diff --git a/src/dolphincontextmenu.cpp b/src/dolphincontextmenu.cpp
index d4cf196b7c..af3878e1fc 100644
--- a/src/dolphincontextmenu.cpp
+++ b/src/dolphincontextmenu.cpp
@@ -66,14 +66,14 @@ DolphinContextMenu::DolphinContextMenu(DolphinMainWindow* parent,
     m_mainWindow(parent),
     m_fileInfo(fileInfo),
     m_baseUrl(baseUrl),
-    m_baseFileItem(0),
+    m_baseFileItem(nullptr),
     m_selectedItems(),
     m_selectedItemsProperties(nullptr),
     m_context(NoContext),
     m_copyToMenu(parent),
     m_customActions(),
     m_command(None),
-    m_removeAction(0)
+    m_removeAction(nullptr)
 {
     // The context menu either accesses the URLs of the selected items
     // or the items itself. To increase the performance both lists are cached.
@@ -337,7 +337,7 @@ void DolphinContextMenu::openViewportContextMenu()
     addAction(m_mainWindow->actionCollection()->action(QStringLiteral("new_tab")));
 
     // Insert 'Add to Places' entry if exactly one item is selected
-    QAction* addToPlacesAction = 0;
+    QAction* addToPlacesAction = nullptr;
     if (!placeExists(m_mainWindow->activeViewContainer()->url())) {
         addToPlacesAction = addAction(QIcon::fromTheme(QStringLiteral("bookmark-new")),
                                              i18nc("@action:inmenu Add current folder to places", "Add to Places"));
@@ -408,7 +408,7 @@ void DolphinContextMenu::insertDefaultItemActions(const KFileItemListProperties&
 
         if (showDeleteAction && showMoveToTrashAction) {
             delete m_removeAction;
-            m_removeAction = 0;
+            m_removeAction = nullptr;
             addAction(m_mainWindow->actionCollection()->action(KStandardAction::name(KStandardAction::MoveToTrash)));
             addAction(m_mainWindow->actionCollection()->action(KStandardAction::name(KStandardAction::DeleteFile)));
         } else if (showDeleteAction && !showMoveToTrashAction) {
@@ -445,7 +445,7 @@ bool DolphinContextMenu::placeExists(const QUrl& url) const
 
 QAction* DolphinContextMenu::createPasteAction()
 {
-    QAction* action = 0;
+    QAction* action = nullptr;
     const bool isDir = !m_fileInfo.isNull() && m_fileInfo.isDir();
     if (isDir && (m_selectedItems.count() == 1)) {
         const QMimeData *mimeData = QApplication::clipboard()->mimeData();
diff --git a/src/dolphindockwidget.h b/src/dolphindockwidget.h
index 8a15a04022..c4fcbf753b 100644
--- a/src/dolphindockwidget.h
+++ b/src/dolphindockwidget.h
@@ -30,8 +30,8 @@ class DolphinDockWidget : public QDockWidget
     Q_OBJECT
 
 public:
-    explicit DolphinDockWidget(const QString& title, QWidget* parent = 0, Qt::WindowFlags flags = 0);
-    explicit DolphinDockWidget(QWidget* parent = 0, Qt::WindowFlags flags = 0);
+    explicit DolphinDockWidget(const QString& title, QWidget* parent = nullptr, Qt::WindowFlags flags = nullptr);
+    explicit DolphinDockWidget(QWidget* parent = nullptr, Qt::WindowFlags flags = nullptr);
     ~DolphinDockWidget() override;
 
     /**
diff --git a/src/dolphinmainwindow.cpp b/src/dolphinmainwindow.cpp
index c35de766cc..de43bab4c2 100644
--- a/src/dolphinmainwindow.cpp
+++ b/src/dolphinmainwindow.cpp
@@ -90,20 +90,20 @@ namespace {
 }
 
 DolphinMainWindow::DolphinMainWindow() :
-    KXmlGuiWindow(0),
-    m_newFileMenu(0),
-    m_tabWidget(0),
-    m_activeViewContainer(0),
-    m_actionHandler(0),
-    m_remoteEncoding(0),
+    KXmlGuiWindow(nullptr),
+    m_newFileMenu(nullptr),
+    m_tabWidget(nullptr),
+    m_activeViewContainer(nullptr),
+    m_actionHandler(nullptr),
+    m_remoteEncoding(nullptr),
     m_settingsDialog(),
-    m_controlButton(0),
-    m_updateToolBarTimer(0),
-    m_lastHandleUrlStatJob(0),
+    m_controlButton(nullptr),
+    m_updateToolBarTimer(nullptr),
+    m_lastHandleUrlStatJob(nullptr),
 #ifndef Q_OS_WIN
-    m_terminalPanel(0),
+    m_terminalPanel(nullptr),
 #endif
-    m_placesPanel(0),
+    m_placesPanel(nullptr),
     m_tearDownFromPlacesRequested(false)
 {
     Q_INIT_RESOURCE(dolphin);
@@ -751,7 +751,7 @@ void DolphinMainWindow::editSettings()
 void DolphinMainWindow::handleUrl(const QUrl& url)
 {
     delete m_lastHandleUrlStatJob;
-    m_lastHandleUrlStatJob = 0;
+    m_lastHandleUrlStatJob = nullptr;
 
     if (url.isLocalFile() && QFileInfo(url.toLocalFile()).isDir()) {
         activeViewContainer()->setUrl(url);
@@ -771,7 +771,7 @@ void DolphinMainWindow::handleUrl(const QUrl& url)
 
 void DolphinMainWindow::slotHandleUrlStatFinished(KJob* job)
 {
-    m_lastHandleUrlStatJob = 0;
+    m_lastHandleUrlStatJob = nullptr;
     const KIO::UDSEntry entry = static_cast<KIO::StatJob*>(job)->statResult();
     const QUrl url = static_cast<KIO::StatJob*>(job)->url();
     if (entry.isDir()) {
@@ -912,7 +912,7 @@ void DolphinMainWindow::updateToolBar()
 
 void DolphinMainWindow::slotControlButtonDeleted()
 {
-    m_controlButton = 0;
+    m_controlButton = nullptr;
     m_updateToolBarTimer->start();
 }
 
@@ -1174,7 +1174,7 @@ void DolphinMainWindow::setupActions()
     }
 
     // setup 'Settings' menu
-    KToggleAction* showMenuBar = KStandardAction::showMenubar(0, 0, actionCollection());
+    KToggleAction* showMenuBar = KStandardAction::showMenubar(nullptr, nullptr, actionCollection());
     connect(showMenuBar, &KToggleAction::triggered,                   // Fixes #286822
             this, &DolphinMainWindow::toggleShowMenuBar, Qt::QueuedConnection);
     KStandardAction::preferences(this, SLOT(editSettings()), actionCollection());
@@ -1436,10 +1436,10 @@ void DolphinMainWindow::createControlButton()
 void DolphinMainWindow::deleteControlButton()
 {
     delete m_controlButton;
-    m_controlButton = 0;
+    m_controlButton = nullptr;
 
     delete m_updateToolBarTimer;
-    m_updateToolBarTimer = 0;
+    m_updateToolBarTimer = nullptr;
 }
 
 bool DolphinMainWindow::addActionToMenu(QAction* action, QMenu* menu)
diff --git a/src/dolphinpart.cpp b/src/dolphinpart.cpp
index b3b47304e1..c8bc8b647d 100644
--- a/src/dolphinpart.cpp
+++ b/src/dolphinpart.cpp
@@ -60,8 +60,8 @@ K_PLUGIN_FACTORY(DolphinPartFactory, registerPlugin<DolphinPart>();)
 
 DolphinPart::DolphinPart(QWidget* parentWidget, QObject* parent, const QVariantList& args)
     : KParts::ReadOnlyPart(parent)
-      ,m_openTerminalAction(0)
-      ,m_removeAction(0)
+      ,m_openTerminalAction(nullptr)
+      ,m_removeAction(nullptr)
 {
     Q_UNUSED(args)
     setComponentData(*createAboutData(), false);
@@ -316,7 +316,7 @@ bool DolphinPart::openUrl(const QUrl &url)
     QString prettyUrl = visibleUrl.toDisplayString(QUrl::PreferLocalFile);
     emit setWindowCaption(prettyUrl);
     emit m_extension->setLocationBarUrl(prettyUrl);
-    emit started(0); // get the wheel to spin
+    emit started(nullptr); // get the wheel to spin
     m_view->setNameFilter(m_nameFilter);
     m_view->setUrl(url);
     updatePasteAction();
@@ -431,7 +431,7 @@ void DolphinPart::slotOpenContextMenu(const QPoint& pos,
 
             if (showDeleteAction && showMoveToTrashAction) {
                 delete m_removeAction;
-                m_removeAction = 0;
+                m_removeAction = nullptr;
                 editActions.append(actionCollection()->action(KStandardAction::name(KStandardAction::MoveToTrash)));
                 editActions.append(actionCollection()->action(KStandardAction::name(KStandardAction::DeleteFile)));
             } else if (showDeleteAction && !showMoveToTrashAction) {
diff --git a/src/dolphinrecenttabsmenu.cpp b/src/dolphinrecenttabsmenu.cpp
index c155632c67..f425df2180 100644
--- a/src/dolphinrecenttabsmenu.cpp
+++ b/src/dolphinrecenttabsmenu.cpp
@@ -86,7 +86,7 @@ void DolphinRecentTabsMenu::handleAction(QAction* action)
         const QByteArray state = action->data().toByteArray();
         removeAction(action);
         delete action;
-        action = 0;
+        action = nullptr;
         emit restoreClosedTab(state);
         emit closedTabsCountChanged(menu()->actions().size() - 2);
     }
diff --git a/src/dolphintabpage.h b/src/dolphintabpage.h
index b8772602d1..ba4c144d91 100644
--- a/src/dolphintabpage.h
+++ b/src/dolphintabpage.h
@@ -33,7 +33,7 @@ class DolphinTabPage : public QWidget
     Q_OBJECT
 
 public:
-    explicit DolphinTabPage(const QUrl& primaryUrl, const QUrl& secondaryUrl = QUrl(), QWidget* parent = 0);
+    explicit DolphinTabPage(const QUrl& primaryUrl, const QUrl& secondaryUrl = QUrl(), QWidget* parent = nullptr);
 
     /**
      * @return True if primary view is the active view in this tab.
diff --git a/src/dolphinviewcontainer.cpp b/src/dolphinviewcontainer.cpp
index e92ec6022f..36959a871e 100644
--- a/src/dolphinviewcontainer.cpp
+++ b/src/dolphinviewcontainer.cpp
@@ -52,14 +52,14 @@
 
 DolphinViewContainer::DolphinViewContainer(const QUrl& url, QWidget* parent) :
     QWidget(parent),
-    m_topLayout(0),
-    m_urlNavigator(0),
-    m_searchBox(0),
-    m_messageWidget(0),
-    m_view(0),
-    m_filterBar(0),
-    m_statusBar(0),
-    m_statusBarTimer(0),
+    m_topLayout(nullptr),
+    m_urlNavigator(nullptr),
+    m_searchBox(nullptr),
+    m_messageWidget(nullptr),
+    m_view(nullptr),
+    m_filterBar(nullptr),
+    m_statusBar(nullptr),
+    m_statusBarTimer(nullptr),
     m_statusBarTimestamp(),
     m_autoGrabFocus(true)
 #ifdef KActivities_FOUND
diff --git a/src/filterbar/filterbar.h b/src/filterbar/filterbar.h
index da4a0fcc17..0c7dcb6cd0 100644
--- a/src/filterbar/filterbar.h
+++ b/src/filterbar/filterbar.h
@@ -37,7 +37,7 @@ class FilterBar : public QWidget
     Q_OBJECT
 
 public:
-    explicit FilterBar(QWidget* parent = 0);
+    explicit FilterBar(QWidget* parent = nullptr);
     ~FilterBar() override;
 
     /** Called by view container to hide this **/
diff --git a/src/kitemviews/kfileitemlistview.cpp b/src/kitemviews/kfileitemlistview.cpp
index c17d543676..41f8aeade0 100644
--- a/src/kitemviews/kfileitemlistview.cpp
+++ b/src/kitemviews/kfileitemlistview.cpp
@@ -49,9 +49,9 @@ namespace {
 
 KFileItemListView::KFileItemListView(QGraphicsWidget* parent) :
     KStandardItemListView(parent),
-    m_modelRolesUpdater(0),
-    m_updateVisibleIndexRangeTimer(0),
-    m_updateIconSizeTimer(0)
+    m_modelRolesUpdater(nullptr),
+    m_updateVisibleIndexRangeTimer(nullptr),
+    m_updateIconSizeTimer(nullptr)
 {
     setAcceptDrops(true);
 
@@ -229,7 +229,7 @@ void KFileItemListView::onModelChanged(KItemModelBase* current, KItemModelBase*
     KStandardItemListView::onModelChanged(current, previous);
 
     delete m_modelRolesUpdater;
-    m_modelRolesUpdater = 0;
+    m_modelRolesUpdater = nullptr;
 
     if (current) {
         m_modelRolesUpdater = new KFileItemModelRolesUpdater(static_cast<KFileItemModel*>(current), this);
diff --git a/src/kitemviews/kfileitemlistview.h b/src/kitemviews/kfileitemlistview.h
index c1c260e93c..95ad9ba686 100644
--- a/src/kitemviews/kfileitemlistview.h
+++ b/src/kitemviews/kfileitemlistview.h
@@ -41,7 +41,7 @@ class DOLPHIN_EXPORT KFileItemListView : public KStandardItemListView
     Q_OBJECT
 
 public:
-    KFileItemListView(QGraphicsWidget* parent = 0);
+    KFileItemListView(QGraphicsWidget* parent = nullptr);
     ~KFileItemListView() override;
 
     void setPreviewsShown(bool show);
diff --git a/src/kitemviews/kfileitemmodel.cpp b/src/kitemviews/kfileitemmodel.cpp
index 8f89b89df6..08520c9f62 100644
--- a/src/kitemviews/kfileitemmodel.cpp
+++ b/src/kitemviews/kfileitemmodel.cpp
@@ -42,7 +42,7 @@
 
 KFileItemModel::KFileItemModel(QObject* parent) :
     KItemModelBase("text", parent),
-    m_dirLister(0),
+    m_dirLister(nullptr),
     m_sortDirsFirst(true),
     m_sortRole(NameRole),
     m_sortingProgressPercent(-1),
@@ -52,8 +52,8 @@ KFileItemModel::KFileItemModel(QObject* parent) :
     m_filter(),
     m_filteredItems(),
     m_requestRole(),
-    m_maximumUpdateIntervalTimer(0),
-    m_resortAllItemsTimer(0),
+    m_maximumUpdateIntervalTimer(nullptr),
+    m_resortAllItemsTimer(nullptr),
     m_pendingItemsToInsert(),
     m_groups(),
     m_expandedDirs(),
@@ -251,7 +251,7 @@ QMimeData* KFileItemModel::createMimeData(const KItemSet& indexes) const
     QList<QUrl> urls;
     QList<QUrl> mostLocalUrls;
     bool canUseMostLocalUrls = true;
-    const ItemData* lastAddedItem = 0;
+    const ItemData* lastAddedItem = nullptr;
 
     for (int index : indexes) {
         const ItemData* itemData = m_itemData.at(index);
@@ -2295,16 +2295,16 @@ const KFileItemModel::RoleInfoMap* KFileItemModel::rolesInfoMap(int& count)
 {
     static const RoleInfoMap rolesInfoMap[] = {
     //  | role         | roleType       | role translation                                | group translation           | requires Baloo   | requires indexer
-        { 0,             NoRole,          0, 0,                                             0, 0,                                     false, false },
-        { "text",        NameRole,        I18N_NOOP2_NOSTRIP("@label", "Name"),             0, 0,                                     false, false },
-        { "size",        SizeRole,        I18N_NOOP2_NOSTRIP("@label", "Size"),             0, 0,                                     false, false },
-        { "modificationtime",        ModificationTimeRole,        I18N_NOOP2_NOSTRIP("@label", "Modified"),             0, 0,                                     false, false },
-        { "creationtime",        CreationTimeRole,        I18N_NOOP2_NOSTRIP("@label", "Created"),             0, 0,                                     false, false },
-        { "accesstime",        AccessTimeRole,        I18N_NOOP2_NOSTRIP("@label", "Accessed"),             0, 0,                                     false, false },
-        { "type",        TypeRole,        I18N_NOOP2_NOSTRIP("@label", "Type"),             0, 0,                                     false, false },
-        { "rating",      RatingRole,      I18N_NOOP2_NOSTRIP("@label", "Rating"),           0, 0,                                     true,  false },
-        { "tags",        TagsRole,        I18N_NOOP2_NOSTRIP("@label", "Tags"),             0, 0,                                     true,  false },
-        { "comment",     CommentRole,     I18N_NOOP2_NOSTRIP("@label", "Comment"),          0, 0,                                     true,  false },
+        { nullptr,             NoRole,          nullptr, nullptr,                                             nullptr, nullptr,                                     false, false },
+        { "text",        NameRole,        I18N_NOOP2_NOSTRIP("@label", "Name"),             nullptr, nullptr,                                     false, false },
+        { "size",        SizeRole,        I18N_NOOP2_NOSTRIP("@label", "Size"),             nullptr, nullptr,                                     false, false },
+        { "modificationtime",        ModificationTimeRole,        I18N_NOOP2_NOSTRIP("@label", "Modified"),             nullptr, nullptr,                                     false, false },
+        { "creationtime",        CreationTimeRole,        I18N_NOOP2_NOSTRIP("@label", "Created"),             nullptr, nullptr,                                     false, false },
+        { "accesstime",        AccessTimeRole,        I18N_NOOP2_NOSTRIP("@label", "Accessed"),             nullptr, nullptr,                                     false, false },
+        { "type",        TypeRole,        I18N_NOOP2_NOSTRIP("@label", "Type"),             nullptr, nullptr,                                     false, false },
+        { "rating",      RatingRole,      I18N_NOOP2_NOSTRIP("@label", "Rating"),           nullptr, nullptr,                                     true,  false },
+        { "tags",        TagsRole,        I18N_NOOP2_NOSTRIP("@label", "Tags"),             nullptr, nullptr,                                     true,  false },
+        { "comment",     CommentRole,     I18N_NOOP2_NOSTRIP("@label", "Comment"),          nullptr, nullptr,                                     true,  false },
         { "title",       TitleRole,       I18N_NOOP2_NOSTRIP("@label", "Title"),            I18N_NOOP2_NOSTRIP("@label", "Document"), true,  true  },
         { "wordCount",   WordCountRole,   I18N_NOOP2_NOSTRIP("@label", "Word Count"),       I18N_NOOP2_NOSTRIP("@label", "Document"), true,  true  },
         { "lineCount",   LineCountRole,   I18N_NOOP2_NOSTRIP("@label", "Line Count"),       I18N_NOOP2_NOSTRIP("@label", "Document"), true,  true  },
diff --git a/src/kitemviews/kfileitemmodel.h b/src/kitemviews/kfileitemmodel.h
index 3cd119dc89..8d721aa56c 100644
--- a/src/kitemviews/kfileitemmodel.h
+++ b/src/kitemviews/kfileitemmodel.h
@@ -50,7 +50,7 @@ class DOLPHIN_EXPORT KFileItemModel : public KItemModelBase
     Q_OBJECT
 
 public:
-    explicit KFileItemModel(QObject* parent = 0);
+    explicit KFileItemModel(QObject* parent = nullptr);
     ~KFileItemModel() override;
 
