perf(material/button): do not run change detection when the anchor is…

… clicked (#23992)

(cherry picked from commit 41f0244)

src/material-experimental/mdc-button/BUILD.bazel

@@ -102,6 +102,7 @@ ng_test_library(
     deps = [
         ":mdc-button",
         "//src/cdk/platform",
+        "//src/cdk/testing/private",
         "//src/material-experimental/mdc-core",
         "//src/material/button",
         "@npm//@angular/platform-browser",

src/material-experimental/mdc-button/button-base.ts

@@ -7,7 +7,7 @@
  */
 
 import {Platform} from '@angular/cdk/platform';
-import {Directive, ElementRef, NgZone, ViewChild} from '@angular/core';
+import {Directive, ElementRef, NgZone, OnDestroy, OnInit, ViewChild} from '@angular/core';
 import {
   CanColor,
   CanDisable,
@@ -155,23 +155,29 @@ export const MAT_ANCHOR_HOST = {
 /**
  * Anchor button base.
  */
-@Directive({
-  host: {
-    '(click)': '_haltDisabledEvents($event)',
-  },
-})
-export class MatAnchorBase extends MatButtonBase {
+@Directive()
+export class MatAnchorBase extends MatButtonBase implements OnInit, OnDestroy {
   tabIndex: number;
 
   constructor(elementRef: ElementRef, platform: Platform, ngZone: NgZone, animationMode?: string) {
     super(elementRef, platform, ngZone, animationMode);
   }
 
-  _haltDisabledEvents(event: Event) {
+  ngOnInit(): void {
+    this._ngZone.runOutsideAngular(() => {
+      this._elementRef.nativeElement.addEventListener('click', this._haltDisabledEvents);
+    });
+  }
+
+  ngOnDestroy(): void {
+    this._elementRef.nativeElement.removeEventListener('click', this._haltDisabledEvents);
+  }
+
+  _haltDisabledEvents = (event: Event): void => {
     // A disabled button shouldn't apply any actions
     if (this.disabled) {
       event.preventDefault();
       event.stopImmediatePropagation();
     }
-  }
+  };
 }

src/material-experimental/mdc-button/button.spec.ts

@@ -1,8 +1,9 @@
 import {waitForAsync, ComponentFixture, TestBed} from '@angular/core/testing';
-import {Component, DebugElement} from '@angular/core';
+import {ApplicationRef, Component, DebugElement} from '@angular/core';
 import {By} from '@angular/platform-browser';
 import {MatButtonModule, MatButton, MatFabDefaultOptions, MAT_FAB_DEFAULT_OPTIONS} from './index';
 import {MatRipple, ThemePalette} from '@angular/material-experimental/mdc-core';
+import {createMouseEvent, dispatchEvent} from '@angular/cdk/testing/private';
 
 describe('MDC-based MatButton', () => {
   beforeEach(
@@ -229,6 +230,28 @@ describe('MDC-based MatButton', () => {
         .withContext('Expected custom tabindex to be overwritten when disabled.')
         .toBe('-1');
     });
+
+    describe('change detection behavior', () => {
+      it('should not run change detection for disabled anchor but should prevent the default behavior and stop event propagation', () => {
+        const appRef = TestBed.inject(ApplicationRef);
+        const fixture = TestBed.createComponent(TestApp);
+        fixture.componentInstance.isDisabled = true;
+        fixture.detectChanges();
+        const anchorElement = fixture.debugElement.query(By.css('a'))!.nativeElement;
+
+        spyOn(appRef, 'tick');
+
+        const event = createMouseEvent('click');
+        spyOn(event, 'preventDefault').and.callThrough();
+        spyOn(event, 'stopImmediatePropagation').and.callThrough();
+
+        dispatchEvent(anchorElement, event);
+
+        expect(appRef.tick).not.toHaveBeenCalled();
+        expect(event.preventDefault).toHaveBeenCalled();
+        expect(event.stopImmediatePropagation).toHaveBeenCalled();
+      });
+    });
   });
 
   // Ripple tests.

src/material/button/BUILD.bazel

@@ -52,6 +52,7 @@ ng_test_library(
     ),
     deps = [
         ":button",
+        "//src/cdk/testing/private",
         "//src/material/core",
         "@npm//@angular/platform-browser",
     ],

src/material/button/button.spec.ts

@@ -1,8 +1,9 @@
 import {waitForAsync, ComponentFixture, TestBed} from '@angular/core/testing';
-import {Component, DebugElement} from '@angular/core';
+import {ApplicationRef, Component, DebugElement} from '@angular/core';
 import {By} from '@angular/platform-browser';
 import {MatButtonModule, MatButton} from './index';
 import {MatRipple, ThemePalette} from '@angular/material/core';
+import {createMouseEvent, dispatchEvent} from '@angular/cdk/testing/private';
 
