@angular/material
Version:
Angular Material
357 lines • 44.1 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { coerceBooleanProperty } from '@angular/cdk/coercion';
import { TAB } from '@angular/cdk/keycodes';
import { ChangeDetectionStrategy, Component, ContentChildren, EventEmitter, forwardRef, Input, Output, QueryList, ViewEncapsulation, } from '@angular/core';
import { NG_VALUE_ACCESSOR } from '@angular/forms';
import { startWith, takeUntil } from 'rxjs/operators';
import { MatChipOption } from './chip-option';
import { MatChipSet } from './chip-set';
import * as i0 from "@angular/core";
/** Change event object that is emitted when the chip listbox value has changed. */
export class MatChipListboxChange {
constructor(
/** Chip listbox that emitted the event. */
source,
/** Value of the chip listbox when the event was emitted. */
value) {
this.source = source;
this.value = value;
}
}
/**
* Provider Expression that allows mat-chip-listbox to register as a ControlValueAccessor.
* This allows it to support [(ngModel)].
* @docs-private
*/
export const MAT_CHIP_LISTBOX_CONTROL_VALUE_ACCESSOR = {
provide: NG_VALUE_ACCESSOR,
useExisting: forwardRef(() => MatChipListbox),
multi: true,
};
/**
* An extension of the MatChipSet component that supports chip selection.
* Used with MatChipOption chips.
*/
export class MatChipListbox extends MatChipSet {
constructor() {
super(...arguments);
/**
* Function when touched. Set as part of ControlValueAccessor implementation.
* @docs-private
*/
this._onTouched = () => { };
/**
* Function when changed. Set as part of ControlValueAccessor implementation.
* @docs-private
*/
this._onChange = () => { };
// TODO: MDC uses `grid` here
this._defaultRole = 'listbox';
this._multiple = false;
/** Orientation of the chip list. */
this.ariaOrientation = 'horizontal';
this._selectable = true;
/**
* A 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.
*/
this.compareWith = (o1, o2) => o1 === o2;
this._required = false;
/** Event emitted when the selected chip listbox value has been changed by the user. */
this.change = new EventEmitter();
}
/** Whether the user should be allowed to select multiple chips. */
get multiple() {
return this._multiple;
}
set multiple(value) {
this._multiple = coerceBooleanProperty(value);
this._syncListboxProperties();
}
/** The array of selected chips inside the chip listbox. */
get selected() {
const selectedChips = this._chips.toArray().filter(chip => chip.selected);
return this.multiple ? selectedChips : selectedChips[0];
}
/**
* Whether or not this chip listbox is selectable.
*
* When a chip listbox is not selectable, the selected states for all
* the chips inside the chip listbox are always ignored.
*/
get selectable() {
return this._selectable;
}
set selectable(value) {
this._selectable = coerceBooleanProperty(value);
this._syncListboxProperties();
}
/** Whether this chip listbox is required. */
get required() {
return this._required;
}
set required(value) {
this._required = coerceBooleanProperty(value);
}
/** Combined stream of all of the child chips' selection change events. */
get chipSelectionChanges() {
return this._getChipStream(chip => chip.selectionChange);
}
/** Combined stream of all of the child chips' blur events. */
get chipBlurChanges() {
return this._getChipStream(chip => chip._onBlur);
}
/** The value of the listbox, which is the combined value of the selected chips. */
get value() {
return this._value;
}
set value(value) {
this.writeValue(value);
this._value = value;
}
ngAfterContentInit() {
if (this._pendingInitialValue !== undefined) {
Promise.resolve().then(() => {
this._setSelectionByValue(this._pendingInitialValue, false);
this._pendingInitialValue = undefined;
});
}
this._chips.changes.pipe(startWith(null), takeUntil(this._destroyed)).subscribe(() => {
// Update listbox selectable/multiple properties on chips
this._syncListboxProperties();
});
this.chipBlurChanges.pipe(takeUntil(this._destroyed)).subscribe(() => this._blur());
this.chipSelectionChanges.pipe(takeUntil(this._destroyed)).subscribe(event => {
if (!this.multiple) {
this._chips.forEach(chip => {
if (chip !== event.source) {
chip._setSelectedState(false, false, false);
}
});
}
if (event.isUserInput) {
this._propagateChanges();
}
});
}
/**
* Focuses the first selected chip in this chip listbox, or the first non-disabled chip when there
* are no selected chips.
