diff --git a/kate/addons/kate/filetemplates/plugin/filetemplates.cpp b/kate/addons/kate/filetemplates/plugin/filetemplates.cpp
index 784be29c..851ece6f 100644
--- a/kate/addons/kate/filetemplates/plugin/filetemplates.cpp
+++ b/kate/addons/kate/filetemplates/plugin/filetemplates.cpp
@@ -477,7 +477,7 @@ void KateFileTemplates::slotOpenTemplate( const KUrl &url )
 
 QWidget *KateFileTemplates::parentWindow()
 {
-  return dynamic_cast<QWidget*>(application()->activeMainWindow());
+  return qobject_cast<QWidget*>(application()->activeMainWindow());
 }
 
 // The next part are tools to aid the creation and editing of templates
diff --git a/kate/part/completion/expandingtree/expandingwidgetmodel.cpp b/kate/part/completion/expandingtree/expandingwidgetmodel.cpp
index e5671f43..ea64e9e0 100644
--- a/kate/part/completion/expandingtree/expandingwidgetmodel.cpp
+++ b/kate/part/completion/expandingtree/expandingwidgetmodel.cpp
@@ -358,12 +358,12 @@ int ExpandingWidgetModel::basicRowHeight( const QModelIndex& idx_ ) const
 {
   QModelIndex idx(firstColumn(idx_));
     
-    ExpandingDelegate* delegate = dynamic_cast<ExpandingDelegate*>( treeView()->itemDelegate(idx) );
-    if( !delegate || !idx.isValid() ) {
+  ExpandingDelegate* delegate = qobject_cast<ExpandingDelegate*>( treeView()->itemDelegate(idx) );
+  if( !delegate || !idx.isValid() ) {
     kDebug( 13035 ) << "ExpandingWidgetModel::basicRowHeight: Could not get delegate";
     return 15;
-    }
-    return delegate->basicSizeHint( idx ).height();
+  }
+  return delegate->basicSizeHint( idx ).height();
 }
 
 
diff --git a/kate/src/app/katemdi.cpp b/kate/src/app/katemdi.cpp
index 533c8bc2..d4557b3e 100644
--- a/kate/src/app/katemdi.cpp
+++ b/kate/src/app/katemdi.cpp
@@ -473,7 +473,7 @@ namespace KateMDI
     if (ev->type() == QEvent::ContextMenu)
     {
       QContextMenuEvent *e = (QContextMenuEvent *) ev;
-      KMultiTabBarTab *bt = dynamic_cast<KMultiTabBarTab*>(obj);
+      KMultiTabBarTab *bt = qobject_cast<KMultiTabBarTab*>(obj);
       if (bt)
       {
         //kDebug() << "Request for popup";
@@ -487,7 +487,7 @@ namespace KateMDI
           KMenu *p = new KMenu (this);
 
           if (!w->plugin.isNull()) {
-            Kate::PluginConfigPageInterface* pcpi=dynamic_cast<Kate::PluginConfigPageInterface*>(w->plugin.data());
+            Kate::PluginConfigPageInterface* pcpi=qobject_cast<Kate::PluginConfigPageInterface*>(w->plugin.data());
             if (pcpi) {
               if (pcpi->configPages()>0)
                 p->addAction(i18n("Configure ..."))->setData(20);
@@ -559,7 +559,7 @@ namespace KateMDI
     // configure actionCollection
     if (id==20) {
       if (!w->plugin.isNull()) {
-          Kate::PluginConfigPageInterface* pcpi=dynamic_cast<Kate::PluginConfigPageInterface*>(w->plugin.data());
+          Kate::PluginConfigPageInterface* pcpi=qobject_cast<Kate::PluginConfigPageInterface*>(w->plugin.data());
           if (pcpi) {
             if (pcpi->configPages()>0)
               emit sigShowPluginConfigPage(pcpi,0);
diff --git a/keditbookmarks/bookmarklistview.cpp b/keditbookmarks/bookmarklistview.cpp
index 00219b48..3a8e2439 100644
--- a/keditbookmarks/bookmarklistview.cpp
+++ b/keditbookmarks/bookmarklistview.cpp
@@ -93,7 +93,7 @@ void BookmarkListView::setModel(QAbstractItemModel * model)
 
 KBookmarkModel* BookmarkListView::bookmarkModel() const
 {
-    return dynamic_cast<KBookmarkModel*>(QTreeView::model());
+    return qobject_cast<KBookmarkModel*>(QTreeView::model());
 }
 
