Method BeginTabBarEx

tutorials/common/imgui/imgui_widgets.cpp:7373–7429

}

bool    ImGui::BeginTabBarEx(ImGuiTabBar* tab_bar, const ImRect& tab_bar_bb, ImGuiTabBarFlags flags)
{
    ImGuiContext& g = *GImGui;
    ImGuiWindow* window = g.CurrentWindow;
    if (window->SkipItems)
        return false;

    if ((flags & ImGuiTabBarFlags_DockNode) == 0)
        PushOverrideID(tab_bar->ID);

    // Add to stack
    g.CurrentTabBarStack.push_back(GetTabBarRefFromTabBar(tab_bar));
    g.CurrentTabBar = tab_bar;

    // Append with multiple BeginTabBar()/EndTabBar() pairs.
    tab_bar->BackupCursorPos = window->DC.CursorPos;
    if (tab_bar->CurrFrameVisible == g.FrameCount)
    {
        window->DC.CursorPos = ImVec2(tab_bar->BarRect.Min.x, tab_bar->BarRect.Max.y + tab_bar->ItemSpacingY);
        tab_bar->BeginCount++;
        return true;
    }

    // Ensure correct ordering when toggling ImGuiTabBarFlags_Reorderable flag, or when a new tab was added while being not reorderable
    if ((flags & ImGuiTabBarFlags_Reorderable) != (tab_bar->Flags & ImGuiTabBarFlags_Reorderable) || (tab_bar->TabsAddedNew && !(flags & ImGuiTabBarFlags_Reorderable)))
        ImQsort(tab_bar->Tabs.Data, tab_bar->Tabs.Size, sizeof(ImGuiTabItem), TabItemComparerByBeginOrder);
    tab_bar->TabsAddedNew = false;

    // Flags
    if ((flags & ImGuiTabBarFlags_FittingPolicyMask_) == 0)
        flags |= ImGuiTabBarFlags_FittingPolicyDefault_;

    tab_bar->Flags = flags;
    tab_bar->BarRect = tab_bar_bb;
    tab_bar->WantLayout = true; // Layout will be done on the first call to ItemTab()
    tab_bar->PrevFrameVisible = tab_bar->CurrFrameVisible;
    tab_bar->CurrFrameVisible = g.FrameCount;
    tab_bar->PrevTabsContentsHeight = tab_bar->CurrTabsContentsHeight;
    tab_bar->CurrTabsContentsHeight = 0.0f;
    tab_bar->ItemSpacingY = g.Style.ItemSpacing.y;
    tab_bar->FramePadding = g.Style.FramePadding;
    tab_bar->TabsActiveCount = 0;
    tab_bar->BeginCount = 1;

    // Set cursor pos in a way which only be used in the off-chance the user erroneously submits item before BeginTabItem(): items will overlap
    window->DC.CursorPos = ImVec2(tab_bar->BarRect.Min.x, tab_bar->BarRect.Max.y + tab_bar->ItemSpacingY);

    // Draw separator
    const ImU32 col = GetColorU32((flags & ImGuiTabBarFlags_IsFocused) ? ImGuiCol_TabActive : ImGuiCol_TabUnfocusedActive);
    const float y = tab_bar->BarRect.Max.y - 1.0f;
    {
        const float separator_min_x = tab_bar->BarRect.Min.x - IM_FLOOR(window->WindowPadding.x * 0.5f);
        const float separator_max_x = tab_bar->BarRect.Max.x + IM_FLOOR(window->WindowPadding.x * 0.5f);
        window->DrawList->AddLine(ImVec2(separator_min_x, y), ImVec2(separator_max_x, y), col, 1.0f);
    }
    return true;
}