/// <summary>
/// Retruns true if the current line has no entries or non-character runs
/// </summary>
/// <returns></returns>
private bool IsEmptyLine()
{
if (this.CurrentLine.IsEmpty)
{
return(true);
}
else
{
for (int i = 0; i < this.CurrentLine.Runs.Count; i++)
{
PDFLayoutRun run = this.CurrentLine.Runs[i];
if (run is PDFTextRunBegin)
{
continue;
}
else if (run is PDFTextRunSpacer)
{
continue;
}
else if (run is PDFLayoutPositionedRegionRun)
{
continue;
}
else if (run is PDFLayoutInlineBegin)
{
continue;
}
else
{
return(false);
}
}
return(true);
}
}
/// <summary>
/// Overrides default behaviour to calculate the maximum height.
/// </summary>
/// <param name="msg"></param>
/// <returns></returns>
protected override bool DoClose(ref string msg)
{
PDFLayoutRun last = this.LastRun();
if (null != last && last.IsClosed == false)
{
last.Close();
}
//Return the base value
return(base.DoClose(ref msg));
}
/// <summary>
/// Justs adds a run
/// </summary>
/// <param name="run"></param>
public virtual void AddRun(PDFLayoutRun run)
{
if (run is PDFTextRunBegin)
{
PDFUnit ascent = ((PDFTextRunBegin)run).TextRenderOptions.GetAscent();
if (ascent > this.BaseLineOffset)
{
this.BaseLineOffset = ascent;
}
}
else if (run is PDFTextRunEnd)
{
PDFTextRunEnd end = (PDFTextRunEnd)run;
PDFUnit ascent = end.Start.TextRenderOptions.GetAscent();
if (ascent > this.BaseLineOffset)
{
this.BaseLineOffset = ascent;
}
}
this.Runs.Add(run);
}
internal bool JustifyContent(PDFUnit total, PDFUnit current, PDFUnit available, bool all, List <PDFTextRunCharacter> runCache, ref PDFTextRenderOptions currOptions)
{
if (this.Runs.Count < 1)
{
return(false);
}
bool shouldJustify = all;
PDFLayoutRun last = this.Runs[this.Runs.Count - 1];
if (last is PDFTextRunNewLine && (last as PDFTextRunNewLine).IsHardReturn == false)
{
shouldJustify = true;
}
if (shouldJustify)
{
runCache.Clear();
bool intext = (null != currOptions); //if we have text render options then even if we are the first run we can be considered as inside a text block
int charCount = 0;
int spaceCount = 0;
PDFTextRunCharacter lastchars = null;
for (int i = 0; i < this.Runs.Count; i++)
{
PDFLayoutRun cur = this.Runs[i];
if (cur is PDFTextRunBegin)
{
currOptions = ((PDFTextRunBegin)cur).TextRenderOptions;
if (!intext)
{
intext = true;
}
}
else if (cur is PDFTextRunCharacter && intext)
{
PDFTextRunCharacter chars = cur as PDFTextRunCharacter;
if (!(currOptions.WordSpacing.HasValue || currOptions.CharacterSpacing.HasValue))
{
AddCharactersAndSpaces(chars.Characters, ref charCount, ref spaceCount);
lastchars = chars;
}
}
else if (cur is PDFLayoutComponentRun)
{
lastchars = null;
}
}
// Post process to calculate the required spacing
// if we have some text in our line.
if (intext && (spaceCount + charCount > 0))
{
if (null != lastchars && lastchars.Characters.EndsWith(" "))
{
lastchars.Characters = lastchars.Characters.Substring(0, lastchars.Characters.Length - 1);
spaceCount -= 1;
}
double spaceToCharFactor = 10; // apply ten times more to spaces than characters.
double full = (spaceCount * spaceToCharFactor) + charCount;
this._linespacingOptions = new ExtraSpacingOptions()
{
CharSpace = available / full, WordSpace = (available / full) * spaceToCharFactor, Options = currOptions
};
charCount = 0;
spaceCount = 0;
PDFUnit currWidth = 0;
PDFUnit change = PDFUnit.Zero;
for (int i = 0; i < this.Runs.Count; i++)
{
PDFLayoutRun cur = this.Runs[i];
if (cur is PDFTextRunBegin)
{
PDFTextRunBegin begin = (PDFTextRunBegin)cur;
currOptions = begin.TextRenderOptions;
if (i > 0)
{
change = (_linespacingOptions.WordSpace * spaceCount) + (_linespacingOptions.CharSpace * charCount);
begin.LineInset += change;
}
}
else if (cur is PDFTextRunCharacter)
{
if (!currOptions.WordSpacing.HasValue || !currOptions.CharacterSpacing.HasValue)
{
PDFTextRunCharacter chars = cur as PDFTextRunCharacter;
int runChars = 0;
int runSpaces = 0;
AddCharactersAndSpaces(chars.Characters, ref runChars, ref runSpaces);
charCount += runChars;
spaceCount += runSpaces;
chars.ExtraSpace = (_linespacingOptions.WordSpace * runSpaces) + (_linespacingOptions.CharSpace * runChars);
}
}
else if (cur is PDFLayoutComponentRun)
{
if (i > 0)
{
PDFLayoutComponentRun comprun = (cur as PDFLayoutComponentRun);
PDFRect bounds = comprun.TotalBounds;
bounds.X += (_linespacingOptions.WordSpace * spaceCount) + (_linespacingOptions.CharSpace * charCount);
comprun.TotalBounds = bounds;
}
}
else if (cur is PDFTextRunNewLine)
{
PDFTextRunNewLine newLine = (cur as PDFTextRunNewLine);
newLine.Offset = new PDFSize(newLine.Offset.Width + change, newLine.Offset.Height);
}
}
}
}
return(shouldJustify);
}
