private void UpdateSplitterVisibility()

in src/StructuredLogViewer/Controls/SplitterPanel.cs [187:252]
59 lines of code
18 McCabe index (conditional complexity)

        private void UpdateSplitterVisibility()
        {
            bool isFirstChildVisible = FirstChild != null && FirstChild.IsVisible;
            bool isSecondChildVisible = SecondChild != null && SecondChild.IsVisible;
            bool areBothVisible = isFirstChildVisible && isSecondChildVisible;
            gridSplitter.Visibility = areBothVisible ? Visibility.Visible : Visibility.Collapsed;

            if (Orientation == Orientation.Horizontal)
            {
                if (ColumnDefinitions.Count == 3)
                {
                    if (isFirstChildVisible)
                    {
                        if (oldFirstSize == default(GridLength) || oldFirstSize == zero)
                        {
                            oldFirstSize = FirstChildRelativeSize;
                        }

                        if (ColumnDefinitions[0].Width == zero)
                        {
                            ColumnDefinitions[0].Width = oldFirstSize;
                        }
                    }
                    else
                    {
                        if (ColumnDefinitions[0].Width != zero)
                        {
                            oldFirstSize = ColumnDefinitions[0].Width;
                        }

                        ColumnDefinitions[0].Width = zero;
                    }

                    if (areBothVisible)
                    {
                        ColumnDefinitions[1].Width = separatorSize;
                    }
                    else
                    {
                        ColumnDefinitions[1].Width = zero;
                    }

                    if (isSecondChildVisible)
                    {
                        if (oldSecondSize == default(GridLength) || oldSecondSize == zero)
                        {
                            oldSecondSize = SecondChildRelativeSize;
                        }

                        if (ColumnDefinitions[2].Width == zero)
                        {
                            ColumnDefinitions[2].Width = oldSecondSize;
                        }
                    }
                    else
                    {
                        if (ColumnDefinitions[2].Width != zero)
                        {
                            oldSecondSize = ColumnDefinitions[2].Width;
                        }

                        ColumnDefinitions[2].Width = zero;
                    }
                }
            }
        }