public CharacterPositionInfo GetX_AtCharacterIndex(int char_index, bool trailingEdge)
{
if (char_index > CharLength - 1)
{
throw new ArgumentOutOfRangeException
("char_index", char_index, "char_index greater than line length.");
}
CharacterPositionType pos_type = CharacterPositionType.LeadingEdge;
if (trailingEdge)
{
pos_type = CharacterPositionType.TrailingEdge;
}
return(CharacterPositionInfo.FromCharIndex(ssa_struct_ptr, char_index, pos_type));
}
public static CharacterPositionInfo FromCharIndex(IntPtr ssa_struct, int char_index, CharacterPositionType pos_type)
{
if ((pos_type == CharacterPositionType.AfterEnd) ||
(pos_type == CharacterPositionType.BeforeBeginning) ||
(pos_type == CharacterPositionType.ClusterPart))
{
throw new ArgumentException("Illegal parameter.", "pos_type");
}
var trailing = (pos_type == CharacterPositionType.TrailingEdge);
var x_offset = 0;
var res = NativeScript.ScriptStringCPtoX
(ssa_struct,
char_index,
trailing,
ref x_offset);
if (res != NativeScript.S_OK)
{
Marshal.ThrowExceptionForHR(res);
}
var ret = new CharacterPositionInfo();
ret.CharIndex = char_index;
ret.PositionType = pos_type;
ret.Xoffset = x_offset;
return(ret);
}