 KBookmark BookmarkListView::bookmarkForIndex(const QModelIndex & idx) const
diff --git a/keditbookmarks/kebsearchline.cpp b/keditbookmarks/kebsearchline.cpp
index c8a9f61e..f71e5893 100644
--- a/keditbookmarks/kebsearchline.cpp
+++ b/keditbookmarks/kebsearchline.cpp
@@ -66,8 +66,8 @@ KViewSearchLine::KViewSearchLine(QWidget *parent, QAbstractItemView *v) :
 
     setClearButtonShown(true);
 
-    d->treeView = dynamic_cast<QTreeView *>(v);
-    d->listView = dynamic_cast<QListView *>(v);
+    d->treeView = qobject_cast<QTreeView *>(v);
+    d->listView = qobject_cast<QListView *>(v);
 
     connect(this, SIGNAL(textChanged(QString)),
             this, SLOT(queueSearch(QString)));
@@ -184,8 +184,8 @@ void KViewSearchLine::setView(QAbstractItemView *v)
         disconnect(model(), SIGNAL(modelReset()), this, SLOT(slotModelReset()));
     }
 
-    d->treeView = dynamic_cast<QTreeView *>(v);
-    d->listView = dynamic_cast<QListView *>(v);
+    d->treeView = qobject_cast<QTreeView *>(v);
+    d->listView = qobject_cast<QListView *>(v);
 
     if(view()) {
         connect(view(), SIGNAL(destroyed()),
diff --git a/keditbookmarks/toplevel.h b/keditbookmarks/toplevel.h
index dcd8b80d..49b70ff4 100644
--- a/keditbookmarks/toplevel.h
+++ b/keditbookmarks/toplevel.h
@@ -65,7 +65,7 @@ public:
     QMenu* popupMenuFactory(const char *type)
     {
         QWidget * menu = factory()->container(type, this);
-        return dynamic_cast<QMenu *>(menu);
+        return qobject_cast<QMenu *>(menu);
     }
 
     KToggleAction* getToggleAction(const char *) const;
diff --git a/kinfocenter/infocenter.cpp b/kinfocenter/infocenter.cpp
index 2ac627d0..b46e6580 100644
--- a/kinfocenter/infocenter.cpp
+++ b/kinfocenter/infocenter.cpp
@@ -90,7 +90,7 @@ KInfoCenter::KInfoCenter() : KXmlGuiWindow( 0, Qt::WindowContextHelpButtonHint )
 	m_toolTips = new ToolTipManager(m_sideMenu);
 	setupGUI(QSize(640,480), ToolBar | Keys | Save | Create,"kinfocenterui.rc");
 
-	m_helpAction->setMenu( dynamic_cast<KMenu*>( factory()->container("help", this) ) );
+	m_helpAction->setMenu( qobject_cast<KMenu*>( factory()->container("help", this) ) );
 	menuBar()->hide();
 
 	QAction *aboutApp = actionCollection()->action("help_about_app");
diff --git a/krunner/interfaces/default/interface.cpp b/krunner/interfaces/default/interface.cpp
index 82dd9883..6d43c48d 100644
--- a/krunner/interfaces/default/interface.cpp
+++ b/krunner/interfaces/default/interface.cpp
@@ -268,7 +268,7 @@ void Interface::updateSystemActivityToolTip()
 {
     /* Set the tooltip for the Show System Activity button to include the global shortcut */
     KRunnerApp *krunnerApp = KRunnerApp::self();
-    KAction *showSystemActivityAction = dynamic_cast<KAction *>(krunnerApp->actionCollection()->action(QLatin1String( "Show System Activity" )));
+    KAction *showSystemActivityAction = qobject_cast<KAction *>(krunnerApp->actionCollection()->action(QLatin1String( "Show System Activity" )));
     if (showSystemActivityAction) {
         QString shortcut = showSystemActivityAction->globalShortcut().toString();
         if (shortcut.isEmpty()) {
diff --git a/krunner/interfaces/quicksand/qs_dialog.cpp b/krunner/interfaces/quicksand/qs_dialog.cpp
index d6b96e9b..559a9af4 100644
--- a/krunner/interfaces/quicksand/qs_dialog.cpp
+++ b/krunner/interfaces/quicksand/qs_dialog.cpp
@@ -308,7 +308,7 @@ void QsDialog::updateSystemActivityToolTip()
 {
     /* Set the tooltip for the Show System Activity button to include the global shortcut */
     KRunnerApp *krunnerApp = KRunnerApp::self();
-    KAction *showSystemActivityAction = dynamic_cast<KAction *>(krunnerApp->actionCollection()->action(QLatin1String( "Show System Activity" )));
+    KAction *showSystemActivityAction = qobject_cast<KAction *>(krunnerApp->actionCollection()->action(QLatin1String( "Show System Activity" )));
     if (showSystemActivityAction) {
         QString shortcut = showSystemActivityAction->globalShortcut().toString();
         if (shortcut.isEmpty()) {
diff --git a/ksysguard/gui/ksysguard.cpp b/ksysguard/gui/ksysguard.cpp
index 2d4a66bd..7a1bf117 100644
--- a/ksysguard/gui/ksysguard.cpp
+++ b/ksysguard/gui/ksysguard.cpp
@@ -255,7 +255,7 @@ void TopLevel::initStatusBar()
   KSGRD::SensorMgr->sendRequest( "localhost", "mem/swap/used?",
                                  (KSGRD::SensorClient*)this, 7 );
 
