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I have here a working KPrintPreview class.  It's a KDialog, and is used=20
as follows:

QPrinter printer;
KPrintPreview preview(&printer, this); // where "this" is a QWidget
doSomePrinting(printer);
preview.exec();

Basically, you use it almost identically to a QPrintDialog, except that=20
you exec() the dialog after you've done the printing rather than=20
before.

It uses any available KPart that advertises that it can deal with=20
application/pdf (eg: Okular).  Note that I had to delete the kghostview=20
desktop file to make this work, since kghostview is broken for me.

It was quite straightforward to adapt kolourpaint to use QPrinter and=20
KPrintPreview, for testing.

I temporarily named the library kdeprint2, so as not to interfere with=20
kdeprint.

Attached are a patch for kdelibs and the modifications I made to get=20
kolourpaint to work.

Obviously the class could be made better in various ways, but it=20
demonstrates a working print preview and an API for it.

Alex


PS: please keep discussions about the printing dialog in a separate=20
thread, unless they directly relate to print preview.


=2D-=20
KDE: http://www.kde.org
Ubuntu/Kubuntu: http://www.ubuntu.org http://www.kubuntu.org

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Index: mainWindow/kpMainWindow_File.cpp
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=2D-- mainWindow/kpMainWindow_File.cpp	(revision 716349)
+++ mainWindow/kpMainWindow_File.cpp	(working copy)
@@ -37,6 +37,8 @@
 #include <qpixmap.h>
 #include <qsize.h>
 #include <QtDBus>
+#include <QPrinter>
+#include <QPrintDialog>
=20
 #include <kapplication.h>
 #include <kaction.h>
@@ -52,7 +54,7 @@
 #include <kio/netaccess.h>
 #include <klocale.h>
 #include <kmessagebox.h>
=2D#include <kprinter.h>
+#include <kdeprint2/kprintpreview.h>
 #include <krecentfilesaction.h>
 #include <kscan.h>
 #include <kstandardshortcut.h>
@@ -66,7 +68,9 @@
 #include <kpDocumentMetaInfoDialog.h>
 #include <kpDocumentSaveOptionsWidget.h>
 #include <kpPixmapFX.h>
+#if 0
 #include <kpPrintDialogPage.h>
+#endif
 #include <kpView.h>
 #include <kpViewManager.h>
=20
@@ -1054,7 +1058,7 @@ bool kpMainWindow::slotReload ()
=20
=20
 // private
=2Dvoid kpMainWindow::sendFilenameToPrinter (KPrinter *printer)
+void kpMainWindow::sendFilenameToPrinter (QPrinter &printer)
 {
     KUrl url =3D d->document->url ();
     if (!url.isEmpty ())
@@ -1069,22 +1073,19 @@ void kpMainWindow::sendFilenameToPrinter
             fileName.truncate (dot);
=20
     #if DEBUG_KP_MAIN_WINDOW
=2D        kDebug () << "kpMainWindow::sendFilenameToPrinter() fileName=3D"
+        kDebug () << "fileName=3D"
                    << fileName
                    << " dir=3D"
                    << url.directory ()
