private ITextPointer BackspaceCaretUnitPositionFromDcpCompositeLines(
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);
// Declare backspace position and set it to initial position
ITextPointer backspaceCaretPosition = position;
// 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)))
{
if (dcp == element.dcpFirst)
{
// Beginning of element.
if (dcp == 0)
{
// Assert that this is first elment on first line
Debug.Assert(index == 0);
Debug.Assert(elIndex == 0);
return position;
}
else
{
if (elIndex > 0)
{
// Beginning of element, but not of line
--elIndex;
element = arrayLineElement[elIndex];
}
else
{
// There must be at least one line above this
Debug.Assert(index > 0);
// Go to previous line
--index;
lineDesc = arrayLineDesc[index];
if (lineDesc.cElements == 0)
{
// Stay in same position
return position;
}
else
{
// Get list of line elements.
PtsHelper.LineElementListFromCompositeLine(PtsContext, ref lineDesc, out arrayLineElement);
element = arrayLineElement[arrayLineElement.Length - 1];
}
}
}
}
// 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 [....]");
// Create CharacterHit from dcp, and get backspace
CharacterHit charHit = new CharacterHit(dcp, 0);
CharacterHit backspaceCharacterHit = line.GetBackspaceCaretCharacterHit(charHit);
LogicalDirection logicalDirection;
if (backspaceCharacterHit.FirstCharacterIndex + backspaceCharacterHit.TrailingLength == element.dcpFirst)
{
// Going forward brought us to the start of a line, context must be backward for previous line
if (index == 0)
{
// First line, so we will stay forward
logicalDirection = LogicalDirection.Forward;
}
else
{
logicalDirection = LogicalDirection.Backward;
}
}
else
{
logicalDirection = (backspaceCharacterHit.TrailingLength > 0) ? LogicalDirection.Backward : LogicalDirection.Forward;
}
backspaceCaretPosition = GetTextPosition(backspaceCharacterHit.FirstCharacterIndex + backspaceCharacterHit.TrailingLength, logicalDirection);
// Dispose the line
line.Dispose();
return backspaceCaretPosition;
}
}
}
return backspaceCaretPosition;
}
private ITextPointer BackspaceCaretUnitPositionFromDcpSimpleLines(
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);
// Declare backspace position and set it to initial position
ITextPointer backspaceCaretPosition = position;
// 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)))
{
if (dcp == lineDesc.dcpFirst)
{
// Go to previous line
if (index == 0)
{
return position;
}
else
{
// Update dcp, lineDesc
Debug.Assert(index > 0);
--index;
lineDesc = arrayLineDesc[index];
}
}
// 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 [....]");
// Create CharacterHit and get backspace index from line API
CharacterHit textSourceCharacterIndex = new CharacterHit(dcp, 0);
CharacterHit backspaceCharacterHit = line.GetBackspaceCaretCharacterHit(textSourceCharacterIndex);
LogicalDirection logicalDirection;
if (backspaceCharacterHit.FirstCharacterIndex + backspaceCharacterHit.TrailingLength == lineDesc.dcpFirst)
{
// Going forward brought us to the start of a line, context must be backward for previous line
if (index == 0)
{
// First line, so we will stay forward
logicalDirection = LogicalDirection.Forward;
}
else
{
logicalDirection = LogicalDirection.Backward;
}
}
else
{
logicalDirection = (backspaceCharacterHit.TrailingLength > 0) ? LogicalDirection.Backward : LogicalDirection.Forward;
}
backspaceCaretPosition = GetTextPosition(backspaceCharacterHit.FirstCharacterIndex + backspaceCharacterHit.TrailingLength, logicalDirection);
// Dispose the line
line.Dispose();
break;
}
}
Debug.Assert(backspaceCaretPosition != null);
return backspaceCaretPosition;
}