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polymer-change.directive.ts
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polymer-change.directive.ts
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import {
Directive,
ElementRef,
Inject,
InjectionToken,
Optional,
Renderer2,
forwardRef,
} from "@angular/core";
import { ɵgetDOM as getDOM } from "@angular/platform-browser";
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from "@angular/forms";
export const POLYMER_VALUE_ACCESSOR: any = {
provide: NG_VALUE_ACCESSOR,
useExisting: forwardRef(() => PolymerValueAccessor),
multi: true,
};
@Directive({
selector: "[polymerControl]",
host: {
"(change)": "$any(this)._handleInput($event.target.value)",
"(blur)": "onTouched()",
},
providers: [POLYMER_VALUE_ACCESSOR],
})
export class PolymerValueAccessor implements ControlValueAccessor {
onChange = (_: any) => {};
onTouched = () => {};
constructor(private _renderer: Renderer2, private _elementRef: ElementRef) {}
writeValue(value: any): void {
const normalizedValue = value == null ? "" : value;
this._renderer.setProperty(this._elementRef.nativeElement, "value", normalizedValue);
}
registerOnChange(fn: (_: any) => void): void {
this.onChange = fn;
}
registerOnTouched(fn: () => void): void {
this.onTouched = fn;
}
setDisabledState(isDisabled: boolean): void {
this._renderer.setProperty(this._elementRef.nativeElement, "disabled", isDisabled);
}
_handleInput(value: any): void {
this.onChange(value);
}
}