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frontend/src/desktop/useDocumentDrag.js

@@ -32,6 +32,7 @@ const useDocumentDrag = () => {
     containerRef,
     onDocumentOpen,
     onInspectDocument,
+    onDocumentStackSelect,
     selectedDocumentIds,
     markLayoutDirty,
   } = useDesktopContext();
@@ -286,6 +287,7 @@ const useDocumentDrag = () => {
             .map((value) => (value != null ? String(value) : null))
             .filter(Boolean)
         : null;
+      const stackSelectionAppliedInitial = Boolean(options?.stackSelectionApplied);
 
       let selectionIds = Array.isArray(selectedDocumentIds)
         ? selectedDocumentIds.map((id) => String(id))
@@ -416,6 +418,8 @@ const useDocumentDrag = () => {
             ? performance.now()
             : Date.now();
 
+      const hasStackSource = Array.isArray(stackDocIdsOption) && stackDocIdsOption.length > 1;
+
       dragStateRef.current = {
         docId,
         docKey,
@@ -444,9 +448,11 @@ const useDocumentDrag = () => {
         containerRectTop: containerTop,
         isGroup: isGroupDrag,
         groupDocIds,
-      groupItems,
-      groupElevated: !isGroupDrag,
-    };
+        groupItems,
+        groupElevated: !isGroupDrag,
+        stackDocIds: hasStackSource ? stackDocIdsOption : null,
+        stackSelectionApplied: stackSelectionAppliedInitial || !hasStackSource,
+      };
 
     setDraggingId(docId);
 
@@ -524,6 +530,17 @@ const useDocumentDrag = () => {
           return;
         }
         state.moved = true;
+        if (
+          state.isGroup
+          && !state.stackSelectionApplied
+          && Array.isArray(state.stackDocIds)
+          && state.stackDocIds.length > 1
+        ) {
+          if (typeof onDocumentStackSelect === 'function') {
+            onDocumentStackSelect(state.stackDocIds);
+          }
+          state.stackSelectionApplied = true;
+        }
         if (!state.groupElevated) {
           const layout = layoutRef.current;
           const sortedGroup = state.groupDocIds
@@ -811,6 +828,7 @@ const useDocumentDrag = () => {
       applyTransform,
       recalcVisibleDocIds,
       debugDrag,
+      onDocumentStackSelect,
     ],
   );