{"version":3,"file":"select.mjs","sources":["../../../../../../src/material/select/select-animations.ts","../../../../../../src/material/select/select-errors.ts","../../../../../../src/material/select/select.ts","../../../../../../src/material/select/select.html","../../../../../../src/material/select/select-module.ts","../../../../../../src/material/select/public-api.ts","../../../../../../src/material/select/index.ts"],"sourcesContent":["/**\n * @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 animate,\n animateChild,\n AnimationTriggerMetadata,\n query,\n state,\n style,\n transition,\n trigger,\n} from '@angular/animations';\n\n/**\n * The following are all the animations for the mat-select component, with each\n * const containing the metadata for one animation.\n *\n * The values below match the implementation of the AngularJS Material mat-select animation.\n * @docs-private\n */\nexport const matSelectAnimations: {\n readonly transformPanelWrap: AnimationTriggerMetadata;\n readonly transformPanel: AnimationTriggerMetadata;\n} = {\n /**\n * This animation ensures the select's overlay panel animation (transformPanel) is called when\n * closing the select.\n * This is needed due to https://github.com/angular/angular/issues/23302\n */\n transformPanelWrap: trigger('transformPanelWrap', [\n transition('* => void', query('@transformPanel', [animateChild()],\n {optional: true}))\n ]),\n\n /**\n * This animation transforms the select's overlay panel on and off the page.\n *\n * When the panel is attached to the DOM, it expands its width by the amount of padding, scales it\n * up to 100% on the Y axis, fades in its border, and translates slightly up and to the\n * side to ensure the option text correctly overlaps the trigger text.\n *\n * When the panel is removed from the DOM, it simply fades out linearly.\n */\n transformPanel: trigger('transformPanel', [\n state('void', style({\n transform: 'scaleY(0.8)',\n minWidth: '100%',\n opacity: 0\n })),\n state('showing', style({\n opacity: 1,\n minWidth: 'calc(100% + 32px)', // 32px = 2 * 16px padding\n transform: 'scaleY(1)'\n })),\n state('showing-multiple', style({\n opacity: 1,\n minWidth: 'calc(100% + 64px)', // 64px = 48px padding on the left + 16px padding on the right\n transform: 'scaleY(1)'\n })),\n transition('void => *', animate('120ms cubic-bezier(0, 0, 0.2, 1)')),\n transition('* => void', animate('100ms 25ms linear', style({opacity: 0})))\n ])\n};\n","/**\n * @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\n/**\n * Returns an exception to be thrown when attempting to change a select's `multiple` option\n * after initialization.\n * @docs-private\n */\nexport function getMatSelectDynamicMultipleError(): Error {\n return Error('Cannot change `multiple` mode of select after initialization.');\n}\n\n/**\n * Returns an exception to be thrown when attempting to assign a non-array value to a select\n * in `multiple` mode. Note that `undefined` and `null` are still valid values to allow for\n * resetting the value.\n * @docs-private\n */\nexport function getMatSelectNonArrayValueError(): Error {\n return Error('Value must be an array in multiple-selection mode.');\n}\n\n/**\n * Returns an exception to be thrown when assigning a non-function value to the comparator\n * used to determine if a value corresponds to an option. Note that whether the function\n * actually takes two values and returns a boolean is not checked.\n */\nexport function getMatSelectNonFunctionValueError(): Error {\n return Error('`compareWith` must be a function.');\n}\n","/**\n * @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 {ActiveDescendantKeyManager, LiveAnnouncer} from '@angular/cdk/a11y';\nimport {Directionality} from '@angular/cdk/bidi';\nimport {\n BooleanInput,\n coerceBooleanProperty,\n coerceNumberProperty,\n NumberInput\n} from '@angular/cdk/coercion';\nimport {SelectionModel} from '@angular/cdk/collections';\nimport {\n A,\n DOWN_ARROW,\n ENTER,\n hasModifierKey,\n LEFT_ARROW,\n RIGHT_ARROW,\n SPACE,\n UP_ARROW,\n} from '@angular/cdk/keycodes';\nimport {\n CdkConnectedOverlay,\n ConnectedPosition,\n Overlay,\n ScrollStrategy,\n} from '@angular/cdk/overlay';\nimport {ViewportRuler} from '@angular/cdk/scrolling';\nimport {\n AfterContentInit,\n Attribute,\n ChangeDetectionStrategy,\n ChangeDetectorRef,\n Component,\n ContentChild,\n ContentChildren,\n Directive,\n DoCheck,\n ElementRef,\n EventEmitter,\n Inject,\n InjectionToken,\n Input,\n NgZone,\n OnChanges,\n OnDestroy,\n OnInit,\n Optional,\n Output,\n QueryList,\n Self,\n SimpleChanges,\n ViewChild,\n ViewEncapsulation,\n} from '@angular/core';\nimport {\n ControlValueAccessor,\n FormGroupDirective,\n NgControl,\n NgForm,\n Validators,\n} from '@angular/forms';\nimport {\n _countGroupLabelsBeforeOption,\n _getOptionScrollPosition,\n CanDisable,\n CanDisableRipple,\n CanUpdateErrorState,\n ErrorStateMatcher,\n HasTabIndex,\n MAT_OPTGROUP,\n MAT_OPTION_PARENT_COMPONENT,\n MatOptgroup,\n MatOption,\n MatOptionSelectionChange,\n mixinDisabled,\n mixinDisableRipple,\n mixinErrorState,\n mixinTabIndex,\n _MatOptionBase,\n} from '@angular/material/core';\nimport {MAT_FORM_FIELD, MatFormField, MatFormFieldControl} from '@angular/material/form-field';\nimport {defer, merge, Observable, Subject} from 'rxjs';\nimport {\n distinctUntilChanged,\n filter,\n map,\n startWith,\n switchMap,\n take,\n takeUntil,\n} from 'rxjs/operators';\nimport {matSelectAnimations} from './select-animations';\nimport {\n getMatSelectDynamicMultipleError,\n getMatSelectNonArrayValueError,\n getMatSelectNonFunctionValueError,\n} from './select-errors';\n\n\nlet nextUniqueId = 0;\n\n/**\n * The following style constants are necessary to save here in order\n * to properly calculate the alignment of the selected option over\n * the trigger element.\n */\n\n/** The max height of the select's overlay panel. */\nexport const SELECT_PANEL_MAX_HEIGHT = 256;\n\n/** The panel's padding on the x-axis. */\nexport const SELECT_PANEL_PADDING_X = 16;\n\n/** The panel's x axis padding if it is indented (e.g. there is an option group). */\nexport const SELECT_PANEL_INDENT_PADDING_X = SELECT_PANEL_PADDING_X * 2;\n\n/** The height of the select items in `em` units. */\nexport const SELECT_ITEM_HEIGHT_EM = 3;\n\n// TODO(josephperrott): Revert to a constant after 2018 spec updates are fully merged.\n/**\n * Distance between the panel edge and the option text in\n * multi-selection mode.\n *\n * Calculated as:\n * (SELECT_PANEL_PADDING_X * 1.5) + 16 = 40\n * The padding is multiplied by 1.5 because the checkbox's margin is half the padding.\n * The checkbox width is 16px.