utils.cpp

来自「ncbi源码」· C++ 代码 · 共 113 行

/*
 * ===========================================================================
 * PRODUCTION $Log: utils.cpp,v $
 * PRODUCTION Revision 1000.0  2004/06/01 21:29:31  gouriano
 * PRODUCTION PRODUCTION: IMPORTED [GCC34_MSVC7] Dev-tree R1.2
 * PRODUCTION
 * ===========================================================================
 */

/*  $Id: utils.cpp,v 1000.0 2004/06/01 21:29:31 gouriano Exp $
 * ===========================================================================
 *
 *                            PUBLIC DOMAIN NOTICE
 *               National Center for Biotechnology Information
 *
 *  This software/database is a "United States Government Work" under the
 *  terms of the United States Copyright Act.  It was written as part of
 *  the author's official duties as a United States Government employee and
 *  thus cannot be copyrighted.  This software/database is freely available
 *  to the public for use. The National Library of Medicine and the U.S.
 *  Government have not placed any restriction on its use or reproduction.
 *
 *  Although all reasonable efforts have been taken to ensure the accuracy
 *  and reliability of the software and data, the NLM and the U.S.
 *  Government do not and cannot warrant the performance or results that
 *  may be obtained by using this software or data. The NLM and the U.S.
 *  Government disclaim all warranties, express or implied, including
 *  warranties of performance, merchantability or fitness for any particular
 *  purpose.
 *
 *  Please cite the author in any work or product based on this material.
 *
 * ===========================================================================
 *
 * Authors:  Andrey Yazhuk
 *
 * File Description:
 */
 
#include <ncbi_pch.hpp>
#include <gui/widgets/fl/utils.hpp>


BEGIN_NCBI_SCOPE

/// truncates given string so that its lenght is less or equal "w"
/// "trunc" controls truncation, if "trunc" == eTruncate_Ellipsis
/// "..." is appended to the end of the truncated string.
string fl_trunc_text(const char* s, int n, int w, EFL_Truncate trunc )
{
    _ASSERT(s);
    static const char* sc_ellipsis = "...";

    int full_w = (int) fl_width(s, n);
    
    if(full_w <= w) { //truncation is not needed
        return s;
    } else {
        int w_av = 0; // width available
        int len = n;
        switch(trunc)   {
        case eTruncate_Empty: w_av = w; break;
        case eTruncate_Ellipsis:    w_av = w - (int) fl_width(sc_ellipsis); break;
        }

        if(w_av > 0)    { // adjust string length
            double K = ((double) w_av) / full_w; // 
            len = (int) (K * n);
            int new_w = (int) fl_width(s, len);

            if(new_w > w_av)    {
                for( ; new_w > w_av  &&  --len > 0; )   {
                    new_w = (int) fl_width(s, len);
                }
            } else {
                for( ; new_w < w_av  &&  ++len < n;  )  {
                    new_w = (int) fl_width(s, len);
                }
                if(new_w > w_av)
                    len--;
            }
        } else len = 0;
        
        
        // create result string
        _ASSERT(len >= 0);
        
        string res(s, len);
        if(trunc == eTruncate_Ellipsis) {
            res += sc_ellipsis;
        }
        return res;
    }
}

END_NCBI_SCOPE

/*
 * ===========================================================================
 * $Log: utils.cpp,v $
 * Revision 1000.0  2004/06/01 21:29:31  gouriano
 * PRODUCTION: IMPORTED [GCC34_MSVC7] Dev-tree R1.2
 *
 * Revision 1.2  2004/05/21 22:27:53  gorelenk
 * Added PCH ncbi_pch.hpp
 *
 * Revision 1.1  2004/05/13 17:19:20  yazhuk
 * Initial revision
 *
 * ===========================================================================
 */