-  KToggleAction *sb = dynamic_cast<KToggleAction*>(action("options_show_statusbar"));
+  KToggleAction *sb = qobject_cast<KToggleAction*>(action("options_show_statusbar"));
   if (sb)
      connect(sb, SIGNAL(toggled(bool)), this, SLOT(updateStatusBar()));
   setupGUI(QSize(800,600), ToolBar | Keys | StatusBar | Save | Create);
diff --git a/kwin/composite.cpp b/kwin/composite.cpp
index 43d28805..3ce9fd92 100644
--- a/kwin/composite.cpp
+++ b/kwin/composite.cpp
@@ -779,7 +779,7 @@ bool Toplevel::setupCompositing()
     // and us setting up damage tracking.  If the client wins we won't get a damage event even
     // though the window has been painted.  To avoid this we mark the whole window as damaged
     // and schedule a repaint immediately after creating the damage object.
-    if (dynamic_cast<Unmanaged*>(this))
+    if (qobject_cast<Unmanaged*>(this))
         addDamageFull();
 
     return true;
diff --git a/kwin/deleted.cpp b/kwin/deleted.cpp
index 8c0c359d..8e40625c 100644
--- a/kwin/deleted.cpp
+++ b/kwin/deleted.cpp
@@ -71,7 +71,7 @@ void Deleted::discard()
 
 void Deleted::copyToDeleted(Toplevel* c)
 {
-    assert(dynamic_cast< Deleted* >(c) == NULL);
+    assert(qobject_cast< Deleted* >(c) == NULL);
     Toplevel::copyToDeleted(c);
     desk = c->desktop();
     contentsRect = QRect(c->clientPos(), c->clientSize());
@@ -79,7 +79,7 @@ void Deleted::copyToDeleted(Toplevel* c)
     m_layer = c->layer();
     if (WinInfo* cinfo = dynamic_cast< WinInfo* >(info))
         cinfo->disable();
-    Client* client = dynamic_cast<Client*>(c);
+    Client* client = qobject_cast<Client*>(c);
     if (client) {
         m_wasClient = true;
         no_border = client->noBorder();
diff --git a/kwin/effects.cpp b/kwin/effects.cpp
index 93e37a8c..9e643c1c 100644
--- a/kwin/effects.cpp
+++ b/kwin/effects.cpp
@@ -517,8 +517,8 @@ void EffectsHandlerImpl::slotUnmanagedAdded(Unmanaged *u)
 
 void EffectsHandlerImpl::slotClientShown(KWin::Toplevel *t)
 {
-    Q_ASSERT(dynamic_cast<Client*>(t));
-    Client *c = static_cast<Client*>(t);
+    Q_ASSERT(qobject_cast<Client*>(t));
+    Client *c = qobject_cast<Client*>(t);
     setupClientConnections(c);
     if (!c->tabGroup()) // the "window" has already been there
         emit windowAdded(c->effectWindow());
@@ -526,8 +526,8 @@ void EffectsHandlerImpl::slotClientShown(KWin::Toplevel *t)
 
 void EffectsHandlerImpl::slotUnmanagedShown(KWin::Toplevel *t)
 {   // regardless, unmanaged windows are -yet?- not synced anyway
-    Q_ASSERT(dynamic_cast<Unmanaged*>(t));
-    Unmanaged *u = static_cast<Unmanaged*>(t);
+    Q_ASSERT(qobject_cast<Unmanaged*>(t));
+    Unmanaged *u = qobject_cast<Unmanaged*>(t);
     setupUnmanagedConnections(u);
     emit windowAdded(u->effectWindow());
 }
@@ -834,7 +834,7 @@ void EffectsHandlerImpl::deleteRootProperty(long atom) const
 
 void EffectsHandlerImpl::activateWindow(EffectWindow* c)
 {
-    if (Client* cl = dynamic_cast< Client* >(static_cast<EffectWindowImpl*>(c)->window()))
+    if (Client* cl = qobject_cast< Client* >(static_cast<EffectWindowImpl*>(c)->window()))
         Workspace::self()->activateClient(cl, true);
 }
 
