fix(progress-spinner): unable to change mode on spinner directive

Currently we have the `mat-spinner` directive which is a shortcut to a `mat-progress-spinner` with `mode="indeterminate"`. Since the spinner inherits all of the inputs from the progress spinner, there's nothing stoping people from changing the mode back to `determinate`, however the element will look half-broken because the host bindings assume that the mode won't change. These changes update the host bindings to allow switching between modes.

Fixes #14511.

src/lib/progress-spinner/progress-spinner-module.ts

@@ -8,19 +8,17 @@
 import {NgModule} from '@angular/core';
 import {CommonModule} from '@angular/common';
 import {MatCommonModule} from '@angular/material/core';
-import {MatProgressSpinner, MatSpinner} from './progress-spinner';
+import {MatProgressSpinner} from './progress-spinner';
 
 
 @NgModule({
   imports: [MatCommonModule, CommonModule],
   exports: [
     MatProgressSpinner,
-    MatSpinner,
     MatCommonModule
   ],
   declarations: [
     MatProgressSpinner,
-    MatSpinner
   ],
 })
 class MatProgressSpinnerModule {}

src/lib/progress-spinner/progress-spinner.spec.ts

@@ -22,6 +22,7 @@ describe('MatProgressSpinner', () => {
         ProgressSpinnerCustomDiameter,
         SpinnerWithColor,
         ProgressSpinnerWithStringValues,
+        SpinnerWithMode,
       ],
     }).compileComponents();
   }));
@@ -296,6 +297,14 @@ describe('MatProgressSpinner', () => {
     expect(progressElement.componentInstance.strokeWidth).toBe(7);
   });
 
+  it('should be able to change the mode on a mat-spinner', () => {
+    const fixture = TestBed.createComponent(SpinnerWithMode);
+    fixture.detectChanges();
+
+    const progressElement = fixture.debugElement.query(By.css('mat-spinner')).nativeElement;
+    expect(progressElement.getAttribute('mode')).toBe('determinate');
+  });
+
 });
 
 
@@ -335,3 +344,7 @@ class ProgressSpinnerWithColor { color: string = 'primary'; }
   `
 })
 class ProgressSpinnerWithStringValues { }
+
+@Component({template: '<mat-spinner mode="determinate"></mat-spinner>'})
+class SpinnerWithMode { }
+

src/lib/progress-spinner/progress-spinner.ts

@@ -104,7 +104,7 @@ const INDETERMINATE_ANIMATION_TEMPLATE = `
  */
 @Component({
   moduleId: module.id,
-  selector: 'mat-progress-spinner',
+  selector: 'mat-progress-spinner, mat-spinner',
   exportAs: 'matProgressSpinner',
   host: {
     'role': 'progressbar',
@@ -186,6 +186,10 @@ export class MatProgressSpinner extends _MatProgressSpinnerMixinBase implements
     super(_elementRef);
     this._fallbackAnimation = platform.EDGE || platform.TRIDENT;
 
+    if (_elementRef.nativeElement.nodeName.toLowerCase() === 'mat-spinner') {
+      this.mode = 'indeterminate';
+    }
+
     if (defaults) {
       if (defaults.diameter) {
         this.diameter = defaults.diameter;
@@ -265,39 +269,3 @@ export class MatProgressSpinner extends _MatProgressSpinnerMixinBase implements
         .replace(/DIAMETER/g, `${this.diameter}`);
   }
 }
-
-
-/**
- * `<mat-spinner>` component.
- *
- * This is a component definition to be used as a convenience reference to create an
- * indeterminate `<mat-progress-spinner>` instance.
- */
-@Component({
-  moduleId: module.id,
-  selector: 'mat-spinner',
-  host: {
-    'role': 'progressbar',
-    'mode': 'indeterminate',
-    'class': 'mat-spinner mat-progress-spinner',
-    '[class._mat-animation-noopable]': `_noopAnimations`,
-    '[style.width.px]': 'diameter',
-    '[style.height.px]': 'diameter',
-  },
-  inputs: ['color'],
-  templateUrl: 'progress-spinner.html',
-  styleUrls: ['progress-spinner.css'],
-  changeDetection: ChangeDetectionStrategy.OnPush,
-  encapsulation: ViewEncapsulation.None,
-})
-export class MatSpinner extends MatProgressSpinner {
-  constructor(elementRef: ElementRef, platform: Platform,
-              @Optional() @Inject(DOCUMENT) document: any,
-              // @breaking-change 8.0.0 animationMode and defaults parameters to be made required.
-              @Optional() @Inject(ANIMATION_MODULE_TYPE) animationMode?: string,
-              @Inject(MAT_PROGRESS_SPINNER_DEFAULT_OPTIONS)
-                  defaults?: MatProgressSpinnerDefaultOptions) {
-    super(elementRef, platform, document, animationMode, defaults);
-    this.mode = 'indeterminate';
-  }
-}

src/lib/progress-spinner/public-api.ts

@@ -9,3 +9,9 @@
 export * from './progress-spinner-module';
 export * from './progress-spinner';
 
+/**
+ * @deprecated Import `MatProgressSpinner` instead. Note that the
+ *    `mat-spinner` selector isn't deprecated.
+ * @breaking-change 8.0.0
+ */
+export {MatProgressSpinner as MatSpinner} from './progress-spinner';