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84 lines
2.0 KiB
84 lines
2.0 KiB
import {theme} from 'app/client/ui2018/cssVars';
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import {DomArg, keyframes, Observable, observable, styled} from 'grainjs';
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const rotate360 = keyframes(`
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from { transform: rotate(45deg); }
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75% { transform: rotate(405deg); }
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to { transform: rotate(405deg); }
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`);
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const flash = keyframes(`
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0% {
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background-color: ${theme.loaderFg};
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}
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50%, 100% {
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background-color: ${theme.loaderBg};
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}
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`);
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/**
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* Creates a 32x32 pixel loading spinner. Use by calling `loadingSpinner()`.
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*/
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export const loadingSpinner = styled('div', `
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display: inline-block;
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box-sizing: border-box;
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width: 32px;
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height: 32px;
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border-radius: 32px;
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border: 4px solid ${theme.loaderBg};
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border-top-color: ${theme.loaderFg};
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animation: ${rotate360} 1s ease-out infinite;
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`);
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/**
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* Creates a three-dots loading animation. Use by calling `loadingDots()`.
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*/
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export function loadingDots(...args: DomArg<HTMLDivElement>[]) {
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return cssLoadingDotsContainer(
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cssLoadingDot(cssLoadingDot.cls('-left')),
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cssLoadingDot(cssLoadingDot.cls('-middle')),
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cssLoadingDot(cssLoadingDot.cls('-right')),
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...args,
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);
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}
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export function watchPromise<T extends (...args: any[]) => any>(fun: T): T & {busy: Observable<boolean>} {
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const loading = observable(false);
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const result = async (...args: any) => {
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loading.set(true);
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try {
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return await fun(...args);
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} finally {
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if (!loading.isDisposed()) {
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loading.set(false);
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}
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}
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};
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return Object.assign(result, {busy: loading}) as any;
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}
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const cssLoadingDotsContainer = styled('div', `
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--dot-size: 10px;
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display: inline-flex;
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column-gap: calc(var(--dot-size) / 2);
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`);
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const cssLoadingDot = styled('div', `
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border-radius: 50%;
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width: var(--dot-size);
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height: var(--dot-size);
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background-color: ${theme.loaderFg};
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color: ${theme.loaderFg};
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animation: ${flash} 1s alternate infinite;
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&-left {
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animation-delay: 0s;
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}
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&-middle {
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animation-delay: 0.25s;
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}
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&-right {
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animation-delay: 0.5s;
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}
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`);
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