kutils/kprintpreview.cpp

   1 /*
   2  *  This file is part of the KDE libraries
   3  *  Copyright (c) 2007 Alex Merry <alex.merry@kdemail.net>
   4  *
   5  *  This library is free software; you can redistribute it and/or
   6  *  modify it under the terms of the GNU Library General Public
   7  *  License version 2 as published by the Free Software Foundation.
   8  *
   9  *  This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU Library General Public License
  15  *  along with this library; see the file COPYING.LIB.  If not, write to
  16  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  *  Boston, MA 02110-1301, USA.
  18  **/
  19
  20 #include "kprintpreview.h"
  21
  22 #include <QtCore/QFile>
  23 #include <QtGui/QLabel>
  24 #include <QtGui/QPrinter>
  25 #include <QtGui/QShowEvent>
  26
  27 #include <kmimetypetrader.h>
  28 #include <kparts/part.h>
  29 #include <kpluginfactory.h>
  30 #include <kpluginloader.h>
  31 #include <kservice.h>
  32 #include <ktempdir.h>
  33 #include <kdebug.h>
  34
  35
  36 class KPrintPreviewPrivate
  37 {
  38 public:
  39     KPrintPreviewPrivate(KPrintPreview *host, QPrinter * _printer)
  40         : q(host)
  41         , printer(_printer)
  42         , mainWidget(new QWidget(host))
  43         , previewPart(0)
  44         , failMessage(0)
  45     {
  46         if ( tempdir.exists() ) {
  47             filename = tempdir.name() + "print_preview.pdf";
  48         } else {
  49             // XXX: not portable!
  50             kWarning() << "Failed to create temporary directory";
  51             filename = "/dev/null";
  52         }
  53     }
  54
  55     void getPart();
  56     bool doPreview();
  57     void fail();
  58
  59     KPrintPreview *q;
  60
  61     QPrinter *printer;
  62     QWidget *mainWidget;
  63
  64     KTempDir tempdir;
  65     QString filename;
  66
  67     KParts::ReadOnlyPart *previewPart;
  68     QWidget *failMessage;
  69 };
  70
  71 void KPrintPreviewPrivate::getPart()
  72 {
  73     if (previewPart) {
  74         kDebug(500) << "already got a part";
  75         return;
  76     }
  77     kDebug(500) << "querying trader for application/pdf service";
  78
  79     KPluginFactory *factory(0);
  80     const KService::List offers =
  81         KMimeTypeTrader::self()->query("application/pdf", "KParts/ReadOnlyPart");
  82
  83     KService::List::ConstIterator it = offers.begin();
  84     while (!factory && it != offers.end()) {
  85         KPluginLoader loader(**it);
  86         factory = loader.factory();
  87         if (!factory) {
  88             kDebug(500) << "Loading failed:" << loader.errorString();
  89         }
  90         ++it;
  91     }
  92     if (factory) {
  93         kDebug(500) << "Trying to create a part";
  94         previewPart = factory->create<KParts::ReadOnlyPart>(q, (QVariantList() << "Print/Preview"));
  95         if (!previewPart) {
  96             kDebug(500) << "Part creation failed";
  97         }
  98     }
  99 }
 100
 101 bool KPrintPreviewPrivate::doPreview()
 102 {
 103     if (!QFile::exists(filename)) {
 104         kWarning() << "Nothing was produced to be previewed";
 105         return false;
 106     }
 107
 108     getPart();
 109     if (!previewPart) {
 110         //TODO: error dialog
 111         kWarning() << "Could not find a PDF viewer for the preview dialog";
 112         fail();
 113         return false;
 114     } else {
 115         q->setMainWidget(previewPart->widget());
 116         return previewPart->openUrl(filename);
 117     }
 118 }
 119
 120 void KPrintPreviewPrivate::fail()
 121 {
 122     if (!failMessage) {
 123         failMessage = new QLabel(i18n("Could not load print preview part"), q);
 124     }
 125     q->setMainWidget(failMessage);
 126 }
 127
 128
 129
 130
 131 KPrintPreview::KPrintPreview(QPrinter *printer, QWidget *parent)
 132     : KDialog(parent)
 133     , d(new KPrintPreviewPrivate(this, printer))
 134 {
 135     kDebug(500) << "kdeprint: creating preview dialog";
 136
 137     // Set up the dialog
 138     setCaption(i18n("Print Preview"));
 139     setButtons(KDialog::Close);
 140
 141     // Set up the printer
 142     kDebug(500) << "Will print to" << d->filename;
 143     printer->setOutputFileName(d->filename);
 144 }
 145
 146 KPrintPreview::~KPrintPreview()
 147 {
 148     delete d;
 149 }
 150
 151 void KPrintPreview::showEvent(QShowEvent *event)
 152 {
 153     if (!event->spontaneous()) {
 154         // being shown for the first time
 155         if (!d->doPreview()) {
 156             event->accept();
 157             return;
 158         }
 159     }
 160     KDialog::showEvent(event);
 161 }
 162
 163 #include "kprintpreview.moc"
 164
 165
 166