The TreeViewColumns in a
TreeView can be retrieved singly or as a list using
the methods:
treeviewcolumn = treeview.get_column(n)
columnlist = treeview.get_columns()
where n is the index (starting from 0)
of the column to retrieve. A column can be removed using the method:
treeview.remove_column(column)
where column is a
TreeViewColumn in
treeview.
Rows that have child rows are displayed in the
TreeView with an expander arrow (see Figure 14.3, “CellRenderer Data Function”) that the user clicks on to hide or reveal the
child row(s). The column that the expander arrow is displayed in can be
changed using the method:
treeview.set_expander_column(column)
where column is a
TreeViewColumn in treeview. This method is useful
when you want the first column to not indent. For example, Figure 14.7, “Expander Arrow in Second Column” illustrates the expander arrow in the
second column:
All the rows displayed in a TreeView can
be programmatically expanded or collapsed using the following
methods:
treeview.expand_all() treeview.collapse_all()
These methods are useful if you want to initialize the
TreeView display to a known state. Individual rows
can be expanded or collapsed using:
treeview.expand_row(path,open_all) treeview.collapse_row(path)
where path is the tree path to a row in
treeview, and if open_all is TRUE
all descendant rows of path are expanded; otherwise
just the immediate children are expanded.
You can determine if a row is expanded using the method:
is_expanded = treeview.row_expanded(path)