void HighlightLineNumberingArea(LayoutColumn column, int leftBoundary)
{
LayoutPage page = column.GetParentByType <LayoutPage>();
Rectangle marginBounds = new Rectangle(new Point(leftBoundary, 0), new Size(column.Bounds.X - leftBoundary, page.Bounds.Height));
Canvas.FillRectangle(new RichEditBrush(NumberingHighlightColor), marginBounds);
}
public override void DrawColumn(LayoutColumn column)
{
LayoutPageArea pageArea = column.GetParentByType <LayoutPageArea>();
if (pageArea != null)
{
int leftBoundary = 0;
if (previousColumnIndex >= 0)
{
leftBoundary = pageArea.Columns[previousColumnIndex].Bounds.Right;
}
if (column.LineNumbers.Count > 0)
{
HighlightLineNumberingArea(column, leftBoundary);
}
previousColumnIndex++;
}
base.DrawColumn(column);
}
