/// <summary>
/// Gets the available width for the whole table.
/// It also sets the value of <see cref="WidthSpecified"/>
/// </summary>
/// <returns></returns>
/// <remarks>
/// The table's width can be larger than the result of this method, because of the minimum
/// size that individual boxes.
/// </remarks>
private float GetAvailableWidth()
{
CssLength tblen = new CssLength(TableBox.Width);
if (tblen.Number > 0)
{
_widthSpecified = true;
if (tblen.IsPercentage)
{
return(CssValue.ParseNumber(tblen.Length, TableBox.ParentBox.AvailableWidth));
}
else
{
return(tblen.Number);
}
}
else
{
return(TableBox.ParentBox.AvailableWidth);
}
}
/// <summary>
/// Gets the white space width of the specified box
/// </summary>
/// <param name="g"></param>
/// <param name="b"></param>
/// <returns></returns>
public static float WhiteSpace(Graphics g, CssBox b)
{
string space = " .";
float w = 0f;
float onError = 5f;
StringFormat sf = new StringFormat();
sf.SetMeasurableCharacterRanges(new CharacterRange[] { new CharacterRange(0, 1) });
Region[] regs = g.MeasureCharacterRanges(space, b.ActualFont, new RectangleF(0, 0, float.MaxValue, float.MaxValue), sf);
if (regs == null || regs.Length == 0)
{
return(onError);
}
w = regs[0].GetBounds(g).Width;
if (!(string.IsNullOrEmpty(b.WordSpacing) || b.WordSpacing == CssConstants.Normal))
{
w += CssValue.ParseLength(b.WordSpacing, 0, b);
}
return(w);
}
/// <summary>
/// Gets the span attribute of the tag of the specified box
/// </summary>
/// <param name="b"></param>
private int GetSpan(CssBox b)
{
float f = CssValue.ParseNumber(b.GetAttribute("span"), 1);
return(Math.Max(1, Convert.ToInt32(f)));
}
/// <summary>
/// Analyzes the Table and assigns values to this CssTable object.
/// To be called from the constructor
/// </summary>
private void Analyze(Graphics g)
{
float availSpace = GetAvailableWidth();
float availCellSpace = float.NaN; //Will be set later
#region Assign box kinds
foreach (CssBox b in TableBox.Boxes)
{
b.RemoveAnonymousSpaces();
switch (b.Display)
{
case CssConstants.TableCaption:
_caption = b;
break;
case CssConstants.TableColumn:
for (int i = 0; i < GetSpan(b); i++)
{
Columns.Add(CreateColumn(b));
}
break;
case CssConstants.TableColumnGroup:
if (b.Boxes.Count == 0)
{
int gspan = GetSpan(b);
for (int i = 0; i < gspan; i++)
{
Columns.Add(CreateColumn(b));
}
}
else
{
foreach (CssBox bb in b.Boxes)
{
int bbspan = GetSpan(bb);
for (int i = 0; i < bbspan; i++)
{
Columns.Add(CreateColumn(bb));
}
}
}
break;
case CssConstants.TableFooterGroup:
if (FooterBox != null)
{
BodyRows.Add(b);
}
else
{
_footerBox = b;
}
break;
case CssConstants.TableHeaderGroup:
if (HeaderBox != null)
{
BodyRows.Add(b);
}
else
{
_headerBox = b;
}
break;
case CssConstants.TableRow:
BodyRows.Add(b);
break;
case CssConstants.TableRowGroup:
foreach (CssBox bb in b.Boxes)
{
if (b.Display == CssConstants.TableRow)
{
BodyRows.Add(b);
}
}
break;
default:
break;
}
}
#endregion
#region Gather AllRows
if (HeaderBox != null)
{
_allRows.AddRange(HeaderBox.Boxes);
}
_allRows.AddRange(BodyRows);
if (FooterBox != null)
{
_allRows.AddRange(FooterBox.Boxes);
}
#endregion
#region Insert EmptyBoxes for vertical cell spanning
if (!TableBox.TableFixed)
{
int currow = 0;
int curcol = 0;
List <CssBox> rows = BodyRows;
foreach (CssBox row in rows)
{
row.RemoveAnonymousSpaces();
curcol = 0;
for (int k = 0; k < row.Boxes.Count; k++)
{
CssBox cell = row.Boxes[k];
int rowspan = GetRowSpan(cell);
int realcol = GetCellRealColumnIndex(row, cell); //Real column of the cell
for (int i = currow + 1; i < currow + rowspan; i++)
{
int colcount = 0;
for (int j = 0; j <= rows[i].Boxes.Count; j++)
{
if (colcount == realcol)
{
rows[i].Boxes.Insert(colcount, new SpacingBox(TableBox, ref cell, currow));
break;
}
colcount++;
realcol -= GetColSpan(rows[i].Boxes[j]) - 1;
}
} // End for (int i = currow + 1; i < currow + rowspan; i++)
curcol++;
} // End foreach (Box cell in row.Boxes)
currow++;
} // End foreach (Box row in rows)
TableBox.TableFixed = true;
} // End if (!TableBox.TableFixed)
#endregion
#region Determine Row and Column Count, and ColumnWidths
//Rows
_rowCount = BodyRows.Count +
(HeaderBox != null ? HeaderBox.Boxes.Count : 0) +
(FooterBox != null ? FooterBox.Boxes.Count : 0);
