fix(material/input): Number input not changing on wheel interaction

In blink and webkit browsers the default behavior of increasing or decreasing a focused number input on wheel events is broken until a wheel event listener is explicitly added.

Fixes angular#29074

src/dev-app/input/BUILD.bazel

@@ -21,6 +21,7 @@ ng_module(
         "//src/material/input",
         "//src/material/tabs",
         "//src/material/toolbar",
+        "//src/material/tooltip",
         "@npm//@angular/forms",
     ],
 )

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

@@ -58,6 +58,19 @@
   </mat-card-content>
 </mat-card>
 
+<mat-card class="demo-card demo-number-input-tooltip">
+  <mat-toolbar color="primary">Number Input + Tooltip</mat-toolbar>
+  <mat-card-content>
+    <form>
+      <mat-form-field>
+        <mat-label>Pump Flow</mat-label>
+        <input matNativeControl value="10" type="number"><!--  -->
+        <span matSuffix matTooltip="Milliliter per Minute">ml/min</span>
+      </mat-form-field>
+    </form>
+  </mat-card-content>
+</mat-card>
+
 <mat-card class="demo-card demo-basic">
   <mat-toolbar color="primary">Error messages</mat-toolbar>
   <mat-card-content>

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

@@ -28,6 +28,8 @@ import {MatCheckboxModule} from '@angular/material/checkbox';
 import {MatIconModule} from '@angular/material/icon';
 import {MatTabsModule} from '@angular/material/tabs';
 import {MatToolbarModule} from '@angular/material/toolbar';
+import {MatTooltipModule} from '@angular/material/tooltip';
+import {Platform} from '@angular/cdk/platform';
 
 let max = 5;
 
@@ -55,6 +57,7 @@ const EMAIL_REGEX = /^[a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA
     FormFieldCustomControlExample,
     MyTelInput,
     ReactiveFormsModule,
+    MatTooltipModule,
   ],
 })
 export class InputDemo {

src/material/input/input.ts

@@ -87,6 +87,7 @@ export class MatInput
   private _inputValueAccessor: {value: any};
   private _previousPlaceholder: string | null;
   private _errorStateTracker: _ErrorStateTracker;
+  private _webkitBlinkWheelListenerAttached = false;
 
   /** Whether the component is being rendered on the server. */
   readonly _isServer: boolean;
@@ -197,6 +198,8 @@ export class MatInput
     if (!this._isTextarea && getSupportedInputTypes().has(this._type)) {
       (this._elementRef.nativeElement as HTMLInputElement).type = this._type;
     }
+
+    this._ensureWheelDefaultBehavior();
   }
   protected _type = 'text';
 
@@ -266,7 +269,7 @@ export class MatInput
     defaultErrorStateMatcher: ErrorStateMatcher,
     @Optional() @Self() @Inject(MAT_INPUT_VALUE_ACCESSOR) inputValueAccessor: any,
     private _autofillMonitor: AutofillMonitor,
-    ngZone: NgZone,
+    private _ngZone: NgZone,
     // TODO: Remove this once the legacy appearance has been removed. We only need
     // to inject the form field for determining whether the placeholder has been promoted.
     @Optional() @Inject(MAT_FORM_FIELD) protected _formField?: MatFormField,
@@ -287,7 +290,7 @@ export class MatInput
     // key. In order to get around this we need to "jiggle" the caret loose. Since this bug only
     // exists on iOS, we only bother to install the listener on iOS.
     if (_platform.IOS) {
-      ngZone.runOutsideAngular(() => {
+      _ngZone.runOutsideAngular(() => {
         _elementRef.nativeElement.addEventListener('keyup', this._iOSKeyupListener);
       });
     }
@@ -334,6 +337,10 @@ export class MatInput
     if (this._platform.IOS) {
       this._elementRef.nativeElement.removeEventListener('keyup', this._iOSKeyupListener);
     }
+
+    if (this._webkitBlinkWheelListenerAttached) {
+      this._elementRef.nativeElement.removeEventListener('wheel', this._webkitBlinkWheelListener);
+    }
   }
 
   ngDoCheck() {
@@ -527,4 +534,36 @@ export class MatInput
       el.setSelectionRange(0, 0);
     }
   };
+
+  private _webkitBlinkWheelListener = (): void => {
+    // This is a noop function and is used to enable mouse wheel input
+    // on number inputs
+    // on blink and webkit browsers.
+  };
+
+  /**
+   * In blink and webkit browsers a focused number input does not increment or decrement its value
+   * on mouse wheel interaction unless a wheel event listener is attached to it or one of its ancestors or a passive wheel listener is attached somewhere in the DOM.
+   * For example: Hitting a tooltip once enables the mouse wheel input for all number inputs as long as it exists.
+   * In order to get reliable and intuitive behavior we apply a wheel event on our own
+   * thus making sure increment and decrement by mouse wheel works every time.
+   * @docs-private
+   */
+  private _ensureWheelDefaultBehavior(): void {
+    if (
+      !this._webkitBlinkWheelListenerAttached &&
+      this._type === 'number' &&
+      (this._platform.BLINK || this._platform.WEBKIT)
+    ) {
+      this._ngZone.runOutsideAngular(() => {
+        this._elementRef.nativeElement.addEventListener('wheel', this._webkitBlinkWheelListener);
+      });
+      this._webkitBlinkWheelListenerAttached = true;
+    }
+
+    if (this._webkitBlinkWheelListenerAttached && this._type !== 'number') {
+      this._elementRef.nativeElement.removeEventListener('wheel', this._webkitBlinkWheelListener);
+      this._webkitBlinkWheelListenerAttached = true;
+    }
+  }
 }