/// <summary>
/// Add non-zero geometry bounds to the bounds list
/// </summary>
private void AddValidTextBounds(
ArrayList boundsList,
TextBounds bounds
)
{
if (bounds.Rectangle.Width != 0 && bounds.Rectangle.Height != 0)
{
boundsList.Add(bounds);
}
}
/// <summary>
/// Client to get an array of bounding rectangles of a range of characters within a text line.
/// </summary>
/// <param name="firstTextSourceCharacterIndex">index of first character of specified range</param>
/// <param name="textLength">number of characters of the specified range</param>
/// <returns>an array of bounding rectangles.</returns>
public override IList<TextBounds> GetTextBounds(
int firstTextSourceCharacterIndex,
int textLength
)
{
if ((_statusFlags & StatusFlags.IsDisposed) != 0)
{
throw new ObjectDisposedException(SR.Get(SRID.TextLineHasBeenDisposed));
}
if(textLength == 0)
{
throw new ArgumentOutOfRangeException("textLength", SR.Get(SRID.ParameterMustBeGreaterThanZero));
}
if(textLength < 0)
{
firstTextSourceCharacterIndex += textLength;
textLength = -textLength;
}
if(firstTextSourceCharacterIndex < _cpFirst)
{
textLength += (firstTextSourceCharacterIndex - _cpFirst);
firstTextSourceCharacterIndex = _cpFirst;
}
if(firstTextSourceCharacterIndex > _cpFirst + _metrics._cchLength - textLength)
{
textLength = (_cpFirst + _metrics._cchLength - firstTextSourceCharacterIndex);
}
if (_ploline.Value == IntPtr.Zero)
{
return CreateDegenerateBounds();
}
Point position = new Point(0,0);
// get first cp sublines & text cell
int firstDepth;
LsTextCell firstTextCell;
LsQSubInfo[] firstSublines = new LsQSubInfo[_depthQueryMax];
int lscpFirst = GetInternalCp(firstTextSourceCharacterIndex);
QueryLineCpPpoint(
lscpFirst,
firstSublines,
out firstDepth,
out firstTextCell
);
if(firstDepth <= 0)
{
// this happens for empty line (line containing only EOP)
return CreateDegenerateBounds();
}
// get last cp sublines & text cell
int lastDepth;
LsTextCell lastTextCell;
LsQSubInfo[] lastSublines = new LsQSubInfo[_depthQueryMax];
int lscpEnd = GetInternalCp(firstTextSourceCharacterIndex + textLength - 1);
QueryLineCpPpoint(
lscpEnd,
lastSublines,
out lastDepth,
out lastTextCell
);
if(lastDepth <= 0)
{
// This should never happen but if it does, we still cant throw here.
// We must return something even though it's a degenerate bounds or
// client hittesting code will just crash.
Debug.Assert(false);
return CreateDegenerateBounds();
}
// check if collapsing symbol is wholely selected
bool collapsingSymbolSelected =
( _collapsingSymbol != null
&& _collapsedRange != null
&& firstTextSourceCharacterIndex < _collapsedRange.TextSourceCharacterIndex
&& firstTextSourceCharacterIndex + textLength - _collapsedRange.TextSourceCharacterIndex > _collapsedRange.Length / 2
);
TextBounds[] bounds = null;
ArrayList boundsList = null;
// By default, if the hittested CP is visible, then we want cpFirst to hit
// on the leading edge of the first visible cp, and cpEnd to hit on the trailing edge of the
// last visible cp.
