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/*
* Vencord, a modification for Discord's desktop app
* Copyright (c) 2022 Vendicated and contributors
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
import { React, useEffect, useReducer, useState } from "@webpack/common";
import { makeLazy } from "./lazy";
import { checkIntersecting } from "./misc";
/**
* Check if an element is on screen
* @param intersectOnly If `true`, will only update the state when the element comes into view
* @returns [refCallback, isIntersecting]
*/
export const useIntersection = (intersectOnly = false): [
refCallback: React.RefCallback<Element>,
isIntersecting: boolean,
] => {
const observerRef = React.useRef<IntersectionObserver | null>(null);
const [isIntersecting, setIntersecting] = useState(false);
const refCallback = (element: Element | null) => {
observerRef.current?.disconnect();
observerRef.current = null;
if (!element) return;
if (checkIntersecting(element)) {
setIntersecting(true);
if (intersectOnly) return;
}
observerRef.current = new IntersectionObserver(entries => {
for (const entry of entries) {
if (entry.target !== element) continue;
if (entry.isIntersecting && intersectOnly) {
setIntersecting(true);
observerRef.current?.disconnect();
observerRef.current = null;
} else {
setIntersecting(entry.isIntersecting);
}
}
});
observerRef.current.observe(element);
};
return [refCallback, isIntersecting];
};
type AwaiterRes<T> = [T, any, boolean];
interface AwaiterOpts<T> {
fallbackValue: T;
deps?: unknown[];
onError?(e: any): void;
onSuccess?(value: T): void;
}
/**
* Await a promise
* @param factory Factory
* @param fallbackValue The fallback value that will be used until the promise resolved
* @returns [value, error, isPending]
*/
export function useAwaiter<T>(factory: () => Promise<T>): AwaiterRes<T | null>;
export function useAwaiter<T>(factory: () => Promise<T>, providedOpts: AwaiterOpts<T>): AwaiterRes<T>;
export function useAwaiter<T>(factory: () => Promise<T>, providedOpts?: AwaiterOpts<T | null>): AwaiterRes<T | null> {
const opts: Required<AwaiterOpts<T | null>> = Object.assign({
fallbackValue: null,
deps: [],
onError: null,
}, providedOpts);
const [state, setState] = useState({
value: opts.fallbackValue,
error: null,
pending: true
});
useEffect(() => {
let isAlive = true;
if (!state.pending) setState({ ...state, pending: true });
factory()
.then(value => {
if (!isAlive) return;
setState({ value, error: null, pending: false });
opts.onSuccess?.(value);
})
.catch(error => {
if (!isAlive) return;
setState({ value: null, error, pending: false });
opts.onError?.(error);
});
return () => void (isAlive = false);
}, opts.deps);
return [state.value, state.error, state.pending];
}
/**
* Returns a function that can be used to force rerender react components
*/
export function useForceUpdater(): () => void;
export function useForceUpdater(withDep: true): [unknown, () => void];
export function useForceUpdater(withDep?: true) {
const r = useReducer(x => x + 1, 0);
return withDep ? r : r[1];
}
/**
* A lazy component. The factory method is called on first render. For example useful
* for const Component = LazyComponent(() => findByDisplayName("...").default)
* @param factory Function returning a Component
* @returns Result of factory function
*/
export function LazyComponent<T extends object = any>(factory: () => React.ComponentType<T>) {
const get = makeLazy(factory);
return (props: T) => {
const Component = get();
return <Component {...props} />;
};
}
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