     /**
diff --git a/src/kitemviews/kfileitemmodelrolesupdater.cpp b/src/kitemviews/kfileitemmodelrolesupdater.cpp
index 11d01b2cf3..a08f1ae150 100644
--- a/src/kitemviews/kfileitemmodelrolesupdater.cpp
+++ b/src/kitemviews/kfileitemmodelrolesupdater.cpp
@@ -88,12 +88,12 @@ KFileItemModelRolesUpdater::KFileItemModelRolesUpdater(KFileItemModel* model, QO
     m_pendingIndexes(),
     m_pendingPreviewItems(),
     m_previewJob(),
-    m_recentlyChangedItemsTimer(0),
+    m_recentlyChangedItemsTimer(nullptr),
     m_recentlyChangedItems(),
     m_changedItems(),
-    m_directoryContentsCounter(0)
+    m_directoryContentsCounter(nullptr)
   #ifdef HAVE_BALOO
-  , m_balooFileMonitor(0)
+  , m_balooFileMonitor(nullptr)
   #endif
 {
     Q_ASSERT(model);
@@ -296,7 +296,7 @@ void KFileItemModelRolesUpdater::setRoles(const QSet<QByteArray>& roles)
                     this, &KFileItemModelRolesUpdater::applyChangedBalooRoles);
         } else if (!hasBalooRole && m_balooFileMonitor) {
             delete m_balooFileMonitor;
-            m_balooFileMonitor = 0;
+            m_balooFileMonitor = nullptr;
         }
 #endif
 
@@ -594,7 +594,7 @@ void KFileItemModelRolesUpdater::slotPreviewFailed(const KFileItem& item)
 
 void KFileItemModelRolesUpdater::slotPreviewJobFinished()
 {
-    m_previewJob = 0;
+    m_previewJob = nullptr;
 
     if (m_state != PreviewJobRunning) {
         return;
@@ -1138,7 +1138,7 @@ void KFileItemModelRolesUpdater::killPreviewJob()
         disconnect(m_previewJob,  &KIO::PreviewJob::finished,
                    this, &KFileItemModelRolesUpdater::slotPreviewJobFinished);
         m_previewJob->kill();
-        m_previewJob = 0;
+        m_previewJob = nullptr;
         m_pendingPreviewItems.clear();
     }
 }
diff --git a/src/kitemviews/kfileitemmodelrolesupdater.h b/src/kitemviews/kfileitemmodelrolesupdater.h
index 15d46d79e6..d971a7c171 100644
--- a/src/kitemviews/kfileitemmodelrolesupdater.h
+++ b/src/kitemviews/kfileitemmodelrolesupdater.h
@@ -94,7 +94,7 @@ class DOLPHIN_EXPORT KFileItemModelRolesUpdater : public QObject
     Q_OBJECT
 
 public:
-    explicit KFileItemModelRolesUpdater(KFileItemModel* model, QObject* parent = 0);
+    explicit KFileItemModelRolesUpdater(KFileItemModel* model, QObject* parent = nullptr);
     ~KFileItemModelRolesUpdater() override;
 
     void setIconSize(const QSize& size);
diff --git a/src/kitemviews/kitemlistcontainer.cpp b/src/kitemviews/kitemlistcontainer.cpp
index 8bab6cfad2..8e64ee4933 100644
--- a/src/kitemviews/kitemlistcontainer.cpp
+++ b/src/kitemviews/kitemlistcontainer.cpp
@@ -70,8 +70,8 @@ void KItemListContainerViewport::wheelEvent(QWheelEvent* event)
 KItemListContainer::KItemListContainer(KItemListController* controller, QWidget* parent) :
     QAbstractScrollArea(parent),
     m_controller(controller),
-    m_horizontalSmoothScroller(0),
-    m_verticalSmoothScroller(0)
+    m_horizontalSmoothScroller(nullptr),
+    m_verticalSmoothScroller(nullptr)
 {
     Q_ASSERT(controller);
     controller->setParent(this);
@@ -83,10 +83,10 @@ KItemListContainer::KItemListContainer(KItemListController* controller, QWidget*
     m_verticalSmoothScroller = new KItemListSmoothScroller(verticalScrollBar(), this);
 
     if (controller->model()) {
-        slotModelChanged(controller->model(), 0);
+        slotModelChanged(controller->model(), nullptr);
     }
     if (controller->view()) {
-        slotViewChanged(controller->view(), 0);
+        slotViewChanged(controller->view(), nullptr);
     }
 
     connect(controller, &KItemListController::modelChanged,
@@ -100,7 +100,7 @@ KItemListContainer::~KItemListContainer()
     // Don't rely on the QObject-order to delete the controller, otherwise
     // the QGraphicsScene might get deleted before the view.
     delete m_controller;
-    m_controller = 0;
+    m_controller = nullptr;
 }
 
 KItemListController* KItemListContainer::controller() const
@@ -216,8 +216,8 @@ void KItemListContainer::slotViewChanged(KItemListView* current, KItemListView*
         disconnect(previous, &KItemListView::maximumItemOffsetChanged,
                    this, &KItemListContainer::updateItemOffsetScrollBar);
         disconnect(previous, &KItemListView::scrollTo, this, &KItemListContainer::scrollTo);
-        m_horizontalSmoothScroller->setTargetObject(0);
-        m_verticalSmoothScroller->setTargetObject(0);
+        m_horizontalSmoothScroller->setTargetObject(nullptr);
+        m_verticalSmoothScroller->setTargetObject(nullptr);
     }
     if (current) {
         scene->addItem(current);
@@ -257,8 +257,8 @@ void KItemListContainer::updateScrollOffsetScrollBar()
         return;
     }
 
-    KItemListSmoothScroller* smoothScroller = 0;
-    QScrollBar* scrollOffsetScrollBar = 0;
+    KItemListSmoothScroller* smoothScroller = nullptr;
+    QScrollBar* scrollOffsetScrollBar = nullptr;
     int singleStep = 0;
     int pageStep = 0;
     int maximum = 0;
@@ -308,8 +308,8 @@ void KItemListContainer::updateItemOffsetScrollBar()
         return;
     }
 
-    KItemListSmoothScroller* smoothScroller = 0;
-    QScrollBar* itemOffsetScrollBar = 0;
+    KItemListSmoothScroller* smoothScroller = nullptr;
+    QScrollBar* itemOffsetScrollBar = nullptr;
     int singleStep = 0;
     int pageStep = 0;
     if (view->scrollOrientation() == Qt::Vertical) {
diff --git a/src/kitemviews/kitemlistcontainer.h b/src/kitemviews/kitemlistcontainer.h
index dc7b19e202..c5ef855634 100644
--- a/src/kitemviews/kitemlistcontainer.h
+++ b/src/kitemviews/kitemlistcontainer.h
@@ -50,7 +50,7 @@ public:
      *                   (the parent will be set to the KItemListContainer).
      * @param parent     Optional parent widget.
      */
-    explicit KItemListContainer(KItemListController* controller, QWidget* parent = 0);
+    explicit KItemListContainer(KItemListController* controller, QWidget* parent = nullptr);
     ~KItemListContainer() override;
     KItemListController* controller() const;
 
diff --git a/src/kitemviews/kitemlistcontroller.cpp b/src/kitemviews/kitemlistcontroller.cpp
index 008b6c4c6c..61f520641c 100644
--- a/src/kitemviews/kitemlistcontroller.cpp
+++ b/src/kitemviews/kitemlistcontroller.cpp
@@ -49,13 +49,13 @@ KItemListController::KItemListController(KItemModelBase* model, KItemListView* v
     m_selectionBehavior(NoSelection),
     m_autoActivationBehavior(ActivationAndExpansion),
     m_mouseDoubleClickAction(ActivateItemOnly),
-    m_model(0),
-    m_view(0),
+    m_model(nullptr),
+    m_view(nullptr),
     m_selectionManager(new KItemListSelectionManager(this)),
     m_keyboardManager(new KItemListKeyboardSearchManager(this)),
     m_pressedIndex(-1),
     m_pressedMousePos(),
-    m_autoActivationTimer(0),
+    m_autoActivationTimer(nullptr),
     m_oldSelection(),
     m_keyboardAnchorIndex(-1),
     m_keyboardAnchorPos(0)
@@ -76,10 +76,10 @@ KItemListController::KItemListController(KItemModelBase* model, KItemListView* v
 
 KItemListController::~KItemListController()
 {
-    setView(0);
+    setView(nullptr);
     Q_ASSERT(!m_view);
 
-    setModel(0);
+    setModel(nullptr);
     Q_ASSERT(!m_model);
 }
 
@@ -1216,7 +1216,7 @@ KItemListWidget* KItemListController::hoveredWidget() const
         }
     }
 
-    return 0;
+    return nullptr;
 }
 
 KItemListWidget* KItemListController::widgetForPos(const QPointF& pos) const
@@ -1233,7 +1233,7 @@ KItemListWidget* KItemListController::widgetForPos(const QPointF& pos) const
         }
     }
 
-    return 0;
+    return nullptr;
 }
 
 void KItemListController::updateKeyboardAnchor()
diff --git a/src/kitemviews/kitemlistcontroller.h b/src/kitemviews/kitemlistcontroller.h
index ff0171a026..7c48fb18c1 100644
--- a/src/kitemviews/kitemlistcontroller.h
+++ b/src/kitemviews/kitemlistcontroller.h
@@ -88,7 +88,7 @@ public:
      * @param view   View of the controller. The ownership is passed to the controller.
      * @param parent Optional parent object.
      */
-    KItemListController(KItemModelBase* model, KItemListView* view, QObject* parent = 0);
+    KItemListController(KItemModelBase* model, KItemListView* view, QObject* parent = nullptr);
     ~KItemListController() override;
 
     void setModel(KItemModelBase* model);
diff --git a/src/kitemviews/kitemlistgroupheader.cpp b/src/kitemviews/kitemlistgroupheader.cpp
index f8576b08cf..fb92989894 100644
--- a/src/kitemviews/kitemlistgroupheader.cpp
+++ b/src/kitemviews/kitemlistgroupheader.cpp
@@ -29,7 +29,7 @@
 #include <QStyleOptionGraphicsItem>
 
 KItemListGroupHeader::KItemListGroupHeader(QGraphicsWidget* parent) :
-    QGraphicsWidget(parent, 0),
+    QGraphicsWidget(parent, nullptr),
     m_dirtyCache(true),
     m_role(),
     m_data(),
diff --git a/src/kitemviews/kitemlistgroupheader.h b/src/kitemviews/kitemlistgroupheader.h
index f720076df1..6a8bd76e86 100644
--- a/src/kitemviews/kitemlistgroupheader.h
+++ b/src/kitemviews/kitemlistgroupheader.h
@@ -42,7 +42,7 @@ class DOLPHIN_EXPORT KItemListGroupHeader : public QGraphicsWidget
     Q_OBJECT
 
 public:
-    KItemListGroupHeader(QGraphicsWidget* parent = 0);
+    KItemListGroupHeader(QGraphicsWidget* parent = nullptr);
     ~KItemListGroupHeader() override;
 
     void setRole(const QByteArray& role);
@@ -65,7 +65,7 @@ public:
     void setItemIndex(int index);
     int itemIndex() const;
 
-    void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0) override;
+    void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = nullptr) override;
 
 protected:
     virtual void paintRole(QPainter* painter, const QRectF& roleBounds, const QColor& color) = 0;
diff --git a/src/kitemviews/kitemlistselectionmanager.cpp b/src/kitemviews/kitemlistselectionmanager.cpp
index 46ffe7c139..5d7b08eeb0 100644
--- a/src/kitemviews/kitemlistselectionmanager.cpp
+++ b/src/kitemviews/kitemlistselectionmanager.cpp
@@ -31,7 +31,7 @@ KItemListSelectionManager::KItemListSelectionManager(QObject* parent) :
     m_anchorItem(-1),
     m_selectedItems(),
     m_isAnchoredSelectionActive(false),
-    m_model(0)
+    m_model(nullptr)
 {
 }
 
diff --git a/src/kitemviews/kitemlistselectionmanager.h b/src/kitemviews/kitemlistselectionmanager.h
index d8faac4cd4..54c2cc0629 100644
--- a/src/kitemviews/kitemlistselectionmanager.h
+++ b/src/kitemviews/kitemlistselectionmanager.h
@@ -51,7 +51,7 @@ public:
         Toggle
     };
 
-    KItemListSelectionManager(QObject* parent = 0);
+    KItemListSelectionManager(QObject* parent = nullptr);
     ~KItemListSelectionManager() override;
 
     void setCurrentItem(int current);
diff --git a/src/kitemviews/kitemlistview.cpp b/src/kitemviews/kitemlistview.cpp
index d268097979..71091033c9 100644
--- a/src/kitemviews/kitemlistview.cpp
+++ b/src/kitemviews/kitemlistview.cpp
@@ -67,7 +67,7 @@ QAccessibleInterface* accessibleInterfaceFactory(const QString& key, QObject* ob
         return new KItemListViewAccessible(view);
     }
 
