feat: custom model selector

src/lib/utils/transitions/index.ts

@@ -0,0 +1,48 @@
+import { cubicOut } from 'svelte/easing';
+import type { TransitionConfig } from 'svelte/transition';
+
+type FlyAndScaleParams = {
+	y?: number;
+	start?: number;
+	duration?: number;
+};
+
+const defaultFlyAndScaleParams = { y: -8, start: 0.95, duration: 200 };
+
+export const flyAndScale = (node: Element, params?: FlyAndScaleParams): TransitionConfig => {
+	const style = getComputedStyle(node);
+	const transform = style.transform === 'none' ? '' : style.transform;
+	const withDefaults = { ...defaultFlyAndScaleParams, ...params };
+
+	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: withDefaults.duration ?? 200,
+		delay: 0,
+		css: (t) => {
+			const y = scaleConversion(t, [0, 1], [withDefaults.y, 0]);
+			const scale = scaleConversion(t, [0, 1], [withDefaults.start, 1]);
+
+			return styleToString({
+				transform: `${transform} translate3d(0, ${y}px, 0) scale(${scale})`,
+				opacity: t
+			});
+		},
+		easing: cubicOut
+	};
+};