[Pygui] Windows not being refreshed

[jka...@juno.com]

Hello - I've enjoyed using the framework so far, but have run in to a 
frustration with my window not being redrawn.   From a basic framework 
perspective, here's how I have things set up. class My_Window( Window )def 
__init__(self, **kwds):
  Window.__init__(self, **kwds)   self._main_frame = Frame( #frame 
attributes )  self._sub_frame = None  self.place( _main_frame )def 
set_sub_frame( self, sub_frame ):  if None <> self._sub_frame: 
self._main_frame.remove( self._sub_frame )  self._main_frame.place( 
sub_frame )  self._sub_frame = sub_frame #end My_Window class class My_App( 
Application )   def __init___( self ):  Application.__init__(self)def 
open_app( self ):  self._main_window = My_Window( #window attributes )  
 # I create other buttons and things on the GUI that will activate  # 
actions in this main application   self._main_window.show() def 
button_is_pressed( self ):   new_frame = Frame( # frame attributes )   
self._main_window.set_sub_frame( new_frame ) #end My_App class my_app = My_App( 
) my_app.run( ) #end code When I give a new sub frame (or any other GUI object) 
in to the main frame, all of the text of both objects are drawn in the main 
window. If I hide the window and bring it back to the front, it'll be re-drawn, 
but I can't seem to find where to do that programmatically. Is there something 
that I'm missing in setting up the application/window? This is really basic 
code that shows the main points (or at least what I believe to be the main 
points for interacting with PyGUI).  Please let me know if there's more 
clarification needed.  Thanks for your time. jason  

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Re: [Pygui] Windows not being refreshed

[jka...@juno.com]

Greg -  Thanks for the response. Initially, I had everything subclassed (MyApp( 
Application ) creating MyWindow( Window ) containing a provided Frame 
containing a MyFrame( Frame ) containing a provided Grid. As an experiment, I 
changed things so that each class just creates one of the built-in object and 
provides a method for retrieving the built in Window/Frame. I left MyApp as a 
subclass of Application so that I would still have someone able to handle 
button events. However, I'm still seeing the same behavior when I scroll 
through the list, namely, not having anything removed from the display when 
something new is supposed to be drawn on it. I feel as though I'm completely 
missing something fundamental. With this sort of setup, when I click to scroll 
down, am I expected to have an overridden method that will be invoked? At what 
level will one of my object be called first? What am I expected to do with that 
call? I've tried creating a draw method (that is invoked when I try to scroll), 
but I'm at a bit of a loss as to what I'm supposed to do with the provided 
canvas and rectangle.  Any help or pointing to the pertinent documentation is 
appreciated. Thanks in advance. jason

-- Original Message --
From: Greg Ewing 
To: "jka...@juno.com" 
Cc: pygui@python.org
Subject: Re: [Pygui] Windows not being refreshed
Date: Sun, 25 Mar 2012 16:56:59 +1300

jka...@juno.com wrote:

> When I give a new sub frame (or any other GUI object) in to the main 
> frame, all of the text of both objects are drawn in the main window. If 
> I hide the window and bring it back to the front, it'll be re-drawn, but 
> I can't seem to find where to do that programmatically. Is there 
> something that I'm missing in setting up the application/window?

Are you talking about user-defined views (derived from View) or
built-in components (buttons, labels, text fields, etc)?

To refresh a user-defined view, you call its invalidate() or
invalidate_rect() method. You shouldn't need to explicitly tell
built-in objects to refresh, they should do it themselves
automatically whenever needed.

Do you have something that isn't refreshing when you think it
should? Can you post a complete example?

-- 
Greg

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