@angular/material
Version:
Angular Material
66 lines • 10.5 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/**
* Class that tracks the error state of a component.
* @docs-private
*/
export class _ErrorStateTracker {
constructor(_defaultMatcher, ngControl, _parentFormGroup, _parentForm, _stateChanges) {
this._defaultMatcher = _defaultMatcher;
this.ngControl = ngControl;
this._parentFormGroup = _parentFormGroup;
this._parentForm = _parentForm;
this._stateChanges = _stateChanges;
/** Whether the tracker is currently in an error state. */
this.errorState = false;
}
/** Updates the error state based on the provided error state matcher. */
updateErrorState() {
const oldState = this.errorState;
const parent = this._parentFormGroup || this._parentForm;
const matcher = this.matcher || this._defaultMatcher;
const control = this.ngControl ? this.ngControl.control : null;
const newState = matcher?.isErrorState(control, parent) ?? false;
if (newState !== oldState) {
this.errorState = newState;
this._stateChanges.next();
}
}
}
export function mixinErrorState(base) {
return class extends base {
/** Whether the component is in an error state. */
get errorState() {
return this._getTracker().errorState;
}
set errorState(value) {
this._getTracker().errorState = value;
}
/** An object used to control the error state of the component. */
get errorStateMatcher() {
return this._getTracker().matcher;
}
set errorStateMatcher(value) {
this._getTracker().matcher = value;
}
/** Updates the error state based on the provided error state matcher. */
updateErrorState() {
this._getTracker().updateErrorState();
}
_getTracker() {
if (!this._tracker) {
this._tracker = new _ErrorStateTracker(this._defaultErrorStateMatcher, this.ngControl, this._parentFormGroup, this._parentForm, this.stateChanges);
}
return this._tracker;
}
constructor(...args) {
super(...args);
}
};
}
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Since\n  // this mixin is commonly used with custom form-field controls, we respect the\n  // properties (also with the public name they need according to `MatFormFieldControl`).\n  ngControl: NgControl;\n  stateChanges: Subject<void>;\n}\n\n/**\n * Class that tracks the error state of a component.\n * @docs-private\n */\nexport class _ErrorStateTracker {\n  /** Whether the tracker is currently in an error state. */\n  errorState = false;\n\n  /** User-defined matcher for the error state. */\n  matcher: ErrorStateMatcher;\n\n  constructor(\n    private _defaultMatcher: ErrorStateMatcher | null,\n    public ngControl: NgControl | null,\n    private _parentFormGroup: FormGroupDirective | null,\n    private _parentForm: NgForm | null,\n    private _stateChanges: Subject<void>,\n  ) {}\n\n  /** Updates the error state based on the provided error state matcher. */\n  updateErrorState() {\n    const oldState = this.errorState;\n    const parent = this._parentFormGroup || this._parentForm;\n    const matcher = this.matcher || this._defaultMatcher;\n    const control = this.ngControl ? (this.ngControl.control as AbstractControl) : null;\n    const newState = matcher?.isErrorState(control, parent) ?? false;\n\n    if (newState !== oldState) {\n      this.errorState = newState;\n      this._stateChanges.next();\n    }\n  }\n}\n\n/**\n * Mixin to augment a directive with updateErrorState method.\n * For component with `errorState` and need to update `errorState`.\n */\nexport function mixinErrorState<T extends AbstractConstructor<HasErrorState>>(\n  base: T,\n): CanUpdateErrorStateCtor & T;\nexport function mixinErrorState<T extends Constructor<HasErrorState>>(\n  base: T,\n): CanUpdateErrorStateCtor & T {\n  return class extends base {\n    private _tracker: _ErrorStateTracker | undefined;\n\n    /** Whether the component is in an error state. */\n    get errorState() {\n      return this._getTracker().errorState;\n    }\n    set errorState(value: boolean) {\n      this._getTracker().errorState = value;\n    }\n\n    /** An object used to control the error state of the component. */\n    get errorStateMatcher() {\n      return this._getTracker().matcher;\n    }\n    set errorStateMatcher(value: ErrorStateMatcher) {\n      this._getTracker().matcher = value;\n    }\n\n    /** Updates the error state based on the provided error state matcher. */\n    updateErrorState() {\n      this._getTracker().updateErrorState();\n    }\n\n    private _getTracker() {\n      if (!this._tracker) {\n        this._tracker = new _ErrorStateTracker(\n          this._defaultErrorStateMatcher,\n          this.ngControl,\n          this._parentFormGroup,\n          this._parentForm,\n          this.stateChanges,\n        );\n      }\n\n      return this._tracker;\n    }\n\n    constructor(...args: any[]) {\n      super(...args);\n    }\n  };\n}\n"]}