Added custom classes and resolved issue

.gitignore

@@ -22,4 +22,8 @@ vite.config.js.timestamp-*
 vite.config.ts.timestamp-*
 
 # .github 
-.github/copilot-instructions.md
+.github/copilot-instructions.md
+
+# pnpm
+
+pnpm-lock.yaml

src/lib/actions/draggable.ts

@@ -1,7 +1,11 @@
 import { dndState } from '$lib/stores/dnd.svelte.js';
 import type { DragDropOptions, DragDropState } from '$lib/types/index.js';
 
+const DEFAULT_DRAGGING_CLASS = 'dragging';
+
 export function draggable<T>(node: HTMLElement, options: DragDropOptions<T>) {
+	const draggingClass = (options.attributes?.draggingClass || DEFAULT_DRAGGING_CLASS).split(' ');
+
 	function handleDragStart(event: DragEvent) {
 		if (options.disabled) return;
 
@@ -15,12 +19,12 @@ export function draggable<T>(node: HTMLElement, options: DragDropOptions<T>) {
 			event.dataTransfer.setData('text/plain', JSON.stringify(options.dragData));
 		}
 
-		node.classList.add('dragging');
+		node.classList.add(...draggingClass);
 		options.callbacks?.onDragStart?.(dndState as DragDropState<T>);
 	}
 
 	function handleDragEnd() {
-		node.classList.remove('dragging');
+		node.classList.remove(...draggingClass);
 		options.callbacks?.onDragEnd?.(dndState as DragDropState<T>);
 
 		// Reset state
@@ -39,7 +43,7 @@ export function draggable<T>(node: HTMLElement, options: DragDropOptions<T>) {
 		dndState.targetContainer = null;
 
 		node.setPointerCapture(event.pointerId);
-		node.classList.add('dragging');
+		node.classList.add(...draggingClass);
 		options.callbacks?.onDragStart?.(dndState as DragDropState<T>);
 	}
 
@@ -53,7 +57,7 @@ export function draggable<T>(node: HTMLElement, options: DragDropOptions<T>) {
 		if (!dndState.isDragging) return;
 
 		node.releasePointerCapture(event.pointerId);
-		node.classList.remove('dragging');
+		node.classList.remove(...draggingClass);
 		options.callbacks?.onDragEnd?.(dndState as DragDropState<T>);
 
 		// Reset state

src/lib/actions/droppable.ts

@@ -1,25 +1,38 @@
 import { dndState } from '$lib/stores/dnd.svelte.js';
 import type { DragDropOptions, DragDropState } from '$lib/types/index.js';
 
+const DEFAULT_DRAG_OVER_CLASS = 'drag-over';
+
 export function droppable<T>(node: HTMLElement, options: DragDropOptions<T>) {
+	const dragOverClass = (options.attributes?.draggingClass || DEFAULT_DRAG_OVER_CLASS).split(' ');
+
 	function handleDragEnter(event: DragEvent) {
 		if (options.disabled) return;
 		event.preventDefault();
 
+		const target = event.target as HTMLElement;
+
 		dndState.targetContainer = options.container;
-		node.classList.add('drag-over');
+		dndState.targetElement = target;
+
+		node.classList.add(...dragOverClass);
 		options.callbacks?.onDragEnter?.(dndState as DragDropState<T>);
 	}
 
 	function handleDragLeave(event: DragEvent) {
 		if (options.disabled) return;
 
 		const target = event.target as HTMLElement;
-		if (!node.contains(target)) {
-			dndState.targetContainer = null;
-			node.classList.remove('drag-over');
-			options.callbacks?.onDragLeave?.(dndState as DragDropState<T>);
-		}
+
+		// check if element is still being dragged over
+		if (!dndState.targetElement?.isSameNode(target)) return;
+
+		node.classList.remove(...dragOverClass);
+
+		options.callbacks?.onDragLeave?.(dndState as DragDropState<T>);
+
+		dndState.targetContainer = null;
+		dndState.targetElement = null;
 	}
 
 	function handleDragOver(event: DragEvent) {
@@ -37,7 +50,7 @@ export function droppable<T>(node: HTMLElement, options: DragDropOptions<T>) {
 		if (options.disabled) return;
 		event.preventDefault();
 
-		node.classList.remove('drag-over');
+		node.classList.remove(...dragOverClass);
 
 		try {
 			if (event.dataTransfer) {
@@ -55,22 +68,22 @@ export function droppable<T>(node: HTMLElement, options: DragDropOptions<T>) {
 		if (options.disabled || !dndState.isDragging) return;
 
 		dndState.targetContainer = options.container;
-		node.classList.add('drag-over');
+		node.classList.add(...dragOverClass);
 		options.callbacks?.onDragEnter?.(dndState as DragDropState<T>);
 	}
 
 	function handlePointerOut(event: PointerEvent) {
 		if (options.disabled || !dndState.isDragging) return;
 
 		dndState.targetContainer = null;
-		node.classList.remove('drag-over');
+		node.classList.remove(...dragOverClass);
 		options.callbacks?.onDragLeave?.(dndState as DragDropState<T>);
 	}
 
 	function handlePointerUp(event: PointerEvent) {
 		if (options.disabled || !dndState.isDragging) return;
 
