chore: Use `nullptr` instead of `0` for NULL pointer constants.

src/audio/backend/openal.cpp

@@ -633,9 +633,9 @@ bool OpenAL::isOutputReady() const
 QStringList OpenAL::outDeviceNames()
 {
     QStringList list;
-    const ALchar* pDeviceList = (alcIsExtensionPresent(NULL, "ALC_ENUMERATE_ALL_EXT") != AL_FALSE)
-                                    ? alcGetString(NULL, ALC_ALL_DEVICES_SPECIFIER)
-                                    : alcGetString(NULL, ALC_DEVICE_SPECIFIER);
+    const ALchar* pDeviceList = (alcIsExtensionPresent(nullptr, "ALC_ENUMERATE_ALL_EXT") != AL_FALSE)
+                                    ? alcGetString(nullptr, ALC_ALL_DEVICES_SPECIFIER)
+                                    : alcGetString(nullptr, ALC_DEVICE_SPECIFIER);
 
     if (pDeviceList) {
         while (*pDeviceList) {
@@ -651,7 +651,7 @@ QStringList OpenAL::outDeviceNames()
 QStringList OpenAL::inDeviceNames()
 {
     QStringList list;
-    const ALchar* pDeviceList = alcGetString(NULL, ALC_CAPTURE_DEVICE_SPECIFIER);
+    const ALchar* pDeviceList = alcGetString(nullptr, ALC_CAPTURE_DEVICE_SPECIFIER);
 
     if (pDeviceList) {
         while (*pDeviceList) {

src/audio/backend/openal2.cpp

@@ -164,7 +164,7 @@ bool OpenAL2::initOutputEchoCancel()
                       Audio::AUDIO_SAMPLE_RATE,
                       0}; // End of List
 
-    alProxyDev = alcLoopbackOpenDeviceSOFT(NULL);
+    alProxyDev = alcLoopbackOpenDeviceSOFT(nullptr);
     checkAlcError(alProxyDev);
     if (!alProxyDev) {
         qDebug() << "Couldn't create proxy device";

src/chatlog/chatlog.h

@@ -38,7 +38,7 @@ class ChatLog : public QGraphicsView
 {
     Q_OBJECT
 public:
-    explicit ChatLog(QWidget* parent = 0);
+    explicit ChatLog(QWidget* parent = nullptr);
     virtual ~ChatLog();
 
     void insertChatlineAtBottom(ChatLine::Ptr l);

src/chatlog/chatmessage.cpp

@@ -144,7 +144,7 @@ ChatMessage::Ptr ChatMessage::createFileTransferMessage(const QString& sender, T
 
     msg->addColumn(new Text(sender, authorFont, true),
                    ColumnFormat(NAME_COL_WIDTH, ColumnFormat::FixedSize, ColumnFormat::Right));
-    msg->addColumn(new ChatLineContentProxy(new FileTransferWidget(0, file), 320, 0.6f),
+    msg->addColumn(new ChatLineContentProxy(new FileTransferWidget(nullptr, file), 320, 0.6f),
                    ColumnFormat(1.0, ColumnFormat::VariableSize));
     msg->addColumn(new Timestamp(date, Settings::getInstance().getTimestampFormat(), baseFont),
                    ColumnFormat(TIME_COL_WIDTH, ColumnFormat::FixedSize, ColumnFormat::Right));

src/chatlog/content/filetransferwidget.cpp

@@ -331,7 +331,7 @@ void FileTransferWidget::onFileTransferCancelled(ToxFile file)
     setupButtons();
     hideWidgets();
 
-    disconnect(Core::getInstance(), 0, this, 0);
+    disconnect(Core::getInstance(), nullptr, this, nullptr);
 }
 
 void FileTransferWidget::onFileTransferPaused(ToxFile file)
@@ -401,7 +401,7 @@ void FileTransferWidget::onFileTransferFinished(ToxFile file)
     if (fileInfo.direction == ToxFile::RECEIVING)
         showPreview(fileInfo.filePath);
 
-    disconnect(Core::getInstance(), 0, this, 0);
+    disconnect(Core::getInstance(), nullptr, this, nullptr);
 }
 
 void FileTransferWidget::fileTransferRemotePausedUnpaused(ToxFile file, bool paused)