\n */\nexport const SELECT_MULTIPLE_PANEL_PADDING_X = SELECT_PANEL_PADDING_X * 1.5 + 16;\n\n/**\n * The select panel will only \"fit\" inside the viewport if it is positioned at\n * this value or more away from the viewport boundary.\n */\nexport const SELECT_PANEL_VIEWPORT_PADDING = 8;\n\n/** Injection token that determines the scroll handling while a select is open. */\nexport const MAT_SELECT_SCROLL_STRATEGY =\n new InjectionToken<() => ScrollStrategy>('mat-select-scroll-strategy');\n\n/** @docs-private */\nexport function MAT_SELECT_SCROLL_STRATEGY_PROVIDER_FACTORY(overlay: Overlay):\n () => ScrollStrategy {\n return () => overlay.scrollStrategies.reposition();\n}\n\n/** Object that can be used to configure the default options for the select module. */\nexport interface MatSelectConfig {\n /** Whether option centering should be disabled. */\n disableOptionCentering?: boolean;\n\n /** Time to wait in milliseconds after the last keystroke before moving focus to an item. */\n typeaheadDebounceInterval?: number;\n\n /** Class or list of classes to be applied to the menu's overlay panel. */\n overlayPanelClass?: string | string[];\n}\n\n/** Injection token that can be used to provide the default options the select module. */\nexport const MAT_SELECT_CONFIG = new InjectionToken('MAT_SELECT_CONFIG');\n\n/** @docs-private */\nexport const MAT_SELECT_SCROLL_STRATEGY_PROVIDER = {\n provide: MAT_SELECT_SCROLL_STRATEGY,\n deps: [Overlay],\n useFactory: MAT_SELECT_SCROLL_STRATEGY_PROVIDER_FACTORY,\n};\n\n/** Change event object that is emitted when the select value has changed. */\nexport class MatSelectChange {\n constructor(\n /** Reference to the select that emitted the change event. */\n public source: MatSelect,\n /** Current value of the select that emitted the event. */\n public value: any) { }\n}\n\n// Boilerplate for applying mixins to MatSelect.\n/** @docs-private */\nconst _MatSelectMixinBase =\n mixinDisableRipple(mixinTabIndex(mixinDisabled(mixinErrorState(class {\n constructor(public _elementRef: ElementRef,\n public _defaultErrorStateMatcher: ErrorStateMatcher,\n public _parentForm: NgForm,\n public _parentFormGroup: FormGroupDirective,\n public ngControl: NgControl) {}\n }))));\n\n\n\n/**\n * Injection token that can be used to reference instances of `MatSelectTrigger`. It serves as\n * alternative token to the actual `MatSelectTrigger` class which could cause unnecessary\n * retention of the class and its directive metadata.\n */\nexport const MAT_SELECT_TRIGGER = new InjectionToken('MatSelectTrigger');\n\n/**\n * Allows the user to customize the trigger that is displayed when the select has a value.\n */\n@Directive({\n selector: 'mat-select-trigger',\n providers: [{provide: MAT_SELECT_TRIGGER, useExisting: MatSelectTrigger}],\n})\nexport class MatSelectTrigger {}\n\n/** Base class with all of the `MatSelect` functionality. */\n@Directive()\nexport abstract class _MatSelectBase extends _MatSelectMixinBase implements AfterContentInit,\n OnChanges, OnDestroy, OnInit, DoCheck, ControlValueAccessor, CanDisable, HasTabIndex,\n MatFormFieldControl, CanUpdateErrorState, CanDisableRipple {\n\n /** All of the defined select options. */\n abstract options: QueryList<_MatOptionBase>;\n\n // TODO(crisbeto): this is only necessary for the non-MDC select, but it's technically a\n // public API so we have to keep it. It should be deprecated and removed eventually.\n /** All of the defined groups of options. */\n abstract optionGroups: QueryList;\n\n /** User-supplied override of the trigger element. */\n abstract customTrigger: {};\n\n /**\n * This position config ensures that the top \"start\" corner of the overlay\n * is aligned with with the top \"start\" of the origin by default (overlapping\n * the trigger completely). If the panel cannot fit below the trigger, it\n * will fall back to a position above the trigger.\n */\n abstract _positions: ConnectedPosition[];\n\n /** Scrolls a particular option into the view. */\n protected abstract _scrollOptionIntoView(index: number): void;\n\n /** Called when the panel has been opened and the overlay has settled on its final position. */\n protected abstract _positioningSettled(): void;\n\n /** Creates a change event object that should be emitted by the select. */\n protected abstract _getChangeEvent(value: any): C;\n\n /** Factory function used to create a scroll strategy for this select. */\n private _scrollStrategyFactory: () => ScrollStrategy;\n\n /** Whether or not the overlay panel is open. */\n private _panelOpen = false;\n\n /** Comparison function to specify which option is displayed. Defaults to object equality. */\n private _compareWith = (o1: any, o2: any) => o1 === o2;\n\n /** Unique id for this input. */\n private _uid = `mat-select-${nextUniqueId++}`;\n\n /** Current `ariar-labelledby` value for the select trigger. */\n private _triggerAriaLabelledBy: string | null = null;\n\n /** Emits whenever the component is destroyed. */\n protected readonly _destroy = new Subject();\n\n /** The aria-describedby attribute on the select for improved a11y. */\n _ariaDescribedby: string;\n\n /** Deals with the selection logic. */\n _selectionModel: SelectionModel;\n\n /** Manages keyboard events for options in the panel. */\n _keyManager: ActiveDescendantKeyManager;\n\n /** `View -> model callback called when value changes` */\n _onChange: (value: any) => void = () => {};\n\n /** `View -> model callback called when select has been touched` */\n _onTouched = () => {};\n\n /** ID for the DOM node containing the select's value. */\n _valueId = `mat-select-value-${nextUniqueId++}`;\n\n /** Emits when the panel element is finished transforming in. */\n readonly _panelDoneAnimatingStream = new Subject();\n\n /** Strategy that will be used to handle scrolling while the select panel is open. */\n _scrollStrategy: ScrollStrategy;\n\n _overlayPanelClass: string | string[] = this._defaultOptions?.overlayPanelClass || '';\n\n /** Whether the select is focused. */\n get focused(): boolean {\n return this._focused || this._panelOpen;\n }\n private _focused = false;\n\n /** A name for this control that can be used by `mat-form-field`. */\n controlType = 'mat-select';\n\n /** Trigger that opens the select. */\n @ViewChild('trigger') trigger: ElementRef;\n\n /** Panel containing the select options. */\n @ViewChild('panel') panel: ElementRef;\n\n /** Overlay pane containing the options. */\n @ViewChild(CdkConnectedOverlay)\n protected _overlayDir: CdkConnectedOverlay;\n\n /** Classes to be passed to the select panel. Supports the same syntax as `ngClass`. */\n @Input() panelClass: string|string[]|Set|{[key: string]: any};\n\n /** Placeholder to be shown if no value has been selected. */\n @Input()\n get