internal Geometry GetTightBoundingGeometryFromTextPositions(ITextPointer startPosition, ITextPointer endPosition, double paragraphTopSpace, Rect visibleRect)
{
Geometry geometry = null;
Geometry floatAndFigGeometry = null;
int cpStartTextPointer = startPosition.Offset;
int cpParagraphStart = Paragraph.ParagraphStartCharacterPosition;
int dcpStart = Math.Max(cpStartTextPointer, cpParagraphStart) - cpParagraphStart;
int cpEndTextPointer = endPosition.Offset;
int cpParagraphEnd = Paragraph.ParagraphEndCharacterPosition;
int dcpEnd = Math.Min(cpEndTextPointer, cpParagraphEnd) - cpParagraphStart;
// apply first line top space only if selection starts before or exactly at this paragraph
double firstLineTopSpace = (cpStartTextPointer < cpParagraphStart) ? paragraphTopSpace : 0.0;
// handle end-of-para only if the range extends beyond this paragraph
bool handleEndOfPara = cpEndTextPointer > cpParagraphEnd;
// mirror transform - needed if flow direction changes
Transform transform = null;
if (ThisFlowDirection != PageFlowDirection)
{
transform = new MatrixTransform(-1.0, 0.0, 0.0, 1.0, TextDpi.FromTextDpi(2 * _pageContext.PageRect.u + _pageContext.PageRect.du), 0.0);
// (and while we are at it) visibleRect should be mirrored too
visibleRect = transform.TransformBounds(visibleRect);
}
// query paragraph details
PTS.FSTEXTDETAILS textDetails;
PTS.Validate(PTS.FsQueryTextDetails(PtsContext.Context, _paraHandle.Value, out textDetails));
// 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 ParaCache
if (textDetails.fsktd == PTS.FSKTEXTDETAILS.fsktdFull)
{
if (textDetails.u.full.cLines > 0)
{
if (!PTS.ToBoolean(textDetails.u.full.fLinesComposite))
{
// (a) full with simple lines
geometry = PathGeometryFromDcpRangeSimpleLines(dcpStart, dcpEnd, firstLineTopSpace, handleEndOfPara, ref textDetails.u.full, visibleRect);
}
else
{
// (b) full with composite lines - when figures/floaters are present
geometry = PathGeometryFromDcpRangeCompositeLines(dcpStart, dcpEnd, firstLineTopSpace, handleEndOfPara, ref textDetails.u.full, visibleRect);
}
}
// build highlight for floaters and figures in this paragraph
if (textDetails.u.full.cAttachedObjects > 0)
{
floatAndFigGeometry = PathGeometryFromDcpRangeFloatersAndFigures(cpStartTextPointer, cpEndTextPointer, ref textDetails.u.full);
}
}
else
{
// (c) cached - when using ParaCache
Debug.Assert(textDetails.fsktd == PTS.FSKTEXTDETAILS.fsktdCached);
Debug.Assert(false, "Should not get here. ParaCache is not currently used.");
}
// at this point geometry contains only the text content related geometry
if (geometry != null && transform != null)
{
// mirror back to page flow direction
CaretElement.AddTransformToGeometry(geometry, transform);
}
// rectangles from which floatAndFigGeometry is calculated are already mirrored.
// this is why geometry and floatAndFigGeometry are combined after geometry is mirrored above
if (floatAndFigGeometry != null)
{
CaretElement.AddGeometry(ref geometry, floatAndFigGeometry);
}
return (geometry);
}
/// <summary>
/// Transforms point to content's coordinate system.
/// </summary>
/// <param name="rect">Rect to which transform is applied.</param>
private void TransformToContent(ref Rect rect)
{
// DocumentPage.Visual for printing scenarions needs to be always returned
// in LeftToRight FlowDirection. Hence, if the document is RightToLeft,
// mirroring transform need to be applied to the content of DocumentPage.Visual.
FlowDirection flowDirection = (FlowDirection)_owner.StructuralCache.PropertyOwner.GetValue(FlowDocument.FlowDirectionProperty);
if (flowDirection == FlowDirection.RightToLeft)
{
MatrixTransform transform = new MatrixTransform(-1.0, 0.0, 0.0, 1.0, _owner.Size.Width, 0.0);
rect = transform.TransformBounds(rect);
}
}
