# kio Library API Documentation

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# 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 <qpushbutton.h>
    00015 #include <qwhatsthis.h>
    00016 #include <qtimer.h>
    00017
    00018 #include <kapplication.h>
    00019 #include <kconfig.h>
    00020 #include <kglobal.h>
    00021 #include <kiconloader.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     QVBoxLayout *vb = new QVBoxLayout( this, KDialog::marginHint() );
    00043
    00044     imageLabel = new QLabel( this );
    00045     imageLabel->setFrameStyle( QFrame::Panel | QFrame::Sunken );
    00046     imageLabel->setAlignment( Qt::AlignHCenter | Qt::AlignVCenter );
    00047     imageLabel->setSizePolicy( QSizePolicy( QSizePolicy::Preferred, QSizePolicy::Preferred ) );
    00048     vb->addWidget( imageLabel, 1 );
    00049
    00050     QHBoxLayout *hb = new QHBoxLayout( vb );
    00051
    00052     autoPreview = new QCheckBox( i18n("&Automatic preview"), this );
    00053     autoPreview->setChecked( autoMode );
    00054     hb->addWidget( autoPreview );
    00055     connect( autoPreview, SIGNAL(toggled(bool)), SLOT(toggleAuto(bool)) );
    00056
    00057     previewButton = new QPushButton( i18n("&Preview"), this );
    00058     hb->addWidget( previewButton );
    00059     connect( previewButton, SIGNAL(clicked()), SLOT(showPreview()) );
    00060
    00061     timer = new QTimer( this );
    00062     connect( timer, SIGNAL(timeout()), SLOT(showPreview()) );
    00063 }
    00064
    00065 KImageFilePreview::~KImageFilePreview()
    00066 {
    00067     if ( m_job )
    00068         m_job->kill();
    00069
    00070     KConfig *config = KGlobal::config();
    00071     KConfigGroupSaver cs( config, ConfigGroup );
    00072     config->writeEntry( "Automatic Preview", autoPreview->isChecked() );
    00073 }
    00074
    00075 // called via KPreviewWidgetBase interface
    00076 void KImageFilePreview::showPreview( const KURL& url )
    00077 {
    00078     showPreview( url, false );
    00079 }
    00080
    00081 void KImageFilePreview::showPreview( const KURL &url, bool force )
    00082 {
    00083     if ( url.isMalformed() ) {
    00084         clearPreview();
    00085         return;
    00086     }
    00087
    00088     if ( url != currentURL || force )
    00089     {
    00090         clearPreview();
    00091         currentURL = url;
    00092
    00093         if ( autoMode || force )
    00094         {
    00095             int w = imageLabel->contentsRect().width() - 4;
    00096             int h = imageLabel->contentsRect().height() - 4;
    00097
    00098             m_job =  createJob( url, w, h );
    00099             connect( m_job, SIGNAL( result( KIO::Job * )),
    00100                      this, SLOT( slotResult( KIO::Job * )));
    00101             connect( m_job, SIGNAL( gotPreview( const KFileItem*,
    00102                                                 const QPixmap& )),
    00103                      SLOT( gotPreview( const KFileItem*, const QPixmap& ) ));
    00104
    00105             connect( m_job, SIGNAL( failed( const KFileItem* )),
    00106                      this, SLOT( slotFailed( const KFileItem* ) ));
    00107         }
    00108     }
    00109 }
    00110
    00111 void KImageFilePreview::toggleAuto( bool a )
    00112 {
    00113     autoMode = a;
    00114     if ( autoMode )
    00115     {
    00116         showPreview( currentURL, true );
    00117     }
    00118 }
    00119
    00120 void KImageFilePreview::resizeEvent( QResizeEvent * )
    00121 {
    00122     timer->start( 100, true ); // forces a new preview
    00123 }
    00124
    00125 QSize KImageFilePreview::sizeHint() const
    00126 {
    00127     return QSize( 20, 200 ); // otherwise it ends up huge???
    00128 }
    00129
    00130 KIO::PreviewJob * KImageFilePreview::createJob( const KURL& url, int w, int h )
    00131 {
    00132     KURL::List urls;
    00133     urls.append( url );
    00134     return KIO::filePreview( urls, w, h, 0, 0, true, false );
    00135 }
    00136
    00137 void KImageFilePreview::gotPreview( const KFileItem* item, const QPixmap& pm )
    00138 {
    00139     if ( item->url() == currentURL ) // should always be the case
    00140         imageLabel->setPixmap( pm );
    00141 }
    00142
    00143 void KImageFilePreview::slotFailed( const KFileItem* item )
    00144 {
    00145     if ( item->isDir() )
    00146         imageLabel->clear();
    00147     else if ( item->url() == currentURL ) // should always be the case
    00148         imageLabel->setPixmap( SmallIcon( "file_broken", KIcon::SizeLarge,
    00149                                           KIcon::DisabledState ));
    00150 }
    00151
    00152 void KImageFilePreview::slotResult( KIO::Job *job )
    00153 {
    00154     if ( job == m_job )
    00155         m_job = 0L;
    00156 }
    00157
    00158 void KImageFilePreview::clearPreview()
    00159 {
    00160     if ( m_job ) {
    00161         m_job->kill();
    00162         m_job = 0L;
    00163     }
    00164
    00165     imageLabel->clear();
    00166 //     currentURL = KURL();
    00167 }
    00168
    00169 void KImageFilePreview::virtual_hook( int id, void* data )
    00170 { KPreviewWidgetBase::virtual_hook( id, data ); }
    00171
    00172 #include "kimagefilepreview.moc"

This file is part of the documentation for kdelibs Version 3.1.5.
Documentation copyright © 1996-2002 the KDE developers.
Generated on Wed Jan 28 13:13:37 2004 by doxygen 1.3.4 written by Dimitri van Heesch, © 1997-2001