@angular/material
Version:
Angular Material
402 lines • 49.3 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 { hasModifierKey, TAB } from '@angular/cdk/keycodes';
import { booleanAttribute, ChangeDetectionStrategy, ChangeDetectorRef, Component, ContentChildren, ElementRef, EventEmitter, Input, Optional, Output, QueryList, Self, ViewEncapsulation, } from '@angular/core';
import { FormGroupDirective, NgControl, NgForm, Validators, } from '@angular/forms';
import { ErrorStateMatcher, _ErrorStateTracker } from '@angular/material/core';
import { MatFormFieldControl } from '@angular/material/form-field';
import { Subject, merge } from 'rxjs';
import { takeUntil } from 'rxjs/operators';
import { MatChipRow } from './chip-row';
import { MatChipSet } from './chip-set';
import { Directionality } from '@angular/cdk/bidi';
import * as i0 from "@angular/core";
import * as i1 from "@angular/cdk/bidi";
import * as i2 from "@angular/forms";
import * as i3 from "@angular/material/core";
/** Change event object that is emitted when the chip grid value has changed. */
export class MatChipGridChange {
constructor(
/** Chip grid that emitted the event. */
source,
/** Value of the chip grid when the event was emitted. */
value) {
this.source = source;
this.value = value;
}
}
/**
* An extension of the MatChipSet component used with MatChipRow chips and
* the matChipInputFor directive.
*/
export class MatChipGrid extends MatChipSet {
/**
* Implemented as part of MatFormFieldControl.
* @docs-private
*/
get disabled() {
return this.ngControl ? !!this.ngControl.disabled : this._disabled;
}
set disabled(value) {
this._disabled = value;
this._syncChipsState();
}
/**
* Implemented as part of MatFormFieldControl.
* @docs-private
*/
get id() {
return this._chipInput.id;
}
/**
* Implemented as part of MatFormFieldControl.
* @docs-private
*/
get empty() {
return ((!this._chipInput || this._chipInput.empty) && (!this._chips || this._chips.length === 0));
}
/**
* Implemented as part of MatFormFieldControl.
* @docs-private
*/
get placeholder() {
return this._chipInput ? this._chipInput.placeholder : this._placeholder;
}
set placeholder(value) {
this._placeholder = value;
this.stateChanges.next();
}
/** Whether any chips or the matChipInput inside of this chip-grid has focus. */
get focused() {
return this._chipInput.focused || this._hasFocusedChip();
}
/**
* Implemented as part of MatFormFieldControl.
* @docs-private
*/
get required() {
return this._required ?? this.ngControl?.control?.hasValidator(Validators.required) ?? false;
}
set required(value) {
this._required = value;
this.stateChanges.next();
}
/**
* Implemented as part of MatFormFieldControl.
* @docs-private
*/
get shouldLabelFloat() {
return !this.empty || this.focused;
}
/**
* Implemented as part of MatFormFieldControl.
* @docs-private
*/
get value() {
return this._value;
}
set value(value) {
this._value = value;
}
/** An object used to control when error messages are shown. */
get errorStateMatcher() {
return this._errorStateTracker.matcher;
}
set errorStateMatcher(value) {
this._errorStateTracker.matcher = value;
}
/** Combined stream of all of the child chips' blur events. */
get chipBlurChanges() {
return this._getChipStream(chip => chip._onBlur);
}
/** Whether the chip grid is in an error state. */
get errorState() {
return this._errorStateTracker.errorState;
}
set errorState(value) {
this._errorStateTracker.errorState = value;
}
constructor(elementRef, changeDetectorRef, dir, parentForm, parentFormGroup, defaultErrorStateMatcher, ngControl) {
super(elementRef, changeDetectorRef, dir);
this.ngControl = ngControl;
/**
* Implemented as part of MatFormFieldControl.
* @docs-private
*/
this.controlType = 'mat-chip-grid';
this._defaultRole = 'grid';
/**
* List of element ids to propagate to the chipInput's aria-describedby attribute.