placeholder(): string { return this._placeholder; }\n set placeholder(value: string) {\n this._placeholder = value;\n this.stateChanges.next();\n }\n private _placeholder: string;\n\n /** Whether the component is required. */\n @Input()\n get required(): boolean {\n return this._required ?? this.ngControl?.control?.hasValidator(Validators.required) ?? false;\n }\n set required(value: boolean) {\n this._required = coerceBooleanProperty(value);\n this.stateChanges.next();\n }\n private _required: boolean | undefined;\n\n /** Whether the user should be allowed to select multiple options. */\n @Input()\n get multiple(): boolean { return this._multiple; }\n set multiple(value: boolean) {\n if (this._selectionModel && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n throw getMatSelectDynamicMultipleError();\n }\n\n this._multiple = coerceBooleanProperty(value);\n }\n private _multiple: boolean = false;\n\n /** Whether to center the active option over the trigger. */\n @Input()\n get disableOptionCentering(): boolean { return this._disableOptionCentering; }\n set disableOptionCentering(value: boolean) {\n this._disableOptionCentering = coerceBooleanProperty(value);\n }\n private _disableOptionCentering = this._defaultOptions?.disableOptionCentering ?? false;\n\n /**\n * Function to compare the option values with the selected values. The first argument\n * is a value from an option. The second is a value from the selection. A boolean\n * should be returned.\n */\n @Input()\n get compareWith() { return this._compareWith; }\n set compareWith(fn: (o1: any, o2: any) => boolean) {\n if (typeof fn !== 'function' && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n throw getMatSelectNonFunctionValueError();\n }\n this._compareWith = fn;\n if (this._selectionModel) {\n // A different comparator means the selection could change.\n this._initializeSelection();\n }\n }\n\n /** Value of the select control. */\n @Input()\n get value(): any { return this._value; }\n set value(newValue: any) {\n // Always re-assign an array, because it might have been mutated.\n if (newValue !== this._value || (this._multiple && Array.isArray(newValue))) {\n if (this.options) {\n this._setSelectionByValue(newValue);\n }\n\n this._value = newValue;\n }\n }\n private _value: any;\n\n /** Aria label of the select. */\n @Input('aria-label') ariaLabel: string = '';\n\n /** Input that can be used to specify the `aria-labelledby` attribute. */\n @Input('aria-labelledby') ariaLabelledby: string;\n\n /** Object used to control when error messages are shown. */\n @Input() override errorStateMatcher: ErrorStateMatcher;\n\n /** Time to wait in milliseconds after the last keystroke before moving focus to an item. */\n @Input()\n get typeaheadDebounceInterval(): number { return this._typeaheadDebounceInterval; }\n set typeaheadDebounceInterval(value: number) {\n this._typeaheadDebounceInterval = coerceNumberProperty(value);\n }\n private _typeaheadDebounceInterval: number;\n\n /**\n * Function used to sort the values in a select in multiple mode.\n * Follows the same logic as `Array.prototype.sort`.\n */\n @Input() sortComparator: (a: MatOption, b: MatOption, options: MatOption[]) => number;\n\n /** Unique id of the element. */\n @Input()\n get id(): string { return this._id; }\n set id(value: string) {\n this._id = value || this._uid;\n this.stateChanges.next();\n }\n private _id: string;\n\n /** Combined stream of all of the child options' change events. */\n readonly optionSelectionChanges: Observable = defer(() => {\n const options = this.options;\n\n if (options) {\n return options.changes.pipe(\n startWith(options),\n switchMap(() => merge(...options.map(option => option.onSelectionChange)))\n );\n }\n\n return this._ngZone.onStable\n .pipe(take(1), switchMap(() => this.optionSelectionChanges));\n }) as Observable;\n\n /** Event emitted when the select panel has been toggled. */\n @Output() readonly openedChange: EventEmitter = new EventEmitter();\n\n /** Event emitted when the select has been opened. */\n @Output('opened') readonly _openedStream: Observable =\n this.openedChange.pipe(filter(o => o), map(() => {}));\n\n /** Event emitted when the select has been closed. */\n @Output('closed') readonly _closedStream: Observable =\n this.openedChange.pipe(filter(o => !o), map(() => {}));\n\n /** Event emitted when the selected value has been changed by the user. */\n @Output() readonly selectionChange: EventEmitter = new EventEmitter();\n\n /**\n * Event that emits whenever the raw value of the select changes. This is here primarily\n * to facilitate the two-way binding for the `value` input.\n * @docs-private\n */\n @Output() readonly valueChange: EventEmitter = new EventEmitter();\n\n constructor(\n protected _viewportRuler: ViewportRuler,\n protected _changeDetectorRef: ChangeDetectorRef,\n protected _ngZone: NgZone,\n _defaultErrorStateMatcher: ErrorStateMatcher,\n elementRef: ElementRef,\n @Optional() private _dir: Directionality,\n @Optional() _parentForm: NgForm,\n @Optional() _parentFormGroup: FormGroupDirective,\n @Optional() @Inject(MAT_FORM_FIELD) protected _parentFormField: MatFormField,\n @Self() @Optional() ngControl: NgControl,\n @Attribute('tabindex') tabIndex: string,\n @Inject(MAT_SELECT_SCROLL_STRATEGY) scrollStrategyFactory: any,\n private _liveAnnouncer: LiveAnnouncer,\n @Optional() @Inject(MAT_SELECT_CONFIG) private _defaultOptions?: MatSelectConfig) {\n super(elementRef, _defaultErrorStateMatcher, _parentForm,\n _parentFormGroup, ngControl);\n\n if (this.ngControl) {\n // Note: we provide the value accessor through here, instead of\n // the `providers` to avoid running into a circular import.\n this.ngControl.valueAccessor = this;\n }\n\n // Note that we only want to set this when the defaults pass it in, otherwise it should\n // stay as `undefined` so that it falls back to the default in the key manager.\n if (_defaultOptions?.typeaheadDebounceInterval != null) {\n this._typeaheadDebounceInterval = _defaultOptions.typeaheadDebounceInterval;\n }\n\n this._scrollStrategyFactory = scrollStrategyFactory;\n this._scrollStrategy = this._scrollStrategyFactory();\n this.tabIndex = parseInt(tabIndex) || 0;\n\n // Force setter to be called in case id was not specified.