1 files changed, 56 insertions, 0 deletions
diff --git a/code/frontend/src/utils/ui.ts b/code/frontend/src/utils/ui.ts
new file mode 100644
index 0000000..019b8f6
--- /dev/null
+++ b/code/frontend/src/utils/ui.ts
@@ -0,0 +1,56 @@
+import { type ClassValue, clsx } from 'clsx'
+import { cubicOut } from 'svelte/easing'
+import { twMerge } from 'tailwind-merge'
+import type { TransitionConfig } from 'svelte/transition'
+
+export function cn(...inputs: ClassValue[]) {
+	return twMerge(clsx(inputs))
+}
+
+type FlyAndScaleParams = {
+	y?: number
+	x?: number
+	start?: number
+	duration?: number
+}
+
+export function flyAndScale(
+	node: Element,
+	params: FlyAndScaleParams = { y: -8, x: 0, start: 0.95, duration: 150 }
+): TransitionConfig {
+	const style = getComputedStyle(node)
+	const transform = style.transform === 'none' ? '' : style.transform
+
+	const scaleConversion = (valueA: number, scaleA: [number, number], scaleB: [number, number]) => {
+		const [minA, maxA] = scaleA
+		const [minB, maxB] = scaleB
+
+		const percentage = (valueA - minA) / (maxA - minA)
+		const valueB = percentage * (maxB - minB) + minB
+
+		return valueB
+	}
+
+	const styleToString = (style: Record<string, number | string | undefined>): string => {
+		return Object.keys(style).reduce((str, key) => {
+			if (style[key] === undefined) return str
+			return str + `${key}:${style[key]};`
+		}, '')
+	}
+
+	return {
+		duration: params.duration ?? 200,
+		delay: 0,
+		css: (t) => {
+			const y = scaleConversion(t, [0, 1], [params.y ?? 5, 0])
+			const x = scaleConversion(t, [0, 1], [params.x ?? 0, 0])
+			const scale = scaleConversion(t, [0, 1], [params.start ?? 0.95, 1])
+
+			return styleToString({
+				transform: `${transform} translate3d(${x}px, ${y}px, 0) scale(${scale})`,
+				opacity: t
+			})
+		},
+		easing: cubicOut
+	}
+}