-    return 0;
+    return nullptr;
 }
 #endif
 
@@ -80,30 +80,30 @@ KItemListView::KItemListView(QGraphicsWidget* parent) :
     m_activeTransactions(0),
     m_endTransactionAnimationHint(Animation),
     m_itemSize(),
-    m_controller(0),
-    m_model(0),
+    m_controller(nullptr),
+    m_model(nullptr),
     m_visibleRoles(),
-    m_widgetCreator(0),
-    m_groupHeaderCreator(0),
+    m_widgetCreator(nullptr),
+    m_groupHeaderCreator(nullptr),
     m_styleOption(),
     m_visibleItems(),
     m_visibleGroups(),
     m_visibleCells(),
-    m_sizeHintResolver(0),
-    m_layouter(0),
-    m_animation(0),
-    m_layoutTimer(0),
+    m_sizeHintResolver(nullptr),
+    m_layouter(nullptr),
+    m_animation(nullptr),
+    m_layoutTimer(nullptr),
     m_oldScrollOffset(0),
     m_oldMaximumScrollOffset(0),
     m_oldItemOffset(0),
     m_oldMaximumItemOffset(0),
     m_skipAutoScrollForRubberBand(false),
-    m_rubberBand(0),
+    m_rubberBand(nullptr),
     m_mousePos(),
     m_autoScrollIncrement(0),
-    m_autoScrollTimer(0),
-    m_header(0),
-    m_headerWidget(0),
+    m_autoScrollTimer(nullptr),
+    m_header(nullptr),
+    m_headerWidget(nullptr),
     m_dropIndicator()
 {
     setAcceptHoverEvents(true);
@@ -141,13 +141,13 @@ KItemListView::~KItemListView()
     // widgetCreator(). So it is mandatory to delete the group headers
     // first.
     delete m_groupHeaderCreator;
-    m_groupHeaderCreator = 0;
+    m_groupHeaderCreator = nullptr;
 
     delete m_widgetCreator;
-    m_widgetCreator = 0;
+    m_widgetCreator = nullptr;
 
     delete m_sizeHintResolver;
-    m_sizeHintResolver = 0;
+    m_sizeHintResolver = nullptr;
 }
 
 void KItemListView::setScrollOffset(qreal offset)
@@ -270,13 +270,13 @@ void KItemListView::setAutoScroll(bool enabled)
         m_autoScrollTimer->start(InitialAutoScrollDelay);
     } else if (!enabled && m_autoScrollTimer) {
         delete m_autoScrollTimer;
-        m_autoScrollTimer = 0;
+        m_autoScrollTimer = nullptr;
     }
 }
 
 bool KItemListView::autoScroll() const
 {
-    return m_autoScrollTimer != 0;
+    return m_autoScrollTimer != nullptr;
 }
 
 void KItemListView::setEnabledSelectionToggles(bool enabled)
@@ -629,7 +629,7 @@ QPixmap KItemListView::createDragPixmap(const KItemSet& indexes) const
         KItemListWidget* item = m_visibleItems.value(indexes.first());
         QGraphicsView* graphicsView = scene()->views()[0];
         if (item && graphicsView) {
-            pixmap = item->createDragPixmap(0, graphicsView);
+            pixmap = item->createDragPixmap(nullptr, graphicsView);
         }
     } else {
         // TODO: Not implemented yet. Probably extend the interface
@@ -834,12 +834,12 @@ Qt::Orientation KItemListView::scrollOrientation() const
 
 KItemListWidgetCreatorBase* KItemListView::defaultWidgetCreator() const
 {
-    return 0;
+    return nullptr;
 }
 
 KItemListGroupHeaderCreatorBase* KItemListView::defaultGroupHeaderCreator() const
 {
-    return 0;
+    return nullptr;
 }
 
 void KItemListView::initializeItemListWidget(KItemListWidget* item)
@@ -2090,7 +2090,7 @@ void KItemListView::recycleGroupHeaderForWidget(KItemListWidget* widget)
 {
     KItemListGroupHeader* header = m_visibleGroups.value(widget);
     if (header) {
-        header->setParentItem(0);
+        header->setParentItem(nullptr);
         groupHeaderCreator()->recycle(header);
         m_visibleGroups.remove(widget);
         disconnect(widget, &KItemListWidget::geometryChanged, this, &KItemListView::slotGeometryOfGroupHeaderParentChanged);
@@ -2551,7 +2551,7 @@ void KItemListView::updateSiblingsInformation(int firstIndex, int lastIndex)
             const int parents = m_model->expandedParentsCount(lastIndex + 1);
             for (int i = lastIndex; i >= firstIndex; --i) {
                 if (m_model->expandedParentsCount(i) != parents) {
-                    widget = 0;
+                    widget = nullptr;
                     break;
                 }
             }
@@ -2714,7 +2714,7 @@ void KItemListCreatorBase::pushRecycleableWidget(QGraphicsWidget* widget)
 QGraphicsWidget* KItemListCreatorBase::popRecycleableWidget()
 {
     if (m_recycleableWidgets.isEmpty()) {
-        return 0;
+        return nullptr;
     }
 
     QGraphicsWidget* widget = m_recycleableWidgets.takeLast();
@@ -2728,7 +2728,7 @@ KItemListWidgetCreatorBase::~KItemListWidgetCreatorBase()
 
 void KItemListWidgetCreatorBase::recycle(KItemListWidget* widget)
 {
-    widget->setParentItem(0);
+    widget->setParentItem(nullptr);
     widget->setOpacity(1.0);
     pushRecycleableWidget(widget);
 }
diff --git a/src/kitemviews/kitemlistview.h b/src/kitemviews/kitemlistview.h
index 3415d52ec1..e3793e10ef 100644
--- a/src/kitemviews/kitemlistview.h
+++ b/src/kitemviews/kitemlistview.h
@@ -67,7 +67,7 @@ class DOLPHIN_EXPORT KItemListView : public QGraphicsWidget
     Q_PROPERTY(qreal itemOffset READ itemOffset WRITE setItemOffset)
 
 public:
-    KItemListView(QGraphicsWidget* parent = 0);
+    KItemListView(QGraphicsWidget* parent = nullptr);
     ~KItemListView() override;
 
     /**
@@ -285,7 +285,7 @@ public:
      */
     void editRole(int index, const QByteArray& role);
 
-    void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0) override;
+    void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = nullptr) override;
 
 signals:
     void scrollOrientationChanged(Qt::Orientation current, Qt::Orientation previous);
diff --git a/src/kitemviews/kitemlistviewaccessible.cpp b/src/kitemviews/kitemlistviewaccessible.cpp
index 6f06e243e3..c593dad82c 100644
--- a/src/kitemviews/kitemlistviewaccessible.cpp
+++ b/src/kitemviews/kitemlistviewaccessible.cpp
@@ -60,7 +60,7 @@ void* KItemListViewAccessible::interface_cast(QAccessible::InterfaceType type)
     if (type == QAccessible::TableInterface) {
         return static_cast<QAccessibleTableInterface*>(this);
     }
-    return Q_NULLPTR;
+    return nullptr;
 }
 
 void KItemListViewAccessible::modelReset()
@@ -70,7 +70,7 @@ void KItemListViewAccessible::modelReset()
 QAccessibleInterface* KItemListViewAccessible::cell(int index) const
 {
     if (index < 0 || index >= view()->model()->count()) {
-        return 0;
+        return nullptr;
     }
 
     if (m_cells.size() <= index) {
@@ -93,7 +93,7 @@ QAccessibleInterface* KItemListViewAccessible::cellAt(int row, int column) const
 
 QAccessibleInterface* KItemListViewAccessible::caption() const
 {
-    return 0;
+    return nullptr;
 }
 
 QString KItemListViewAccessible::columnDescription(int) const
@@ -168,7 +168,7 @@ QList<int> KItemListViewAccessible::selectedRows() const
 
 QAccessibleInterface* KItemListViewAccessible::summary() const
 {
-    return 0;
+    return nullptr;
 }
 
 bool KItemListViewAccessible::isColumnSelected(int) const
@@ -225,7 +225,7 @@ QAccessibleInterface* KItemListViewAccessible::childAt(int x, int y) const
 QAccessibleInterface* KItemListViewAccessible::parent() const
 {
     // FIXME: return KItemListContainerAccessible here
-    return Q_NULLPTR;
+    return nullptr;
 }
 
 int KItemListViewAccessible::childCount() const
@@ -265,7 +265,7 @@ QAccessibleInterface* KItemListViewAccessible::child(int index) const
     if (index >= 0 && index < childCount()) {
         return cell(index);
     }
-    return Q_NULLPTR;
+    return nullptr;
 }
 
 // Table Cell
@@ -282,7 +282,7 @@ void* KItemListAccessibleCell::interface_cast(QAccessible::InterfaceType type)
     if (type == QAccessible::TableCellInterface) {
         return static_cast<QAccessibleTableCellInterface*>(this);
     }
-    return Q_NULLPTR;
+    return nullptr;
 }
 
 int KItemListAccessibleCell::columnExtent() const
@@ -398,7 +398,7 @@ void KItemListAccessibleCell::setText(QAccessible::Text, const QString&)
 
 QAccessibleInterface* KItemListAccessibleCell::child(int) const
 {
-    return Q_NULLPTR;
+    return nullptr;
 }
 
 bool KItemListAccessibleCell::isValid() const
@@ -408,7 +408,7 @@ bool KItemListAccessibleCell::isValid() const
 
 QAccessibleInterface* KItemListAccessibleCell::childAt(int, int) const
 {
-    return Q_NULLPTR;
+    return nullptr;
 }
 
 int KItemListAccessibleCell::childCount() const
@@ -434,7 +434,7 @@ int KItemListAccessibleCell::index() const
 
 QObject* KItemListAccessibleCell::object() const
 {
-    return 0;
+    return nullptr;
 }
 
 // Container Interface
@@ -465,7 +465,7 @@ QAccessibleInterface* KItemListContainerAccessible::child(int index) const
     if (index == 0) {
         return QAccessible::queryAccessibleInterface(container()->controller()->view());
     }
-    return Q_NULLPTR;
+    return nullptr;
 }
 
 const KItemListContainer* KItemListContainerAccessible::container() const
diff --git a/src/kitemviews/kitemlistwidget.cpp b/src/kitemviews/kitemlistwidget.cpp
index 65fc911bd9..579d8b7a2c 100644
--- a/src/kitemviews/kitemlistwidget.cpp
+++ b/src/kitemviews/kitemlistwidget.cpp
@@ -42,7 +42,7 @@ KItemListWidgetInformant::~KItemListWidgetInformant()
 }
 
 KItemListWidget::KItemListWidget(KItemListWidgetInformant* informant, QGraphicsItem* parent) :
-    QGraphicsWidget(parent, 0),
+    QGraphicsWidget(parent, nullptr),
     m_informant(informant),
     m_index(-1),
     m_selected(false),
@@ -56,9 +56,9 @@ KItemListWidget::KItemListWidget(KItemListWidgetInformant* informant, QGraphicsI
     m_styleOption(),
     m_siblingsInfo(),
     m_hoverOpacity(0),
-    m_hoverCache(0),
-    m_hoverAnimation(0),
-    m_selectionToggle(0),
+    m_hoverCache(nullptr),
+    m_hoverAnimation(nullptr),
+    m_selectionToggle(nullptr),
     m_editedRole()
 {
 }
@@ -72,7 +72,7 @@ void KItemListWidget::setIndex(int index)
 {
     if (m_index != index) {
         delete m_selectionToggle;
-        m_selectionToggle = 0;
+        m_selectionToggle = nullptr;
 
         if (m_hoverAnimation) {
             m_hoverAnimation->stop();
@@ -474,7 +474,7 @@ void KItemListWidget::slotHoverAnimationFinished()
 {
     if (!m_hovered && m_selectionToggle) {
         m_selectionToggle->deleteLater();
-        m_selectionToggle = 0;
+        m_selectionToggle = nullptr;
     }
 }
 
@@ -502,7 +502,7 @@ void KItemListWidget::setHoverOpacity(qreal opacity)
 
     if (m_hoverOpacity <= 0.0) {
         delete m_hoverCache;
-        m_hoverCache = 0;
+        m_hoverCache = nullptr;
     }
 
     update();
@@ -511,7 +511,7 @@ void KItemListWidget::setHoverOpacity(qreal opacity)
 void KItemListWidget::clearHoverCache()
 {
     delete m_hoverCache;
-    m_hoverCache = 0;
+    m_hoverCache = nullptr;
 }
 
 void KItemListWidget::drawItemStyleOption(QPainter* painter, QWidget* widget, QStyle::State styleState)
diff --git a/src/kitemviews/kitemlistwidget.h b/src/kitemviews/kitemlistwidget.h
index 1480c1acb8..06fea0e391 100644
--- a/src/kitemviews/kitemlistwidget.h
+++ b/src/kitemviews/kitemlistwidget.h
@@ -82,7 +82,7 @@ public:
      * to show the data of the custom model provided by KItemListWidget::data().
      * @reimp
      */
-    void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0) override;
+    void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = nullptr) override;
 
     void setVisibleRoles(const QList<QByteArray>& roles);
     QList<QByteArray> visibleRoles() const;
@@ -186,7 +186,7 @@ public:
      * @return Pixmap that is used when dragging an item. Per default the current state of the
      *         widget is returned as pixmap.
      */
-    virtual QPixmap createDragPixmap(const QStyleOptionGraphicsItem* option, QWidget* widget = 0);
+    virtual QPixmap createDragPixmap(const QStyleOptionGraphicsItem* option, QWidget* widget = nullptr);
 
 signals:
     void roleEditingCanceled(int index, const QByteArray& role, const QVariant& value);
diff --git a/src/kitemviews/kitemmodelbase.cpp b/src/kitemviews/kitemmodelbase.cpp
index d73468336b..983b469608 100644
--- a/src/kitemviews/kitemmodelbase.cpp
+++ b/src/kitemviews/kitemmodelbase.cpp
@@ -126,7 +126,7 @@ int KItemModelBase::expandedParentsCount(int index) const
 QMimeData* KItemModelBase::createMimeData(const KItemSet& indexes) const
 {
     Q_UNUSED(indexes);
-    return 0;
+    return nullptr;
 }
 
 int KItemModelBase::indexForKeyboardSearch(const QString& text, int startFromIndex) const
diff --git a/src/kitemviews/kitemmodelbase.h b/src/kitemviews/kitemmodelbase.h
index d604f423f4..0aa6d187f4 100644
--- a/src/kitemviews/kitemmodelbase.h
+++ b/src/kitemviews/kitemmodelbase.h
@@ -55,8 +55,8 @@ class DOLPHIN_EXPORT KItemModelBase : public QObject
     Q_OBJECT
 
 public:
-    KItemModelBase(QObject* parent = 0);
-    explicit KItemModelBase(const QByteArray& sortRole, QObject* parent = 0);
+    KItemModelBase(QObject* parent = nullptr);
+    explicit KItemModelBase(const QByteArray& sortRole, QObject* parent = nullptr);
     ~KItemModelBase() override;
 
     /** @return The number of items. */
diff --git a/src/kitemviews/kstandarditem.cpp b/src/kitemviews/kstandarditem.cpp
index f3fd258f93..d4d1fa2f91 100644
--- a/src/kitemviews/kstandarditem.cpp
+++ b/src/kitemviews/kstandarditem.cpp
@@ -25,7 +25,7 @@
 KStandardItem::KStandardItem(KStandardItem* parent) :
     m_parent(parent),
     m_children(),
-    m_model(0),
+    m_model(nullptr),
     m_data()
 {
 }
@@ -33,7 +33,7 @@ KStandardItem::KStandardItem(KStandardItem* parent) :
 KStandardItem::KStandardItem(const QString& text, KStandardItem* parent) :
     m_parent(parent),
     m_children(),
-    m_model(0),
+    m_model(nullptr),
     m_data()
 {
     setText(text);
@@ -42,7 +42,7 @@ KStandardItem::KStandardItem(const QString& text, KStandardItem* parent) :
 KStandardItem::KStandardItem(const QString& icon, const QString& text, KStandardItem* parent) :
     m_parent(parent),
     m_children(),
-    m_model(0),
+    m_model(nullptr),
     m_data()
 {
     setIcon(icon);
diff --git a/src/kitemviews/kstandarditem.h b/src/kitemviews/kstandarditem.h
index 5bb2bb36f7..fec197c06f 100644
--- a/src/kitemviews/kstandarditem.h
+++ b/src/kitemviews/kstandarditem.h
@@ -40,9 +40,9 @@ class DOLPHIN_EXPORT KStandardItem
 {
 
 public:
-    explicit KStandardItem(KStandardItem* parent = 0);
-    explicit KStandardItem(const QString& text, KStandardItem* parent = 0);
-    KStandardItem(const QString& icon, const QString& text, KStandardItem* parent = 0);
+    explicit KStandardItem(KStandardItem* parent = nullptr);
+    explicit KStandardItem(const QString& text, KStandardItem* parent = nullptr);
+    KStandardItem(const QString& icon, const QString& text, KStandardItem* parent = nullptr);
     KStandardItem(const KStandardItem& item);
     virtual ~KStandardItem();
 
diff --git a/src/kitemviews/kstandarditemlistgroupheader.h b/src/kitemviews/kstandarditemlistgroupheader.h
index 1d9989cdf6..36ab777221 100644
--- a/src/kitemviews/kstandarditemlistgroupheader.h
+++ b/src/kitemviews/kstandarditemlistgroupheader.h
@@ -32,10 +32,10 @@ class DOLPHIN_EXPORT KStandardItemListGroupHeader : public KItemListGroupHeader
     Q_OBJECT
 
 public:
-    KStandardItemListGroupHeader(QGraphicsWidget* parent = 0);
+    KStandardItemListGroupHeader(QGraphicsWidget* parent = nullptr);
     ~KStandardItemListGroupHeader() override;
 
-    void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0) override;
+    void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = nullptr) override;
 
 protected:
     void paintRole(QPainter* painter, const QRectF& roleBounds, const QColor& color) override;
diff --git a/src/kitemviews/kstandarditemlistview.h b/src/kitemviews/kstandarditemlistview.h
index d22a51b34b..6321a1d2e6 100644
--- a/src/kitemviews/kstandarditemlistview.h
+++ b/src/kitemviews/kstandarditemlistview.h
@@ -52,7 +52,7 @@ public:
         DetailsLayout
     };
 
