Help: Use nullptr and fix a few warnings

Change-Id: I7f7307a765d8755bf96b0cad1210e61df0a0199f
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

29 files changed, 70 insertions, 77 deletions

diff --git a/src/plugins/help/centralwidget.cpp b/src/plugins/help/centralwidget.cpp
index cabc2d5ad2..26e65d16e5 100644
--- a/src/plugins/help/centralwidget.cpp
+++ b/src/plugins/help/centralwidget.cpp
@@ -32,7 +32,7 @@
 
 using namespace Help::Internal;
 
-static CentralWidget *gStaticCentralWidget = 0;
+static CentralWidget *gStaticCentralWidget = nullptr;
 
 // -- CentralWidget
 
diff --git a/src/plugins/help/centralwidget.h b/src/plugins/help/centralwidget.h
index 1796088fa9..47343f8c31 100644
--- a/src/plugins/help/centralwidget.h
+++ b/src/plugins/help/centralwidget.h
@@ -38,7 +38,7 @@ class CentralWidget : public HelpWidget
     Q_OBJECT
 
 public:
-    CentralWidget(const Core::Context &context, QWidget *parent = 0);
+    CentralWidget(const Core::Context &context, QWidget *parent = nullptr);
     ~CentralWidget();
 
     static CentralWidget *instance();
diff --git a/src/plugins/help/filtersettingspage.cpp b/src/plugins/help/filtersettingspage.cpp
index ba0ba5c9a6..bf9814e45d 100644
--- a/src/plugins/help/filtersettingspage.cpp
+++ b/src/plugins/help/filtersettingspage.cpp
@@ -104,7 +104,7 @@ void FilterSettingsPage::updateFilterPage()
     foreach (const QString &attribute, attributes)
         new QTreeWidgetItem(m_ui.attributeWidget, QStringList(attribute));
 
-    if (!m_filterMap.keys().isEmpty()) {
+    if (!m_filterMap.isEmpty()) {
         m_ui.filterWidget->setCurrentRow(0);
         updateAttributes(m_ui.filterWidget->currentItem());
     }
@@ -228,7 +228,7 @@ void FilterSettingsPage::finish()
 
 QString FilterSettingsPage::msgFilterLabel(const QString &filter) const
 {
-    if (m_filterMap.keys().isEmpty())
+    if (m_filterMap.isEmpty())
         return tr("No user defined filters available or no filter selected.");
 
     const QStringList &checkedList = m_filterMap.value(filter);
diff --git a/src/plugins/help/generalsettingspage.cpp b/src/plugins/help/generalsettingspage.cpp
index 9c5c7458cb..1ede072893 100644
--- a/src/plugins/help/generalsettingspage.cpp
+++ b/src/plugins/help/generalsettingspage.cpp
@@ -50,7 +50,6 @@ using namespace Core;
 using namespace Help::Internal;
 
 GeneralSettingsPage::GeneralSettingsPage()
-    : m_ui(0)
 {
     setId("A.General settings");
     setDisplayName(tr("General"));
@@ -145,13 +144,13 @@ void GeneralSettingsPage::apply()
     const int startOption = m_ui->helpStartComboBox->currentIndex();
     if (m_startOption != startOption) {
         m_startOption = startOption;
-        LocalHelpManager::setStartOption((LocalHelpManager::StartOption)m_startOption);
+        LocalHelpManager::setStartOption(LocalHelpManager::StartOption(m_startOption));
     }
 
     const int helpOption = m_ui->contextHelpComboBox->currentIndex();
     if (m_contextOption != helpOption) {
         m_contextOption = helpOption;
-        LocalHelpManager::setContextHelpOption((HelpManager::HelpViewerLocation)m_contextOption);
+        LocalHelpManager::setContextHelpOption(HelpManager::HelpViewerLocation(m_contextOption));
     }
 
     const bool close = m_ui->m_returnOnClose->isChecked();
@@ -327,5 +326,5 @@ void GeneralSettingsPage::finish()
     if (!m_ui) // page was never shown
         return;
     delete m_ui;
-    m_ui = 0;
+    m_ui = nullptr;
 }
diff --git a/src/plugins/help/generalsettingspage.h b/src/plugins/help/generalsettingspage.h
index 7b5fe53146..c77378fbf8 100644
--- a/src/plugins/help/generalsettingspage.h
+++ b/src/plugins/help/generalsettingspage.h
@@ -71,7 +71,7 @@ private:
     bool m_returnOnClose;
 
