1 files changed, 21 insertions, 0 deletions
diff --git a/apps/web/src/timeline/drag-utils.ts b/apps/web/src/timeline/drag-utils.ts
new file mode 100644
index 00000000..a731d7a0
--- /dev/null
+++ b/apps/web/src/timeline/drag-utils.ts
@@ -0,0 +1,21 @@
+import { BASE_TIMELINE_PIXELS_PER_SECOND } from "@/timeline/scale";
+import { TICKS_PER_SECOND } from "@/wasm";
+
+export function getMouseTimeFromClientX({
+	clientX,
+	containerRect,
+	zoomLevel,
+	scrollLeft,
+}: {
+	clientX: number;
+	containerRect: DOMRect;
+	zoomLevel: number;
+	scrollLeft: number;
+}): number {
+	const mouseX = clientX - containerRect.left + scrollLeft;
+	const seconds = Math.max(
+		0,
+		mouseX / (BASE_TIMELINE_PIXELS_PER_SECOND * zoomLevel),
+	);
+	return Math.round(seconds * TICKS_PER_SECOND);
+}