private int[] GetCollapseSelectionRange(TextPosition clickPosition, VisualTextLine activeLine, int lineLength)
{
var startColumn = clickPosition.Column;
var endColumn = clickPosition.Column;
if (endColumn + 1 <= lineLength)
{
endColumn += 1;
}
else
{
startColumn -= 1;
}
// move left from current position
for (var i = clickPosition.Column; i >= 0; i--)
{
var charInfo = activeLine.GetCharInfoAt(i);
if (!charInfo.IsCharacter && !char.IsLetterOrDigit(charInfo.Text[0]))
{
startColumn = i;
}
else
{
break;
}
}
// move right from current position
for (var i = clickPosition.Column; i < lineLength; i++)
{
var charInfo = activeLine.GetCharInfoAt(i);
if (!charInfo.IsCharacter && !char.IsLetterOrDigit(charInfo.Text[0]))
{
endColumn = i + 1;
}
else
{
break;
}
}
return(new[] { startColumn, endColumn });
}
private VisualTextLine Cut(VisualTextLine line, int startIndex, int?count = null)
{
var substringLength = count == null ? line.Length - startIndex : count.Value;
if (line is CollapsedVisualTextLine)
{
var charInfos = Enumerable.Range(startIndex, substringLength).Select(index => line.GetCharInfoAt(index));
if (charInfos.Any(info => !info.IsCharacter))
{
return(GetPartialLineBeforeCollapse(charInfos, line, startIndex, substringLength));
}
else
{
return(GetPartialLineAfterCollapse(line, startIndex, substringLength));
}
}
else
{
return(CutStandardLine(line, startIndex, substringLength));
}
}