private string CreateIndentForNextLine(ISpanned dest, int dend, int istart)
{
if (istart > -1)
{
int iend;
for (iend = ++istart;
iend < dend;
++iend)
{
char c = dest.CharAt(iend);
if (c != ' ' &&
c != '\t')
{
break;
}
}
var subsequence = dest.SubSequence(istart, iend);
return(subsequence + AddBulletPointIfNeeded(dest.CharAt(iend)));
}
else
{
return("");
}
}
private int FindLineBreakPosition(ISpanned dest, int dstart)
{
int istart = dstart - 1;
for (; istart > -1; --istart)
{
char c = dest.CharAt(istart);
if (c == '\n')
{
break;
}
}
return(istart);
}
public override ICharSequence FilterFormatted(ICharSequence source, int start, int end, ISpanned dest, int dstart,
int dend)
{
// Borrowed heavily from the Android source
ICharSequence filterFormatted = base.FilterFormatted(source, start, end, dest, dstart, dend);
if (filterFormatted != null)
{
source = filterFormatted;
start = 0;
end = filterFormatted.Length();
}
int sign = -1;
int dec = -1;
int dlen = dest.Length();
// Find out if the existing text has a sign or decimal point characters.
for (var i = 0; i < dstart; i++)
{
char c = dest.CharAt(i);
if (IsSignChar(c))
{
sign = i;
}
else if (IsDecimalPointChar(c))
{
dec = i;
}
}
for (int i = dend; i < dlen; i++)
{
char c = dest.CharAt(i);
if (IsSignChar(c))
{
return(new String("")); // Nothing can be inserted in front of a sign character.
}
if (IsDecimalPointChar(c))
{
dec = i;
}
}
// If it does, we must strip them out from the source.
// In addition, a sign character must be the very first character,
// and nothing can be inserted before an existing sign character.
// Go in reverse order so the offsets are stable.
SpannableStringBuilder stripped = null;
for (int i = end - 1; i >= start; i--)
{
char c = source.CharAt(i);
var strip = false;
if (IsSignChar(c))
{
if (i != start || dstart != 0)
{
strip = true;
}
else if (sign >= 0)
{
strip = true;
}
else
{
sign = i;
}
}
else if (IsDecimalPointChar(c))
{
if (dec >= 0)
{
strip = true;
}
else
{
dec = i;
}
}
if (strip)
{
if (end == start + 1)
{
return(new String("")); // Only one character, and it was stripped.
}
if (stripped == null)
{
stripped = new SpannableStringBuilder(source, start, end);
}
stripped.Delete(i - start, i + 1 - start);
}
}
return(stripped ?? filterFormatted);
}