*/
focus() {
if (this.disabled) {
return;
}
const firstSelectedChip = this._getFirstSelectedChip();
if (firstSelectedChip && !firstSelectedChip.disabled) {
firstSelectedChip.focus();
}
else if (this._chips.length > 0) {
this._keyManager.setFirstItemActive();
}
else {
this._elementRef.nativeElement.focus();
}
}
/**
* Implemented as part of ControlValueAccessor.
* @docs-private
*/
writeValue(value) {
if (this._chips) {
this._setSelectionByValue(value, false);
}
else if (value != null) {
this._pendingInitialValue = value;
}
}
/**
* Implemented as part of ControlValueAccessor.
* @docs-private
*/
registerOnChange(fn) {
this._onChange = fn;
}
/**
* Implemented as part of ControlValueAccessor.
* @docs-private
*/
registerOnTouched(fn) {
this._onTouched = fn;
}
/**
* Implemented as part of ControlValueAccessor.
* @docs-private
*/
setDisabledState(isDisabled) {
this.disabled = isDisabled;
}
/** Selects all chips with value. */
_setSelectionByValue(value, isUserInput = true) {
this._clearSelection();
if (Array.isArray(value)) {
value.forEach(currentValue => this._selectValue(currentValue, isUserInput));
}
else {
this._selectValue(value, isUserInput);
}
}
/** When blurred, marks the field as touched when focus moved outside the chip listbox. */
_blur() {
if (!this.disabled) {
// Wait to see if focus moves to an individual chip.
setTimeout(() => {
if (!this.focused) {
this._propagateChanges();
this._markAsTouched();
}
});
}
}
_keydown(event) {
if (event.keyCode === TAB) {
super._allowFocusEscape();
}
}
/** Marks the field as touched */
_markAsTouched() {
this._onTouched();
this._changeDetectorRef.markForCheck();
}
/** Emits change event to set the model value. */
_propagateChanges() {
let valueToEmit = null;
if (Array.isArray(this.selected)) {
valueToEmit = this.selected.map(chip => chip.value);
}
else {
valueToEmit = this.selected ? this.selected.value : undefined;
}
this._value = valueToEmit;
this.change.emit(new MatChipListboxChange(this, valueToEmit));
this._onChange(valueToEmit);
this._changeDetectorRef.markForCheck();
}
/**
* Deselects every chip in the listbox.
* @param skip Chip that should not be deselected.
*/
_clearSelection(skip) {
this._chips.forEach(chip => {
if (chip !== skip) {
chip.deselect();
}
});
}
/**
* Finds and selects the chip based on its value.
* @returns Chip that has the corresponding value.
*/
_selectValue(value, isUserInput) {
const correspondingChip = this._chips.find(chip => {
return chip.value != null && this.compareWith(chip.value, value);
});
if (correspondingChip) {
isUserInput ? correspondingChip.selectViaInteraction() : correspondingChip.select();
}
return correspondingChip;
}
/** Syncs the chip-listbox selection state with the individual chips. */
_syncListboxProperties() {
if (this._chips) {
// Defer setting the value in order to avoid the "Expression
// has changed after it was checked" errors from Angular.
Promise.resolve().then(() => {
this._chips.forEach(chip => {
chip._chipListMultiple = this.multiple;
chip.chipListSelectable = this._selectable;
chip._changeDetectorRef.markForCheck();
});
});
}
}
/** Returns the first selected chip in this listbox, or undefined if no chips are selected. */
_getFirstSelectedChip() {
if (Array.isArray(this.selected)) {
return this.selected.length ? this.selected[0] : undefined;
}
else {
return this.selected;
}
}
/**
* Determines if key manager should avoid putting a given chip action in the tab index. Skip
* non-interactive actions since the user can't do anything with them.