-    KStandardItemListView(QGraphicsWidget* parent = 0);
+    KStandardItemListView(QGraphicsWidget* parent = nullptr);
     ~KStandardItemListView() override;
 
     void setItemLayout(ItemLayout layout);
diff --git a/src/kitemviews/kstandarditemlistwidget.cpp b/src/kitemviews/kstandarditemlistwidget.cpp
index 7d94a59f51..d9e175987a 100644
--- a/src/kitemviews/kstandarditemlistwidget.cpp
+++ b/src/kitemviews/kstandarditemlistwidget.cpp
@@ -273,8 +273,8 @@ KStandardItemListWidget::KStandardItemListWidget(KItemListWidgetInformant* infor
     m_additionalInfoTextColor(),
     m_overlay(),
     m_rating(),
-    m_roleEditor(0),
-    m_oldRoleEditor(0)
+    m_roleEditor(nullptr),
+    m_oldRoleEditor(nullptr)
 {
 }
 
@@ -770,7 +770,7 @@ void KStandardItemListWidget::editedRoleChanged(const QByteArray& current, const
             }
             m_oldRoleEditor = m_roleEditor;
             m_roleEditor->hide();
-            m_roleEditor = 0;
+            m_roleEditor = nullptr;
         }
         return;
     }
@@ -1452,7 +1452,7 @@ void KStandardItemListWidget::closeRoleEditor()
     }
     m_oldRoleEditor = m_roleEditor;
     m_roleEditor->hide();
-    m_roleEditor = 0;
+    m_roleEditor = nullptr;
 }
 
 QPixmap KStandardItemListWidget::pixmapForIcon(const QString& name, const QStringList& overlays, int size, QIcon::Mode mode)
diff --git a/src/kitemviews/kstandarditemlistwidget.h b/src/kitemviews/kstandarditemlistwidget.h
index bd4b529231..b13c303bc1 100644
--- a/src/kitemviews/kstandarditemlistwidget.h
+++ b/src/kitemviews/kstandarditemlistwidget.h
@@ -104,7 +104,7 @@ public:
     void setSupportsItemExpanding(bool supportsItemExpanding);
     bool supportsItemExpanding() const;
 
-    void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0) override;
+    void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = nullptr) override;
 
     QRectF iconRect() const override;
     QRectF textRect() const override;
@@ -112,7 +112,7 @@ public:
     QRectF selectionRect() const override;
     QRectF expansionToggleRect() const override;
     QRectF selectionToggleRect() const override;
-    QPixmap createDragPixmap(const QStyleOptionGraphicsItem* option, QWidget* widget = 0) override;
+    QPixmap createDragPixmap(const QStyleOptionGraphicsItem* option, QWidget* widget = nullptr) override;
 
     static KItemListWidgetInformant* createInformant();
 
diff --git a/src/kitemviews/kstandarditemmodel.cpp b/src/kitemviews/kstandarditemmodel.cpp
index 25288e50f1..0779614c3e 100644
--- a/src/kitemviews/kstandarditemmodel.cpp
+++ b/src/kitemviews/kstandarditemmodel.cpp
@@ -89,7 +89,7 @@ void KStandardItemModel::changeItem(int index, KStandardItem* item)
 
     m_indexesForItems.remove(oldItem);
     delete oldItem;
-    oldItem = 0;
+    oldItem = nullptr;
 
     m_items[index] = item;
     m_indexesForItems.insert(item, index);
@@ -114,7 +114,7 @@ void KStandardItemModel::removeItem(int index)
         onItemRemoved(index, item);
 
         delete item;
-        item = 0;
+        item = nullptr;
 
         emit itemsRemoved(KItemRangeList() << KItemRange(index, 1));
 
@@ -134,7 +134,7 @@ void KStandardItemModel::clear()
 KStandardItem* KStandardItemModel::item(int index) const
 {
     if (index < 0 || index >= m_items.count()) {
-        return 0;
+        return nullptr;
     }
     return m_items[index];
 }
@@ -178,7 +178,7 @@ bool KStandardItemModel::setData(int index, const QHash<QByteArray, QVariant>& v
 QMimeData* KStandardItemModel::createMimeData(const KItemSet& indexes) const
 {
     Q_UNUSED(indexes);
-    return 0;
+    return nullptr;
 }
 
 int KStandardItemModel::indexForKeyboardSearch(const QString& text, int startFromIndex) const
diff --git a/src/kitemviews/kstandarditemmodel.h b/src/kitemviews/kstandarditemmodel.h
index 6e63daa81a..288b5b84f7 100644
--- a/src/kitemviews/kstandarditemmodel.h
+++ b/src/kitemviews/kstandarditemmodel.h
@@ -40,7 +40,7 @@ class DOLPHIN_EXPORT KStandardItemModel : public KItemModelBase
     Q_OBJECT
 
 public:
-    explicit KStandardItemModel(QObject* parent = 0);
+    explicit KStandardItemModel(QObject* parent = nullptr);
     ~KStandardItemModel() override;
 
     /**
diff --git a/src/kitemviews/private/kdirectorycontentscounter.cpp b/src/kitemviews/private/kdirectorycontentscounter.cpp
index af7312ad27..90716173c5 100644
--- a/src/kitemviews/private/kdirectorycontentscounter.cpp
+++ b/src/kitemviews/private/kdirectorycontentscounter.cpp
@@ -30,9 +30,9 @@ KDirectoryContentsCounter::KDirectoryContentsCounter(KFileItemModel* model, QObj
     QObject(parent),
     m_model(model),
     m_queue(),
-    m_worker(0),
+    m_worker(nullptr),
     m_workerIsBusy(false),
-    m_dirWatcher(0),
+    m_dirWatcher(nullptr),
     m_watchedDirs()
 {
     connect(m_model, &KFileItemModel::itemsRemoved,
@@ -70,7 +70,7 @@ KDirectoryContentsCounter::~KDirectoryContentsCounter()
         m_workerThread->quit();
         m_workerThread->wait();
         delete m_workerThread;
-        m_workerThread = 0;
+        m_workerThread = nullptr;
 
         // The worker thread has finished running now, so it's safe to delete
         // m_worker. deleteLater() would not work at all because the event loop
@@ -180,5 +180,5 @@ void KDirectoryContentsCounter::startWorker(const QString& path)
     }
 }
 
-QThread* KDirectoryContentsCounter::m_workerThread = 0;
+QThread* KDirectoryContentsCounter::m_workerThread = nullptr;
 int KDirectoryContentsCounter::m_workersCount = 0;
diff --git a/src/kitemviews/private/kdirectorycontentscounter.h b/src/kitemviews/private/kdirectorycontentscounter.h
index 13726fae7a..977765ab72 100644
--- a/src/kitemviews/private/kdirectorycontentscounter.h
+++ b/src/kitemviews/private/kdirectorycontentscounter.h
@@ -35,7 +35,7 @@ class KDirectoryContentsCounter : public QObject
     Q_OBJECT
 
 public:
-    explicit KDirectoryContentsCounter(KFileItemModel* model, QObject* parent = 0);
+    explicit KDirectoryContentsCounter(KFileItemModel* model, QObject* parent = nullptr);
     ~KDirectoryContentsCounter() override;
 
     /**
diff --git a/src/kitemviews/private/kdirectorycontentscounterworker.cpp b/src/kitemviews/private/kdirectorycontentscounterworker.cpp
index 47fbb5dd51..79e134724b 100644
--- a/src/kitemviews/private/kdirectorycontentscounterworker.cpp
+++ b/src/kitemviews/private/kdirectorycontentscounterworker.cpp
@@ -59,7 +59,7 @@ int KDirectoryContentsCounterWorker::subItemsCount(const QString& path, Options
     DIR* dir = ::opendir(QFile::encodeName(path));
     if (dir) {  // krazy:exclude=syscalls
         count = 0;
-        struct dirent *dirEntry = 0;
+        struct dirent *dirEntry = nullptr;
         while ((dirEntry = ::readdir(dir))) {
             if (dirEntry->d_name[0] == '.') {
                 if (dirEntry->d_name[1] == '\0' || !countHiddenFiles) {
diff --git a/src/kitemviews/private/kdirectorycontentscounterworker.h b/src/kitemviews/private/kdirectorycontentscounterworker.h
index b2e31ef0f8..2460a0e1ff 100644
--- a/src/kitemviews/private/kdirectorycontentscounterworker.h
+++ b/src/kitemviews/private/kdirectorycontentscounterworker.h
@@ -37,7 +37,7 @@ public:
     };
     Q_DECLARE_FLAGS(Options, Option)
 
-    explicit KDirectoryContentsCounterWorker(QObject* parent = 0);
+    explicit KDirectoryContentsCounterWorker(QObject* parent = nullptr);
 
     /**
      * Counts the items inside the directory \a path using the options
diff --git a/src/kitemviews/private/kfileitemclipboard.cpp b/src/kitemviews/private/kfileitemclipboard.cpp
index d27869dffd..31e6c61986 100644
--- a/src/kitemviews/private/kfileitemclipboard.cpp
+++ b/src/kitemviews/private/kfileitemclipboard.cpp
@@ -74,7 +74,7 @@ void KFileItemClipboard::updateCutItems()
 }
 
 KFileItemClipboard::KFileItemClipboard() :
-    QObject(0),
+    QObject(nullptr),
     m_cutItems()
 {
     updateCutItems();
diff --git a/src/kitemviews/private/kfileitemmodeldirlister.cpp b/src/kitemviews/private/kfileitemmodeldirlister.cpp
index 778625573a..eeeba11b26 100644
--- a/src/kitemviews/private/kfileitemmodeldirlister.cpp
+++ b/src/kitemviews/private/kfileitemmodeldirlister.cpp
@@ -24,7 +24,7 @@
 KFileItemModelDirLister::KFileItemModelDirLister(QObject* parent) :
     KDirLister(parent)
 {
-    setAutoErrorHandlingEnabled(false, 0);
+    setAutoErrorHandlingEnabled(false, nullptr);
 }
 
 KFileItemModelDirLister::~KFileItemModelDirLister()
diff --git a/src/kitemviews/private/kfileitemmodeldirlister.h b/src/kitemviews/private/kfileitemmodeldirlister.h
index ca5f76de6a..c8b670f713 100644
--- a/src/kitemviews/private/kfileitemmodeldirlister.h
+++ b/src/kitemviews/private/kfileitemmodeldirlister.h
@@ -34,7 +34,7 @@ class DOLPHIN_EXPORT KFileItemModelDirLister : public KDirLister
     Q_OBJECT
 
 public:
-    KFileItemModelDirLister(QObject* parent = 0);
+    KFileItemModelDirLister(QObject* parent = nullptr);
     ~KFileItemModelDirLister() override;
 
 signals:
diff --git a/src/kitemviews/private/kfileitemmodelfilter.cpp b/src/kitemviews/private/kfileitemmodelfilter.cpp
index 6c6f94ffab..a388a242c8 100644
--- a/src/kitemviews/private/kfileitemmodelfilter.cpp
+++ b/src/kitemviews/private/kfileitemmodelfilter.cpp
@@ -26,7 +26,7 @@
 
 KFileItemModelFilter::KFileItemModelFilter() :
     m_useRegExp(false),
-    m_regExp(0),
+    m_regExp(nullptr),
     m_lowerCasePattern(),
     m_pattern()
 {
@@ -35,7 +35,7 @@ KFileItemModelFilter::KFileItemModelFilter() :
 KFileItemModelFilter::~KFileItemModelFilter()
 {
     delete m_regExp;
-    m_regExp = 0;
+    m_regExp = nullptr;
 }
 
 void KFileItemModelFilter::setPattern(const QString& filter)
diff --git a/src/kitemviews/private/kitemlistheaderwidget.cpp b/src/kitemviews/private/kitemlistheaderwidget.cpp
index cc11e19da3..4092ec523e 100644
--- a/src/kitemviews/private/kitemlistheaderwidget.cpp
+++ b/src/kitemviews/private/kitemlistheaderwidget.cpp
@@ -30,7 +30,7 @@
 KItemListHeaderWidget::KItemListHeaderWidget(QGraphicsWidget* parent) :
     QGraphicsWidget(parent),
     m_automaticColumnResizing(true),
-    m_model(0),
+    m_model(nullptr),
     m_offset(0),
     m_columns(),
     m_columnWidths(),
diff --git a/src/kitemviews/private/kitemlistheaderwidget.h b/src/kitemviews/private/kitemlistheaderwidget.h
index 8248fb7bb0..6d0974f979 100644
--- a/src/kitemviews/private/kitemlistheaderwidget.h
+++ b/src/kitemviews/private/kitemlistheaderwidget.h
@@ -38,7 +38,7 @@ class DOLPHIN_EXPORT KItemListHeaderWidget : public QGraphicsWidget
     Q_OBJECT
 
 public:
-    KItemListHeaderWidget(QGraphicsWidget* parent = 0);
+    KItemListHeaderWidget(QGraphicsWidget* parent = nullptr);
     ~KItemListHeaderWidget() override;
 
     void setModel(KItemModelBase* model);
@@ -64,7 +64,7 @@ public:
 
     qreal minimumColumnWidth() const;
 
-    void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0) override;
+    void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = nullptr) override;
 
 signals:
     /**
@@ -121,7 +121,7 @@ private:
                    const QByteArray& role,
                    const QRectF& rect,
                    int orderIndex,
-                   QWidget* widget = 0) const;
+                   QWidget* widget = nullptr) const;
 
     void updatePressedRoleIndex(const QPointF& pos);
     void updateHoveredRoleIndex(const QPointF& pos);
diff --git a/src/kitemviews/private/kitemlistkeyboardsearchmanager.h b/src/kitemviews/private/kitemlistkeyboardsearchmanager.h
index be1d96c74d..02dedefca0 100644
--- a/src/kitemviews/private/kitemlistkeyboardsearchmanager.h
+++ b/src/kitemviews/private/kitemlistkeyboardsearchmanager.h
@@ -41,7 +41,7 @@ class DOLPHIN_EXPORT KItemListKeyboardSearchManager : public QObject
 
 public:
 
-    KItemListKeyboardSearchManager(QObject* parent = 0);
+    KItemListKeyboardSearchManager(QObject* parent = nullptr);
     ~KItemListKeyboardSearchManager() override;
 
     /**
diff --git a/src/kitemviews/private/kitemlistrubberband.h b/src/kitemviews/private/kitemlistrubberband.h
index fa7401c9ee..eaef591733 100644
--- a/src/kitemviews/private/kitemlistrubberband.h
+++ b/src/kitemviews/private/kitemlistrubberband.h
@@ -32,7 +32,7 @@ class DOLPHIN_EXPORT KItemListRubberBand : public QObject
     Q_OBJECT
 
 public:
-    explicit KItemListRubberBand(QObject* parent = 0);
+    explicit KItemListRubberBand(QObject* parent = nullptr);
     ~KItemListRubberBand() override;
 
     void setStartPosition(const QPointF& pos);
diff --git a/src/kitemviews/private/kitemlistselectiontoggle.cpp b/src/kitemviews/private/kitemlistselectiontoggle.cpp
index 9031c870f8..25f97ee020 100644
--- a/src/kitemviews/private/kitemlistselectiontoggle.cpp
+++ b/src/kitemviews/private/kitemlistselectiontoggle.cpp
@@ -24,7 +24,7 @@
 
 
 KItemListSelectionToggle::KItemListSelectionToggle(QGraphicsItem* parent) :
-    QGraphicsWidget(parent, 0),
+    QGraphicsWidget(parent, nullptr),
     m_checked(false),
     m_hovered(false)
 {
diff --git a/src/kitemviews/private/kitemlistselectiontoggle.h b/src/kitemviews/private/kitemlistselectiontoggle.h
index 7c283fb54d..a10995372e 100644
--- a/src/kitemviews/private/kitemlistselectiontoggle.h
+++ b/src/kitemviews/private/kitemlistselectiontoggle.h
@@ -42,7 +42,7 @@ public:
 
     void setHovered(bool hovered);
 
-    void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0) override;
+    void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = nullptr) override;
 
 protected:
     void resizeEvent(QGraphicsSceneResizeEvent* event) override;
diff --git a/src/kitemviews/private/kitemlistsmoothscroller.cpp b/src/kitemviews/private/kitemlistsmoothscroller.cpp
index 6bfdba4c9a..17eac3b39a 100644
--- a/src/kitemviews/private/kitemlistsmoothscroller.cpp
+++ b/src/kitemviews/private/kitemlistsmoothscroller.cpp
@@ -32,7 +32,7 @@ KItemListSmoothScroller::KItemListSmoothScroller(QScrollBar* scrollBar,
     m_scrollBarPressed(false),
     m_smoothScrolling(true),
     m_scrollBar(scrollBar),
-    m_animation(0)
+    m_animation(nullptr)
 {
     m_animation = new QPropertyAnimation(this);
     const int duration = m_scrollBar->style()->styleHint(QStyle::SH_Widget_Animate, nullptr, m_scrollBar) ? 100 : 1;
diff --git a/src/kitemviews/private/kitemlistsmoothscroller.h b/src/kitemviews/private/kitemlistsmoothscroller.h
index 6dccde9a20..a5aca82e62 100644
--- a/src/kitemviews/private/kitemlistsmoothscroller.h
+++ b/src/kitemviews/private/kitemlistsmoothscroller.h
@@ -39,7 +39,7 @@ class DOLPHIN_EXPORT KItemListSmoothScroller : public QObject
 
 public:
     explicit KItemListSmoothScroller(QScrollBar* scrollBar,
-                                     QObject* parent = 0);
+                                     QObject* parent = nullptr);
     ~KItemListSmoothScroller() override;
 
     void setScrollBar(QScrollBar* scrollBar);
diff --git a/src/kitemviews/private/kitemlistviewanimation.cpp b/src/kitemviews/private/kitemlistviewanimation.cpp
index 67ad192c6e..89b3452108 100644
--- a/src/kitemviews/private/kitemlistviewanimation.cpp
+++ b/src/kitemviews/private/kitemlistviewanimation.cpp
@@ -116,7 +116,7 @@ void KItemListViewAnimation::start(QGraphicsWidget* widget, AnimationType type,
 {
     stop(widget, type);
 