                    << endl;
     #endif
=2D        printer->setDocName (fileName);
=2D        printer->setDocFileName (fileName);
=2D        printer->setDocDirectory (url.directory ());
+        printer.setDocName (fileName);
     }
 }
=20
=20
 // private
=2Dvoid kpMainWindow::sendImageToPrinter (KPrinter *printer,
=2D        bool showPrinterSetupDialog)
+void kpMainWindow::sendImageToPrinter (QPrinter &printer)
 {
     // Get image to be printed.
     kpImage image =3D d->document->imageWithSelection ();
@@ -1149,8 +1150,8 @@ void kpMainWindow::sendImageToPrinter (K
     //     m   m       m =3D margin
     //     m   m
     //     mmmmm
=2D    const int printerWidthMM =3D printer->widthMM ();
=2D    const int printerHeightMM =3D printer->heightMM ();
+    const int printerWidthMM =3D printer.widthMM ();
+    const int printerHeightMM =3D printer.heightMM ();
 #if DEBUG_KP_MAIN_WINDOW
     kDebug () << "\tprinter: widthMM=3D" << printerWidthMM
                << " heightMM=3D" << printerHeightMM
@@ -1229,21 +1230,11 @@ void kpMainWindow::sendImageToPrinter (K
     Q_ASSERT (dpiX =3D=3D dpiY);
=20
=20
=2D    // QPrinter::setResolution() has to be called before QPrinter::setup=
().
=2D    printer->setResolution (qMax (1, qRound (dpiX)));
+    printer.setResolution (qMax (1, qRound (dpiX)));
=20
=20
     sendFilenameToPrinter (printer);
=20
=2D    if (showPrinterSetupDialog)
=2D    {
=2D        // The user can mutate margins at their own risk in this dialog.
=2D        // It doesn't seem to affect the size of the page as reported
=2D        // by QPaintDeviceMetrics::{width,height}MM().  COMPAT: fix comm=
ent - no more QPaintDeviceMetrics
=2D        if (!printer->setup (this))
=2D            return;
=2D    }
=2D
=20
     double originX =3D 0, originY =3D 0;
=20
@@ -1251,7 +1242,7 @@ void kpMainWindow::sendImageToPrinter (K
     //
     // Only call this method after the user has set the print options i.e.
     // after the print dialog ("printer->setup()") has been accepted.
=2D    if (kpPrintDialogPage::shouldPrintImageCenteredOnPage (printer))
+    /*if (kpPrintDialogPage::shouldPrintImageCenteredOnPage (printer))
     {
         originX =3D
             (printerWidthMM * dpiX / KP_MILLIMETERS_PER_INCH - image.width=
 ())
@@ -1259,7 +1250,7 @@ void kpMainWindow::sendImageToPrinter (K
         originY =3D
             (printerHeightMM * dpiY / KP_MILLIMETERS_PER_INCH - image.heig=
ht ())
                 / 2;
=2D    }
+    }*/
=20
 #if DEBUG_KP_MAIN_WINDOW
     kDebug () << "\torigin: x=3D" << originX << " y=3D" << originY;
@@ -1268,7 +1259,7 @@ void kpMainWindow::sendImageToPrinter (K
=20
     // Send image to printer.
     QPainter painter;
=2D    painter.begin (printer);
+    painter.begin (&printer);
     painter.drawPixmap (qRound (originX), qRound (originY), image);
