gtk3 window is not redrawn correctly

Question

I am creating a simple GTK3 application. The main toplevel window has a search button which will display another toplevel gtk3 window. When I click the close button (near the titlebar) on the second gtk3 window it closes as expected. However, when I click on the search button again, the second toplevel window is not redrawn with all its widgets..instead it appears empty.

If on the other hand, I click the close button (gtk button seen at the bottom) it closes properly. And when reopned all the widgets can be seen.

Info: I created the UI using Glade.

The code is displayed below. However to get the UI files, you need to download the package. You can download them here

#! /usr/bin/env python

from gi.repository import Gtk
import os,sys

UI_FILE = "main.ui"
SECOND_UI_FILE = "second.ui"

class SampleApp:
    def __init__(self):
        self.builder = Gtk.Builder()
        self.builder.add_from_file(UI_FILE)
        self.builder.connect_signals(self)

        self.builder2 = Gtk.Builder()
        self.builder2.add_from_file(SECOND_UI_FILE)
        self.builder2.connect_signals(self)

        self.window = self.builder.get_object('window')
        self.window.set_position(Gtk.WindowPosition.CENTER)
        self.window.connect("destroy", self.destroy)
        self.window.show_all()

        self.search = self.builder.get_object('button1')
        self.search.connect("clicked", self.search_clicked)

    def destroy(self, window):
        Gtk.main_quit()

    def search_clicked(self, window):
        self.secondwindow = self.builder2.get_object('window1')
        self.secondwindow.show_all()

def main():
    app = SampleApp()
    Gtk.main()

if __name__ == "__main__":
    main()

Main Window

Second Window - Toplevel

Second Window - Blank

Why does this happen and how do I solve this?

Answer 1

Ok, what your code does is, it lets the second window get destroyed. After that its gone.

You can either keep the window from being destroyed (and hide it instead) by adding these two lines at the end of your init method:

secondwindow = self.builder2.get_object('window1')
secondwindow.connect('delete-event', lambda w, e: w.hide() or True)

which replaces the delete event (documentation here).

Or you can recreate the window everytime you open it, by placing those lines at the beginning of your search_clicked method:

self.builder2 = Gtk.Builder()
self.builder2.add_from_file(SECOND_UI_FILE)
self.builder2.connect_signals(self)