     QPointer<QWidget> m_widget;
-    Ui::GeneralSettingsPage *m_ui;
+    Ui::GeneralSettingsPage *m_ui = nullptr;
 };
 
     }   // Internal
diff --git a/src/plugins/help/helpindexfilter.h b/src/plugins/help/helpindexfilter.h
index c74646d91e..78ad22f27f 100644
--- a/src/plugins/help/helpindexfilter.h
+++ b/src/plugins/help/helpindexfilter.h
@@ -39,7 +39,7 @@ class HelpIndexFilter : public Core::ILocatorFilter
 
 public:
     HelpIndexFilter();
-    ~HelpIndexFilter();
+    ~HelpIndexFilter() final;
 
     // ILocatorFilter
     void prepareSearch(const QString &entry) override;
diff --git a/src/plugins/help/helpmode.h b/src/plugins/help/helpmode.h
index cc3c93222d..7fe08463aa 100644
--- a/src/plugins/help/helpmode.h
+++ b/src/plugins/help/helpmode.h
@@ -36,7 +36,7 @@ namespace Internal {
 class HelpMode : public Core::IMode
 {
 public:
-    explicit HelpMode(QObject *parent = 0);
+    explicit HelpMode(QObject *parent = nullptr);
 };
 
 } // namespace Internal
diff --git a/src/plugins/help/helpplugin.cpp b/src/plugins/help/helpplugin.cpp
index 091a845686..7afa1ca1e8 100644
--- a/src/plugins/help/helpplugin.cpp
+++ b/src/plugins/help/helpplugin.cpp
@@ -740,7 +740,7 @@ void HelpPluginPrivate::handleHelpRequest(const QUrl &url, HelpManager::HelpView
 class DialogClosingOnEscape : public QDialog
 {
 public:
-    DialogClosingOnEscape(QWidget *parent = 0) : QDialog(parent) {}
+    DialogClosingOnEscape(QWidget *parent = nullptr) : QDialog(parent) {}
     bool event(QEvent *event)
     {
         if (event->type() == QEvent::ShortcutOverride) {
diff --git a/src/plugins/help/helpviewer.cpp b/src/plugins/help/helpviewer.cpp
index 7a553000b2..e2cac11fc9 100644
--- a/src/plugins/help/helpviewer.cpp
+++ b/src/plugins/help/helpviewer.cpp
@@ -46,7 +46,9 @@ using namespace Help::Internal;
 struct ExtensionMap {
     const char *extension;
     const char *mimeType;
-} extensionMap[] = {
+};
+
+static ExtensionMap extensionMap[] = {
     {".bmp", "image/bmp"},
     {".css", "text/css"},
     {".gif", "image/gif"},
@@ -76,8 +78,8 @@ struct ExtensionMap {
     {".xhtml", "application/xhtml+xml"},
     {".wml", "text/vnd.wap.wml"},
     {".wmlc", "application/vnd.wap.wmlc"},
-    {"about:blank", 0},
-    {0, 0}
+    {"about:blank", nullptr},
+    {nullptr, nullptr}
 };
 
 HelpViewer::HelpViewer(QWidget *parent)
diff --git a/src/plugins/help/helpviewer.h b/src/plugins/help/helpviewer.h
index c98e8dbbfb..28a2312e46 100644
--- a/src/plugins/help/helpviewer.h
+++ b/src/plugins/help/helpviewer.h
@@ -48,7 +48,7 @@ public:
     };
     Q_DECLARE_FLAGS(Actions, Action)
 
