kprintpreview.cpp

00001 /*
00002  *  This file is part of the KDE libraries
00003  *  Copyright (c) 2001 Michael Goffioul <kdeprint@swing.be>
00004  *
00005  *
00006  *  This library is free software; you can redistribute it and/or
00007  *  modify it under the terms of the GNU Library General Public
00008  *  License version 2 as published by the Free Software Foundation.
00009  *
00010  *  This library is distributed in the hope that it will be useful,
00011  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013  *  Library General Public License for more details.
00014  *
00015  *  You should have received a copy of the GNU Library General Public License
00016  *  along with this library; see the file COPYING.LIB.  If not, write to
00017  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00018  *  Boston, MA 02110-1301, USA.
00019  **/
00020 
00021 #include "kprintpreview.h"
00022 #include "kmfactory.h"
00023 
00024 #include <qfile.h>
00025 #include <qlayout.h>
00026 #include <qvbox.h>
00027 
00028 #include <kparts/part.h>
00029 #include <kaccel.h>
00030 #include <kaction.h>
00031 #include <klibloader.h>
00032 #include <ktrader.h>
00033 #include <kuserprofile.h>
00034 #include <krun.h>
00035 #include <kapplication.h>
00036 #include <kstandarddirs.h>
00037 #include <klocale.h>
00038 #include <kmessagebox.h>
00039 #include <kdebug.h>
00040 #include <kconfig.h>
00041 #include <ktoolbar.h>
00042 #include <kmimetype.h>
00043 
00044 KPreviewProc::KPreviewProc()
00045 : KProcess()
00046 {
00047     m_bOk = false;
00048     connect(this, SIGNAL(processExited(KProcess*)), SLOT(slotProcessExited(KProcess*)));
00049 }
00050 
00051 KPreviewProc::~KPreviewProc()
00052 {
00053 }
00054 
00055 bool KPreviewProc::startPreview()
00056 {
00057     if (start())
00058     {
00059         kapp->enter_loop();
00060         return m_bOk;
00061     }
00062     else
00063         return false;
00064 }
00065 
00066 void KPreviewProc::slotProcessExited(KProcess* proc)
00067 {
00068     kapp->exit_loop();
00069     if ( proc->normalExit() && proc->exitStatus() == 0 )
00070         m_bOk = true;
00071     else
00072         kdDebug(500) << "KPreviewProc::slotProcessExited: normalExit=" << proc->normalExit()
00073             << " exitStatus=" << proc->exitStatus() << endl;
00074 }
00075 
00076 //*******************************************************************************************
00077 
00078 class KPrintPreview::KPrintPreviewPrivate
00079 {
00080 public:
00081     KPrintPreviewPrivate(KPrintPreview *dlg) : gvpart_(0)
00082     {
00083         mainwidget_ = new QWidget(dlg, "MainWidget");
00084         toolbar_ = new KToolBar(mainwidget_, "PreviewToolBar", true);
00085         actions_ = new KActionCollection(dlg);
00086         accel_ = new KAccel(dlg);
00087         previewonly_ = false;
00088     }
00089     ~KPrintPreviewPrivate()
00090     {
00091         if (gvpart_) delete gvpart_;
00092     }
00093     void plugAction(KAction *act)
00094     {
00095         act->plug(toolbar_);
00096         act->plugAccel(accel_);
00097     }
00098 
00099     KParts::ReadOnlyPart    *gvpart_;
00100     KToolBar        *toolbar_;
00101     KActionCollection   *actions_;
00102     QWidget         *mainwidget_;
00103     KAccel          *accel_;
00104     bool            previewonly_;
00105 };
00106 
00107 static KLibFactory* componentFactory()
00108 {
00109     kdDebug(500) << "kdeprint: querying trader for 'application/postscript' service" << endl;
00110     KLibFactory *factory(0);
00111     KTrader::OfferList  offers = KTrader::self()->query(QString::fromLatin1("application/postscript"), QString::fromLatin1("KParts/ReadOnlyPart"), QString::null, QString::null);
00112     for (KTrader::OfferList::ConstIterator it = offers.begin(); it != offers.end(); ++it)
00113     {
00114         KService::Ptr   service = *it;
00115         factory = KLibLoader::self()->factory(QFile::encodeName(service->library()));
00116         if (factory)
00117             break;
00118     }
00119     if (!factory)
00120     {
