feat(material/form-field): add color to default options (#24438)

closes #24438

Author: lekhmanrus

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

@@ -69,9 +69,18 @@ export type SubscriptSizing = 'fixed' | 'dynamic';
  * using the `MAT_FORM_FIELD_DEFAULT_OPTIONS` injection token.
  */
 export interface MatFormFieldDefaultOptions {
+  /** Default form field appearance style. */
   appearance?: MatFormFieldAppearance;
+  /** Default color of the form field. */
+  color?: ThemePalette;
+  /** Whether the required marker should be hidden by default. */
   hideRequiredMarker?: boolean;
+  /**
+   * Whether the label for form fields should by default float `always`,
+   * `never`, or `auto` (only when necessary).
+   */
   floatLabel?: FloatLabelType;
+  /** Whether the form field should reserve space for one line by default. */
   subscriptSizing?: SubscriptSizing;
 }
 
@@ -85,10 +94,13 @@ export const MAT_FORM_FIELD_DEFAULT_OPTIONS = new InjectionToken<MatFormFieldDef
 
 let nextUniqueId = 0;
 
-/** Default appearance used by the form-field. */
+/** Default appearance used by the form field. */
 const DEFAULT_APPEARANCE: MatFormFieldAppearance = 'fill';
 
-/** Default appearance used by the form-field. */
+/**
+ * Whether the label for form fields should by default float `always`,
+ * `never`, or `auto`.
+ */
 const DEFAULT_FLOAT_LABEL: FloatLabelType = 'auto';
 
 /** Default way that the subscript element height is set. */
@@ -147,7 +159,7 @@ const WRAPPER_HORIZONTAL_PADDING = 16;
   providers: [{provide: MAT_FORM_FIELD, useExisting: MatFormField}],
 })
 export class MatFormField
-  implements AfterViewInit, OnDestroy, AfterContentChecked, AfterContentInit
+  implements AfterContentInit, AfterContentChecked, AfterViewInit, OnDestroy
 {
   @ViewChild('textField') _textField: ElementRef<HTMLElement>;
   @ViewChild('iconPrefixContainer') _iconPrefixContainer: ElementRef<HTMLElement>;
@@ -172,10 +184,17 @@ export class MatFormField
   set hideRequiredMarker(value: BooleanInput) {
     this._hideRequiredMarker = coerceBooleanProperty(value);
   }
-  private _hideRequiredMarker: boolean;
+  private _hideRequiredMarker = false;
 
-  /** The color palette for the form-field. */
-  @Input() color: ThemePalette = 'primary';
+  /** The color palette for the form field. */
+  @Input()
+  get color(): ThemePalette {
+    return this._color;
+  }
+  set color(value: ThemePalette) {
+    this._color = value || this._defaults?.color || 'primary';
+  }
+  private _color: ThemePalette = 'primary';
 
   /** Whether the label should always float or float as the user types. */
   @Input()
@@ -185,23 +204,23 @@ export class MatFormField
   set floatLabel(value: FloatLabelType) {
     if (value !== this._floatLabel) {
       this._floatLabel = value;
-      // For backwards compatibility. Custom form-field controls or directives might set
-      // the "floatLabel" input and expect the form-field view to be updated automatically.
+      // For backwards compatibility. Custom form field controls or directives might set
+      // the "floatLabel" input and expect the form field view to be updated automatically.
       // e.g. autocomplete trigger. Ideally we'd get rid of this and the consumers would just
       // emit the "stateChanges" observable. TODO(devversion): consider removing.
       this._changeDetectorRef.markForCheck();
     }
   }
   private _floatLabel: FloatLabelType;
 
-  /** The form-field appearance style. */
+  /** The form field appearance style. */
   @Input()
   get appearance(): MatFormFieldAppearance {
     return this._appearance;
   }
   set appearance(value: MatFormFieldAppearance) {
     const oldValue = this._appearance;
-    this._appearance = value || (this._defaults && this._defaults.appearance) || DEFAULT_APPEARANCE;
+    this._appearance = value || this._defaults?.appearance || DEFAULT_APPEARANCE;
     if (this._appearance === 'outline' && this._appearance !== oldValue) {
       this._refreshOutlineNotchWidth();
 
@@ -280,7 +299,7 @@ export class MatFormField
     // MDC text-field will call this method on focus, blur and value change. It expects us
     // to update the floating label state accordingly. Though we make this a noop because we
     // want to react to floating label state changes through change detection. Relying on this
-    // adapter method would mean that the label would not update if the custom form-field control
+    // adapter method would mean that the label would not update if the custom form field control
     // sets "shouldLabelFloat" to true, or if the "floatLabel" input binding changes to "always".
     floatLabel: () => {},
 