-    QPropertyAnimation* propertyAnim = 0;
+    QPropertyAnimation* propertyAnim = nullptr;
     const int animationDuration = widget->style()->styleHint(QStyle::SH_Widget_Animate) ? 200 : 1;
 
     switch (type) {
diff --git a/src/kitemviews/private/kitemlistviewanimation.h b/src/kitemviews/private/kitemlistviewanimation.h
index ddcb5e964e..ba3a33dc92 100644
--- a/src/kitemviews/private/kitemlistviewanimation.h
+++ b/src/kitemviews/private/kitemlistviewanimation.h
@@ -48,7 +48,7 @@ public:
         ResizeAnimation
     };
 
-    KItemListViewAnimation(QObject* parent = 0);
+    KItemListViewAnimation(QObject* parent = nullptr);
     ~KItemListViewAnimation() override;
 
     void setScrollOrientation(Qt::Orientation orientation);
diff --git a/src/kitemviews/private/kitemlistviewlayouter.cpp b/src/kitemviews/private/kitemlistviewlayouter.cpp
index d544579085..ca39426446 100644
--- a/src/kitemviews/private/kitemlistviewlayouter.cpp
+++ b/src/kitemviews/private/kitemlistviewlayouter.cpp
@@ -35,7 +35,7 @@ KItemListViewLayouter::KItemListViewLayouter(KItemListSizeHintResolver* sizeHint
     m_itemSize(128, 128),
     m_itemMargin(),
     m_headerHeight(0),
-    m_model(0),
+    m_model(nullptr),
     m_sizeHintResolver(sizeHintResolver),
     m_scrollOffset(0),
     m_maximumScrollOffset(0),
diff --git a/src/kitemviews/private/kitemlistviewlayouter.h b/src/kitemviews/private/kitemlistviewlayouter.h
index 84bbfff585..2116f8405c 100644
--- a/src/kitemviews/private/kitemlistviewlayouter.h
+++ b/src/kitemviews/private/kitemlistviewlayouter.h
@@ -50,7 +50,7 @@ class DOLPHIN_EXPORT KItemListViewLayouter : public QObject
     Q_OBJECT
 
 public:
-    KItemListViewLayouter(KItemListSizeHintResolver* sizeHintResolver, QObject* parent = 0);
+    KItemListViewLayouter(KItemListSizeHintResolver* sizeHintResolver, QObject* parent = nullptr);
     ~KItemListViewLayouter() override;
 
     void setScrollOrientation(Qt::Orientation orientation);
diff --git a/src/panels/information/filemetadataconfigurationdialog.h b/src/panels/information/filemetadataconfigurationdialog.h
index f471d545fa..8ca9ef6feb 100644
--- a/src/panels/information/filemetadataconfigurationdialog.h
+++ b/src/panels/information/filemetadataconfigurationdialog.h
@@ -43,7 +43,7 @@ class FileMetaDataConfigurationDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit FileMetaDataConfigurationDialog(QWidget* parent = 0);
+    explicit FileMetaDataConfigurationDialog(QWidget* parent = nullptr);
     ~FileMetaDataConfigurationDialog() override;
 
     /**
diff --git a/src/panels/information/informationpanel.cpp b/src/panels/information/informationpanel.cpp
index 850d94d922..ac987c9b44 100644
--- a/src/panels/information/informationpanel.cpp
+++ b/src/panels/information/informationpanel.cpp
@@ -198,7 +198,7 @@ void InformationPanel::showItemInfo()
 
 void InformationPanel::slotFolderStatFinished(KJob* job)
 {
-    m_folderStatJob = 0;
+    m_folderStatJob = nullptr;
     const KIO::UDSEntry entry = static_cast<KIO::StatJob*>(job)->statResult();
     m_content->showItem(KFileItem(entry, m_shownUrl));
 }
@@ -296,7 +296,7 @@ void InformationPanel::slotLeftDirectory(const QString& directory)
 void InformationPanel::cancelRequest()
 {
     delete m_folderStatJob;
-    m_folderStatJob = 0;
+    m_folderStatJob = nullptr;
 
     m_infoTimer->stop();
     m_resetUrlTimer->stop();
diff --git a/src/panels/information/informationpanelcontent.cpp b/src/panels/information/informationpanelcontent.cpp
index fa4868e52b..c1f5473806 100644
--- a/src/panels/information/informationpanelcontent.cpp
+++ b/src/panels/information/informationpanelcontent.cpp
@@ -65,14 +65,14 @@
 InformationPanelContent::InformationPanelContent(QWidget* parent) :
     QWidget(parent),
     m_item(),
-    m_previewJob(0),
-    m_outdatedPreviewTimer(0),
-    m_preview(0),
-    m_phononWidget(0),
-    m_nameLabel(0),
-    m_metaDataWidget(0),
-    m_metaDataArea(0),
-    m_placesItemModel(0)
+    m_previewJob(nullptr),
+    m_outdatedPreviewTimer(nullptr),
+    m_preview(nullptr),
+    m_phononWidget(nullptr),
+    m_nameLabel(nullptr),
+    m_metaDataWidget(nullptr),
+    m_metaDataArea(nullptr),
+    m_placesItemModel(nullptr)
 {
     parent->installEventFilter(this);
 
diff --git a/src/panels/information/informationpanelcontent.h b/src/panels/information/informationpanelcontent.h
index 925e89a2b4..8b143af1d6 100644
--- a/src/panels/information/informationpanelcontent.h
+++ b/src/panels/information/informationpanelcontent.h
@@ -57,7 +57,7 @@ class InformationPanelContent : public QWidget
     Q_OBJECT
 
 public:
-    explicit InformationPanelContent(QWidget* parent = 0);
+    explicit InformationPanelContent(QWidget* parent = nullptr);
     ~InformationPanelContent() override;
 
     /**
diff --git a/src/panels/information/phononwidget.h b/src/panels/information/phononwidget.h
index 9402391447..947f0cdac2 100644
--- a/src/panels/information/phononwidget.h
+++ b/src/panels/information/phononwidget.h
@@ -43,7 +43,7 @@ class PhononWidget : public QWidget
 {
     Q_OBJECT
     public:
-        PhononWidget(QWidget *parent = 0);
+        PhononWidget(QWidget *parent = nullptr);
 
         void setUrl(const QUrl &url);
         QUrl url() const;
diff --git a/src/panels/panel.h b/src/panels/panel.h
index f706c3b827..84d73e74c0 100644
--- a/src/panels/panel.h
+++ b/src/panels/panel.h
@@ -35,7 +35,7 @@ class Panel : public QWidget
     Q_OBJECT
 
 public:
-    explicit Panel(QWidget* parent = 0);
+    explicit Panel(QWidget* parent = nullptr);
     ~Panel() override;
 
     /** Returns the current set URL of the active Dolphin view. */
diff --git a/src/panels/places/placesitem.cpp b/src/panels/places/placesitem.cpp
index 93cc4d5c3d..297cf95d6a 100644
--- a/src/panels/places/placesitem.cpp
+++ b/src/panels/places/placesitem.cpp
@@ -66,7 +66,7 @@ void PlacesItem::setUrl(const QUrl &url)
             // watches for changes if the number of items has been changed.
             // The update of the icon is handled in onTrashDirListerCompleted().
             m_trashDirLister = new KDirLister();
-            m_trashDirLister->setAutoErrorHandlingEnabled(false, 0);
+            m_trashDirLister->setAutoErrorHandlingEnabled(false, nullptr);
             m_trashDirLister->setDelayedMimeTypes(true);
             QObject::connect(m_trashDirLister.data(), static_cast<void(KDirLister::*)()>(&KDirLister::completed),
                              m_signalHandler.data(), &PlacesItemSignalHandler::onTrashDirListerCompleted);
diff --git a/src/panels/places/placesitem.h b/src/panels/places/placesitem.h
index 7d1ab610a9..b7cd8e79f5 100644
--- a/src/panels/places/placesitem.h
+++ b/src/panels/places/placesitem.h
@@ -48,7 +48,7 @@ public:
         DevicesType
     };
 
-    explicit PlacesItem(const KBookmark& bookmark, PlacesItem* parent = 0);
+    explicit PlacesItem(const KBookmark& bookmark, PlacesItem* parent = nullptr);
     ~PlacesItem() override;
 
     void setUrl(const QUrl& url);
diff --git a/src/panels/places/placesitemeditdialog.cpp b/src/panels/places/placesitemeditdialog.cpp
index ffcac4c8f7..4a56ce9085 100644
--- a/src/panels/places/placesitemeditdialog.cpp
+++ b/src/panels/places/placesitemeditdialog.cpp
@@ -44,10 +44,10 @@ PlacesItemEditDialog::PlacesItemEditDialog(QWidget* parent) :
     m_text(),
     m_url(),
     m_allowGlobal(false),
-    m_urlEdit(0),
-    m_textEdit(0),
-    m_iconButton(0),
-    m_appLocal(0),
+    m_urlEdit(nullptr),
+    m_textEdit(nullptr),
+    m_iconButton(nullptr),
+    m_appLocal(nullptr),
     m_buttonBox(nullptr)
 {
 }
diff --git a/src/panels/places/placesitemeditdialog.h b/src/panels/places/placesitemeditdialog.h
index 5f61eede26..73104a1b6c 100644
--- a/src/panels/places/placesitemeditdialog.h
+++ b/src/panels/places/placesitemeditdialog.h
@@ -38,7 +38,7 @@ class PlacesItemEditDialog: public QDialog
     Q_OBJECT
 
 public:
-    explicit PlacesItemEditDialog(QWidget* parent = 0);
+    explicit PlacesItemEditDialog(QWidget* parent = nullptr);
     ~PlacesItemEditDialog() override;
 
     void setIcon(const QString& icon);
diff --git a/src/panels/places/placesitemlistgroupheader.h b/src/panels/places/placesitemlistgroupheader.h
index f3cdaa6a6b..4408aa9ef8 100644
--- a/src/panels/places/placesitemlistgroupheader.h
+++ b/src/panels/places/placesitemlistgroupheader.h
@@ -27,7 +27,7 @@ class PlacesItemListGroupHeader : public KStandardItemListGroupHeader
     Q_OBJECT
 
 public:
-    PlacesItemListGroupHeader(QGraphicsWidget* parent = 0);
+    PlacesItemListGroupHeader(QGraphicsWidget* parent = nullptr);
     ~PlacesItemListGroupHeader() override;
 
 protected:
diff --git a/src/panels/places/placesitemmodel.cpp b/src/panels/places/placesitemmodel.cpp
index 680d513b5c..371bcb892b 100644
--- a/src/panels/places/placesitemmodel.cpp
+++ b/src/panels/places/placesitemmodel.cpp
@@ -73,13 +73,13 @@ PlacesItemModel::PlacesItemModel(QObject* parent) :
     m_hiddenItemsShown(false),
     m_availableDevices(),
     m_predicate(),
-    m_bookmarkManager(0),
+    m_bookmarkManager(nullptr),
     m_systemBookmarks(),
     m_systemBookmarksIndexes(),
     m_bookmarkedItems(),
     m_hiddenItemToRemove(-1),
-    m_deviceToTearDown(0),
-    m_updateBookmarksTimer(0),
+    m_deviceToTearDown(nullptr),
+    m_updateBookmarksTimer(nullptr),
     m_storageSetupInProgress()
 {
 #ifdef HAVE_BALOO
@@ -250,24 +250,24 @@ QAction* PlacesItemModel::ejectAction(int index) const
 {
     const PlacesItem* item = placesItem(index);
     if (item && item->device().is<Solid::OpticalDisc>()) {
-        return new QAction(QIcon::fromTheme(QStringLiteral("media-eject")), i18nc("@item", "Eject"), 0);
+        return new QAction(QIcon::fromTheme(QStringLiteral("media-eject")), i18nc("@item", "Eject"), nullptr);
     }
 
-    return 0;
+    return nullptr;
 }
 
 QAction* PlacesItemModel::teardownAction(int index) const
 {
     const PlacesItem* item = placesItem(index);
     if (!item) {
-        return 0;
+        return nullptr;
     }
 
     Solid::Device device = item->device();
     const bool providesTearDown = device.is<Solid::StorageAccess>() &&
                                   device.as<Solid::StorageAccess>()->isAccessible();
     if (!providesTearDown) {
-        return 0;
+        return nullptr;
     }
 
     Solid::StorageDrive* drive = device.as<Solid::StorageDrive>();
@@ -295,10 +295,10 @@ QAction* PlacesItemModel::teardownAction(int index) const
     }
 
     if (iconName.isEmpty()) {
-        return new QAction(text, 0);
+        return new QAction(text, nullptr);
     }
 
-    return new QAction(QIcon::fromTheme(iconName), text, 0);
+    return new QAction(QIcon::fromTheme(iconName), text, nullptr);
 }
 
 void PlacesItemModel::requestEject(int index)
@@ -687,7 +687,7 @@ void PlacesItemModel::updateBookmarks()
     int modelIndex = 0;
     for (int i = m_bookmarkedItems.count() - 1; i >= 0; --i) {
         PlacesItem* item = m_bookmarkedItems[i];
-        const bool itemIsPartOfModel = (item == 0);
+        const bool itemIsPartOfModel = (item == nullptr);
         if (itemIsPartOfModel) {
             item = placesItem(modelIndex);
         }
diff --git a/src/panels/places/placesitemmodel.h b/src/panels/places/placesitemmodel.h
index 9c91f7b082..3b9307fe6d 100644
--- a/src/panels/places/placesitemmodel.h
+++ b/src/panels/places/placesitemmodel.h
@@ -50,7 +50,7 @@ class PlacesItemModel: public KStandardItemModel
     Q_OBJECT
 
 public:
-    explicit PlacesItemModel(QObject* parent = 0);
+    explicit PlacesItemModel(QObject* parent = nullptr);
     ~PlacesItemModel() override;
 
     /**
diff --git a/src/panels/places/placespanel.cpp b/src/panels/places/placespanel.cpp
index 0b76f18d3b..9888290d9f 100644
--- a/src/panels/places/placespanel.cpp
+++ b/src/panels/places/placespanel.cpp
@@ -170,10 +170,10 @@ void PlacesPanel::slotItemContextMenuRequested(int index, const QPointF& pos)
 
     QMenu menu(this);
 
-    QAction* emptyTrashAction = 0;
-    QAction* editAction = 0;
-    QAction* teardownAction = 0;
-    QAction* ejectAction = 0;
+    QAction* emptyTrashAction = nullptr;
+    QAction* editAction = nullptr;
+    QAction* teardownAction = nullptr;
+    QAction* ejectAction = nullptr;
 
     const QString label = item->text();
 
@@ -213,7 +213,7 @@ void PlacesPanel::slotItemContextMenuRequested(int index, const QPointF& pos)
         editAction = menu.addAction(QIcon::fromTheme("document-properties"), i18nc("@item:inmenu", "Edit..."));
     }
 
-    QAction* removeAction = 0;
+    QAction* removeAction = nullptr;
     if (!isDevice && !item->isSystemItem()) {
         removeAction = menu.addAction(QIcon::fromTheme(QStringLiteral("edit-delete")), i18nc("@item:inmenu", "Remove"));
     }
@@ -267,7 +267,7 @@ void PlacesPanel::slotViewContextMenuRequested(const QPointF& pos)
 
     QAction* addAction = menu.addAction(QIcon::fromTheme(QStringLiteral("document-new")), i18nc("@item:inmenu", "Add Entry..."));
 
-    QAction* showAllAction = 0;
+    QAction* showAllAction = nullptr;
     if (m_model->hiddenCount() > 0) {
         showAllAction = menu.addAction(i18nc("@item:inmenu", "Show All Entries"));
         showAllAction->setCheckable(true);
@@ -388,8 +388,8 @@ void PlacesPanel::slotItemDropEventStorageSetupDone(int index, bool success)
         delete m_itemDropEvent;
 
         m_itemDropEventIndex = -1;
-        m_itemDropEventMimeData = 0;
-        m_itemDropEvent = 0;
+        m_itemDropEventMimeData = nullptr;
+        m_itemDropEvent = nullptr;
     }
 }
 
