/// <summary>
/// Gets a borders object that should be used for rendering.
/// </summary>
/// <exception cref="System.ArgumentException">
/// Thrown when the cell is not in this list.
/// This situation occurs if the given cell is merged "away" by a previous one.
/// </exception>
public Borders GetEffectiveBorders(Cell cell)
{
CellInfo cellInfo = this.CellIndex[cell] as CellInfo;
if (cellInfo == null)
{
throw new ArgumentException("cell is not a relevant cell", "cell");
}
if (cellInfo.Borders == null)
{
Borders borders = GetCellBorders(cell);
if (borders != null)
{
Document doc = borders.Document;
borders = borders.Clone();
borders.parent = cell;
doc = borders.Document;
}
else
{
borders = new Borders(cell.parent);
}
if (cell.mergeRight > 0)
{
Cell rightBorderCell = cell.Table[cell.Row.Index, cell.Column.Index + cell.mergeRight];
if (rightBorderCell.borders != null && rightBorderCell.borders.right != null)
{
borders.Right = rightBorderCell.borders.right.Clone();
}
else
{
borders.right = null;
}
}
if (cell.mergeDown > 0)
{
Cell bottomBorderCell = cell.Table[cell.Row.Index + cell.mergeDown, cell.Column.Index];
if (bottomBorderCell.borders != null && bottomBorderCell.borders.bottom != null)
{
borders.Bottom = bottomBorderCell.borders.bottom.Clone();
}
else
{
borders.bottom = null;
}
}
Cell leftNeighbor = GetNeighbor(cellInfo, NeighborPosition.Left);
Cell rightNeighbor = GetNeighbor(cellInfo, NeighborPosition.Right);
Cell topNeighbor = GetNeighbor(cellInfo, NeighborPosition.Top);
Cell bottomNeighbor = GetNeighbor(cellInfo, NeighborPosition.Bottom);
if (leftNeighbor != null)
{
Borders nbrBrdrs = GetCellBorders(leftNeighbor);
if (nbrBrdrs != null &&
GetEffectiveBorderWidth(nbrBrdrs, BorderType.Right) >= GetEffectiveBorderWidth(borders, BorderType.Left))
{
borders.SetValue("Left", GetBorderFromBorders(nbrBrdrs, BorderType.Right));
}
}
if (rightNeighbor != null)
{
Borders nbrBrdrs = GetCellBorders(rightNeighbor);
if (nbrBrdrs != null &&
GetEffectiveBorderWidth(nbrBrdrs, BorderType.Left) > GetEffectiveBorderWidth(borders, BorderType.Right))
{
borders.SetValue("Right", GetBorderFromBorders(nbrBrdrs, BorderType.Left));
}
}
if (topNeighbor != null)
{
Borders nbrBrdrs = GetCellBorders(topNeighbor);
if (nbrBrdrs != null &&
GetEffectiveBorderWidth(nbrBrdrs, BorderType.Bottom) >= GetEffectiveBorderWidth(borders, BorderType.Top))
{
borders.SetValue("Top", GetBorderFromBorders(nbrBrdrs, BorderType.Bottom));
}
}
if (bottomNeighbor != null)
{
Borders nbrBrdrs = GetCellBorders(bottomNeighbor);
if (nbrBrdrs != null &&
GetEffectiveBorderWidth(nbrBrdrs, BorderType.Top) > GetEffectiveBorderWidth(borders, BorderType.Bottom))
{
borders.SetValue("Bottom", GetBorderFromBorders(nbrBrdrs, BorderType.Top));
}
}
cellInfo.Borders = borders;
}
return(cellInfo.Borders);
}