112 lines
2.6 KiB
C
112 lines
2.6 KiB
C
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/****************************************************************************
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** Copyright (C) 2001-2011 Klaralvdalens Datakonsult AB. All rights reserved.
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**
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** This file is part of the KD Chart library.
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**
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** Licensees holding valid commercial KD Chart licenses may use this file in
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** accordance with the KD Chart Commercial License Agreement provided with
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** the Software.
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**
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**
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** This file may be distributed and/or modified under the terms of the
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** GNU General Public License version 2 and version 3 as published by the
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** Free Software Foundation and appearing in the file LICENSE.GPL.txt included.
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**
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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**
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** Contact info@kdab.com if any conditions of this licensing are not
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** clear to you.
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**
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**********************************************************************/
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#ifndef KDCHARTPAINTERSAVER_P_H
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#define KDCHARTPAINTERSAVER_P_H
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//
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// W A R N I N G
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// -------------
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//
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// This file is not part of the KD Chart API. It exists purely as an
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// implementation detail. This header file may change from version to
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// version without notice, or even be removed.
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//
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// We mean it.
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//
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#include <qpainter.h>
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#include <KDABLibFakes>
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namespace KDChart {
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/**
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\internal
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@short Resource Allocation Is Initialization for QPainter::save and
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restore
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Usage:
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Instead of
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\code
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painter.save();
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// ...
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painter.restore();
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\endcode
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Use this:
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\code
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const QPainterSaver saver( &painter );
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// ...
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\endcode
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which makes sure that restore() is called when exiting from guard
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clauses, or when exceptions are thrown.
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*/
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class PainterSaver {
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Q_DISABLE_COPY( PainterSaver )
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public:
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explicit PainterSaver( QPainter* p )
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: painter( p )
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{
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#if defined Q_OS_WIN
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static bool initialized = false;
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static bool isQt4_3_0;
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if( !initialized )
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{
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isQt4_3_0 = ( QString::fromLatin1( qVersion() ) == QString::fromLatin1( "4.3.0" ) );
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}
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initialized = true;
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m_isQt4_3_0 = isQt4_3_0;
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#endif
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p->save();
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}
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~PainterSaver()
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{
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#if defined Q_OS_WIN
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// the use of setClipRect is a workaround for a bug in Qt 4.3.0 which could
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// lead to an assert on Windows
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if( m_isQt4_3_0 )
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{
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painter->setClipRect( 0, 0, 2, 2 );
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}
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#endif
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painter->restore();
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}
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private:
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#if defined Q_OS_WIN
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bool m_isQt4_3_0;
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#endif
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QPainter* const painter;
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};
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}
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#endif /* KDCHARTPAINTERSAVER_P_H */
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