Declaration [src]

gtk_tree_view_set_column_drag_function (
  GtkTreeView* tree_view,
  GtkTreeViewColumnDropFunc func,
  gpointer user_data,
  GDestroyNotify destroy

Description [src]

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 GtkTreeViewColumns 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.



Type: GtkTreeViewColumnDropFunc

A function to determine which columns are reorderable.

The argument can be NULL.

Type: gpointer

User data to be passed to func.

The argument can be NULL.
The data is owned by the caller of the function.

Type: GDestroyNotify

Destroy notifier for user_data.

The argument can be NULL.