Method SPositionFromLineX

scintilla/src/Editor.cxx:615–651

* Find the document position corresponding to an x coordinate on a particular document line. * Ensure is between whole characters when document is in multi-byte or UTF-8 mode. */

 * Ensure is between whole characters when document is in multi-byte or UTF-8 mode.
 */
SelectionPosition Editor::SPositionFromLineX ( int lineDoc, int x )
{
    RefreshStyleData();
    if ( lineDoc >= pdoc->LinesTotal() ) {
        return SelectionPosition ( pdoc->Length() );
    }
    //Platform::DebugPrintf("Position of (%d,%d) line = %d top=%d\n", pt.x, pt.y, line, topLine);
    AutoSurface surface ( this );
    AutoLineLayout ll ( llc, RetrieveLineLayout ( lineDoc ) );
    int retVal = 0;
    if ( surface && ll ) {
        unsigned int posLineStart = pdoc->LineStart ( lineDoc );
        LayoutLine ( lineDoc, surface, vs, ll, wrapWidth );
        int subLine = 0;
        int lineStart = ll->LineStart ( subLine );
        int lineEnd = ll->LineLastVisible ( subLine );
        XYPOSITION subLineStart = ll->positions[lineStart];
        XYPOSITION newX = x;
        if ( ll->wrapIndent != 0 ) {
            if ( lineStart != 0 ) {	// Wrapped
                newX -= ll->wrapIndent;
            }
        }
        int i = ll->FindBefore ( newX + subLineStart, lineStart, lineEnd );
        while ( i < lineEnd ) {
            if ( ( newX + subLineStart ) < ( ( ll->positions[i] + ll->positions[i + 1] ) / 2 ) ) {
                retVal = pdoc->MovePositionOutsideChar ( i + posLineStart, 1 );
                return SelectionPosition ( retVal );
            }
            i++;
        }
        const XYPOSITION spaceWidth = vs.styles[ll->EndLineStyle()].spaceWidth;
        int spaceOffset = ( newX + subLineStart - ll->positions[lineEnd] + spaceWidth / 2 ) / spaceWidth;
        return SelectionPosition ( lineEnd + posLineStart, spaceOffset );
    }
    return SelectionPosition ( retVal );
}

int Editor::PositionFromLineX ( int lineDoc, int x )
{