00121         // nothing has been found, try to load directly the KGhostview part
00122         factory = KLibLoader::self()->factory("libkghostviewpart");
00123     }
00124     return factory;
00125 }
00126 
00127 static bool continuePrint(const QString& msg_, QWidget *parent, bool previewOnly)
00128 {
00129     QString msg(msg_);
00130     if (previewOnly)
00131     {
00132         KMessageBox::error(parent, msg);
00133         return false;
00134     }
00135     else
00136     {
00137         msg.append(" ").append(i18n("Do you want to continue printing anyway?"));
00138         return (KMessageBox::warningContinueCancel(parent, msg, QString::null, KGuiItem(i18n("Print"),"fileprint")) == KMessageBox::Continue);
00139     }
00140 }
00141 
00142 //*******************************************************************************************
00143 
00144 KPrintPreview::KPrintPreview(QWidget *parent, bool previewOnly)
00145 : KDialogBase(parent, "PreviewDlg", true, i18n("Print Preview"), 0)
00146 {
00147     kdDebug(500) << "kdeprint: creating preview dialog" << endl;
00148     d = new KPrintPreviewPrivate(this);
00149     d->previewonly_ = previewOnly;
00150 
00151     // create main view and actions
00152     setMainWidget(d->mainwidget_);
00153     if (previewOnly)
00154         KStdAction::close(this, SLOT(reject()), d->actions_, "close_print");
00155     else
00156     {
00157         new KAction(i18n("Print"), "fileprint", Qt::Key_Return, this, SLOT(accept()), d->actions_, "continue_print");
00158         new KAction(i18n("Cancel"), "stop", Qt::Key_Escape, this, SLOT(reject()), d->actions_, "stop_print");
00159     }
00160 
00161 }
00162 
00163 KPrintPreview::~KPrintPreview()
00164 {
00165     delete d;
00166 }
00167 
00168 void KPrintPreview::initView(KLibFactory *factory)
00169 {
00170     // load the component
00171     d->gvpart_ = (KParts::ReadOnlyPart*)factory->create(d->mainwidget_, "gvpart", "KParts::ReadOnlyPart");
00172 
00173     // populate the toolbar
00174     if (d->previewonly_)
00175         d->plugAction(d->actions_->action("close_print"));
00176     else
00177     {
00178         d->plugAction(d->actions_->action("continue_print"));
00179         d->plugAction(d->actions_->action("stop_print"));
00180     }
00181     if (d->gvpart_)
00182     {
00183         QDomNodeList l = d->gvpart_->domDocument().elementsByTagName( "ToolBar" );
00184         if ( l.length() > 0 )
00185         {
00186             d->toolbar_->insertLineSeparator();
00187             QDomNodeList acts = l.item( 0 ).toElement().elementsByTagName( "Action" );
00188             for ( uint i=0; i<acts.length(); i++ )
00189             {
00190                 QDomElement a = acts.item( i ).toElement();
00191                 if ( a.attribute( "name" ) == "goToPage" )
00192                     continue;
00193                 KAction *act = d->gvpart_->action( a );
00194                 if ( act != 0 )
00195                     d->plugAction( act );
00196             }
00197         }
00198         /*
00199         KAction *act;
00200         d->toolbar_->insertLineSeparator();
00201         if ((act = d->gvpart_->action("zoomIn")) != 0)
00202             d->plugAction(act);
00203         if ((act = d->gvpart_->action("zoomOut")) != 0)
00204             d->plugAction(act);
00205         d->toolbar_->insertSeparator();
00206         if ((act = d->gvpart_->action("prevPage")) != 0)
00207             d->plugAction(act);
00208         if ((act = d->gvpart_->action("nextPage")) != 0)
00209             d->plugAction(act);
00210             */
00211     }
00212     d->toolbar_->setIconText(KToolBar::IconTextRight);
00213     d->toolbar_->setBarPos(KToolBar::Top);
00214     d->toolbar_->setMovingEnabled(false);
00215     //d->adjustSize();
00216 
00217     // construct the layout
00218     QVBoxLayout *l0 = new QVBoxLayout(d->mainwidget_, 0, 0);
00219     l0->addWidget(d->toolbar_, AlignTop);
00220     if (d->gvpart_)
00221         l0->addWidget(d->gvpart_->widget());
00222 
00223     resize(855, 500);
00224     setCaption(i18n("Print Preview"));
00225 }
00226 
