feat: basic ripple editing

2 files changed, 18 insertions, 0 deletions

diff --git a/apps/web/src/lib/timeline/index.ts b/apps/web/src/lib/timeline/index.ts
index f3ace94f..b5e74a45 100644
--- a/apps/web/src/lib/timeline/index.ts
+++ b/apps/web/src/lib/timeline/index.ts
@@ -4,6 +4,7 @@ export * from "./track-utils";
 export * from "./element-utils";
 export * from "./zoom-utils";
 export * from "./ruler-utils";
+export * from "./ripple-utils";
 
 export function calculateTotalDuration({
 	tracks,
diff --git a/apps/web/src/lib/timeline/ripple-utils.ts b/apps/web/src/lib/timeline/ripple-utils.ts
new file mode 100644
index 00000000..5f37bf29
--- /dev/null
+++ b/apps/web/src/lib/timeline/ripple-utils.ts
@@ -0,0 +1,17 @@
+import type { TimelineElement } from "@/types/timeline";
+
+export function rippleShiftElements({
+	elements,
+	afterTime,
+	shiftAmount,
+}: {
+	elements: TimelineElement[];
+	afterTime: number;
+	shiftAmount: number;
+}): TimelineElement[] {
+	return elements.map((element) =>
+		element.startTime >= afterTime
+			? { ...element, startTime: element.startTime - shiftAmount }
+			: element,
+	);
+}