/// <summary>
/// The height of a block of lines within TextBox not excedding request height.
/// </summary>
/// <param name="LineStart">Start line</param>
/// <param name="LineEnd">End line</param>
/// <param name="RequestHeight">Requested height</param>
/// <param name="LineExtraSpace">Extra line space.</param>
/// <param name="ParagraphExtraSpace">Extra paragraph space.</param>
/// <returns>Height</returns>
/// <remarks>
/// LineStart will be adjusted forward to skip blank lines. LineEnd
/// will be one after a non blank line.
/// </remarks>
public double BoxHeightExtra
(
ref int LineStart,
out int LineEnd,
double RequestHeight,
double LineExtraSpace,
double ParagraphExtraSpace
)
{
// skip blank lines
for (; LineStart < LineArray.Count; LineStart++)
{
TextBoxLine Line = LineArray[LineStart];
if (!Line.EndOfParagraph || Line.SegArray.Length > 1 || Line.SegArray[0].SegWidth != 0)
{
break;
}
}
// end of textbox
if (LineStart >= LineArray.Count)
{
LineStart = LineEnd = LineArray.Count;
return(0.0);
}
// calculate height for requested line count
double Total = 0.0;
double Height = 0.0;
int End = LineEnd = LineStart;
for (;;)
{
TextBoxLine Line = LineArray[End];
if (Total + Line.LineHeight > RequestHeight)
{
break;
}
Total += Line.LineHeight;
End++;
if (!Line.EndOfParagraph || Line.SegArray.Length > 1 || Line.SegArray[0].SegWidth != 0)
{
LineEnd = End;
Height = Total;
}
if (End == LineCount)
{
break;
}
Total += LineExtraSpace;
if (Line.EndOfParagraph)
{
Total += ParagraphExtraSpace;
}
}
return(Height);
}
/// <summary>
/// Terminate TextBox
/// </summary>
public void Terminate()
{
// terminate last line
if(SegArray.Count != 0) AddLine(true);
// remove trailing empty paragraphs
for(Int32 Index = LineArray.Count - 1; Index >= 0; Index--)
{
TextBoxLine Line = LineArray[Index];
if(!Line.EndOfParagraph || Line.SegArray.Length > 1 || Line.SegArray[0].SegWidth != 0) break;
BoxHeight -= Line.Ascent + Line.Descent;
ParagraphCount--;
LineArray.RemoveAt(Index);
}
// exit
return;
}
/// <summary>
/// Thwe height of the first LineCount lines including extra line and paragraph space.
/// </summary>
/// <param name="LineCount">The requested number of lines.</param>
/// <param name="LineExtraSpace">Extra line space.</param>
/// <param name="ParagraphExtraSpace">Extra paragraph space.</param>
/// <returns>Height</returns>
public double BoxHeightExtra
(
int LineCount,
double LineExtraSpace,
double ParagraphExtraSpace
)
{
// textbox is empty
if (LineArray.Count == 0)
{
return(0.0);
}
// line count is greater than available lines
if (LineCount >= LineArray.Count)
{
return(BoxHeightExtra(LineExtraSpace, ParagraphExtraSpace));
}
// calculate height for requested line count
double Height = 0;
for (int Index = 0; ; Index++)
{
TextBoxLine Line = LineArray[Index];
Height += Line.LineHeight;
if (Index + 1 == LineCount)
{
break;
}
Height += LineExtraSpace;
if (Line.EndOfParagraph)
{
Height += ParagraphExtraSpace;
}
}
return(Height);
}
////////////////////////////////////////////////////////////////////
// Stretch text to given width
////////////////////////////////////////////////////////////////////
private Boolean TextFitToWidth(
Double ReqWidth,
out Double WordSpacing,
out Double CharSpacing,
TextBoxLine Line
)
{
WordSpacing = 0;
CharSpacing = 0;
Int32 CharCount = 0;
Double Width = 0;
Int32 SpaceCount = 0;