@@ -845,7 +845,7 @@ EffectWindow* EffectsHandlerImpl::activeWindow() const
 
 void EffectsHandlerImpl::moveWindow(EffectWindow* w, const QPoint& pos, bool snap, double snapAdjust)
 {
-    Client* cl = dynamic_cast< Client* >(static_cast<EffectWindowImpl*>(w)->window());
+    Client* cl = qobject_cast< Client* >(static_cast<EffectWindowImpl*>(w)->window());
     if (!cl || !cl->isMovable())
         return;
 
@@ -857,14 +857,14 @@ void EffectsHandlerImpl::moveWindow(EffectWindow* w, const QPoint& pos, bool sna
 
 void EffectsHandlerImpl::windowToDesktop(EffectWindow* w, int desktop)
 {
-    Client* cl = dynamic_cast< Client* >(static_cast<EffectWindowImpl*>(w)->window());
+    Client* cl = qobject_cast< Client* >(static_cast<EffectWindowImpl*>(w)->window());
     if (cl && !cl->isDesktop() && !cl->isDock())
         Workspace::self()->sendClientToDesktop(cl, desktop, true);
 }
 
 void EffectsHandlerImpl::windowToScreen(EffectWindow* w, int screen)
 {
-    Client* cl = dynamic_cast< Client* >(static_cast<EffectWindowImpl*>(w)->window());
+    Client* cl = qobject_cast< Client* >(static_cast<EffectWindowImpl*>(w)->window());
     if (cl && !cl->isDesktop() && !cl->isDock())
         Workspace::self()->sendClientToScreen(cl, screen);
 }
@@ -1017,7 +1017,7 @@ void EffectsHandlerImpl::setElevatedWindow(EffectWindow* w, bool set)
 void EffectsHandlerImpl::setTabBoxWindow(EffectWindow* w)
 {
 #ifdef KWIN_BUILD_TABBOX
-    if (Client* c = dynamic_cast< Client* >(static_cast< EffectWindowImpl* >(w)->window())) {
+    if (Client* c = qobject_cast< Client* >(static_cast< EffectWindowImpl* >(w)->window())) {
         TabBox::TabBox::self()->setCurrentClient(c);
     }
 #else
@@ -1138,7 +1138,7 @@ QRect EffectsHandlerImpl::clientArea(clientAreaOption opt, int screen, int deskt
 QRect EffectsHandlerImpl::clientArea(clientAreaOption opt, const EffectWindow* c) const
 {
     const Toplevel* t = static_cast< const EffectWindowImpl* >(c)->window();
-    if (const Client* cl = dynamic_cast< const Client* >(t))
+    if (const Client* cl = qobject_cast< const Client* >(t))
         return Workspace::self()->clientArea(opt, cl);
     else
         return Workspace::self()->clientArea(opt, t->geometry().center(), VirtualDesktopManager::self()->current());
@@ -1239,7 +1239,7 @@ void EffectsHandlerImpl::unreserveElectricBorder(ElectricBorder border, Effect *
 unsigned long EffectsHandlerImpl::xrenderBufferPicture()
 {
 #ifdef KWIN_BUILD_COMPOSITE
-    if (SceneXrender* s = dynamic_cast< SceneXrender* >(m_scene))
+    if (SceneXrender* s = qobject_cast< SceneXrender* >(m_scene))
         return s->bufferPicture();
 #endif
     return None;
@@ -1640,21 +1640,21 @@ void EffectWindowImpl::disablePainting(int reason)
 
 const EffectWindowGroup* EffectWindowImpl::group() const
 {
-    if (Client* c = dynamic_cast< Client* >(toplevel))
+    if (Client* c = qobject_cast< Client* >(toplevel))
         return c->group()->effectGroup();
     return NULL; // TODO
 }
 
 void EffectWindowImpl::refWindow()
 {
-    if (Deleted* d = dynamic_cast< Deleted* >(toplevel))
+    if (Deleted* d = qobject_cast< Deleted* >(toplevel))
         return d->refWindow();
     abort(); // TODO
 }
 
 void EffectWindowImpl::unrefWindow()
 {
-    if (Deleted* d = dynamic_cast< Deleted* >(toplevel))
+    if (Deleted* d = qobject_cast< Deleted* >(toplevel))
         return d->unrefWindow();   // delays deletion in case
     abort(); // TODO
 }
@@ -1677,7 +1677,7 @@ QRegion EffectWindowImpl::shape() const
 
 QRect EffectWindowImpl::decorationInnerRect() const
 {
-    Client *client = dynamic_cast<Client*>(toplevel);
+    Client *client = qobject_cast<Client*>(toplevel);
     return client ? client->transparentRect() : contentsRect();
 }
 
