feat(radio): add provider for default color input

src/material/radio/radio.md

@@ -34,3 +34,13 @@ This internal radio button receives focus and is automatically labelled by the t
 `<mat-radio-button>` element.
 
 Radio button groups should be given a meaningful label via `aria-label` or `aria-labelledby`.
+
+### Default Color Configuration
+The default color for radio buttons can be configured globally using the `MAT_RADIO_DEFAULT_OPTIONS` provider
+
+```
+providers: [
+    provide: MAT_RADIO_DEFAULT_OPTIONS,
+    useValue: { color: 'accent' },
+]
+```

src/material/radio/radio.spec.ts

@@ -3,6 +3,8 @@ import {FormControl, FormsModule, NgModel, ReactiveFormsModule} from '@angular/f
 import {Component, DebugElement, ViewChild} from '@angular/core';
 import {By} from '@angular/platform-browser';
 import {dispatchFakeEvent} from '@angular/cdk/testing';
+
+import {MAT_RADIO_DEFAULT_OPTIONS} from './radio';
 import {MatRadioButton, MatRadioChange, MatRadioGroup, MatRadioModule} from './index';
 
 describe('MatRadio', () => {
@@ -796,6 +798,43 @@ describe('MatRadio', () => {
   });
 });
 
+describe('MatRadioDefaultOverrides', () => {
+  describe('when MAT_RADIO_DEFAULT_OPTIONS overridden', () => {
+    beforeEach(async(() => {
+      TestBed.configureTestingModule({
+        imports: [MatRadioModule, FormsModule],
+        declarations: [DefaultRadioButton, RadioButtonWithColorBinding],
+        providers: [{
+          provide: MAT_RADIO_DEFAULT_OPTIONS,
+          useValue: {color: 'primary'},
+        }],
+      });
+
+      TestBed.compileComponents();
+    }));
+    it('should override default color in Component', () => {
+      const fixture: ComponentFixture<DefaultRadioButton> =
+        TestBed.createComponent(DefaultRadioButton);
+      fixture.detectChanges();
+      const radioDebugElement: DebugElement =
+        fixture.debugElement.query(By.directive(MatRadioButton));
+      expect(
+        radioDebugElement.nativeElement.classList
+      ).toContain('mat-primary');
+    });
+    it('should not override explicit input bindings', () => {
+      const fixture: ComponentFixture<RadioButtonWithColorBinding> =
+        TestBed.createComponent(RadioButtonWithColorBinding);
+      fixture.detectChanges();
+      const radioDebugElement: DebugElement =
+        fixture.debugElement.query(By.directive(MatRadioButton));
+      expect(
+        radioDebugElement.nativeElement.classList
+      ).not.toContain('mat-primary');
+      expect(radioDebugElement.nativeElement.classList).toContain('mat-warn');
+    });
+  });
+});
 
 @Component({
   template: `
@@ -937,3 +976,13 @@ class TranscludingWrapper {}
   template: `<mat-radio-button tabindex="0"></mat-radio-button>`
 })
 class RadioButtonWithPredefinedTabindex {}
+
+@Component({
+  template: `<mat-radio-button></mat-radio-button>`
+})
+class DefaultRadioButton {}
+
+@Component({
+  template: `<mat-radio-button color="warn"></mat-radio-button>`
+})
+class RadioButtonWithColorBinding {}

src/material/radio/radio.ts

@@ -21,6 +21,7 @@ import {
   EventEmitter,
   forwardRef,
   Inject,
+  InjectionToken,
   Input,
   OnDestroy,
   OnInit,
@@ -43,6 +44,22 @@ import {
 import {ANIMATION_MODULE_TYPE} from '@angular/platform-browser/animations';
 
 
+export interface MatRadioDefaultOptions {
+  color: ThemePalette;
+}
+
+export const MAT_RADIO_DEFAULT_OPTIONS =
+  new InjectionToken<MatRadioDefaultOptions>('mat-radio-default-options', {
+  providedIn: 'root',
+  factory: MAT_RADIO_DEFAULT_OPTIONS_FACTORY
+});
+
+export function MAT_RADIO_DEFAULT_OPTIONS_FACTORY(): MatRadioDefaultOptions {
+  return {
+    color: 'accent'
+  };
+}
+
 // Increasing integer for generating unique ids for radio components.
 let nextUniqueId = 0;
 
@@ -433,7 +450,9 @@ export class MatRadioButton extends _MatRadioButtonMixinBase
   /** Theme color of the radio button. */
   @Input()
   get color(): ThemePalette {
-    return this._color || (this.radioGroup && this.radioGroup.color) || 'accent';
+    return this._color ||
+      (this.radioGroup && this.radioGroup.color) ||
+      this._providerOverride && this._providerOverride.color || 'accent';
   }
   set color(newValue: ThemePalette) { this._color = newValue; }
   private _color: ThemePalette;
@@ -474,7 +493,9 @@ export class MatRadioButton extends _MatRadioButtonMixinBase
               private _changeDetector: ChangeDetectorRef,
               private _focusMonitor: FocusMonitor,
               private _radioDispatcher: UniqueSelectionDispatcher,
-              @Optional() @Inject(ANIMATION_MODULE_TYPE) public _animationMode?: string) {
+              @Optional() @Inject(ANIMATION_MODULE_TYPE) public _animationMode?: string,
+                @Optional() @Inject(MAT_RADIO_DEFAULT_OPTIONS)
+                private _providerOverride?: MatRadioDefaultOptions) {
     super(elementRef);
 
     // Assertions. Ideally these should be stripped out by the compiler.

tools/public_api_guard/material/radio.d.ts

@@ -1,3 +1,7 @@
+export declare const MAT_RADIO_DEFAULT_OPTIONS: InjectionToken<MatRadioDefaultOptions>;
+
+export declare function MAT_RADIO_DEFAULT_OPTIONS_FACTORY(): MatRadioDefaultOptions;
+
 export declare const MAT_RADIO_GROUP_CONTROL_VALUE_ACCESSOR: any;
 
 export declare class MatRadioButton extends _MatRadioButtonMixinBase implements OnInit, AfterViewInit, OnDestroy, CanDisableRipple, HasTabIndex {
@@ -17,7 +21,7 @@ export declare class MatRadioButton extends _MatRadioButtonMixinBase implements
     radioGroup: MatRadioGroup;
     required: boolean;
     value: any;
-    constructor(radioGroup: MatRadioGroup, elementRef: ElementRef, _changeDetector: ChangeDetectorRef, _focusMonitor: FocusMonitor, _radioDispatcher: UniqueSelectionDispatcher, _animationMode?: string | undefined);
+    constructor(radioGroup: MatRadioGroup, elementRef: ElementRef, _changeDetector: ChangeDetectorRef, _focusMonitor: FocusMonitor, _radioDispatcher: UniqueSelectionDispatcher, _animationMode?: string | undefined, _providerOverride?: MatRadioDefaultOptions | undefined);
     _isRippleDisabled(): boolean;
     _markForCheck(): void;
     _onInputChange(event: Event): void;
@@ -36,6 +40,10 @@ export declare class MatRadioChange {
     value: any);
 }
 
+export interface MatRadioDefaultOptions {
+    color: ThemePalette;
+}
+
 export declare class MatRadioGroup implements AfterContentInit, ControlValueAccessor {
     _controlValueAccessorChangeFn: (value: any) => void;
     _radios: QueryList<MatRadioButton>;