public static MathListIndex IndexForPoint <TFont, TGlyph>(this TextLineDisplay <TFont, TGlyph> self, TypesettingContext <TFont, TGlyph> context, PointF point) where TFont : IFont <TGlyph>
{
// Convert the point to the reference of the CTLine
var relativePoint = new PointF(point.X - self.Position.X, point.Y - self.Position.Y);
var runsAndIndicies =
self.Runs
.Select(run => ValueTuple.Create(run, run.Run.GlyphIndexForXOffset(context, relativePoint.Plus(run.Position).X)))
.Where(x => x.Item2.HasValue)
.ToArray();
if (runsAndIndicies.Length == 0)
{
return(null);
}
var(r, nindex) = runsAndIndicies.Single();
var index = nindex.GetValueOrDefault();
var diffLng = r.Run.Length != r.Range.Length;
if (index < 0 || (!diffLng && index > self.Range.Length) || (diffLng && index > r.Run.Length))
{
throw new InvalidCodePathException($"Returned index out of range: {index}, range ({self.Range.Location}, {self.Range.Length})");
}
if (!diffLng)
{
return(MathListIndex.Level0Index(self.Range.Location + index));
}
if (index > r.Run.Length / 2)
{
return(MathListIndex.Level0Index(self.Range.End));
}
return(MathListIndex.Level0Index(self.Range.Location));
}
public static int MathListIndexToStringIndex <TFont, TGlyph>(this TextLineDisplay <TFont, TGlyph> self, int mlIndex) where TFont : IFont <TGlyph>
{
if (mlIndex >= self.Atoms.Length)
{
throw ArgOutOfRange($"The index is not in the range {self.Atoms.Length}", mlIndex, nameof(mlIndex));
}
int strIndex = 0;
for (int i = 0; i < mlIndex; i++)
{
strIndex += self.Atoms[i].Nucleus.Length;
}
return(strIndex);
}
// Convert the index into the current string to an index into the mathlist. These may not be the same since a single
// math atom may have multiple characters.
public static int StringIndexToMathListIndex <TFont, TGlyph>(this TextLineDisplay <TFont, TGlyph> self, int strIndex) where TFont : IFont <TGlyph>
{
int strLenCovered = 0;
for (int mlIndex = 0; mlIndex < self.Atoms.Length; mlIndex++)
{
if (strLenCovered >= strIndex)
{
return(mlIndex);
}
strLenCovered += self.Atoms[mlIndex].Nucleus.Length;
}
if (strLenCovered < strIndex)
{
throw new InvalidCodePathException("StrIndex should not be more than the len covered");
}
return(self.Atoms.Length);
}
public static MathListIndex IndexForPoint <TFont, TGlyph>(this TextLineDisplay <TFont, TGlyph> self, TypesettingContext <TFont, TGlyph> context, PointF point) where TFont : IFont <TGlyph>
{
// Convert the point to the reference of the CTLine
var relativePoint = new PointF(point.X - self.Position.X, point.Y - self.Position.Y);
var indices = self.Runs.Select(run => run.Run.GlyphIndexForXOffset(context, relativePoint.Plus(run.Position).X)).Where(x => x.HasValue);
if (indices.IsEmpty())
{
return(null);
}
var index = indices.Single().GetValueOrDefault();
// The index returned is in UTF-16, translate to codepoint index.
// NSUInteger codePointIndex = stringIndexToCodePointIndex(self.attributedString.string, index);
// Convert the code point index to an index into the mathlist
var mlIndex = self.StringIndexToMathListIndex(index);
// index will be between 0 and _range.length inclusive
if (mlIndex < 0 || mlIndex > self.Range.Length)
{
throw new InvalidCodePathException($"Returned index out of range: {index}, range ({self.Range.Location}, {self.Range.Length})");
}
// translate to the current index
return(MathListIndex.Level0Index(self.Range.Location + mlIndex));
}
public static (TextRunDisplay <TFont, TGlyph> run, int charIndex) GetRunAndCharIndexFromStringIndex <TFont, TGlyph>(this TextLineDisplay <TFont, TGlyph> self, int lineCharIndex) where TFont : IFont <TGlyph>
[System.Diagnostics.DebuggerStepThrough] // Debugger should stop at the line that uses this function void AssertText(string expected, TextLineDisplay <TFont, TGlyph> actual) => Assert.Equal(expected, string.Concat(actual.Text));
public static string StringText(this TextLineDisplay <FrontEnd.TestMathFont, char> display) => new string(display.Text.ToArray());
public static string StringText(this TextLineDisplay <MathFont <char>, char> display) => new string(display.Text.ToArray());
this TextLineDisplay <TFont, TGlyph> self, int lineCharIndex) where TFont : IFont <TGlyph>
