1 files changed, 48 insertions, 0 deletions
diff --git a/apps/web/src/lib/drag-data.ts b/apps/web/src/lib/drag-data.ts
new file mode 100644
index 00000000..067b0a35
--- /dev/null
+++ b/apps/web/src/lib/drag-data.ts
@@ -0,0 +1,48 @@
+import type { TimelineDragData } from "@/types/drag";
+
+const MIME_TYPE = "application/x-timeline-drag";
+let lastDragData: TimelineDragData | null = null;
+
+export function setDragData({
+	dataTransfer,
+	dragData,
+}: {
+	dataTransfer: DataTransfer;
+	dragData: TimelineDragData;
+}): void {
+	dataTransfer.setData(MIME_TYPE, JSON.stringify(dragData));
+	dataTransfer.setData("text/plain", JSON.stringify(dragData));
+	lastDragData = dragData;
+}
+
+export function getDragData({
+	dataTransfer,
+}: {
+	dataTransfer: DataTransfer;
+}): TimelineDragData | null {
+	const data = dataTransfer.getData(MIME_TYPE);
+	if (data) return JSON.parse(data) as TimelineDragData;
+
+	const textData = dataTransfer.getData("text/plain");
+	if (textData) {
+		try {
+			return JSON.parse(textData) as TimelineDragData;
+		} catch {
+			return lastDragData;
+		}
+	}
+
+	return lastDragData;
+}
+
+export function hasDragData({
+	dataTransfer,
+}: {
+	dataTransfer: DataTransfer;
+}): boolean {
+	return dataTransfer.types.includes(MIME_TYPE) || lastDragData !== null;
+}
+
+export function clearDragData(): void {
+	lastDragData = null;
+}