WeiranZhang.Metropaper.Controls.NewHtmlBlock.AddTextBox C# (CSharp) Method

        private void AddTextBox(HtmlNode node, int leftMargin = 0, int topMargin = 0, int rightMargin = 0, int bottomMargin = 0)
        {
            int _leftMargin = 0, _rightMargin = 0, _topMargin = 0, _bottomMargin = 0;
            _currentTextBox = new RichTextBox();

            if (node != null)
            {
                switch (node.Name.ToLower())
                {
                    case "h1":
                    case "h2":
                    case "h3":
                    case "h4":
                        _topMargin = 20;
                        _bottomMargin = 10;
                        break;
                    case "p":
                        _bottomMargin = 20;
                        break;
                    default:
                        break;
                }
            }

            if (_currentlyInBlockquote)
            {
                _leftMargin = 20;
                _rightMargin = 20;
            }

            _currentTextBox.Background = Background;
            _currentTextBox.FontFamily = FontFamily;
            _currentTextBox.FontSize = FontSize;
            _currentTextBox.FontStretch = FontStretch;
            _currentTextBox.FontWeight = FontWeight;
            _currentTextBox.Margin = new Thickness(leftMargin + _leftMargin,
                                                   topMargin + _topMargin,
                                                   rightMargin + _rightMargin,
                                                   bottomMargin + _bottomMargin);

            _textBoxes.Add(_currentTextBox);
            _itemsControl.Items.Add(_currentTextBox);
        }