-    explicit HelpViewer(QWidget *parent = 0);
+    explicit HelpViewer(QWidget *parent = nullptr);
     ~HelpViewer();
 
     virtual QFont viewerFont() const = 0;
@@ -75,7 +75,7 @@ public:
     bool isActionVisible(Action action);
 
     virtual bool findText(const QString &text, Core::FindFlags flags,
-        bool incremental, bool fromSearch, bool *wrapped = 0) = 0;
+        bool incremental, bool fromSearch, bool *wrapped = nullptr) = 0;
 
     bool handleForwardBackwardMouseButtons(QMouseEvent *e);
 
diff --git a/src/plugins/help/helpwidget.cpp b/src/plugins/help/helpwidget.cpp
index 8a0c4f943f..0e092e0d72 100644
--- a/src/plugins/help/helpwidget.cpp
+++ b/src/plugins/help/helpwidget.cpp
@@ -696,7 +696,7 @@ void HelpWidget::highlightSearchTerms()
     HelpViewer *viewer = qobject_cast<HelpViewer *>(sender());
     QTC_ASSERT(viewer, return);
     foreach (const QString& term, m_searchTerms)
-        viewer->findText(term, 0, false, true);
+        viewer->findText(term, nullptr, false, true);
     m_searchTerms.clear();
 }
 
diff --git a/src/plugins/help/helpwidget.h b/src/plugins/help/helpwidget.h
index cd1fffa424..7afd555f96 100644
--- a/src/plugins/help/helpwidget.h
+++ b/src/plugins/help/helpwidget.h
@@ -58,7 +58,7 @@ public:
         ExternalWindow
     };
 
-    HelpWidget(const Core::Context &context, WidgetStyle style, QWidget *parent = 0);
+    HelpWidget(const Core::Context &context, WidgetStyle style, QWidget *parent = nullptr);
     ~HelpWidget();
 
     HelpViewer *currentViewer() const;
diff --git a/src/plugins/help/localhelpmanager.cpp b/src/plugins/help/localhelpmanager.cpp
index daeaf5eb56..5142a72877 100644
--- a/src/plugins/help/localhelpmanager.cpp
+++ b/src/plugins/help/localhelpmanager.cpp
@@ -42,18 +42,18 @@
 
 using namespace Help::Internal;
 
-static LocalHelpManager *m_instance = 0;
+static LocalHelpManager *m_instance = nullptr;
 
 bool LocalHelpManager::m_guiNeedsSetup = true;
 bool LocalHelpManager::m_needsCollectionFile = true;
 
 QMutex LocalHelpManager::m_guiMutex;
-QHelpEngine* LocalHelpManager::m_guiEngine = 0;
+QHelpEngine* LocalHelpManager::m_guiEngine = nullptr;
 
 QMutex LocalHelpManager::m_bkmarkMutex;
-BookmarkManager* LocalHelpManager::m_bookmarkManager = 0;
+BookmarkManager* LocalHelpManager::m_bookmarkManager = nullptr;
 
-QStandardItemModel *LocalHelpManager::m_filterModel = 0;
+QStandardItemModel *LocalHelpManager::m_filterModel = nullptr;
 QString LocalHelpManager::m_currentFilter = QString();
 int LocalHelpManager::m_currentFilterIndex = -1;
 
@@ -115,11 +115,11 @@ LocalHelpManager::~LocalHelpManager()
     if (m_bookmarkManager) {
         m_bookmarkManager->saveBookmarks();
         delete m_bookmarkManager;
-        m_bookmarkManager = 0;
+        m_bookmarkManager = nullptr;
     }
 
     delete m_guiEngine;
-    m_guiEngine = 0;
+    m_guiEngine = nullptr;
 }
 
 LocalHelpManager *LocalHelpManager::instance()
diff --git a/src/plugins/help/localhelpmanager.h b/src/plugins/help/localhelpmanager.h
index 39ace0168b..4846c74231 100644
--- a/src/plugins/help/localhelpmanager.h
+++ b/src/plugins/help/localhelpmanager.h
@@ -57,7 +57,7 @@ public:
         ShowLastPages = 2,
     };
 
-    LocalHelpManager(QObject *parent = 0);
+    LocalHelpManager(QObject *parent = nullptr);
     ~LocalHelpManager();
 
     static LocalHelpManager *instance();
diff --git a/src/plugins/help/macwebkithelpviewer.h b/src/plugins/help/macwebkithelpviewer.h
index 643a468880..d98bc4ddfb 100644
--- a/src/plugins/help/macwebkithelpviewer.h
+++ b/src/plugins/help/macwebkithelpviewer.h
@@ -67,7 +67,7 @@ class MacWebKitHelpViewer : public HelpViewer
     Q_OBJECT
 
 public:
-    explicit MacWebKitHelpViewer(QWidget *parent = 0);
+    explicit MacWebKitHelpViewer(QWidget *parent = nullptr);
     ~MacWebKitHelpViewer();
 
