CellLayoutDataFunc   
    typealias CellLayoutDataFunc = (cellLayout: CellLayout, cell: CellRenderer, treeModel: TreeModel, iter: TreeIter) -> Unit(source)
A function which should set the value of @cell_layout’s cell renderer(s) as appropriate.
- param - cellLayouta- GtkCellLayout
- param - cellthe cell renderer whose value is to be set
- param - treeModelthe model
- param - itera- GtkTreeIterindicating the row to set the value for