flotilla/src/lib/transition.ts

// @ts-nocheck
import {cubicOut} from 'svelte/easing'
import type {FlyParams} from "svelte/transition"
import {fly as baseFly} from "svelte/transition"

export {fade, slide} from "svelte/transition"

export const fly = (node: Element, params?: FlyParams | undefined) =>
  baseFly(node, {y: 20, ...params})

// Copy-pasted and tweaked from slide source code
export function slideAndFade(node: any, { delay = 0, duration = 400, easing = cubicOut, axis = 'y' } = {}) {
	const style = getComputedStyle(node)
	const opacity = +style.opacity
	const primary_property = axis === 'y' ? 'height' : 'width'
	const primary_property_value = parseFloat(style[primary_property])
	const secondary_properties = axis === 'y' ? ['top', 'bottom'] : ['left', 'right']
	const capitalized_secondary_properties = secondary_properties.map(
		(e: string) => `${e[0].toUpperCase()}${e.slice(1)}`
	)
	const padding_start_value = parseFloat(style[`padding${capitalized_secondary_properties[0]}`])
	const padding_end_value = parseFloat(style[`padding${capitalized_secondary_properties[1]}`])
	const margin_start_value = parseFloat(style[`margin${capitalized_secondary_properties[0]}`])
	const margin_end_value = parseFloat(style[`margin${capitalized_secondary_properties[1]}`])
	const border_width_start_value = parseFloat(
		style[`border${capitalized_secondary_properties[0]}Width`]
	)
	const border_width_end_value = parseFloat(
		style[`border${capitalized_secondary_properties[1]}Width`]
	)
	return {
		delay,
		duration,
		easing,
		css: (t: number) =>
			'overflow: hidden;' +
			`opacity: ${t};` +
			`${primary_property}: ${t * primary_property_value}px;` +
			`padding-${secondary_properties[0]}: ${t * padding_start_value}px;` +
			`padding-${secondary_properties[1]}: ${t * padding_end_value}px;` +
			`margin-${secondary_properties[0]}: ${t * margin_start_value}px;` +
			`margin-${secondary_properties[1]}: ${t * margin_end_value}px;` +
			`border-${secondary_properties[0]}-width: ${t * border_width_start_value}px;` +
			`border-${secondary_properties[1]}-width: ${t * border_width_end_value}px;`
	}
}