     QFont viewerFont() const;
@@ -93,7 +93,7 @@ public:
     void setActionVisible(bool visible);
 
     bool findText(const QString &text, Core::FindFlags flags,
-        bool incremental, bool fromSearch, bool *wrapped = 0);
+        bool incremental, bool fromSearch, bool *wrapped = nullptr);
 
     MacWebKitHelpWidget *widget() const { return m_widget; }
 
diff --git a/src/plugins/help/macwebkithelpviewer.mm b/src/plugins/help/macwebkithelpviewer.mm
index 49744104e4..1a7d561aee 100644
--- a/src/plugins/help/macwebkithelpviewer.mm
+++ b/src/plugins/help/macwebkithelpviewer.mm
@@ -427,7 +427,7 @@ public:
 // #pragma mark -- MacWebKitHelpWidget
 
 MacWebKitHelpWidget::MacWebKitHelpWidget(MacWebKitHelpViewer *parent)
-    : QMacCocoaViewContainer(0, parent),
+    : QMacCocoaViewContainer(nullptr, parent),
       d(new MacWebKitHelpWidgetPrivate(parent))
 {
     d->m_toolTipTimer.setSingleShot(true);
@@ -465,7 +465,7 @@ WebView *MacWebKitHelpWidget::webView() const
 
 void MacWebKitHelpWidget::startToolTipTimer(const QPoint &pos, const QString &text)
 {
-    int delay = style()->styleHint(QStyle::SH_ToolTip_WakeUpDelay, 0, this, 0);
+    int delay = style()->styleHint(QStyle::SH_ToolTip_WakeUpDelay, nullptr, this, nullptr);
     d->m_toolTipPos = pos;
     d->m_toolTipText = text;
     d->m_toolTipTimer.start(delay);
@@ -558,21 +558,21 @@ void MacWebKitHelpViewer::setViewerFont(const QFont &font)
 void MacWebKitHelpViewer::scaleUp()
 {
     @autoreleasepool {
-        m_widget->webView().textSizeMultiplier += 0.1;
+        m_widget->webView().textSizeMultiplier += 0.1f;
     }
 }
 
 void MacWebKitHelpViewer::scaleDown()
 {
     @autoreleasepool {
-        m_widget->webView().textSizeMultiplier = qMax(0.1, m_widget->webView().textSizeMultiplier - 0.1);
+        m_widget->webView().textSizeMultiplier = qMax(0.1f, m_widget->webView().textSizeMultiplier - 0.1f);
     }
 }
 
 void MacWebKitHelpViewer::resetScale()
 {
     @autoreleasepool {
-        m_widget->webView().textSizeMultiplier = 1.0;
+        m_widget->webView().textSizeMultiplier = 1.0f;
     }
 }
 
diff --git a/src/plugins/help/openpagesmanager.cpp b/src/plugins/help/openpagesmanager.cpp
index 2fd78a57bc..63d9a5cda0 100644
--- a/src/plugins/help/openpagesmanager.cpp
+++ b/src/plugins/help/openpagesmanager.cpp
@@ -46,16 +46,12 @@
 using namespace Core;
 using namespace Help::Internal;
 
-OpenPagesManager *OpenPagesManager::m_instance = 0;
+OpenPagesManager *OpenPagesManager::m_instance = nullptr;
 
 // -- OpenPagesManager
 
 OpenPagesManager::OpenPagesManager(QObject *parent)
     : QObject(parent)
-    , m_comboBox(0)
-    , m_model(0)
-    , m_openPagesWidget(0)
-    , m_openPagesSwitcher(0)
 {
     Q_ASSERT(!m_instance);
 
@@ -79,7 +75,7 @@ OpenPagesManager::OpenPagesManager(QObject *parent)
 
 OpenPagesManager ::~OpenPagesManager()
 {
-    m_instance = 0;
+    m_instance = nullptr;
     delete m_openPagesSwitcher;
 }
 
