Method TabItemEx

core/src/imgui/imgui_widgets.cpp:7707–7918

}

bool    ImGui::TabItemEx(ImGuiTabBar* tab_bar, const char* label, bool* p_open, ImGuiTabItemFlags flags)
{
    // Layout whole tab bar if not already done
    if (tab_bar->WantLayout)
        TabBarLayout(tab_bar);

    ImGuiContext& g = *GImGui;
    ImGuiWindow* window = g.CurrentWindow;
    if (window->SkipItems)
        return false;

    const ImGuiStyle& style = g.Style;
    const ImGuiID id = TabBarCalcTabID(tab_bar, label);

    // If the user called us with *p_open == false, we early out and don't render.
    // We make a call to ItemAdd() so that attempts to use a contextual popup menu with an implicit ID won't use an older ID.
    IMGUI_TEST_ENGINE_ITEM_INFO(id, label, window->DC.LastItemStatusFlags);
    if (p_open && !*p_open)
    {
        PushItemFlag(ImGuiItemFlags_NoNav | ImGuiItemFlags_NoNavDefaultFocus, true);
        ItemAdd(ImRect(), id);
        PopItemFlag();
        return false;
    }

    IM_ASSERT(!p_open || !(flags & ImGuiTabItemFlags_Button));
    IM_ASSERT((flags & (ImGuiTabItemFlags_Leading | ImGuiTabItemFlags_Trailing)) != (ImGuiTabItemFlags_Leading | ImGuiTabItemFlags_Trailing)); // Can't use both Leading and Trailing

    // Store into ImGuiTabItemFlags_NoCloseButton, also honor ImGuiTabItemFlags_NoCloseButton passed by user (although not documented)
    if (flags & ImGuiTabItemFlags_NoCloseButton)
        p_open = NULL;
    else if (p_open == NULL)
        flags |= ImGuiTabItemFlags_NoCloseButton;

    // Calculate tab contents size
    ImVec2 size = TabItemCalcSize(label, p_open != NULL);

    // Acquire tab data
    ImGuiTabItem* tab = TabBarFindTabByID(tab_bar, id);
    bool tab_is_new = false;
    if (tab == NULL)
    {
        tab_bar->Tabs.push_back(ImGuiTabItem());
        tab = &tab_bar->Tabs.back();
        tab->ID = id;
        tab->Width = size.x;
        tab_bar->TabsAddedNew = true;
        tab_is_new = true;
    }
    tab_bar->LastTabItemIdx = (ImS16)tab_bar->Tabs.index_from_ptr(tab);
    tab->ContentWidth = size.x;
    tab->BeginOrder = tab_bar->TabsActiveCount++;

    const bool tab_bar_appearing = (tab_bar->PrevFrameVisible + 1 < g.FrameCount);
    const bool tab_bar_focused = (tab_bar->Flags & ImGuiTabBarFlags_IsFocused) != 0;
    const bool tab_appearing = (tab->LastFrameVisible + 1 < g.FrameCount);
    const bool is_tab_button = (flags & ImGuiTabItemFlags_Button) != 0;
    tab->LastFrameVisible = g.FrameCount;