@@ -294,7 +313,7 @@ export class MatFormField
     // closed. This works fine in the standard MDC text-field, but not in Angular where the
     // floating label could change through interpolation. We want to be able to update the
     // notched outline whenever the label content changes. Additionally, relying on focus or
-    // blur to open and close the notch does not work for us since abstract form-field controls
+    // blur to open and close the notch does not work for us since abstract form field controls
     // have the ability to control the floating label state (i.e. `shouldLabelFloat`), and we
     // want to update the notch whenever the `_shouldLabelFloat()` value changes.
     getLabelWidth: () => 0,
@@ -312,28 +331,28 @@ export class MatFormField
 
     // The foundation tries to register events on the input. This is not matching
     // our concept of abstract form field controls. We handle each event manually
-    // in "stateChanges" based on the form-field control state. The following events
+    // in "stateChanges" based on the form field control state. The following events
     // need to be handled: focus, blur. We do not handle the "input" event since
     // that one is only needed for the text-field character count, which we do
-    // not implement as part of the form-field, but should be implemented manually
+    // not implement as part of the form field, but should be implemented manually
     // by consumers using template bindings.
     registerInputInteractionHandler: () => {},
     deregisterInputInteractionHandler: () => {},
 
     // We do not have a reference to the native input since we work with abstract form field
     // controls. MDC needs a reference to the native input optionally to handle character
     // counting and value updating. These are both things we do not handle from within the
-    // form-field, so we can just return null.
+    // form field, so we can just return null.
     getNativeInput: () => null,
 
     // This method will never be called since we do not have the ability to add event listeners
     // to the native input. This is because the form control is not necessarily an input, and
     // the form field deals with abstract form controls of any type.
     setLineRippleTransformOrigin: () => {},
 
-    // The foundation tries to register click and keyboard events on the form-field to figure out
+    // The foundation tries to register click and keyboard events on the form field to figure out
     // if the input value changes through user interaction. Based on that, the foundation tries
-    // to focus the input. Since we do not handle the input value as part of the form-field, nor
+    // to focus the input. Since we do not handle the input value as part of the form field, nor
     // it's guaranteed to be an input (see adapter methods above), this is a noop.
     deregisterTextFieldInteractionHandler: () => {},
     registerTextFieldInteractionHandler: () => {},
@@ -363,19 +382,20 @@ export class MatFormField
     @Optional() @Inject(ANIMATION_MODULE_TYPE) public _animationMode?: string,
     @Inject(DOCUMENT) private _document?: any,
   ) {
-    if (_defaults && _defaults.appearance) {
-      this.appearance = _defaults.appearance;
+    if (_defaults) {
+      if (_defaults.appearance) {
+        this.appearance = _defaults.appearance;
+      }
+      this._hideRequiredMarker = Boolean(_defaults?.hideRequiredMarker);
     }
-
-    this._hideRequiredMarker = _defaults?.hideRequiredMarker ?? false;
   }
 
   ngAfterViewInit() {
     this._foundation = new MDCTextFieldFoundation(this._adapter);
 
     // MDC uses the "shouldFloat" getter to know whether the label is currently floating. This
     // does not match our implementation of when the label floats because we support more cases.
-    // For example, consumers can set "@Input floatLabel" to always, or the custom form-field
+    // For example, consumers can set "@Input floatLabel" to always, or the custom form field
     // control can set "MatFormFieldControl#shouldLabelFloat" to true. To ensure that MDC knows
     // when the label is floating, we overwrite the property to be based on the method we use to
     // determine the current state of the floating label.
@@ -386,11 +406,11 @@ export class MatFormField
     // By default, the foundation determines the validity of the text-field from the
     // specified native input. Since we don't pass a native input to the foundation because
     // abstract form controls are not necessarily consisting of an input, we handle the
-    // text-field validity through the abstract form-field control state.
+    // text-field validity through the abstract form field control state.
     this._foundation.isValid = () => !this._control.errorState;
 
     // Initial focus state sync. This happens rarely, but we want to account for
-    // it in case the form-field control has "focused" set to true on init.
+    // it in case the form field control has "focused" set to true on init.
     this._updateFocusState();
     // Initial notch width update. This is needed in case the text-field label floats
     // on initialization, and renders inside of the notched outline.
@@ -442,7 +462,7 @@ export class MatFormField
   }
 
