Method DockSpaceOverViewport

extern/imgui/imgui.cpp:17251–17280

Tips: Use with ImGuiDockNodeFlags_PassthruCentralNode! The limitation with this call is that your window won't have a menu bar. Even though we could pass window flags, it would also require the user to be able to call BeginMenuBar() somehow meaning we can't Begin/End in a single function. But you can also use BeginMainMenuBar(). If you really want a menu bar inside the same window as the one hosti

// Even though we could pass window flags, it would also require the user to be able to call BeginMenuBar() somehow meaning we can't Begin/End in a single function.
// But you can also use BeginMainMenuBar(). If you really want a menu bar inside the same window as the one hosting the dockspace, you will need to copy this code somewhere and tweak it.
ImGuiID ImGui::DockSpaceOverViewport(const ImGuiViewport* viewport, ImGuiDockNodeFlags dockspace_flags, const ImGuiWindowClass* window_class)
{
    if (viewport == NULL)
        viewport = GetMainViewport();

    SetNextWindowPos(viewport->WorkPos);
    SetNextWindowSize(viewport->WorkSize);
    SetNextWindowViewport(viewport->ID);

    ImGuiWindowFlags host_window_flags = 0;
    host_window_flags |= ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoDocking;
    host_window_flags |= ImGuiWindowFlags_NoBringToFrontOnFocus | ImGuiWindowFlags_NoNavFocus;
    if (dockspace_flags & ImGuiDockNodeFlags_PassthruCentralNode)
        host_window_flags |= ImGuiWindowFlags_NoBackground;

    char label[32];
    ImFormatString(label, IM_ARRAYSIZE(label), "DockSpaceViewport_%08X", viewport->ID);

    PushStyleVar(ImGuiStyleVar_WindowRounding, 0.0f);
    PushStyleVar(ImGuiStyleVar_WindowBorderSize, 0.0f);
    PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(0.0f, 0.0f));
    Begin(label, NULL, host_window_flags);
    PopStyleVar(3);

    ImGuiID dockspace_id = GetID("DockSpace");
    DockSpace(dockspace_id, ImVec2(0.0f, 0.0f), dockspace_flags, window_class);
    End();

    return dockspace_id;
}

//-----------------------------------------------------------------------------
// Docking: Builder Functions