gtkTreeViewSetColumnDragFunction: gtkTreeViewSetColumnDragFunction
Description
Sets a user function for determining where a column may be dropped when
dragged. This function is called on every column pair in turn at the
beginning of a column drag to determine where a drop can take place. The
arguments passed to func
are: the tree.view
, the GtkTreeViewColumn
being
dragged, the two GtkTreeViewColumn
s determining the drop spot, and
user.data
. If either of the GtkTreeViewColumn
arguments for the drop spot
are NULL
, then they indicate an edge. If func
is set to be NULL
, then
tree.view
reverts to the default behavior of allowing all columns to be
dropped everywhere.Usage
gtkTreeViewSetColumnDragFunction(object, func, user.data = NULL)
Arguments
func
A function to determine which columns are reorderable, or NULL
. [ allow-none ] user.data
User data to be passed to func
, or NULL
. [ allow-none ]