@@ -1693,7 +1693,7 @@ void EffectWindowImpl::deleteProperty(long int atom) const
 
 EffectWindow* EffectWindowImpl::findModal()
 {
-    if (Client* c = dynamic_cast< Client* >(toplevel)) {
+    if (Client* c = qobject_cast< Client* >(toplevel)) {
         if (Client* c2 = c->findModal())
             return c2->effectWindow();
     }
diff --git a/kwin/scene.cpp b/kwin/scene.cpp
index 26d43f18..1c9c0e9a 100644
--- a/kwin/scene.cpp
+++ b/kwin/scene.cpp
@@ -671,7 +671,7 @@ void Scene::Window::discardShape()
 const QRegion &Scene::Window::shape() const
 {
     if (!shape_valid) {
-        Client* c = dynamic_cast< Client* >(toplevel);
+        Client* c = qobject_cast< Client* >(toplevel);
         if (toplevel->shape() || (c != NULL && !c->mask().isEmpty())) {
             int count, order;
             XRectangle* rects = XShapeGetRectangles(display(), toplevel->frameId(),
@@ -771,7 +771,7 @@ WindowQuadList Scene::Window::buildQuads(bool force) const
     if (toplevel->clientPos() == QPoint(0, 0) && toplevel->clientSize() == toplevel->decorationRect().size())
         ret = makeQuads(WindowQuadContents, shape());  // has no decoration
     else {
-        Client *client = dynamic_cast<Client*>(toplevel);
+        Client *client = qobject_cast<Client*>(toplevel);
         QRegion contents = clientShape();
         QRegion center = toplevel->transparentRect();
         QRegion decoration = (client && decorationPlugin()->hasAlpha() ?
diff --git a/kwin/scene_xrender.cpp b/kwin/scene_xrender.cpp
index 7b57ac23..1ab08ab2 100644
--- a/kwin/scene_xrender.cpp
+++ b/kwin/scene_xrender.cpp
@@ -435,8 +435,8 @@ void SceneXrender::Window::performPaint(int mask, QRegion region, WindowPaintDat
     qreal yscale = 1;
     bool scaled = false;
 
-    Client *client = dynamic_cast<Client*>(toplevel);
-    Deleted *deleted = dynamic_cast<Deleted*>(toplevel);
+    Client *client = qobject_cast<Client*>(toplevel);
+    Deleted *deleted = qobject_cast<Deleted*>(toplevel);
     const QRect decorationRect = toplevel->decorationRect();
     if (((client && !client->noBorder()) || (deleted && !deleted->noBorder())) &&
                                                         decorationPlugin()->hasAlpha()) {
diff --git a/kwin/toplevel.cpp b/kwin/toplevel.cpp
index 50860499..514df1b6 100644
--- a/kwin/toplevel.cpp
+++ b/kwin/toplevel.cpp
@@ -294,7 +294,7 @@ void Toplevel::setReadyForPainting()
         if (compositing()) {
             addRepaintFull();
             emit windowShown(this);
-            if (Client *cl = dynamic_cast<Client*>(this)) {
+            if (Client *cl = qobject_cast<Client*>(this)) {
                 if (cl->tabGroup() && cl->tabGroup()->current() == cl)
                     cl->tabGroup()->setCurrent(cl, true);
             }
diff --git a/libs/konq/konq_operations.cpp b/libs/konq/konq_operations.cpp
index a2a61bae..c9aa430f 100644
--- a/libs/konq/konq_operations.cpp
+++ b/libs/konq/konq_operations.cpp
@@ -509,22 +509,6 @@ void KonqOperations::doDropFileCopy()
     {
         // Neither control, shift or alt are pressed => show popup menu
 
-        // TODO move this code out somehow. Allow user of KonqOperations to add his own actions...
-#if 0
-        KonqIconViewWidget *iconView = dynamic_cast<KonqIconViewWidget*>(parent());
-        bool bSetWallpaper = false;
-        if ( iconView && iconView->maySetWallpaper() && lst.count() == 1 )
-	{
-            KUrl url = lst.first();
-            KMimeType::Ptr mime = KMimeType::findByUrl( url );
-            if ( mime && ( ( KImageIO::isSupported(mime->name(), KImageIO::Reading) ) ||
-                 mime->is( "image/svg+xml" ) ) )
-            {
-                bSetWallpaper = true;
-            }
-        }
-#endif
-
         // Check what the source can do
         // we'll assume it's the same for all URLs (hack)
         // TODO: if we had a KFileItemList instead of a KUrl::List,
@@ -780,18 +764,6 @@ void KonqOperations::setOperation( KIO::Job * job, Operation method, const KUrl
         job->ui()->setWindow(parentWidget());
         connect( job, SIGNAL(result(KJob*)),
                  SLOT(slotResult(KJob*)) );
-#if 0
-        KIO::CopyJob *copyJob = dynamic_cast<KIO::CopyJob*>(job);
-        KonqIconViewWidget *iconView = dynamic_cast<KonqIconViewWidget*>(parent());
-        if (copyJob && iconView)
-        {
-            connect(copyJob, SIGNAL(aboutToCreate(KIO::Job*,QList<KIO::CopyInfo>)),
-                 this, SLOT(slotAboutToCreate(KIO::Job*,QList<KIO::CopyInfo>)));
-            // TODO move this connect into the iconview!
-            connect(this, SIGNAL(aboutToCreate(QPoint,QList<KIO::CopyInfo>)),
-                 iconView, SLOT(slotAboutToCreate(QPoint,QList<KIO::CopyInfo>)));
-        }
-#endif
     }
     else // for link
         slotResult( 0L );
diff --git a/libs/plasmaclock/calendar.cpp b/libs/plasmaclock/calendar.cpp
index 3ccb084b..8ac08cb6 100644
--- a/libs/plasmaclock/calendar.cpp
+++ b/libs/plasmaclock/calendar.cpp
@@ -432,7 +432,7 @@ void CalendarPrivate::popupMonthsMenu()
 
