XRC-Problem: How to replace an object from the xrc-tree after creation

wxPython Users
1

Josh English wrote:

There's a way in XRC to accept custom elements in the xml file, so you
dont' have to replace it. I'd point you to a page on the wiki, but the
wxpyhton site seems to be down.

Josh

Here is, what I want to do:
1.) I have written a custom Widget "Grating" inherited from wxPanel which works fine when loaded into a programm not using xrc.
2.) I'd like to replace an empty wxPanel which I put into the XRC-layout as a place holder by my custom widget.

If going the route of the custom handler doesn't work for you then an easy workaround is to make your Grating widget be a child of the placeholder panel, and use a sizer such that the grating widget completely fills the placeholder.

···

On Wed, Jul 16, 2008 at 8:11 AM, Christian Weickhmann > <christian.weickhmann@gmx.de> wrote:

--
Robin Dunn
Software Craftsman
http://wxPython.org Java give you jitters? Relax with wxPython!

2

Hi,

If going the route of the custom handler doesn't work for you then an
easy workaround is to make your Grating widget be a child of the
placeholder panel, and use a sizer such that the grating widget
completely fills the placeholder.

that is _exactly_ what I'm looking for. But how do I do this?

I've tried:
  in XRC:

  ...
   <object class="unknown" name="g_Grating">
                <size>400,-1</size>
                <flag>wxEXPAND|wxALL</flag>
         </object>
  ...

  in python file:

  ...
  self.G = xrc.XRCCTRL(self.panel, "g_Grating")
  box = wx.BoxSizer(wx.HORIZONTAL)
  box.Add(Grating(self.panel, 0))
  self.G.SetSizer(box)
  ...

But then he says: self.G.SetSizer(box)
AttributeError: 'NoneType' object has no attribute 'SetSizer'

Cheers,
Christian

···

--
Christian Weickhmann
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Tel: +49 (0) 6155 799185
Handy: +49 (0) 172 9542058

--
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and nobody wants to read.
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3

Christian Weickhmann wrote:

Hi,

If going the route of the custom handler doesn't work for you then an
easy workaround is to make your Grating widget be a child of the
placeholder panel, and use a sizer such that the grating widget
completely fills the placeholder.

that is _exactly_ what I'm looking for. But how do I do this?

I've tried:
  in XRC:

  ...
   <object class="unknown" name="g_Grating">
                <size>400,-1</size>
                <flag>wxEXPAND|wxALL</flag>
         </object>
  ...

  in python file:

  ...
  self.G = xrc.XRCCTRL(self.panel, "g_Grating")
  box = wx.BoxSizer(wx.HORIZONTAL)
  box.Add(Grating(self.panel, 0))
  self.G.SetSizer(box)
  ...

But then he says: self.G.SetSizer(box)
AttributeError: 'NoneType' object has no attribute 'SetSizer'

Try this: use class="wxPanel" and then this code:

    self.G = xrc.XRCCTRL(self.panel, "g_Grating")
    box = wx.BoxSizer(wx.HORIZONTAL)
    box.Add(Grating(self.G, 0))
    self.G.SetSizer(box)

This is essentially the same as using XRC's unknown control functionality, except it does some magic behind the scenes.

···

--
Robin Dunn
Software Craftsman
http://wxPython.org Java give you jitters? Relax with wxPython!