itemWillCollapseNotification
Posted before an item is collapsed (after the user clicks the arrow but before the item is collapsed).
Declaration
class let itemWillCollapseNotification: NSNotification.NameDiscussion
The notification object is the NSOutlineView object that contains the item about to be collapsed. A collapsed item’s children will lose their status as being selected. The userInfo dictionary contains the following information:
Key | Value |
|---|---|
| The item about to be collapsed (an id) |