 void Calendar::monthTriggered()
 {
-    QAction *action = dynamic_cast<QAction*> (sender());
+    QAction *action = qobject_cast<QAction*> (sender());
 
     if (action && action->property("month").type() == QVariant::Int) {
         int newMonth = action->property("month").toInt();
diff --git a/libs/plasmagenericshell/backgrounddialog.cpp b/libs/plasmagenericshell/backgrounddialog.cpp
index 3f4e485f..1fd75f3d 100644
--- a/libs/plasmagenericshell/backgrounddialog.cpp
+++ b/libs/plasmagenericshell/backgrounddialog.cpp
@@ -376,7 +376,7 @@ void BackgroundDialog::changeBackgroundMode(int index)
     if (!w) {
         w = new QWidget(d->backgroundDialogUi.wallpaperGroup);
     } else if (w->layout()) {
-        QGridLayout *gridLayout = dynamic_cast<QGridLayout *>(w->layout());
+        QGridLayout *gridLayout = qobject_cast<QGridLayout *>(w->layout());
         if (gridLayout) {
             gridLayout->setColumnMinimumWidth(0, d->backgroundDialogUi.wallpaperTypeLabel->geometry().right());
             gridLayout->setColumnStretch(0, 0);
diff --git a/libs/taskmanager/abstractsortingstrategy.cpp b/libs/taskmanager/abstractsortingstrategy.cpp
index 27752c30..bb84668a 100644
--- a/libs/taskmanager/abstractsortingstrategy.cpp
+++ b/libs/taskmanager/abstractsortingstrategy.cpp
@@ -91,7 +91,7 @@ void AbstractSortingStrategy::handleGroup(TaskGroup *group)
 
 void AbstractSortingStrategy::removeGroup()
 {
-    TaskGroup *group = dynamic_cast<TaskGroup*>(sender());
+    TaskGroup *group = qobject_cast<TaskGroup*>(sender());
 
     if (!group) {
         return;
@@ -117,7 +117,7 @@ void AbstractSortingStrategy::check(AbstractGroupableItem *itemToCheck)
 {
     AbstractGroupableItem *item;
     if (!itemToCheck) {
-        item = dynamic_cast<AbstractGroupableItem *>(sender());
+        item = qobject_cast<AbstractGroupableItem *>(sender());
     } else {
         item = itemToCheck;
     }
diff --git a/libs/taskmanager/strategies/manualgroupingstrategy.cpp b/libs/taskmanager/strategies/manualgroupingstrategy.cpp
index 82840629..087c9d02 100644
--- a/libs/taskmanager/strategies/manualgroupingstrategy.cpp
+++ b/libs/taskmanager/strategies/manualgroupingstrategy.cpp
@@ -84,7 +84,7 @@ QList<QAction*> ManualGroupingStrategy::strategyActions(QObject *parent, Abstrac
         QAction *a = new QAction(i18n("Remove Group"), parent);
         connect(a, SIGNAL(triggered()), this, SLOT(removeGroup()));
         actionList.append(a);
-        d->tempGroup = dynamic_cast<TaskGroup*>(item);
+        d->tempGroup = qobject_cast<TaskGroup*>(item);
     }
 
     return actionList;
diff --git a/libs/taskmanager/strategies/programgroupingstrategy.cpp b/libs/taskmanager/strategies/programgroupingstrategy.cpp
index ce633757..6999733f 100644
--- a/libs/taskmanager/strategies/programgroupingstrategy.cpp
+++ b/libs/taskmanager/strategies/programgroupingstrategy.cpp
@@ -191,7 +191,7 @@ void ProgramGroupingStrategy::handleItem(AbstractGroupableItem *item)
         return;
     }
 