@@ -413,7 +413,7 @@ void PlacesPanel::slotTrashUpdated(KJob* job)
         emit errorMessage(job->errorString());
     }
     // as long as KIO doesn't do this, do it ourselves
-    KNotification::event(QStringLiteral("Trash: emptied"), QString(), QPixmap(), 0, KNotification::DefaultEvent);
+    KNotification::event(QStringLiteral("Trash: emptied"), QString(), QPixmap(), nullptr, KNotification::DefaultEvent);
 }
 
 void PlacesPanel::slotStorageSetupDone(int index, bool success)
diff --git a/src/panels/terminal/terminalpanel.cpp b/src/panels/terminal/terminalpanel.cpp
index b7d3605aa5..c205374cdc 100644
--- a/src/panels/terminal/terminalpanel.cpp
+++ b/src/panels/terminal/terminalpanel.cpp
@@ -38,11 +38,11 @@
 TerminalPanel::TerminalPanel(QWidget* parent) :
     Panel(parent),
     m_clearTerminal(true),
-    m_mostLocalUrlJob(0),
-    m_layout(0),
-    m_terminal(0),
-    m_terminalWidget(0),
-    m_konsolePart(0),
+    m_mostLocalUrlJob(nullptr),
+    m_layout(nullptr),
+    m_terminal(nullptr),
+    m_terminalWidget(nullptr),
+    m_konsolePart(nullptr),
     m_konsolePartCurrentDirectory(),
     m_sendCdToTerminalHistory()
 {
@@ -69,7 +69,7 @@ QString TerminalPanel::currentWorkingDirectory()
 
 void TerminalPanel::terminalExited()
 {
-    m_terminal = 0;
+    m_terminal = nullptr;
     emit hideTerminalPanel();
 }
 
@@ -117,12 +117,12 @@ void TerminalPanel::showEvent(QShowEvent* event)
 
     if (!m_terminal) {
         m_clearTerminal = true;
-        KPluginFactory* factory = 0;
+        KPluginFactory* factory = nullptr;
         KService::Ptr service = KService::serviceByDesktopName(QStringLiteral("konsolepart"));
         if (service) {
             factory = KPluginLoader(service->library()).factory();
         }
-        m_konsolePart = factory ? (factory->create<KParts::ReadOnlyPart>(this)) : 0;
+        m_konsolePart = factory ? (factory->create<KParts::ReadOnlyPart>(this)) : nullptr;
         if (m_konsolePart) {
             connect(m_konsolePart, &KParts::ReadOnlyPart::destroyed, this, &TerminalPanel::terminalExited);
             m_terminalWidget = m_konsolePart->widget();
@@ -144,7 +144,7 @@ void TerminalPanel::showEvent(QShowEvent* event)
 void TerminalPanel::changeDir(const QUrl& url)
 {
     delete m_mostLocalUrlJob;
-    m_mostLocalUrlJob = 0;
+    m_mostLocalUrlJob = nullptr;
 
     if (url.isLocalFile()) {
         sendCdToTerminal(url.toLocalFile());
@@ -198,7 +198,7 @@ void TerminalPanel::slotMostLocalUrlResult(KJob* job)
         sendCdToTerminal(url.toLocalFile());
     }
 
-    m_mostLocalUrlJob = 0;
+    m_mostLocalUrlJob = nullptr;
 }
 
 void TerminalPanel::slotKonsolePartCurrentDirectoryChanged(const QString& dir)
diff --git a/src/search/dolphinsearchbox.cpp b/src/search/dolphinsearchbox.cpp
index 3456920089..60678eb45b 100644
--- a/src/search/dolphinsearchbox.cpp
+++ b/src/search/dolphinsearchbox.cpp
@@ -53,20 +53,20 @@ DolphinSearchBox::DolphinSearchBox(QWidget* parent) :
     QWidget(parent),
     m_startedSearching(false),
     m_active(true),
-    m_topLayout(0),
-    m_searchLabel(0),
-    m_searchInput(0),
-    m_saveSearchAction(0),
-    m_optionsScrollArea(0),
-    m_fileNameButton(0),
-    m_contentButton(0),
-    m_separator(0),
-    m_fromHereButton(0),
-    m_everywhereButton(0),
-    m_facetsToggleButton(0),
-    m_facetsWidget(0),
+    m_topLayout(nullptr),
+    m_searchLabel(nullptr),
+    m_searchInput(nullptr),
+    m_saveSearchAction(nullptr),
+    m_optionsScrollArea(nullptr),
+    m_fileNameButton(nullptr),
+    m_contentButton(nullptr),
+    m_separator(nullptr),
+    m_fromHereButton(nullptr),
+    m_everywhereButton(nullptr),
+    m_facetsToggleButton(nullptr),
+    m_facetsWidget(nullptr),
     m_searchPath(),
-    m_startSearchTimer(0)
+    m_startSearchTimer(nullptr)
 {
 }
 
diff --git a/src/search/dolphinsearchbox.h b/src/search/dolphinsearchbox.h
index 781c592e16..c138cfe7f3 100644
--- a/src/search/dolphinsearchbox.h
+++ b/src/search/dolphinsearchbox.h
@@ -46,7 +46,7 @@ class DolphinSearchBox : public QWidget {
     Q_OBJECT
 
 public:
-    explicit DolphinSearchBox(QWidget* parent = 0);
+    explicit DolphinSearchBox(QWidget* parent = nullptr);
     ~DolphinSearchBox() override;
 
     /**
diff --git a/src/settings/additionalinfodialog.cpp b/src/settings/additionalinfodialog.cpp
index 4589b5d447..3eacd522ff 100644
--- a/src/settings/additionalinfodialog.cpp
+++ b/src/settings/additionalinfodialog.cpp
@@ -41,7 +41,7 @@ AdditionalInfoDialog::AdditionalInfoDialog(QWidget* parent,
                                            const QList<QByteArray>& visibleRoles) :
     QDialog(parent),
     m_visibleRoles(visibleRoles),
-    m_listWidget(0)
+    m_listWidget(nullptr)
 {
     setWindowTitle(i18nc("@title:window", "Additional Information"));
     setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Minimum);
diff --git a/src/settings/applyviewpropsjob.cpp b/src/settings/applyviewpropsjob.cpp
index 5919667599..59f8c8eee6 100644
--- a/src/settings/applyviewpropsjob.cpp
+++ b/src/settings/applyviewpropsjob.cpp
@@ -26,7 +26,7 @@
 ApplyViewPropsJob::ApplyViewPropsJob(const QUrl& dir,
                                      const ViewProperties& viewProps) :
     KIO::Job(),
-    m_viewProps(0),
+    m_viewProps(nullptr),
     m_progress(0),
     m_dir(dir)
 {
@@ -46,7 +46,7 @@ ApplyViewPropsJob::ApplyViewPropsJob(const QUrl& dir,
 ApplyViewPropsJob::~ApplyViewPropsJob()
 {
     delete m_viewProps;  // the properties are written by the destructor
-    m_viewProps = 0;
+    m_viewProps = nullptr;
 }
 
 void ApplyViewPropsJob::slotEntries(KIO::Job*, const KIO::UDSEntryList& list)
diff --git a/src/settings/dolphinsettingsdialog.h b/src/settings/dolphinsettingsdialog.h
index ca35b0aad3..4c8768fde5 100644
--- a/src/settings/dolphinsettingsdialog.h
+++ b/src/settings/dolphinsettingsdialog.h
@@ -36,7 +36,7 @@ class DolphinSettingsDialog : public KPageDialog
     Q_OBJECT
 
 public:
-    explicit DolphinSettingsDialog(const QUrl& url, QWidget* parent = 0);
+    explicit DolphinSettingsDialog(const QUrl& url, QWidget* parent = nullptr);
     ~DolphinSettingsDialog() override;
 
 signals:
diff --git a/src/settings/general/confirmationssettingspage.cpp b/src/settings/general/confirmationssettingspage.cpp
index 2419dc0f43..90dd0ad37a 100644
--- a/src/settings/general/confirmationssettingspage.cpp
+++ b/src/settings/general/confirmationssettingspage.cpp
@@ -35,9 +35,9 @@ namespace {
 
 ConfirmationsSettingsPage::ConfirmationsSettingsPage(QWidget* parent) :
     SettingsPageBase(parent),
-    m_confirmMoveToTrash(0),
-    m_confirmDelete(0),
-    m_confirmClosingMultipleTabs(0)
+    m_confirmMoveToTrash(nullptr),
+    m_confirmDelete(nullptr),
+    m_confirmClosingMultipleTabs(nullptr)
 {
     QVBoxLayout* topLayout = new QVBoxLayout(this);
 
diff --git a/src/settings/general/generalsettingspage.cpp b/src/settings/general/generalsettingspage.cpp
index d8f61ef90b..f9a2c67d0b 100644
--- a/src/settings/general/generalsettingspage.cpp
+++ b/src/settings/general/generalsettingspage.cpp
@@ -65,7 +65,7 @@ GeneralSettingsPage::GeneralSettingsPage(const QUrl& url, QWidget* parent) :
     m_pages.append(confirmationsPage);
     m_pages.append(statusBarPage);
 
-    topLayout->addWidget(tabWidget, 0, 0);
+    topLayout->addWidget(tabWidget, 0, nullptr);
 }
 
 GeneralSettingsPage::~GeneralSettingsPage()
diff --git a/src/settings/general/previewssettingspage.cpp b/src/settings/general/previewssettingspage.cpp
index b88977af51..e579a572d0 100644
--- a/src/settings/general/previewssettingspage.cpp
+++ b/src/settings/general/previewssettingspage.cpp
@@ -52,9 +52,9 @@ namespace {
 PreviewsSettingsPage::PreviewsSettingsPage(QWidget* parent) :
     SettingsPageBase(parent),
     m_initialized(false),
-    m_listView(0),
+    m_listView(nullptr),
     m_enabledPreviewPlugins(),
-    m_remoteFileSizeBox(0)
+    m_remoteFileSizeBox(nullptr)
 {
     QVBoxLayout* topLayout = new QVBoxLayout(this);
 
diff --git a/src/settings/kcm/kcmdolphingeneral.cpp b/src/settings/kcm/kcmdolphingeneral.cpp
index f5ac4cd556..3aedf50750 100644
--- a/src/settings/kcm/kcmdolphingeneral.cpp
+++ b/src/settings/kcm/kcmdolphingeneral.cpp
@@ -65,7 +65,7 @@ DolphinGeneralConfigModule::DolphinGeneralConfigModule(QWidget* parent, const QV
     m_pages.append(previewsPage);
     m_pages.append(confirmationsPage);
 
-    topLayout->addWidget(tabWidget, 0, 0);
+    topLayout->addWidget(tabWidget, 0, nullptr);
 }
 
 DolphinGeneralConfigModule::~DolphinGeneralConfigModule()
diff --git a/src/settings/kcm/kcmdolphinnavigation.cpp b/src/settings/kcm/kcmdolphinnavigation.cpp
index 9ec6ca166a..54cf7ed3c0 100644
--- a/src/settings/kcm/kcmdolphinnavigation.cpp
+++ b/src/settings/kcm/kcmdolphinnavigation.cpp
@@ -30,7 +30,7 @@ K_PLUGIN_FACTORY(KCMDolphinNavigationConfigFactory, registerPlugin<DolphinNaviga
 
 DolphinNavigationConfigModule::DolphinNavigationConfigModule(QWidget* parent, const QVariantList& args) :
     KCModule(parent),
-    m_navigation(0)
+    m_navigation(nullptr)
 {
     Q_UNUSED(args);
 
@@ -41,7 +41,7 @@ DolphinNavigationConfigModule::DolphinNavigationConfigModule(QWidget* parent, co
 
     m_navigation = new NavigationSettingsPage(this);
     connect(m_navigation, &NavigationSettingsPage::changed, this, static_cast<void(DolphinNavigationConfigModule::*)()>(&DolphinNavigationConfigModule::changed));
-    topLayout->addWidget(m_navigation, 0, 0);
+    topLayout->addWidget(m_navigation, 0, nullptr);
 }
 
 DolphinNavigationConfigModule::~DolphinNavigationConfigModule()
diff --git a/src/settings/kcm/kcmdolphinservices.cpp b/src/settings/kcm/kcmdolphinservices.cpp
index 39136724ed..5d011c6273 100644
--- a/src/settings/kcm/kcmdolphinservices.cpp
+++ b/src/settings/kcm/kcmdolphinservices.cpp
@@ -30,7 +30,7 @@ K_PLUGIN_FACTORY(KCMDolphinServicesConfigFactory, registerPlugin<DolphinServices
 
 DolphinServicesConfigModule::DolphinServicesConfigModule(QWidget* parent, const QVariantList& args) :
     KCModule(parent),
-    m_services(0)
+    m_services(nullptr)
 {
     Q_UNUSED(args);
 
@@ -41,7 +41,7 @@ DolphinServicesConfigModule::DolphinServicesConfigModule(QWidget* parent, const
 
     m_services = new ServicesSettingsPage(this);
     connect(m_services, &ServicesSettingsPage::changed, this, static_cast<void(DolphinServicesConfigModule::*)()>(&DolphinServicesConfigModule::changed));
-    topLayout->addWidget(m_services, 0, 0);
+    topLayout->addWidget(m_services, 0, nullptr);
 }
 
 DolphinServicesConfigModule::~DolphinServicesConfigModule()
diff --git a/src/settings/kcm/kcmdolphinviewmodes.cpp b/src/settings/kcm/kcmdolphinviewmodes.cpp
index 710ebc70b6..af9b49026b 100644
--- a/src/settings/kcm/kcmdolphinviewmodes.cpp
+++ b/src/settings/kcm/kcmdolphinviewmodes.cpp
@@ -66,7 +66,7 @@ DolphinViewModesConfigModule::DolphinViewModesConfigModule(QWidget* parent, cons
     m_tabs.append(compactTab);
     m_tabs.append(detailsTab);
 
-    topLayout->addWidget(tabWidget, 0, 0);
+    topLayout->addWidget(tabWidget, 0, nullptr);
 }
 
 DolphinViewModesConfigModule::~DolphinViewModesConfigModule()
diff --git a/src/settings/navigation/navigationsettingspage.cpp b/src/settings/navigation/navigationsettingspage.cpp
index e37a35d8eb..82015480a8 100644
--- a/src/settings/navigation/navigationsettingspage.cpp
+++ b/src/settings/navigation/navigationsettingspage.cpp
@@ -28,8 +28,8 @@
 
 NavigationSettingsPage::NavigationSettingsPage(QWidget* parent) :
     SettingsPageBase(parent),
-    m_openArchivesAsFolder(0),
-    m_autoExpandFolders(0)
+    m_openArchivesAsFolder(nullptr),
+    m_autoExpandFolders(nullptr)
 {
     QVBoxLayout* topLayout = new QVBoxLayout(this);
     QWidget* vBox = new QWidget(this);
diff --git a/src/settings/serviceitemdelegate.h b/src/settings/serviceitemdelegate.h
index 27fb15c203..7b0d216db7 100644
--- a/src/settings/serviceitemdelegate.h
+++ b/src/settings/serviceitemdelegate.h
@@ -33,7 +33,7 @@ class ServiceItemDelegate : public KWidgetItemDelegate
     Q_OBJECT
 
 public:
-    explicit ServiceItemDelegate(QAbstractItemView* itemView, QObject* parent = 0);
+    explicit ServiceItemDelegate(QAbstractItemView* itemView, QObject* parent = nullptr);
     ~ServiceItemDelegate() override;
 
     QSize sizeHint(const QStyleOptionViewItem &option,
diff --git a/src/settings/servicemodel.h b/src/settings/servicemodel.h
index 47fe54d6a5..a08844b822 100644
--- a/src/settings/servicemodel.h
+++ b/src/settings/servicemodel.h
@@ -44,7 +44,7 @@ public:
         ConfigurableRole
     };
 
-    explicit ServiceModel(QObject* parent = 0);
+    explicit ServiceModel(QObject* parent = nullptr);
     ~ServiceModel() override;
 
     bool insertRows(int row, int count, const QModelIndex & parent = QModelIndex()) override;
diff --git a/src/settings/services/servicessettingspage.cpp b/src/settings/services/servicessettingspage.cpp
index 2b9b8f46fb..a0d9effc8d 100644
--- a/src/settings/services/servicessettingspage.cpp
+++ b/src/settings/services/servicessettingspage.cpp
@@ -58,9 +58,9 @@ namespace
 ServicesSettingsPage::ServicesSettingsPage(QWidget* parent) :
     SettingsPageBase(parent),
     m_initialized(false),
-    m_serviceModel(0),
-    m_sortModel(0),
-    m_listView(0),
+    m_serviceModel(nullptr),
+    m_sortModel(nullptr),
+    m_listView(nullptr),
     m_enabledVcsPlugins()
 {
     QVBoxLayout* topLayout = new QVBoxLayout(this);
diff --git a/src/settings/settingspagebase.h b/src/settings/settingspagebase.h
index 5e50a8df0c..2bc1dfaaa8 100644
--- a/src/settings/settingspagebase.h
+++ b/src/settings/settingspagebase.h
@@ -31,7 +31,7 @@ class SettingsPageBase : public QWidget
     Q_OBJECT
 
 public:
-    explicit SettingsPageBase(QWidget* parent = 0);
+    explicit SettingsPageBase(QWidget* parent = nullptr);
     ~SettingsPageBase() override;
 
