wxPython, dynamically modify window

[Grant]

Hi, I am looking for a tip. I have a panel and a checkbox. When I
check the checkbox, I would like to add buttons to the panel
(dynamically). When the checkbox is unchecked, the buttons should not
appear (be deleted)---all the while, the window should resize if necessary.

If you have a simpler example, that is fine. I just need a hint as to
how you dynamically change the widgets and their layouts.

Looking at the wx demos, there is something close wx.lib.expando, but
this is just modifying a particular widget.

Thanks.

[cmcp]

Grant wrote:

Hi, I am looking for a tip. I have a panel and a checkbox. When I
check the checkbox, I would like to add buttons to the panel
(dynamically). When the checkbox is unchecked, the buttons should not
appear (be deleted)---all the while, the window should resize if necessary.

Here is one way that seems to work (wxPython 2.7, Python 2.5, Mac OS X
10.4.8). It uses a sizer's Hide() and Show() methods to control
visibility of a child sizer containing the buttons. To resize the frame
containing the checkbox and buttons, ensure the frame has a sizer and
use the Fit() method after Hiding and Showing the buttons.
HTH,
-- CMcP

import wx

class AppFrame(wx.Frame):
def __init__(self, parent, title):
wx.Frame.__init__(self, parent, -1, title)
panel = wx.Panel(self, -1)
panel_sizer = wx.BoxSizer(wx.VERTICAL)
panel.SetSizer(panel_sizer)

cb = wx.CheckBox(panel, -1, 'Need some buttons')
cb.SetValue(False)
self.Bind(wx.EVT_CHECKBOX, self.EvtCheckBox, cb)

button_sizer = wx.BoxSizer(wx.HORIZONTAL)
b1 = wx.Button(panel, -1, 'Button 1')
b2 = wx.Button(panel, -1, 'Button 2')
button_sizer.Add(b1, 0, wx.ALL, 5)
button_sizer.Add(b2, 0, wx.ALL, 5)

panel_sizer.Add(cb, 0, wx.ALL, 5)
panel_sizer.Add(button_sizer)

panel_sizer.Hide(button_sizer, recursive=True)

frame_sizer = wx.BoxSizer()
frame_sizer.Add(panel, 1, wx.EXPAND)

self.SetSizer(frame_sizer)
self.panel_sizer = panel_sizer
self.button_sizer = button_sizer

self.Fit()

def EvtCheckBox(self, event):
cb = event.GetEventObject()
if cb.GetValue() == True:
self.panel_sizer.Show(self.button_sizer, recursive=True)
else:
self.panel_sizer.Hide(self.button_sizer, recursive=True)
self.Fit()

class App(wx.App):
def OnInit(self):
frame = AppFrame(None, 'Hide/Show Example')
self.SetTopWindow(frame)
frame.Show()
return True

if __name__ == '__main__':
app = App()
app.MainLoop()