\n this.id = this.id;\n }\n\n ngOnInit() {\n this._selectionModel = new SelectionModel(this.multiple);\n this.stateChanges.next();\n\n // We need `distinctUntilChanged` here, because some browsers will\n // fire the animation end event twice for the same animation. See:\n // https://github.com/angular/angular/issues/24084\n this._panelDoneAnimatingStream\n .pipe(distinctUntilChanged(), takeUntil(this._destroy))\n .subscribe(() => this._panelDoneAnimating(this.panelOpen));\n }\n\n ngAfterContentInit() {\n this._initKeyManager();\n\n this._selectionModel.changed.pipe(takeUntil(this._destroy)).subscribe(event => {\n event.added.forEach(option => option.select());\n event.removed.forEach(option => option.deselect());\n });\n\n this.options.changes.pipe(startWith(null), takeUntil(this._destroy)).subscribe(() => {\n this._resetOptions();\n this._initializeSelection();\n });\n }\n\n ngDoCheck() {\n const newAriaLabelledby = this._getTriggerAriaLabelledby();\n\n // We have to manage setting the `aria-labelledby` ourselves, because part of its value\n // is computed as a result of a content query which can cause this binding to trigger a\n // \"changed after checked\" error.\n if (newAriaLabelledby !== this._triggerAriaLabelledBy) {\n const element: HTMLElement = this._elementRef.nativeElement;\n this._triggerAriaLabelledBy = newAriaLabelledby;\n if (newAriaLabelledby) {\n element.setAttribute('aria-labelledby', newAriaLabelledby);\n } else {\n element.removeAttribute('aria-labelledby');\n }\n }\n\n if (this.ngControl) {\n this.updateErrorState();\n }\n }\n\n ngOnChanges(changes: SimpleChanges) {\n // Updating the disabled state is handled by `mixinDisabled`, but we need to additionally let\n // the parent form field know to run change detection when the disabled state changes.\n if (changes['disabled']) {\n this.stateChanges.next();\n }\n\n if (changes['typeaheadDebounceInterval'] && this._keyManager) {\n this._keyManager.withTypeAhead(this._typeaheadDebounceInterval);\n }\n }\n\n ngOnDestroy() {\n this._destroy.next();\n this._destroy.complete();\n this.stateChanges.complete();\n }\n\n /** Toggles the overlay panel open or closed. */\n toggle(): void {\n this.panelOpen ? this.close() : this.open();\n }\n\n /** Opens the overlay panel. */\n open(): void {\n if (this._canOpen()) {\n this._panelOpen = true;\n this._keyManager.withHorizontalOrientation(null);\n this._highlightCorrectOption();\n this._changeDetectorRef.markForCheck();\n }\n }\n\n /** Closes the overlay panel and focuses the host element. */\n close(): void {\n if (this._panelOpen) {\n this._panelOpen = false;\n this._keyManager.withHorizontalOrientation(this._isRtl() ? 'rtl' : 'ltr');\n this._changeDetectorRef.markForCheck();\n this._onTouched();\n }\n }\n\n /**\n * Sets the select's value. Part of the ControlValueAccessor interface\n * required to integrate with Angular's core forms API.\n *\n * @param value New value to be written to the model.\n */\n writeValue(value: any): void {\n this.value = value;\n }\n\n /**\n * Saves a callback function to be invoked when the select's value\n * changes from user input. Part of the ControlValueAccessor interface\n * required to integrate with Angular's core forms API.\n *\n * @param fn Callback to be triggered when the value changes.\n */\n registerOnChange(fn: (value: any) => void): void {\n this._onChange = fn;\n }\n\n /**\n * Saves a callback function to be invoked when the select is blurred\n * by the user. Part of the ControlValueAccessor interface required\n * to integrate with Angular's core forms API.\n *\n * @param fn Callback to be triggered when the component has been touched.\n */\n registerOnTouched(fn: () => {}): void {\n this._onTouched = fn;\n }\n\n /**\n * Disables the select. Part of the ControlValueAccessor interface required\n * to integrate with Angular's core forms API.\n *\n * @param isDisabled Sets whether the component is disabled.\n */\n setDisabledState(isDisabled: boolean): void {\n this.disabled = isDisabled;\n this._changeDetectorRef.markForCheck();\n this.stateChanges.next();\n }\n\n /** Whether or not the overlay panel is open. */\n get panelOpen(): boolean {\n return this._panelOpen;\n }\n\n /** The currently selected option. */\n get selected(): MatOption | MatOption[] {\n return this.multiple ? (this._selectionModel?.selected || []) :\n this._selectionModel?.selected[0];\n }\n\n /** The value displayed in the trigger. */\n get triggerValue(): string {\n if (this.empty) {\n return '';\n }\n\n if (this._multiple) {\n const selectedOptions = this._selectionModel.selected.map(option => option.viewValue);\n\n if (this._isRtl()) {\n selectedOptions.reverse();\n }\n\n // TODO(crisbeto): delimiter should be configurable for proper localization.\n return selectedOptions.join(', ');\n }\n\n return this._selectionModel.selected[0].viewValue;\n }\n\n /** Whether the element is in RTL mode. */\n _isRtl(): boolean {\n return this._dir ? this._dir.value === 'rtl' : false;\n }\n\n /** Handles all keydown events on the select. */\n _handleKeydown(event: KeyboardEvent): void {\n if (!this.disabled) {\n this.panelOpen ? this._handleOpenKeydown(event) : this._handleClosedKeydown(event);\n }\n }\n\n /** Handles keyboard events while the select is closed. */\n private _handleClosedKeydown(event: KeyboardEvent): void {\n const keyCode = event.keyCode;\n const isArrowKey = keyCode === DOWN_ARROW || keyCode === UP_ARROW ||\n keyCode === LEFT_ARROW || keyCode === RIGHT_ARROW;\n const isOpenKey = keyCode === ENTER || keyCode === SPACE;\n const manager = this._keyManager;\n\n // Open the select on ALT + arrow key to match the native \n event.preventDefault();\n this.close();\n // Don't do anything in this case if the user is typing,\n // because the typing sequence can include the space key.\n } else if (!isTyping && (keyCode === ENTER || keyCode === SPACE) && manager.activeItem &&\n !hasModifierKey(event)) {\n event.preventDefault();\n manager.activeItem._selectViaInteraction();\n } else if (!isTyping && this._multiple && keyCode === A && event.ctrlKey) {\n event.preventDefault();\n const hasDeselectedOptions = this.options.some(opt => !opt.disabled && !opt.selected);\n\n this.options.forEach(option => {\n if (!option.disabled) {\n hasDeselectedOptions ? option.select() : option.deselect();\n }\n });\n } else {\n const previouslyFocusedIndex = manager.activeItemIndex;\n\n manager.onKeydown(event);\n\n if (this._multiple && isArrowKey && event.shiftKey && manager.activeItem &&\n manager.activeItemIndex !== previouslyFocusedIndex) {\n manager.activeItem._selectViaInteraction();\n }\n }\n }\n\n _onFocus() {\n if (!this.disabled) {\n this._focused = true;\n this.stateChanges.next();\n }\n }\n\n /**\n * Calls the touched callback only if the panel is closed. Otherwise, the trigger will\n * \"blur\" to the panel when it opens, causing a false positive.\n */\n _onBlur() {\n this._focused = false;\n\n if (!this.disabled && !this.panelOpen) {\n this._onTouched();\n this._changeDetectorRef.markForCheck();\n this.stateChanges.next();\n }\n }\n\n /**\n * Callback that is invoked when the overlay panel has been attached.