*/
_skipPredicate(action) {
// Override the skip predicate in the base class to avoid skipping disabled chips. Allow
// disabled chip options to receive focus to align with WAI ARIA recommendation. Normally WAI
// ARIA's instructions are to exclude disabled items from the tab order, but it makes a few
// exceptions for compound widgets.
//
// From [Developing a Keyboard Interface](
// https://www.w3.org/WAI/ARIA/apg/practices/keyboard-interface/):
// "For the following composite widget elements, keep them focusable when disabled: Options in a
// Listbox..."
return !action.isInteractive;
}
}
MatChipListbox.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.1.0", ngImport: i0, type: MatChipListbox, deps: null, target: i0.ɵɵFactoryTarget.Component });
MatChipListbox.ɵcmp = i0.ɵɵngDeclareComponent({ minVersion: "14.0.0", version: "15.1.0", type: MatChipListbox, selector: "mat-chip-listbox", inputs: { tabIndex: "tabIndex", multiple: "multiple", ariaOrientation: ["aria-orientation", "ariaOrientation"], selectable: "selectable", compareWith: "compareWith", required: "required", value: "value" }, outputs: { change: "change" }, host: { listeners: { "focus": "focus()", "blur": "_blur()", "keydown": "_keydown($event)" }, properties: { "attr.role": "role", "tabIndex": "empty ? -1 : tabIndex", "attr.aria-describedby": "_ariaDescribedby || null", "attr.aria-required": "role ? required : null", "attr.aria-disabled": "disabled.toString()", "attr.aria-multiselectable": "multiple", "attr.aria-orientation": "ariaOrientation", "class.mat-mdc-chip-list-disabled": "disabled", "class.mat-mdc-chip-list-required": "required" }, classAttribute: "mdc-evolution-chip-set mat-mdc-chip-listbox" }, providers: [MAT_CHIP_LISTBOX_CONTROL_VALUE_ACCESSOR], queries: [{ propertyName: "_chips", predicate: MatChipOption, descendants: true }], usesInheritance: true, ngImport: i0, template: `
<span class="mdc-evolution-chip-set__chips" role="presentation">
<ng-content></ng-content>
</span>
`, isInline: true, styles: [".mdc-evolution-chip-set{display:flex}.mdc-evolution-chip-set:focus{outline:none}.mdc-evolution-chip-set__chips{display:flex;flex-flow:wrap;min-width:0}.mdc-evolution-chip-set--overflow .mdc-evolution-chip-set__chips{flex-flow:nowrap}.mdc-evolution-chip-set .mdc-evolution-chip-set__chips{margin-left:-8px;margin-right:0}[dir=rtl] .mdc-evolution-chip-set .mdc-evolution-chip-set__chips,.mdc-evolution-chip-set .mdc-evolution-chip-set__chips[dir=rtl]{margin-left:0;margin-right:-8px}.mdc-evolution-chip-set .mdc-evolution-chip{margin-left:8px;margin-right:0}[dir=rtl] .mdc-evolution-chip-set .mdc-evolution-chip,.mdc-evolution-chip-set .mdc-evolution-chip[dir=rtl]{margin-left:0;margin-right:8px}.mdc-evolution-chip-set .mdc-evolution-chip{margin-top:4px;margin-bottom:4px}.mat-mdc-chip-set .mdc-evolution-chip-set__chips{min-width:100%}.mat-mdc-chip-set-stacked{flex-direction:column;align-items:flex-start}.mat-mdc-chip-set-stacked .mat-mdc-chip{width:100%}input.mat-mdc-chip-input{flex:1 0 150px;margin-left:8px}[dir=rtl] input.mat-mdc-chip-input{margin-left:0;margin-right:8px}"], changeDetection: i0.ChangeDetectionStrategy.OnPush, encapsulation: i0.ViewEncapsulation.None });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.1.0", ngImport: i0, type: MatChipListbox, decorators: [{