*/
this._ariaDescribedbyIds = [];
/**
* 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 = () => { };
this._value = [];
/** Emits when the chip grid value has been changed by the user. */
this.change = new EventEmitter();
/**
* Emits whenever the raw value of the chip-grid changes. This is here primarily
* to facilitate the two-way binding for the `value` input.
* @docs-private
*/
this.valueChange = new EventEmitter();
this._chips = undefined;
/**
* Emits whenever the component state changes and should cause the parent
* form-field to update. Implemented as part of `MatFormFieldControl`.
* @docs-private
*/
this.stateChanges = new Subject();
if (this.ngControl) {
this.ngControl.valueAccessor = this;
}
this._errorStateTracker = new _ErrorStateTracker(defaultErrorStateMatcher, ngControl, parentFormGroup, parentForm, this.stateChanges);
}
ngAfterContentInit() {
this.chipBlurChanges.pipe(takeUntil(this._destroyed)).subscribe(() => {
this._blur();
this.stateChanges.next();
});
merge(this.chipFocusChanges, this._chips.changes)
.pipe(takeUntil(this._destroyed))
.subscribe(() => this.stateChanges.next());
}
ngAfterViewInit() {
super.ngAfterViewInit();
if (!this._chipInput && (typeof ngDevMode === 'undefined' || ngDevMode)) {
throw Error('mat-chip-grid must be used in combination with matChipInputFor.');
}
}
ngDoCheck() {
if (this.ngControl) {
// We need to re-evaluate this on every change detection cycle, because there are some
// error triggers that we can't subscribe to (e.g. parent form submissions). This means
// that whatever logic is in here has to be super lean or we risk destroying the performance.
this.updateErrorState();
}
}
ngOnDestroy() {
super.ngOnDestroy();
this.stateChanges.complete();
}
/** Associates an HTML input element with this chip grid. */
registerInput(inputElement) {
this._chipInput = inputElement;
this._chipInput.setDescribedByIds(this._ariaDescribedbyIds);
}
/**
* Implemented as part of MatFormFieldControl.
* @docs-private
*/
onContainerClick(event) {
if (!this.disabled && !this._originatesFromChip(event)) {
this.focus();
}
}
/**
* Focuses the first chip in this chip grid, or the associated input when there
* are no eligible chips.
*/
focus() {
if (this.disabled || this._chipInput.focused) {
return;
}
if (!this._chips.length || this._chips.first.disabled) {
// Delay until the next tick, because this can cause a "changed after checked"
// error if the input does something on focus (e.g. opens an autocomplete).
Promise.resolve().then(() => this._chipInput.focus());
}
else if (this._chips.length) {
this._keyManager.setFirstItemActive();
}
this.stateChanges.next();
}
/**
* Implemented as part of MatFormFieldControl.
* @docs-private
*/
setDescribedByIds(ids) {
// We must keep this up to date to handle the case where ids are set
// before the chip input is registered.
this._ariaDescribedbyIds = ids;
this._chipInput?.setDescribedByIds(ids);
}
/**
* Implemented as part of ControlValueAccessor.
* @docs-private
*/
writeValue(value) {
// The user is responsible for creating the child chips, so we just store the value.
this._value = 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;
this.stateChanges.next();
}
/** Refreshes the error state of the chip grid. */
updateErrorState() {
this._errorStateTracker.updateErrorState();
}
/** When blurred, mark the field as touched when focus moved outside the chip grid. */
_blur() {
if (!this.disabled) {
// Check whether the focus moved to chip input.
// If the focus is not moved to chip input, mark the field as touched. If the focus moved
// to chip input, do nothing.
// Timeout is needed to wait for the focus() event trigger on chip input.
setTimeout(() => {
if (!this.focused) {
this._propagateChanges();
this._markAsTouched();
}
});
}
}
/**
* Removes the `tabindex` from the chip grid and resets it back afterwards, allowing the
* user to tab out of it. This prevents the grid from capturing focus and redirecting
* it back to the first chip, creating a focus trap, if it user tries to tab away.