\n */\n _onAttached(): void {\n this._overlayDir.positionChange.pipe(take(1)).subscribe(() => {\n this._changeDetectorRef.detectChanges();\n this._positioningSettled();\n });\n }\n\n /** Returns the theme to be used on the panel. */\n _getPanelTheme(): string {\n return this._parentFormField ? `mat-${this._parentFormField.color}` : '';\n }\n\n /** Whether the select has a value. */\n get empty(): boolean {\n return !this._selectionModel || this._selectionModel.isEmpty();\n }\n\n private _initializeSelection(): void {\n // Defer setting the value in order to avoid the \"Expression\n // has changed after it was checked\" errors from Angular.\n Promise.resolve().then(() => {\n this._setSelectionByValue(this.ngControl ? this.ngControl.value : this._value);\n this.stateChanges.next();\n });\n }\n\n /**\n * Sets the selected option based on a value. If no option can be\n * found with the designated value, the select trigger is cleared.\n */\n private _setSelectionByValue(value: any | any[]): void {\n this._selectionModel.selected.forEach(option => option.setInactiveStyles());\n this._selectionModel.clear();\n\n if (this.multiple && value) {\n if (!Array.isArray(value) && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n throw getMatSelectNonArrayValueError();\n }\n\n value.forEach((currentValue: any) => this._selectValue(currentValue));\n this._sortValues();\n } else {\n const correspondingOption = this._selectValue(value);\n\n // Shift focus to the active item. Note that we shouldn't do this in multiple\n // mode, because we don't know what option the user interacted with last.\n if (correspondingOption) {\n this._keyManager.updateActiveItem(correspondingOption);\n } else if (!this.panelOpen) {\n // Otherwise reset the highlighted option. Note that we only want to do this while\n // closed, because doing it while open can shift the user's focus unnecessarily.\n this._keyManager.updateActiveItem(-1);\n }\n }\n\n this._changeDetectorRef.markForCheck();\n }\n\n /**\n * Finds and selects and option based on its value.\n * @returns Option that has the corresponding value.\n */\n private _selectValue(value: any): MatOption | undefined {\n const correspondingOption = this.options.find((option: MatOption) => {\n // Skip options that are already in the model. This allows us to handle cases\n // where the same primitive value is selected multiple times.\n if (this._selectionModel.isSelected(option)) {\n return false;\n }\n\n try {\n // Treat null as a special reset value.\n return option.value != null && this._compareWith(option.value, value);\n } catch (error) {\n if (typeof ngDevMode === 'undefined' || ngDevMode) {\n // Notify developers of errors in their comparator.\n console.warn(error);\n }\n return false;\n }\n });\n\n if (correspondingOption) {\n this._selectionModel.select(correspondingOption);\n }\n\n return correspondingOption;\n }\n\n /** Sets up a key manager to listen to keyboard events on the overlay panel. */\n private _initKeyManager() {\n this._keyManager = new ActiveDescendantKeyManager(this.options)\n .withTypeAhead(this._typeaheadDebounceInterval)\n .withVerticalOrientation()\n .withHorizontalOrientation(this._isRtl() ? 'rtl' : 'ltr')\n .withHomeAndEnd()\n .withAllowedModifierKeys(['shiftKey']);\n\n this._keyManager.tabOut.pipe(takeUntil(this._destroy)).subscribe(() => {\n if (this.panelOpen) {\n // Select the active item when tabbing away. This is consistent with how the native\n // select behaves. Note that we only want to do this in single selection mode.\n if (!this.multiple && this._keyManager.activeItem) {\n this._keyManager.activeItem._selectViaInteraction();\n }\n\n // Restore focus to the trigger before closing. Ensures that the focus\n // position won't be lost if the user got focus into the overlay.\n this.focus();\n this.close();\n }\n });\n\n this._keyManager.change.pipe(takeUntil(this._destroy)).subscribe(() => {\n if (this._panelOpen && this.panel) {\n this._scrollOptionIntoView(this._keyManager.activeItemIndex || 0);\n } else if (!this._panelOpen && !this.multiple && this._keyManager.activeItem) {\n this._keyManager.activeItem._selectViaInteraction();\n }\n });\n }\n\n /** Drops current option subscriptions and IDs and resets from scratch. */\n private _resetOptions(): void {\n const changedOrDestroyed = merge(this.options.changes, this._destroy);\n\n this.optionSelectionChanges.pipe(takeUntil(changedOrDestroyed)).subscribe(event => {\n this._onSelect(event.source, event.isUserInput);\n\n if (event.isUserInput && !this.multiple && this._panelOpen) {\n this.close();\n this.focus();\n }\n });\n\n // Listen to changes in the internal state of the options and react accordingly.\n // Handles cases like the labels of the selected options changing.\n merge(...this.options.map(option => option._stateChanges))\n .pipe(takeUntil(changedOrDestroyed))\n .subscribe(() => {\n this._changeDetectorRef.markForCheck();\n this.stateChanges.next();\n });\n }\n\n /** Invoked when an option is clicked. */\n private _onSelect(option: MatOption, isUserInput: boolean): void {\n const wasSelected = this._selectionModel.isSelected(option);\n\n if (option.value == null && !this._multiple) {\n option.deselect();\n this._selectionModel.clear();\n\n if (this.value != null) {\n this._propagateChanges(option.value);\n }\n } else {\n if (wasSelected !== option.selected) {\n option.selected ? this._selectionModel.select(option) :\n this._selectionModel.deselect(option);\n }\n\n if (isUserInput) {\n this._keyManager.setActiveItem(option);\n }\n\n if (this.multiple) {\n this._sortValues();\n\n if (isUserInput) {\n // In case the user selected the option with their mouse, we\n // want to restore focus back to the trigger, in order to\n // prevent the select keyboard controls from clashing with\n // the ones from `mat-option`.\n this.focus();\n }\n }\n }\n\n if (wasSelected !== this._selectionModel.isSelected(option)) {\n this._propagateChanges();\n }\n\n this.stateChanges.next();\n }\n\n /** Sorts the selected values in the selected based on their order in the panel. */\n private _sortValues() {\n if (this.multiple) {\n const options = this.options.toArray();\n\n this._selectionModel.sort((a, b) => {\n return this.sortComparator ? this.sortComparator(a, b, options) :\n options.indexOf(a) - options.indexOf(b);\n });\n this.stateChanges.next();\n }\n }\n\n /** Emits change event to set the model value. */\n private _propagateChanges(fallbackValue?: any): void {\n let valueToEmit: any = null;\n\n if (this.multiple) {\n valueToEmit = (this.selected as MatOption[]).map(option => option.value);\n } else {\n valueToEmit = this.selected ? (this.selected as MatOption).value : fallbackValue;\n }\n\n this._value = valueToEmit;\n this.valueChange.emit(valueToEmit);\n this._onChange(valueToEmit);\n this.selectionChange.emit(this._getChangeEvent(valueToEmit));\n this._changeDetectorRef.markForCheck();\n }\n\n /**\n * Highlights the selected item. If no option is selected, it will highlight\n * the first item instead.