Method update

source/MRViewer/MRImGuiMeasurementIndicators.cpp:138–239

}

void Text::update( bool force ) const
{
    if ( !force && !dirty )
        return; // Nothing to do.
    dirty = false;

    FontAndSize curFont = defaultFont;

    // Compute `elem.computedSize` and `line.computedSize[WithPadding].y`.
    for ( const Line& line : lines )
    {
        line.computedSize.y = 0;

        for ( const Elem& elem : line.elems )
        {
            std::visit( overloaded{
                [&]( const std::string& str )
                {
                    if ( curFont.first )
                        ImGui::PushFont( curFont.first, curFont.second );
                    MR_FINALLY{
                        if ( curFont.first )
                            ImGui::PopFont();
                    };

                    elem.computedSize = round( ImGui::CalcTextSize( str.c_str() ) );
                },
                [&]( TextIcon )
                {
                    // Just this for now.
                    elem.computedSize.x = elem.computedSize.y = std::round( ImGui::GetTextLineHeight() );
                },
                [&]( const TextColor& )
                {
                    elem.computedSize = ImVec2();
                },
                [&]( const TextFont& font )
                {
                    elem.computedSize = ImVec2();
                    curFont = { font.font, font.size };
                },
            }, elem.var );

            if ( elem.computedSize.y > line.computedSize.y )
                line.computedSize.y = elem.computedSize.y;
        }

        line.computedSizeWithPadding.y = std::max( line.computedSize.y, line.size.y );
    }

    float columnWidths[32]{};

    // Compute `elem.computedSizeWithPadding` (here Y requires knowing line heights, and X could've been computed earlier).
    // Also compute initial `computedSizeWithPadding` for elements, before the column alignment.
    for ( const Line& line : lines )
    {
        for ( const Elem& elem : line.elems )
        {