posterpreview.cpp

/*
 *  This file is part of the KDE libraries
 *  Copyright (c) 2001-2002 Michael Goffioul <tdeprint@swing.be>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License version 2 as published by the Free Software Foundation.
 *
 *  This library 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
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public License
 *  along with this library; see the file COPYING.LIB.  If not, write to
 *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301, USA.
 **/
 
#include "posterpreview.h"
 
#include <kprocess.h>
#include <tqpainter.h>
#include <tqsimplerichtext.h>
#include <tqtimer.h>
#include <tqpixmap.h>
#include <kprinter.h>
#include <tdelocale.h>
#include <kcursor.h>
#include <tdeglobalsettings.h>
 
PosterPreview::PosterPreview( TQWidget *parent, const char *name )
    : TQFrame( parent, name )
{
    m_postersize = m_mediasize = "A4";
    m_cutmargin = 5;
    init();
}
 
PosterPreview::PosterPreview( const TQString& postersize, const TQString& mediasize, TQWidget *parent, const char *name )
    : TQFrame( parent, name )
{
    m_postersize = postersize;
    m_mediasize = mediasize;
    m_cutmargin = 5;
    init();
}
 
PosterPreview::~PosterPreview()
{
    delete m_process;
}
 
void PosterPreview::init()
{
    m_process = new TDEProcess;
    connect( m_process, TQ_SIGNAL( receivedStderr( TDEProcess*, char*, int ) ), TQ_SLOT( slotProcessStderr( TDEProcess*, char*, int ) ) );
    connect( m_process, TQ_SIGNAL( processExited( TDEProcess* ) ), TQ_SLOT( slotProcessExited( TDEProcess* ) ) );
 
    m_cols = m_rows = m_pw = m_ph = m_mw = m_mh = 0;
    m_dirty = false;
    setDirty();
    setMouseTracking( true );
    setBackgroundMode( TQt::NoBackground );
}
 
void PosterPreview::parseBuffer()
{
    int rotate;
    float pw, ph, mw, mh;
    float x1, x2, y1, y2;
    sscanf( m_buffer.ascii(), "%d %d %d %g %g %g %g %g %g %g %g", &m_rows, &m_cols, &rotate,
            &pw, &ph, &mw, &mh, &x1, &y1, &x2, &y2 );
    m_pw = ( int )( rotate ? ph : pw );
    m_ph = ( int )( rotate ? pw : ph );
    m_mw = ( int )( rotate ? mh : mw );
    m_mh = ( int )( rotate ? mw : mh );
    m_posterbb.setCoords( ( int )x1, ( int )y1, ( int )x2, ( int )y2 );
}
 
void PosterPreview::setDirty()
{
    if ( !m_dirty )
    {
        m_dirty = true;
        TQTimer::singleShot( 1, this, TQ_SLOT( updatePoster() ) );
    }
}
 
void PosterPreview::updatePoster()
{
    m_buffer = "";
    m_process->clearArguments();
    *m_process << "poster" << "-F" << "-m" + m_mediasize << "-p" + m_postersize
        << "-c" + TQString::number( m_cutmargin ) + "%";
    if ( !m_process->start( TDEProcess::NotifyOnExit, TDEProcess::Stderr ) )
    {
        m_rows = m_cols = 0;
        m_dirty = false;
        update();
    }
}
 
void PosterPreview::drawContents( TQPainter *painter )
{
    TQPixmap pix( width(), height() );
    TQPainter *p = new TQPainter( &pix );
 
    p->fillRect( 0, 0, width(), height(), colorGroup().background() );
 
    if ( isEnabled() )
    {
        if ( m_rows <= 0 || m_cols <= 0 || m_pw <= 0 || m_ph <= 0 )
        {
            TQString txt = i18n( "Poster preview not available. Either the <b>poster</b> "
                          "executable is not properly installed, or you don't have the required version" );
            TQSimpleRichText richtext( ( m_buffer.isEmpty() ? txt : m_buffer.prepend( "<pre>" ).append( "</pre>" ) ), p->font() );
            richtext.adjustSize();
            int x = ( width()-richtext.widthUsed() )/2, y = ( height()-richtext.height() )/2;
            x = TQMAX( x, 0 );
            y = TQMAX( y, 0 );
            richtext.draw( p, x, y, TQRect( x, y, richtext.widthUsed(), richtext.height() ), colorGroup() );
            m_boundingrect = TQRect();
        }
        else
        {
            int totalx = m_cols*m_pw, totaly = m_rows*m_ph;
            float scale = TQMIN( float( width()-1 )/totalx, float( height()-1 )/totaly );
            p->translate( 0, height()-1 );
            p->scale( scale, -scale );
            int x = ( int )( width()/scale-totalx )/2, y = ( int )( height()/scale-totaly )/2;
            p->translate( x, y );
            m_boundingrect = p->xForm( TQRect( 0, 0, totalx, totaly ) );
 
