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<?xml version="1.0" encoding="utf-8"?>
<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_cellrenderertoggle.py" xml:lang="el">
<info>
<title type="text">Προβολή δένδρου (TreeView) με αποθήκη δένδρου (TreeStore) (Python)</title>
<link type="guide" xref="beginner.py#treeview"/>
<link type="next" xref="widget_drawing.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>Μια προβολή δένδρου (TreeView) εμφανίζει μια αποθήκη δένδρου (TreeStore) (πιο σύνθετο παράδειγμα, με CellRendererToggle)</desc>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Ελληνική μεταφραστική ομάδα GNOME</mal:name>
<mal:email>team@gnome.gr</mal:email>
<mal:years>2012-2014</mal:years>
</mal:credit>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Δημήτρης Σπίγγος</mal:name>
<mal:email>dmtrs32@gmail.com</mal:email>
<mal:years>2012, 2013</mal:years>
</mal:credit>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Μαρία Θουκιδίδου</mal:name>
<mal:email>marablack3@gmail.com</mal:email>
<mal:years>2014</mal:years>
</mal:credit>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Θάνος Τρυφωνίδης</mal:name>
<mal:email>tomtryf@gmail.com</mal:email>
<mal:years>2014</mal:years>
</mal:credit>
</info>
<title>Πιο σύνθετη προβολή δένδρου με αποθήκη δένδρου</title>
<media type="image" mime="image/png" src="media/treeview_cellrenderertoggle.png"/>
<p>Αυτή η προβολή δένδρου (TreeView) εμφανίζει μια αποθήκη δένδρου (TreeStore) με δύο στήλες, η μια τους αποδίδεται ως μια εναλλαγή.</p>
<links type="section"/>
<section id="code">
<title>Ο χρησιμοποιούμενος κώδικας για παραγωγή αυτού παραδείγματος</title>
<code mime="text/x-python" style="numbered">from gi.repository import Gtk
from gi.repository import Pango
import sys
books = [["Tolstoy, Leo", ["War and Peace", True], ["Anna Karenina", False]],
["Shakespeare, William", ["Hamlet", False],
["Macbeth", True], ["Othello", False]],
["Tolkien, J.R.R.", ["The Lord of the Rings", False]]]
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 two columns
self.store = Gtk.TreeStore(str, bool)
# fill in the model
for i in range(len(books)):
# the iter piter is returned when appending the author in the first column
# and False in the second
piter = self.store.append(None, [books[i][0], False])
# append the books and the associated boolean value as children of
# the author
j = 1
while j < len(books[i]):
self.store.append(piter, books[i][j])
j += 1
# the treeview shows the model
# create a treeview on the model self.store
view = Gtk.TreeView()
view.set_model(self.store)
# the cellrenderer for the first column - text
renderer_books = Gtk.CellRendererText()
# the first column is created
column_books = Gtk.TreeViewColumn("Books", renderer_books, text=0)
# and it is appended to the treeview
view.append_column(column_books)
# the cellrenderer for the second column - boolean rendered as a toggle
renderer_in_out = Gtk.CellRendererToggle()
# the second column is created
column_in_out = Gtk.TreeViewColumn("Out?", renderer_in_out, active=1)
# and it is appended to the treeview
view.append_column(column_in_out)
# connect the cellrenderertoggle with a callback function
renderer_in_out.connect("toggled", self.on_toggled)
# add the treeview to the window
self.add(view)
# callback function for the signal emitted by the cellrenderertoggle
def on_toggled(self, widget, path):
# the boolean value of the selected row
current_value = self.store[path][1]
# change the boolean value of the selected row in the model
self.store[path][1] = not current_value
# new current value!
current_value = not current_value
# if length of the path is 1 (that is, if we are selecting an author)
if len(path) == 1:
# get the iter associated with the path
piter = self.store.get_iter(path)
# get the iter associated with its first child
citer = self.store.iter_children(piter)
# while there are children, change the state of their boolean value
# to the value of the author
while citer is not None:
self.store[citer][1] = current_value
citer = self.store.iter_next(citer)
# if the length of the path is not 1 (that is, if we are selecting a
# book)
elif len(path) != 1:
# get the first child of the parent of the book (the first book of
# the author)
citer = self.store.get_iter(path)
piter = self.store.iter_parent(citer)
citer = self.store.iter_children(piter)
# check if all the children are selected
all_selected = True
while citer is not None:
if self.store[citer][1] == False:
all_selected = False
break
citer = self.store.iter_next(citer)
# if they do, the author as well is selected; otherwise it is not
self.store[piter][1] = all_selected
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)
</code>
</section>
<section id="methods">
<title>Χρήσιμες μέθοδοι για ένα γραφικό στοιχείο TreeView</title>
<p>Το γραφικό στοιχείο TreeView σχεδιάστηκε γύρω από ένα σχέδιο <em>προτύπου/προβολής/ελεγκτή</em>: το <em>πρότυπο</em> αποθηκεύει τα δεδομένα· η <em>Προβολή</em> παίρνει ειδοποιήσεις αλλαγής και εμφανίζει το περιεχόμενο του προτύπου· ο <em>ελεγκτής</em>, τελικά, αλλάζει την κατάσταση του προτύπου και ειδοποιεί την προβολή για αυτές τις αλλαγές. Για περισσότερες πληροφορίες και για μια λίστα χρήσιμων μεθόδων για λίστα TreeModel, δείτε <link xref="model-view-controller.py"/>.</p>
<p>Στη γραμμή 48 το σήμα <code>"toggled"</code> συνδέεται με τη συνάρτηση επανάκλησης <code>on_toggled()</code> χρησιμοποιώντας <code><var>widget</var>.connect(<var>signal</var>, <var>callback function</var>)</code>. Δείτε <link xref="signals-callbacks.py"/> για μια πιο λεπτομερή εξήγηση.</p>
</section>
<section id="references">
<title>Αναφορές API</title>
<p>Σε αυτό το παράδειγμα χρησιμοποιήσαμε τα παρακάτω:</p>
<list>
<item><p><link href="http://developer.gnome.org/gtk3/unstable/GtkTreeView.html">GtkTreeView</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/unstable/GtkTreeModel.html">GtkTreeModel</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/unstable/GtkTreeStore.html">GtkTreeStore</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/unstable/GtkCellRendererText.html">GtkCellRendererText</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/unstable/GtkCellRendererToggle.html">GtkCellRendererToggle</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/unstable/GtkTreeViewColumn.html">GtkTreeViewColumn</link></p></item>
</list>
</section>
</page>
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