1 files changed, 48 insertions, 0 deletions
diff --git a/apps/web/src/lib/commands/timeline/element/update-element-start-time.ts b/apps/web/src/lib/commands/timeline/element/update-element-start-time.ts
new file mode 100644
index 00000000..5312000f
--- /dev/null
+++ b/apps/web/src/lib/commands/timeline/element/update-element-start-time.ts
@@ -0,0 +1,48 @@
+import { Command } from "@/lib/commands/base-command";
+import type { TimelineTrack } from "@/types/timeline";
+import { EditorCore } from "@/core";
+
+export class UpdateElementStartTimeCommand extends Command {
+	private savedState: TimelineTrack[] | null = null;
+
+	constructor(
+		private elements: { trackId: string; elementId: string }[],
+		private startTime: number,
+	) {
+		super();
+	}
+
+	execute(): void {
+		const editor = EditorCore.getInstance();
+		this.savedState = editor.timeline.getTracks();
+
+		const updatedTracks = this.savedState.map((track) => {
+			const hasElementsToUpdate = this.elements.some(
+				(el) => el.trackId === track.id,
+			);
+
+			if (!hasElementsToUpdate) {
+				return track;
+			}
+
+			const newElements = track.elements.map((element) => {
+				const shouldUpdate = this.elements.some(
+					(el) => el.elementId === element.id && el.trackId === track.id,
+				);
+				return shouldUpdate
+					? { ...element, startTime: Math.max(0, this.startTime) }
+					: element;
+			});
+			return { ...track, elements: newElements } as typeof track;
+		});
+
+		editor.timeline.updateTracks(updatedTracks);
+	}
+
+	undo(): void {
+		if (this.savedState) {
+			const editor = EditorCore.getInstance();
+			editor.timeline.updateTracks(this.savedState);
+		}
+	}
+}