00227 void KPrintPreview::openFile(const QString& file)
00228 {
00229     d->gvpart_->openURL(KURL(file));
00230 }
00231 
00232 bool KPrintPreview::isValid() const
00233 {
00234     return (d->gvpart_ != 0);
00235 }
00236 
00237 bool KPrintPreview::preview(const QString& file, bool previewOnly, WId parentId)
00238 {
00239     KMimeType::Ptr mime = KMimeType::findByPath( file );
00240     bool isPS = ( mime->name() == "application/postscript" );
00241     if ( !isPS )
00242         kdDebug( 500 ) << "Previewing a non PostScript file, built-in preview disabled" << endl;
00243 
00244     KConfig *conf = KMFactory::self()->printConfig();
00245     conf->setGroup("General");
00246     KLibFactory *factory(0);
00247     bool    externalPreview = conf->readBoolEntry("ExternalPreview", false);
00248     QWidget *parentW = QWidget::find(parentId);
00249     QString exe;
00250     if (!externalPreview && isPS && (factory = componentFactory()) != 0)
00251     {
00252         KPrintPreview   dlg(parentW, previewOnly);
00253         dlg.initView(factory);
00254 
00255         if (dlg.isValid())
00256         {
00257             dlg.openFile(file);
00258             return dlg.exec();
00259         }
00260         else 
00261         {
00262             // do nothing at that point: try to use the other way around by
00263             // using an external PS viewer if possible
00264         }
00265     }
00266 
00267     // Either the PS viewer component was not found, or an external
00268     // preview program has been specified
00269     KPreviewProc    proc;
00270     if (externalPreview && isPS )
00271     {
00272         exe = conf->readPathEntry("PreviewCommand", "gv");
00273         if (KStandardDirs::findExe(exe).isEmpty())
00274         {
00275             QString msg = i18n("The preview program %1 cannot be found. "
00276                                "Check that the program is correctly installed and "
00277                                "located in a directory included in your PATH "
00278                                "environment variable.").arg(exe);
00279             return continuePrint(msg, parentW, previewOnly);
00280         }
00281         proc << exe << file;
00282     }
00283     else
00284     {
00285         KService::Ptr serv = KServiceTypeProfile::preferredService( mime->name(), QString::null );
00286         if ( serv )
00287         {
00288             KURL url;
00289             url.setPath( file );
00290             QStringList args = KRun::processDesktopExec( *serv, url, false );
00291             proc << args;
00292             exe = serv->name();
00293         }
00294         else
00295         {
00296             // in that case, the PS viewer component could not be loaded and no service
00297             // could be found to view PS
00298             QString msg;
00299             if ( isPS )
00300                 msg = i18n("Preview failed: neither the internal KDE PostScript "
00301                            "viewer (KGhostView) nor any other external PostScript "
00302                            "viewer could be found.");
00303             else
00304                 msg = i18n( "Preview failed: KDE could not find any application "
00305                             "to preview files of type %1." ).arg( mime->name() );
00306 
00307             return continuePrint(msg, parentW, previewOnly);
00308         }
00309     }
00310 
00311     // start the preview process
00312     if (!proc.startPreview())
00313     {
00314         QString msg = i18n("Preview failed: unable to start program %1.").arg(exe);
00315         return continuePrint(msg, parentW, previewOnly);
00316     }
00317     else if (!previewOnly)
00318     {
00319         return (KMessageBox::questionYesNo(parentW, i18n("Do you want to continue printing?"), QString::null, KGuiItem(i18n("Print"),"fileprint"), KStdGuiItem::cancel(), "continuePrinting") == KMessageBox::Yes);
00320     }
00321     else
00322         return false;
00323 }
00324 
00325 #include "kprintpreview.moc"
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