fix(material-experimental/mdc-form-field): Properly handle when defau…

…lts setting is 'dynamic' and the subscriptSizing input is not present. (angular#24263)

src/material-experimental/mdc-form-field/form-field.ts

@@ -91,7 +91,7 @@ const DEFAULT_APPEARANCE: MatFormFieldAppearance = 'fill';
 /** Default appearance used by the form-field. */
 const DEFAULT_FLOAT_LABEL: FloatLabelType = 'auto';
 
-/** Default way that the suffix element height is set. */
+/** Default way that the subscript element height is set. */
 const DEFAULT_SUBSCRIPT_SIZING: SubscriptSizing = 'fixed';
 
 /**
@@ -225,7 +225,7 @@ export class MatFormField
   set subscriptSizing(value: SubscriptSizing) {
     this._subscriptSizing = value || this._defaults?.subscriptSizing || DEFAULT_SUBSCRIPT_SIZING;
   }
-  private _subscriptSizing: SubscriptSizing = DEFAULT_SUBSCRIPT_SIZING;
+  private _subscriptSizing: SubscriptSizing | null = null;
 
   /** Text for the form field hint. */
   @Input()

src/material-experimental/mdc-input/input.spec.ts

@@ -1430,7 +1430,7 @@ describe('MatFormField default options', () => {
     );
   });
 
-  it('changes the default value of subscriptSizing', () => {
+  it('changes the default value of subscriptSizing (undefined input)', () => {
     const fixture = createComponent(MatInputWithSubscriptSizing, [
       {
         provide: MAT_FORM_FIELD_DEFAULT_OPTIONS,
@@ -1448,6 +1448,25 @@ describe('MatFormField default options', () => {
         .classList.contains('mat-mdc-form-field-subscript-dynamic-size'),
     ).toBe(true);
   });
+
+  it('changes the default value of subscriptSizing (no input)', () => {
+    const fixture = createComponent(MatInputWithAppearance, [
+      {
+        provide: MAT_FORM_FIELD_DEFAULT_OPTIONS,
+        useValue: {
+          subscriptSizing: 'dynamic',
+        },
+      },
+    ]);
+
+    fixture.detectChanges();
+    expect(fixture.componentInstance.formField.subscriptSizing).toBe('dynamic');
+    expect(
+      fixture.nativeElement
+        .querySelector('.mat-mdc-form-field-subscript-wrapper')
+        .classList.contains('mat-mdc-form-field-subscript-dynamic-size'),
+    ).toBe(true);
+  });
 });
 
 function configureTestingModule(

src/material/datepicker/calendar-body.ts

@@ -18,6 +18,7 @@ import {
   OnChanges,
   SimpleChanges,
   OnDestroy,
+  AfterViewChecked
 } from '@angular/core';
 import {take} from 'rxjs/operators';
 
@@ -67,13 +68,18 @@ export interface MatCalendarUserEvent<D> {
   encapsulation: ViewEncapsulation.None,
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class MatCalendarBody implements OnChanges, OnDestroy {
+export class MatCalendarBody implements OnChanges, OnDestroy, AfterViewChecked  {
   /**
    * Used to skip the next focus event when rendering the preview range.
    * We need a flag like this, because some browsers fire focus events asynchronously.
    */
   private _skipNextFocus: boolean;
 
+  /**
+   * Used to schedule focusing the active cell after change detection has run.
+   */
+  private _focusActiveCellAfterViewChecked = false;
+
   /** The label for the table. (e.g. "Jan 2017"). */
   @Input() label: string;
 
@@ -96,7 +102,13 @@ export class MatCalendarBody implements OnChanges, OnDestroy {
   @Input() numCols: number = 7;
 
   /** The cell number of the active cell in the table. */
-  @Input() activeCell: number = 0;
+  @Input() get activeCell(): number {
+    return this._activeCell;
+  }
+  set activeCell(activeCell: number) {
+    this._activeCell = activeCell;
+  }
+  private _activeCell: number = 0;
 
   /** Whether a range is being selected. */
   @Input() isRange: boolean = false;
@@ -183,6 +195,13 @@ export class MatCalendarBody implements OnChanges, OnDestroy {
     element.removeEventListener('blur', this._leaveHandler, true);
   }
 
+  ngAfterViewChecked() {
+    if (this._focusActiveCellAfterViewChecked) {
+      this._focusActiveCell();
+      this._focusActiveCellAfterViewChecked = false;
+    }
+  }
+
   /** Returns whether a cell is active. */
   _isActiveCell(rowIndex: number, colIndex: number): boolean {
     let cellNumber = rowIndex * this.numCols + colIndex;
@@ -214,6 +233,11 @@ export class MatCalendarBody implements OnChanges, OnDestroy {
     });
   }
 
+  /** Focuses the active cell after change detection has run and the microtask queue is empty. */
+  _scheduleFocusActiveCell() {
+    this._focusActiveCellAfterViewChecked = true;
+  }
+
   /** Gets whether a value is the start of the main range. */
   _isRangeStart(value: number) {
     return isStart(value, this.startValue, this.endValue);

src/material/datepicker/month-view.ts

@@ -329,7 +329,7 @@ export class MatMonthView<D> implements AfterContentInit, OnChanges, OnDestroy {
       this.activeDateChange.emit(this.activeDate);
     }
 
-    this._focusActiveCell();
+    this._scheduleFocusActiveCell();
     // Prevent unexpected default actions such as form submission.
     event.preventDefault();
   }
@@ -376,6 +376,10 @@ export class MatMonthView<D> implements AfterContentInit, OnChanges, OnDestroy {
     this._matCalendarBody._focusActiveCell(movePreview);
   }
 
+  _scheduleFocusActiveCell() {
+    this._matCalendarBody._scheduleFocusActiveCell();
+  }
+
   /** Called when the user has activated a new cell and the preview needs to be updated. */
   _previewChanged({event, value: cell}: MatCalendarUserEvent<MatCalendarCell<D> | null>) {
     if (this._rangeStrategy) {