Contents

tableView(_:validateDrop:proposedRow:proposedDropOperation:)

Used by aTableView to determine a valid drop target.

Declaration

@MainActor optional func tableView(_ tableView: NSTableView, validateDrop info: any NSDraggingInfo, proposedRow row: Int, proposedDropOperation dropOperation: NSTableView.DropOperation) -> NSDragOperation

Parameters

  • tableView:

    The table view that sent the message.

  • info:

    An object that contains more information about this dragging operation.

  • row:

    The index of the proposed target row.

  • dropOperation:

    The type of dragging operation proposed.

Return Value

The dragging operation the data source will perform.

Discussion

The data source may retarget a drop by calling setDropRow(_:dropOperation:) and returning something other than NSDragOperationNone. A data source might retarget for various reasons, such as to provide better visual feedback when inserting into a sorted position.

To propose a drop on the second row, row would be 2 and operation would be NSTableViewDropOn. To propose a drop below the last row, row would be [aTableView numberOfRows] and operation would be NSTableViewDropAbove.

See Also

Drag and Drop