type: Component,
args: [{ selector: 'mat-chip-listbox', template: `
<span class="mdc-evolution-chip-set__chips" role="presentation">
<ng-content></ng-content>
</span>
`, inputs: ['tabIndex'], host: {
'class': 'mdc-evolution-chip-set mat-mdc-chip-listbox',
'[attr.role]': 'role',
'[tabIndex]': 'empty ? -1 : tabIndex',
// TODO: replace this binding with use of AriaDescriber
'[attr.aria-describedby]': '_ariaDescribedby || null',
'[attr.aria-required]': 'role ? required : null',
'[attr.aria-disabled]': 'disabled.toString()',
'[attr.aria-multiselectable]': 'multiple',
'[attr.aria-orientation]': 'ariaOrientation',
'[class.mat-mdc-chip-list-disabled]': 'disabled',
'[class.mat-mdc-chip-list-required]': 'required',
'(focus)': 'focus()',
'(blur)': '_blur()',
'(keydown)': '_keydown($event)',
}, providers: [MAT_CHIP_LISTBOX_CONTROL_VALUE_ACCESSOR], encapsulation: ViewEncapsulation.None, changeDetection: ChangeDetectionStrategy.OnPush, styles: [".mdc-evolution-chip-set{display:flex}.mdc-evolution-chip-set:focus{outline:none}.mdc-evolution-chip-set__chips{display:flex;flex-flow:wrap;min-width:0}.mdc-evolution-chip-set--overflow .mdc-evolution-chip-set__chips{flex-flow:nowrap}.mdc-evolution-chip-set .mdc-evolution-chip-set__chips{margin-left:-8px;margin-right:0}[dir=rtl] .mdc-evolution-chip-set .mdc-evolution-chip-set__chips,.mdc-evolution-chip-set .mdc-evolution-chip-set__chips[dir=rtl]{margin-left:0;margin-right:-8px}.mdc-evolution-chip-set .mdc-evolution-chip{margin-left:8px;margin-right:0}[dir=rtl] .mdc-evolution-chip-set .mdc-evolution-chip,.mdc-evolution-chip-set .mdc-evolution-chip[dir=rtl]{margin-left:0;margin-right:8px}.mdc-evolution-chip-set .mdc-evolution-chip{margin-top:4px;margin-bottom:4px}.mat-mdc-chip-set .mdc-evolution-chip-set__chips{min-width:100%}.mat-mdc-chip-set-stacked{flex-direction:column;align-items:flex-start}.mat-mdc-chip-set-stacked .mat-mdc-chip{width:100%}input.mat-mdc-chip-input{flex:1 0 150px;margin-left:8px}[dir=rtl] input.mat-mdc-chip-input{margin-left:0;margin-right:8px}"] }]
}], propDecorators: { multiple: [{
type: Input
}], ariaOrientation: [{
type: Input,
args: ['aria-orientation']
}], selectable: [{
type: Input
}], compareWith: [{
type: Input
}], required: [{
type: Input
}], value: [{
type: Input
}], change: [{
type: Output
}], _chips: [{
type: ContentChildren,
args: [MatChipOption, {
// We need to use `descendants: true`, because Ivy will no longer match
// indirect descendants if it's left as false.