bool isCpFirstTrailing = false;
bool isCpEndTrailing = true;
if (lscpFirst > firstTextCell.lscpEndCell)
{
// when cpFirst is after the last visible cp, then it hits the trailing edge of that cp
isCpFirstTrailing = true;
}
if (lscpEnd < lastTextCell.lscpStartCell)
{
// when cpEnd is before the first visible cp, then it hits the leading edge of that cp
isCpEndTrailing = false;
}
if (firstDepth == lastDepth && firstSublines[firstDepth - 1].lscpFirstSubLine == lastSublines[lastDepth - 1].lscpFirstSubLine)
{
// first and last cp are within the same subline
int count = collapsingSymbolSelected ? 2 : 1;
bounds = new TextBounds[count];
bounds[0] =
new TextBounds(
LSRun.RectUV(
position,
new LSPOINT(
LSLineUToParagraphU(
GetDistanceInsideTextCell(
lscpFirst,
isCpFirstTrailing,
firstSublines,
firstDepth,
ref firstTextCell
) + firstTextCell.pointUvStartCell.x
),
0
),
new LSPOINT(
LSLineUToParagraphU(
GetDistanceInsideTextCell(
lscpEnd,
isCpEndTrailing,
lastSublines,
lastDepth,
ref lastTextCell
) + lastTextCell.pointUvStartCell.x
),
_metrics._height
),
this
),
Convert.LsTFlowToFlowDirection(firstSublines[firstDepth - 1].lstflowSubLine),
CalculateTextRunBounds(lscpFirst, lscpEnd + 1)
);
if (count > 1)
{
bounds[1] = CreateCollapsingSymbolBounds();
}
}
else
{
// first and last cp are not in the same subline.
boundsList = new ArrayList(2);
int lscpCurrent = lscpFirst;
// The hittested cp can be outside of the returned sublines when it is a hidden cp.
// We should not pass beyond the end of the returned sublines.
int lscpEndInSubline = Math.Min(
lscpEnd,
lastSublines[lastDepth - 1].lscpFirstSubLine + lastSublines[lastDepth - 1].lsdcpSubLine - 1
);
int currentDistance = GetDistanceInsideTextCell(
lscpFirst,
isCpFirstTrailing,
firstSublines,
firstDepth,
ref firstTextCell
) + firstTextCell.pointUvStartCell.x;
int baseLevelDepth;
CollectTextBoundsToBaseLevel(
boundsList,
ref lscpCurrent,
ref currentDistance,
firstSublines,
firstDepth,
lscpEndInSubline,
out baseLevelDepth
);
if (baseLevelDepth < lastDepth)
{
CollectTextBoundsFromBaseLevel(
boundsList,
ref lscpCurrent,
ref currentDistance,
lastSublines,
lastDepth,
baseLevelDepth
);
}
// Collect the bounds from the start of the immediate enclosing subline of the last LSCP
// to the hittested text cell.
AddValidTextBounds(
boundsList,
new TextBounds(
LSRun.RectUV(
position,
new LSPOINT(
LSLineUToParagraphU(currentDistance),
0
),
new LSPOINT(
LSLineUToParagraphU(
GetDistanceInsideTextCell(
lscpEnd,
isCpEndTrailing,
lastSublines,
lastDepth,
ref lastTextCell
) + lastTextCell.pointUvStartCell.x
),
_metrics._height
),
this
),
Convert.LsTFlowToFlowDirection(lastSublines[lastDepth - 1].lstflowSubLine),
CalculateTextRunBounds(lscpCurrent, lscpEnd + 1)
)
);
}
if (bounds == null)
{
Debug.Assert(boundsList != null);
if (boundsList.Count > 0)
{
if (collapsingSymbolSelected)
{
// add one more for collapsed symbol
AddValidTextBounds(boundsList, CreateCollapsingSymbolBounds());
}
bounds = new TextBounds[boundsList.Count];
for (int i = 0; i < boundsList.Count; i++)
{
bounds[i] = (TextBounds)boundsList[i];
}
}
else
{
// No non-zerowidth bounds detected, fallback to the position of first cp
// This can happen if hidden run is hittest'd.
int u = LSLineUToParagraphU(
GetDistanceInsideTextCell(
lscpFirst,
isCpFirstTrailing,
firstSublines,
firstDepth,
ref firstTextCell
) + firstTextCell.pointUvStartCell.x
);
bounds = new TextBounds[]
{
new TextBounds(
LSRun.RectUV(
position,
new LSPOINT(u, 0),
new LSPOINT(u, _metrics._height),
this
),
Convert.LsTFlowToFlowDirection(firstSublines[firstDepth - 1].lstflowSubLine),
null
)
};
}
}
return bounds;
}