posterpreview.cpp

00001 /*
00002  *  This file is part of the KDE libraries
00003  *  Copyright (c) 2001-2002 Michael Goffioul <kdeprint@swing.be>
00004  *
00005  *  This library is free software; you can redistribute it and/or
00006  *  modify it under the terms of the GNU Library General Public
00007  *  License version 2 as published by the Free Software Foundation.
00008  *
00009  *  This library is distributed in the hope that it will be useful,
00010  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012  *  Library General Public License for more details.
00013  *
00014  *  You should have received a copy of the GNU Library General Public License
00015  *  along with this library; see the file COPYING.LIB.  If not, write to
00016  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00017  *  Boston, MA 02110-1301, USA.
00018  **/
00019 
00020 #include "posterpreview.h"
00021 
00022 #include <kprocess.h>
00023 #include <qpainter.h>
00024 #include <qsimplerichtext.h>
00025 #include <qtimer.h>
00026 #include <qpixmap.h>
00027 #include <kprinter.h>
00028 #include <klocale.h>
00029 #include <kcursor.h>
00030 #include <kglobalsettings.h>
00031 
00032 PosterPreview::PosterPreview( QWidget *parent, const char *name )
00033     : QFrame( parent, name )
00034 {
00035     m_postersize = m_mediasize = "A4";
00036     m_cutmargin = 5;
00037     init();
00038 }
00039 
00040 PosterPreview::PosterPreview( const QString& postersize, const QString& mediasize, QWidget *parent, const char *name )
00041     : QFrame( parent, name )
00042 {
00043     m_postersize = postersize;
00044     m_mediasize = mediasize;
00045     m_cutmargin = 5;
00046     init();
00047 }
00048 
00049 PosterPreview::~PosterPreview()
00050 {
00051     delete m_process;
00052 }
00053 
00054 void PosterPreview::init()
00055 {
00056     m_process = new KProcess;
00057     connect( m_process, SIGNAL( receivedStderr( KProcess*, char*, int ) ), SLOT( slotProcessStderr( KProcess*, char*, int ) ) );
00058     connect( m_process, SIGNAL( processExited( KProcess* ) ), SLOT( slotProcessExited( KProcess* ) ) );
00059 
00060     m_cols = m_rows = m_pw = m_ph = m_mw = m_mh = 0;
00061     m_dirty = false;
00062     setDirty();
00063     setMouseTracking( true );
00064     setBackgroundMode( Qt::NoBackground );
00065 }
00066 
00067 void PosterPreview::parseBuffer()
00068 {
00069     int rotate;
00070     float pw, ph, mw, mh;
00071     float x1, x2, y1, y2;
00072     sscanf( m_buffer.ascii(), "%d %d %d %g %g %g %g %g %g %g %g", &m_rows, &m_cols, &rotate,
00073             &pw, &ph, &mw, &mh, &x1, &y1, &x2, &y2 );
00074     m_pw = ( int )( rotate ? ph : pw );
00075     m_ph = ( int )( rotate ? pw : ph );
00076     m_mw = ( int )( rotate ? mh : mw );
00077     m_mh = ( int )( rotate ? mw : mh );
00078     m_posterbb.setCoords( ( int )x1, ( int )y1, ( int )x2, ( int )y2 );
00079 }
00080 
00081 void PosterPreview::setDirty()
00082 {
00083     if ( !m_dirty )
00084     {
00085         m_dirty = true;
00086         QTimer::singleShot( 1, this, SLOT( updatePoster() ) );
00087     }
00088 }
00089 
00090 void PosterPreview::updatePoster()
00091 {
00092     m_buffer = "";
00093     m_process->clearArguments();
00094     *m_process << "poster" << "-F" << "-m" + m_mediasize << "-p" + m_postersize
00095         << "-c" + QString::number( m_cutmargin ) + "%";
00096     if ( !m_process->start( KProcess::NotifyOnExit, KProcess::Stderr ) )
00097     {
00098         m_rows = m_cols = 0;
00099         m_dirty = false;
00100         update();
00101     }
00102 }
00103 
00104 void PosterPreview::drawContents( QPainter *painter )
