<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" xmlns:xi="http://www.w3.org/2001/XInclude" type="guide" style="task" id="treeview_treestore.py" xml:lang="ca">

  <info>

    <title type="text">TreeView with TreeStore (Python)</title>

    <link type="guide" xref="beginner.py#treeview"/>

    <link type="seealso" xref="model-view-controller.py"/>

    <link type="next" xref="model-view-controller.py"/>

    <revision version="0.1" date="2012-06-30" status="draft"/>

    <credit type="author copyright">

      <name>Marta Maria Casetti</name>

      <email its:translate="no">mmcasetti@gmail.com</email>

      <years>2012</years>

    </credit>

    <desc>A TreeView displaying a TreeStore (simpler example)</desc>

  </info>

  <title>Simpler TreeView with TreeStore</title>

  <media type="image" mime="image/png" src="media/treeview_treestore.png"/>

  
This TreeView displays a TreeStore.

  <links type="section"/>

  <section id="code">

    <title>Code used to generate this example</title>

    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)

  </section>

  <section id="methods">

    <title>Useful methods for a TreeView widget</title>

    
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 <link xref="model-view-controller.py"/>.

  </section>

  <section id="references">

    <title>API References</title>

    
In this sample we used the following:

    <list>

      <item>
<link href="http://developer.gnome.org/gtk3/unstable/GtkTreeView.html">GtkTreeView</link>
</item>

      <item>
<link href="http://developer.gnome.org/gtk3/unstable/GtkTreeModel.html">GtkTreeModel</link>
</item>

      <item>
<link href="http://developer.gnome.org/gtk3/unstable/GtkTreeStore.html">GtkTreeStore</link>
</item>

      <item>
<link href="http://developer.gnome.org/gtk3/unstable/GtkCellRendererText.html">GtkCellRendererText</link>
</item>

      <item>
<link href="http://developer.gnome.org/gtk3/unstable/GtkTreeViewColumn.html">GtkTreeViewColumn</link>
</item>

    </list>

  </section>

</page>