feat(material-experimental/mdc-chips): Make chips editable by connecting to the mdc web editing interface

src/dev-app/mdc-chips/mdc-chips-demo.html

@@ -128,12 +128,18 @@ <h4>Multi selection</h4>
        {{disableInputs ? "Enable" : "Disable"}}
       </button>
 
+      <button mat-button (click)="editable = !editable">
+        {{editable ? "Disable editing" : "Enable editing"}}
+      </button>
+
       <h4>Input is last child of chip grid</h4>
 
       <mat-form-field class="demo-has-chip-list">
         <mat-chip-grid #chipGrid1 [(ngModel)]="selectedPeople" required [disabled]="disableInputs">
           <mat-chip-row *ngFor="let person of people"
-                   (removed)="remove(person)">
+                   [editable]="editable"
+                   (removed)="remove(person)"
+                   (edited)="edit(person, $event)">
             {{person.name}}
             <mat-icon matChipRemove>cancel</mat-icon>
           </mat-chip-row>

src/dev-app/mdc-chips/mdc-chips-demo.ts

@@ -9,7 +9,7 @@
 import {COMMA, ENTER} from '@angular/cdk/keycodes';
 import {Component} from '@angular/core';
 import {ThemePalette} from '@angular/material/core';
-import {MatChipInputEvent} from '@angular/material-experimental/mdc-chips';
+import {MatChipInputEvent, MatChipEditedEvent} from '@angular/material-experimental/mdc-chips';
 
 export interface Person {
   name: string;
@@ -32,6 +32,7 @@ export class MdcChipsDemo {
   addOnBlur = true;
   disabledListboxes = false;
   disableInputs = false;
+  editable = false;
   message = '';
 
   // Enter, comma, semi-colon
@@ -81,6 +82,18 @@ export class MdcChipsDemo {
     }
   }
 
+  edit(person: Person, event: MatChipEditedEvent): void {
+    if (!event.value.trim().length) {
+      this.remove(person);
+      return;
+    }
+
+    const index = this.people.indexOf(person);
+    const newPeople = this.people.slice();
+    newPeople[index] = {...newPeople[index], name: event.value};
+    this.people = newPeople;
+  }
+
   toggleVisible(): void {
     this.visible = false;
   }

src/material-experimental/mdc-chips/chip-edit-input.spec.ts

@@ -0,0 +1,52 @@
+import {Component, DebugElement} from '@angular/core';
+import {async, TestBed, ComponentFixture} from '@angular/core/testing';
+import {MatChipEditInput, MatChipsModule} from './index';
+import {By} from '@angular/platform-browser';
+
+
+describe('MDC-based MatChipEditInput', () => {
+  const DEFAULT_INITIAL_VALUE = 'INITIAL_VALUE';
+
+  let fixture: ComponentFixture<any>;
+  let inputDebugElement: DebugElement;
+  let inputInstance: MatChipEditInput;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      imports: [MatChipsModule],
+      declarations: [
+        ChipEditInputContainer,
+      ],
+    });
+
+    TestBed.compileComponents();
+
+    fixture = TestBed.createComponent(ChipEditInputContainer);
+    inputDebugElement = fixture.debugElement.query(By.directive(MatChipEditInput))!;
+    inputInstance = inputDebugElement.injector.get<MatChipEditInput>(MatChipEditInput);
+  }));
+
+  describe('on initialization', () => {
+    it('should set the initial input text', () => {
+      inputInstance.initialize(DEFAULT_INITIAL_VALUE);
+      expect(inputInstance.getNativeElement().textContent).toEqual(DEFAULT_INITIAL_VALUE);
+    });
+
+    it('should focus the input', () => {
+      inputInstance.initialize(DEFAULT_INITIAL_VALUE);
+      expect(document.activeElement).toEqual(inputInstance.getNativeElement());
+    });
+  });
+
+  it('should update the internal value as it is set', () => {
+    inputInstance.initialize(DEFAULT_INITIAL_VALUE);
+    const newValue = 'NEW_VALUE';
+    inputInstance.setValue(newValue);
+    expect(inputInstance.getValue()).toEqual(newValue);
+  });
+});
+
+@Component({
+  template: `<span matChipEditInput></span>`,
+})
+class ChipEditInputContainer {}

