Re: problem with the scrollbar inside the notebook

On Thu, 24 Oct 2024 13:59:30 +0200 Zoran Bošnjak wrote:

ZB> I am using wxHaskell bindings of the wxWidgets library. With the latest 
ZB> version, I am facing the problem with missing scrollbar inside the 
ZB> notebook. The same sample from a few years back was working fine. I 
ZB> belive the wxWidget version was 2.9.3 at the time. Now, it's build 
ZB> against version 3.2.
ZB> 
ZB> The issue (together with a short sample in haskell language) is filed 
ZB> under the wxHaskell project:
ZB> https://codeberg.org/wxHaskell/wxHaskell/issues/48
ZB> 
ZB> I was wandering is someone from this list is able to recreate the same 
ZB> sample as a plain C/C++ program or using other language bindings (like 
ZB> python) and help me determine:

 I am not sure how does "fill" and some other functions work in wxHaskell
but here is a rough translation of your code in C++:

--------------------------------- >8 --------------------------------------
#include <wx/app.h>
#include <wx/frame.h>
#include <wx/notebook.h>
#include <wx/scrolwin.h>
#include <wx/sizer.h>
#include <wx/stattext.h>

class TestApp : public wxApp {
public:
    bool OnInit() override {
        auto f = new wxFrame(nullptr, wxID_ANY, "Frame");
        auto nb = new wxNotebook(f, wxID_ANY);

        auto p1 = new wxScrolledWindow(nb);
        p1->SetScrollRate(20, 20);
        auto sizer = new wxBoxSizer(wxVERTICAL);
        for ( int i = 0; i < 20; i++ ) {
            sizer->Add(new wxStaticText(p1, wxID_ANY, "test " + std::to_string(i)));
        }
        p1->SetSizer(sizer);

        nb->AddPage(p1, "tab1");
        f->SetClientSize(400, 200);
        f->Show();
        return true;
    }
};

wxIMPLEMENT_APP(TestApp);
--------------------------------- >8 --------------------------------------

This works just fine for me with the latest wx and GTK 3.

ZB> - Is this a wxWidget or wxHaskell binding problem?

 I'd check the implementation of "fill" to understand what exactly it does.

ZB> - Was there any change in wxWidgets over time that requires a different 
ZB> approach (like any new attributes regarding the scrollbar)?

 No, or at least definitely not intentionally.

ZB> - Or any other ideas how to workaround the problem and have the 
ZB> scrollbar present again?

 You should try debugging (either using gdb, which should work for C++ code
even when using wxHaskell, or using printf-debugging style) the sizes of
the different windows, e.g. start by checking the size and the virtual size
of "p1".

 Good luck
VZ

-- 
TT-Solutions: wxWidgets consultancy and technical support
              https://www.tt-solutions.com/

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