kimagefilepreview.cpp
/*
* This file is part of the KDE project
* Copyright (C) 2001 Martin R. Jones <mjones@kde.org>
* 2001 Carsten Pfeiffer <pfeiffer@kde.org>
*
* You can Freely distribute this program under the GNU Library General Public
* License. See the file "COPYING" for the exact licensing terms.
*/
#include <qlayout.h>
#include <qlabel.h>
#include <qcombobox.h>
#include <qcheckbox.h>
#include <qwhatsthis.h>
#include <qtimer.h>
#include <kapplication.h>
#include <kconfig.h>
#include <kglobal.h>
#include <kiconloader.h>
#include <kpushbutton.h>
#include <kstandarddirs.h>
#include <kdebug.h>
#include <klocale.h>
#include <kfiledialog.h>
#include <kfileitem.h>
#include <kio/previewjob.h>
#include "kimagefilepreview.h"
#include "config-kfile.h"
/**** KImageFilePreview ****/
KImageFilePreview::KImageFilePreview( QWidget *parent )
: KPreviewWidgetBase( parent ),
m_job( 0L )
{
KConfig *config = KGlobal::config();
KConfigGroupSaver cs( config, ConfigGroup );
autoMode = config->readBoolEntry( "Automatic Preview", true );
QVBoxLayout *vb = new QVBoxLayout( this, 0, KDialog::spacingHint() );
imageLabel = new QLabel( this );
imageLabel->setFrameStyle( QFrame::NoFrame );
imageLabel->setAlignment( Qt::AlignHCenter | Qt::AlignVCenter );
imageLabel->setSizePolicy( QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding) );
vb->addWidget( imageLabel );
QHBoxLayout *hb = new QHBoxLayout( 0 );
vb->addLayout( hb );
autoPreview = new QCheckBox( i18n("&Automatic preview"), this );
autoPreview->setChecked( autoMode );
hb->addWidget( autoPreview );
connect( autoPreview, SIGNAL(toggled(bool)), SLOT(toggleAuto(bool)) );
previewButton = new KPushButton( SmallIconSet("thumbnail"), i18n("&Preview"), this );
hb->addWidget( previewButton );
connect( previewButton, SIGNAL(clicked()), SLOT(showPreview()) );
timer = new QTimer( this );
connect( timer, SIGNAL(timeout()), SLOT(showPreview()) );
setSupportedMimeTypes( KIO::PreviewJob::supportedMimeTypes() );
}
KImageFilePreview::~KImageFilePreview()
{
if ( m_job )
m_job->kill();
KConfig *config = KGlobal::config();
KConfigGroupSaver cs( config, ConfigGroup );
config->writeEntry( "Automatic Preview", autoPreview->isChecked() );
}
void KImageFilePreview::showPreview()
{
// Pass a copy since clearPreview() will clear currentURL
KURL url = currentURL;
showPreview( url, true );
}
// called via KPreviewWidgetBase interface
void KImageFilePreview::showPreview( const KURL& url )
{
showPreview( url, false );
}
void KImageFilePreview::showPreview( const KURL &url, bool force )
{
if ( !url.isValid() ) {
clearPreview();
return;
}
if ( url != currentURL || force )
{
clearPreview();
currentURL = url;
if ( autoMode || force )
{
int w = imageLabel->contentsRect().width() - 4;
int h = imageLabel->contentsRect().height() - 4;
m_job = createJob( url, w, h );
if ( force ) // explicitly requested previews shall always be generated!
m_job->setIgnoreMaximumSize( true );
connect( m_job, SIGNAL( result( KIO::Job * )),
this, SLOT( slotResult( KIO::Job * )));
connect( m_job, SIGNAL( gotPreview( const KFileItem*,
const QPixmap& )),
SLOT( gotPreview( const KFileItem*, const QPixmap& ) ));
connect( m_job, SIGNAL( failed( const KFileItem* )),
this, SLOT( slotFailed( const KFileItem* ) ));
}
}
}
void KImageFilePreview::toggleAuto( bool a )
{
autoMode = a;
if ( autoMode )
{
// Pass a copy since clearPreview() will clear currentURL
KURL url = currentURL;
showPreview( url, true );
}
}
void KImageFilePreview::resizeEvent( QResizeEvent * )
{
timer->start( 100, true ); // forces a new preview
}
QSize KImageFilePreview::sizeHint() const
{
return QSize( 20, 200 ); // otherwise it ends up huge???
}
KIO::PreviewJob * KImageFilePreview::createJob( const KURL& url, int w, int h )
{
KURL::List urls;
urls.append( url );
return KIO::filePreview( urls, w, h, 0, 0, true, false );
}
void KImageFilePreview::gotPreview( const KFileItem* item, const QPixmap& pm )
{
if ( item->url() == currentURL ) // should always be the case
imageLabel->setPixmap( pm );
}
void KImageFilePreview::slotFailed( const KFileItem* item )
{
if ( item->isDir() )
imageLabel->clear();
else if ( item->url() == currentURL ) // should always be the case
imageLabel->setPixmap( SmallIcon( "file_broken", KIcon::SizeLarge,
KIcon::DisabledState ));
}
void KImageFilePreview::slotResult( KIO::Job *job )
{
if ( job == m_job )
m_job = 0L;
}
void KImageFilePreview::clearPreview()
{
if ( m_job ) {
m_job->kill();
m_job = 0L;
}
imageLabel->clear();
currentURL = KURL();
}
void KImageFilePreview::virtual_hook( int id, void* data )
{ KPreviewWidgetBase::virtual_hook( id, data ); }
#include "kimagefilepreview.moc"
KPreviewWidgetBase
Abstract baseclass for all preview widgets which shall be used via KFileDialog::setPreviewWidget(cons...
Definition: kpreviewwidgetbase.h:44

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