feat(material/select): add a global option to specify overlay panel class

src/material-experimental/mdc-select/select.html

@@ -19,6 +19,7 @@
   cdkConnectedOverlayLockPosition
   cdkConnectedOverlayHasBackdrop
   cdkConnectedOverlayBackdropClass="cdk-overlay-transparent-backdrop"
+  [cdkConnectedOverlayPanelClass]="_overlayPanelClass"
   [cdkConnectedOverlayScrollStrategy]="_scrollStrategy"
   [cdkConnectedOverlayOrigin]="_preferredOverlayOrigin || fallbackOverlayOrigin"
   [cdkConnectedOverlayOpen]="panelOpen"

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

@@ -3732,21 +3732,26 @@ describe('MDC-based MatSelect', () => {
 
   });
 
-  it('should be able to provide default values through an injection token', () => {
+  it('should be able to provide default values through an injection token', fakeAsync(() => {
     configureMatSelectTestingModule([NgModelSelect], [{
       provide: MAT_SELECT_CONFIG,
       useValue: {
         disableOptionCentering: true,
-        typeaheadDebounceInterval: 1337
+        typeaheadDebounceInterval: 1337,
+        overlayPanelClass: 'test-panel-class',
       } as MatSelectConfig
     }]);
     const fixture = TestBed.createComponent(NgModelSelect);
     fixture.detectChanges();
     const select = fixture.componentInstance.select;
+    select.open();
+    fixture.detectChanges();
+    flush();
 
     expect(select.disableOptionCentering).toBe(true);
     expect(select.typeaheadDebounceInterval).toBe(1337);
-  });
+    expect(document.querySelector('.cdk-overlay-pane')?.classList).toContain('test-panel-class');
+  }));
 
   it('should not not throw if the select is inside an ng-container with ngIf', fakeAsync(() => {
     configureMatSelectTestingModule([SelectInNgContainer]);

src/material/select/select.html

@@ -19,6 +19,7 @@
   cdkConnectedOverlayLockPosition
   cdkConnectedOverlayHasBackdrop
   cdkConnectedOverlayBackdropClass="cdk-overlay-transparent-backdrop"
+  [cdkConnectedOverlayPanelClass]="_overlayPanelClass"
   [cdkConnectedOverlayScrollStrategy]="_scrollStrategy"
   [cdkConnectedOverlayOrigin]="origin"
   [cdkConnectedOverlayOpen]="panelOpen"

src/material/select/select.spec.ts

@@ -4583,21 +4583,26 @@ describe('MatSelect', () => {
 
   });
 
-  it('should be able to provide default values through an injection token', () => {
+  it('should be able to provide default values through an injection token', fakeAsync(() => {
     configureMatSelectTestingModule([NgModelSelect], [{
       provide: MAT_SELECT_CONFIG,
       useValue: {
         disableOptionCentering: true,
-        typeaheadDebounceInterval: 1337
+        typeaheadDebounceInterval: 1337,
+        overlayPanelClass: 'test-panel-class',
       } as MatSelectConfig
     }]);
     const fixture = TestBed.createComponent(NgModelSelect);
     fixture.detectChanges();
     const select = fixture.componentInstance.select;
+    select.open();
+    fixture.detectChanges();
+    flush();
 
     expect(select.disableOptionCentering).toBe(true);
     expect(select.typeaheadDebounceInterval).toBe(1337);
-  });
+    expect(document.querySelector('.cdk-overlay-pane')?.classList).toContain('test-panel-class');
+  }));
 
   it('should not not throw if the select is inside an ng-container with ngIf', fakeAsync(() => {
     configureMatSelectTestingModule([SelectInNgContainer]);

src/material/select/select.ts

@@ -179,6 +179,9 @@ export interface MatSelectConfig {
 
   /** Time to wait in milliseconds after the last keystroke before moving focus to an item. */
   typeaheadDebounceInterval?: number;
+
+  /** Class or list of classes to be applied to the menu's overlay panel. */
+  overlayPanelClass?: string | string[];
 }
 
 /** Injection token that can be used to provide the default options the select module. */
@@ -311,6 +314,8 @@ export abstract class _MatSelectBase<C> extends _MatSelectMixinBase implements A
   /** Strategy that will be used to handle scrolling while the select panel is open. */
   _scrollStrategy: ScrollStrategy;
 