*/
_allowFocusEscape() {
if (!this._chipInput.focused) {
super._allowFocusEscape();
}
}
/** Handles custom keyboard events. */
_handleKeydown(event) {
if (event.keyCode === TAB) {
if (this._chipInput.focused &&
hasModifierKey(event, 'shiftKey') &&
this._chips.length &&
!this._chips.last.disabled) {
event.preventDefault();
if (this._keyManager.activeItem) {
this._keyManager.setActiveItem(this._keyManager.activeItem);
}
else {
this._focusLastChip();
}
}
else {
// Use the super method here since it doesn't check for the input
// focused state. This allows focus to escape if there's only one
// disabled chip left in the list.
super._allowFocusEscape();
}
}
else if (!this._chipInput.focused) {
super._handleKeydown(event);
}
this.stateChanges.next();
}
_focusLastChip() {
if (this._chips.length) {
this._chips.last.focus();
}
}
/** Emits change event to set the model value. */
_propagateChanges() {
const valueToEmit = this._chips.length ? this._chips.toArray().map(chip => chip.value) : [];
this._value = valueToEmit;
this.change.emit(new MatChipGridChange(this, valueToEmit));
this.valueChange.emit(valueToEmit);
this._onChange(valueToEmit);
this._changeDetectorRef.markForCheck();
}
/** Mark the field as touched */
_markAsTouched() {
this._onTouched();
this._changeDetectorRef.markForCheck();
this.stateChanges.next();
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.0.0", ngImport: i0, type: MatChipGrid, deps: [{ token: i0.ElementRef }, { token: i0.ChangeDetectorRef }, { token: i1.Directionality, optional: true }, { token: i2.NgForm, optional: true }, { token: i2.FormGroupDirective, optional: true }, { token: i3.ErrorStateMatcher }, { token: i2.NgControl, optional: true, self: true }], target: i0.ɵɵFactoryTarget.Component }); }
static { this.ɵcmp = i0.ɵɵngDeclareComponent({ minVersion: "16.1.0", version: "18.0.0", type: MatChipGrid, isStandalone: true, selector: "mat-chip-grid", inputs: { disabled: ["disabled", "disabled", booleanAttribute], placeholder: "placeholder", required: ["required", "required", booleanAttribute], value: "value", errorStateMatcher: "errorStateMatcher" }, outputs: { change: "change", valueChange: "valueChange" }, host: { listeners: { "focus": "focus()", "blur": "_blur()" }, properties: { "attr.role": "role", "attr.tabindex": "(disabled || (_chips && _chips.length === 0)) ? -1 : tabIndex", "attr.aria-disabled": "disabled.toString()", "attr.aria-invalid": "errorState", "class.mat-mdc-chip-list-disabled": "disabled", "class.mat-mdc-chip-list-invalid": "errorState", "class.mat-mdc-chip-list-required": "required" }, classAttribute: "mat-mdc-chip-set mat-mdc-chip-grid mdc-evolution-chip-set" }, providers: [{ provide: MatFormFieldControl, useExisting: MatChipGrid }], queries: [{ propertyName: "_chips", predicate: MatChipRow, descendants: true }], usesInheritance: true, ngImport: i0, template: `
<div class="mdc-evolution-chip-set__chips" role="presentation">
<ng-content></ng-content>
</div>
`, 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%}.mat-mdc-chip-set-stacked .mdc-evolution-chip__graphic{flex-grow:0}.mat-mdc-chip-set-stacked .mdc-evolution-chip__action--primary{flex-basis:100%;justify-content:start}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: "18.0.0", ngImport: i0, type: MatChipGrid, decorators: [{
type: Component,
args: [{ selector: 'mat-chip-grid', template: `
<div class="mdc-evolution-chip-set__chips" role="presentation">
<ng-content></ng-content>
</div>
`, host: {
'class': 'mat-mdc-chip-set mat-mdc-chip-grid mdc-evolution-chip-set',
'[attr.role]': 'role',
