Method setupItemsGroupConfig_

source/MRViewer/MRRibbonMenu.cpp:1353–1469

RibbonMenu::DrawTabConfig RibbonMenu::setupItemsGroupConfig_( const std::vector<std::string>& groupsInTab,
                                                              const std::string& tabName, bool centerItems )
{
    DrawTabConfig res( groupsInTab.size() );
    const auto& style = ImGui::GetStyle();
    const float screenWidth = float( getViewerInstance().framebufferSize.x ) - ( ImGui::GetCursorScreenPos().x - ImGui::GetMainViewport()->Pos.x ) -
        ( float( groupsInTab.size() ) + 1.0f ) * UI::scale();
    std::vector<float> groupWidths( groupsInTab.size() );
    float sumWidth = 0.0f;

    auto calcGroupWidth = [&] ( const MenuItemsList& items, DrawGroupConfig config )->float
    {
        assert( config.numBig + config.numSmallText + config.numSmall == items.size() );
        float resWidth = 0.0f;
        for ( int i = 0; i < items.size();)
        {
            if ( config.numBig > 0 )
            {
                auto itemIt = RibbonSchemaHolder::schema().items.find( items[i] );
                ++i;
                --config.numBig;
                if ( itemIt == RibbonSchemaHolder::schema().items.end() )
                    continue; // TODO: asserts or log
                resWidth += buttonDrawer_.calcItemWidth( itemIt->second, DrawButtonParams::SizeType::Big ).baseWidth;
                resWidth += style.ItemSpacing.x;
                continue;
            }
            else
            {
                bool smallText = config.numSmallText > 0;
                assert( smallText || config.numSmall > 0 );
                auto& num = smallText ? config.numSmallText : config.numSmall;
                int n = std::min( 3, num );
                float maxWidth = 0.0f;
                for ( int j = i; j < i + n; ++j )
                {
                    auto itemIt = RibbonSchemaHolder::schema().items.find( items[j] );
                    if ( itemIt == RibbonSchemaHolder::schema().items.end() )
                        continue; // TODO: asserts or log
                    auto width = buttonDrawer_.calcItemWidth( itemIt->second,
                                                              smallText ?
                                                              DrawButtonParams::SizeType::SmallText :
                                                              DrawButtonParams::SizeType::Small );
                    maxWidth = std::max( width.baseWidth + width.additionalWidth, maxWidth );
                }
                resWidth += maxWidth;
                i += n;
                num -= n;
                resWidth += style.ItemSpacing.x;
                continue;
            }
        }
        resWidth += 2.0f * style.CellPadding.x;
        resWidth -= style.ItemSpacing.x; // remove one last spacing
        return resWidth;
    };

    for ( int i = 0; i < groupsInTab.size(); ++i )