Re: How to access wxglade generated widgets from generic python code.

On 09.04.2019 01:35, Dennis DeBerry via wxGlade-general wrote:
> Here is the error that I am getting:
>
> Traceback (most recent call last):
>   File "c:\Users\<My Name>\Desktop\My Projects\Sqlite 
> Docs\testdataentry6b.py", line 158, in OpenFile
>     create_connection(filename)
>   File "c:\Users\<My Name>\Desktop\My Projects\Sqlite 
> Docs\testdataentry6b.py", line 36, in create_connection
>     list1 = TableList(None,wx.ID_ANY,choices = tablenames)
>   File "c:\Users\<My Name>\Desktop\My Projects\Sqlite 
> Docs\testdataentry6b.py", line 278, in __init__
>     wx.ListBox.__init__(self,parent,id)
>   File 
> "C:\Python27\lib\site-packages\wx-2.8-msw-ansi\wx\_controls.py", line 
> 1290, in __init__
> _controls_.ListBox_swiginit(self,_controls_.new_ListBox(*args, **kwargs))
> wx._core.PyAssertionError: C++ assertion "parent" failed at 
> ..\..\src\common\ctrlcmn.cpp(79) in wxControlBase::CreateControl(): 
> all controls must have parents

You're using wxGlade to generate a class TableList(wx.ListBox) and then 
you call this with parent=None.
This can't work.

Why are you doing so?

Things are much easier if you just leave the Class property of 
listtables at the default value wxListBox, instantiate the dialog, set 
the ListBox to the required values, show the dialog and finally read 
back the selection.

The generated code would look like this (note the wx.ListBox instead of 
TableList):

class TableChoice(wx.Dialog):
     def __init__(self, *args, **kwds):
         .....
         self.listtables = wx.ListBox(self.panel_3, wx.ID_ANY, 
choices=[""], style=wx.LB_NEEDED_SB | wx.LB_SINGLE | wx.LB_SORT)


Usage would be like this:

dlg = TableChoice(parent)
dlg.listtables.SetItems(....)

dlg.ShowModal()

table = dlg.listtables.GetSelection()


You could probably use Code -> ExtraProperties for listtables to make 
your TableChoice dialog accept the choices.
E.g. something like

Property: Items
Value: kwds["tables"]

Then you could use this to instantiate the dialog:

dlg = TableChoice(tables=["table1","table2"])


As Brendan pointed out, it's not a good idea to place all the user code 
into the wxGlade generated Python files.
E.g. your create_connection() function should definitely not be there.

Placing code in the file is fine for prototypes, but once things get 
more complicated, it's better to have a proper structure.


> Here is a link to the wxg file
> https://drive.google.com/open?id=1rH5BFxhmk_bFQCO5ImWv6DSo8-jQbRjT

It's always easier to follow if you attach the files here to the message 
and in the message only quote the relevant parts.


Regards,

Dietmar

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