   /**
-   * Gets an ElementRef for the element that a overlay attached to the form-field
+   * Gets an ElementRef for the element that a overlay attached to the form field
    * should be positioned relative to.
    */
   getConnectedOverlayOrigin(): ElementRef {
@@ -451,20 +471,20 @@ export class MatFormField
 
   /** Animates the placeholder up and locks it in position. */
   _animateAndLockLabel(): void {
-    // This is for backwards compatibility only. Consumers of the form-field might use
+    // This is for backwards compatibility only. Consumers of the form field might use
     // this method. e.g. the autocomplete trigger. This method has been added to the non-MDC
-    // form-field because setting "floatLabel" to "always" caused the label to float without
+    // form field because setting "floatLabel" to "always" caused the label to float without
     // animation. This is different in MDC where the label always animates, so this method
     // is no longer necessary. There doesn't seem any benefit in adding logic to allow changing
     // the floating label state without animations. The non-MDC implementation was inconsistent
     // because it always animates if "floatLabel" is set away from "always".
-    // TODO(devversion): consider removing this method when releasing the MDC form-field.
+    // TODO(devversion): consider removing this method when releasing the MDC form field.
     if (this._hasFloatingLabel()) {
       this.floatLabel = 'always';
     }
   }
 
-  /** Initializes the registered form-field control. */
+  /** Initializes the registered form field control. */
   private _initializeControl() {
     const control = this._control;
 
@@ -499,7 +519,7 @@ export class MatFormField
   /** Initializes the prefix and suffix containers. */
   private _initializePrefixAndSuffix() {
     this._checkPrefixAndSuffixTypes();
-    // Mark the form-field as dirty whenever the prefix or suffix children change. This
+    // Mark the form field as dirty whenever the prefix or suffix children change. This
     // is necessary because we conditionally display the prefix/suffix containers based
     // on whether there is projected content.
     merge(this._prefixChildren.changes, this._suffixChildren.changes).subscribe(() => {
@@ -510,7 +530,7 @@ export class MatFormField
 
   /**
    * Initializes the subscript by validating hints and synchronizing "aria-describedby" ids
-   * with the custom form-field control. Also subscribes to hint and error changes in order
+   * with the custom form field control. Also subscribes to hint and error changes in order
    * to be able to validate and synchronize ids on change.
    */
   private _initializeSubscript() {
@@ -541,9 +561,9 @@ export class MatFormField
   private _updateFocusState() {
     // Usually the MDC foundation would call "activateFocus" and "deactivateFocus" whenever
     // certain DOM events are emitted. This is not possible in our implementation of the
-    // form-field because we support abstract form field controls which are not necessarily
-    // of type input, nor do we have a reference to a native form-field control element. Instead
-    // we handle the focus by checking if the abstract form-field control focused state changes.
+    // form field because we support abstract form field controls which are not necessarily
+    // of type input, nor do we have a reference to a native form field control element. Instead
+    // we handle the focus by checking if the abstract form field control focused state changes.
     if (this._control.focused && !this._isFocused) {
       this._isFocused = true;
       this._foundation.activateFocus();
@@ -556,7 +576,7 @@ export class MatFormField
   /**
    * The floating label in the docked state needs to account for prefixes. The horizontal offset
    * is calculated whenever the appearance changes to `outline`, the prefixes change, or when the
-   * form-field is added to the DOM. This method sets up all subscriptions which are needed to
+   * form field is added to the DOM. This method sets up all subscriptions which are needed to
    * trigger the label offset update. In general, we want to avoid performing measurements often,
    * so we rely on the `NgZone` as indicator when the offset should be recalculated, instead of
    * checking every change detection cycle.
@@ -595,7 +615,7 @@ export class MatFormField
   /**
    * Whether the label should display in the infix. Labels in the outline appearance are
    * displayed as part of the notched-outline and are horizontally offset to account for
-   * form-field prefix content. This won't work in server side rendering since we cannot
+   * form field prefix content. This won't work in server side rendering since we cannot
    * measure the width of the prefix container. To make the docked label appear as if the
    * right offset has been calculated, we forcibly render the label inside the infix. Since
    * the label is part of the infix, the label cannot overflow the prefix content.
@@ -729,7 +749,7 @@ export class MatFormField
       floatingLabel.style.transform = '';
       return;
     }
-    // If the form-field is not attached to the DOM yet (e.g. in a tab), we defer
+    // If the form field is not attached to the DOM yet (e.g. in a tab), we defer
     // the label offset update until the zone stabilizes.
     if (!this._isAttachedToDom()) {
       this._needsOutlineLabelOffsetUpdateOnStable = true;