\n */\n private _highlightCorrectOption(): void {\n if (this._keyManager) {\n if (this.empty) {\n this._keyManager.setFirstItemActive();\n } else {\n this._keyManager.setActiveItem(this._selectionModel.selected[0]);\n }\n }\n }\n\n /** Whether the panel is allowed to open. */\n protected _canOpen(): boolean {\n return !this._panelOpen && !this.disabled && this.options?.length > 0;\n }\n\n /** Focuses the select element. */\n focus(options?: FocusOptions): void {\n this._elementRef.nativeElement.focus(options);\n }\n\n /** Gets the aria-labelledby for the select panel. */\n _getPanelAriaLabelledby(): string | null {\n if (this.ariaLabel) {\n return null;\n }\n\n const labelId = this._parentFormField?.getLabelId();\n const labelExpression = (labelId ? labelId + ' ' : '');\n return this.ariaLabelledby ? labelExpression + this.ariaLabelledby : labelId;\n }\n\n /** Determines the `aria-activedescendant` to be set on the host. */\n _getAriaActiveDescendant(): string | null {\n if (this.panelOpen && this._keyManager && this._keyManager.activeItem) {\n return this._keyManager.activeItem.id;\n }\n\n return null;\n }\n\n /** Gets the aria-labelledby of the select component trigger. */\n private _getTriggerAriaLabelledby(): string | null {\n if (this.ariaLabel) {\n return null;\n }\n\n const labelId = this._parentFormField?.getLabelId();\n let value = (labelId ? labelId + ' ' : '') + this._valueId;\n\n if (this.ariaLabelledby) {\n value += ' ' + this.ariaLabelledby;\n }\n\n return value;\n }\n\n /** Called when the overlay panel is done animating. */\n protected _panelDoneAnimating(isOpen: boolean) {\n this.openedChange.emit(isOpen);\n }\n\n /**\n * Implemented as part of MatFormFieldControl.\n * @docs-private\n */\n setDescribedByIds(ids: string[]) {\n this._ariaDescribedby = ids.join(' ');\n }\n\n /**\n * Implemented as part of MatFormFieldControl.\n * @docs-private\n */\n onContainerClick() {\n this.focus();\n this.open();\n }\n\n /**\n * Implemented as part of MatFormFieldControl.\n * @docs-private\n */\n get shouldLabelFloat(): boolean {\n return this._panelOpen || !this.empty || (this._focused && !!this._placeholder);\n }\n\n static ngAcceptInputType_required: BooleanInput;\n static ngAcceptInputType_multiple: BooleanInput;\n static ngAcceptInputType_disableOptionCentering: BooleanInput;\n static ngAcceptInputType_typeaheadDebounceInterval: NumberInput;\n static ngAcceptInputType_disabled: BooleanInput;\n static ngAcceptInputType_disableRipple: BooleanInput;\n static ngAcceptInputType_tabIndex: NumberInput;\n}\n\n@Component({\n selector: 'mat-select',\n exportAs: 'matSelect',\n templateUrl: 'select.html',\n styleUrls: ['select.css'],\n inputs: ['disabled', 'disableRipple', 'tabIndex'],\n encapsulation: ViewEncapsulation.None,\n changeDetection: ChangeDetectionStrategy.OnPush,\n host: {\n 'role': 'combobox',\n 'aria-autocomplete': 'none',\n // TODO(crisbeto): the value for aria-haspopup should be `listbox`, but currently it's difficult\n // to sync into Google, because of an outdated automated a11y check which flags it as an invalid\n // value. At some point we should try to switch it back to being `listbox`.\n 'aria-haspopup': 'true',\n 'class': 'mat-select',\n '[attr.id]': 'id',\n '[attr.tabindex]': 'tabIndex',\n '[attr.aria-controls]': 'panelOpen ? id + \"-panel\" : null',\n '[attr.aria-expanded]': 'panelOpen',\n '[attr.aria-label]': 'ariaLabel || null',\n '[attr.aria-required]': 'required.toString()',\n '[attr.aria-disabled]': 'disabled.toString()',\n '[attr.aria-invalid]': 'errorState',\n '[attr.aria-describedby]': '_ariaDescribedby || null',\n '[attr.aria-activedescendant]': '_getAriaActiveDescendant()',\n '[class.mat-select-disabled]': 'disabled',\n '[class.mat-select-invalid]': 'errorState',\n '[class.mat-select-required]': 'required',\n '[class.mat-select-empty]': 'empty',\n '[class.mat-select-multiple]': 'multiple',\n '(keydown)': '_handleKeydown($event)',\n '(focus)': '_onFocus()',\n '(blur)': '_onBlur()',\n },\n animations: [\n matSelectAnimations.transformPanelWrap,\n matSelectAnimations.transformPanel\n ],\n providers: [\n {provide: MatFormFieldControl, useExisting: MatSelect},\n {provide: MAT_OPTION_PARENT_COMPONENT, useExisting: MatSelect}\n ],\n})\nexport class MatSelect extends _MatSelectBase implements OnInit {\n /** The scroll position of the overlay panel, calculated to center the selected option. */\n private _scrollTop = 0;\n\n /** The last measured value for the trigger's client bounding rect. */\n _triggerRect: ClientRect;\n\n /** The cached font-size of the trigger element. */\n _triggerFontSize = 0;\n\n /** The value of the select panel's transform-origin property. */\n _transformOrigin: string = 'top';\n\n /**\n * The y-offset of the overlay panel in relation to the trigger's top start corner.\n * This must be adjusted to align the selected option text over the trigger text.\n * when the panel opens. Will change based on the y-position of the selected option.\n */\n _offsetY = 0;\n\n @ContentChildren(MatOption, {descendants: true}) options: QueryList;\n\n @ContentChildren(MAT_OPTGROUP, {descendants: true}) optionGroups: QueryList;\n\n @ContentChild(MAT_SELECT_TRIGGER) customTrigger: MatSelectTrigger;\n\n _positions: ConnectedPosition[] = [\n {\n originX: 'start',\n originY: 'top',\n overlayX: 'start',\n overlayY: 'top',\n },\n {\n originX: 'start',\n originY: 'bottom',\n overlayX: 'start',\n overlayY: 'bottom',\n },\n ];\n\n /**\n * Calculates the scroll position of the select's overlay panel.\n *\n * Attempts to center the selected option in the panel. If the option is\n * too high or too low in the panel to be scrolled to the center, it clamps the\n * scroll position to the min or max scroll positions respectively.\n */\n _calculateOverlayScroll(selectedIndex: number, scrollBuffer: number,\n maxScroll: number): number {\n const itemHeight = this._getItemHeight();\n const optionOffsetFromScrollTop = itemHeight * selectedIndex;\n const halfOptionHeight = itemHeight / 2;\n\n // Starts at the optionOffsetFromScrollTop, which scrolls the option to the top of the\n // scroll container, then subtracts the scroll buffer to scroll the option down to\n // the center of the overlay panel. Half the option height must be re-added to the\n // scrollTop so the option is centered based on its middle, not its top edge.