private int findCharacterPositionInPart(DocumentRow row, StylizedRowElement atom, float offset)
{
int farLength = atom.range.Length;
int nearLength = 0;
CharacterRange range = new CharacterRange(0, farLength);
string test = row.Raw.Substring(range.First, range.Length);
float nearSize = 0;
float farSize = MeasureStringPart(range, test, atom.style).Size.Width;
if (nearSize > offset) return nearLength;
if (farSize < offset) return farLength - 1;
while (farLength > nearLength)
{
if (farSize < offset)
{
break;
}
if (nearSize > offset)
{
farLength = nearLength;
break;
}
range = new CharacterRange(0, nearLength + (farLength - nearLength) / 2);
test = row.Raw.Substring(range.First, range.Length);
float middle = MeasureStringPart(range, test, atom.style).Size.Width;
if (middle < offset)
{
if (nearLength == range.Length)
{
return farSize - middle > middle - nearSize ? nearLength : farLength;
}
nearLength = range.Length;
nearSize = middle;
}
else
{
if (farLength == range.Length)
{
return farSize - middle > middle - nearSize ? nearLength : farLength;
}
farLength = range.Length;
farSize = middle;
}
}
return farLength;
}
public Point GetNearestCaretPosition(Point viewScreenPoint)
{
if (Document == null)
{
return(Point.Empty);
}
PointF pt = viewScreenPoint;
pt.X += renderStuff.LeftOffset;
DocumentRowView candidate = null;
for (int o = renderStuff.FirstRow; o <= renderStuff.LastRow && candidate == null; ++o)
{
DocumentRowView rowView = renderList[o];
if (rowView.bounds.Size.Height > pt.Y)
{
candidate = rowView;
}
pt.Y -= rowView.bounds.Size.Height;
}
if (candidate == null)
{
candidate = renderList[renderStuff.LastRow];
}
StylizedRowElement atom = null;
float partOffset = pt.X;
for (int i = 0; i < candidate.partSizes.Length; ++i)
{
if (partOffset < candidate.partSizes[i].Width)
{
atom = candidate.parts[i];
break;
}
partOffset -= candidate.partSizes[i].Width;
}
if (atom == null)
{
atom = candidate.parts[candidate.parts.Length - 1];
}
Point res = new Point();
res.Y = candidate.row.Index;
res.X = findCharacterPositionInPart(candidate.row, atom, pt.X);
return(res);
}
private float findCharacterPositionOffset(DocumentRowView rowView, int letterOffset)
{
float result = 0;
for (int i = 0; i < rowView.parts.Length && letterOffset > 0; ++i)
{
StylizedRowElement atom = rowView.parts[i];
if (atom.range.Length <= letterOffset)
{
result += rowView.partSizes[i].Width;
}
else
{
CharacterRange range = new CharacterRange(0, letterOffset);
string test = rowView.row.Raw.Substring(range.First, range.Length);
result += MeasureStringPart(range, test, atom.style).Size.Width;
}
letterOffset -= atom.range.Length;
}
return(result);
}
private StylizedRowElement[] combine(DocumentRow row, ICollection<FaceApplied> styles)
{
if (styles == null || styles.Count == 0)
{
var result = new StylizedRowElement[1];
result[0] = new StylizedRowElement(new CharacterRange(0, row.Length), style);
return result;
}
var elements = new List<CharacterRange>
{
new CharacterRange(0, row.Length)
};
foreach (var styleApplied in styles)
{
var faceRange = styleApplied.Range;
for (var i = 0; i < elements.Count; ++i)
{
CharacterRange element = elements[i];
//if we are before range needed
if (element == faceRange)
{
continue;
}
if (element.First + element.Length < faceRange.First)
{
continue;
}
// if we are after range needed
if (element.First >= faceRange.First + faceRange.Length)
{
break;
}
// if face range after element start
if (element.First < faceRange.First)
{
var preFace = new CharacterRange(element.First, faceRange.First - element.First);
element.Length -= preFace.Length;
element.First += preFace.Length;
elements[i] = element;
elements.Insert(i++, preFace);
}
if (element.First + element.Length <= faceRange.First + faceRange.Length)
{
continue;
}
