wxPython - problem dynamically adding widgets?

Jaime Wyant programmer.py at gmail.com
Mon Oct 4 22:42:05 CEST 2004

What platform are you using?  Did you call window.layout() after
adding the sizer items?  The code below adds a colored panel to
MainFrame's sizer every 2 seconds (err, approximately).  BTW - there
is a wxPython mailing list that you may be interested in.  Visit
http://www.wxpython.org and look for a mailing lists link.

# wxPython sample...
import wx

# Hey, i'm a patriot!
colors = [wx.RED, wx.WHITE, wx.BLUE]

# Create the "main frame"
class MyFrame( wx.Frame ):
    def __init__( self ):
        wx.Frame.__init__( self, None, -1, "Test" )
        # Create the sizer here / fill it later.
        self.sizer = wx.BoxSizer(wx.VERTICAL)
        self.SetSize( wx.Size( 640, 480 ) )

        # Timer to be called once every 2 or so seconds.
        self.Bind(wx.EVT_TIMER, self.its_been_2_secs)
        self.num_panels = 0

        tmr = wx.Timer(self)

    def its_been_2_secs(self, e):
        if self.num_panels == 10:

        # Create a colored panel to add to the sizer
        pnl = wx.Panel(self)
        pnl.SetBackgroundColour(colors[self.num_panels % 3])
        self.sizer.Add(pnl, 1, wx.EXPAND)

        self.num_panels += 1
class MyApp( wx.App ):
    def OnInit( self ):
        self.frame = MyFrame()
        self.frame.Show( True )        
        return True

def main():
    # Create the application and start it off with the MainLoop method
    app = MyApp(0)

if __name__ == "__main__":

On 4 Oct 2004 13:14:32 -0700, Fazan <dr_burrito at yahoo.com> wrote:
> I'm trying to create a wxPython-based application with a list of
> arbitrary widgets (in this case, progress bars).  I want my
> application to dynamically add or delete widgets from the list based
> on some user action.  I first tried using a BoxSizer, and dynamically
> instantiated the new widgets and added them to the sizer at the right
> time in my application.  This caused my app to hang every time.  Only
> widgets which I created before displaying the main frame were working,
> but subsequent widget creation caused the hanging behavior.
> I've also played around with ListCtrl (with the LC_REPORT style) and
> Grid objects to achieve the desired result with no success.  ListCtrls
> allow text and images to be added; I had hoped to implement my own
> progress bars (instead of using the Gauge class) by resizing images in
> a list.  But the support for images in ListCtrls seems quite limited;
> the image can only exist at the far left side of the list and is
> limited to some fixed size.  In order to implement a progress bar I
> would need more control over the placement and size of the image.
> Although Grids support some additional controls such as Choice and
> CheckBox, they don't even support images and using a Grid seems
> awfully heavyweight.
> The sizer approach seems pretty straightforward but I can't figure out
> why the app always locks up.  Anyone have ideas about how to solve
> this?  TIA
> --
> http://mail.python.org/mailman/listinfo/python-list

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