101 lines
3.1 KiB
TypeScript
101 lines
3.1 KiB
TypeScript
/**
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* @license
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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export class GrAttributeHelper {
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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private readonly _promises = new Map<string, Promise<any>>();
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// TODO(TS): Change any to something more like HTMLElement.
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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constructor(public element: any) {}
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_getChangedEventName(name: string): string {
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return name.replace(/([a-z])([A-Z])/g, '$1-$2').toLowerCase() + '-changed';
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}
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/**
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* Returns true if the property is defined on wrapped element.
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*/
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_elementHasProperty(name: string) {
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return this.element[name] !== undefined;
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}
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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_reportValue(callback: (value: any) => void, value: any) {
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try {
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callback(value);
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} catch (e) {
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console.info(e);
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}
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}
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/**
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* Binds callback to property updates.
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*
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* @param name Property name.
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* @return Unbind function.
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*/
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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bind(name: string, callback: (value: any) => void) {
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const attributeChangedEventName = this._getChangedEventName(name);
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const changedHandler = (e: CustomEvent) =>
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this._reportValue(callback, e.detail.value);
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const unbind = () =>
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this.element.removeEventListener(
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attributeChangedEventName,
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changedHandler
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);
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this.element.addEventListener(attributeChangedEventName, changedHandler);
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if (this._elementHasProperty(name)) {
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this._reportValue(callback, this.element[name]);
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}
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return unbind;
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}
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/**
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* Get value of the property from wrapped object. Waits for the property
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* to be initialized if it isn't defined.
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*/
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get(name: string): Promise<unknown> {
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if (this._elementHasProperty(name)) {
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return Promise.resolve(this.element[name]);
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}
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if (!this._promises.has(name)) {
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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let resolve: (value: any) => void;
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const promise = new Promise(r => (resolve = r));
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const unbind = this.bind(name, value => {
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resolve(value);
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unbind();
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});
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this._promises.set(name, promise);
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}
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return this._promises.get(name)!;
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}
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/**
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* Sets value and dispatches event to force notify.
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*/
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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set(name: string, value: any) {
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this.element[name] = value;
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this.element.dispatchEvent(
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new CustomEvent(this._getChangedEventName(name), {detail: {value}})
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);
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}
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}
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