wxEVT_AUINOTEBOOK_BUTTON event broken for wxAuiNotebook (Issue #26801)

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BazaarAcc32

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Aug 8, 2026, 8:47:08 AM (2 days ago) Aug 8

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BazaarAcc32 created an issue (wxWidgets/wxWidgets#26801)

Description

After upgrading from wxWidgets 3.3.0 to 3.3.3, wxEVT_AUINOTEBOOK_BUTTON event
The wxEVT_AUINOTEBOOK_BUTTON event is no longer triggered by wxAuiNotebook. According to the source code, wxAuiNotebook never triggers this event in version 3.3.3.

Expected vs observed behaviour:

I expect that when clicking on tools (both built-in ones like wxAUI_NB_CLOSE_BUTTON and custom ones added via wxAuiTabContainer::AddButton) an wxEVT_AUINOTEBOOK_BUTTON event will be triggered

To Reproduce:

#include <wx/wx.h>
#include <wx/aui/aui.h>

enum { ID_NOTEBOOK = wxID_HIGHEST + 1 };

class MyFrame : public wxFrame
{
public:
    MyFrame()
        : wxFrame(nullptr, wxID_ANY, "AuiNotebook button", wxDefaultPosition, wxSize(800, 500))
    {
        auto* notebook = new wxAuiNotebook(this, ID_NOTEBOOK, wxDefaultPosition, wxDefaultSize,
            wxAUI_NB_DEFAULT_STYLE | wxAUI_NB_CLOSE_BUTTON | wxAUI_NB_WINDOWLIST_BUTTON);

        notebook->AddPage(new wxPanel(notebook), "First page");
        notebook->AddPage(new wxPanel(notebook), "Second page");

        notebook->Bind(wxEVT_AUINOTEBOOK_BUTTON, &MyFrame::OnNotebookButton, this);
    }

private:
    void OnNotebookButton(wxAuiNotebookEvent& event)
    {
        const int button = event.GetInt();

        if (button == wxAUI_BUTTON_CLOSE)
        {
            wxLogMessage("Close button clicked");
        }

        event.Skip();
    }
};

class MyApp : public wxApp
{
public:
    bool OnInit() override
    {
        auto* frame = new MyFrame();
        frame->Show();
        return true;
    }
};

wxIMPLEMENT_APP(MyApp);

Platform and version information

wxWidgets version you use: 3.3.3
wxWidgets port you use: wxMSW
OS and its version: Windows 11
- Current theme:

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VZ

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Aug 9, 2026, 1:16:03 PM (13 hours ago) Aug 9

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vadz left a comment (wxWidgets/wxWidgets#26801)

This was broken by 48bf1ac (Rewrite event generation and propagation in wxAuiNotebook, 2025-07-12), as I didn't realize that it was a public event. This will need to be restored, without reintroducing the original problem from #25544.