From e2936832349d72b1610e70ab2f1afa0432a182e8 Mon Sep 17 00:00:00 2001
From: Tomi Turtiainen <10324676+tomi@users.noreply.github.com>
Date: Fri, 14 Jun 2024 14:30:29 +0300
Subject: [PATCH] refactor: Migrate ColorCircles to composition api
 (no-changelog) (#9747)

---
 .../src/styleguide/ColorCircles.utils.ts      |  44 ++++++
 .../src/styleguide/ColorCircles.vue           | 148 ++++++------------
 2 files changed, 92 insertions(+), 100 deletions(-)
 create mode 100644 packages/design-system/src/styleguide/ColorCircles.utils.ts

diff --git a/packages/design-system/src/styleguide/ColorCircles.utils.ts b/packages/design-system/src/styleguide/ColorCircles.utils.ts
new file mode 100644
index 0000000000..f28ef6e05e
--- /dev/null
+++ b/packages/design-system/src/styleguide/ColorCircles.utils.ts
@@ -0,0 +1,44 @@
+/**
+ * Convert an HSL color to a Hex color
+ */
+export function hslToHex(h: number, s: number, l: number): string {
+	l /= 100;
+	const a = (s * Math.min(l, 1 - l)) / 100;
+	const f = (n: number) => {
+		const k = (n + h / 30) % 12;
+		const color = l - a * Math.max(Math.min(k - 3, 9 - k, 1), -1);
+		return Math.round(255 * color)
+			.toString(16)
+			.padStart(2, '0');
+	};
+	return `#${f(0)}${f(8)}${f(4)}`;
+}
+
+/**
+ * Resolve calc() expressions in HSL strings
+ */
+export function resolveHSLCalc(hslString: string): string {
+	const calcRegex = /calc\(([^)]+)\)/;
+	const matchCalc = hslString.match(calcRegex);
+	if (!matchCalc) {
+		return hslString;
+	}
+	const expression = matchCalc[1].replace(/%/g, '');
+	const evaluation: number = eval(expression);
+	const finalPercentage = `${evaluation}%`;
+	return hslString.replace(calcRegex, finalPercentage);
+}
+
+/**
+ * Get the Hex color from an HSL color string
+ */
+export function getHex(hsl: string): string {
+	hsl = resolveHSLCalc(hsl);
+	const colors = hsl
+		.replace('hsl(', '')
+		.replace(')', '')
+		.replace(/%/g, '')
+		.split(',')
+		.map(parseFloat);
+	return hslToHex(colors[0], colors[1], colors[2]);
+}
diff --git a/packages/design-system/src/styleguide/ColorCircles.vue b/packages/design-system/src/styleguide/ColorCircles.vue
index 0643883ac4..81955c319f 100644
--- a/packages/design-system/src/styleguide/ColorCircles.vue
+++ b/packages/design-system/src/styleguide/ColorCircles.vue
@@ -1,3 +1,51 @@
+<script setup lang="ts">
+import { ref, onMounted, onUnmounted, reactive } from 'vue';
+import type { PropType } from 'vue';
+import { getHex, resolveHSLCalc } from './ColorCircles.utils';
+
+const props = defineProps({
+	colors: {
+		type: Array as PropType<string[]>,
+		required: true,
+	},
+});
+
+const hsl = reactive<{ [color: string]: string }>({});
+const observer = ref<MutationObserver | null>(null);
+
+const setColors = () => {
+	for (const color of props.colors) {
+		const style = getComputedStyle(document.body);
+		hsl[color] = style.getPropertyValue(color);
+	}
+};
+
+onMounted(() => {
+	setColors();
+
+	observer.value = new MutationObserver((mutationsList) => {
+		for (const mutation of mutationsList) {
+			if (mutation.type === 'attributes') {
+				setColors();
+			}
+		}
+	});
+
+	const body = document.querySelector('body');
+	if (body) {
+		observer.value.observe(body, { attributes: true });
+	}
+});
+
+onUnmounted(() => {
+	observer.value?.disconnect();
+});
+
+// Expose functions for template usage
+const getHexValue = (color: string) => getHex(hsl[color]);
+const getHSLValue = (color: string) => resolveHSLCalc(hsl[color]);
+</script>
+
 <template>
 	<div :class="$style.section">
 		<div v-for="color in colors" :key="color" :class="$style.container">
@@ -9,106 +57,6 @@
 	</div>
 </template>
 
-<script lang="ts">
-import type { PropType } from 'vue';
-import { defineComponent } from 'vue';
-
-function hslToHex(h: number, s: number, l: number): string {
-	l /= 100;
-	const a = (s * Math.min(l, 1 - l)) / 100;
-	const f = (n: number) => {
-		const k = (n + h / 30) % 12;
-		const color = l - a * Math.max(Math.min(k - 3, 9 - k, 1), -1);
-		return Math.round(255 * color)
-			.toString(16)
-			.padStart(2, '0'); // convert to Hex and prefix "0" if needed
-	};
-	return `#${f(0)}${f(8)}${f(4)}`;
-}
-
-function resolveHSLCalc(hslString: string): string {
-	const calcRegex = /calc\(([^)]+)\)/;
-	const matchCalc = hslString.match(calcRegex);
-	if (!matchCalc) {
-		return hslString;
-	}
-	const expression = matchCalc[1];
-	const noPercentageExpression = expression.replace(/%/g, '');
-	const evaluation: number = eval(noPercentageExpression);
-	const finalPercentage = evaluation.toString() + '%';
-	const resolvedHslString = hslString.replace(calcRegex, finalPercentage);
-	return resolvedHslString;
-}
-
-function getHex(hsl: string): string {
-	hsl = resolveHSLCalc(hsl);
-	const colors = hsl
-		.replace('hsl(', '')
-		.replace(')', '')
-		.replace(/%/g, '')
-		.split(',')
-		.map((n: string) => parseFloat(n));
-
-	return hslToHex(colors[0], colors[1], colors[2]);
-}
-
-export default defineComponent({
-	name: 'ColorCircles',
-	props: {
-		colors: {
-			type: Array as PropType<string[]>,
-			required: true,
-		},
-	},
-	data() {
-		return {
-			observer: null as null | MutationObserver,
-			hsl: {} as { [color: string]: string },
-		};
-	},
-	created() {
-		const setColors = () => {
-			this.colors.forEach((color) => {
-				const style = getComputedStyle(document.body);
-
-				this.hsl = {
-					...this.hsl,
-					[color]: style.getPropertyValue(color),
-				};
-			});
-		};
-
-		setColors();
-
-		// when theme class is added or removed, reset color values
-		this.observer = new MutationObserver((mutationsList) => {
-			for (const mutation of mutationsList) {
-				if (mutation.type === 'attributes') {
-					setColors();
-				}
-			}
-		});
-		const body = document.querySelector('body');
-		if (body) {
-			this.observer.observe(body, { attributes: true });
-		}
-	},
-	unmounted() {
-		if (this.observer) {
-			this.observer.disconnect();
-		}
-	},
-	methods: {
-		getHexValue(color: string) {
-			return getHex(this.hsl[color]);
-		},
-		getHSLValue(color: string) {
-			return resolveHSLCalc(this.hsl[color]);
-		},
-	},
-});
-</script>
-
 <style lang="scss" module>
 .section {
 	display: flex;