult
                    // to sync into Google, because of an outdated automated a11y check which flags it as an invalid
                    // value. At some point we should try to switch it back to being `listbox`.
                    'aria-haspopup': 'true',
                    'class': 'mat-select',
                    '[attr.id]': 'id',
                    '[attr.tabindex]': 'tabIndex',
                    '[attr.aria-controls]': 'panelOpen ? id + "-panel" : null',
                    '[attr.aria-expanded]': 'panelOpen',
                    '[attr.aria-label]': 'ariaLabel || null',
                    '[attr.aria-required]': 'required.toString()',
                    '[attr.aria-disabled]': 'disabled.toString()',
                    '[attr.aria-invalid]': 'errorState',
                    '[attr.aria-describedby]': '_ariaDescribedby || null',
                    '[attr.aria-activedescendant]': '_getAriaActiveDescendant()',
                    '[class.mat-select-disabled]': 'disabled',
                    '[class.mat-select-invalid]': 'errorState',
                    '[class.mat-select-required]': 'required',
                    '[class.mat-select-empty]': 'empty',
                    '[class.mat-select-multiple]': 'multiple',
                    '(keydown)': '_handleKeydown($event)',
                    '(focus)': '_onFocus()',
                    '(blur)': '_onBlur()',
                },
                animations: [
                    matSelectAnimations.transformPanelWrap,
                    matSelectAnimations.transformPanel
                ],
                providers: [
                    { provide: MatFormFieldControl, useExisting: MatSelect },
                    { provide: MAT_OPTION_PARENT_COMPONENT, useExisting: MatSelect }
                ],
                styles: [".mat-select{display:inline-block;width:100%;outline:none}.mat-select-trigger{display:inline-table;cursor:pointer;position:relative;box-sizing:border-box}.mat-select-disabled .mat-select-trigger{-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;cursor:default}.mat-select-value{display:table-cell;max-width:0;width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.mat-select-value-text{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.mat-select-arrow-wrapper{display:table-cell;vertical-align:middle}.mat-form-field-appearance-fill .mat-select-arrow-wrapper{transform:translateY(-50%)}.mat-form-field-appearance-outline .mat-select-arrow-wrapper{transform:translateY(-25%)}.mat-form-field-appearance-standard.mat-form-field-has-label .mat-select:not(.mat-select-empty) .mat-select-arrow-wrapper{transform:translateY(-50%)}.mat-form-field-appearance-standard .mat-select.mat-select-empty .mat-select-arrow-wrapper{transition:transform 400ms cubic-bezier(0.25, 0.8, 0.25, 1)}._mat-animation-noopable.mat-form-field-appearance-standard .mat-select.mat-select-empty .mat-select-arrow-wrapper{transition:none}.mat-select-arrow{width:0;height:0;border-left:5px solid transparent;border-right:5px solid transparent;border-top:5px solid;margin:0 4px}.mat-select-panel-wrap{flex-basis:100%}.mat-select-panel{min-width:112px;max-width:280px;overflow:auto;-webkit-overflow-scrolling:touch;padding-top:0;padding-bottom:0;max-height:256px;min-width:100%;border-radius:4px;outline:0}.cdk-high-contrast-active .mat-select-panel{outline:solid 1px}.mat-select-panel .mat-optgroup-label,.mat-select-panel .mat-option{font-size:inherit;line-height:3em;height:3em}.mat-form-field-type-mat-select:not(.mat-form-field-disabled) .mat-form-field-flex{cursor:pointer}.mat-form-field-type-mat-select .mat-form-field-label{width:calc(100% - 18px)}.mat-select-placeholder{transition:color 400ms 133.3333333333ms cubic-bezier(0.25, 0.8, 0.25, 1)}._mat-animation-noopable .mat-select-placeholder{transition:none}.mat-form-field-hide-placeholder .mat-select-placeholder{color:transparent;-webkit-text-fill-color:transparent;transition:none;display:block}.mat-select-min-line:empty::before{content:\" \";white-space:pre;width:1px;display:inline-block;opacity:0}\n"]
            },] }
];
MatSelect.propDecorators = {
    options: [{ type: ContentChildren, args: [MatOption, { descendants: true },] }],
    optionGroups: [{ type: ContentChildren, args: [MAT_OPTGROUP, { descendants: true },] }],
    customTrigger: [{ type: ContentChild, args: [MAT_SELECT_TRIGGER,] }]
};

/**
 * @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
 */
class MatSelectModule {
}
MatSelectModule.decorators = [
    { type: NgModule, args: [{
                imports: [
                    CommonModule,
                    OverlayModule,
                    MatOptionModule,
                    MatCommonModule,
                ],
                exports: [
                    CdkScrollableModule,
                    MatFormFieldModule,
                    MatSelect,
                    MatSelectTrigger,
                    MatOptionModule,
                    MatCommonModule
                ],
                declarations: [MatSelect, MatSelectTrigger],
                providers: [MAT_SELECT_SCROLL_STRATEGY_PROVIDER]
            },] }
];

/**
 * @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
 */

/**
 * Generated bundle index. Do not edit.
 */

export { MAT_SELECT_CONFIG, MAT_SELECT_SCROLL_STRATEGY, MAT_SELECT_SCROLL_STRATEGY_PROVIDER, MAT_SELECT_SCROLL_STRATEGY_PROVIDER_FACTORY, MAT_SELECT_TRIGGER, MatSelect, MatSelectChange, MatSelectModule, MatSelectTrigger, _MatSelectBase, matSelectAnimations };
//# sourceMappingURL=select.js.map