@@ -180,7 +176,7 @@ HelpViewer *OpenPagesManager::createPage()
 HelpViewer *OpenPagesManager::createPage(const QUrl &url)
 {
     if (url.isValid() && HelpViewer::launchWithExternalApp(url))
-        return 0;
+        return nullptr;
 
     m_model->addPage(url);
 
diff --git a/src/plugins/help/openpagesmanager.h b/src/plugins/help/openpagesmanager.h
index 203cb37943..6c85e08675 100644
--- a/src/plugins/help/openpagesmanager.h
+++ b/src/plugins/help/openpagesmanager.h
@@ -47,7 +47,7 @@ class OpenPagesManager : public QObject
     Q_OBJECT
 
 public:
-    OpenPagesManager(QObject *parent = 0);
+    OpenPagesManager(QObject *parent = nullptr);
     ~OpenPagesManager();
 
     static OpenPagesManager &instance();
@@ -79,10 +79,10 @@ private:
     void showTwicherOrSelectPage() const;
     void openPagesContextMenu(const QPoint &point);
 
-    QComboBox *m_comboBox;
-    OpenPagesModel *m_model;
-    mutable OpenPagesWidget *m_openPagesWidget;
-    OpenPagesSwitcher *m_openPagesSwitcher;
+    QComboBox *m_comboBox = nullptr;
+    OpenPagesModel *m_model = nullptr;
+    mutable OpenPagesWidget *m_openPagesWidget = nullptr;
+    OpenPagesSwitcher *m_openPagesSwitcher = nullptr;
 
     static OpenPagesManager *m_instance;
 };
diff --git a/src/plugins/help/openpagesswitcher.cpp b/src/plugins/help/openpagesswitcher.cpp
index 0fb5b15140..5f5b80f944 100644
--- a/src/plugins/help/openpagesswitcher.cpp
+++ b/src/plugins/help/openpagesswitcher.cpp
@@ -42,7 +42,7 @@ const int gWidth = 300;
 const int gHeight = 200;
 
 OpenPagesSwitcher::OpenPagesSwitcher(OpenPagesModel *model)
-    : QFrame(0, Qt::Popup)
+    : QFrame(nullptr, Qt::Popup)
     , m_openPagesModel(model)
 {
     resize(gWidth, gHeight);
diff --git a/src/plugins/help/openpagesswitcher.h b/src/plugins/help/openpagesswitcher.h
index 2903e486ad..350b352d78 100644
--- a/src/plugins/help/openpagesswitcher.h
+++ b/src/plugins/help/openpagesswitcher.h
@@ -61,8 +61,8 @@ private:
     void selectPageUpDown(int summand);
 
 private:
-    OpenPagesModel *m_openPagesModel;
-    OpenPagesWidget *m_openPagesWidget;
+    OpenPagesModel *m_openPagesModel = nullptr;
+    OpenPagesWidget *m_openPagesWidget = nullptr;
 };
 
     }   // namespace Internal
diff --git a/src/plugins/help/openpageswidget.cpp b/src/plugins/help/openpageswidget.cpp
index a6ee23bda0..0878b03fd8 100644
--- a/src/plugins/help/openpageswidget.cpp
+++ b/src/plugins/help/openpageswidget.cpp
@@ -116,7 +116,7 @@ void OpenPagesWidget::handleActivated(const QModelIndex &index)
         // work around a bug in itemviews where the delegate wouldn't get the QStyle::State_MouseOver
         QWidget *vp = viewport();
         const QPoint &cursorPos = QCursor::pos();
-        QMouseEvent e(QEvent::MouseMove, vp->mapFromGlobal(cursorPos), cursorPos, Qt::NoButton, 0, 0);
+        QMouseEvent e(QEvent::MouseMove, vp->mapFromGlobal(cursorPos), cursorPos, Qt::NoButton, nullptr, nullptr);
         QCoreApplication::sendEvent(vp, &e);
     }
 }
diff --git a/src/plugins/help/openpageswidget.h b/src/plugins/help/openpageswidget.h
index 33686df2ea..80b957bd2c 100644
--- a/src/plugins/help/openpageswidget.h
+++ b/src/plugins/help/openpageswidget.h
@@ -37,7 +37,7 @@ class OpenPagesWidget : public Core::OpenDocumentsTreeView
     Q_OBJECT
 
