Hi,
John Labenski wrote:
> On Nov 16, 2007 8:47 AM, Hakki Dogusan <[EMAIL PROTECTED]> wrote:
>> Hi,
>>
>> Is it possible to extend wxArtProvider in wxLua? wx's document shows
>> following sample:
>>
>> class MyProvider : public wxArtProvider
>> {
>> protected:
>> wxBitmap CreateBitmap(const wxArtID& id,
>> const wxArtClient& client,
>> const wxSize size)
>> { ... }
>> };
>> ...
>> wxArtProvider::Push(new MyProvider);
>>
>
> Unfortunately not, a class like wxLuaPrintout that allows overriding
> virtual functions would have to be written. I'll try to remember to do
> it.
>
> There's a general issue about creating our own classes to allow
> overriding virtual functions however, if we continue to create more
> and more of them we'll end up with a lot of wxLuaXXX classes on top of
> the original XXX classes and that seems awkward to me since you
> shouldn't have to worry about such things in wxLua. It could be made
> transparent by calling them just XXX in Lua, but I think this could be
> a problem if you call a function that returns an XXX class, but wxLua
> only deals with our subclassed wxLuaXXX classes.
>
> For example: We write wxLuaTreeCtrl so we can override
> OnCompareItems(...) in Lua and as above treat all wxTreeCtrls as
> wxLuaTreeCtrls. Everything is great if all wxTreeCtrls are created in
> wxLua since they'll all be wxLuaTreeCtrls. There's a problem if a user
> uses wxGlade (or whatever) to create XML files for their GUI and then
> they try to get their wxTreeCtrl, but wxLua pushes it as a
> wxLuaTreeCtrl which it's not. The wxGenericDirCtrl creates it's own
> wxTreeCtrl which you can get using wxGenericDirCtrl ::GetTreeCtrl(),
> same problem as above.
>
> I guess I have to look at wxPython to see how they handle this since I
> know that they subclass quite a few things. Unless maybe someone else
> knows?
>
> Regards,
> John
>
It seems wxPython implements wxPyArtProvider and uses it as
wxArtProvider. Related parts from artprov.i is below:
%{ // Python aware wxArtProvider
class wxPyArtProvider : public wxArtProvider {
public:
virtual wxBitmap CreateBitmap(const wxArtID& id,
const wxArtClient& client,
const wxSize& size) {
wxBitmap rval = wxNullBitmap;
wxPyBlock_t blocked = wxPyBeginBlockThreads();
if ((wxPyCBH_findCallback(m_myInst, "CreateBitmap"))) {
PyObject* so = wxPyConstructObject((void*)&size,
wxT("wxSize"), 0);
PyObject* ro;
wxBitmap* ptr;
PyObject* s1, *s2;
s1 = wx2PyString(id);
s2 = wx2PyString(client);
ro = wxPyCBH_callCallbackObj(m_myInst,
Py_BuildValue("(OOO)", s1, s2, so));
Py_DECREF(so);
Py_DECREF(s1);
Py_DECREF(s2);
if (ro) {
if (wxPyConvertSwigPtr(ro, (void**)&ptr, wxT("wxBitmap")))
rval = *ptr;
Py_DECREF(ro);
}
}
wxPyEndBlockThreads(blocked);
return rval;
}
PYPRIVATE;
};
%}
%rename(ArtProvider) wxPyArtProvider;
class wxPyArtProvider /*: public wxObject*/
{
public:
%pythonAppend wxPyArtProvider setCallbackInfo(ArtProvider);
wxPyArtProvider();
~wxPyArtProvider();
void _setCallbackInfo(PyObject* self, PyObject* _class);
%disownarg( wxPyArtProvider *provider );
...
%cleardisown( wxPyArtProvider *provider );
...
%pythonPrepend Destroy "args[0].this.own(False)"
%extend { void Destroy() { delete self; }}
};
%init %{
wxPyPtrTypeMap_Add("wxArtProvider", "wxPyArtProvider");
%}
--
Regards,
Hakki Dogusan
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