            x = y = 0;
            int px = m_posterbb.x(), py = m_posterbb.y(), pw = m_posterbb.width(), ph = m_posterbb.height();
            for ( int i=0; i<m_rows; i++, y+=m_ph, x=0 )
            {
                for ( int j=0; j<m_cols; j++, x+=m_pw )
                {
                    bool selected = ( m_selectedpages.find( i*m_cols+j+1 ) != m_selectedpages.end() );
                    p->fillRect( x+1, y+1, m_pw-2, m_ph-2, ( selected ? TDEGlobalSettings::highlightColor() : white ) );
                    p->drawRect( x, y, m_pw, m_ph );
                    if ( pw > 0 && ph > 0 )
                        p->fillRect( x+m_mw+px, y+m_mh+py, TQMIN( pw, m_pw-2*m_mw-px ), TQMIN( ph, m_ph-2*m_mh-py ),
                                ( selected ? TQColor(TDEGlobalSettings::highlightColor().dark( 160 )) : lightGray ) );
                    p->setPen( TQt::DotLine );
                    p->drawRect( x+m_mw, y+m_mh, m_pw-2*m_mw, m_ph-2*m_mh );
                    p->setPen( TQt::SolidLine );
 
                    pw -= m_pw-2*m_mw-px;
                    px = 0;
                }
 
                px = m_posterbb.x();
                ph -= m_ph-2*m_mh-py;
                py = 0;
                pw = m_posterbb.width();
            }
        }
    }
 
    delete p;
    painter->drawPixmap( 0, 0, pix );
}
 
void PosterPreview::mouseMoveEvent( TQMouseEvent *e )
{
    if ( m_boundingrect.isValid() )
    {
        if ( m_boundingrect.contains( e->pos() ) )
            setCursor( KCursor::handCursor() );
        else
            setCursor( KCursor::arrowCursor() );
    }
}
 
void PosterPreview::mousePressEvent( TQMouseEvent *e )
{
    if ( e->button() == TQt::LeftButton && m_boundingrect.isValid() )
    {
        if ( m_boundingrect.contains( e->pos() ) )
        {
            int c, r;
            c = ( e->pos().x()-m_boundingrect.x() )/( m_boundingrect.width()/m_cols ) + 1;
            r = m_rows - ( e->pos().y()-m_boundingrect.y() )/( m_boundingrect.height()/m_rows );
            int pagenum = ( r-1 )*m_cols+c;
 
            if ( m_selectedpages.find( pagenum ) == m_selectedpages.end() ||
                    !( e->state() & TQt::ShiftButton ) )
            {
                if ( !( e->state() & TQt::ShiftButton ) )
                    m_selectedpages.clear();
                m_selectedpages.append( pagenum );
                update();
                emitSelectedPages();
            }
        }
        else if ( m_selectedpages.count() > 0 )
        {
            m_selectedpages.clear();
            update();
            emitSelectedPages();
        }
    }
}
 
void PosterPreview::slotProcessStderr( TDEProcess*, char *buf, int len )
{
    m_buffer.append( TQCString( buf, len ) );
}
 
void PosterPreview::slotProcessExited( TDEProcess* )
{
    if ( m_process->normalExit() && m_process->exitStatus() == 0 )
        parseBuffer();
    else
        m_rows = m_cols = 0;
 
    m_dirty = false;
    update();
}
 
void PosterPreview::setPosterSize( int s )
{
    setPosterSize( pageSizeToPageName( KPrinter::PageSize( s ) ) );
}
 
void PosterPreview::setPosterSize( const TQString& s )
{
    if ( m_postersize != s )
    {
        m_selectedpages.clear();
        m_postersize = s;
        setDirty();
        emitSelectedPages();
    }
}
 
void PosterPreview::setMediaSize( int s )
{
    setMediaSize( pageSizeToPageName( ( KPrinter::PageSize )s ) );
}
 
void PosterPreview::setMediaSize( const TQString& s )
{
    if ( m_mediasize != s )
    {
        m_selectedpages.clear();
        m_mediasize = s;
        setDirty();
        emitSelectedPages();
    }
}
 
void PosterPreview::setCutMargin( int value )
{
    m_cutmargin = value;
    setDirty();
}
 
void PosterPreview::setSelectedPages( const TQString& s )
{
    TQStringList l = TQStringList::split( ",", s, false );
    m_selectedpages.clear();
    for ( TQStringList::ConstIterator it=l.begin(); it!=l.end(); ++it )
    {
        int p;
        if ( ( p = ( *it ).find( '-' ) ) == -1 )
            m_selectedpages.append( ( *it ).toInt() );
        else
        {
            int p1 = ( *it ).left( p ).toInt(), p2 = ( *it ).mid( p+1 ).toInt();
            for ( int i=p1; i<=p2; i++ )
                m_selectedpages.append( i );
        }
    }
    update();
}
 
void PosterPreview::emitSelectedPages()
{
    TQString s;
    if ( m_selectedpages.count() > 0 )
    {
        for ( TQValueList<int>::ConstIterator it=m_selectedpages.begin(); it!=m_selectedpages.end(); ++it )
            s.append( TQString::number( *it ) + "," );
        s.truncate( s.length()-1 );
    }
    emit selectionChanged( s );
}
 
#include "posterpreview.moc"