'[attr.tabindex]': '(disabled || (_chips && _chips.length === 0)) ? -1 : tabIndex',
'[attr.aria-disabled]': 'disabled.toString()',
'[attr.aria-invalid]': 'errorState',
'[class.mat-mdc-chip-list-disabled]': 'disabled',
'[class.mat-mdc-chip-list-invalid]': 'errorState',
'[class.mat-mdc-chip-list-required]': 'required',
'(focus)': 'focus()',
'(blur)': '_blur()',
}, providers: [{ provide: MatFormFieldControl, useExisting: MatChipGrid }], encapsulation: ViewEncapsulation.None, changeDetection: ChangeDetectionStrategy.OnPush, standalone: 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%}.mat-mdc-chip-set-stacked .mdc-evolution-chip__graphic{flex-grow:0}.mat-mdc-chip-set-stacked .mdc-evolution-chip__action--primary{flex-basis:100%;justify-content:start}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}"] }]
}], ctorParameters: () => [{ type: i0.ElementRef }, { type: i0.ChangeDetectorRef }, { type: i1.Directionality, decorators: [{
type: Optional
}] }, { type: i2.NgForm, decorators: [{
type: Optional
}] }, { type: i2.FormGroupDirective, decorators: [{
type: Optional
}] }, { type: i3.ErrorStateMatcher }, { type: i2.NgControl, decorators: [{
type: Optional
}, {
type: Self
}] }], propDecorators: { disabled: [{
type: Input,
args: [{ transform: booleanAttribute }]
}], placeholder: [{
type: Input
}], required: [{
type: Input,
args: [{ transform: booleanAttribute }]
}], value: [{
type: Input
}], errorStateMatcher: [{
type: Input
}], change: [{
type: Output
}], valueChange: [{
type: Output
}], _chips: [{
type: ContentChildren,
args: [MatChipRow, {
// 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 {hasModifierKey, TAB} from '@angular/cdk/keycodes';\nimport {\n  AfterContentInit,\n  AfterViewInit,\n  booleanAttribute,\n  ChangeDetectionStrategy,\n  ChangeDetectorRef,\n  Component,\n  ContentChildren,\n  DoCheck,\n  ElementRef,\n  EventEmitter,\n  Input,\n  OnDestroy,\n  Optional,\n  Output,\n  QueryList,\n  Self,\n  ViewEncapsulation,\n} from '@angular/core';\nimport {\n  ControlValueAccessor,\n  FormGroupDirective,\n  NgControl,\n  NgForm,\n  Validators,\n} from '@angular/forms';\nimport {ErrorStateMatcher, _ErrorStateTracker} from '@angular/material/core';\nimport {MatFormFieldControl} from '@angular/material/form-field';\nimport {MatChipTextControl} from './chip-text-control';\nimport {Observable, Subject, merge} from 'rxjs';\nimport {takeUntil} from 'rxjs/operators';\nimport {MatChipEvent} from './chip';\nimport {MatChipRow} from './chip-row';\nimport {MatChipSet} from './chip-set';\nimport {Directionality} from '@angular/cdk/bidi';\n\n/** Change event object that is emitted when the chip grid value has changed. */\nexport class MatChipGridChange {\n  constructor(\n    /** Chip grid that emitted the event. */\n    public source: MatChipGrid,\n    /** Value of the chip grid when the event was emitted. */\n    public value: any,\n  ) {}\n}\n\n/**\n * An extension of the MatChipSet component used with MatChipRow chips and\n * the matChipInputFor directive.\n */\n@Component({\n  selector: 'mat-chip-grid',\n  template: `\n    <div class=\"mdc-evolution-chip-set__chips\" role=\"presentation\">\n      <ng-content></ng-content>\n    </div>\n  `,\n  styleUrl: 'chip-set.css',\n  host: {\n    'class': 'mat-mdc-chip-set mat-mdc-chip-grid mdc-evolution-chip-set',\n    '[attr.role]': 'role',\n    '[attr.tabindex]': '(disabled || (_chips && _chips.length === 0)) ? -1 : tabIndex',\n    '[attr.aria-disabled]': 'disabled.toString()',\n    '[attr.aria-invalid]': 'errorState',\n    '[class.mat-mdc-chip-list-disabled]': 