     painter.end ();
 }
@@ -1279,10 +1270,12 @@ void kpMainWindow::slotPrint ()
 {
     toolEndShape ();
=20
=2D    KPrinter printer;
=2D    printer.addDialogPage (new kpPrintDialogPage (this));
+    QPrinter printer;
+    //printer.addDialogPage (new kpPrintDialogPage (this));
+    QPrintDialog printDialog(&printer, this);
+    printDialog.exec();
=20
=2D    sendImageToPrinter (&printer, true/*showPrinterSetupDialog*/);
+    sendImageToPrinter (printer);
 }
=20
 // private slot
@@ -1293,12 +1286,13 @@ void kpMainWindow::slotPrintPreview ()
     // Do not specify "false" to KPrinter::<ctor>()'s "restore" arg,
     // since we want to use the same KPrinter::options(), set by
     // kpPrintDialogPage.
=2D    KPrinter printer;
+    QPrinter printer;
+
+    KPrintPreview preview(&printer, this);
=20
=2D    // TODO: pass "this" as parent
=2D    printer.setPreviewOnly (true);
+    sendImageToPrinter (printer);
=20
=2D    sendImageToPrinter (&printer, false/*don't showPrinterSetupDialog*/);
+    preview.exec();
 }
=20
=20
Index: mainWindow/kpMainWindow.h
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=2D-- mainWindow/kpMainWindow.h	(revision 716349)
+++ mainWindow/kpMainWindow.h	(working copy)
@@ -362,8 +362,8 @@ private slots:
     bool slotReload ();
=20
 private:
=2D    void sendFilenameToPrinter (KPrinter *printer);
=2D    void sendImageToPrinter (KPrinter *printer, bool showPrinterSetupDia=
log);
+    void sendFilenameToPrinter (QPrinter &printer);
+    void sendImageToPrinter (QPrinter &printer);
=20
 private slots:
     void slotPrint ();
Index: CMakeLists.txt
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=2D-- CMakeLists.txt	(revision 716349)
+++ CMakeLists.txt	(working copy)
@@ -155,7 +155,7 @@ ${CMAKE_CURRENT_SOURCE_DIR}/dialogs/imag
 ${CMAKE_CURRENT_SOURCE_DIR}/dialogs/imagelib/transforms/kpTransformSkewDia=
log.cpp
 ${CMAKE_CURRENT_SOURCE_DIR}/dialogs/kpColorSimilarityDialog.cpp
 ${CMAKE_CURRENT_SOURCE_DIR}/dialogs/kpDocumentSaveOptionsPreviewDialog.cpp
=2D${CMAKE_CURRENT_SOURCE_DIR}/dialogs/kpPrintDialogPage.cpp
+#${CMAKE_CURRENT_SOURCE_DIR}/dialogs/kpPrintDialogPage.cpp
 ${CMAKE_CURRENT_SOURCE_DIR}/document/kpDocument.cpp
 ${CMAKE_CURRENT_SOURCE_DIR}/document/kpDocument_Open.cpp
 ${CMAKE_CURRENT_SOURCE_DIR}/document/kpDocument_Save.cpp
@@ -332,7 +332,7 @@ set(kolourpaint_lgpl_SRCS
=20
 kde4_add_library(kolourpaint_lgpl SHARED ${kolourpaint_lgpl_SRCS})
=20
=2Dtarget_link_libraries(kolourpaint_lgpl ${KDE4_KDEPRINT_LIBS})
+target_link_libraries(kolourpaint_lgpl ${KDE4_KDEUI_LIBS} ${KDE4_KIO_LIBS}=
 kdeprint2)
 set_target_properties(kolourpaint_lgpl PROPERTIES VERSION ${GENERIC_LIB_VE=
RSION} SOVERSION ${GENERIC_LIB_SOVERSION})
=20
 install(TARGETS kolourpaint_lgpl DESTINATION ${LIB_INSTALL_DIR})

