kio Library API Documentation

kimagefilepreview.cpp

00001 /*
00002  * This file is part of the KDE project
00003  * Copyright (C) 2001 Martin R. Jones <mjones@kde.org>
00004  *               2001 Carsten Pfeiffer <pfeiffer@kde.org>
00005  *
00006  * You can Freely distribute this program under the GNU Library General Public
00007  * License. See the file "COPYING" for the exact licensing terms.
00008  */
00009 
00010 #include <qlayout.h>
00011 #include <qlabel.h>
00012 #include <qcombobox.h>
00013 #include <qcheckbox.h>
00014 #include <qwhatsthis.h>
00015 #include <qtimer.h>
00016 
00017 #include <kapplication.h>
00018 #include <kconfig.h>
00019 #include <kglobal.h>
00020 #include <kiconloader.h>
00021 #include <kpushbutton.h>
00022 #include <kstandarddirs.h>
00023 #include <kdebug.h>
00024 #include <klocale.h>
00025 #include <kfiledialog.h>
00026 #include <kfileitem.h>
00027 #include <kio/previewjob.h>
00028 
00029 #include "kimagefilepreview.h"
00030 #include "config-kfile.h"
00031 
00032 /**** KImageFilePreview ****/
00033 
00034 KImageFilePreview::KImageFilePreview( QWidget *parent )
00035     : KPreviewWidgetBase( parent ),
00036       m_job( 0L )
00037 {
00038     KConfig *config = KGlobal::config();
00039     KConfigGroupSaver cs( config, ConfigGroup );
00040     autoMode = config->readBoolEntry( "Automatic Preview", true );
00041 
00042     QGridLayout *vb = new QGridLayout( this, 2, 2, 0, KDialog::spacingHint() );
00043     vb->addItem( new QSpacerItem(KDialog::marginHint(), 0, QSizePolicy::Fixed), 0, 0 );
00044 
00045     imageLabel = new QLabel( this );
00046     imageLabel->setFrameStyle( QFrame::Panel | QFrame::Sunken );
00047     imageLabel->setAlignment( Qt::AlignHCenter | Qt::AlignVCenter );
00048     imageLabel->setSizePolicy( QSizePolicy( QSizePolicy::Preferred, QSizePolicy::Preferred ) );
00049     vb->addWidget( imageLabel, 0, 1 );
00050 
00051     QHBoxLayout *hb = new QHBoxLayout( 0 );
00052     vb->addLayout( hb, 1, 1 );
00053 
00054     autoPreview = new QCheckBox( i18n("&Automatic preview"), this );
00055     autoPreview->setChecked( autoMode );
00056     hb->addWidget( autoPreview );
00057     connect( autoPreview, SIGNAL(toggled(bool)), SLOT(toggleAuto(bool)) );
00058 
00059     previewButton = new KPushButton( SmallIconSet("thumbnail"), i18n("&Preview"), this );
00060     hb->addWidget( previewButton );
00061     connect( previewButton, SIGNAL(clicked()), SLOT(showPreview()) );
00062 
00063     timer = new QTimer( this );
00064     connect( timer, SIGNAL(timeout()), SLOT(showPreview()) );
00065 
00066     setSupportedMimeTypes( KIO::PreviewJob::supportedMimeTypes() );
00067 }
00068 
00069 KImageFilePreview::~KImageFilePreview()
00070 {
00071     if ( m_job )
00072         m_job->kill();
00073 
00074     KConfig *config = KGlobal::config();
00075     KConfigGroupSaver cs( config, ConfigGroup );
00076     config->writeEntry( "Automatic Preview", autoPreview->isChecked() );
00077 }
00078 
00079 void KImageFilePreview::showPreview()
00080 {
00081     // Pass a copy since clearPreview() will clear currentURL
00082     KURL url = currentURL;
00083     showPreview( url, true );
00084 }
00085 
00086 // called via KPreviewWidgetBase interface
00087 void KImageFilePreview::showPreview( const KURL& url )
00088 {
00089     showPreview( url, false );
00090 }
00091 
00092 void KImageFilePreview::showPreview( const KURL &url, bool force )
00093 {
00094     if ( !url.isValid() ) {
00095         clearPreview();
00096         return;
00097     }
00098 
00099     if ( url != currentURL || force )
00100     {
00101         clearPreview();
00102     currentURL = url;
00103 
00104     if ( autoMode || force )
00105     {
00106             int w = imageLabel->contentsRect().width() - 4;
00107             int h = imageLabel->contentsRect().height() - 4;
00108 
00109             m_job =  createJob( url, w, h );
00110             connect( m_job, SIGNAL( result( KIO::Job * )),
00111                      this, SLOT( slotResult( KIO::Job * )));
00112             connect( m_job, SIGNAL( gotPreview( const KFileItem*,
00113                                                 const QPixmap& )),
00114                      SLOT( gotPreview( const KFileItem*, const QPixmap& ) ));
00115 
00116             connect( m_job, SIGNAL( failed( const KFileItem* )),
00117                      this, SLOT( slotFailed( const KFileItem* ) ));
00118     }
00119     }
00120 }
00121 
00122 void KImageFilePreview::toggleAuto( bool a )
00123 {
00124     autoMode = a;
00125     if ( autoMode )
00126     {
00127         // Pass a copy since clearPreview() will clear currentURL
00128         KURL url = currentURL;
00129         showPreview( url, true );
00130     }
00131 }
00132 
00133 void KImageFilePreview::resizeEvent( QResizeEvent * )
00134 {
00135     timer->start( 100, true ); // forces a new preview
00136 }
00137 
00138 QSize KImageFilePreview::sizeHint() const
00139 {
00140     return QSize( 20, 200 ); // otherwise it ends up huge???
00141 }
00142 
00143 KIO::PreviewJob * KImageFilePreview::createJob( const KURL& url, int w, int h )
00144 {
00145     KURL::List urls;
00146     urls.append( url );
00147     return KIO::filePreview( urls, w, h, 0, 0, true, false );
00148 }
00149 
00150 void KImageFilePreview::gotPreview( const KFileItem* item, const QPixmap& pm )
00151 {
00152     if ( item->url() == currentURL ) // should always be the case
00153         imageLabel->setPixmap( pm );
00154 }
00155 
00156 void KImageFilePreview::slotFailed( const KFileItem* item )
00157 {
00158     if ( item->isDir() )
00159         imageLabel->clear();
00160     else if ( item->url() == currentURL ) // should always be the case
00161         imageLabel->setPixmap( SmallIcon( "file_broken", KIcon::SizeLarge,
00162                                           KIcon::DisabledState ));
00163 }
00164 
00165 void KImageFilePreview::slotResult( KIO::Job *job )
00166 {
00167     if ( job == m_job )
00168         m_job = 0L;
00169 }
00170 
00171 void KImageFilePreview::clearPreview()
00172 {
00173     if ( m_job ) {
00174         m_job->kill();
00175         m_job = 0L;
00176     }
00177 
00178     imageLabel->clear();
00179     currentURL = KURL();
00180 }
00181 
00182 void KImageFilePreview::virtual_hook( int id, void* data )
00183 { KPreviewWidgetBase::virtual_hook( id, data ); }
00184 
00185 #include "kimagefilepreview.moc"
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This file is part of the documentation for kio Library Version 3.4.1.
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