descendants: true,
}]
}] } });
//# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {BooleanInput, coerceBooleanProperty} from '@angular/cdk/coercion';\nimport {MatChipAction} from './chip-action';\nimport {TAB} from '@angular/cdk/keycodes';\nimport {\n  AfterContentInit,\n  ChangeDetectionStrategy,\n  Component,\n  ContentChildren,\n  EventEmitter,\n  forwardRef,\n  Input,\n  OnDestroy,\n  Output,\n  QueryList,\n  ViewEncapsulation,\n} from '@angular/core';\nimport {ControlValueAccessor, NG_VALUE_ACCESSOR} from '@angular/forms';\nimport {Observable} from 'rxjs';\nimport {startWith, takeUntil} from 'rxjs/operators';\nimport {MatChip, MatChipEvent} from './chip';\nimport {MatChipOption, MatChipSelectionChange} from './chip-option';\nimport {MatChipSet} from './chip-set';\n\n/** Change event object that is emitted when the chip listbox value has changed. */\nexport class MatChipListboxChange {\n  constructor(\n    /** Chip listbox that emitted the event. */\n    public source: MatChipListbox,\n    /** Value of the chip listbox when the event was emitted. */\n    public value: any,\n  ) {}\n}\n\n/**\n * Provider Expression that allows mat-chip-listbox to register as a ControlValueAccessor.\n * This allows it to support [(ngModel)].\n * @docs-private\n */\nexport const MAT_CHIP_LISTBOX_CONTROL_VALUE_ACCESSOR: any = {\n  provide: NG_VALUE_ACCESSOR,\n  useExisting: forwardRef(() => MatChipListbox),\n  multi: true,\n};\n\n/**\n * An extension of the MatChipSet component that supports chip selection.\n * Used with MatChipOption chips.\n */\n@Component({\n  selector: 'mat-chip-listbox',\n  template: `\n    <span class=\"mdc-evolution-chip-set__chips\" role=\"presentation\">\n      <ng-content></ng-content>\n    </span>\n  `,\n  styleUrls: ['chip-set.css'],\n  inputs: ['tabIndex'],\n  host: {\n    'class': 'mdc-evolution-chip-set mat-mdc-chip-listbox',\n    '[attr.role]': 'role',\n    '[tabIndex]': 'empty ? -1 : tabIndex',\n    // TODO: replace this binding with use of AriaDescriber\n    '[attr.aria-describedby]': '_ariaDescribedby || null',\n    '[attr.aria-required]': 'role ? required : null',\n    '[attr.aria-disabled]': 'disabled.toString()',\n    '[attr.aria-multiselectable]': 'multiple',\n    '[attr.aria-orientation]': 'ariaOrientation',\n    '[class.mat-mdc-chip-list-disabled]': 'disabled',\n    '[class.mat-mdc-chip-list-required]': 'required',\n    '(focus)': 'focus()',\n    '(blur)': '_blur()',\n    '(keydown)': '_keydown($event)',\n  },\n  providers: [MAT_CHIP_LISTBOX_CONTROL_VALUE_ACCESSOR],\n  encapsulation: ViewEncapsulation.None,\n  changeDetection: ChangeDetectionStrategy.OnPush,\n})\nexport class MatChipListbox\n  extends MatChipSet\n  implements AfterContentInit, OnDestroy, ControlValueAccessor\n{\n  /**\n   * Function when touched. Set as part of ControlValueAccessor implementation.\n   * @docs-private\n   */\n  _onTouched = () => {};\n\n  /**\n   * Function when changed. Set as part of ControlValueAccessor implementation.\n   * @docs-private\n   */\n  _onChange: (value: any) => void = () => {};\n\n  // TODO: MDC uses `grid` here\n  protected override _defaultRole = 'listbox';\n\n  /** Value that was assigned before the listbox was initialized. */\n  private _pendingInitialValue: any;\n\n  /** Whether the user should be allowed to select multiple chips. */\n  @Input()\n  get multiple(): boolean {\n    return this._multiple;\n  }\n  set multiple(value: BooleanInput) {\n    this._multiple = coerceBooleanProperty(value);\n    this._syncListboxProperties();\n  }\n  private _multiple: boolean = false;\n\n  /** The array of selected chips inside the chip listbox. */\n  get selected(): MatChipOption[] | MatChipOption {\n    const selectedChips = this._chips.toArray().filter(chip => chip.selected);\n    return this.multiple ? selectedChips : selectedChips[0];\n  }\n\n  /** Orientation of the chip list. */\n  @Input('aria-orientation') ariaOrientation: 'horizontal' | 'vertical' = 'horizontal';\n\n  /**\n   * Whether or not this chip listbox is selectable.