File indexing completed on 2024-05-12 04:20:36

 /*
  * SPDX-FileCopyrightText: 2001-2015 Klaralvdalens Datakonsult AB. All rights reserved.
  *
  * This file is part of the KD Chart library.
  *
  * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #ifndef KCHARTPAINTERSAVER_P_H
 #define KCHARTPAINTERSAVER_P_H
 
 //
 //  W A R N I N G
 //  -------------
 //
 // This file is not part of the KD Chart API.  It exists purely as an
 // implementation detail.  This header file may change from version to
 // version without notice, or even be removed.
 //
 // We mean it.
 //
 
 #include "KChartMath_p.h"
 
 #include <QPainter>
 
 
 namespace KChart {
 
 /**
    \internal
 
    @short Resource Allocation Is Initialization for QPainter::save and
    restore
 
    Usage:
 
    Instead of
    \code
    painter.save();
    // ...
    painter.restore();
    \endcode
 
    Use this:
 
    \code
    const KChart::PainterSaver saver( &painter );
    // ...
    \endcode
 
    which makes sure that restore() is called when exiting from guard
    clauses, or when exceptions are thrown.
 */
 class PainterSaver {
     Q_DISABLE_COPY( PainterSaver )
 public:
     explicit PainterSaver( QPainter* p )
         : painter( p ) 
     {
 #if defined Q_OS_WIN
         static bool initialized = false;
         static bool isQt4_3_0;
         if ( !initialized )
         {
             isQt4_3_0 = ( QString::fromLatin1( qVersion() ) == QString::fromLatin1( "4.3.0" ) );
         }
         initialized = true;
         m_isQt4_3_0 = isQt4_3_0;
 #endif
         p->save();
     }
 
     ~PainterSaver()
     {
 #if defined Q_OS_WIN
         // the use of setClipRect is a workaround for a bug in Qt 4.3.0 which could
         // lead to an assert on Windows
         if ( m_isQt4_3_0 )
         {
             painter->setClipRect( 0, 0, 2, 2 );
         }
 #endif
         painter->restore(); 
     }
 
 private:
 #if defined Q_OS_WIN
     bool m_isQt4_3_0;
 #endif
     QPainter* const painter;
 };
 
 }
 
 #endif /* KCHARTPAINTERSAVER_P_H */