-    TaskItem *task = dynamic_cast<TaskItem*>(item);
+    TaskItem *task = qobject_cast<TaskItem*>(item);
     if (task && !programGrouping(task, root)) {
         //kDebug() << item->name() << "joined rootGroup ";
         root->add(item);
diff --git a/libs/taskmanager/taskactions.cpp b/libs/taskmanager/taskactions.cpp
index dbd3d518..73ee59cc 100644
--- a/libs/taskmanager/taskactions.cpp
+++ b/libs/taskmanager/taskactions.cpp
@@ -645,9 +645,9 @@ BasicMenu::BasicMenu(QWidget *parent, TaskGroup* group, GroupManager *strategy,
 
     foreach (AbstractGroupableItem * item, group->members()) {
         if (item->itemType() == GroupItemType) {
-            addMenu(new BasicMenu(this, dynamic_cast<TaskGroup*>(item), strategy));
+            addMenu(new BasicMenu(this, qobject_cast<TaskGroup*>(item), strategy));
         } else {
-            addMenu(new BasicMenu(this, dynamic_cast<TaskItem*>(item), strategy, QList <QAction*>(), QList <QAction*>(), maxWidth));
+            addMenu(new BasicMenu(this, qobject_cast<TaskItem*>(item), strategy, QList <QAction*>(), QList <QAction*>(), maxWidth));
         }
     }
     addSeparator();
diff --git a/libs/taskmanager/taskgroup.cpp b/libs/taskmanager/taskgroup.cpp
index db93ce31..06dc2462 100644
--- a/libs/taskmanager/taskgroup.cpp
+++ b/libs/taskmanager/taskgroup.cpp
@@ -168,8 +168,8 @@ int TaskGroup::totalSize()
 void TaskGroup::add(AbstractGroupableItem *item, int insertIndex)
 {
     /*    if (!item->itemType() == GroupItemType) {
-            if ((dynamic_cast<TaskItem*>(item))->task()) {
-                kDebug() << "Add item" << (dynamic_cast<TaskItem*>(item))->task()->visibleName();
+            if ((qobject_cast<TaskItem*>(item))->task()) {
+                kDebug() << "Add item" << (qobject_cast<TaskItem*>(item))->task()->visibleName();
             }
             kDebug() << " to Group " << name();
         }
@@ -253,9 +253,9 @@ void TaskGroup::add(AbstractGroupableItem *item, int insertIndex)
     //For debug
     /* foreach (AbstractGroupableItem *item, d->members) {
          if (item->itemType() == GroupItemType) {
-             kDebug() << (dynamic_cast<TaskGroup*>(item))->name();
+             kDebug() << (qobject_cast<TaskGroup*>(item))->name();
          } else {
-             kDebug() << (dynamic_cast<TaskItem*>(item))->task()->visibleName();
+             kDebug() << (qobject_cast<TaskItem*>(item))->task()->visibleName();
          }
      }*/
     emit itemAdded(item);
@@ -301,9 +301,9 @@ void TaskGroup::remove(AbstractGroupableItem *item)
 
     /*
     if (item->itemType() == GroupItemType) {
-        kDebug() << "Remove group" << (dynamic_cast<TaskGroup*>(item))->name();
-    } else if ((dynamic_cast<TaskItem*>(item))->task()) {
-        kDebug() << "Remove item" << (dynamic_cast<TaskItem*>(item))->task()->visibleName();
+        kDebug() << "Remove group" << (qobject_cast<TaskGroup*>(item))->name();
+    } else if ((qobject_cast<TaskItem*>(item))->task()) {
+        kDebug() << "Remove item" << (qobject_cast<TaskItem*>(item))->task()->visibleName();
     }
     kDebug() << "from Group: " << name();
     */
@@ -311,9 +311,9 @@ void TaskGroup::remove(AbstractGroupableItem *item)
     /* kDebug() << "GroupMembers: ";
      foreach (AbstractGroupableItem *item, d->members) {
          if (item->itemType() == GroupItemType) {
-             kDebug() << (dynamic_cast<TaskGroup*>(item))->name();
+             kDebug() << (qobject_cast<TaskGroup*>(item))->name();
          } else {
-             kDebug() << (dynamic_cast<TaskItem*>(item))->task()->visibleName();
+             kDebug() << (qobject_cast<TaskItem*>(item))->task()->visibleName();
          }
      }*/
 
