# TreeView with TreeStore (Python)

Marta Maria Casetti
mmcasetti@gmail.com 2012
A TreeView displaying a TreeStore (simpler example)

# Simpler TreeView with TreeStore

This TreeView displays a TreeStore.

# Code used to generate this example

from gi.repository import Gtk from gi.repository import Pango import sys

books = [["Tolstoy, Leo", "War and Peace", "Anna Karenina"], ["Shakespeare, William", "Hamlet", "Macbeth", "Othello"], ["Tolkien, J.R.R.", "The Lord of the Rings"]]

class MyWindow(Gtk.ApplicationWindow):

def __init__(self, app): Gtk.Window.__init__(self, title="Library", application=app) self.set_default_size(250, 100) self.set_border_width(10)

# the data are stored in the model # create a treestore with one column store = Gtk.TreeStore(str) for i in range(len(books)): # the iter piter is returned when appending the author piter = store.append(None, [books[i][0]]) # append the books as children of the author j = 1 while j < len(books[i]): store.append(piter, [books[i][j]]) j += 1

# the treeview shows the model # create a treeview on the model store view = Gtk.TreeView() view.set_model(store)

# the cellrenderer for the column - text renderer_books = Gtk.CellRendererText() # the column is created column_books = Gtk.TreeViewColumn( "Books by Author", renderer_books, text=0) # and it is appended to the treeview view.append_column(column_books)

# the books are sortable by author column_books.set_sort_column_id(0)

# add the treeview to the window self.add(view)

class MyApplication(Gtk.Application):

def __init__(self): Gtk.Application.__init__(self)

def do_activate(self): win = MyWindow(self) win.show_all()

def do_startup(self): Gtk.Application.do_startup(self)

app = MyApplication() exit_status = app.run(sys.argv) sys.exit(exit_status)

# Useful methods for a TreeView widget

The TreeView widget is designed around a Model/View/Controller design: the Model stores the data; the View gets change notifications and displays the content of the model; the Controller, finally, changes the state of the model and notifies the view of these changes. For more information and for a list of useful methods for TreeModel see .

# API References

In this sample we used the following:

GtkTreeView

GtkTreeModel

GtkTreeStore

GtkCellRendererText

GtkTreeViewColumn