105 lines
3.4 KiB
TypeScript
105 lines
3.4 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {Directive, ElementRef, Inject, InjectionToken, Optional, Renderer2, forwardRef} from '@angular/core';
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import {ɵgetDOM as getDOM} from '@angular/platform-browser';
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import {ControlValueAccessor, NG_VALUE_ACCESSOR} from './control_value_accessor';
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export const DEFAULT_VALUE_ACCESSOR: any = {
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provide: NG_VALUE_ACCESSOR,
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useExisting: forwardRef(() => DefaultValueAccessor),
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multi: true
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};
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/**
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* We must check whether the agent is Android because composition events
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* behave differently between iOS and Android.
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*/
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function _isAndroid(): boolean {
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const userAgent = getDOM() ? getDOM().getUserAgent() : '';
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return /android (\d+)/.test(userAgent.toLowerCase());
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}
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/**
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* Turn this mode on if you want form directives to buffer IME input until compositionend
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* @publicApi
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*/
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export const COMPOSITION_BUFFER_MODE = new InjectionToken<boolean>('CompositionEventMode');
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/**
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* The default accessor for writing a value and listening to changes that is used by the
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* `NgModel`, `FormControlDirective`, and `FormControlName` directives.
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*
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* @usageNotes
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* ### Example
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*
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* ```
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* <input type="text" name="searchQuery" ngModel>
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* ```
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*
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* @ngModule FormsModule
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* @ngModule ReactiveFormsModule
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*/
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@Directive({
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selector:
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'input:not([type=checkbox])[formControlName],textarea[formControlName],input:not([type=checkbox])[formControl],textarea[formControl],input:not([type=checkbox])[ngModel],textarea[ngModel],[ngDefaultControl]',
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// TODO: vsavkin replace the above selector with the one below it once
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// https://github.com/angular/angular/issues/3011 is implemented
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// selector: '[ngModel],[formControl],[formControlName]',
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host: {
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'(input)': '$any(this)._handleInput($event.target.value)',
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'(blur)': 'onTouched()',
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'(compositionstart)': '$any(this)._compositionStart()',
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'(compositionend)': '$any(this)._compositionEnd($event.target.value)'
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},
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providers: [DEFAULT_VALUE_ACCESSOR]
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})
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export class DefaultValueAccessor implements ControlValueAccessor {
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onChange = (_: any) => {};
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onTouched = () => {};
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/** Whether the user is creating a composition string (IME events). */
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private _composing = false;
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constructor(
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private _renderer: Renderer2, private _elementRef: ElementRef,
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@Optional() @Inject(COMPOSITION_BUFFER_MODE) private _compositionMode: boolean) {
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if (this._compositionMode == null) {
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this._compositionMode = !_isAndroid();
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}
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}
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writeValue(value: any): void {
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const normalizedValue = value == null ? '' : value;
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this._renderer.setProperty(this._elementRef.nativeElement, 'value', normalizedValue);
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}
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registerOnChange(fn: (_: any) => void): void { this.onChange = fn; }
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registerOnTouched(fn: () => void): void { this.onTouched = fn; }
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setDisabledState(isDisabled: boolean): void {
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this._renderer.setProperty(this._elementRef.nativeElement, 'disabled', isDisabled);
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}
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/** @internal */
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_handleInput(value: any): void {
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if (!this._compositionMode || (this._compositionMode && !this._composing)) {
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this.onChange(value);
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}
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}
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/** @internal */
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_compositionStart(): void { this._composing = true; }
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/** @internal */
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_compositionEnd(value: any): void {
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this._composing = false;
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this._compositionMode && this.onChange(value);
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}
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}
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