\n const optimalScrollPosition = optionOffsetFromScrollTop - scrollBuffer + halfOptionHeight;\n return Math.min(Math.max(0, optimalScrollPosition), maxScroll);\n }\n\n override ngOnInit() {\n super.ngOnInit();\n this._viewportRuler.change().pipe(takeUntil(this._destroy)).subscribe(() => {\n if (this.panelOpen) {\n this._triggerRect = this.trigger.nativeElement.getBoundingClientRect();\n this._changeDetectorRef.markForCheck();\n }\n });\n }\n\n override open(): void {\n if (super._canOpen()) {\n super.open();\n this._triggerRect = this.trigger.nativeElement.getBoundingClientRect();\n // Note: The computed font-size will be a string pixel value (e.g. \"16px\").\n // `parseInt` ignores the trailing 'px' and converts this to a number.\n this._triggerFontSize =\n parseInt(getComputedStyle(this.trigger.nativeElement).fontSize || '0');\n this._calculateOverlayPosition();\n\n // Set the font size on the panel element once it exists.\n this._ngZone.onStable.pipe(take(1)).subscribe(() => {\n if (this._triggerFontSize && this._overlayDir.overlayRef &&\n this._overlayDir.overlayRef.overlayElement) {\n this._overlayDir.overlayRef.overlayElement.style.fontSize = `${this._triggerFontSize}px`;\n }\n });\n }\n }\n\n /** Scrolls the active option into view. */\n protected _scrollOptionIntoView(index: number): void {\n const labelCount = _countGroupLabelsBeforeOption(index, this.options, this.optionGroups);\n const itemHeight = this._getItemHeight();\n\n if (index === 0 && labelCount === 1) {\n // If we've got one group label before the option and we're at the top option,\n // scroll the list to the top. This is better UX than scrolling the list to the\n // top of the option, because it allows the user to read the top group's label.\n this.panel.nativeElement.scrollTop = 0;\n } else {\n this.panel.nativeElement.scrollTop = _getOptionScrollPosition(\n (index + labelCount) * itemHeight,\n itemHeight,\n this.panel.nativeElement.scrollTop,\n SELECT_PANEL_MAX_HEIGHT\n );\n }\n }\n\n protected _positioningSettled() {\n this._calculateOverlayOffsetX();\n this.panel.nativeElement.scrollTop = this._scrollTop;\n }\n\n protected override _panelDoneAnimating(isOpen: boolean) {\n if (this.panelOpen) {\n this._scrollTop = 0;\n } else {\n this._overlayDir.offsetX = 0;\n this._changeDetectorRef.markForCheck();\n }\n\n super._panelDoneAnimating(isOpen);\n }\n\n protected _getChangeEvent(value: any) {\n return new MatSelectChange(this, value);\n }\n\n /**\n * Sets the x-offset of the overlay panel in relation to the trigger's top start corner.\n * This must be adjusted to align the selected option text over the trigger text when\n * the panel opens. Will change based on LTR or RTL text direction. Note that the offset\n * can't be calculated until the panel has been attached, because we need to know the\n * content width in order to constrain the panel within the viewport.\n */\n private _calculateOverlayOffsetX(): void {\n const overlayRect = this._overlayDir.overlayRef.overlayElement.getBoundingClientRect();\n const viewportSize = this._viewportRuler.getViewportSize();\n const isRtl = this._isRtl();\n const paddingWidth = this.multiple ? SELECT_MULTIPLE_PANEL_PADDING_X + SELECT_PANEL_PADDING_X :\n SELECT_PANEL_PADDING_X * 2;\n let offsetX: number;\n\n // Adjust the offset, depending on the option padding.\n if (this.multiple) {\n offsetX = SELECT_MULTIPLE_PANEL_PADDING_X;\n } else if (this.disableOptionCentering) {\n offsetX = SELECT_PANEL_PADDING_X;\n } else {\n let selected = this._selectionModel.selected[0] || this.options.first;\n offsetX = selected && selected.group ? SELECT_PANEL_INDENT_PADDING_X : SELECT_PANEL_PADDING_X;\n }\n\n // Invert the offset in LTR.\n if (!isRtl) {\n offsetX *= -1;\n }\n\n // Determine how much the select overflows on each side.\n const leftOverflow = 0 - (overlayRect.left + offsetX - (isRtl ? paddingWidth : 0));\n const rightOverflow = overlayRect.right + offsetX - viewportSize.width\n + (isRtl ? 0 : paddingWidth);\n\n // If the element overflows on either side, reduce the offset to allow it to fit.\n if (leftOverflow > 0) {\n offsetX += leftOverflow + SELECT_PANEL_VIEWPORT_PADDING;\n } else if (rightOverflow > 0) {\n offsetX -= rightOverflow + SELECT_PANEL_VIEWPORT_PADDING;\n }\n\n // Set the offset directly in order to avoid having to go through change detection and\n // potentially triggering \"changed after it was checked\" errors. Round the value to avoid\n // blurry content in some browsers.\n this._overlayDir.offsetX = Math.round(offsetX);\n this._overlayDir.overlayRef.updatePosition();\n }\n\n /**\n * Calculates the y-offset of the select's overlay panel in relation to the\n * top start corner of the trigger. It has to be adjusted in order for the\n * selected option to be aligned over the trigger when the panel opens.\n */\n private _calculateOverlayOffsetY(selectedIndex: number, scrollBuffer: number,\n maxScroll: number): number {\n const itemHeight = this._getItemHeight();\n const optionHeightAdjustment = (itemHeight - this._triggerRect.height) / 2;\n const maxOptionsDisplayed = Math.floor(SELECT_PANEL_MAX_HEIGHT / itemHeight);\n let optionOffsetFromPanelTop: number;\n\n // Disable offset if requested by user by returning 0 as value to offset\n if (this.disableOptionCentering) {\n return 0;\n }\n\n if (this._scrollTop === 0) {\n optionOffsetFromPanelTop = selectedIndex * itemHeight;\n } else if (this._scrollTop === maxScroll) {\n const firstDisplayedIndex = this._getItemCount() - maxOptionsDisplayed;\n const selectedDisplayIndex = selectedIndex - firstDisplayedIndex;\n\n // The first item is partially out of the viewport. Therefore we need to calculate what\n // portion of it is shown in the viewport and account for it in our offset.\n let partialItemHeight =\n itemHeight - (this._getItemCount() * itemHeight - SELECT_PANEL_MAX_HEIGHT) % itemHeight;\n\n // Because the panel height is longer than the height of the options alone,\n // there is always extra padding at the top or bottom of the panel. When\n // scrolled to the very bottom, this padding is at the top of the panel and\n // must be added to the offset.\n optionOffsetFromPanelTop = selectedDisplayIndex * itemHeight + partialItemHeight;\n } else {\n // If the option was scrolled to the middle of the panel using a scroll buffer,\n // its offset will be the scroll buffer minus the half height that was added to\n // center it.\n optionOffsetFromPanelTop = scrollBuffer - itemHeight / 2;\n }\n\n // The final offset is the option's offset from the top, adjusted for the height difference,\n // multiplied by -1 to ensure that the overlay moves in the correct direction up the page.\n // The value is rounded to prevent some browsers from blurring the content.