Quantum GIS API Documentation  1.7.4
src/gui/qgslonglongvalidator.h
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00001 /***************************************************************************
00002                          qgslonglongvalidator.h  -  description
00003                              -------------------
00004     begin                : August 2010
00005     copyright            : (C) 2010 by J├╝rgen E. Fischer
00006     email                : jef@norbit.de
00007 
00008   adapted version of QIntValidator for qint64
00009  ***************************************************************************/
00010 
00011 /***************************************************************************
00012  *                                                                         *
00013  *   This program is free software; you can redistribute it and/or modify  *
00014  *   it under the terms of the GNU General Public License as published by  *
00015  *   the Free Software Foundation; either version 2 of the License, or     *
00016  *   (at your option) any later version.                                   *
00017  *                                                                         *
00018  ***************************************************************************/
00019 /* $Id$ */
00020 
00021 #ifndef QGSLONGLONGVALIDATOR_H
00022 #define QGSLONGLONGVALIDATOR_H
00023 
00024 #include <limits>
00025 #include <QValidator>
00026 #include <QLocale>
00027 
00028 class GUI_EXPORT QgsLongLongValidator : public QValidator
00029 {
00030     Q_OBJECT
00031 
00032   public:
00033     explicit QgsLongLongValidator( QObject *parent )
00034         : QValidator( parent )
00035         , b( std::numeric_limits<qint64>::min() )
00036         , t( std::numeric_limits<qint64>::max() )
00037     {}
00038 
00039     QgsLongLongValidator( qint64 bottom, qint64 top, QObject *parent )
00040         : QValidator( parent )
00041         , b( bottom )
00042         , t( top )
00043     {}
00044 
00045     ~QgsLongLongValidator()
00046     {}
00047 
00048     QValidator::State validate( QString &input, int& ) const
00049     {
00050       if ( input.isEmpty() )
00051         return Intermediate;
00052 
00053       if ( b >= 0 && input.startsWith( '-' ) )
00054         return Invalid;
00055 
00056       if ( t < 0 && input.startsWith( '+' ) )
00057         return Invalid;
00058 
00059       if ( input == "-" || input == "+" )
00060         return Intermediate;
00061 
00062 
00063       bool ok;
00064       qlonglong entered = input.toLongLong( &ok );
00065       if ( !ok )
00066         return Invalid;
00067 
00068       if ( entered >= b && entered <= t )
00069         return Acceptable;
00070 
00071       if ( entered >= 0 )
00072       {
00073         // the -entered < b condition is necessary to allow people to type
00074         // the minus last (e.g. for right-to-left languages)
00075         return ( entered > t && -entered < b ) ? Invalid : Intermediate;
00076       }
00077       else
00078       {
00079         return ( entered < b ) ? Invalid : Intermediate;
00080       }
00081     }
00082 
00083     void setBottom( qint64 bottom ) { b = bottom; }
00084     void setTop( qint64 top ) { t = top; }
00085 
00086     virtual void setRange( qint64 bottom, qint64 top )
00087     {
00088       b = bottom;
00089       t = top;
00090     }
00091 
00092     qint64 bottom() const { return b; }
00093     qint64 top() const { return t; }
00094 
00095   private:
00096     Q_DISABLE_COPY( QgsLongLongValidator )
00097 
00098     qint64 b;
00099     qint64 t;
00100 };
00101 
00102 #endif // QGSLONGLONGVALIDATOR_H
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