diff --git a/plasma/applets/kickoff/simpleapplet/simpleapplet.cpp b/plasma/applets/kickoff/simpleapplet/simpleapplet.cpp
index 38cdc00f..cc9a7cb6 100644
--- a/plasma/applets/kickoff/simpleapplet/simpleapplet.cpp
+++ b/plasma/applets/kickoff/simpleapplet/simpleapplet.cpp
@@ -803,7 +803,7 @@ void MenuLauncherApplet::actionTriggered(QAction *action)
         return;
     }
     for (QWidget* w = action->parentWidget(); w; w = w->parentWidget()) {
-        if (Kickoff::MenuView *view = dynamic_cast<Kickoff::MenuView*>(w)) {
+        if (Kickoff::MenuView *view = qobject_cast<Kickoff::MenuView*>(w)) {
             view->actionTriggered(action);
             break;
         }
diff --git a/plasma/dataengines/apps/appsengine.cpp b/plasma/dataengines/apps/appsengine.cpp
index a644d0f2..7ae476fd 100644
--- a/plasma/dataengines/apps/appsengine.cpp
+++ b/plasma/dataengines/apps/appsengine.cpp
@@ -47,7 +47,7 @@ void AppsEngine::sycocaChanged(const QStringList &changes)
 
 Plasma::Service *AppsEngine::serviceForSource(const QString &name)
 {
-    AppSource *source = dynamic_cast<AppSource*>(containerForSource(name));
+    AppSource *source = qobject_cast<AppSource*>(containerForSource(name));
     // if source does not exist, return null service
     if (!source) {
         return Plasma::DataEngine::serviceForSource(name);
diff --git a/plasma/dataengines/statusnotifieritem/statusnotifieritem_engine.cpp b/plasma/dataengines/statusnotifieritem/statusnotifieritem_engine.cpp
index 562b59e8..f89a98c8 100644
--- a/plasma/dataengines/statusnotifieritem/statusnotifieritem_engine.cpp
+++ b/plasma/dataengines/statusnotifieritem/statusnotifieritem_engine.cpp
@@ -43,7 +43,7 @@ StatusNotifierItemEngine::~StatusNotifierItemEngine()
 
 Plasma::Service* StatusNotifierItemEngine::serviceForSource(const QString &name)
 {
-    StatusNotifierItemSource *source = dynamic_cast<StatusNotifierItemSource*>(containerForSource(name));
+    StatusNotifierItemSource *source = qobject_cast<StatusNotifierItemSource*>(containerForSource(name));
     // if source does not exist, return null service
     if (!source) {
         return Plasma::DataEngine::serviceForSource(name);
diff --git a/plasma/dataengines/tasks/tasksengine.cpp b/plasma/dataengines/tasks/tasksengine.cpp
index b2b4cc14..6c4b3077 100644
--- a/plasma/dataengines/tasks/tasksengine.cpp
+++ b/plasma/dataengines/tasks/tasksengine.cpp
@@ -34,7 +34,7 @@ TasksEngine::~TasksEngine()
 
 Plasma::Service *TasksEngine::serviceForSource(const QString &name)
 {
-    TaskSource *source = dynamic_cast<TaskSource*>(containerForSource(name));
+    TaskSource *source = qobject_cast<TaskSource*>(containerForSource(name));
     // if source does not exist or it represents a startup task, return a null service
     if (!source || !source->task()) {
         return Plasma::DataEngine::serviceForSource(name);
diff --git a/plasma/shells/plasma-desktop/panelappletoverlay.cpp b/plasma/shells/plasma-desktop/panelappletoverlay.cpp
index 10839596..0e0085bf 100644
--- a/plasma/shells/plasma-desktop/panelappletoverlay.cpp
+++ b/plasma/shells/plasma-desktop/panelappletoverlay.cpp
@@ -268,7 +268,7 @@ void PanelAppletOverlay::mouseMoveEvent(QMouseEvent *event)
         //kDebug() << "checking view" << view << m_applet->view();
 
         if (!view) {
-            view = dynamic_cast<Plasma::View*>(parent());
+            view = qobject_cast<Plasma::View*>(parent());
         }
 
         if (!view) {
diff --git a/systemsettings/app/SettingsBase.cpp b/systemsettings/app/SettingsBase.cpp
index 15c54224..04f902fd 100644
--- a/systemsettings/app/SettingsBase.cpp
+++ b/systemsettings/app/SettingsBase.cpp
@@ -144,7 +144,7 @@ void SettingsBase::initToolBar()
     setupGUI(Save|Create,QString());
     menuBar()->hide();
     // Toolbar & Configuration
-    helpActionMenu->setMenu( dynamic_cast<KMenu*>( factory()->container("help", this) ) );
+    helpActionMenu->setMenu( qobject_cast<KMenu*>( factory()->container("help", this) ) );
     setMinimumSize(620,430);
     toolBar()->setMovable(false); // We don't allow any changes
     changeToolBar( BaseMode::Search | BaseMode::Configure | BaseMode::Quit );