Re: wxAuiNotebook, changing the close button bitmap?

Hi,

*Disclaimer: I know little about wxAUI, just took a look at the sources, 
and I am Windows only.*

Replacing close button bitmaps in wxAuiSimpleTabArt is very simple but more 
complicated with wxAuiDefaultTabArt. wxAuiDefaultTabArt differs between 
platforms 
<https://github.com/wxWidgets/wxWidgets/blob/14f6f82e46641ef226b23143c1f44570c769176b/include/wx/aui/tabart.h#L320>, 
e.g., it actually is wxAuiMSWTabArt on Windows which uses native theme API 
to draw the button.

Anyway, I tried if using a custom art for the tab works, writing a 
proof-of-concept code using a help bitmap as the close button (same for 
active and disabled), borrowing the draw methods from the generic tab art 
when needed, not caring about how it looks:
[image: wx-auintb-art.png]

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

class MyAuiSimpleTabArt : public wxAuiSimpleTabArt
{
public:
    MyAuiSimpleTabArt(const wxBitmapBundle& activeCloseBmp, const 
wxBitmapBundle& disabledCloseBmp)
    {
        m_activeCloseBmp = activeCloseBmp;
        m_disabledCloseBmp = disabledCloseBmp;
    }

    wxAuiTabArt* Clone()
    {
        return new MyAuiSimpleTabArt(*this);
    }
};

class MyAuiDefaultTabArt : public wxAuiDefaultTabArt
{
public:
    MyAuiDefaultTabArt(const wxBitmapBundle& activeCloseBmp, const 
wxBitmapBundle& disabledCloseBmp)
    {
        m_activeCloseBmp = activeCloseBmp;
        m_disabledCloseBmp = disabledCloseBmp;
    }

    // This draws the "Close active tab" button on the far right
    void DrawButton(wxDC& dc, wxWindow* wnd, const wxRect& in_rect, int 
bitmap_id, int button_state, int orientation, wxRect* out_rect) override
    {
        // for testing, use generic version
        wxAuiGenericTabArt::DrawButton(dc, wnd, in_rect, bitmap_id, 
button_state, orientation, out_rect);
    }

    void DrawTab(wxDC& dc, wxWindow* wnd, const wxAuiNotebookPage& page, 
const wxRect& in_rect, int close_button_state, wxRect* out_tab_rect, 
wxRect* out_button_rect, int* x_extent) override
    {
        // for testing, use generic version
        wxAuiGenericTabArt::DrawTab(dc, wnd, page, in_rect, 
close_button_state, out_tab_rect, out_button_rect, x_extent);
    }

    wxAuiTabArt* Clone()
    {
        return new MyAuiDefaultTabArt(*this);
    }
};

class MyFrame : public wxFrame
{
public:
    MyFrame(wxWindow* parent = nullptr) : wxFrame(parent, wxID_ANY, "Test")
    {
        const wxBitmapBundle activeClose = 
wxArtProvider::GetBitmapBundle(wxART_HELP, wxART_OTHER, wxSize(16,16));
        const wxBitmapBundle disabledClose = activeClose;

        wxBoxSizer* mainSizer = new wxBoxSizer(wxVERTICAL);

        mainSizer->Add(AddNotebook(new MyAuiSimpleTabArt(activeClose, 
disabledClose)), wxSizerFlags(1).Expand());
        mainSizer->Add(AddNotebook(new MyAuiDefaultTabArt(activeClose, 
disabledClose)), wxSizerFlags(1).Expand());
        SetSizer(mainSizer);
    }
private:
    wxAuiNotebook* AddNotebook(wxAuiTabArt* tabArt)
    {
        wxAuiNotebook* notebook = new wxAuiNotebook(this, wxID_ANY, 
wxDefaultPosition, wxDefaultSize, wxAUI_NB_CLOSE_BUTTON | 
wxAUI_NB_CLOSE_ON_ALL_TABS | wxAUI_NB_DEFAULT_STYLE);

        notebook->SetArtProvider(tabArt);
        for ( size_t i = 0; i < 10; ++i )
            notebook->AddPage(new wxPanel(notebook), wxString::Format("Page 
%zu", i), false);
        return notebook;
    }
};

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

To conclude, customizing the tab art seems possible but may require some 
effort to look good and work properly on all the platforms.

Regards,
PB

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