\n   *\n   * When a chip listbox is not selectable, the selected states for all\n   * the chips inside the chip listbox are always ignored.\n   */\n  @Input()\n  get selectable(): boolean {\n    return this._selectable;\n  }\n  set selectable(value: BooleanInput) {\n    this._selectable = coerceBooleanProperty(value);\n    this._syncListboxProperties();\n  }\n  protected _selectable: boolean = true;\n\n  /**\n   * A 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() compareWith: (o1: any, o2: any) => boolean = (o1: any, o2: any) => o1 === o2;\n\n  /** Whether this chip listbox is required. */\n  @Input()\n  get required(): boolean {\n    return this._required;\n  }\n  set required(value: BooleanInput) {\n    this._required = coerceBooleanProperty(value);\n  }\n  protected _required: boolean = false;\n\n  /** Combined stream of all of the child chips' selection change events. */\n  get chipSelectionChanges(): Observable<MatChipSelectionChange> {\n    return this._getChipStream<MatChipSelectionChange, MatChipOption>(chip => chip.selectionChange);\n  }\n\n  /** Combined stream of all of the child chips' blur events. */\n  get chipBlurChanges(): Observable<MatChipEvent> {\n    return this._getChipStream(chip => chip._onBlur);\n  }\n\n  /** The value of the listbox, which is the combined value of the selected chips. */\n  @Input()\n  get value(): any {\n    return this._value;\n  }\n  set value(value: any) {\n    this.writeValue(value);\n    this._value = value;\n  }\n  protected _value: any;\n\n  /** Event emitted when the selected chip listbox value has been changed by the user. */\n  @Output() readonly change: EventEmitter<MatChipListboxChange> =\n    new EventEmitter<MatChipListboxChange>();\n\n  @ContentChildren(MatChipOption, {\n    // We need to use `descendants: true`, because Ivy will no longer match\n    // indirect descendants if it's left as false.\n    descendants: true,\n  })\n  override _chips: QueryList<MatChipOption>;\n\n  ngAfterContentInit() {\n    if (this._pendingInitialValue !== undefined) {\n      Promise.resolve().then(() => {\n        this._setSelectionByValue(this._pendingInitialValue, false);\n        this._pendingInitialValue = undefined;\n      });\n    }\n\n    this._chips.changes.pipe(startWith(null), takeUntil(this._destroyed)).subscribe(() => {\n      // Update listbox selectable/multiple properties on chips\n      this._syncListboxProperties();\n    });\n\n    this.chipBlurChanges.pipe(takeUntil(this._destroyed)).subscribe(() => this._blur());\n    this.chipSelectionChanges.pipe(takeUntil(this._destroyed)).subscribe(event => {\n      if (!this.multiple) {\n        this._chips.forEach(chip => {\n          if (chip !== event.source) {\n            chip._setSelectedState(false, false, false);\n          }\n        });\n      }\n\n      if (event.isUserInput) {\n        this._propagateChanges();\n      }\n    });\n  }\n\n  /**\n   * Focuses the first selected chip in this chip listbox, or the first non-disabled chip when there\n   * are no selected chips.\n   */\n  override focus(): void {\n    if (this.disabled) {\n      return;\n    }\n\n    const firstSelectedChip = this._getFirstSelectedChip();\n\n    if (firstSelectedChip && !firstSelectedChip.disabled) {\n      firstSelectedChip.focus();\n    } else if (this._chips.length > 0) {\n      this._keyManager.setFirstItemActive();\n    } else {\n      this._elementRef.nativeElement.focus();\n    }\n  }\n\n  /**\n   * Implemented as part of ControlValueAccessor.\n   * @docs-private\n   */\n  writeValue(value: any): void {\n    if (this._chips) {\n      this._setSelectionByValue(value, false);\n    } else if (value != null) {\n      this._pendingInitialValue = value;\n    }\n  }\n\n  /**\n   * Implemented as part of ControlValueAccessor.\n   * @docs-private\n   */\n  registerOnChange(fn: (value: any) => void): void {\n    this._onChange = fn;\n  }\n\n  /**\n   * Implemented as part of ControlValueAccessor.\n   * @docs-private\n   */\n  registerOnTouched(fn: () => void): void {\n    this._onTouched = fn;\n  }\n\n  /**\n   * Implemented as part of ControlValueAccessor.