public void EnsureCurrentTextRun(int index)
{
Run run = CurrentTextRun;
if (run != null && run.HasParent)
{
SetCurrentCharIndex(index);
}
else
{
if (_needUpdateCurrentRun)
{
SetCurrentCharIndex2(index);
_needUpdateCurrentRun = false;
}
else
{
SetCurrentCharIndexToBegin();
if (index != -1)
{
int limit = CurrentLine.CharCount();
if (index > limit)
{
index = limit;
}
SetCurrentCharIndex(index);
}
}
}
}
public char DoDeleteOneChar()
{
if (CharIndex < CurrentLine.CharCount())
{
//simulate backspace keystroke
SetCurrentCharStepRight();
return(BackSpaceOneChar());
}
else
{
return('\0');
}
}