okular/ui/fileprinterpreview.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2007 by John Layt <john@layt.net>                       *
   3  *                                                                         *
   4  *   FilePrinterPreview based on KPrintPreview (originally LGPL)           *
   5  *   Copyright (c) 2007 Alex Merry <huntedhacker@tiscali.co.uk>            *
   6  *                                                                         *
   7  *   This program is free software; you can redistribute it and/or modify  *
   8  *   it under the terms of the GNU General Public License as published by  *
   9  *   the Free Software Foundation; either version 2 of the License, or     *
  10  *   (at your option) any later version.                                   *
  11  ***************************************************************************/
  12
  13 #include "fileprinterpreview.h"
  14
  15 #include <QFile>
  16 #include <QSize>
  17 #include <QtCore/QFile>
  18 #include <QtGui/QLabel>
  19 #include <QtGui/QShowEvent>
  20
  21 #include <kmimetypetrader.h>
  22 #include <kparts/part.h>
  23 #include <kpluginfactory.h>
  24 #include <kpluginloader.h>
  25 #include <kservice.h>
  26 #include <kdebug.h>
  27
  28 using namespace Okular;
  29
  30 // This code copied from KPrintPreview by Alex Merry, adapted to do PS files instead of PDF
  31
  32 class Okular::FilePrinterPreviewPrivate
  33 {
  34 public:
  35     FilePrinterPreviewPrivate( FilePrinterPreview *host, const QString & _filename )
  36         : q(host)
  37         , mainWidget(new QWidget(host))
  38         , previewPart(0)
  39         , failMessage(0)
  40     {
  41         filename = _filename;
  42     }
  43
  44     void getPart();
  45     bool doPreview();
  46     void fail();
  47
  48     FilePrinterPreview *q;
  49
  50     QWidget *mainWidget;
  51
  52     QString filename;
  53
  54     KParts::ReadOnlyPart *previewPart;
  55     QWidget *failMessage;
  56 };
  57
  58 void FilePrinterPreviewPrivate::getPart()
  59 {
  60     if (previewPart) {
  61         kDebug(500) << "already got a part";
  62         return;
  63     }
  64     kDebug(500) << "querying trader for application/ps service";
  65
  66     KPluginFactory *factory(0);
  67     KService::List offers =
  68         KMimeTypeTrader::self()->query("application/postscript", "KParts/ReadOnlyPart");
  69
  70     KService::List::ConstIterator it = offers.begin();
  71     while (!factory && it != offers.end()) {
  72         KPluginLoader loader(**it);
  73         factory = loader.factory();
  74         if (!factory) {
  75             kDebug(500) << "Loading failed:" << loader.errorString();
  76         }
  77         ++it;
  78     }
  79     if (factory) {
  80         kDebug(500) << "Trying to create a part";
  81         previewPart = factory->create<KParts::ReadOnlyPart>(q, (QVariantList() << "Print/Preview"));
  82         if (!previewPart) {
  83             kDebug(500) << "Part creation failed";
  84         }
  85     }
  86 }
  87
  88 bool FilePrinterPreviewPrivate::doPreview()
  89 {
  90     if (!QFile::exists(filename)) {
  91         kWarning() << "Nothing was produced to be previewed";
  92         return false;
  93     }
  94
  95     getPart();
  96     if (!previewPart) {
  97         //TODO: error dialog
  98         kWarning() << "Could not find a PS viewer for the preview dialog";
  99         fail();
 100         return false;
 101     } else {
 102         q->setMainWidget(previewPart->widget());
 103         return previewPart->openUrl(filename);
 104     }
 105 }
 106
 107 void FilePrinterPreviewPrivate::fail()
 108 {
 109     if (!failMessage) {
 110         failMessage = new QLabel(i18n("Could not load print preview part"), q);
 111     }
 112     q->setMainWidget(failMessage);
 113 }
 114
 115
 116
 117
 118 FilePrinterPreview::FilePrinterPreview( const QString &filename, QWidget *parent )
 119     : KDialog( parent )
 120     , d( new FilePrinterPreviewPrivate( this, filename ) )
 121 {
 122     kDebug(500) << "kdeprint: creating preview dialog";
 123
 124     // Set up the dialog
 125     setCaption(i18n("Print Preview"));
 126     setButtons(KDialog::Close);
 127 }
 128
 129 FilePrinterPreview::~FilePrinterPreview()
 130 {
 131     delete d;
 132 }
 133
 134 void FilePrinterPreview::showEvent(QShowEvent *event)
 135 {
 136     if (!event->spontaneous()) {
 137         // being shown for the first time
 138         if (!d->doPreview()) {
 139             event->accept();
 140             return;
 141         }
 142     }
 143     KDialog::showEvent(event);
 144 }
 145
 146 #include "fileprinterpreview.moc"