feat(stepper): allow disabling ripples of headers (#14972)

* Adds a way for developers to disable ripples of the `MatStepHeader`. This is useful because currently developers have no way of specifically disabling ripples for a stepper (only disabling globally is possible)

Closes #14940.

src/dev-app/stepper/stepper-demo.html

@@ -1,8 +1,10 @@
 <mat-checkbox [(ngModel)]="isNonLinear">Disable linear mode</mat-checkbox>
+<mat-checkbox [(ngModel)]="disableRipple">Disable header ripple</mat-checkbox>
 
 <h3>Linear Vertical Stepper Demo using a single form</h3>
 <form [formGroup]="formGroup">
-  <mat-vertical-stepper #linearVerticalStepper="matVerticalStepper" formArrayName="formArray" [linear]="!isNonLinear">
+  <mat-vertical-stepper #linearVerticalStepper="matVerticalStepper" formArrayName="formArray"
+                        [linear]="!isNonLinear" [disableRipple]="disableRipple">
     <mat-step formGroupName="0" [stepControl]="formArray?.get([0])">
       <ng-template matStepLabel>Fill out your name</ng-template>
       <mat-form-field>
@@ -48,7 +50,8 @@
 </form>
 
 <h3>Linear Horizontal Stepper Demo using a different form for each step</h3>
-<mat-horizontal-stepper #linearHorizontalStepper="matHorizontalStepper" [linear]="!isNonLinear">
+<mat-horizontal-stepper #linearHorizontalStepper="matHorizontalStepper" [linear]="!isNonLinear"
+                        [disableRipple]="disableRipple">
   <mat-step [stepControl]="nameFormGroup">
     <form [formGroup]="nameFormGroup">
       <ng-template matStepLabel>Fill out your name</ng-template>

src/dev-app/stepper/stepper-demo.ts

@@ -19,6 +19,7 @@ export class StepperDemo implements OnInit {
   formGroup: FormGroup;
   isNonLinear = false;
   isNonEditable = false;
+  disableRipple = false;
 
   nameFormGroup: FormGroup;
   emailFormGroup: FormGroup;

src/lib/stepper/BUILD.bazel

@@ -62,6 +62,7 @@ ng_test_library(
     "//src/cdk/testing",
     "//src/lib/form-field",
     "//src/lib/input",
+    "//src/lib/core",
     ":stepper",
   ]
 )

src/lib/stepper/step-header.html

@@ -1,4 +1,7 @@
-<div class="mat-step-header-ripple" mat-ripple [matRippleTrigger]="_getHostElement()"></div>
+<div class="mat-step-header-ripple" matRipple
+     [matRippleTrigger]="_getHostElement()"
+     [matRippleDisabled]="disableRipple"></div>
+
 <div class="mat-step-icon-state-{{state}} mat-step-icon" [class.mat-step-icon-selected]="selected">
   <div class="mat-step-icon-content" [ngSwitch]="!!(iconOverrides && iconOverrides[state])">
     <ng-container

src/lib/stepper/step-header.ts

@@ -63,6 +63,9 @@ export class MatStepHeader extends CdkStepHeader implements OnDestroy {
   /** Whether the given step is optional. */
   @Input() optional: boolean;
 
+  /** Whether the ripple should be disabled. */
+  @Input() disableRipple: boolean;
+
   constructor(
     public _intl: MatStepperIntl,
     private _focusMonitor: FocusMonitor,

src/lib/stepper/stepper-horizontal.html

@@ -1,6 +1,6 @@
 <div class="mat-horizontal-stepper-header-container">
   <ng-container *ngFor="let step of steps; let i = index; let isLast = last">
-    <mat-step-header  class="mat-horizontal-stepper-header"
+    <mat-step-header class="mat-horizontal-stepper-header"
                      (click)="step.select()"
                      (keydown)="_onKeydown($event)"
                      [tabIndex]="_getFocusIndex() === i ? 0 : -1"
@@ -18,7 +18,8 @@
                      [active]="step.completed || selectedIndex === i || !linear"
                      [optional]="step.optional"
                      [errorMessage]="step.errorMessage"
-                     [iconOverrides]="_iconOverrides">
+                     [iconOverrides]="_iconOverrides"
+                     [disableRipple]="disableRipple">
     </mat-step-header>
     <div *ngIf="!isLast" class="mat-stepper-horizontal-line"></div>
   </ng-container>

src/lib/stepper/stepper-vertical.html

@@ -1,5 +1,5 @@
 <div class="mat-step" *ngFor="let step of steps; let i = index; let isLast = last">
-  <mat-step-header  class="mat-vertical-stepper-header"
+  <mat-step-header class="mat-vertical-stepper-header"
                    (click)="step.select()"
                    (keydown)="_onKeydown($event)"
                    [tabIndex]="_getFocusIndex() == i ? 0 : -1"
@@ -17,7 +17,8 @@
                    [active]="step.completed || selectedIndex === i || !linear"
                    [optional]="step.optional"
                    [errorMessage]="step.errorMessage"
-                   [iconOverrides]="_iconOverrides">
+                   [iconOverrides]="_iconOverrides"
+                   [disableRipple]="disableRipple">
   </mat-step-header>
 
