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tdegraphics/kghostview/displayoptions.cpp

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/**
* Copyright (C) 2003, Luís Pedro Coelho
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "displayoptions.h"
#include <kdebug.h>
#include <tqregexp.h>
#include <kcmdlineargs.h>
#include <kconfig.h>
namespace {
const double allowedMagnifications[] = {
0.125,
0.25,
0.3333,
0.5,
0.6667,
0.75,
1,
1.25,
1.50,
2,
3,
4,
6,
8
};
const size_t numberOfMagnifications = ( sizeof( allowedMagnifications ) / sizeof( allowedMagnifications[ 0 ] ) );
}
DisplayOptions DisplayOptions::parse( KCmdLineArgs* args )
{
DisplayOptions res;
#define CHECK_ORIENTATION( tag, value ) \
if ( args->isSet( tag ) ) res._overrideOrientation = value; \
if ( args->getOption( "orientation" ) == tag ) res._overrideOrientation = value;
CHECK_ORIENTATION( "landscape", CDSC_LANDSCAPE );
CHECK_ORIENTATION( "seascape", CDSC_SEASCAPE );
CHECK_ORIENTATION( "portrait", CDSC_PORTRAIT);
CHECK_ORIENTATION( "upsidedown", CDSC_UPSIDEDOWN);
res.setMagnification( args->getOption( "scale" ).toFloat() );
res.setPage( args->getOption( "page" ).toInt() - 1 ); // transform from 1-based into 0-based
//res._overridePageMedia = args->getOption( "paper" );
kdDebug(4500 ) << "Parsed options: " << DisplayOptions::toString( res ) << endl;
return res;
}
namespace {
const char* const rformat = ".page: (\\d+); .magnification: ([\\d\\.]+); .orientation = (\\d+); .media = ([^;]*);";
const char* const qformat = ".page: %1; .magnification: %2; .orientation = %3; .media = %4;";
}
TQString DisplayOptions::toString( const DisplayOptions& options )
{
return TQString( qformat )
.arg( options.page() )
.arg( options.magnification() )
.arg( options.overrideOrientation() )
.arg( options.overridePageMedia().utf8() );
}
bool DisplayOptions::fromString( DisplayOptions& out, const TQString& in )
{
TQRegExp regex( TQString::fromLatin1( rformat ) );
if ( regex.search( in ) < 0 ) return false;
out.reset();
out.setPage( regex.cap( 1 ).toInt() );
out.setMagnification( regex.cap( 2 ).toDouble() );
out.setOverrideOrientation( static_cast<CDSC_ORIENTATION_ENUM>( regex.cap( 3 ).toInt() ) );
if ( !regex.cap( 4 ).isEmpty() ) out.setOverridePageMedia( regex.cap( 4 ) );
return true;
}
bool DisplayOptions::canZoomIn() const
{
return unsigned( closestIndex() ) < ( numberOfMagnifications - 1 );
}
bool DisplayOptions::zoomIn()
{
if ( !canZoomIn() ) return false;
_magnification = allowedMagnifications[ closestIndex() + 1 ];
return true;
}
bool DisplayOptions::canZoomOut() const
{
return closestIndex() > 0;
}
bool DisplayOptions::zoomOut()
{
if ( !canZoomOut() ) return false;
_magnification = allowedMagnifications[ closestIndex() - 1 ];
return true;
}
double DisplayOptions::magnification() const
{
return _magnification;
}
void DisplayOptions::setMagnification( double newZoom ) {
_magnification = newZoom;
}
unsigned DisplayOptions::closestIndex() const {
kdDebug(4500) << "DisplayOptions::closestIndex(" << _magnification << ")" << endl;
unsigned res = 0;
while ( res < numberOfMagnifications
&& allowedMagnifications[ res ] < _magnification ) ++res;
if ( res >= ( numberOfMagnifications - 1 ) ) return numberOfMagnifications - 1;
if ( res == 0 ) return 0;
if ( ( allowedMagnifications[ res ] - _magnification ) > ( _magnification - allowedMagnifications[ res - 1 ] ) ) {
--res;
}
kdDebug(4500) << "DisplayOptions::closestIndex(" << res << "): nearest allowed magnification: "
<< allowedMagnifications[ res ] << endl;
return res;
}
TQValueList<double> DisplayOptions::normalMagnificationValues() {
TQValueList<double> res;
for ( const double *first = allowedMagnifications, *last = allowedMagnifications + numberOfMagnifications;
first != last;
++first ) {
res << *first;
}
return res;
}