/// <summary>
/// Calculates char-index from screen line/column index.
/// </summary>
/// <exception cref="ArgumentOutOfRangeException">Specified index was out of range.</exception>
public override int GetCharIndexFromLineColumnIndex(int lineIndex, int columnIndex)
{
if (lineIndex < 0 || LineCount < lineIndex)
{
throw new ArgumentOutOfRangeException("lineIndex", "Invalid index was given (lineIndex:" + lineIndex + ", LineCount:" + LineCount + ").");
}
if (columnIndex < 0)
{
throw new ArgumentOutOfRangeException("columnIndex", "Invalid index was given (columnIndex:" + columnIndex + ").");
}
return(LineLogic.GetCharIndexFromLineColumnIndex(
Document.InternalBuffer, PLHI, lineIndex, columnIndex
));
}
/// <summary>
/// Gets char-index of the char at the point specified by location in the virtual space.
/// </summary>
/// <returns>The index of the character at specified location.</returns>
public override int GetIndexFromVirPos(IGraphics g, Point pt)
{
int lineIndex, columnIndex;
int drawableTextLen;
// calc line index
lineIndex = (pt.Y / LineSpacing);
if (lineIndex < 0)
{
lineIndex = 0;
}
else if (PLHI.Count <= lineIndex &&
Document.LineCount != 0)
{
// the point indicates beyond the final line.
// treat as if the final line was specified
lineIndex = PLHI.Count - 1;
}
// calc column index
columnIndex = 0;
if (0 < pt.X)
{
int begin, end;
string line;
bool isWrapLine = false;
// get content of the line
LineLogic.GetLineRange(Document.InternalBuffer, PLHI, lineIndex, out begin, out end);
line = Document.GetTextInRange(begin, end);
if (end + 1 < Document.Length &&
!LineLogic.IsEolChar(Document[end]))
{
isWrapLine = true;
}
// calc maximum length of chars in line
int rightLimitX = pt.X;
int leftPartWidth = MeasureTokenEndX(g, line, 0, rightLimitX, out drawableTextLen);
columnIndex = drawableTextLen;
// if the location is nearer to the NEXT of that char,
// we should return the index of next one.
if (drawableTextLen < line.Length)
{
string nextChar = line[drawableTextLen].ToString();
int nextCharWidth = MeasureTokenEndX(g, nextChar, leftPartWidth) - leftPartWidth;
if (leftPartWidth + nextCharWidth / 2 < pt.X) // == "x of middle of next char" < "x of click in virtual text area"
{
columnIndex = drawableTextLen + 1;
}
}
// if the whole line can be drawn and is a wrapped line,
// decrease column to avoid indicating invalid position
else if (isWrapLine)
{
columnIndex--;
}
}
return(LineLogic.GetCharIndexFromLineColumnIndex(Document.InternalBuffer, PLHI, lineIndex, columnIndex));
}