\n   * @docs-private\n   */\n  setDisabledState(isDisabled: boolean): void {\n    this.disabled = isDisabled;\n  }\n\n  /** Selects all chips with value. */\n  _setSelectionByValue(value: any, isUserInput: boolean = true) {\n    this._clearSelection();\n\n    if (Array.isArray(value)) {\n      value.forEach(currentValue => this._selectValue(currentValue, isUserInput));\n    } else {\n      this._selectValue(value, isUserInput);\n    }\n  }\n\n  /** When blurred, marks the field as touched when focus moved outside the chip listbox. */\n  _blur() {\n    if (!this.disabled) {\n      // Wait to see if focus moves to an individual chip.\n      setTimeout(() => {\n        if (!this.focused) {\n          this._propagateChanges();\n          this._markAsTouched();\n        }\n      });\n    }\n  }\n\n  _keydown(event: KeyboardEvent) {\n    if (event.keyCode === TAB) {\n      super._allowFocusEscape();\n    }\n  }\n\n  /** Marks the field as touched */\n  private _markAsTouched() {\n    this._onTouched();\n    this._changeDetectorRef.markForCheck();\n  }\n\n  /** Emits change event to set the model value. */\n  private _propagateChanges(): void {\n    let valueToEmit: any = null;\n\n    if (Array.isArray(this.selected)) {\n      valueToEmit = this.selected.map(chip => chip.value);\n    } else {\n      valueToEmit = this.selected ? this.selected.value : undefined;\n    }\n    this._value = valueToEmit;\n    this.change.emit(new MatChipListboxChange(this, valueToEmit));\n    this._onChange(valueToEmit);\n    this._changeDetectorRef.markForCheck();\n  }\n\n  /**\n   * Deselects every chip in the listbox.\n   * @param skip Chip that should not be deselected.\n   */\n  private _clearSelection(skip?: MatChip): void {\n    this._chips.forEach(chip => {\n      if (chip !== skip) {\n        chip.deselect();\n      }\n    });\n  }\n\n  /**\n   * Finds and selects the chip based on its value.\n   * @returns Chip that has the corresponding value.\n   */\n  private _selectValue(value: any, isUserInput: boolean): MatChip | undefined {\n    const correspondingChip = this._chips.find(chip => {\n      return chip.value != null && this.compareWith(chip.value, value);\n    });\n\n    if (correspondingChip) {\n      isUserInput ? correspondingChip.selectViaInteraction() : correspondingChip.select();\n    }\n\n    return correspondingChip;\n  }\n\n  /** Syncs the chip-listbox selection state with the individual chips. */\n  private _syncListboxProperties() {\n    if (this._chips) {\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._chips.forEach(chip => {\n          chip._chipListMultiple = this.multiple;\n          chip.chipListSelectable = this._selectable;\n          chip._changeDetectorRef.markForCheck();\n        });\n      });\n    }\n  }\n\n  /** Returns the first selected chip in this listbox, or undefined if no chips are selected. */\n  private _getFirstSelectedChip(): MatChipOption | undefined {\n    if (Array.isArray(this.selected)) {\n      return this.selected.length ? this.selected[0] : undefined;\n    } else {\n      return this.selected;\n    }\n  }\n\n  /**\n   * Determines if key manager should avoid putting a given chip action in the tab index. Skip\n   * non-interactive actions since the user can't do anything with them.\n   */\n  protected override _skipPredicate(action: MatChipAction): boolean {\n    // Override the skip predicate in the base class to avoid skipping disabled chips. Allow\n    // disabled chip options to receive focus to align with WAI ARIA recommendation. Normally WAI\n    // ARIA's instructions are to exclude disabled items from the tab order, but it makes a few\n    // exceptions for compound widgets.\n    //\n    // From [Developing a Keyboard Interface](\n    // https://www.w3.org/WAI/ARIA/apg/practices/keyboard-interface/):\n    //   \"For the following composite widget elements, keep them focusable when disabled: Options in a\n    //   Listbox...\"\n    return !action.isInteractive;\n  }\n}\n"]}