public static TextRange GetRangeIncludePointer(this TextPointer p, int leftLen, int rightLen)
{
TextPointer positionAtCharOffset = p.GetPositionAtCharOffset(-1 * leftLen, LogicalDirection.Forward);
TextPointer positionAtCharOffset2 = p.GetPositionAtCharOffset(rightLen, LogicalDirection.Backward);
return(new TextRange(positionAtCharOffset, positionAtCharOffset2));
}
public static TextRange GetRange(this RichTextBox rtb, TextPointer p, int len)
{
try
{
if (p == null)
{
return(null);
}
TextPointer positionAtCharOffset;
if (len >= 0)
{
p = p.GetPositionAtOffset(0, LogicalDirection.Forward);
positionAtCharOffset = p.GetPositionAtCharOffset(len, LogicalDirection.Backward);
return(new TextRange(p, positionAtCharOffset));
}
p = p.GetPositionAtOffset(0, LogicalDirection.Backward);
positionAtCharOffset = p.GetPositionAtCharOffset(len, LogicalDirection.Forward);
return(new TextRange(positionAtCharOffset, p));
}
catch
{
}
return(null);
}