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KUtils

kprintpreview.cpp

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00001 /*
00002  *  This file is part of the KDE libraries
00003  *  Copyright (c) 2007 Alex Merry <alex.merry@kdemail.net>
00004  *
00005  *  This library is free software; you can redistribute it and/or
00006  *  modify it under the terms of the GNU Library General Public
00007  *  License version 2 as published by the Free Software Foundation.
00008  *
00009  *  This library is distributed in the hope that it will be useful,
00010  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012  *  Library General Public License for more details.
00013  *
00014  *  You should have received a copy of the GNU Library General Public License
00015  *  along with this library; see the file COPYING.LIB.  If not, write to
00016  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00017  *  Boston, MA 02110-1301, USA.
00018  **/
00019 
00020 #include "kprintpreview.h"
00021 
00022 #include <QtCore/QFile>
00023 #include <QtGui/QLabel>
00024 #include <QtGui/QPrinter>
00025 #include <QtGui/QShowEvent>
00026 
00027 #include <kmimetypetrader.h>
00028 #include <kparts/part.h>
00029 #include <kpluginfactory.h>
00030 #include <kpluginloader.h>
00031 #include <kservice.h>
00032 #include <ktempdir.h>
00033 #include <kdebug.h>
00034 
00035 
00036 class KPrintPreviewPrivate
00037 {
00038 public:
00039     KPrintPreviewPrivate(KPrintPreview *host, QPrinter * _printer)
00040         : q(host)
00041         , printer(_printer)
00042         , mainWidget(new QWidget(host))
00043         , previewPart(0)
00044         , failMessage(0)
00045     {
00046         if ( tempdir.exists() ) {
00047             filename = tempdir.name() + "print_preview.pdf";
00048         } else {
00049             // XXX: not portable!
00050             kWarning() << "Failed to create temporary directory";
00051             filename = "/dev/null";
00052         }
00053     }
00054 
00055     void getPart();
00056     bool doPreview();
00057     void fail();
00058 
00059     KPrintPreview *q;
00060 
00061     QPrinter *printer;
00062     QWidget *mainWidget;
00063 
00064     KTempDir tempdir;
00065     QString filename;
00066 
00067     KParts::ReadOnlyPart *previewPart;
00068     QWidget *failMessage;
00069 };
00070 
00071 void KPrintPreviewPrivate::getPart()
00072 {
00073     if (previewPart) {
00074         kDebug(500) << "already got a part";
00075         return;
00076     }
00077     kDebug(500) << "querying trader for application/pdf service";
00078 
00079     KPluginFactory *factory(0);
00080     const KService::List offers =
00081         KMimeTypeTrader::self()->query("application/pdf", "KParts/ReadOnlyPart");
00082 
00083     KService::List::ConstIterator it = offers.begin();
00084     while (!factory && it != offers.end()) {
00085         KPluginLoader loader(**it);
00086         factory = loader.factory();
00087         if (!factory) {
00088             kDebug(500) << "Loading failed:" << loader.errorString();
00089         }
00090         ++it;
00091     }
00092     if (factory) {
00093         kDebug(500) << "Trying to create a part";
00094         previewPart = factory->create<KParts::ReadOnlyPart>(q, (QVariantList() << "Print/Preview"));
00095         if (!previewPart) {
00096             kDebug(500) << "Part creation failed";
00097         }
00098     }
00099 }
00100 
00101 bool KPrintPreviewPrivate::doPreview()
00102 {
00103     if (!QFile::exists(filename)) {
00104         kWarning() << "Nothing was produced to be previewed";
00105         return false;
00106     }
00107 
00108     getPart();
00109     if (!previewPart) {
00110         //TODO: error dialog
00111         kWarning() << "Could not find a PDF viewer for the preview dialog";
00112         fail();
00113         return false;
00114     } else {
00115         q->setMainWidget(previewPart->widget());
00116         return previewPart->openUrl(filename);
00117     }
00118 }
00119 
00120 void KPrintPreviewPrivate::fail()
00121 {
00122     if (!failMessage) {
00123         failMessage = new QLabel(i18n("Could not load print preview part"), q);
00124     }
00125     q->setMainWidget(failMessage);
00126 }
00127 
00128 
00129 
00130 
00131 KPrintPreview::KPrintPreview(QPrinter *printer, QWidget *parent)
00132     : KDialog(parent)
00133     , d(new KPrintPreviewPrivate(this, printer))
00134 {
00135     kDebug(500) << "kdeprint: creating preview dialog";
00136 
00137     // Set up the dialog
00138     setCaption(i18n("Print Preview"));
00139     setButtons(KDialog::Close);
00140 
00141     // Set up the printer
00142     kDebug(500) << "Will print to" << d->filename;
00143     printer->setOutputFileName(d->filename);
00144 }
00145 
00146 KPrintPreview::~KPrintPreview()
00147 {
00148     delete d;
00149 }
00150 
00151 void KPrintPreview::showEvent(QShowEvent *event)
00152 {
00153     if (!event->spontaneous()) {
00154         // being shown for the first time
00155         if (!d->doPreview()) {
00156             event->accept();
00157             return;
00158         }
00159     }
00160     KDialog::showEvent(event);
00161 }
00162 
00163 #include "kprintpreview.moc"
00164 
00165 
00166 

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