00105 {
00106     QPixmap pix( width(), height() );
00107     QPainter *p = new QPainter( &pix );
00108 
00109     p->fillRect( 0, 0, width(), height(), colorGroup().background() );
00110 
00111     if ( isEnabled() )
00112     {
00113         if ( m_rows <= 0 || m_cols <= 0 || m_pw <= 0 || m_ph <= 0 )
00114         {
00115             QString txt = i18n( "Poster preview not available. Either the <b>poster</b> "
00116                           "executable is not properly installed, or you don't have "
00117                           "the required version; available at http://printing.kde.org/downloads/." );
00118             QSimpleRichText richtext( ( m_buffer.isEmpty() ? txt : m_buffer.prepend( "<pre>" ).append( "</pre>" ) ), p->font() );
00119             richtext.adjustSize();
00120             int x = ( width()-richtext.widthUsed() )/2, y = ( height()-richtext.height() )/2;
00121             x = QMAX( x, 0 );
00122             y = QMAX( y, 0 );
00123             richtext.draw( p, x, y, QRect( x, y, richtext.widthUsed(), richtext.height() ), colorGroup() );
00124             m_boundingrect = QRect();
00125         }
00126         else
00127         {
00128             int totalx = m_cols*m_pw, totaly = m_rows*m_ph;
00129             float scale = QMIN( float( width()-1 )/totalx, float( height()-1 )/totaly );
00130             p->translate( 0, height()-1 );
00131             p->scale( scale, -scale );
00132             int x = ( int )( width()/scale-totalx )/2, y = ( int )( height()/scale-totaly )/2;
00133             p->translate( x, y );
00134             m_boundingrect = p->xForm( QRect( 0, 0, totalx, totaly ) );
00135 
00136             x = y = 0;
00137             int px = m_posterbb.x(), py = m_posterbb.y(), pw = m_posterbb.width(), ph = m_posterbb.height();
00138             for ( int i=0; i<m_rows; i++, y+=m_ph, x=0 )
00139             {
00140                 for ( int j=0; j<m_cols; j++, x+=m_pw )
00141                 {
00142                     bool selected = ( m_selectedpages.find( i*m_cols+j+1 ) != m_selectedpages.end() );
00143                     p->fillRect( x+1, y+1, m_pw-2, m_ph-2, ( selected ? KGlobalSettings::highlightColor() : white ) );
00144                     p->drawRect( x, y, m_pw, m_ph );
00145                     if ( pw > 0 && ph > 0 )
00146                         p->fillRect( x+m_mw+px, y+m_mh+py, QMIN( pw, m_pw-2*m_mw-px ), QMIN( ph, m_ph-2*m_mh-py ),
00147                                 ( selected ? KGlobalSettings::highlightColor().dark( 160 ) : lightGray ) );
00148                     p->setPen( Qt::DotLine );
00149                     p->drawRect( x+m_mw, y+m_mh, m_pw-2*m_mw, m_ph-2*m_mh );
00150                     p->setPen( Qt::SolidLine );
00151 
00152                     pw -= m_pw-2*m_mw-px;
00153                     px = 0;
00154                 }
00155 
00156                 px = m_posterbb.x();
00157                 ph -= m_ph-2*m_mh-py;
00158                 py = 0;
00159                 pw = m_posterbb.width();
00160             }
00161         }
00162     }
00163 
00164     delete p;
00165     painter->drawPixmap( 0, 0, pix );
00166 }
00167 
00168 void PosterPreview::mouseMoveEvent( QMouseEvent *e )
00169 {
00170     if ( m_boundingrect.isValid() )
00171     {
00172         if ( m_boundingrect.contains( e->pos() ) )
00173             setCursor( KCursor::handCursor() );
00174         else
00175             setCursor( KCursor::arrowCursor() );
00176     }
00177 }
00178 
00179 void PosterPreview::mousePressEvent( QMouseEvent *e )
00180 {
00181     if ( e->button() == Qt::LeftButton && m_boundingrect.isValid() )
