Returns a Boolean value that indicates whether auto-expanded items should return to their original collapsed state.
- macOS 10.0+
true, the drop terminated successfully; if
falsethe drop failed.
true if auto-expanded items should return to their original collapsed state; otherwise
Override this method to provide custom behavior. If the target of a drop is not auto-expanded (by hovering long enough) the drop target still gets expanded after a successful drop unless this method returns
true. The default implementation returns
false after a successful drop.
This method is called in a variety of situations. For example, it is called shortly after the
outline method is called and also if the drag exits the outline view (exiting the view is treated the same as a failed drop). The return value of the
outline method determines the incoming value of the