---
title: selectionIsChangingNotification
framework: appkit
role: symbol
role_heading: Type Property
path: appkit/nsoutlineview/selectionischangingnotification
---

# selectionIsChangingNotification

Posted as the outline view’s selection changes (while the mouse button is still down).

## Declaration

```swift
class let selectionIsChangingNotification: NSNotification.Name
```

## Discussion

Discussion The notification object is the outline view whose selection is changing. This notification does not contain a userInfo dictionary. To observe this notification using Swift concurrency, use NSOutlineView.SelectionIsChangingMessage.

## See Also

### Notifications

- [columnDidMoveNotification](appkit/nsoutlineview/columndidmovenotification.md)
- [columnDidResizeNotification](appkit/nsoutlineview/columndidresizenotification.md)
- [itemDidCollapseNotification](appkit/nsoutlineview/itemdidcollapsenotification.md)
- [itemDidExpandNotification](appkit/nsoutlineview/itemdidexpandnotification.md)
- [itemWillCollapseNotification](appkit/nsoutlineview/itemwillcollapsenotification.md)
- [itemWillExpandNotification](appkit/nsoutlineview/itemwillexpandnotification.md)
- [selectionDidChangeNotification](appkit/nsoutlineview/selectiondidchangenotification.md)