//Columns
if (Columns.Count > 0)
{
_columnCount = Columns.Count;
}
else
{
foreach (CssBox b in AllRows) //Check trhough rows
{
_columnCount = Math.Max(_columnCount, b.Boxes.Count);
}
}
//Initialize column widths array
_columnWidths = new float[_columnCount];
//Fill them with NaNs
for (int i = 0; i < _columnWidths.Length; i++)
{
_columnWidths[i] = float.NaN;
}
availCellSpace = GetAvailableCellWidth();
if (Columns.Count > 0)
{
#region Fill ColumnWidths array by scanning column widths
for (int i = 0; i < Columns.Count; i++)
{
CssLength len = new CssLength(Columns[i].Width); //Get specified width
if (len.Number > 0) //If some width specified
{
if (len.IsPercentage) //Get width as a percentage
{
ColumnWidths[i] = CssValue.ParseNumber(Columns[i].Width, availCellSpace);
}
else if (len.Unit == CssLength.CssUnit.Pixels || len.Unit == CssLength.CssUnit.None)
{
ColumnWidths[i] = len.Number; //Get width as an absolute-pixel value
}
}
}
#endregion
}
else
{
#region Fill ColumnWidths array by scanning width in table-cell definitions
foreach (CssBox row in AllRows)
{
//Check for column width in table-cell definitions
for (int i = 0; i < _columnCount; i++)
{
if (float.IsNaN(ColumnWidths[i]) && //Check if no width specified for column
i < row.Boxes.Count && //And there's a box to check
row.Boxes[i].Display == CssConstants.TableCell) //And the box is a table-cell
{
CssLength len = new CssLength(row.Boxes[i].Width); //Get specified width
if (len.Number > 0) //If some width specified
{
int colspan = GetColSpan(row.Boxes[i]);
float flen = 0f;
if (len.IsPercentage)//Get width as a percentage
{
flen = CssValue.ParseNumber(row.Boxes[i].Width, availCellSpace);
}
else if (len.Unit == CssLength.CssUnit.Pixels || len.Unit == CssLength.CssUnit.None)
{
flen = len.Number; //Get width as an absolute-pixel value
}
flen /= Convert.ToSingle(colspan);
for (int j = i; j < i + colspan; j++)
{
ColumnWidths[j] = flen;
}
}
}
}
}
#endregion
}
#endregion
#region Determine missing Column widths
if (WidthSpecified) //If a width was specified,
{
//Assign NaNs equally with space left after gathering not-NaNs
int numberOfNans = 0;
float occupedSpace = 0f;
//Calculate number of NaNs and occuped space
for (int i = 0; i < ColumnWidths.Length; i++)
{
if (float.IsNaN(ColumnWidths[i]))
{
numberOfNans++;
}
else
{
occupedSpace += ColumnWidths[i];
}
}
//Determine width that will be assigned to un asigned widths
float nanWidth = (availCellSpace - occupedSpace) / Convert.ToSingle(numberOfNans);
for (int i = 0; i < ColumnWidths.Length; i++)
{
if (float.IsNaN(ColumnWidths[i]))
{
ColumnWidths[i] = nanWidth;
}
}
}
else
{
//Assign NaNs using full width
float[] _maxFullWidths = new float[ColumnWidths.Length];
//Get the maximum full length of NaN boxes
foreach (CssBox row in AllRows)
{
for (int i = 0; i < row.Boxes.Count; i++)
{
int col = GetCellRealColumnIndex(row, row.Boxes[i]);
if (float.IsNaN(ColumnWidths[col]) &&
i < row.Boxes.Count &&
GetColSpan(row.Boxes[i]) == 1)
{
_maxFullWidths[col] = Math.Max(_maxFullWidths[col], row.Boxes[i].GetFullWidth(g));
}
}
}
for (int i = 0; i < ColumnWidths.Length; i++)
{
if (float.IsNaN(ColumnWidths[i]))
{
ColumnWidths[i] = _maxFullWidths[i];
}
}
}
#endregion
#region Reduce widths if necessary
int curCol = 0;
float reduceAmount = 1f;
//While table width is larger than it should, and width is reductable
while (GetWidthSum() > GetAvailableWidth() && CanReduceWidth())
{
while (!CanReduceWidth(curCol))
{
curCol++;
}
ColumnWidths[curCol] -= reduceAmount;
curCol++;
if (curCol >= ColumnWidths.Length)
{
curCol = 0;
}
}
#endregion
#region Check for minimum sizes (increment widths if necessary)
foreach (CssBox row in AllRows)
{
foreach (CssBox cell in row.Boxes)
{
int colspan = GetColSpan(cell);
int col = GetCellRealColumnIndex(row, cell);
int affectcol = col + colspan - 1;
if (ColumnWidths[col] < ColumnMinWidths[col])
{
float diff = ColumnMinWidths[col] - ColumnWidths[col];
ColumnWidths[affectcol] = ColumnMinWidths[affectcol];
if (col < ColumnWidths.Length - 1)
{
ColumnWidths[col + 1] -= diff;
}
}
}
}
#endregion
#region Set table padding
TableBox.Padding = "0"; //Ensure there's no padding
#endregion
#region Layout cells
//Actually layout cells!