src/material-experimental/mdc-chips/chip-edit-input.ts

@@ -0,0 +1,60 @@
+/**
+ * @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 {
+  Directive,
+  ElementRef,
+  Inject,
+} from '@angular/core';
+import {DOCUMENT} from '@angular/common';
+
+/**
+ * A directive that makes a span editable and exposes functions to modify and retrieve the
+ * element's contents.
+ */
+@Directive({
+  selector: 'span[matChipEditInput]',
+  host: {
+    'class': 'mdc-chip__primary-action mat-chip-edit-input',
+    'role': 'textbox',
+    'tabindex': '-1',
+    'contenteditable': 'true',
+  },
+})
+export class MatChipEditInput {
+  constructor(
+    private readonly _elementRef: ElementRef,
+    @Inject(DOCUMENT) private readonly _document: any) {}
+
+  initialize(initialValue: string) {
+    this.getNativeElement().focus();
+    this.setValue(initialValue);
+  }
+
+  getNativeElement(): HTMLElement {
+    return this._elementRef.nativeElement;
+  }
+
+  setValue(value: string) {
+    this.getNativeElement().innerText = value;
+    this._moveCursorToEndOfInput();
+  }
+
+  getValue(): string {
+    return this.getNativeElement().textContent || '';
+  }
+
+  private _moveCursorToEndOfInput() {
+    const range = this._document.createRange();
+    range.selectNodeContents(this.getNativeElement());
+    range.collapse(false);
+    const sel = window.getSelection()!;
+    sel.removeAllRanges();
+    sel.addRange(range);
+  }
+}

src/material-experimental/mdc-chips/chip-grid.spec.ts

@@ -191,7 +191,7 @@ describe('MDC-based MatChipGrid', () => {
 
           // Focus and blur the middle item
           midItem.focus();
-          midItem._focusout();
+          (document.activeElement as HTMLElement).blur();
           tick();
           zone.simulateZoneExit();
 
@@ -244,7 +244,7 @@ describe('MDC-based MatChipGrid', () => {
 
       it('should have a focus indicator', () => {
         const focusableTextNativeElements = Array.from(chipGridNativeElement
-            .querySelectorAll('.mat-chip-row-focusable-text-content'));
+            .querySelectorAll('.mat-mdc-chip-row-focusable-text-content'));
 
         expect(focusableTextNativeElements
             .every(element => element.classList.contains('mat-mdc-focus-indicator'))).toBe(true);
@@ -502,6 +502,32 @@ describe('MDC-based MatChipGrid', () => {
         expect(manager.activeColumnIndex).toBe(0);
       });
 
+      it('should ignore all non-tab navigation keyboard events from an editing chip', () => {
+        setupStandardGrid();
+        manager = chipGridInstance._keyManager;
+        testComponent.editable = true;
+        fixture.detectChanges();
+
+        const array = chips.toArray();
+        const firstItem = array[0];
+        firstItem.focus();
+        firstItem._keydown(createKeyboardEvent('keydown', ENTER, 'Enter', document.activeElement!));
+        fixture.detectChanges();
+
+        const activeRowIndex = manager.activeRowIndex;
+        const activeColumnIndex = manager.activeColumnIndex;
+
+        const KEYS_TO_IGNORE = [HOME, END, LEFT_ARROW, RIGHT_ARROW];
+        for (const key of KEYS_TO_IGNORE) {
+          const event: KeyboardEvent =
+              createKeyboardEvent('keydown', key, undefined, document.activeElement!);
+          chipGridInstance._keydown(event);
+          fixture.detectChanges();
+
+          expect(manager.activeRowIndex).toBe(activeRowIndex);
+          expect(manager.activeColumnIndex).toBe(activeColumnIndex);
+        }
+      });
     });
   });
 
