Refactor: improve code modularity

Frontend/src/helper/createLongPressGesture.ts

@@ -0,0 +1,75 @@
+// Path: Frontend/src/helper/createLongPressGesture.ts
+
+import type { JSX } from "solid-js";
+
+type PointerHandler = NonNullable<JSX.DOMAttributes<Element>["onPointerDown"]>;
+
+type LongPressGestureOptions = {
+	onLongPress: () => void;
+	delay?: number;
+	movementThreshold?: number;
+};
+
+type LongPressGestureHandlers = {
+	onPointerDown: PointerHandler;
+	onPointerMove: PointerHandler;
+	onPointerUp: PointerHandler;
+	onPointerCancel: PointerHandler;
+	onPointerLeave: PointerHandler;
+};
+
+export const createLongPressGesture = (options: LongPressGestureOptions): LongPressGestureHandlers => {
+	let timeoutId: number | undefined;
+	let originX = 0;
+	let originY = 0;
+
+	const delay = options.delay ?? 420;
+	const movementThreshold = options.movementThreshold ?? 10;
+
+	const clearPendingLongPress = (): void => {
+		if (typeof timeoutId === "number") {
+			window.clearTimeout(timeoutId);
+			timeoutId = undefined;
+		}
+	};
+
+	const onPointerDown: PointerHandler = (event): void => {
+		// Mobile long-press should only respond to the primary touch/pen pointer.
+		if (event.pointerType === "mouse" || !event.isPrimary) {
+			return;
+		}
+
+		originX = event.clientX;
+		originY = event.clientY;
+		clearPendingLongPress();
+		timeoutId = window.setTimeout(() => {
+			timeoutId = undefined;
+			options.onLongPress();
+		}, delay);
+	};
+
+	const onPointerMove: PointerHandler = (event): void => {
+		if (typeof timeoutId !== "number") {
+			return;
+		}
+
+		const deltaX = Math.abs(event.clientX - originX);
+		const deltaY = Math.abs(event.clientY - originY);
+
+		if (deltaX > movementThreshold || deltaY > movementThreshold) {
+			clearPendingLongPress();
+		}
+	};
+
+	const onPointerUp: PointerHandler = (): void => {
+		clearPendingLongPress();
+	};
+
+	return {
+		onPointerDown,
+		onPointerMove,
+		onPointerUp,
+		onPointerCancel: onPointerUp,
+		onPointerLeave: onPointerUp,
+	};
+};