Example of defining a custom dock art provider

aui-dockart.cpp

#include <wx/app.h>
#include <wx/dc.h>
#include <wx/frame.h>
#include <wx/panel.h>
#include <wx/sizer.h>
#include <wx/textctrl.h>

#include <wx/aui/aui.h>

class TestDockArt : public wxAuiDefaultDockArt {
public:
    void DrawCaption(wxDC& dc,
                     wxWindow* window,
                     const wxString& text,
                     const wxRect& rect,
                     wxAuiPaneInfo& pane)
    {
        dc.SetBrush(*wxBLUE);
        dc.DrawRectangle(rect);
        dc.SetTextForeground(*wxYELLOW);
        dc.DrawText(text, rect.x + window->FromDIP(5), rect.y);
    }
};

class TestPanel : public wxPanel {
public:
    explicit TestPanel(wxWindow* parent) : wxPanel(parent, wxID_ANY) {
        m_manager.SetManagedWindow(this);

        m_manager.SetArtProvider(new TestDockArt);

        m_manager.AddPane(new wxTextCtrl(this, wxID_ANY, "Central pane"), wxAuiPaneInfo().CenterPane());
        m_manager.AddPane(new wxTextCtrl(this, wxID_ANY, "Left pane"), wxAuiPaneInfo().Left().Layer(1).MinSize(FromDIP(wxSize(200, 100))).Caption("Left pane").CloseButton());
        m_manager.AddPane(new wxTextCtrl(this, wxID_ANY, "Bottom pane"), wxAuiPaneInfo().Bottom().Layer(2).MinSize(FromDIP(wxSize(200, 100))).Caption("Bottom pane").MaximizeButton());
        m_manager.Update();
    }

private:
    wxAuiManager m_manager;
};

class TestApp : public wxApp {
public:
    bool OnInit() override {
        auto f = new wxFrame(nullptr, wxID_ANY, "Window containing AUI panel");
        auto t = new wxTextCtrl(f, wxID_ANY, "Just a text", wxDefaultPosition, wxDefaultSize, wxTE_MULTILINE);
        auto p = new TestPanel(f);
        auto s = new wxBoxSizer(wxHORIZONTAL);
        s->Add(t, wxSizerFlags().Expand());
        s->Add(p, wxSizerFlags(1).Expand());
        f->SetSizer(s);
        f->SetClientSize(f->FromDIP(wxSize(800, 600)));

        f->Show();
        return true;
    }
};

wxIMPLEMENT_APP(TestApp);