[pygtk] [PyGTK] Singleton Window

[Steve McClure]

On Mar 7, 2009, at 1:22 PM, alex goretoy wrote:

> I apologize for reposting this....I just never received an answer  
> from the pythonlist(which makes sense, since It was intended for  
> pygtk list )
>
> Please, how to make shmingleton show contents again when re-opening  
> window(hide(), then show() or show_all()) without recreating it?
> does GC run on the destroyed object if I destroy() the window? If  
> so , then that means I have to recreate it and my options are to  
> hide() then show(), but how to get contents back?
>
> There seems to be not alot of content on this subject on the net.

I use a delete handler that calls hide then returns True. That way the  
widget isn't destroyed and I can then just call show when the dialog  
needed to be displayed again.

>
>
> I am trying to create a singleton window in pygtk and for the life  
> of me can't seem to figure out a better way to go about doing this.  
> The way I'm doing it now is to recreate the window and show it.  
> Example code is below. I would much appreciate any assistance in  
> this matter. I've googled to no avail. I'm hiding the child window  
> because when I execute main_quit on the child it kills parent (which  
> makes sense).
>
> My singleton hack works, but its cluncky, I am wondering if theres  
> some other way(working shmingleton?).
>
> My question is this. How to create a singleton child window without  
> hiding old childs(seeing as this creates many hidden childs after a  
> while) or how to hide it and when showing it again also have it  
> display all contents in the child window?
>
> Thank you.
>
> #!/usr/bin/env python
> import os, sys
>
> import pygtk
> pygtk.require('2.0')
> try:
>   import gtk
> except:
>   print >> sys.stderr, "You need to install the python gtk bindings"
>   sys.exit(1)
>
>
>
> class Singleton_Test(object):
>   def __init__(self):
>     self.root_window = gtk.Window( type=gtk.WINDOW_TOPLEVEL )
>     self.root_window.set_title("Singleton Test")
>     self.root_window.connect("delete_event", lambda w,e:  
> gtk.main_quit())
>
>     self.vbox = gtk.VBox(False,0)
>     self.root_window.add(self.vbox)
>     self.vbox.show()
>
>     self.singleton_button = gtk.Button("SINGLETON")
>     self.singleton_button.connect("clicked",self.singleton_cb)
>     self.vbox.pack_start(self.singleton_button,False,False,0)
>
>     self.singleton_button.show()
>
>     self.shmingleton_button = gtk.Button("SHMINGLETON")
>     self.shmingleton_button.connect("clicked",self.shmingleton_cb)
>     self.vbox.pack_start(self.shmingleton_button,False,False,0)
>
>     self.shmingleton_button.show()
>
>     self.create_singleton_child_window()
>
>     self.root_window.show()
>
>   singleton_window_count=0
>   def singleton_cb(self,w):
>     if self.singleton_window_count>0:
>       self.create_singleton_child_window()
>
>     self.singleton_child_window.show()
>     print "singleton child window count is  
> ",self.singleton_window_count
>     self.singleton_window_count+=1
>
>   def shmingleton_cb(self,w):
>     self.singleton_child_window.show_all() #doesn't work as  
> expected, neither does show
>
>
>   def create_singleton_child_window(self):
>     self.singleton_child_window = gtk.Window(gtk.WINDOW_TOPLEVEL)
>     self.singleton_child_window.set_title("SINGLETON child")
>
>     #only hiding since gtk.main_quit kills parent, any better way?
>     self.singleton_child_window.connect("destroy", lambda w:  
> self.singleton_child_window.hide()) #or destroy()
>     self.singleton_child_window.connect("delete_event", lambda w,e:  
> self.singleton_child_window.hide()) #or destroy()
>
>     self.vbox = gtk.VBox(False, 0)
>     self.singleton_child_window.add(self.vbox)
>     self.vbox.show()
>     self.label = gtk.Label("SINGLETON")
>     self.vbox.pack_start(self.label,False,False,0)
>     self.label.show()
>
>   def main(self):
>     gtk.main()
>
> if __name__ == "__main__":
>   singleton = Singleton_Test()
>   singleton.main()
>
> -Alex Goretoy
> http://www.goretoy.com
>
>
>
> _______________________________________________
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> Read the PyGTK FAQ: http://faq.pygtk.org/

--
Steve McClure
smcclure at racemi.com

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