'disabled',\n    '[class.mat-mdc-chip-list-invalid]': 'errorState',\n    '[class.mat-mdc-chip-list-required]': 'required',\n    '(focus)': 'focus()',\n    '(blur)': '_blur()',\n  },\n  providers: [{provide: MatFormFieldControl, useExisting: MatChipGrid}],\n  encapsulation: ViewEncapsulation.None,\n  changeDetection: ChangeDetectionStrategy.OnPush,\n  standalone: true,\n})\nexport class MatChipGrid\n  extends MatChipSet\n  implements\n    AfterContentInit,\n    AfterViewInit,\n    ControlValueAccessor,\n    DoCheck,\n    MatFormFieldControl<any>,\n    OnDestroy\n{\n  /**\n   * Implemented as part of MatFormFieldControl.\n   * @docs-private\n   */\n  readonly controlType: string = 'mat-chip-grid';\n\n  /** The chip input to add more chips */\n  protected _chipInput: MatChipTextControl;\n\n  protected override _defaultRole = 'grid';\n  private _errorStateTracker: _ErrorStateTracker;\n\n  /**\n   * List of element ids to propagate to the chipInput's aria-describedby attribute.\n   */\n  private _ariaDescribedbyIds: string[] = [];\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  /**\n   * Implemented as part of MatFormFieldControl.\n   * @docs-private\n   */\n  @Input({transform: booleanAttribute})\n  override get disabled(): boolean {\n    return this.ngControl ? !!this.ngControl.disabled : this._disabled;\n  }\n  override set disabled(value: boolean) {\n    this._disabled = value;\n    this._syncChipsState();\n  }\n\n  /**\n   * Implemented as part of MatFormFieldControl.\n   * @docs-private\n   */\n  get id(): string {\n    return this._chipInput.id;\n  }\n\n  /**\n   * Implemented as part of MatFormFieldControl.\n   * @docs-private\n   */\n  override get empty(): boolean {\n    return (\n      (!this._chipInput || this._chipInput.empty) && (!this._chips || this._chips.length === 0)\n    );\n  }\n\n  /**\n   * Implemented as part of MatFormFieldControl.\n   * @docs-private\n   */\n  @Input()\n  get placeholder(): string {\n    return this._chipInput ? this._chipInput.placeholder : this._placeholder;\n  }\n  set placeholder(value: string) {\n    this._placeholder = value;\n    this.stateChanges.next();\n  }\n  protected _placeholder: string;\n\n  /** Whether any chips or the matChipInput inside of this chip-grid has focus. */\n  override get focused(): boolean {\n    return this._chipInput.focused || this._hasFocusedChip();\n  }\n\n  /**\n   * Implemented as part of MatFormFieldControl.\n   * @docs-private\n   */\n  @Input({transform: booleanAttribute})\n  get required(): boolean {\n    return this._required ?? this.ngControl?.control?.hasValidator(Validators.required) ?? false;\n  }\n  set required(value: boolean) {\n    this._required = value;\n    this.stateChanges.next();\n  }\n  protected _required: boolean | undefined;\n\n  /**\n   * Implemented as part of MatFormFieldControl.\n   * @docs-private\n   */\n  get shouldLabelFloat(): boolean {\n    return !this.empty || this.focused;\n  }\n\n  /**\n   * Implemented as part of MatFormFieldControl.\n   * @docs-private\n   */\n  @Input()\n  get value(): any {\n    return this._value;\n  }\n  set value(value: any) {\n    this._value = value;\n  }\n  protected _value: any[] = [];\n\n  /** An object used to control when error messages are shown. */\n  @Input()\n  get errorStateMatcher() {\n    return this._errorStateTracker.matcher;\n  }\n  set errorStateMatcher(value: ErrorStateMatcher) {\n    this._errorStateTracker.matcher = value;\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  /** Emits when the chip grid value has been changed by the user. */\n  @Output() readonly change: EventEmitter<MatChipGridChange> =\n    new EventEmitter<MatChipGridChange>();\n\n  /**\n   * Emits whenever the raw value of the chip-grid 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<any> = new EventEmitter<any>();\n\n  @ContentChildren(MatChipRow, {\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  // We need an initializer here to avoid a TS error. The value will be set in `ngAfterViewInit`.