float startx = TableBox.ClientLeft + HorizontalSpacing;
float starty = TableBox.ClientTop + VerticalSpacing;
float curx = startx;
float cury = starty;
float maxRight = startx;
float maxBottom = 0f;
int currentrow = 0;
foreach (CssBox row in AllRows)
{
if (row is CssAnonymousSpaceBlockBox || row is CssAnonymousSpaceBox)
{
continue;
}
curx = startx;
curCol = 0;
foreach (CssBox cell in row.Boxes)
{
if (curCol >= ColumnWidths.Length)
{
break;
}
int rowspan = GetRowSpan(cell);
float width = GetCellWidth(GetCellRealColumnIndex(row, cell), cell);
cell.Location = new PointF(curx, cury);
cell.Size = new SizeF(width, 0f);
cell.MeasureBounds(g); //That will automatically set the bottom of the cell
//Alter max bottom only if row is cell's row + cell's rowspan - 1
SpacingBox sb = cell as SpacingBox;
if (sb != null)
{
if (sb.EndRow == currentrow)
{
maxBottom = Math.Max(maxBottom, sb.ExtendedBox.ActualBottom);
}
}
else if (rowspan == 1)
{
maxBottom = Math.Max(maxBottom, cell.ActualBottom);
}
maxRight = Math.Max(maxRight, cell.ActualRight);
curCol++;
curx = cell.ActualRight + HorizontalSpacing;
}
foreach (CssBox cell in row.Boxes)
{
SpacingBox spacer = cell as SpacingBox;
if (spacer == null && GetRowSpan(cell) == 1)
{
cell.ActualBottom = maxBottom;
CssLayoutEngine.ApplyCellVerticalAlignment(g, cell);
}
else if (spacer != null && spacer.EndRow == currentrow)
{
spacer.ExtendedBox.ActualBottom = maxBottom;
CssLayoutEngine.ApplyCellVerticalAlignment(g, spacer.ExtendedBox);
}
}
cury = maxBottom + VerticalSpacing;
currentrow++;
}
TableBox.ActualRight = maxRight + HorizontalSpacing + TableBox.ActualBorderRightWidth;
TableBox.ActualBottom = maxBottom + VerticalSpacing + TableBox.ActualBorderBottomWidth;
#endregion
}
/// <summary>
/// Creates a new CssLength from a length specified on a CSS style sheet or fragment
/// </summary>
/// <param name="length">Length as specified in the Style Sheet or style fragment</param>
public CssLength(string length)
{
_length = length;
_number = 0f;
_unit = CssUnit.None;
_isPercentage = false;
//Return zero if no length specified, zero specified
if (string.IsNullOrEmpty(length) || length == "0")
{
return;
}
//If percentage, use ParseNumber
if (length.EndsWith("%", StringComparison.Ordinal))
{
_number = CssValue.ParseNumber(length, 1);
_isPercentage = true;
return;
}
//If no units, has error
if (length.Length < 3)
{
float.TryParse(length, out _number);
_hasError = true;
return;
}
//Get units of the length
string u = length.Substring(length.Length - 2, 2);
//Number of the length
string number = length.Substring(0, length.Length - 2);
//TODO: Units behave different in paper and in screen!
switch (u)
{
case CssConstants.Em:
_unit = CssUnit.Ems;
_isRelative = true;
break;
case CssConstants.Ex:
_unit = CssUnit.Ex;
_isRelative = true;
break;
case CssConstants.Px:
_unit = CssUnit.Pixels;
_isRelative = true;
break;
case CssConstants.Mm:
_unit = CssUnit.Milimeters;
break;
case CssConstants.Cm:
_unit = CssUnit.Centimeters;
break;
case CssConstants.In:
_unit = CssUnit.Inches;
break;
case CssConstants.Pt:
_unit = CssUnit.Points;
break;
case CssConstants.Pc:
_unit = CssUnit.Picas;
break;
default:
_hasError = true;
return;
}
if (!float.TryParse(number, System.Globalization.NumberStyles.Number, NumberFormatInfo.InvariantInfo, out _number))
{
_hasError = true;
}
}