Re: [Boa Constr] wxGrid in Boa

[Riaan B. <riaan@e.co.za>]

Hi Lynndon,

"Harnell, Lynndon" wrote:
> 
> >FROM: Riaan Booysen
> >DATE: 08/20/2001 10:43:42
> >SUBJECT: RE: [Boa Constr] wxGrid in Boa
> >Hi Lynndon, please send plain text mail to the mailing list!
> 
> Will do. Is this OK?

Perfect,

> 
> >Luckily there is support already built into Boa to do what you want.
> 
> >It's called 'custom classes'. The first change you need to make, is to
> >change your dbGrid class to have the same constructor as the original
> >wxGrid class.
> 
> By this do you mean the line?:
>   wxGrid.__init__(self,parent,-1, style= wxSIMPLE_BORDER|wxSUNKEN_BORDER)

The line above it would be the class constructor. def __init__(...

You defined a new class called dbGrid. Boa will generate source
using your class name, but with the same constructor signature as the 
class we defined your class equivalent to with the line: 
_custom_classes = {'wxGrid': ['dbGrid']}

I don't exactly know how you expect this dbGrid class to behave in the
Designer. For the Designer it will be a wxGrid, not your class, so
you won't see any new properties or behaviour.

I need you to understand what happens here, trying to do what I 
recommend without really understanding will cause problems later, 
so if this is still unclear, please ask.

> Boa inserts code like this:
>   self.grid1 = wxGrid(id = wxID_WXFRAME1GRID1, name = 'grid1', parent =
> self.panel1, pos = wxPoint(104, 24), size = wxSize(136, 80), style= 0)
> 
> So that I should change the first to something like?:
> 
>   wxGrid.__init__(ID, self,parent,-1, pos, size, style=
> wxSIMPLE_BORDER|wxSUNKEN_BORDER)

See above, 

There are 2 routes I usually consider:

One, to copy the definition from the docs:

    def __init__(self, parent, id=-1, pos=wxDefaultPosition, 
                 size=wxDefaultSize, style=wxWANTS_CHARS, name='grid')
        wxGrid.__init__(self, parent, id, pos, size, style, name)

Two, to copy the wxPython (SWIG) signature:

    def __init__(self, *_args, **_kwargs):
	apply(wxGrid.__init__, _args, _kwargs)

	# access parameters from the _kwargs, e.g. _kwargs['style']

I usually use the second form when using _custom_classes. 
It's ugly, but it's short and it only passes on the args that are 
defined.

>   self.grid1 = wxGrid(id = wxID_WXFRAME1GRID1, name = 'grid1', parent =
> self.panel1, pos = wxPoint(104, 24), size = wxSize(136, 80), style= 0)
> 
> >Then uncomment the line
> >#        self.grid1 = wxGrid ...
> >
> >and delete the line you added
> >
> >          self.grid1 = dbGrid ...
> 
> OK understood
> 
> >Now add the following _custom_classes line to the top of the wxFrame1
> >definition as a class attribute:
> 
> >class wxFrame1(wxFrame):
> 
> >    _custom_classes = {'wxGrid': ['dbGrid']}
> 
> >    def _init_utils(self):
> 
> Got that.
> 
> >Now open the Designer, select the Grid and change the Class property
> >from wxGrid to dbGrid.
> 
> That too.
> 
> >You will notice that the constructor you defined takes 1 parameter,
> >yet it is called with 5 keyword parameters in the source.
> 
> Is this the line you mean in referring to the constructor definition, and is
> the one parameter the style?

I refered to:

    def __init__(self,parent):

> 
>   wxGrid.__init__(self,parent,-1, style= wxSIMPLE_BORDER|wxSUNKEN_BORDER)

Just to clear up terminology, your line above is not the constructor
definition/declaration, but where the base class's constructor is
called within the constructor's code block.

> 
> and is this the line you mean with 5 keywords in the source? There are 6
> parameters within the wxGrid brackets (ID,NAME,PARENT,POS,SIZE,STYLE) or is
> one ignored?

Sorry I did not count correctly, but this is beside the point. The 
point I tried to make was that it was more than the one parameter
you had in your __init__ method ;)

> 
>   self.grid1 = wxGrid(id = wxID_WXFRAME1GRID1, name = 'grid1', parent =
> self.panel1, pos = wxPoint(104, 24), size = wxSize(136, 80), style= 0)
> 
> Thanks for all your help.

Hope this is all starting to make sense.

> 
> Lynndon
> 
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-- 
Riaan Booysen
___________________________________________________
Boa Constructor - RAD GUI building IDE for wxPython
     http://boa-constructor.sourceforge.net