\n return Math.round(optionOffsetFromPanelTop * -1 - optionHeightAdjustment);\n }\n\n /**\n * Checks that the attempted overlay position will fit within the viewport.\n * If it will not fit, tries to adjust the scroll position and the associated\n * y-offset so the panel can open fully on-screen. If it still won't fit,\n * sets the offset back to 0 to allow the fallback position to take over.\n */\n private _checkOverlayWithinViewport(maxScroll: number): void {\n const itemHeight = this._getItemHeight();\n const viewportSize = this._viewportRuler.getViewportSize();\n\n const topSpaceAvailable = this._triggerRect.top - SELECT_PANEL_VIEWPORT_PADDING;\n const bottomSpaceAvailable =\n viewportSize.height - this._triggerRect.bottom - SELECT_PANEL_VIEWPORT_PADDING;\n\n const panelHeightTop = Math.abs(this._offsetY);\n const totalPanelHeight =\n Math.min(this._getItemCount() * itemHeight, SELECT_PANEL_MAX_HEIGHT);\n const panelHeightBottom = totalPanelHeight - panelHeightTop - this._triggerRect.height;\n\n if (panelHeightBottom > bottomSpaceAvailable) {\n this._adjustPanelUp(panelHeightBottom, bottomSpaceAvailable);\n } else if (panelHeightTop > topSpaceAvailable) {\n this._adjustPanelDown(panelHeightTop, topSpaceAvailable, maxScroll);\n } else {\n this._transformOrigin = this._getOriginBasedOnOption();\n }\n }\n\n /** Adjusts the overlay panel up to fit in the viewport. */\n private _adjustPanelUp(panelHeightBottom: number, bottomSpaceAvailable: number) {\n // Browsers ignore fractional scroll offsets, so we need to round.\n const distanceBelowViewport = Math.round(panelHeightBottom - bottomSpaceAvailable);\n\n // Scrolls the panel up by the distance it was extending past the boundary, then\n // adjusts the offset by that amount to move the panel up into the viewport.\n this._scrollTop -= distanceBelowViewport;\n this._offsetY -= distanceBelowViewport;\n this._transformOrigin = this._getOriginBasedOnOption();\n\n // If the panel is scrolled to the very top, it won't be able to fit the panel\n // by scrolling, so set the offset to 0 to allow the fallback position to take\n // effect.\n if (this._scrollTop <= 0) {\n this._scrollTop = 0;\n this._offsetY = 0;\n this._transformOrigin = `50% bottom 0px`;\n }\n }\n\n /** Adjusts the overlay panel down to fit in the viewport. */\n private _adjustPanelDown(panelHeightTop: number, topSpaceAvailable: number,\n maxScroll: number) {\n // Browsers ignore fractional scroll offsets, so we need to round.\n const distanceAboveViewport = Math.round(panelHeightTop - topSpaceAvailable);\n\n // Scrolls the panel down by the distance it was extending past the boundary, then\n // adjusts the offset by that amount to move the panel down into the viewport.\n this._scrollTop += distanceAboveViewport;\n this._offsetY += distanceAboveViewport;\n this._transformOrigin = this._getOriginBasedOnOption();\n\n // If the panel is scrolled to the very bottom, it won't be able to fit the\n // panel by scrolling, so set the offset to 0 to allow the fallback position\n // to take effect.\n if (this._scrollTop >= maxScroll) {\n this._scrollTop = maxScroll;\n this._offsetY = 0;\n this._transformOrigin = `50% top 0px`;\n return;\n }\n }\n\n /** Calculates the scroll position and x- and y-offsets of the overlay panel. */\n private _calculateOverlayPosition(): void {\n const itemHeight = this._getItemHeight();\n const items = this._getItemCount();\n const panelHeight = Math.min(items * itemHeight, SELECT_PANEL_MAX_HEIGHT);\n const scrollContainerHeight = items * itemHeight;\n\n // The farthest the panel can be scrolled before it hits the bottom\n const maxScroll = scrollContainerHeight - panelHeight;\n\n // If no value is selected we open the popup to the first item.\n let selectedOptionOffset: number;\n\n if (this.empty) {\n selectedOptionOffset = 0;\n } else {\n selectedOptionOffset =\n Math.max(this.options.toArray().indexOf(this._selectionModel.selected[0]), 0);\n }\n\n selectedOptionOffset += _countGroupLabelsBeforeOption(selectedOptionOffset, this.options,\n this.optionGroups);\n\n // We must maintain a scroll buffer so the selected option will be scrolled to the\n // center of the overlay panel rather than the top.\n const scrollBuffer = panelHeight / 2;\n this._scrollTop = this._calculateOverlayScroll(selectedOptionOffset, scrollBuffer, maxScroll);\n this._offsetY = this._calculateOverlayOffsetY(selectedOptionOffset, scrollBuffer, maxScroll);\n\n this._checkOverlayWithinViewport(maxScroll);\n }\n\n /** Sets the transform origin point based on the selected option. */\n private _getOriginBasedOnOption(): string {\n const itemHeight = this._getItemHeight();\n const optionHeightAdjustment = (itemHeight - this._triggerRect.height) / 2;\n const originY = Math.abs(this._offsetY) - optionHeightAdjustment + itemHeight / 2;\n return `50% ${originY}px 0px`;\n }\n\n /** Calculates the height of the select's options. */\n private _getItemHeight(): number {\n return this._triggerFontSize * SELECT_ITEM_HEIGHT_EM;\n }\n\n /** Calculates the amount of items in the select. This includes options and group labels. */\n private _getItemCount(): number {\n return this.options.length + this.optionGroups.length;\n }\n\n}\n","\n
\n
\n {{placeholder}}\n \n {{triggerValue}}\n \n \n
\n\n
\n
\n\n\n
\n \n \n
\n \n\n","/**\n * @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 {OverlayModule} from '@angular/cdk/overlay';\nimport {CommonModule} from '@angular/common';\nimport {NgModule} from '@angular/core';\nimport {MatCommonModule, MatOptionModule} from '@angular/material/core';\nimport {MatFormFieldModule} from '@angular/material/form-field';\nimport {CdkScrollableModule} from '@angular/cdk/scrolling';\nimport {MAT_SELECT_SCROLL_STRATEGY_PROVIDER, MatSelect, MatSelectTrigger} from './select';\n\n\n@NgModule({\n imports: [\n CommonModule,\n OverlayModule,\n MatOptionModule,\n MatCommonModule,\n ],\n exports: [\n CdkScrollableModule,\n MatFormFieldModule,\n MatSelect,\n MatSelectTrigger,\n MatOptionModule,\n MatCommonModule\n ],\n declarations: [MatSelect, MatSelectTrigger],\n providers: [MAT_SELECT_SCROLL_STRATEGY_PROVIDER]\n})\nexport class MatSelectModule {}\n","/**\n * @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\nexport * from './select-module';\nexport * from './select-animations';\nexport {\n MAT_SELECT_SCROLL_STRATEGY,\n MAT_SELECT_SCROLL_STRATEGY_PROVIDER_FACTORY,\n MatSelectConfig,\n MAT_SELECT_CONFIG,\n MAT_SELECT_SCROLL_STRATEGY_PROVIDER,\n MatSelectChange,\n MAT_SELECT_TRIGGER,\n _MatSelectBase,\n MatSelect,\n MatSelectTrigger\n} from './select';\n","/**\n * Generated bundle index. Do not edit.\n */\n\nexport * from 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