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

@@ -1405,6 +1405,18 @@ describe('MatFormField default options', () => {
     expect(fixture.componentInstance.formField.appearance).toBe('outline');
   });
 
+  it('should be able to change the default color', () => {
+    const fixture = createComponent(MatInputWithColor, [
+      {
+        provide: MAT_FORM_FIELD_DEFAULT_OPTIONS,
+        useValue: {color: 'accent'},
+      },
+    ]);
+    fixture.detectChanges();
+    const formField = fixture.nativeElement.querySelector('.mat-mdc-form-field');
+    expect(formField.classList).toContain('mat-accent');
+  });
+
   it('defaults subscriptSizing to false', () => {
     const fixture = createComponent(MatInputWithSubscriptSizing);
     fixture.detectChanges();

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

@@ -28,7 +28,7 @@ import {
   ViewEncapsulation,
   OnDestroy,
 } from '@angular/core';
-import {CanColor, mixinColor} from '@angular/material/core';
+import {CanColor, mixinColor, ThemePalette} from '@angular/material/core';
 import {fromEvent, merge, Subject} from 'rxjs';
 import {startWith, take, takeUntil} from 'rxjs/operators';
 import {MAT_ERROR, MatError} from './error';
@@ -66,18 +66,22 @@ const _MatFormFieldBase = mixinColor(
 /** Possible appearance styles for the form field. */
 export type MatFormFieldAppearance = 'legacy' | 'standard' | 'fill' | 'outline';
 
-/** Possible values for the "floatLabel" form-field input. */
+/** Possible values for the "floatLabel" form field input. */
 export type FloatLabelType = 'always' | 'never' | 'auto';
 
 /**
  * Represents the default options for the form field that can be configured
  * using the `MAT_FORM_FIELD_DEFAULT_OPTIONS` injection token.
  */
 export interface MatFormFieldDefaultOptions {
+  /** Default form field appearance style. */
   appearance?: MatFormFieldAppearance;
+  /** Default color of the form field. */
+  color?: ThemePalette;
+  /** Whether the required marker should be hidden by default. */
   hideRequiredMarker?: boolean;
   /**
-   * Whether the label for form-fields should by default float `always`,
+   * Whether the label for form fields should by default float `always`,
    * `never`, or `auto` (only when necessary).
    */
   floatLabel?: FloatLabelType;
@@ -158,15 +162,15 @@ export class MatFormField
 
   private readonly _destroyed = new Subject<void>();
 
-  /** The form-field appearance style. */
+  /** The form field appearance style. */
   @Input()
   get appearance(): MatFormFieldAppearance {
     return this._appearance;
   }
   set appearance(value: MatFormFieldAppearance) {
     const oldValue = this._appearance;
 
-    this._appearance = value || (this._defaults && this._defaults.appearance) || 'legacy';
+    this._appearance = value || this._defaults?.appearance || 'legacy';
 
     if (this._appearance === 'outline' && oldValue !== value) {
       this._outlineGapCalculationNeededOnStable = true;
@@ -182,7 +186,7 @@ export class MatFormField
   set hideRequiredMarker(value: BooleanInput) {
     this._hideRequiredMarker = coerceBooleanProperty(value);
   }
-  private _hideRequiredMarker: boolean;
+  private _hideRequiredMarker = false;
 
   /** Override for the logic that disables the label animation in certain cases. */
   private _showAlwaysAnimate = false;
@@ -282,9 +286,13 @@ export class MatFormField
     this._animationsEnabled = _animationMode !== 'NoopAnimations';
 
     // Set the default through here so we invoke the setter on the first run.
-    this.appearance = _defaults && _defaults.appearance ? _defaults.appearance : 'legacy';
-    this._hideRequiredMarker =
-      _defaults && _defaults.hideRequiredMarker != null ? _defaults.hideRequiredMarker : false;
+    this.appearance = _defaults?.appearance || 'legacy';
+    if (_defaults) {
+      this._hideRequiredMarker = Boolean(_defaults.hideRequiredMarker);
+      if (_defaults.color) {
+        this.color = this.defaultColor = _defaults.color;
+      }
+    }
   }
 
   /**
@@ -295,7 +303,7 @@ export class MatFormField
   }
 
   /**
-   * Gets an ElementRef for the element that a overlay attached to the form-field should be
+   * Gets an ElementRef for the element that a overlay attached to the form field should be
    * positioned relative to.
    */
   getConnectedOverlayOrigin(): ElementRef {