\n  override _chips: QueryList<MatChipRow> = undefined!;\n\n  /**\n   * Emits whenever the component state changes and should cause the parent\n   * form-field to update. Implemented as part of `MatFormFieldControl`.\n   * @docs-private\n   */\n  readonly stateChanges = new Subject<void>();\n\n  /** Whether the chip grid is in an error state. */\n  get errorState() {\n    return this._errorStateTracker.errorState;\n  }\n  set errorState(value: boolean) {\n    this._errorStateTracker.errorState = value;\n  }\n\n  constructor(\n    elementRef: ElementRef,\n    changeDetectorRef: ChangeDetectorRef,\n    @Optional() dir: Directionality,\n    @Optional() parentForm: NgForm,\n    @Optional() parentFormGroup: FormGroupDirective,\n    defaultErrorStateMatcher: ErrorStateMatcher,\n    @Optional() @Self() public ngControl: NgControl,\n  ) {\n    super(elementRef, changeDetectorRef, dir);\n\n    if (this.ngControl) {\n      this.ngControl.valueAccessor = this;\n    }\n\n    this._errorStateTracker = new _ErrorStateTracker(\n      defaultErrorStateMatcher,\n      ngControl,\n      parentFormGroup,\n      parentForm,\n      this.stateChanges,\n    );\n  }\n\n  ngAfterContentInit() {\n    this.chipBlurChanges.pipe(takeUntil(this._destroyed)).subscribe(() => {\n      this._blur();\n      this.stateChanges.next();\n    });\n\n    merge(this.chipFocusChanges, this._chips.changes)\n      .pipe(takeUntil(this._destroyed))\n      .subscribe(() => this.stateChanges.next());\n  }\n\n  override ngAfterViewInit() {\n    super.ngAfterViewInit();\n\n    if (!this._chipInput && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw Error('mat-chip-grid must be used in combination with matChipInputFor.');\n    }\n  }\n\n  ngDoCheck() {\n    if (this.ngControl) {\n      // We need to re-evaluate this on every change detection cycle, because there are some\n      // error triggers that we can't subscribe to (e.g. parent form submissions). This means\n      // that whatever logic is in here has to be super lean or we risk destroying the performance.\n      this.updateErrorState();\n    }\n  }\n\n  override ngOnDestroy() {\n    super.ngOnDestroy();\n    this.stateChanges.complete();\n  }\n\n  /** Associates an HTML input element with this chip grid. */\n  registerInput(inputElement: MatChipTextControl): void {\n    this._chipInput = inputElement;\n    this._chipInput.setDescribedByIds(this._ariaDescribedbyIds);\n  }\n\n  /**\n   * Implemented as part of MatFormFieldControl.\n   * @docs-private\n   */\n  onContainerClick(event: MouseEvent) {\n    if (!this.disabled && !this._originatesFromChip(event)) {\n      this.focus();\n    }\n  }\n\n  /**\n   * Focuses the first chip in this chip grid, or the associated input when there\n   * are no eligible chips.\n   */\n  override focus(): void {\n    if (this.disabled || this._chipInput.focused) {\n      return;\n    }\n\n    if (!this._chips.length || this._chips.first.disabled) {\n      // Delay until the next tick, because this can cause a \"changed after checked\"\n      // error if the input does something on focus (e.g. opens an autocomplete).