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Index: kdeprint2/kprintpreview.h
===================================================================
--- kdeprint2/kprintpreview.h	(revision 0)
+++ kdeprint2/kprintpreview.h	(revision 0)
@@ -0,0 +1,45 @@
+/*
+ *  This file is part of the KDE libraries
+ *  Copyright (c) 2007 Alex Merry <huntedhacker@tiscali.co.uk>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License version 2 as published by the Free Software Foundation.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public License
+ *  along with this library; see the file COPYING.LIB.  If not, write to
+ *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA 02110-1301, USA.
+ **/
+
+#ifndef KPRINTPREVIEW_H
+#define KPRINTPREVIEW_H
+
+#include <kdeprint2/kdeprint2_export.h>
+
+#include <kdialog.h>
+
+class KPrintPreviewPrivate;
+
+class KDEPRINT2_EXPORT KPrintPreview : public KDialog
+{
+    Q_OBJECT
+
+public:
+    explicit KPrintPreview(QPrinter *printer, QWidget *parent = 0);
+    virtual ~KPrintPreview();
+
+    void showEvent(QShowEvent *event);
+
+private:
+    KPrintPreviewPrivate * const d;
+};
+
+
+#endif // KPRINTPREVIEW_H
+
Index: kdeprint2/kdeprint2_export.h
===================================================================
--- kdeprint2/kdeprint2_export.h	(revision 0)
+++ kdeprint2/kdeprint2_export.h	(revision 0)
@@ -0,0 +1,46 @@
+/*  This file is part of the KDE project
+    Copyright (C) 2007 David Faure <faure@kde.org>
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+*/
+
+#ifndef KDEPRINT2_EXPORT_H
+#define KDEPRINT2_EXPORT_H
+
+/* needed for KDE_EXPORT and KDE_IMPORT macros */
+#include <kdemacros.h>
+
+#ifndef KDEPRINT2_EXPORT
+# if defined(MAKE_KDEPRINT2_LIB)
+/* We are building this library */
+#  define KDEPRINT2_EXPORT KDE_EXPORT
+# else
+/* We are using this library */
+#  define KDEPRINT2_EXPORT KDE_IMPORT
+# endif
+#endif
+
+# ifndef KDEPRINT2_EXPORT_DEPRECATED
+#  define KDEPRINT2_EXPORT_DEPRECATED KDE_DEPRECATED KDEPRINT2_EXPORT
+# endif
+# ifndef KDEPRINT2_MANAGEMENT_EXPORT_DEPRECATED
+#  define KDEPRINT2_MANAGEMENT_EXPORT_DEPRECATED KDE_DEPRECATED KDEPRINT2_MANAGEMENT_EXPORT
+# endif
+# ifndef KDEPRINT2_MANAGEMENT_MODULE_EXPORT_DEPRECATED
+#  define KDEPRINT2_MANAGEMENT_MODULE_EXPORT_DEPRECATED KDE_DEPRECATED KDEPRINT2_MANAGEMENT_MODULE_EXPORT
+# endif
+
+#endif
Index: kdeprint2/kprintpreview.cpp
===================================================================
--- kdeprint2/kprintpreview.cpp	(revision 0)
+++ kdeprint2/kprintpreview.cpp	(revision 0)
@@ -0,0 +1,165 @@
+/*
+ *  This file is part of the KDE libraries
+ *  Copyright (c) 2007 Alex Merry <huntedhacker@tiscali.co.uk>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License version 2 as published by the Free Software Foundation.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public License
+ *  along with this library; see the file COPYING.LIB.  If not, write to
+ *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA 02110-1301, USA.
+ **/
+
+#include "kprintpreview.h"
+
+#include <QtCore/QFile>
+#include <QtGui/QLabel>
+#include <QtGui/QPrinter>
+#include <QtGui/QShowEvent>
+
+#include <kmimetypetrader.h>
+#include <kparts/part.h>
+#include <kpluginfactory.h>
+#include <kpluginloader.h>
+#include <kservice.h>
+#include <ktempdir.h>
+
+
+class KPrintPreviewPrivate
+{
+public:
+    KPrintPreviewPrivate(KPrintPreview *host, QPrinter * _printer)
+        : q(host)
+        , printer(_printer)
+        , mainWidget(new QWidget(host))
+        , previewPart(0)
+        , failMessage(0)
+    {
+        if ( tempdir.exists() ) {
+            filename = tempdir.name() + "print_preview.pdf";
+        } else {
+            // XXX: not portable!
+            kWarning() << "Failed to create temporary directory";
+            filename = "/dev/null";
+        }
+    }
+
+    void getPart();
+    bool doPreview();
+    void fail();
+
+    KPrintPreview *q;
+
+    QPrinter *printer;
