/**
 * @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
 */
import { Directive, forwardRef } from '@angular/core';
import { BuiltInControlValueAccessor, NG_VALUE_ACCESSOR } from './control_value_accessor';
import * as i0 from "@angular/core";
export const NUMBER_VALUE_ACCESSOR = {
    provide: NG_VALUE_ACCESSOR,
    useExisting: forwardRef(() => NumberValueAccessor),
    multi: true
};
/**
 * @description
 * The `ControlValueAccessor` for writing a number value and listening to number input changes.
 * The value accessor is used by the `FormControlDirective`, `FormControlName`, and `NgModel`
 * directives.
 *
 * @usageNotes
 *
 * ### Using a number input with a reactive form.
 *
 * The following example shows how to use a number input with a reactive form.
 *
 * ```ts
 * const totalCountControl = new FormControl();
 * ```
 *
 * ```
 * <input type="number" [formControl]="totalCountControl">
 * ```
 *
 * @ngModule ReactiveFormsModule
 * @ngModule FormsModule
 * @publicApi
 */
export class NumberValueAccessor extends BuiltInControlValueAccessor {
    /**
     * Sets the "value" property on the input element.
     * @nodoc
     */
    writeValue(value) {
        // The value needs to be normalized for IE9, otherwise it is set to 'null' when null
        const normalizedValue = value == null ? '' : value;
        this.setProperty('value', normalizedValue);
    }
    /**
     * Registers a function called when the control value changes.
     * @nodoc
     */
    registerOnChange(fn) {
        this.onChange = (value) => {
            fn(value == '' ? null : parseFloat(value));
        };
    }
}
NumberValueAccessor.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "14.3.0", ngImport: i0, type: NumberValueAccessor, deps: null, target: i0.ɵɵFactoryTarget.Directive });
NumberValueAccessor.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "14.3.0", type: NumberValueAccessor, selector: "input[type=number][formControlName],input[type=number][formControl],input[type=number][ngModel]", host: { listeners: { "input": "onChange($event.target.value)", "blur": "onTouched()" } }, providers: [NUMBER_VALUE_ACCESSOR], usesInheritance: true, ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "14.3.0", ngImport: i0, type: NumberValueAccessor, decorators: [{
            type: Directive,
            args: [{
                    selector: 'input[type=number][formControlName],input[type=number][formControl],input[type=number][ngModel]',
                    host: { '(input)': 'onChange($event.target.value)', '(blur)': 'onTouched()' },
                    providers: [NUMBER_VALUE_ACCESSOR]
                }]
        }] });
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