var afterOffset = faceRange.First + faceRange.Length;
var afterOffsetLength = element.First + element.Length - afterOffset;
element.Length -= afterOffsetLength;
elements[i] = element;
elements.Insert(++i, new CharacterRange(afterOffset, afterOffsetLength));
}
}
var els = new List<StylizedRowElement>();
foreach (var range in elements)
{
var rangeStyle = Style;
foreach (var face in styles)
{
if (!intersect(face.Range, range))
continue;
rangeStyle = rangeStyle.Combine(FindFace(face.Face).FaceStyle);
}
els.Add(new StylizedRowElement(range, rangeStyle));
}
return els.ToArray();
}
private StylizedRowElement[] combine(DocumentRow row, ICollection <FaceApplied> styles)
{
if (styles == null || styles.Count == 0)
{
var result = new StylizedRowElement[1];
result[0] = new StylizedRowElement(new CharacterRange(0, row.Length), style);
return(result);
}
var elements = new List <CharacterRange>
{
new CharacterRange(0, row.Length)
};
foreach (var styleApplied in styles)
{
var faceRange = styleApplied.Range;
for (var i = 0; i < elements.Count; ++i)
{
CharacterRange element = elements[i];
//if we are before range needed
if (element == faceRange)
{
continue;
}
if (element.First + element.Length < faceRange.First)
{
continue;
}
// if we are after range needed
if (element.First >= faceRange.First + faceRange.Length)
{
break;
}
// if face range after element start
if (element.First < faceRange.First)
{
var preFace = new CharacterRange(element.First, faceRange.First - element.First);
element.Length -= preFace.Length;
element.First += preFace.Length;
elements[i] = element;
elements.Insert(i++, preFace);
}
if (element.First + element.Length <= faceRange.First + faceRange.Length)
{
continue;
}
var afterOffset = faceRange.First + faceRange.Length;
var afterOffsetLength = element.First + element.Length - afterOffset;
element.Length -= afterOffsetLength;
elements[i] = element;
elements.Insert(++i, new CharacterRange(afterOffset, afterOffsetLength));
}
}
var els = new List <StylizedRowElement>();
foreach (var range in elements)
{
var rangeStyle = Style;
foreach (var face in styles)
{
if (!intersect(face.Range, range))
{
continue;
}
rangeStyle = rangeStyle.Combine(FindFace(face.Face).FaceStyle);
}
els.Add(new StylizedRowElement(range, rangeStyle));
}
return(els.ToArray());
}
private SizeF measure(Graphics g, DocumentRow row, StylizedRowElement atom)
{
return MeasureStringPart(new CharacterRange(0, atom.range.Length),
g, row.Raw, atom.style).Size;
}
private SizeF measure(Graphics g, DocumentRow row, StylizedRowElement atom)
{
return(MeasureStringPart(new CharacterRange(0, atom.range.Length),
g, row.Raw, atom.style).Size);
}
private int findCharacterPositionInPart(DocumentRow row, StylizedRowElement atom, float offset)
{
int farLength = atom.range.Length;
int nearLength = 0;
CharacterRange range = new CharacterRange(0, farLength);
string test = row.Raw.Substring(range.First, range.Length);
float nearSize = 0;
float farSize = MeasureStringPart(range, test, atom.style).Size.Width;
if (nearSize > offset)
{
return(nearLength);
}
if (farSize < offset)
{
return(farLength - 1);
}
while (farLength > nearLength)
{
if (farSize < offset)
{
break;
}
if (nearSize > offset)
{
farLength = nearLength;
break;
}
range = new CharacterRange(0, nearLength + (farLength - nearLength) / 2);
test = row.Raw.Substring(range.First, range.Length);
float middle = MeasureStringPart(range, test, atom.style).Size.Width;
if (middle < offset)
{
if (nearLength == range.Length)
{
return(farSize - middle > middle - nearSize ? nearLength : farLength);
}
nearLength = range.Length;
nearSize = middle;
}
else
{
if (farLength == range.Length)
{
return(farSize - middle > middle - nearSize ? nearLength : farLength);
}
farLength = range.Length;
farSize = middle;
}
}
return(farLength);
}