+    QWidget *mainWidget;
+
+    KTempDir tempdir;
+    QString filename;
+
+    KParts::ReadOnlyPart *previewPart;
+    QWidget *failMessage;
+};
+
+void KPrintPreviewPrivate::getPart()
+{
+    if (previewPart) {
+        kDebug(500) << "already got a part";
+        return;
+    }
+    kDebug(500) << "querying trader for application/pdf service";
+
+    KPluginFactory *factory(0);
+    KService::List offers =
+        KMimeTypeTrader::self()->query("application/pdf", "KParts/ReadOnlyPart");
+
+    KService::List::ConstIterator it = offers.begin();
+    while (!factory && it != offers.end()) {
+        KPluginLoader loader(**it);
+        factory = loader.factory();
+        if (!factory) {
+            kDebug(500) << "Loading failed:" << loader.errorString();
+        }
+        ++it;
+    }
+    if (factory) {
+        kDebug(500) << "Trying to create a part";
+        previewPart = factory->create<KParts::ReadOnlyPart>(q, (QVariantList() << "Print/Preview"));
+        if (!previewPart) {
+            kDebug(500) << "Part creation failed";
+        }
+    }
+}
+
+bool KPrintPreviewPrivate::doPreview()
+{
+    if (!QFile::exists(filename)) {
+        kWarning() << "Nothing was produced to be previewed";
+        return false;
+    }
+
+    getPart();
+    if (!previewPart) {
+        //TODO: error dialog
+        kWarning() << "Could not find a PDF viewer for the preview dialog";
+        fail();
+        return false;
+    } else {
+        q->setMainWidget(previewPart->widget());
+        return previewPart->openUrl(filename);
+    }
+}
+
+void KPrintPreviewPrivate::fail()
+{
+    if (!failMessage) {
+        failMessage = new QLabel(i18n("Could not load print preview part"), q);
+    }
+    q->setMainWidget(failMessage);
+}
+
+
+
+
+KPrintPreview::KPrintPreview(QPrinter *printer, QWidget *parent)
+    : KDialog(parent)
+    , d(new KPrintPreviewPrivate(this, printer))
+{
+    kDebug(500) << "kdeprint: creating preview dialog";
+
+    // Set up the dialog
+    setCaption(i18n("Print Preview"));
+    setButtons(KDialog::Close);
+
+    // Set up the printer
+    kDebug(500) << "Will print to" << d->filename;
+    printer->setOutputFileName(d->filename);
+}
+
+KPrintPreview::~KPrintPreview()
+{
+    delete d;
+}
+
+void KPrintPreview::showEvent(QShowEvent *event)
+{
+    if (!event->spontaneous()) {
+        // being shown for the first time
+        if (!d->doPreview()) {
+            event->accept();
+            return;
+        }
+    }
+    KDialog::showEvent(event);
+}
+
+#include "kprintpreview.moc"
+
+
+
Index: kdeprint2/CMakeLists.txt
===================================================================
--- kdeprint2/CMakeLists.txt	(revision 0)
+++ kdeprint2/CMakeLists.txt	(revision 0)
@@ -0,0 +1,32 @@
+project(kdeprint2)
+
+
+set(kdeprint2_LIB_SRCS
+   kprintpreview.cpp
+)
+
+include_directories(${KDE4_KDEUI_INCLUDES} ${KDE4_KPARTS_INCLUDES})
+
+
+kde4_add_library(kdeprint2 SHARED ${kdeprint2_LIB_SRCS})
+
+target_link_libraries(kdeprint2 ${KDE4_KDEUI_LIBS} ${KDE4_KPARTS_LIBS} )
+
+set_target_properties(kdeprint2 PROPERTIES VERSION ${KDE_NON_GENERIC_LIB_VERSION} SOVERSION ${KDE_NON_GENERIC_LIB_SOVERSION} )
+install(TARGETS kdeprint2
+             RUNTIME DESTINATION ${BIN_INSTALL_DIR}
+             LIBRARY DESTINATION ${LIB_INSTALL_DIR}
+             ARCHIVE DESTINATION ${LIB_INSTALL_DIR}
+)
+
+########### install files ###############
+
+install( FILES
+   kprintpreview.h
+   kdeprint2_export.h
+   DESTINATION ${INCLUDE_INSTALL_DIR}/kdeprint2
+)
+
+
+
+
Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt	(revision 716348)
+++ CMakeLists.txt	(working copy)
@@ -180,6 +180,7 @@ add_subdirectory( mimetypes  )
 add_subdirectory( doc  )
 add_subdirectory( kinit  )
 add_subdirectory( kdeprint  )
+add_subdirectory( kdeprint2  )
 add_subdirectory( threadweaver )
 add_subdirectory( sonnet  )
 add_subdirectory( khtml  )

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