 public:
-    explicit OpenPagesWidget(OpenPagesModel *model, QWidget *parent = 0);
+    explicit OpenPagesWidget(OpenPagesModel *model, QWidget *parent = nullptr);
     ~OpenPagesWidget();
 
     void selectCurrentPage();
diff --git a/src/plugins/help/remotehelpfilter.h b/src/plugins/help/remotehelpfilter.h
index 146b537ec2..550c67fc86 100644
--- a/src/plugins/help/remotehelpfilter.h
+++ b/src/plugins/help/remotehelpfilter.h
@@ -40,7 +40,7 @@ class RemoteHelpFilter : public Core::ILocatorFilter
     Q_OBJECT
 public:
     RemoteHelpFilter();
-    ~RemoteHelpFilter();
+    ~RemoteHelpFilter() final;
 
     // ILocatorFilter
     QList<Core::LocatorFilterEntry> matchesFor(QFutureInterface<Core::LocatorFilterEntry> &future,
diff --git a/src/plugins/help/searchwidget.cpp b/src/plugins/help/searchwidget.cpp
index c3bcd1c314..a605e0958a 100644
--- a/src/plugins/help/searchwidget.cpp
+++ b/src/plugins/help/searchwidget.cpp
@@ -56,10 +56,6 @@
 using namespace Help::Internal;
 
 SearchWidget::SearchWidget()
-    : zoomCount(0)
-    , m_progress(0)
-    , searchEngine(0)
-    , resultWidget(0)
 {
 }
 
@@ -226,7 +222,7 @@ void SearchWidget::indexingFinished()
     m_progress->reportFinished();
 
     delete m_progress;
-    m_progress = NULL;
+    m_progress = nullptr;
 
     m_queryWidget->show();
     m_indexingDocumentationLabel->hide();
@@ -261,9 +257,9 @@ void SearchWidget::contextMenuEvent(QContextMenuEvent *contextMenuEvent)
     if (!browser->rect().contains(point, true))
         return;
 
-    QAction *openLink = 0;
-    QAction *openLinkInNewTab = 0;
-    QAction *copyAnchorAction = 0;
+    QAction *openLink = nullptr;
+    QAction *openLinkInNewTab = nullptr;
+    QAction *copyAnchorAction = nullptr;
 
     QMenu menu;
     QUrl link = browser->anchorAt(point);
diff --git a/src/plugins/help/searchwidget.h b/src/plugins/help/searchwidget.h
index 6464099d5a..5f4e5c4fc6 100644
--- a/src/plugins/help/searchwidget.h
+++ b/src/plugins/help/searchwidget.h
@@ -89,16 +89,16 @@ private:
     void contextMenuEvent(QContextMenuEvent *contextMenuEvent);
     QStringList currentSearchTerms() const;
 
-    int zoomCount;
+    int zoomCount = 0;
 
     QFutureWatcher<void> m_watcher;
-    QFutureInterface<void> *m_progress;
+    QFutureInterface<void> *m_progress = nullptr;
 
-    QHelpSearchEngine *searchEngine;
-    QHelpSearchResultWidget *resultWidget;
-    QHelpSearchQueryWidget *m_queryWidget;
-    QWidget *m_indexingDocumentationLabel;
-    Utils::ProgressIndicator *m_indexingIndicator;
+    QHelpSearchEngine *searchEngine = nullptr;
+    QHelpSearchResultWidget *resultWidget = nullptr;
+    QHelpSearchQueryWidget *m_queryWidget = nullptr;
+    QWidget *m_indexingDocumentationLabel = nullptr;
+    Utils::ProgressIndicator *m_indexingIndicator = nullptr;
 };
 
