From 09cb8c8d984e3e82f60e28b352508c876423fbdf Mon Sep 17 00:00:00 2001
From: Maze Winther <mazewinther@gmail.com>
Date: Fri, 1 Aug 2025 09:51:54 +0200
Subject: fix: resize not matching with frames

---
 apps/web/src/hooks/use-timeline-element-resize.ts | 29 ++++++++++++++++++-----
 1 file changed, 23 insertions(+), 6 deletions(-)

(limited to 'apps/web/src/hooks')

diff --git a/apps/web/src/hooks/use-timeline-element-resize.ts b/apps/web/src/hooks/use-timeline-element-resize.ts
index d57533e0..ba13e05a 100644
--- a/apps/web/src/hooks/use-timeline-element-resize.ts
+++ b/apps/web/src/hooks/use-timeline-element-resize.ts
@@ -221,17 +221,34 @@ export function useTimelineElementResize({
         }
       } else {
         // Normal trimming within original duration
-        const maxTrimEnd = element.duration - resizing.initialTrimStart - 0.1; // Leave at least 0.1s visible
-        const newTrimEnd = snapTimeToFrame(
-          Math.max(0, Math.min(maxTrimEnd, calculated)),
-          projectFps
+        // Calculate the desired end time based on mouse movement
+        const currentEndTime =
+          element.startTime +
+          element.duration -
+          element.trimStart -
+          element.trimEnd;
+        const desiredEndTime = currentEndTime + deltaTime;
+
+        // Snap the desired end time to frame
+        const snappedEndTime = snapTimeToFrame(desiredEndTime, projectFps);
+
+        // Calculate what trimEnd should be to achieve this snapped end time
+        const newTrimEnd = Math.max(
+          0,
+          element.duration -
+            element.trimStart -
+            (snappedEndTime - element.startTime)
         );
 
+        // Ensure we don't trim more than available content (leave at least 0.1s visible)
+        const maxTrimEnd = element.duration - element.trimStart - 0.1;
+        const finalTrimEnd = Math.min(maxTrimEnd, newTrimEnd);
+
         updateElementTrim(
           track.id,
           element.id,
-          resizing.initialTrimStart,
-          newTrimEnd,
+          element.trimStart,
+          finalTrimEnd,
           false
         );
       }
-- 
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