private bool IsAtCaretUnitBoundaryFromDcpCompositeLines(
int dcp,
ITextPointer position,
ref PTS.FSTEXTDETAILSFULL textDetails)
{
ErrorHandler.Assert(!PTS.ToBoolean(textDetails.fDropCapPresent), ErrorHandler.NotSupportedDropCap);
// Get list of lines
PTS.FSLINEDESCRIPTIONCOMPOSITE[] arrayLineDesc;
PtsHelper.LineListCompositeFromTextPara(PtsContext, _paraHandle.Value, ref textDetails, out arrayLineDesc);
bool isAtCaretUnitBoundary = false;
// First iterate through lines
for (int 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);
for (int elIndex = 0; elIndex < arrayLineElement.Length; elIndex++)
{
PTS.FSLINEELEMENT element = arrayLineElement[elIndex];
// 'dcp' needs to be within line range. If position points to dcpLim,
// it means that the next line starts from such position, hence go to the next line.
if (((element.dcpFirst <= dcp) && (element.dcpLim > dcp))
|| ((element.dcpLim == dcp) && (elIndex == arrayLineElement.Length - 1) && (index == arrayLineDesc.Length - 1)))
{
CharacterHit charHit = new CharacterHit();
if (dcp >= element.dcpLim - 1 && elIndex == arrayLineElement.Length - 1 && index == arrayLineDesc.Length - 1)
{
// Special case: at the end of the last line there is a special character that
// does not belong to the line. Return true for this case
return true;
}
if (position.LogicalDirection == LogicalDirection.Backward)
{
// Beginning of element.
if (dcp == element.dcpFirst)
{
if (elIndex > 0)
{
// Beginning of element, but not of line. Create char hit at last dcp of previous element, trailing edge.
--elIndex;
element = arrayLineElement[elIndex];
charHit = new CharacterHit(dcp - 1, 1);
}
else
{
// Beginning of line
if (index == 0)
{
// Backward context at start position of first line is not considered a unit boundary
return false;
}
else
{
// Go to previous line
--index;
lineDesc = arrayLineDesc[index];
if (lineDesc.cElements == 0)
{
return false;
}
else
{
// Get list of line elements.
PtsHelper.LineElementListFromCompositeLine(PtsContext, ref lineDesc, out arrayLineElement);
element = arrayLineElement[arrayLineElement.Length - 1];
charHit = new CharacterHit(dcp - 1, 1);
}
}
}
}
else
{
// Get trailing edge of previous dcp
Invariant.Assert(dcp > 0);
charHit = new CharacterHit(dcp - 1, 1);
}
}
else if (position.LogicalDirection == LogicalDirection.Forward)
{
// Create character hit at leading edge
charHit = new CharacterHit(dcp, 0);
}
// Create and format line
Line line = new Line(Paragraph.StructuralCache.TextFormatterHost, this, Paragraph.ParagraphStartCharacterPosition);
Line.FormattingContext ctx = new Line.FormattingContext(false, PTS.ToBoolean(element.fClearOnLeft), PTS.ToBoolean(element.fClearOnRight), TextParagraph.TextRunCache);
if(IsOptimalParagraph)
{
ctx.LineFormatLengthTarget = element.dcpLim - element.dcpFirst;
}
TextParagraph.FormatLineCore(line, element.pfsbreakreclineclient, ctx, element.dcpFirst, element.dur, PTS.ToBoolean(lineDesc.fTreatedAsFirst), element.dcpFirst);
// Assert that number of characters in Text line is the same as our expected length
Invariant.Assert(line.SafeLength == element.dcpLim - element.dcpFirst, "Line length is out of [....]");
isAtCaretUnitBoundary = line.IsAtCaretCharacterHit(charHit);
// Dispose the line
line.Dispose();
return isAtCaretUnitBoundary;
}
}
}
return isAtCaretUnitBoundary;
}
private bool IsAtCaretUnitBoundaryFromDcpSimpleLines(
int dcp,
ITextPointer position,
ref PTS.FSTEXTDETAILSFULL textDetails)
{
ErrorHandler.Assert(!PTS.ToBoolean(textDetails.fDropCapPresent), ErrorHandler.NotSupportedDropCap);
// Get list of lines
PTS.FSLINEDESCRIPTIONSINGLE[] arrayLineDesc;
PtsHelper.LineListSimpleFromTextPara(PtsContext, _paraHandle.Value, ref textDetails, out arrayLineDesc);
bool isAtCaretUnitBoundary = false;
// First iterate through lines
for (int index = 0; index < arrayLineDesc.Length; index++)
{
PTS.FSLINEDESCRIPTIONSINGLE lineDesc = arrayLineDesc[index];
// 'dcp' needs to be within line range. If position points to dcpLim,
// it means that the next line starts from such position, hence go to the next line.
if (((lineDesc.dcpFirst <= dcp) && (lineDesc.dcpLim > dcp))
|| ((lineDesc.dcpLim == dcp) && (index == arrayLineDesc.Length - 1)))
{
CharacterHit charHit = new CharacterHit();
if (dcp >= lineDesc.dcpLim - 1 && index == arrayLineDesc.Length - 1)
{
// Special case: last line has additional character to mark the end of paragraph.
// We should not try and check for next source character index
// But just return true in this case
return true;
}
if (position.LogicalDirection == LogicalDirection.Backward)
{
if (lineDesc.dcpFirst == dcp)
{
if (index == 0)
{
// First position of first line does not have a trailing edge. Return false.
return false;
}
else
{
// Get the trailing edge of the last character on the previous line, at dcp - 1
index--;
lineDesc = arrayLineDesc[index];
Invariant.Assert(dcp > 0);
charHit = new CharacterHit(dcp - 1, 1);
}
}
else
{
// Get CharacterHit at trailing edge of previous position
Invariant.Assert(dcp > 0);
charHit = new CharacterHit(dcp - 1, 1);
}
}
else if (position.LogicalDirection == LogicalDirection.Forward)
{
// Get character hit at leading edge
charHit = new CharacterHit(dcp, 0);
}
// Create and format line
Line line = new Line(Paragraph.StructuralCache.TextFormatterHost, this, Paragraph.ParagraphStartCharacterPosition);
Line.FormattingContext ctx = new Line.FormattingContext(false, PTS.ToBoolean(lineDesc.fClearOnLeft), PTS.ToBoolean(lineDesc.fClearOnRight), TextParagraph.TextRunCache);
if(IsOptimalParagraph)
{
ctx.LineFormatLengthTarget = lineDesc.dcpLim - lineDesc.dcpFirst;
}
TextParagraph.FormatLineCore(line, lineDesc.pfsbreakreclineclient, ctx, lineDesc.dcpFirst, lineDesc.dur, PTS.ToBoolean(lineDesc.fTreatedAsFirst), lineDesc.dcpFirst);
// Assert that number of characters in Text line is the same as our expected length
Invariant.Assert(line.SafeLength == lineDesc.dcpLim - lineDesc.dcpFirst, "Line length is out of [....]");
isAtCaretUnitBoundary = line.IsAtCaretCharacterHit(charHit);
// Dispose the line
line.Dispose();
break;
}
}
return isAtCaretUnitBoundary;
}