feat(material/radio): allow focus origin to be optional input in focus method

Author: jesscxu

src/material/expansion/expansion-panel-header.ts

@@ -190,8 +190,12 @@ export class MatExpansionPanelHeader implements AfterViewInit, OnDestroy, Focusa
    * @param origin Origin of the action that triggered the focus.
    * @docs-private
    */
-  focus(origin: FocusOrigin = 'program', options?: FocusOptions) {
-    this._focusMonitor.focusVia(this._element, origin, options);
+  focus(origin?: FocusOrigin, options?: FocusOptions) {
+    if (origin) {
+      this._focusMonitor.focusVia(this._element, origin, options);
+    } else {
+      this._element.nativeElement.focus(options);
+    }
   }
 
   ngAfterViewInit() {

src/material/radio/radio.spec.ts

@@ -598,6 +598,7 @@ describe('MatRadio', () => {
     let seasonRadioInstances: MatRadioButton[];
     let weatherRadioInstances: MatRadioButton[];
     let fruitRadioInstances: MatRadioButton[];
+    let fruitRadioNativeElements: HTMLElement[];
     let fruitRadioNativeInputs: HTMLElement[];
     let testComponent: StandaloneRadioButtons;
 
@@ -618,7 +619,7 @@ describe('MatRadio', () => {
           .filter(debugEl => debugEl.componentInstance.name == 'fruit')
           .map(debugEl => debugEl.componentInstance);
 
-      const fruitRadioNativeElements = radioDebugElements
+      fruitRadioNativeElements = radioDebugElements
           .filter(debugEl => debugEl.componentInstance.name == 'fruit')
           .map(debugEl => debugEl.nativeElement);
 
@@ -732,6 +733,14 @@ describe('MatRadio', () => {
       }
     });
 
+    it('should not change focus origin if origin not specified', () => {
+      fruitRadioInstances[0].focus('mouse');
+      fruitRadioInstances[1].focus();
+
+      expect(fruitRadioNativeElements[1].classList).toContain('cdk-focused');
+      expect(fruitRadioNativeElements[1].classList).toContain('cdk-mouse-focused');
+    });
+
     it('should not add the "name" attribute if it is not passed in', () => {
       const radio = fixture.debugElement.nativeElement.querySelector('#nameless input');
       expect(radio.hasAttribute('name')).toBe(false);

src/material/radio/radio.ts

@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {FocusMonitor} from '@angular/cdk/a11y';
+import {FocusMonitor, FocusOrigin} from '@angular/cdk/a11y';
 import {
   BooleanInput,
   coerceBooleanProperty,
@@ -516,8 +516,12 @@ export abstract class _MatRadioButtonBase extends _MatRadioButtonMixinBase imple
   }
 
   /** Focuses the radio button. */
-  focus(options?: FocusOptions): void {
-    this._focusMonitor.focusVia(this._inputElement, 'keyboard', options);
+  focus(origin?: FocusOrigin, options?: FocusOptions): void {
+    if (origin) {
+      this._focusMonitor.focusVia(this._inputElement, origin, options);
+    } else {
+      this._inputElement.nativeElement.focus(options);
+    }
   }
 
   /**