I've found a solution. I was closing the window using the x button, which must have been destroying the widget and it's associated list store. Instead I am now using a custom button that merely hides the window.
ComboBoxText in Glade / GTK+3 / Python - disappears when displayed 2nd time
سؤال
I'm trying to implement a drop down list in an Ubuntu app using Glade (GTK+3) and Python. I can get the ComboBoxText to display, populated with strings. However when I close the window it is contained in and then re-open it, the combobox is not there, just a completely blank window.
I added the ComboBoxText widget in question to a window in Glade. I then added this code in my Python programme:
def on_button_edit_clicked(self, widget):
""" display list of events already stored, and allow deletion """
self.combo = self.builder.get_object('combo_box')
self.store = Gtk.ListStore(str)
self.store.append(['hello'])
self.store.append(['goodbye'])
self.combo.set_model(self.store)
event_editor = self.builder.get_object("event_editor")
event_editor.show()
I even tried destroying the widget to see if that helps:
def on_event_editor_destroy(self, widget):
self.combo.destroy()
self.store = Gtk.ListStore(str)
self.combo.set_model(self.store)
EDIT:
I have since tried some alternative code, that included a CellRendererText object, but still no luck.
These are my sources: I created a Gtk.ListStore(), then I created a Gtk.CellRendererText(), then I created a Gtk.ComboBox(). This was all in-line with example 13.3 here.
Nothing works. When I open the combobox window a 2nd time, it is just a blank window. Can anyone help please?
المحلول
نصائح أخرى
The title says, "ComboBoxText in Glade / GTK+3 / Python..." then u try to implement a GtkComboBox, not a GtkComboBoxText. Why torture yourself with a GtkComboBox.
Glade file (snippet)
<object class="GtkComboBoxText" id="comboboxtextEventEditor">
<property name="visible">True</property>
<property name="can_focus">False</property>
<property name="halign">end</property>
<property name="margin_right">10</property>
<property name="hexpand">True</property>
<property name="entry_text_column">0</property>
<property name="id_column">1</property>
<signal name="changed" handler="on_changed_event_editor" swapped="no"/>
</object>
Notice no GtkListStore is needed for a GtkComboBoxText. Now some class methods
from __future__ import print_function
from gi.repository import Gtk
import os
def TheClass(Gtk.ApplicationWindow):
#class variable
UI_FILE = "preference.glade"
@staticmethod
def get_id():
return "windowTheClass"
def __init__(self, app):
""" Constructor"""
# Initialize class variables.
#app is an instance of a class which extends Gtk.Application
#Hardcode to have a working example code
self.ui_path = os.path.join("home", "useraccount", "Documents", "example")
#self.app = app
#self.ui_path = self.app.ui_path
# Load ui
self.__load_ui()
self.__initialize_event_editor_combobox()
def __load_ui(self):
self.builder = Gtk.Builder()
try:
strUIFile = os.path.join(self.ui_path, self.UI_FILE)
self.builder.add_from_file( strUIFile )
del strUIFile
self.win = self.builder.get_object( self.__class__.get_id() )
# This is not useful until Gtk version 3.6
#self.app.add_window(self.win)
self.builder.connect_signals(self)
except:
print(self.__class__.__name__ + ".__load_ui error", sys.exc_info()[1])
def __initialize_event_editor_combobox(self):
""" Populate event editor comboboxtext"""
combobox = self.builder.get_object("comboboxtextEventEditor")
combobox.remove_all()
# Args [position, id, text]
combobox.insert(0,"0", "Hello")
combobox.insert(0,"1", "goodbye")
combobox.set_active_id("1")
del combobox
def on_changed_event(self, widget, data=None):
""" combobox value selected. Refresh combobox"""
strSelectedEntry = widget.get_active_text()
print(self.__class__.__name__ + ".on_changed_event", strSelectedEntry)
#self.initialize_something_else(strSelectedEntry)
del strSelectedEntry