     /**
diff --git a/src/settings/viewmodes/dolphinfontrequester.cpp b/src/settings/viewmodes/dolphinfontrequester.cpp
index b9c5d97cf8..c185fc55dc 100644
--- a/src/settings/viewmodes/dolphinfontrequester.cpp
+++ b/src/settings/viewmodes/dolphinfontrequester.cpp
@@ -29,8 +29,8 @@
 
 DolphinFontRequester::DolphinFontRequester(QWidget* parent) :
     QWidget(parent),
-    m_modeCombo(0),
-    m_chooseFontButton(0),
+    m_modeCombo(nullptr),
+    m_chooseFontButton(nullptr),
     m_mode(SystemFont),
     m_customFont()
 {
diff --git a/src/settings/viewmodes/viewsettingspage.cpp b/src/settings/viewmodes/viewsettingspage.cpp
index 3ed57715a5..ab87201e29 100644
--- a/src/settings/viewmodes/viewsettingspage.cpp
+++ b/src/settings/viewmodes/viewsettingspage.cpp
@@ -56,7 +56,7 @@ ViewSettingsPage::ViewSettingsPage(QWidget* parent) :
     m_tabs.append(compactTab);
     m_tabs.append(detailsTab);
 
-    topLayout->addWidget(tabWidget, 0, 0);
+    topLayout->addWidget(tabWidget, 0, nullptr);
 }
 
 ViewSettingsPage::~ViewSettingsPage()
diff --git a/src/settings/viewmodes/viewsettingstab.cpp b/src/settings/viewmodes/viewsettingstab.cpp
index a673769ade..bfa3aa16ef 100644
--- a/src/settings/viewmodes/viewsettingstab.cpp
+++ b/src/settings/viewmodes/viewsettingstab.cpp
@@ -40,12 +40,12 @@
 ViewSettingsTab::ViewSettingsTab(Mode mode, QWidget* parent) :
     QWidget(parent),
     m_mode(mode),
-    m_defaultSizeSlider(0),
-    m_previewSizeSlider(0),
-    m_fontRequester(0),
-    m_widthBox(0),
-    m_maxLinesBox(0),
-    m_expandableFolders(0)
+    m_defaultSizeSlider(nullptr),
+    m_previewSizeSlider(nullptr),
+    m_fontRequester(nullptr),
+    m_widthBox(nullptr),
+    m_maxLinesBox(nullptr),
+    m_expandableFolders(nullptr)
 {
     QVBoxLayout* topLayout = new QVBoxLayout(this);
 
@@ -202,7 +202,7 @@ void ViewSettingsTab::applySettings()
 
 void ViewSettingsTab::restoreDefaultSettings()
 {
-    KConfigSkeleton* settings = 0;
+    KConfigSkeleton* settings = nullptr;
     switch (m_mode) {
     case IconsMode:   settings = IconsModeSettings::self(); break;
     case CompactMode: settings = CompactModeSettings::self(); break;
diff --git a/src/settings/viewmodes/viewsettingstab.h b/src/settings/viewmodes/viewsettingstab.h
index 4f4071c1a4..8b1ffc428d 100644
--- a/src/settings/viewmodes/viewsettingstab.h
+++ b/src/settings/viewmodes/viewsettingstab.h
@@ -43,7 +43,7 @@ public:
         DetailsMode
     };
 
-    explicit ViewSettingsTab(Mode mode, QWidget* parent = 0);
+    explicit ViewSettingsTab(Mode mode, QWidget* parent = nullptr);
     ~ViewSettingsTab() override;
 
     void applySettings();
diff --git a/src/settings/viewpropertiesdialog.cpp b/src/settings/viewpropertiesdialog.cpp
index c317ed052e..980ab0bba4 100644
--- a/src/settings/viewpropertiesdialog.cpp
+++ b/src/settings/viewpropertiesdialog.cpp
@@ -52,19 +52,19 @@ ViewPropertiesDialog::ViewPropertiesDialog(DolphinView* dolphinView) :
     QDialog(dolphinView),
     m_isDirty(false),
     m_dolphinView(dolphinView),
-    m_viewProps(0),
-    m_viewMode(0),
-    m_sortOrder(0),
-    m_sorting(0),
-    m_sortFoldersFirst(0),
-    m_previewsShown(0),
-    m_showInGroups(0),
-    m_showHiddenFiles(0),
-    m_additionalInfo(0),
-    m_applyToCurrentFolder(0),
-    m_applyToSubFolders(0),
-    m_applyToAllFolders(0),
-    m_useAsDefault(0)
+    m_viewProps(nullptr),
+    m_viewMode(nullptr),
+    m_sortOrder(nullptr),
+    m_sorting(nullptr),
+    m_sortFoldersFirst(nullptr),
+    m_previewsShown(nullptr),
+    m_showInGroups(nullptr),
+    m_showHiddenFiles(nullptr),
+    m_additionalInfo(nullptr),
+    m_applyToCurrentFolder(nullptr),
+    m_applyToSubFolders(nullptr),
+    m_applyToAllFolders(nullptr),
+    m_useAsDefault(nullptr)
 {
     Q_ASSERT(dolphinView);
     const bool useGlobalViewProps = GeneralSettings::globalViewProps();
@@ -217,7 +217,7 @@ ViewPropertiesDialog::~ViewPropertiesDialog()
 {
     m_isDirty = false;
     delete m_viewProps;
-    m_viewProps = 0;
+    m_viewProps = nullptr;
 
     KConfigGroup dialogConfig(KSharedConfig::openConfig(QStringLiteral("dolphinrc")), "ViewPropertiesDialog");
     KWindowConfig::saveWindowSize(windowHandle(), dialogConfig);
diff --git a/src/settings/viewpropsprogressinfo.cpp b/src/settings/viewpropsprogressinfo.cpp
index 56fee80279..1878c81372 100644
--- a/src/settings/viewpropsprogressinfo.cpp
+++ b/src/settings/viewpropsprogressinfo.cpp
@@ -39,12 +39,12 @@ ViewPropsProgressInfo::ViewPropsProgressInfo(QWidget* parent,
                                              const ViewProperties& viewProps) :
     QDialog(parent),
     m_dir(dir),
-    m_viewProps(0),
-    m_label(0),
-    m_progressBar(0),
-    m_dirSizeJob(0),
-    m_applyViewPropsJob(0),
-    m_timer(0)
+    m_viewProps(nullptr),
+    m_label(nullptr),
+    m_progressBar(nullptr),
+    m_dirSizeJob(nullptr),
+    m_applyViewPropsJob(nullptr),
+    m_timer(nullptr)
 {
     const QSize minSize = minimumSize();
     setMinimumSize(QSize(320, minSize.height()));
@@ -96,13 +96,13 @@ ViewPropsProgressInfo::ViewPropsProgressInfo(QWidget* parent,
 ViewPropsProgressInfo::~ViewPropsProgressInfo()
 {
     delete m_viewProps;
-    m_viewProps = 0;
+    m_viewProps = nullptr;
 }
 
 void ViewPropsProgressInfo::closeEvent(QCloseEvent* event)
 {
     m_timer->stop();
-    m_applyViewPropsJob = 0;
+    m_applyViewPropsJob = nullptr;
     QDialog::closeEvent(event);
 }
 
@@ -110,12 +110,12 @@ void ViewPropsProgressInfo::reject()
 {
     if (m_dirSizeJob) {
         m_dirSizeJob->kill();
-        m_dirSizeJob = 0;
+        m_dirSizeJob = nullptr;
     }
 
     if (m_applyViewPropsJob) {
         m_applyViewPropsJob->kill();
-        m_applyViewPropsJob = 0;
+        m_applyViewPropsJob = nullptr;
     }
 
     QDialog::reject();
@@ -144,7 +144,7 @@ void ViewPropsProgressInfo::applyViewProperties()
     m_label->setText(i18nc("@info:progress", "Folders: %1", subdirs));
     m_progressBar->setMaximum(subdirs);
 
-    m_dirSizeJob = 0;
+    m_dirSizeJob = nullptr;
 
     m_applyViewPropsJob = new ApplyViewPropsJob(m_dir, *m_viewProps);
     connect(m_applyViewPropsJob, &ApplyViewPropsJob::result,
diff --git a/src/statusbar/dolphinstatusbar.cpp b/src/statusbar/dolphinstatusbar.cpp
index 31d4ab81a5..9fc559eb75 100644
--- a/src/statusbar/dolphinstatusbar.cpp
+++ b/src/statusbar/dolphinstatusbar.cpp
@@ -49,14 +49,14 @@ DolphinStatusBar::DolphinStatusBar(QWidget* parent) :
     QWidget(parent),
     m_text(),
     m_defaultText(),
-    m_label(0),
-    m_spaceInfo(0),
-    m_zoomSlider(0),
-    m_progressBar(0),
-    m_stopButton(0),
+    m_label(nullptr),
+    m_spaceInfo(nullptr),
+    m_zoomSlider(nullptr),
+    m_progressBar(nullptr),
+    m_stopButton(nullptr),
     m_progress(100),
-    m_showProgressBarTimer(0),
-    m_resetToDefaultTextTimer(0),
+    m_showProgressBarTimer(nullptr),
+    m_resetToDefaultTextTimer(nullptr),
     m_textTimestamp()
 {
     // Initialize text label
diff --git a/src/statusbar/mountpointobserver.h b/src/statusbar/mountpointobserver.h
index 939e848667..ea24c4eea6 100644
--- a/src/statusbar/mountpointobserver.h
+++ b/src/statusbar/mountpointobserver.h
@@ -53,7 +53,7 @@ class MountPointObserver : public QObject
 {
     Q_OBJECT
 
-    explicit MountPointObserver(const QUrl& url, QObject* parent = 0);
+    explicit MountPointObserver(const QUrl& url, QObject* parent = nullptr);
     ~MountPointObserver() override {}
 
 public:
diff --git a/src/statusbar/mountpointobservercache.cpp b/src/statusbar/mountpointobservercache.cpp
index 48796ac5a0..bcdc0b61cd 100644
--- a/src/statusbar/mountpointobservercache.cpp
+++ b/src/statusbar/mountpointobservercache.cpp
@@ -36,7 +36,7 @@ Q_GLOBAL_STATIC(MountPointObserverCacheSingleton, s_MountPointObserverCache)
 MountPointObserverCache::MountPointObserverCache() :
     m_observerForMountPoint(),
     m_mountPointForObserver(),
-    m_updateTimer(0)
+    m_updateTimer(nullptr)
 {
     m_updateTimer = new QTimer(this);
 }
diff --git a/src/statusbar/spaceinfoobserver.cpp b/src/statusbar/spaceinfoobserver.cpp
index 0fb018727c..8f45c18f84 100644
--- a/src/statusbar/spaceinfoobserver.cpp
+++ b/src/statusbar/spaceinfoobserver.cpp
@@ -25,7 +25,7 @@
 
 SpaceInfoObserver::SpaceInfoObserver(const QUrl& url, QObject* parent) :
     QObject(parent),
-    m_mountPointObserver(0),
+    m_mountPointObserver(nullptr),
     m_dataSize(0),
     m_dataAvailable(0)
 {
@@ -39,7 +39,7 @@ SpaceInfoObserver::~SpaceInfoObserver()
 {
     if (m_mountPointObserver) {
         m_mountPointObserver->deref();
-        m_mountPointObserver = 0;
+        m_mountPointObserver = nullptr;
     }
 }
 
@@ -60,7 +60,7 @@ void SpaceInfoObserver::setUrl(const QUrl& url)
         if (m_mountPointObserver) {
             disconnect(m_mountPointObserver, &MountPointObserver::spaceInfoChanged, this, &SpaceInfoObserver::spaceInfoChanged);
             m_mountPointObserver->deref();
-            m_mountPointObserver = 0;
+            m_mountPointObserver = nullptr;
         }
 
         m_mountPointObserver = newObserver;
diff --git a/src/statusbar/spaceinfoobserver.h b/src/statusbar/spaceinfoobserver.h
index 3f203b47ff..144d11fa7f 100644
--- a/src/statusbar/spaceinfoobserver.h
+++ b/src/statusbar/spaceinfoobserver.h
@@ -32,7 +32,7 @@ class SpaceInfoObserver : public QObject
     Q_OBJECT
 
 public:
-    explicit SpaceInfoObserver(const QUrl& url, QObject* parent = 0);
+    explicit SpaceInfoObserver(const QUrl& url, QObject* parent = nullptr);
     ~SpaceInfoObserver() override;
 
     quint64 size() const;
diff --git a/src/statusbar/statusbarspaceinfo.cpp b/src/statusbar/statusbarspaceinfo.cpp
index f364fcf5bc..6b6a6d6108 100644
--- a/src/statusbar/statusbarspaceinfo.cpp
+++ b/src/statusbar/statusbarspaceinfo.cpp
@@ -31,7 +31,7 @@
 
 StatusBarSpaceInfo::StatusBarSpaceInfo(QWidget* parent) :
     KCapacityBar(KCapacityBar::DrawTextInline, parent),
-    m_observer(0)
+    m_observer(nullptr)
 {
     setCursor(Qt::PointingHandCursor);
 }
diff --git a/src/statusbar/statusbarspaceinfo.h b/src/statusbar/statusbarspaceinfo.h
index e89966a597..87e9f776b4 100644
--- a/src/statusbar/statusbarspaceinfo.h
+++ b/src/statusbar/statusbarspaceinfo.h
@@ -40,7 +40,7 @@ class StatusBarSpaceInfo : public KCapacityBar
     Q_OBJECT
 
 public:
-    explicit StatusBarSpaceInfo(QWidget* parent = 0);
+    explicit StatusBarSpaceInfo(QWidget* parent = nullptr);
     ~StatusBarSpaceInfo() override;
 
     void setUrl(const QUrl& url);
diff --git a/src/tests/kfileitemlistviewtest.cpp b/src/tests/kfileitemlistviewtest.cpp
index cac4f7a587..196018045c 100644
--- a/src/tests/kfileitemlistviewtest.cpp
+++ b/src/tests/kfileitemlistviewtest.cpp
@@ -52,7 +52,7 @@ void KFileItemListViewTest::init()
     m_model->m_dirLister->setAutoUpdate(false);
 
     m_listView = new KFileItemListView();
-    m_listView->onModelChanged(m_model, 0);
+    m_listView->onModelChanged(m_model, nullptr);
 
     m_graphicsView = new QGraphicsView();
     m_graphicsView->show();
@@ -62,16 +62,16 @@ void KFileItemListViewTest::init()
 void KFileItemListViewTest::cleanup()
 {
     delete m_graphicsView;
-    m_graphicsView = 0;
+    m_graphicsView = nullptr;
 
     delete m_listView;
-    m_listView = 0;
+    m_listView = nullptr;
 
     delete m_model;
-    m_model = 0;
+    m_model = nullptr;
 
     delete m_testDir;
-    m_testDir = 0;
+    m_testDir = nullptr;
 }
 
 /**
diff --git a/src/tests/kfileitemmodeltest.cpp b/src/tests/kfileitemmodeltest.cpp
index b8e089530d..471818d98e 100644
--- a/src/tests/kfileitemmodeltest.cpp
+++ b/src/tests/kfileitemmodeltest.cpp
@@ -126,10 +126,10 @@ void KFileItemModelTest::init()
 void KFileItemModelTest::cleanup()
 {
     delete m_model;
-    m_model = 0;
+    m_model = nullptr;
 
     delete m_testDir;
-    m_testDir = 0;
+    m_testDir = nullptr;
 }
 
 void KFileItemModelTest::testDefaultRoles()
diff --git a/src/tests/kitemlistcontrollertest.cpp b/src/tests/kitemlistcontrollertest.cpp
index 10bdb8b242..926a781675 100644
--- a/src/tests/kitemlistcontrollertest.cpp
+++ b/src/tests/kitemlistcontrollertest.cpp
@@ -149,10 +149,10 @@ void KItemListControllerTest::initTestCase()
 void KItemListControllerTest::cleanupTestCase()
 {
     delete m_container;
-    m_container = 0;
+    m_container = nullptr;
 
     delete m_testDir;
-    m_testDir = 0;
+    m_testDir = nullptr;
 }
 
 /** Before each test, the current item, selection, and item size are reset to the defaults. */
diff --git a/src/tests/kitemlistselectionmanagertest.cpp b/src/tests/kitemlistselectionmanagertest.cpp
index 245f23d64e..daa03ae204 100644
--- a/src/tests/kitemlistselectionmanagertest.cpp
+++ b/src/tests/kitemlistselectionmanagertest.cpp
@@ -99,10 +99,10 @@ void KItemListSelectionManagerTest::init()
 void KItemListSelectionManagerTest::cleanup()
 {
     delete m_selectionManager;
-    m_selectionManager = 0;
+    m_selectionManager = nullptr;
 
     delete m_model;
-    m_model = 0;
+    m_model = nullptr;
 }
 
 void KItemListSelectionManagerTest::testConstructor()
diff --git a/src/tests/kstandarditemmodeltest.cpp b/src/tests/kstandarditemmodeltest.cpp
index 889748f35c..daa8f1e56c 100644
--- a/src/tests/kstandarditemmodeltest.cpp
+++ b/src/tests/kstandarditemmodeltest.cpp
@@ -51,7 +51,7 @@ void KStandardItemModelTest::init()
 void KStandardItemModelTest::cleanup()
 {
     delete m_model;
-    m_model = 0;
+    m_model = nullptr;
 }
 
 void KStandardItemModelTest::testNewItems()
diff --git a/src/tests/viewpropertiestest.cpp b/src/tests/viewpropertiestest.cpp
index 114afdc33c..5193bb35a2 100644
--- a/src/tests/viewpropertiestest.cpp
+++ b/src/tests/viewpropertiestest.cpp
@@ -56,7 +56,7 @@ void ViewPropertiesTest::init()
 void ViewPropertiesTest::cleanup()
 {
     delete m_testDir;
-    m_testDir = 0;
+    m_testDir = nullptr;
 