 } // namespace Internal
diff --git a/src/plugins/help/textbrowserhelpviewer.cpp b/src/plugins/help/textbrowserhelpviewer.cpp
index 34e821e524..930df58207 100644
--- a/src/plugins/help/textbrowserhelpviewer.cpp
+++ b/src/plugins/help/textbrowserhelpviewer.cpp
@@ -121,12 +121,12 @@ void TextBrowserHelpViewer::setScale(qreal scale)
         scale = 10;
     else if (scale < -5)
         scale = -5;
-    int diff = (int)scale - m_textBrowser->zoomCount;
+    int diff = int(scale) - m_textBrowser->zoomCount;
     if (diff > 0)
         m_textBrowser->zoomIn(diff);
     else if (diff < 0)
         m_textBrowser->zoomOut(-diff);
-    m_textBrowser->zoomCount = (int)scale;
+    m_textBrowser->zoomCount = int(scale);
     m_textBrowser->forceFont = false;
 }
 
@@ -354,9 +354,9 @@ void TextBrowserHelpWidget::scaleDown()
 
 void TextBrowserHelpWidget::contextMenuEvent(QContextMenuEvent *event)
 {
-    QMenu menu("", 0);
+    QMenu menu("", nullptr);
 
-    QAction *copyAnchorAction = 0;
+    QAction *copyAnchorAction = nullptr;
     const QUrl link(linkAt(event->pos()));
     if (!link.isEmpty() && link.isValid()) {
         QAction *action = menu.addAction(tr("Open Link"));
diff --git a/src/plugins/help/textbrowserhelpviewer.h b/src/plugins/help/textbrowserhelpviewer.h
index 068baee028..38b3180983 100644
--- a/src/plugins/help/textbrowserhelpviewer.h
+++ b/src/plugins/help/textbrowserhelpviewer.h
@@ -41,7 +41,7 @@ class TextBrowserHelpViewer : public HelpViewer
     Q_OBJECT
 
 public:
-    explicit TextBrowserHelpViewer(QWidget *parent = 0);
+    explicit TextBrowserHelpViewer(QWidget *parent = nullptr);
     ~TextBrowserHelpViewer();
 
     QFont viewerFont() const;
@@ -64,7 +64,7 @@ public:
     void addForwardHistoryItems(QMenu *forwardMenu);
 
     bool findText(const QString &text, Core::FindFlags flags,
-                  bool incremental, bool fromSearch, bool *wrapped = 0);
+                  bool incremental, bool fromSearch, bool *wrapped = nullptr);
 
     void scaleUp();
     void scaleDown();
diff --git a/src/plugins/help/webenginehelpviewer.h b/src/plugins/help/webenginehelpviewer.h
index 390e90ea65..e060c8d718 100644
--- a/src/plugins/help/webenginehelpviewer.h
+++ b/src/plugins/help/webenginehelpviewer.h
@@ -38,14 +38,14 @@ class WebEngineHelpViewer;
 class HelpUrlSchemeHandler : public QWebEngineUrlSchemeHandler
 {
 public:
-    explicit HelpUrlSchemeHandler(QObject *parent = 0);
+    explicit HelpUrlSchemeHandler(QObject *parent = nullptr);
     void requestStarted(QWebEngineUrlRequestJob *job) override;
 };
 
 class WebEngineHelpPage : public QWebEnginePage
 {
 public:
-    explicit WebEngineHelpPage(QObject *parent = 0);
+    explicit WebEngineHelpPage(QObject *parent = nullptr);
 #if QT_VERSION < QT_VERSION_CHECK(5, 7, 0)
     QWebEnginePage *createWindow(QWebEnginePage::WebWindowType) override;
 #endif
@@ -67,7 +67,7 @@ class WebEngineHelpViewer : public HelpViewer
 {
     Q_OBJECT
 public:
-    explicit WebEngineHelpViewer(QWidget *parent = 0);
+    explicit WebEngineHelpViewer(QWidget *parent = nullptr);
 
     QFont viewerFont() const override;
     void setViewerFont(const QFont &font) override;
diff --git a/src/plugins/help/xbelsupport.cpp b/src/plugins/help/xbelsupport.cpp
index ab9db674ad..ea4313f5bc 100644
--- a/src/plugins/help/xbelsupport.cpp
+++ b/src/plugins/help/xbelsupport.cpp
@@ -133,9 +133,9 @@ void XbelReader::readXBEL()
 
         if (isStartElement()) {
             if (name() == "folder")
-                readFolder(0);
+                readFolder(nullptr);
             else if (name() == "bookmark")
-                readBookmark(0);
+                readBookmark(nullptr);
             else
                 readUnknownElement();
         }