internal ITextPointer GetTextPositionFromDistance(int dcpLine, double distance)
{
// Query paragraph details
int urDistance = TextDpi.ToTextDpi(distance);
PTS.FSTEXTDETAILS textDetails;
PTS.Validate(PTS.FsQueryTextDetails(PtsContext.Context, _paraHandle.Value, out textDetails));
if(ThisFlowDirection != PageFlowDirection)
{
urDistance = _pageContext.PageRect.du - urDistance;
}
int lineWidth = 0;
bool firstLine = (dcpLine == 0);
int dcpLim = 0;
IntPtr breakRecLine = IntPtr.Zero;
// There are 3 different types of text paragraphs:
// (a) full with simple lines
// (b) full with composite lines - when figures/floaters are present
// (c) cached - when using ParaChache
if (textDetails.fsktd == PTS.FSKTEXTDETAILS.fsktdFull)
{
if (textDetails.u.full.cLines > 0)
{
if (!PTS.ToBoolean(textDetails.u.full.fLinesComposite))
{
// (a) full with simple lines
PTS.FSLINEDESCRIPTIONSINGLE [] arrayLineDesc;
PtsHelper.LineListSimpleFromTextPara(PtsContext, _paraHandle.Value, ref textDetails.u.full, out arrayLineDesc);
// Get lines information
int index;
for (index = 0; index < arrayLineDesc.Length; index++)
{
PTS.FSLINEDESCRIPTIONSINGLE lineDesc = arrayLineDesc[index];
if (dcpLine == lineDesc.dcpFirst)
{
lineWidth = lineDesc.dur;
urDistance -= lineDesc.urStart;
// Store dcpLim to check if line lengths are in [....]
dcpLim = lineDesc.dcpLim;
breakRecLine = lineDesc.pfsbreakreclineclient;
break;
}
}
}
else
{
// (b) full with composite lines - when figures/floaters are present
PTS.FSLINEDESCRIPTIONCOMPOSITE [] arrayLineDesc;
PtsHelper.LineListCompositeFromTextPara(PtsContext, _paraHandle.Value, ref textDetails.u.full, out arrayLineDesc);
// Get lines information
int index;
for (index = 0; index < arrayLineDesc.Length; index++)
{
PTS.FSLINEDESCRIPTIONCOMPOSITE lineDesc = arrayLineDesc[index];
if (lineDesc.cElements == 0) continue;
// Get list of line elements.
PTS.FSLINEELEMENT [] arrayLineElement;
PtsHelper.LineElementListFromCompositeLine(PtsContext, ref lineDesc, out arrayLineElement);
int elIndex;
for (elIndex = 0; elIndex < arrayLineElement.Length; elIndex++)
{
PTS.FSLINEELEMENT element = arrayLineElement[elIndex];
if (element.dcpFirst == dcpLine)
{
lineWidth = element.dur;
urDistance -= element.urStart;
// Store dcpLim to check if line lengths are in [....]
dcpLim = element.dcpLim;
breakRecLine = element.pfsbreakreclineclient;
break;
}
}
if (elIndex < arrayLineElement.Length)
{
firstLine = (index == 0);
break;
}
}
}
}
}
else
{
// (c) cached - when using ParaChache
Debug.Assert(textDetails.fsktd == PTS.FSKTEXTDETAILS.fsktdCached);
Debug.Assert(false, "Should not get here. ParaCache is not currently used.");
}
// Recreate text line
Line.FormattingContext ctx = new Line.FormattingContext(false, true, true, TextParagraph.TextRunCache);
Line line = new Line(Paragraph.StructuralCache.TextFormatterHost, this, Paragraph.ParagraphStartCharacterPosition);
if(IsOptimalParagraph)
{
ctx.LineFormatLengthTarget = dcpLim - dcpLine;
}
TextParagraph.FormatLineCore(line, breakRecLine, ctx, dcpLine, lineWidth, firstLine, dcpLine);
// Assert that number of characters in Text line is the same as our expected length
Invariant.Assert(line.SafeLength == dcpLim - dcpLine, "Line length is out of [....]");
CharacterHit charHit = line.GetTextPositionFromDistance(urDistance);
int cpPosition = charHit.FirstCharacterIndex + charHit.TrailingLength;
int dcpLastAttachedObject = TextParagraph.GetLastDcpAttachedObjectBeforeLine(dcpLine);
if(cpPosition < dcpLastAttachedObject)
{
cpPosition = dcpLastAttachedObject;
}
StaticTextPointer pos = TextContainerHelper.GetStaticTextPointerFromCP(Paragraph.StructuralCache.TextContainer, cpPosition + Paragraph.ParagraphStartCharacterPosition);
LogicalDirection logicalDirection = (charHit.TrailingLength > 0) ? LogicalDirection.Backward : LogicalDirection.Forward;
line.Dispose();
return pos.CreateDynamicTextPointer(logicalDirection);
}