/// <summary>
/// Add characters to the line(s), and returns the last width of the characters that were laid out.
/// </summary>
protected virtual PDFUnit AddCharacters(string chars)
{
this.AssertCurrentLine();
PDFUnit lineheight = this.TextRenderOptions.GetLineHeight();
int offset = 0;
ZeroLineCounter zeros = new ZeroLineCounter();
PDFSize measured = PDFSize.Empty;
PDFSize required = PDFSize.Empty;
while (offset < chars.Length)
{
//Check that we have enough space for the next line
PDFLayoutLine line = this.CurrentLine;
PDFLayoutRegion reg = line.Region;
PDFUnit availH = reg.AvailableHeight;
PDFUnit availW = line.AvailableWidth;
if (availH < lineheight)
{
if (this.Position.OverflowAction != OverflowAction.Clip)
{
this.DoMoveToNextRegion(lineheight);
if (!this.ContinueLayout)
{
return(PDFUnit.Zero);
}
else
{
line = this.CurrentLine;
reg = line.Region;
availW = line.AvailableWidth;
availH = reg.AvailableHeight;
}
}
else
{
availH = lineheight;
}
}
//Measure the string an get the fitted characters
Context.PerformanceMonitor.Begin(PerformanceMonitorType.Text_Measure);
int fitted;
measured = this.MeasureString(availH, availW, chars, offset, out fitted);
Context.PerformanceMonitor.End(PerformanceMonitorType.Text_Measure);
required = new PDFSize(measured.Width, lineheight);
if (fitted <= 0) //nothing fitted on the line
{
this.AddSoftReturn(0);
if (!zeros.AssertIncrement(this.Context))
{
return(PDFUnit.Zero);
}
}
else if (fitted + offset == chars.Length) // everything fitted on the line
{
zeros.Reset();
string all = chars.Substring(offset);
//if (offset == 0)
this.AddCharactersToCurrentLine(required, all);
//else
// this.AddCharactersToCurrentLine(required, chars, offset, fitted);
offset += fitted;
}
else if (IsBrokenInWord(chars, offset, fitted) && CanSplitOnWordsOnly() && !IsEmptyLine()) //don't break on words unless we have to.
{
this.AddSoftReturn(0);
if (!zeros.AssertIncrement(this.Context))
{
return(PDFUnit.Zero);
}
}
else //partial fit
{
zeros.Reset();
string partial = chars.Substring(offset, fitted);
this.AddCharactersToCurrentLine(required, partial);
//this.AddCharactersToCurrentLine(required, chars, offset, fitted);
this.AddSoftReturn(measured.Width);
offset += fitted;
//Consume any white space as we are now on a new line.
//We should never get here for NoWrap as it will alywys fit all characters one one line.
while (offset < chars.Length && char.IsWhiteSpace(chars, offset))
{
offset++;
}
}
}
return(required.Width);
}
/// <summary>
/// Add characters to the line(s), and returns the last width of the characters that were laid out.
/// </summary>
protected virtual PDFUnit AddProxyCharacters(PDFTextProxyOp proxy)
{
this.AssertCurrentLine();
PDFUnit lineheight = this.TextRenderOptions.GetLineHeight();
ZeroLineCounter zeros = new ZeroLineCounter();
PDFSize measured = PDFSize.Empty;
PDFSize required = PDFSize.Empty;
PDFLayoutLine line = this.CurrentLine;
PDFLayoutRegion reg = line.Region;
PDFUnit availH = reg.AvailableHeight;
PDFUnit availW = line.AvailableWidth;
if (availH < lineheight)
{
if (this.Position.OverflowAction != OverflowAction.Clip)
{
availH = lineheight;
}
else
{
this.DoMoveToNextRegion(lineheight);
if (!this.ContinueLayout)
{
return(PDFUnit.Zero);
}
}
}
//Measure the string an get the fitted characters
int fitted;
this.Context.PerformanceMonitor.Begin(PerformanceMonitorType.Text_Measure);
measured = this.MeasureString(availH, availW, proxy.Text, 0, out fitted);
this.Context.PerformanceMonitor.End(PerformanceMonitorType.Text_Measure);
required = new PDFSize(measured.Width, lineheight);
if (fitted < proxy.Text.Length) //cannot split a proxy - must simply be a single run.
{
//try on the next line to see if we can put everything on there.
this.AddSoftReturn(0);
if (!zeros.AssertIncrement(this.Context))
{
return(PDFUnit.Zero);
}
availW = this.CurrentLine.AvailableWidth;
this.Context.PerformanceMonitor.Begin(PerformanceMonitorType.Text_Measure);
measured = this.MeasureString(availH, availW, proxy.Text, 0, out fitted);
this.Context.PerformanceMonitor.End(PerformanceMonitorType.Text_Measure);
if (fitted < proxy.Text.Length) //Still cannot fit the proxy so not much we can do. Log it and return
{
this.Context.TraceLog.Add(TraceLevel.Warning, LOG_CATEGORY, "The text proxy for '" + proxy.Text + "' could not fit the characters on a single line. Overflow of proxies is not currently supported.");
return(measured.Width);
}
required = new PDFSize(measured.Width, lineheight);
}
// everything fitted on the line
zeros.Reset();
this.AddProxyToCurrentLine(required, proxy);
return(required.Width);
}