Icard/angular-clarity-master(work.../node_modules/lit-html/directives/ref.d.ts

66 lines
2.2 KiB
TypeScript

/**
* @license
* Copyright 2020 Google LLC
* SPDX-License-Identifier: BSD-3-Clause
*/
import { ElementPart } from '../lit-html.js';
import { AsyncDirective } from '../async-directive.js';
/**
* Creates a new Ref object, which is container for a reference to an element.
*/
export declare const createRef: <T = Element>() => Ref<T>;
/**
* An object that holds a ref value.
*/
declare class Ref<T = Element> {
/**
* The current Element value of the ref, or else `undefined` if the ref is no
* longer rendered.
*/
readonly value?: T;
}
export type { Ref };
export type RefOrCallback<T = Element> = Ref<T> | ((el: T | undefined) => void);
declare class RefDirective extends AsyncDirective {
private _element?;
private _ref?;
private _context?;
render(_ref?: RefOrCallback): symbol;
update(part: ElementPart, [ref]: Parameters<this['render']>): symbol;
private _updateRefValue;
private get _lastElementForRef();
disconnected(): void;
reconnected(): void;
}
/**
* Sets the value of a Ref object or calls a ref callback with the element it's
* bound to.
*
* A Ref object acts as a container for a reference to an element. A ref
* callback is a function that takes an element as its only argument.
*
* The ref directive sets the value of the Ref object or calls the ref callback
* during rendering, if the referenced element changed.
*
* Note: If a ref callback is rendered to a different element position or is
* removed in a subsequent render, it will first be called with `undefined`,
* followed by another call with the new element it was rendered to (if any).
*
* ```js
* // Using Ref object
* const inputRef = createRef();
* render(html`<input ${ref(inputRef)}>`, container);
* inputRef.value.focus();
*
* // Using callback
* const callback = (inputElement) => inputElement.focus();
* render(html`<input ${ref(callback)}>`, container);
* ```
*/
export declare const ref: (_ref?: RefOrCallback<Element> | undefined) => import("../directive.js").DirectiveResult<typeof RefDirective>;
/**
* The type of the class that powers this directive. Necessary for naming the
* directive's return type.
*/
export type { RefDirective };
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