00182     {
00183         if ( m_boundingrect.contains( e->pos() ) )
00184         {
00185             int c, r;
00186             c = ( e->pos().x()-m_boundingrect.x() )/( m_boundingrect.width()/m_cols ) + 1;
00187             r = m_rows - ( e->pos().y()-m_boundingrect.y() )/( m_boundingrect.height()/m_rows );
00188             int pagenum = ( r-1 )*m_cols+c;
00189 
00190             if ( m_selectedpages.find( pagenum ) == m_selectedpages.end() ||
00191                     !( e->state() & Qt::ShiftButton ) )
00192             {
00193                 if ( !( e->state() & Qt::ShiftButton ) )
00194                     m_selectedpages.clear();
00195                 m_selectedpages.append( pagenum );
00196                 update();
00197                 emitSelectedPages();
00198             }
00199         }
00200         else if ( m_selectedpages.count() > 0 )
00201         {
00202             m_selectedpages.clear();
00203             update();
00204             emitSelectedPages();
00205         }
00206     }
00207 }
00208 
00209 void PosterPreview::slotProcessStderr( KProcess*, char *buf, int len )
00210 {
00211     m_buffer.append( QCString( buf, len ) );
00212 }
00213 
00214 void PosterPreview::slotProcessExited( KProcess* )
00215 {
00216     if ( m_process->normalExit() && m_process->exitStatus() == 0 )
00217         parseBuffer();
00218     else
00219         m_rows = m_cols = 0;
00220 
00221     m_dirty = false;
00222     update();
00223 }
00224 
00225 void PosterPreview::setPosterSize( int s )
00226 {
00227     setPosterSize( pageSizeToPageName( KPrinter::PageSize( s ) ) );
00228 }
00229 
00230 void PosterPreview::setPosterSize( const QString& s )
00231 {
00232     if ( m_postersize != s )
00233     {
00234         m_selectedpages.clear();
00235         m_postersize = s;
00236         setDirty();
00237         emitSelectedPages();
00238     }
00239 }
00240 
00241 void PosterPreview::setMediaSize( int s )
00242 {
00243     setMediaSize( pageSizeToPageName( ( KPrinter::PageSize )s ) );
00244 }
00245 
00246 void PosterPreview::setMediaSize( const QString& s )
00247 {
00248     if ( m_mediasize != s )
00249     {
00250         m_selectedpages.clear();
00251         m_mediasize = s;
00252         setDirty();
00253         emitSelectedPages();
00254     }
00255 }
00256 
00257 void PosterPreview::setCutMargin( int value )
00258 {
00259     m_cutmargin = value;
00260     setDirty();
00261 }
00262 
00263 void PosterPreview::setSelectedPages( const QString& s )
00264 {
00265     QStringList l = QStringList::split( ",", s, false );
00266     m_selectedpages.clear();
00267     for ( QStringList::ConstIterator it=l.begin(); it!=l.end(); ++it )
00268     {
00269         int p;
00270         if ( ( p = ( *it ).find( '-' ) ) == -1 )
00271             m_selectedpages.append( ( *it ).toInt() );
00272         else
00273         {
00274             int p1 = ( *it ).left( p ).toInt(), p2 = ( *it ).mid( p+1 ).toInt();
00275             for ( int i=p1; i<=p2; i++ )
00276                 m_selectedpages.append( i );
00277         }
00278     }
00279     update();
00280 }
00281 
00282 void PosterPreview::emitSelectedPages()
00283 {
00284     QString s;
00285     if ( m_selectedpages.count() > 0 )
00286     {
00287         for ( QValueList<int>::ConstIterator it=m_selectedpages.begin(); it!=m_selectedpages.end(); ++it )
00288             s.append( QString::number( *it ) + "," );
00289         s.truncate( s.length()-1 );
00290     }
00291     emit selectionChanged( s );
00292 }
00293 
00294 #include "posterpreview.moc"
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