Double SpaceWidth = 0;
foreach(TextBoxSeg Seg in Line.SegArray)
{
// accumulate line width
CharCount += Seg.Text.Length;
Width += Seg.SegWidth;
// count spaces
SpaceCount += Seg.SpaceCount;
// accumulate space width
SpaceWidth += Seg.SpaceCount * Seg.Font.CharWidth(Seg.FontSize, ' ');
}
// reduce character count by one
CharCount--;
if(CharCount <= 0) return(false);
// extra spacing required
Double ExtraSpace = ReqWidth - Width;
// highest possible output device resolution (12000 dots per inch)
Double MaxRes = 0.006 / ScaleFactor;
// string is too wide
if(ExtraSpace < (-MaxRes)) return(false);
// string is just right
if(ExtraSpace < MaxRes) return(true);
// String does not have any blank characters
if(SpaceCount == 0)
{
CharSpacing = ExtraSpace / CharCount;
return(true);
}
// extra space per word
WordSpacing = ExtraSpace / SpaceCount;
// extra space is equal or less than one blank
if(WordSpacing <= SpaceWidth / SpaceCount) return(true);
// extra space is larger that one blank
// increase character and word spacing
CharSpacing = ExtraSpace / (10 * SpaceCount + CharCount);
WordSpacing = 10 * CharSpacing;
return(true);
}
////////////////////////////////////////////////////////////////////
// Draw text justify to width within text box
////////////////////////////////////////////////////////////////////
private Double DrawText(
Double PosX,
Double PosY,
Double Width,
TextBoxLine Line,
PdfPage Page
)
{
Double WordSpacing;
Double CharSpacing;
if(!TextFitToWidth(Width, out WordSpacing, out CharSpacing, Line)) return(DrawText(PosX, PosY, Line, Page));
SaveGraphicsState();
SetWordSpacing(WordSpacing);
SetCharacterSpacing(CharSpacing);
Double SegPosX = PosX;
foreach(TextBoxSeg Seg in Line.SegArray)
{
Double SegWidth = DrawText(Seg.Font, Seg.FontSize, SegPosX, PosY, TextJustify.Left, Seg.DrawStyle, Seg.FontColor, Seg.Text) + Seg.SpaceCount * WordSpacing + Seg.Text.Length * CharSpacing;
if(Seg.WebLink != null)
{
if(Page == null) throw new ApplicationException("TextBox with WebLink. You must call DrawText with PdfPage");
Page.AddWebLink(SegPosX, PosY - Seg.Font.DescentPlusLeading(Seg.FontSize), SegPosX + SegWidth, PosY + Seg.Font.AscentPlusLeading(Seg.FontSize), Seg.WebLink);
}
SegPosX += SegWidth;
}
RestoreGraphicsState();
return(SegPosX - PosX);
}
////////////////////////////////////////////////////////////////////
// Draw text within text box center or right justified
////////////////////////////////////////////////////////////////////
private Double DrawText(
Double PosX,
Double PosY,
Double Width,
TextBoxJustify Justify,
TextBoxLine Line,
PdfPage Page
)
{
Double LineWidth = 0;
foreach(TextBoxSeg Seg in Line.SegArray) LineWidth += Seg.SegWidth;
Double SegPosX = PosX;
if(Justify == TextBoxJustify.Right) SegPosX += Width - LineWidth;
else SegPosX += 0.5 * (Width - LineWidth);
foreach(TextBoxSeg Seg in Line.SegArray)
{
Double SegWidth = DrawText(Seg.Font, Seg.FontSize, SegPosX, PosY, TextJustify.Left, Seg.DrawStyle, Seg.FontColor, Seg.Text);
if(Seg.WebLink != null)
{
if(Page == null) throw new ApplicationException("TextBox with WebLink. You must call DrawText with PdfPage");
Page.AddWebLink(SegPosX, PosY - Seg.Font.DescentPlusLeading(Seg.FontSize), SegPosX + SegWidth, PosY + Seg.Font.AscentPlusLeading(Seg.FontSize), Seg.WebLink);
}
SegPosX += SegWidth;
}
return(SegPosX - PosX);
}
