[wxperl-users] Document/View Framework

[Simon F. <sim...@bb...>]

Hi,

I am working on implimenting wxWindows' doc/view framework in wxPerl. I've
got about 95% of the XS done and it compiles ok, but I'm having a problem
with wxDocTemplate/wxClassInfo.

The wxDocTemplate constructor looks like this:

   Wx_DocTemplate *
   Wx_DocTemplate::new(manager, descr, filter, dir, ext, docTypeName,
                       viewTypeName, docClassInfo, viewClassInfo, flags)
       Wx_DocManager* manager
       wxString descr
       wxString filter
       wxString dir
       wxString ext
       wxString docTypeName
       wxString viewTypeName
       Wx_ClassInfo* docClassInfo
       Wx_ClassInfo* viewClassInfo
       long flags

The wxDocTemplate needs wxClassInfo objects for the document and view
classes, so it can create the documents/views automatically when they are
needed. I think this probably works ok if I use c++ classes it already knows
about such as wxDocument and wxView. Obviously wxClassInfo doesn't know
anything about perl classes, so I can't create a classinfo object for
"MyDocument" and "MyView".

At the moment, I've got this in my test script:

    my $ci_doc = Wx::ClassInfo::FindClass("wxDocument");
    my $ci_view = Wx::ClassInfo::FindClass("wxView");
    my $docmanager = Wx::DocManager->new( 1, 1 );
    my $doctemplate = Wx::DocTemplate->new($docmanager, "XML", "*.xml", "",
                                          "xml", "MyDoc", "MyView", $ci_doc,
                                          $ci_view, 1 );
    my $frame = new Wx::DocParentFrame($docmanager, undef, -1, "DocView
Demo",
                                      wxDefaultPosition, wxDefaultSize,
                                      wxDEFAULT_FRAME_STYLE);


So far I'm getting encouraging results for Wx::DocManager. When I click on
File -> Open, it automatically pops up a file selector for *.xml files. But
when I try and open one it crashes. I think this is because
wxView::OnCreate() isn't doing anything.

What I'd like to be able to do is something like this:

    my $ci_doc = Wx::ClassInfo::FindClass("My::Document");
    my $ci_view = Wx::ClassInfo::FindClass("My::View");

Although we might need a different method name so we can still handle c++
classes in the same way. My problem is that I don't know how to impliment
this. We'd need to override Wx::ClassInfo->CreateObject() or
wxClassInfo::m_objectConstructor.

I don't think I'm experienced enough to do this, but even if I were, I'd
want to make sure that I did it in a way that was compatible with wxPerl
development. 

If I can get this working I'll submit a patch to add the document/view
framework. If not, I'll give you what I've done so far so you don't need to
repeat what I've already done.

By the way Mattia, I'm interested to know what the wxPl...... classes are
for? Do we need something like that here? It looks like there are some
useful functions in cpp/helpers.cpp

Let me know if you want me to send you what I've got so far.

Thanks
Simon









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