   <div class="mat-vertical-content-container" [class.mat-stepper-vertical-line]="!isLast">

src/lib/stepper/stepper.spec.ts

@@ -28,11 +28,12 @@ import {
   Validators,
   FormBuilder
 } from '@angular/forms';
+import {MatRipple} from '@angular/material/core';
 import {By} from '@angular/platform-browser';
 import {NoopAnimationsModule} from '@angular/platform-browser/animations';
 import {Observable, Subject} from 'rxjs';
 import {map, take} from 'rxjs/operators';
-import {MatStepperModule} from './index';
+import {MatStepHeader, MatStepperModule} from './index';
 import {MatHorizontalStepper, MatStep, MatStepper, MatVerticalStepper} from './stepper';
 import {MatStepperNext, MatStepperPrevious} from './stepper-button';
 import {MatStepperIntl} from './stepper-intl';
@@ -795,6 +796,22 @@ describe('MatStepper', () => {
       let stepHeaders = fixture.debugElement.queryAll(By.css('.mat-vertical-stepper-header'));
       assertArrowKeyInteractionInRtl(fixture, stepHeaders);
     });
+
+    it('should be able to disable ripples', () => {
+      const fixture = createComponent(SimpleMatVerticalStepperApp);
+      fixture.detectChanges();
+
+      const stepHeaders = fixture.debugElement.queryAll(By.directive(MatStepHeader));
+      const headerRipples = stepHeaders.map(headerDebugEl =>
+        headerDebugEl.query(By.directive(MatRipple)).injector.get(MatRipple));
+
+      expect(headerRipples.every(ripple => ripple.disabled)).toBe(false);
+
+      fixture.componentInstance.disableRipple = true;
+      fixture.detectChanges();
+
+      expect(headerRipples.every(ripple => ripple.disabled)).toBe(true);
+    });
   });
 
   describe('horizontal stepper', () => {
@@ -836,6 +853,22 @@ describe('MatStepper', () => {
 
       assertArrowKeyInteractionInRtl(fixture, stepHeaders);
     });
+
+    it('should be able to disable ripples', () => {
+      const fixture = createComponent(SimpleMatHorizontalStepperApp);
+      fixture.detectChanges();
+
+      const stepHeaders = fixture.debugElement.queryAll(By.directive(MatStepHeader));
+      const headerRipples = stepHeaders.map(headerDebugEl =>
+          headerDebugEl.query(By.directive(MatRipple)).injector.get(MatRipple));
+
+      expect(headerRipples.every(ripple => ripple.disabled)).toBe(false);
+
+      fixture.componentInstance.disableRipple = true;
+      fixture.detectChanges();
+
+      expect(headerRipples.every(ripple => ripple.disabled)).toBe(true);
+    });
   });
 
   describe('linear stepper with valid step', () => {
@@ -1200,7 +1233,7 @@ class MatHorizontalStepperWithErrorsApp implements OnInit {
 
 @Component({
   template: `
-    <mat-horizontal-stepper>
+    <mat-horizontal-stepper [disableRipple]="disableRipple">
       <mat-step>
         <ng-template matStepLabel>Step 1</ng-template>
         Content 1
@@ -1229,11 +1262,12 @@ class MatHorizontalStepperWithErrorsApp implements OnInit {
 })
 class SimpleMatHorizontalStepperApp {
   inputLabel = 'Step 3';
+  disableRipple = false;
 }
 
 @Component({
   template: `
-    <mat-vertical-stepper>
+    <mat-vertical-stepper [disableRipple]="disableRipple">
       <mat-step>
         <ng-template matStepLabel>Step 1</ng-template>
         Content 1
@@ -1263,6 +1297,7 @@ class SimpleMatHorizontalStepperApp {
 class SimpleMatVerticalStepperApp {
   inputLabel = 'Step 3';
   showStepTwo = true;
+  disableRipple = false;
 }
 
 @Component({

src/lib/stepper/stepper.ts

@@ -97,6 +97,9 @@ export class MatStepper extends CdkStepper implements AfterContentInit {
   /** Event emitted when the current step is done transitioning in. */
   @Output() readonly animationDone: EventEmitter<void> = new EventEmitter<void>();
 
+  /** Whether ripples should be disabled for the step headers. */
+  @Input() disableRipple: boolean;
+
   /** Consumer-specified template-refs to be used to override the header icons. */
   _iconOverrides: {[key: string]: TemplateRef<MatStepperIconContext>} = {};
 

tools/public_api_guard/lib/stepper.d.ts

@@ -19,6 +19,7 @@ export declare class MatStep extends CdkStep implements ErrorStateMatcher {
 export declare class MatStepHeader extends CdkStepHeader implements OnDestroy {
     _intl: MatStepperIntl;
     active: boolean;
+    disableRipple: boolean;
     errorMessage: string;
     iconOverrides: {
         [key: string]: TemplateRef<MatStepperIconContext>;
@@ -49,6 +50,7 @@ export declare class MatStepper extends CdkStepper implements AfterContentInit {
     _stepHeader: QueryList<MatStepHeader>;
     _steps: QueryList<MatStep>;
     readonly animationDone: EventEmitter<void>;
+    disableRipple: boolean;
     ngAfterContentInit(): void;
 }