forked from Archives/Athou_commafeed
48 lines
1.8 KiB
TypeScript
48 lines
1.8 KiB
TypeScript
import { throttle } from "throttle-debounce"
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import { Category } from "./types"
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export function visitCategoryTree(category: Category, visitor: (category: Category) => void): void {
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visitor(category)
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category.children.forEach(child => visitCategoryTree(child, visitor))
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}
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export function flattenCategoryTree(category: Category): Category[] {
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const categories: Category[] = []
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visitCategoryTree(category, c => categories.push(c))
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return categories
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}
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export function categoryUnreadCount(category?: Category): number {
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if (!category) return 0
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return flattenCategoryTree(category)
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.flatMap(c => c.feeds)
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.map(f => f.unread)
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.reduce((total, current) => total + current, 0)
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}
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export const calculatePlaceholderSize = ({ width, height, maxWidth }: { width?: number; height?: number; maxWidth: number }) => {
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const placeholderWidth = width && Math.min(width, maxWidth)
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const placeholderHeight = height && width && width > maxWidth ? height * (maxWidth / width) : height
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return { width: placeholderWidth, height: placeholderHeight }
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}
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export const scrollToWithCallback = ({ options, onScrollEnded }: { options: ScrollToOptions; onScrollEnded: () => void }) => {
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const offset = (options.top ?? 0).toFixed()
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const onScroll = throttle(100, () => {
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if (window.scrollY.toFixed() === offset) {
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window.removeEventListener("scroll", onScroll)
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onScrollEnded()
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}
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})
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window.addEventListener("scroll", onScroll)
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// scrollTo does not trigger if there's nothing to do, trigger it manually
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onScroll()
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window.scrollTo(options)
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}
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export const truncate = (str: string, n: number) => (str.length > n ? `${str.slice(0, n - 1)}\u2026` : str)
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