     GeneralSettings::self()->setGlobalViewProps(m_globalViewProps);
     GeneralSettings::self()->save();
diff --git a/src/views/dolphinitemlistview.h b/src/views/dolphinitemlistview.h
index 7b3f1f8d0a..ff14fbe7c4 100644
--- a/src/views/dolphinitemlistview.h
+++ b/src/views/dolphinitemlistview.h
@@ -39,7 +39,7 @@ class DOLPHIN_EXPORT DolphinItemListView : public KFileItemListView
     Q_OBJECT
 
 public:
-    explicit DolphinItemListView(QGraphicsWidget* parent = 0);
+    explicit DolphinItemListView(QGraphicsWidget* parent = nullptr);
     ~DolphinItemListView() override;
 
     void setZoomLevel(int level);
diff --git a/src/views/dolphinnewfilemenuobserver.cpp b/src/views/dolphinnewfilemenuobserver.cpp
index 275e1c4fb0..6379adb314 100644
--- a/src/views/dolphinnewfilemenuobserver.cpp
+++ b/src/views/dolphinnewfilemenuobserver.cpp
@@ -54,7 +54,7 @@ void DolphinNewFileMenuObserver::detach(const DolphinNewFileMenu* menu)
 }
 
 DolphinNewFileMenuObserver::DolphinNewFileMenuObserver() :
-    QObject(0)
+    QObject(nullptr)
 {
 }
 
diff --git a/src/views/dolphinview.cpp b/src/views/dolphinview.cpp
index cd802eec1c..10382c57d7 100644
--- a/src/views/dolphinview.cpp
+++ b/src/views/dolphinview.cpp
@@ -87,19 +87,19 @@ DolphinView::DolphinView(const QUrl& url, QWidget* parent) :
     m_viewPropertiesContext(),
     m_mode(DolphinView::IconsView),
     m_visibleRoles(),
-    m_topLayout(0),
-    m_model(0),
-    m_view(0),
-    m_container(0),
-    m_toolTipManager(0),
-    m_selectionChangedTimer(0),
+    m_topLayout(nullptr),
+    m_model(nullptr),
+    m_view(nullptr),
+    m_container(nullptr),
+    m_toolTipManager(nullptr),
+    m_selectionChangedTimer(nullptr),
     m_currentItemUrl(),
     m_scrollToCurrentItem(false),
     m_restoredContentsPosition(),
     m_selectedUrls(),
     m_clearSelectionBeforeSelectingNewItems(false),
     m_markFirstNewlySelectedItemAsCurrent(false),
-    m_versionControlObserver(0),
+    m_versionControlObserver(nullptr),
     m_twoClicksRenamingTimer(nullptr)
 {
     m_topLayout = new QVBoxLayout(this);
@@ -912,7 +912,7 @@ void DolphinView::slotHeaderContextMenuRequested(const QPointF& pos)
 #endif
 
     QString groupName;
-    QMenu* groupMenu = 0;
+    QMenu* groupMenu = nullptr;
 
     // Add all roles to the menu that can be shown or hidden by the user
     const QList<KFileItemModel::RoleInfo> rolesInfo = KFileItemModel::rolesInformation();
@@ -923,7 +923,7 @@ void DolphinView::slotHeaderContextMenuRequested(const QPointF& pos)
         }
 
         const QString text = m_model->roleDescription(info.role);
-        QAction* action = 0;
+        QAction* action = nullptr;
         if (info.group.isEmpty()) {
             action = menu->addAction(text);
         } else {
@@ -1094,11 +1094,11 @@ void DolphinView::dropUrls(const QUrl &destUrl, QDropEvent *dropEvent, QWidget *
 
 void DolphinView::slotModelChanged(KItemModelBase* current, KItemModelBase* previous)
 {
-    if (previous != 0) {
+    if (previous != nullptr) {
         Q_ASSERT(qobject_cast<KFileItemModel*>(previous));
         KFileItemModel* fileItemModel = static_cast<KFileItemModel*>(previous);
         disconnect(fileItemModel, &KFileItemModel::directoryLoadingCompleted, this, &DolphinView::slotDirectoryLoadingCompleted);
-        m_versionControlObserver->setModel(0);
+        m_versionControlObserver->setModel(nullptr);
     }
 
     if (current) {
diff --git a/src/views/dolphinviewactionhandler.cpp b/src/views/dolphinviewactionhandler.cpp
index 10aae11ce6..9debd51731 100644
--- a/src/views/dolphinviewactionhandler.cpp
+++ b/src/views/dolphinviewactionhandler.cpp
@@ -49,7 +49,7 @@
 DolphinViewActionHandler::DolphinViewActionHandler(KActionCollection* collection, QObject* parent) :
     QObject(parent),
     m_actionCollection(collection),
-    m_currentView(0),
+    m_currentView(nullptr),
     m_sortByActions(),
     m_visibleRoles()
 {
@@ -62,7 +62,7 @@ void DolphinViewActionHandler::setCurrentView(DolphinView* view)
     Q_ASSERT(view);
 
     if (m_currentView) {
-        disconnect(m_currentView, 0, this, 0);
+        disconnect(m_currentView, nullptr, this, nullptr);
     }
 
     m_currentView = view;
@@ -233,8 +233,8 @@ QActionGroup* DolphinViewActionHandler::createFileItemRolesActionGroup(const QSt
     }
 
     QString groupName;
-    KActionMenu* groupMenu = 0;
-    QActionGroup* groupMenuGroup = 0;
+    KActionMenu* groupMenu = nullptr;
+    QActionGroup* groupMenuGroup = nullptr;
 
     bool indexingEnabled = false;
 #ifdef HAVE_BALOO
@@ -249,7 +249,7 @@ QActionGroup* DolphinViewActionHandler::createFileItemRolesActionGroup(const QSt
             continue;
         }
 
-        KToggleAction* action = 0;
+        KToggleAction* action = nullptr;
         const QString name = groupPrefix + info.role;
         if (info.group.isEmpty()) {
             action = m_actionCollection->add<KToggleAction>(name);
@@ -590,7 +590,7 @@ void DolphinViewActionHandler::slotAdjustViewProperties()
 
 void DolphinViewActionHandler::slotProperties()
 {
-    KPropertiesDialog* dialog = 0;
+    KPropertiesDialog* dialog = nullptr;
     const KFileItemList list = m_currentView->selectedItems();
     if (list.isEmpty()) {
         const QUrl url = m_currentView->url();
diff --git a/src/views/draganddrophelper.cpp b/src/views/draganddrophelper.cpp
index 831a9d43e0..e944227df9 100644
--- a/src/views/draganddrophelper.cpp
+++ b/src/views/draganddrophelper.cpp
@@ -60,6 +60,6 @@ KIO::DropJob* DragAndDropHelper::dropUrls(const QUrl& destUrl, QDropEvent* event
         return job;
     }
 
-    return 0;
+    return nullptr;
 }
 
diff --git a/src/views/renamedialog.cpp b/src/views/renamedialog.cpp
index 6309bfbdfe..79421a5efa 100644
--- a/src/views/renamedialog.cpp
+++ b/src/views/renamedialog.cpp
@@ -39,10 +39,10 @@ RenameDialog::RenameDialog(QWidget *parent, const KFileItemList& items) :
     QDialog(parent),
     m_renameOneItem(false),
     m_newName(),
-    m_lineEdit(0),
+    m_lineEdit(nullptr),
     m_items(items),
     m_allExtensionsDifferent(true),
-    m_spinBox(0)
+    m_spinBox(nullptr)
 {
     const QSize minSize = minimumSize();
     setMinimumSize(QSize(320, minSize.height()));
@@ -72,7 +72,7 @@ RenameDialog::RenameDialog(QWidget *parent, const KFileItemList& items) :
 
     QVBoxLayout* topLayout = new QVBoxLayout(page);
 
-    QLabel* editLabel = 0;
+    QLabel* editLabel = nullptr;
     if (m_renameOneItem) {
         m_newName = items.first().name();
         editLabel = new QLabel(xi18nc("@label:textbox", "Rename the item <filename>%1</filename> to:", m_newName),
diff --git a/src/views/tooltips/dolphinfilemetadatawidget.cpp b/src/views/tooltips/dolphinfilemetadatawidget.cpp
index 52eeb3b710..cabfc06176 100644
--- a/src/views/tooltips/dolphinfilemetadatawidget.cpp
+++ b/src/views/tooltips/dolphinfilemetadatawidget.cpp
@@ -41,9 +41,9 @@
 
 DolphinFileMetaDataWidget::DolphinFileMetaDataWidget(QWidget* parent) :
     QWidget(parent),
-    m_preview(0),
-    m_name(0),
-    m_fileMetaDataWidget(0)
+    m_preview(nullptr),
+    m_name(nullptr),
+    m_fileMetaDataWidget(nullptr)
 {
     // Create widget for file preview
     m_preview = new QLabel(this);
diff --git a/src/views/tooltips/dolphinfilemetadatawidget.h b/src/views/tooltips/dolphinfilemetadatawidget.h
index 0b9add581e..6dcc5237c1 100644
--- a/src/views/tooltips/dolphinfilemetadatawidget.h
+++ b/src/views/tooltips/dolphinfilemetadatawidget.h
@@ -45,7 +45,7 @@ class DolphinFileMetaDataWidget : public QWidget
     Q_OBJECT
 
 public:
-    DolphinFileMetaDataWidget(QWidget* parent = 0);
+    DolphinFileMetaDataWidget(QWidget* parent = nullptr);
     ~DolphinFileMetaDataWidget() override;
 
     void setPreview(const QPixmap& pixmap);
diff --git a/src/views/tooltips/tooltipmanager.cpp b/src/views/tooltips/tooltipmanager.cpp
index 9375172eb4..3d3598ff5f 100644
--- a/src/views/tooltips/tooltipmanager.cpp
+++ b/src/views/tooltips/tooltipmanager.cpp
@@ -35,10 +35,10 @@
 
 ToolTipManager::ToolTipManager(QWidget* parent) :
     QObject(parent),
-    m_showToolTipTimer(0),
-    m_contentRetrievalTimer(0),
-    m_transientParent(0),
-    m_fileMetaDataWidget(0),
+    m_showToolTipTimer(nullptr),
+    m_contentRetrievalTimer(nullptr),
+    m_transientParent(nullptr),
+    m_fileMetaDataWidget(nullptr),
     m_toolTipRequested(false),
     m_metaDataRequested(false),
     m_appliedWaitCursor(false),
diff --git a/src/views/versioncontrol/kversioncontrolplugin.h b/src/views/versioncontrol/kversioncontrolplugin.h
index b9b1f0b5b5..a3be381f3f 100644
--- a/src/views/versioncontrol/kversioncontrolplugin.h
+++ b/src/views/versioncontrol/kversioncontrolplugin.h
@@ -144,7 +144,7 @@ public:
         MissingVersion
     };
 
-    KVersionControlPlugin(QObject* parent = 0);
+    KVersionControlPlugin(QObject* parent = nullptr);
     ~KVersionControlPlugin() override;
 
     /**
diff --git a/src/views/versioncontrol/updateitemstatesthread.cpp b/src/views/versioncontrol/updateitemstatesthread.cpp
index e4413fabfb..574402dcde 100644
--- a/src/views/versioncontrol/updateitemstatesthread.cpp
+++ b/src/views/versioncontrol/updateitemstatesthread.cpp
@@ -25,7 +25,7 @@
 UpdateItemStatesThread::UpdateItemStatesThread(KVersionControlPlugin* plugin,
                                                const QMap<QString, QVector<VersionControlObserver::ItemState> >& itemStates) :
     QThread(),
-    m_globalPluginMutex(0),
+    m_globalPluginMutex(nullptr),
     m_plugin(plugin),
     m_itemStates(itemStates)
 {
diff --git a/src/views/versioncontrol/versioncontrolobserver.cpp b/src/views/versioncontrol/versioncontrolobserver.cpp
index c794408825..44dffac45d 100644
--- a/src/views/versioncontrol/versioncontrolobserver.cpp
+++ b/src/views/versioncontrol/versioncontrolobserver.cpp
@@ -37,10 +37,10 @@ VersionControlObserver::VersionControlObserver(QObject* parent) :
     m_pendingItemStatesUpdate(false),
     m_versionedDirectory(false),
     m_silentUpdate(false),
-    m_model(0),
-    m_dirVerificationTimer(0),
-    m_plugin(0),
-    m_updateItemStatesThread(0)
+    m_model(nullptr),
+    m_dirVerificationTimer(nullptr),
+    m_plugin(nullptr),
+    m_updateItemStatesThread(nullptr)
 {
     // The verification timer specifies the timeout until the shown directory
     // is checked whether it is versioned. Per default it is assumed that users
@@ -58,7 +58,7 @@ VersionControlObserver::~VersionControlObserver()
 {
     if (m_plugin) {
         m_plugin->disconnect(this);
-        m_plugin = 0;
+        m_plugin = nullptr;
     }
 }
 
@@ -163,7 +163,7 @@ void VersionControlObserver::verifyDirectory()
 void VersionControlObserver::slotThreadFinished()
 {
     UpdateItemStatesThread* thread = m_updateItemStatesThread;
-    m_updateItemStatesThread = 0; // The thread deletes itself automatically (see updateItemStates())
+    m_updateItemStatesThread = nullptr; // The thread deletes itself automatically (see updateItemStates())
 
     if (!m_plugin || !thread) {
         return;
@@ -266,7 +266,7 @@ KVersionControlPlugin* VersionControlObserver::searchPlugin(const QUrl& director
     if (!pluginsAvailable) {
         // A searching for plugins has already been done, but no
         // plugins are installed
-        return 0;
+        return nullptr;
     }
 
     if (plugins.isEmpty()) {
@@ -285,13 +285,13 @@ KVersionControlPlugin* VersionControlObserver::searchPlugin(const QUrl& director
         }
         if (plugins.isEmpty()) {
             pluginsAvailable = false;
-            return 0;
+            return nullptr;
         }
     }
 
     // We use the number of upUrl() calls to find the best matching plugin
     // for the given directory. The smaller value, the better it is (0 is best).
-    KVersionControlPlugin* bestPlugin = 0;
+    KVersionControlPlugin* bestPlugin = nullptr;
     int bestScore = INT_MAX;
 
     // Verify whether the current directory contains revision information
diff --git a/src/views/versioncontrol/versioncontrolobserver.h b/src/views/versioncontrol/versioncontrolobserver.h
index 0b702f5f1e..2c2fe2940c 100644
--- a/src/views/versioncontrol/versioncontrolobserver.h
+++ b/src/views/versioncontrol/versioncontrolobserver.h
@@ -50,7 +50,7 @@ class DOLPHIN_EXPORT VersionControlObserver : public QObject
     Q_OBJECT
 
 public:
-    explicit VersionControlObserver(QObject* parent = 0);
+    explicit VersionControlObserver(QObject* parent = nullptr);
     ~VersionControlObserver() override;
 
     void setModel(KFileItemModel* model);
diff --git a/src/views/viewmodecontroller.h b/src/views/viewmodecontroller.h
index 015fdec857..6fa43c38b1 100644
--- a/src/views/viewmodecontroller.h
+++ b/src/views/viewmodecontroller.h
@@ -38,7 +38,7 @@ class DOLPHIN_EXPORT ViewModeController : public QObject
     Q_OBJECT
 
 public:
-    explicit ViewModeController(QObject* parent = 0);
+    explicit ViewModeController(QObject* parent = nullptr);
     ~ViewModeController() override;
 
     /**
diff --git a/src/views/viewproperties.cpp b/src/views/viewproperties.cpp
index ca52be8907..e2be188198 100644
--- a/src/views/viewproperties.cpp
+++ b/src/views/viewproperties.cpp
@@ -50,7 +50,7 @@ namespace {
 ViewProperties::ViewProperties(const QUrl& url) :
     m_changedProps(false),
     m_autoSave(true),
-    m_node(0)
+    m_node(nullptr)
 {
     GeneralSettings* settings = GeneralSettings::self();
     const bool useGlobalViewProps = settings->globalViewProps() || url.isEmpty();
@@ -140,7 +140,7 @@ ViewProperties::~ViewProperties()
     }
 
     delete m_node;
-    m_node = 0;
+    m_node = nullptr;
 }
 
 void ViewProperties::setViewMode(DolphinView::Mode mode)