XRC question: how to receive wxMenu non-top object?

Krjukov_Victor · November 30, 2002, 7:14pm

Well, nobody has answered so far, and now I even more confused with XRC
usage with wxPython then before.

Can somebody please explain me, how can I derive a class from wxFrame
(say) and load its contents from the .xrc file in it's constructor?

On wxWindows, as I've just learned from

http://cvs.wxwindows.org/viewcvs.cgi/wxWindows/contrib/samples/xrc/myfra
me.cpp?rev=1.1&content-type=text/vnd.viewcvs-markup

that one could define subclass of wxFrame and then call the
wxXmlResource like this:

wxXmlResource::Get()->LoadFrame(this, parent, "main_frame");

this will load frame contents from the .xrc file into our own derived
class.

I'm not an expert in the C++, but from what I've learn, 'this' is a C++
way to say 'self',
parent is a pointer to the parent window (and in this example
parent=None) and "main_frame" is the name of this frame in the .xrc
file.

But wxPython's wxXmlResource.LoadFrame expect *only* two parameters: the
parent and the xml resource name.

You can use it like this (assuming res is an instance of wxXmlResource):

my_frame = res.LoadFrame(parent, "main_frame")

and after this my_frame will hold the frame loaded from .xrc file, but
how can I do the trick in the __init__ function of my subclass derived
from wxFrame?

Victor.

···

-----Original Message-----
From: Krjukov Victor
Sent: Thursday, November 28, 2002 11:43 PM
To: wxPython-users@lists.wxwindows.org
Subject: [wxPython-users] XRC question: how to receive wxMenu
non-top object?

Greetings list,

Vaclav or anybody,

could you please explain me why in the following code:
==>
res = wxXmlResourse("menu.xrc")
self.menuBar = res.LoadMenuBar("MainMenuBar")
self.fileMenu = XRCCTRL(self.menuBar, "FileMenu")
<==

I receive a created menubar in self.menuBar (that's ok), but I receive
None if self.fileMenu?

I know, of course, that I can receive the file menu via

==>
self.fileMenu = self.menuBar.GetMenu(self.menuBar.FindMenu("File"))
<==

but it looks a little bit odd. And Vaclav - <object_ref ...>
didn't work
either (I've tried to use it with
==>
self.fileMenu = res.LoadMenu("MyFileMenu")
<==
but it says "XRC resource 'MyFileMenu' (class 'wxMenu') not found!"

What am I doing wrong?

Here is my menu.xrc:
==>
<?xml version="1.0" ?>
<resource>
  <object class="wxMenuBar" name="MainMenubar">
    <object class="wxMenu" name="FileMenu">
      <label>&File</label>
      <object class="wxMenuItem" name="NewFileMenu">
        <label>&New</label>
        <accel>Ctrl-N</accel>
        <help>New XRC file</help>
      </object>
[skipped...]
    </object>
  </object>
    <object_ref name="MyFileMenu" ref="FileMenu"/>
</resource>
<==

My second question: is there any way to set window id for MenuItem
inside a .xrc file (instead of writing ugly code such as:
==>
FileMenuItem = <code for receiving 'New file' menu item - it is not
obvious for the above reasons ;)>
FileMenuItem.SetId(wxNEW_ID)
<==

Thanks a lot,

--Victor.

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Robin · December 3, 2002, 12:47am

Krjukov Victor wrote:

Well, nobody has answered so far, and now I even more confused with XRC
usage with wxPython then before.

Can somebody please explain me, how can I derive a class from wxFrame
(say) and load its contents from the .xrc file in it's constructor?

On wxWindows, as I've just learned from

http://cvs.wxwindows.org/viewcvs.cgi/wxWindows/contrib/samples/xrc/myfra
me.cpp?rev=1.1&content-type=text/vnd.viewcvs-markup

that one could define subclass of wxFrame and then call the
wxXmlResource like this:

wxXmlResource::Get()->LoadFrame(this, parent, "main_frame");

this will load frame contents from the .xrc file into our own derived
class.

I'm not an expert in the C++, but from what I've learn, 'this' is a C++
way to say 'self', parent is a pointer to the parent window (and in this example
parent=None) and "main_frame" is the name of this frame in the .xrc
file.

But wxPython's wxXmlResource.LoadFrame expect *only* two parameters: the
parent and the xml resource name.

You can use it like this (assuming res is an instance of wxXmlResource):

my_frame = res.LoadFrame(parent, "main_frame")

and after this my_frame will hold the frame loaded from .xrc file, but
how can I do the trick in the __init__ function of my subclass derived
from wxFrame?

Off the top of my head, something like this:

     class MyFrame(wxFrame):
  def __init__(self, parent):
             f = wxPreFrame()
             self.this = f.this
             wxXmlResource_Get().LoadOnFrame(self, parent, "main_frame")

Notice that it doesn't call wxFrame.__init__ and uses wxPreFrame, which returns an instance of a wxFrame that has not yet had its C++ Create(...) method called. This is called 2-stage creation and lets you call Create yourself later, or you can let things like XRC do it for you.

···

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