+  _overlayPanelClass: string | string[] = this._defaultOptions?.overlayPanelClass || '';
+
   /** Whether the select is focused. */
   get focused(): boolean {
     return this._focused || this._panelOpen;
@@ -373,7 +378,7 @@ export abstract class _MatSelectBase<C> extends _MatSelectMixinBase implements A
   set disableOptionCentering(value: boolean) {
     this._disableOptionCentering = coerceBooleanProperty(value);
   }
-  private _disableOptionCentering: boolean = false;
+  private _disableOptionCentering = this._defaultOptions?.disableOptionCentering ?? false;
 
   /**
    * Function to compare the option values with the selected values. The first argument
@@ -422,7 +427,7 @@ export abstract class _MatSelectBase<C> extends _MatSelectMixinBase implements A
   set typeaheadDebounceInterval(value: number) {
     this._typeaheadDebounceInterval = coerceNumberProperty(value);
   }
-  private _typeaheadDebounceInterval: number;
+  private _typeaheadDebounceInterval = this._defaultOptions?.typeaheadDebounceInterval ?? 0;
 
   /**
    * Function used to sort the values in a select in multiple mode.
@@ -489,7 +494,7 @@ export abstract class _MatSelectBase<C> extends _MatSelectMixinBase implements A
     @Attribute('tabindex') tabIndex: string,
     @Inject(MAT_SELECT_SCROLL_STRATEGY) scrollStrategyFactory: any,
     private _liveAnnouncer: LiveAnnouncer,
-    @Optional() @Inject(MAT_SELECT_CONFIG) defaults?: MatSelectConfig) {
+    @Optional() @Inject(MAT_SELECT_CONFIG) private _defaultOptions?: MatSelectConfig) {
     super(elementRef, _defaultErrorStateMatcher, _parentForm,
           _parentFormGroup, ngControl);
 
@@ -505,16 +510,6 @@ export abstract class _MatSelectBase<C> extends _MatSelectMixinBase implements A
 
     // Force setter to be called in case id was not specified.
     this.id = this.id;
-
-    if (defaults) {
-      if (defaults.disableOptionCentering != null) {
-        this.disableOptionCentering = defaults.disableOptionCentering;
-      }
-
-      if (defaults.typeaheadDebounceInterval != null) {
-        this.typeaheadDebounceInterval = defaults.typeaheadDebounceInterval;
-      }
-    }
   }
 
   ngOnInit() {

tools/public_api_guard/material/select.d.ts

@@ -8,6 +8,7 @@ export declare abstract class _MatSelectBase<C> extends _MatSelectMixinBase impl
     _onChange: (value: any) => void;
     _onTouched: () => void;
     readonly _openedStream: Observable<void>;
+    _overlayPanelClass: string | string[];
     _panelDoneAnimatingStream: Subject<string>;
     protected _parentFormField: MatFormField;
     abstract _positions: ConnectedPosition[];
@@ -56,7 +57,7 @@ export declare abstract class _MatSelectBase<C> extends _MatSelectMixinBase impl
     get value(): any;
     set value(newValue: any);
     readonly valueChange: EventEmitter<any>;
-    constructor(_viewportRuler: ViewportRuler, _changeDetectorRef: ChangeDetectorRef, _ngZone: NgZone, _defaultErrorStateMatcher: ErrorStateMatcher, elementRef: ElementRef, _dir: Directionality, _parentForm: NgForm, _parentFormGroup: FormGroupDirective, _parentFormField: MatFormField, ngControl: NgControl, tabIndex: string, scrollStrategyFactory: any, _liveAnnouncer: LiveAnnouncer, defaults?: MatSelectConfig);
+    constructor(_viewportRuler: ViewportRuler, _changeDetectorRef: ChangeDetectorRef, _ngZone: NgZone, _defaultErrorStateMatcher: ErrorStateMatcher, elementRef: ElementRef, _dir: Directionality, _parentForm: NgForm, _parentFormGroup: FormGroupDirective, _parentFormField: MatFormField, ngControl: NgControl, tabIndex: string, scrollStrategyFactory: any, _liveAnnouncer: LiveAnnouncer, _defaultOptions?: MatSelectConfig | undefined);
     protected _canOpen(): boolean;
     _getAriaActiveDescendant(): string | null;
     protected abstract _getChangeEvent(value: any): C;
@@ -145,6 +146,7 @@ export declare class MatSelectChange {
 
 export interface MatSelectConfig {
     disableOptionCentering?: boolean;
+    overlayPanelClass?: string | string[];
     typeaheadDebounceInterval?: number;
 }