 describe('MatButton', () => {
   beforeEach(
@@ -243,6 +244,28 @@ describe('MatButton', () => {
         .withContext('Expected custom tabindex to be overwritten when disabled.')
         .toBe('-1');
     });
+
+    describe('change detection behavior', () => {
+      it('should not run change detection for disabled anchor but should prevent the default behavior and stop event propagation', () => {
+        const appRef = TestBed.inject(ApplicationRef);
+        const fixture = TestBed.createComponent(TestApp);
+        fixture.componentInstance.isDisabled = true;
+        fixture.detectChanges();
+        const anchorElement = fixture.debugElement.query(By.css('a'))!.nativeElement;
+
+        spyOn(appRef, 'tick');
+
+        const event = createMouseEvent('click');
+        spyOn(event, 'preventDefault').and.callThrough();
+        spyOn(event, 'stopImmediatePropagation').and.callThrough();
+
+        dispatchEvent(anchorElement, event);
+
+        expect(appRef.tick).not.toHaveBeenCalled();
+        expect(event.preventDefault).toHaveBeenCalled();
+        expect(event.stopImmediatePropagation).toHaveBeenCalled();
+      });
+    });
   });
 
   // Ripple tests.

src/material/button/button.ts

@@ -18,6 +18,7 @@ import {
   Inject,
   Input,
   AfterViewInit,
+  NgZone,
 } from '@angular/core';
 import {
   CanColor,
@@ -164,7 +165,6 @@ export class MatButton
     '[attr.tabindex]': 'disabled ? -1 : (tabIndex || 0)',
     '[attr.disabled]': 'disabled || null',
     '[attr.aria-disabled]': 'disabled.toString()',
-    '(click)': '_haltDisabledEvents($event)',
     '[class._mat-animation-noopable]': '_animationMode === "NoopAnimations"',
     '[class.mat-button-disabled]': 'disabled',
     'class': 'mat-focus-indicator',
@@ -175,23 +175,43 @@ export class MatButton
   encapsulation: ViewEncapsulation.None,
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class MatAnchor extends MatButton {
+export class MatAnchor extends MatButton implements AfterViewInit, OnDestroy {
   /** Tabindex of the button. */
   @Input() tabIndex: number;
 
   constructor(
     focusMonitor: FocusMonitor,
     elementRef: ElementRef,
     @Optional() @Inject(ANIMATION_MODULE_TYPE) animationMode: string,
+    /** @breaking-change 14.0.0 _ngZone will be required. */
+    @Optional() private _ngZone?: NgZone,
   ) {
     super(elementRef, focusMonitor, animationMode);
   }
 
-  _haltDisabledEvents(event: Event) {
+  override ngAfterViewInit(): void {
+    super.ngAfterViewInit();
+
+    /** @breaking-change 14.0.0 _ngZone will be required. */
+    if (this._ngZone) {
+      this._ngZone.runOutsideAngular(() => {
+        this._elementRef.nativeElement.addEventListener('click', this._haltDisabledEvents);
+      });
+    } else {
+      this._elementRef.nativeElement.addEventListener('click', this._haltDisabledEvents);
+    }
+  }
+
+  override ngOnDestroy(): void {
+    super.ngOnDestroy();
+    this._elementRef.nativeElement.removeEventListener('click', this._haltDisabledEvents);
+  }
+
+  _haltDisabledEvents = (event: Event): void => {
     // A disabled button shouldn't apply any actions
     if (this.disabled) {
       event.preventDefault();
       event.stopImmediatePropagation();
     }
-  }
+  };
 }

tools/public_api_guard/material/button.md

@@ -17,18 +17,24 @@ import { FocusOrigin } from '@angular/cdk/a11y';
 import * as i0 from '@angular/core';
 import * as i2 from '@angular/material/core';
 import { MatRipple } from '@angular/material/core';
+import { NgZone } from '@angular/core';
 import { OnDestroy } from '@angular/core';
 
 // @public
-export class MatAnchor extends MatButton {
-    constructor(focusMonitor: FocusMonitor, elementRef: ElementRef, animationMode: string);
+export class MatAnchor extends MatButton implements AfterViewInit, OnDestroy {
+    constructor(focusMonitor: FocusMonitor, elementRef: ElementRef, animationMode: string,
+    _ngZone?: NgZone | undefined);
     // (undocumented)
-    _haltDisabledEvents(event: Event): void;
+    _haltDisabledEvents: (event: Event) => void;
+    // (undocumented)
+    ngAfterViewInit(): void;
+    // (undocumented)
+    ngOnDestroy(): void;
     tabIndex: number;
     // (undocumented)
     static ɵcmp: i0.ɵɵComponentDeclaration<MatAnchor, "a[mat-button], a[mat-raised-button], a[mat-icon-button], a[mat-fab],             a[mat-mini-fab], a[mat-stroked-button], a[mat-flat-button]", ["matButton", "matAnchor"], { "disabled": "disabled"; "disableRipple": "disableRipple"; "color": "color"; "tabIndex": "tabIndex"; }, {}, never, ["*"]>;
     // (undocumented)
-    static ɵfac: i0.ɵɵFactoryDeclaration<MatAnchor, [null, null, { optional: true; }]>;
+    static ɵfac: i0.ɵɵFactoryDeclaration<MatAnchor, [null, null, { optional: true; }, { optional: true; }]>;
 }
 
 // @public