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outlineView(_:sizeToFitWidthOfColumn:)

Invoked to allow the delegate to provide custom sizing behavior when a column’s resize divider is double clicked.

Declaration

@MainActor optional func outlineView(_ outlineView: NSOutlineView, sizeToFitWidthOfColumn column: Int) -> CGFloat

Parameters

  • outlineView:

    The outline view that sent the message.

  • column:

    The index of the column.

Return Value

The width of the specified column.

Discussion

By default, NSOutlineView iterates every row in the table, accesses a cell via preparedCell(atColumn:row:), and requests the cellSize to find the appropriate largest width to use.

For accurate results and performance, it is recommended that this method is implemented when using large tables. By default, large tables use a monte carlo simulation instead of iterating every row.

See Also

Customizing Column and Row Sizes