Fix the issue exposed by the previous patch

Cherry-picked from a556126816

The patch de-singletons the PageController class.

The PageController is now per-document and it gets deleted when the
document is closed.

As consequence of this, the RotationJob's done signal will not be
delivered if the document has been closed, and thus this fixes the
crash.

core/document.cpp

@@ -2009,8 +2009,6 @@ Document::Document( QWidget *widget )
     d->m_undoStack = new QUndoStack(this);
     d->m_tiledObserver = 0;
 
-    connect( PageController::self(), SIGNAL(rotationFinished(int,Okular::Page*)),
-             this, SLOT(rotationFinished(int,Okular::Page*)) );
     connect( SettingsCore::self(), SIGNAL(configChanged()), this, SLOT(_o_configChanged()) );
     connect( d->m_undoStack, SIGNAL( canUndoChanged(bool) ), this, SIGNAL( canUndoChanged(bool)));
     connect( d->m_undoStack, SIGNAL( canRedoChanged(bool) ), this, SIGNAL( canRedoChanged(bool) ) );
@@ -2184,6 +2182,9 @@ bool Document::openDocument( const QString & docFile, const KUrl& url, const KMi
     }
 
     d->m_generatorName = offer->name();
+    d->m_pageController = new PageController();
+    connect( d->m_pageController, SIGNAL(rotationFinished(int,Okular::Page*)),
+             this, SLOT(rotationFinished(int,Okular::Page*)) );
 
     bool containsExternalAnnotations = false;
     foreach ( Page * p, d->m_pagesVector )
@@ -2285,6 +2286,9 @@ void Document::closeDocument()
     if ( !d->m_generator )
         return;
 
+    delete d->m_pageController;
+    d->m_pageController = 0;
+
     delete d->m_scripter;
     d->m_scripter = 0;
 

core/document_p.h

@@ -38,6 +38,7 @@ struct RunningSearch;
 
 namespace Okular {
 class ConfigInterface;
+class PageController;
 class SaveInterface;
 class Scripter;
 class View;
@@ -97,6 +98,7 @@ class DocumentPrivate
             m_saveBookmarksTimer( 0 ),
             m_generator( 0 ),
             m_generatorsLoaded( false ),
+            m_pageController( 0 ),
             m_closingLoop( 0 ),
             m_scripter( 0 ),
             m_archiveData( 0 ),
@@ -250,6 +252,7 @@ class DocumentPrivate
         // cache of the mimetype we support
         QStringList m_supportedMimeTypes;
 
+        PageController *m_pageController;
         QEventLoop *m_closingLoop;
 
         Scripter *m_scripter;

core/page.cpp

@@ -389,7 +389,7 @@ void PagePrivate::rotateAt( Rotation orientation )
 
         RotationJob *job = new RotationJob( object.m_pixmap->toImage(), object.m_rotation, m_rotation, it.key() );
         job->setPage( this );
-        PageController::self()->addRotationJob(job);
+        m_doc->m_pageController->addRotationJob(job);
     }
 
     /**
@@ -540,7 +540,7 @@ void Page::setPixmap( DocumentObserver *observer, QPixmap *pixmap, const Normali
         RotationJob *job = new RotationJob( pixmap->toImage(), Rotation0, d->m_rotation, observer );
         job->setPage( d );
         job->setRect( TilesManager::toRotatedRect( rect, d->m_rotation ) );
-        PageController::self()->addRotationJob(job);
+        d->m_doc->m_pageController->addRotationJob(job);
 
         delete pixmap;
     }

core/pagecontroller.cpp

@@ -17,8 +17,6 @@
 #include "page_p.h"
 #include "rotationjob_p.h"
 
-K_GLOBAL_STATIC( Okular::PageController, page_controller_self )
-
 using namespace Okular;
 
 PageController::PageController()
@@ -30,23 +28,16 @@ PageController::~PageController()
 {
 }
 
-PageController * PageController::self()
-{
-    return page_controller_self;
-}
-
 void PageController::addRotationJob(RotationJob *job)
 {
-    initWeaver();
+    connect( job, SIGNAL(done(ThreadWeaver::Job*)),
+             this, SLOT(imageRotationDone(ThreadWeaver::Job*)) );
     ThreadWeaver::Weaver::instance()->enqueue(job);
 }
 
 void PageController::imageRotationDone(ThreadWeaver::Job *j)
 {
-    RotationJob *job = qobject_cast< RotationJob * >(j);
-
-    if ( !job )
-        return;
+    RotationJob *job = static_cast< RotationJob * >( j );
 
     if ( job->page() )
     {
@@ -58,16 +49,4 @@ void PageController::imageRotationDone(ThreadWeaver::Job *j)
     job->deleteLater();
 }
 
-void PageController::initWeaver()
-{
-    static bool weaverInited = false;
-    if ( weaverInited )
-        return;
-
-    connect( ThreadWeaver::Weaver::instance(), SIGNAL(jobDone(ThreadWeaver::Job*)),
-             this, SLOT(imageRotationDone(ThreadWeaver::Job*)) );
-
-    weaverInited = true;
-}
-
 #include "pagecontroller_p.moc"

core/pagecontroller_p.h

@@ -21,20 +21,16 @@ namespace Okular {
 class Page;
 class RotationJob;
 
+/* There is one PageController per document. It receives notifications of
+ * completed RotationJobs */
 class PageController : public QObject
 {
     Q_OBJECT
 
     public:
-        /**
-         * Constructor. No NOT use this, NEVER! Use the static self() instead.
-         */
         PageController();
-
         ~PageController();
 
-        static PageController * self();
-
         void addRotationJob( RotationJob *job );
 
     signals:
@@ -42,9 +38,6 @@ class PageController : public QObject
 
     private slots:
         void imageRotationDone(ThreadWeaver::Job*);
-
-    private:
-        void initWeaver();
 };
 
 }