-		node.classList.remove('drag-over');
+		node.classList.remove(...dragOverClass);
 		options.callbacks?.onDrop?.(dndState as DragDropState<T>);
 	}
 

src/lib/stores/dnd.svelte.ts

@@ -5,5 +5,6 @@ export const dndState = $state<DragDropState>({
 	isDragging: false,
 	draggedItem: null,
 	sourceContainer: '',
-	targetContainer: null
+	targetContainer: null,
+	targetElement: null
 });

src/lib/types/index.ts

@@ -3,6 +3,7 @@ export interface DragDropState<T = unknown> {
 	draggedItem: T;
 	sourceContainer: string;
 	targetContainer: string | null;
+	targetElement: HTMLElement | null;
 }
 
 export interface DragDropCallbacks<T = unknown> {
@@ -14,9 +15,15 @@ export interface DragDropCallbacks<T = unknown> {
 	onDragEnd?: (state: DragDropState<T>) => void;
 }
 
+export interface DragDropAttributes {
+	draggingClass?: string;
+	dragOverClass?: string;
+}
+
 export interface DragDropOptions<T = unknown> {
 	dragData?: T;
 	container: string;
 	disabled?: boolean;
 	callbacks?: DragDropCallbacks<T>;
+	attributes?: DragDropAttributes;
 }

src/routes/custom-classes/+page.svelte

@@ -0,0 +1,110 @@
+<script lang="ts">
+	import { draggable, droppable, type DragDropState } from '$lib/index.js';
+	import { flip } from 'svelte/animate';
+	import { fade } from 'svelte/transition';
+
+	interface Item {
+		id: string;
+		title: string;
+		description: string;
+		priority: 'low' | 'medium' | 'high';
+	}
+
+	const items = $state<Item[]>([
+		{
+			id: '1',
+			title: 'Design System Updates',
+			description: 'Update color palette and component library',
+			priority: 'high'
+		},
+		{
+			id: '2',
+			title: 'User Research',
+			description: 'Conduct interviews with 5 key customers',
+			priority: 'medium'
+		},
+		{
+			id: '3',
+			title: 'API Documentation',
+			description: 'Document new endpoints and examples',
+			priority: 'low'
+		}
+	]);
+
+	function handleDrop(state: DragDropState<Item>) {
+		const { draggedItem, targetContainer } = state;
+		const dragIndex = items.findIndex((item: Item) => item.id === draggedItem.id);
+		const dropIndex = parseInt(targetContainer ?? '0');
+
+		if (dragIndex !== -1 && !isNaN(dropIndex)) {
+			const [item] = items.splice(dragIndex, 1);
+			items.splice(dropIndex, 0, item);
+		}
+	}
+
+	const getPriorityColor = (priority: Item['priority']) => {
+		return {
+			low: 'bg-blue-50 text-blue-700',
+			medium: 'bg-yellow-50 text-yellow-700',
+			high: 'bg-red-50 text-red-700'
+		}[priority];
+	};
+</script>
+
+<div class="min-h-screen bg-gray-50 p-8">
+	<div class="mb-8 flex flex-col gap-2">
+		<h1 class="text-2xl font-bold text-gray-900">Sortable List</h1>
+		<p class="text-gray-600">Drag and drop items to reorder them in the list.</p>
+	</div>
+
+	<div class="w-80">
+		<div class="rounded-xl bg-gray-100 p-4 shadow-sm ring-1 ring-gray-200">
+			<div class="space-y-3">
+				{#each items as item, index (item.id)}
+					<div
+						use:draggable={{ container: index.toString(), dragData: item }}
+						use:droppable={{
+							container: index.toString(),
+							callbacks: { onDrop: handleDrop },
+							attributes: {
+								draggingClass: 'border border-blue-500',
+								dragOverClass: 'border border-red-500'
+							}
+						}}
+						animate:flip={{ duration: 200 }}
+						in:fade={{ duration: 150 }}
+						out:fade={{ duration: 150 }}
+						class="svelte-dnd-touch-feedback cursor-move rounded-lg bg-white p-3 shadow-sm
+                               ring-gray-200 transition-all duration-200 hover:shadow-md hover:ring-2 hover:ring-blue-200"
+					>
+						<div class="mb-2 flex items-start justify-between gap-2">
+							<h3 class="font-medium text-gray-900">
+								{item.title}
+							</h3>
+							<span
+								class={`rounded-full px-2 py-0.5 text-xs font-medium ${getPriorityColor(
+									item.priority
+								)}`}
+							>
+								{item.priority}
+							</span>
+						</div>
+						<p class="text-sm text-gray-500">
+							{item.description}
+						</p>
+					</div>
+				{/each}
+			</div>
+		</div>
+	</div>
+</div>
+
+<style>
+	:global(.dragging) {
+		@apply opacity-50 shadow-lg ring-2 ring-blue-400;
+	}
+
+	:global(.drag-over) {
+		@apply bg-blue-50;
+	}
+</style>