@@ -991,7 +1017,8 @@ describe('MDC-based MatChipGrid', () => {
 @Component({
   template: `
     <mat-chip-grid [tabIndex]="tabIndex" #chipGrid>
-      <mat-chip-row *ngFor="let i of chips">
+      <mat-chip-row *ngFor="let i of chips"
+                    [editable]="editable">
         {{name}} {{i + 1}}
       </mat-chip-row>
     </mat-chip-grid>
@@ -1001,6 +1028,7 @@ class StandardChipGrid {
   name: string = 'Test';
   tabIndex: number = 0;
   chips = [0, 1, 2, 3, 4];
+  editable = false;
 }
 
 @Component({

src/material-experimental/mdc-chips/chip-grid.ts

@@ -405,15 +405,16 @@ export class MatChipGrid extends _MatChipGridMixinBase implements AfterContentIn
     const target = event.target as HTMLElement;
     const keyCode = event.keyCode;
     const manager = this._keyManager;
-
-    // If they are on an empty input and hit backspace, focus the last chip
-    if (keyCode === BACKSPACE && this._isEmptyInput(target)) {
+    if (keyCode === TAB && target.id !== this._chipInput!.id) {
+      this._allowFocusEscape();
+    } else if (this._originatesFromEditingChip(event)) {
+      // No-op, let the editing chip handle all keyboard events except for Tab.
+    } else if (keyCode === BACKSPACE && this._isEmptyInput(target)) {
+      // If they are on an empty input and hit backspace, focus the last chip
       if (this._chips.length) {
         manager.setLastCellActive();
       }
       event.preventDefault();
-    } else if (keyCode === TAB && target.id !== this._chipInput!.id ) {
-      this._allowFocusEscape();
     } else if (this._originatesFromChip(event)) {
       if (keyCode === HOME) {
         manager.setFirstCellActive();

src/material-experimental/mdc-chips/chip-row.html

@@ -1,19 +1,32 @@
-<span class="mdc-chip__ripple"></span>
+<ng-container *ngIf="!_isEditing()">
+  <span class="mdc-chip__ripple"></span>
 
-<span matRipple class="mat-mdc-chip-ripple"
-     [matRippleAnimation]="_rippleAnimation"
-     [matRippleDisabled]="_isRippleDisabled()"
-     [matRippleCentered]="_isRippleCentered"
-     [matRippleTrigger]="_elementRef.nativeElement"></span>
+  <span matRipple class="mat-mdc-chip-ripple"
+       [matRippleAnimation]="_rippleAnimation"
+       [matRippleDisabled]="_isRippleDisabled()"
+       [matRippleCentered]="_isRippleCentered"
+       [matRippleTrigger]="_elementRef.nativeElement"></span>
+</ng-container>
 
-<div role="gridcell">
-  <div #chipContent tabindex="-1"
-       class="mat-chip-row-focusable-text-content mat-mdc-focus-indicator">
-  	 <ng-content select="mat-chip-avatar, [matChipAvatar]"></ng-content>
-  	 <span class="mdc-chip__text"><ng-content></ng-content></span>
-  	 <ng-content select="mat-chip-trailing-icon,[matChipTrailingIcon]"></ng-content>
+<div class="mat-mdc-chip-content">
+  <div role="gridcell">
+    <div #chipContent tabindex="-1"
+         class="mat-mdc-chip-row-focusable-text-content mat-mdc-focus-indicator mdc-chip__primary-action"
+         [attr.role]="editable ? 'button' : null">
+      <ng-content select="mat-chip-avatar, [matChipAvatar]"></ng-content>
+      <span class="mdc-chip__text"><ng-content></ng-content></span>
+      <ng-content select="mat-chip-trailing-icon,[matChipTrailingIcon]"></ng-content>
+    </div>
+  </div>
+  <div role="gridcell" *ngIf="removeIcon" class="mat-mdc-chip-remove-icon">
+    <ng-content select="[matChipRemove]"></ng-content>
   </div>
 </div>
-<div role="gridcell" *ngIf="removeIcon">
-  <ng-content select="[matChipRemove]"></ng-content>
-</div>
+
+<div *ngIf="_isEditing()" role="gridcell" class="mat-mdc-chip-edit-input-container">
+  <ng-content *ngIf="contentEditInput; else defaultMatChipEditInput"
+              select="[matChipEditInput]"></ng-content>
+  <ng-template #defaultMatChipEditInput>
+    <span matChipEditInput></span>
+  </ng-template>
+</div>