\n      Promise.resolve().then(() => this._chipInput.focus());\n    } else if (this._chips.length) {\n      this._keyManager.setFirstItemActive();\n    }\n\n    this.stateChanges.next();\n  }\n\n  /**\n   * Implemented as part of MatFormFieldControl.\n   * @docs-private\n   */\n  setDescribedByIds(ids: string[]) {\n    // We must keep this up to date to handle the case where ids are set\n    // before the chip input is registered.\n    this._ariaDescribedbyIds = ids;\n    this._chipInput?.setDescribedByIds(ids);\n  }\n\n  /**\n   * Implemented as part of ControlValueAccessor.\n   * @docs-private\n   */\n  writeValue(value: any): void {\n    // The user is responsible for creating the child chips, so we just store the value.\n    this._value = value;\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    this.stateChanges.next();\n  }\n\n  /** Refreshes the error state of the chip grid. */\n  updateErrorState() {\n    this._errorStateTracker.updateErrorState();\n  }\n\n  /** When blurred, mark the field as touched when focus moved outside the chip grid. */\n  _blur() {\n    if (!this.disabled) {\n      // Check whether the focus moved to chip input.\n      // If the focus is not moved to chip input, mark the field as touched. If the focus moved\n      // to chip input, do nothing.\n      // Timeout is needed to wait for the focus() event trigger on chip input.\n      setTimeout(() => {\n        if (!this.focused) {\n          this._propagateChanges();\n          this._markAsTouched();\n        }\n      });\n    }\n  }\n\n  /**\n   * Removes the `tabindex` from the chip grid and resets it back afterwards, allowing the\n   * user to tab out of it. This prevents the grid from capturing focus and redirecting\n   * it back to the first chip, creating a focus trap, if it user tries to tab away.\n   */\n  protected override _allowFocusEscape() {\n    if (!this._chipInput.focused) {\n      super._allowFocusEscape();\n    }\n  }\n\n  /** Handles custom keyboard events. */\n  override _handleKeydown(event: KeyboardEvent) {\n    if (event.keyCode === TAB) {\n      if (\n        this._chipInput.focused &&\n        hasModifierKey(event, 'shiftKey') &&\n        this._chips.length &&\n        !this._chips.last.disabled\n      ) {\n        event.preventDefault();\n\n        if (this._keyManager.activeItem) {\n          this._keyManager.setActiveItem(this._keyManager.activeItem);\n        } else {\n          this._focusLastChip();\n        }\n      } else {\n        // Use the super method here since it doesn't check for the input\n        // focused state. This allows focus to escape if there's only one\n        // disabled chip left in the list.\n        super._allowFocusEscape();\n      }\n    } else if (!this._chipInput.focused) {\n      super._handleKeydown(event);\n    }\n\n    this.stateChanges.next();\n  }\n\n  _focusLastChip() {\n    if (this._chips.length) {\n      this._chips.last.focus();\n    }\n  }\n\n  /** Emits change event to set the model value. */\n  private _propagateChanges(): void {\n    const valueToEmit = this._chips.length ? this._chips.toArray().map(chip => chip.value) : [];\n    this._value = valueToEmit;\n    this.change.emit(new MatChipGridChange(this, valueToEmit));\n    this.valueChange.emit(valueToEmit);\n    this._onChange(valueToEmit);\n    this._changeDetectorRef.markForCheck();\n  }\n\n  /** Mark the field as touched */\n  private _markAsTouched() {\n    this._onTouched();\n    this._changeDetectorRef.markForCheck();\n    this.stateChanges.next();\n  }\n}\n"]}