src/ipc.cpp

@@ -64,7 +64,7 @@ IPC::IPC(uint32_t profileId)
             IPCMemory* mem = global();
             memset(mem, 0, sizeof(IPCMemory));
             mem->globalId = globalId;
-            mem->lastProcessed = time(0);
+            mem->lastProcessed = time(nullptr);
             globalMemory.unlock();
         } else {
             qWarning() << "Couldn't lock to take ownership";
@@ -122,7 +122,7 @@ time_t IPC::postEvent(const QString& name, const QByteArray& data, uint32_t dest
             memset(evt, 0, sizeof(IPCEvent));
             memcpy(evt->name, binName.constData(), binName.length());
             memcpy(evt->data, data.constData(), data.length());
-            mem->lastEvent = evt->posted = result = qMax(mem->lastEvent + 1, time(0));
+            mem->lastEvent = evt->posted = result = qMax(mem->lastEvent + 1, time(nullptr));
             evt->dest = dest;
             evt->sender = getpid();
             qDebug() << "postEvent " << name << "to" << dest;
@@ -177,11 +177,11 @@ bool IPC::isEventAccepted(time_t time)
 bool IPC::waitUntilAccepted(time_t postTime, int32_t timeout /*=-1*/)
 {
     bool result = false;
-    time_t start = time(0);
+    time_t start = time(nullptr);
     forever
     {
         result = isEventAccepted(postTime);
-        if (result || (timeout > 0 && difftime(time(0), start) >= timeout))
+        if (result || (timeout > 0 && difftime(time(nullptr), start) >= timeout))
             break;
 
         qApp->processEvents();
@@ -213,8 +213,8 @@ IPC::IPCEvent* IPC::fetchEvent()
         // Garbage-collect events that were not processed in EVENT_GC_TIMEOUT
         // and events that were processed and EVENT_GC_TIMEOUT passed after
         // so sending instance has time to react to those events.
-        if ((evt->processed && difftime(time(0), evt->processed) > EVENT_GC_TIMEOUT)
-            || (!evt->processed && difftime(time(0), evt->posted) > EVENT_GC_TIMEOUT))
+        if ((evt->processed && difftime(time(nullptr), evt->processed) > EVENT_GC_TIMEOUT)
+            || (!evt->processed && difftime(time(nullptr), evt->posted) > EVENT_GC_TIMEOUT))
             memset(evt, 0, sizeof(IPCEvent));
 
         if (evt->posted && !evt->processed && evt->sender != getpid()
@@ -245,17 +245,17 @@ void IPC::processEvents()
 
         if (mem->globalId == globalId) {
             // We're the owner, let's process those events
-            mem->lastProcessed = time(0);
+            mem->lastProcessed = time(nullptr);
         } else {
             // Only the owner processes events. But if the previous owner's dead, we can take
             // ownership now
-            if (difftime(time(0), mem->lastProcessed) >= OWNERSHIP_TIMEOUT_S) {
+            if (difftime(time(nullptr), mem->lastProcessed) >= OWNERSHIP_TIMEOUT_S) {
                 qDebug() << "Previous owner timed out, taking ownership" << mem->globalId << "->"
                          << globalId;
                 // Ignore events that were not meant for this instance
                 memset(mem, 0, sizeof(IPCMemory));
                 mem->globalId = globalId;
-                mem->lastProcessed = time(0);
+                mem->lastProcessed = time(nullptr);
             }
             // Non-main instance is limited to events destined for specific profile it runs
         }
@@ -271,9 +271,9 @@ void IPC::processEvents()
                     // Otherwise global
                     // event would be consumed by very first instance that gets to check it.
                     if (evt->accepted)
-                        evt->processed = time(0);
+                        evt->processed = time(nullptr);
                 } else {
-                    evt->processed = time(0);
+                    evt->processed = time(nullptr);
                 }
             }
         }

src/main.cpp

@@ -181,7 +181,7 @@ int main(int argc, char* argv[])
     osx::migrateProfiles();
 #endif
 
-    qsrand(time(0));
+    qsrand(time(nullptr));
     Settings::getInstance();
     QString locale = Settings::getInstance().getTranslation();
     Translator::translate(locale);

src/nexus.h

@@ -85,7 +85,7 @@ private:
 #endif
 
 private:
-    explicit Nexus(QObject* parent = 0);
+    explicit Nexus(QObject* parent = nullptr);
     ~Nexus();
 
 private:

src/persistence/db/rawdatabase.cpp

@@ -163,13 +163,13 @@ bool RawDatabase::open(const QString& path, const QString& hexKey)
         return false;
     }
 
-    if (sqlite3_create_function(sqlite, "regexp", 2, SQLITE_UTF8, NULL, &RawDatabase::regexpInsensitive, NULL, NULL)) {
+    if (sqlite3_create_function(sqlite, "regexp", 2, SQLITE_UTF8, nullptr, &RawDatabase::regexpInsensitive, nullptr, nullptr)) {
         qWarning() << "Failed to create function regexp";
         close();
         return false;
     }
 
-    if (sqlite3_create_function(sqlite, "regexpsensitive", 2, SQLITE_UTF8, NULL, &RawDatabase::regexpSensitive, NULL, NULL)) {
+    if (sqlite3_create_function(sqlite, "regexpsensitive", 2, SQLITE_UTF8, nullptr, &RawDatabase::regexpSensitive, nullptr, nullptr)) {
         qWarning() << "Failed to create function regexpsensitive";
         close();
         return false;

src/platform/posixsignalnotifier.cpp

@@ -88,7 +88,7 @@ void PosixSignalNotifier::watchSignal(int signum)
     action.sa_handler = detail::signalHandler;
     action.sa_mask = blockMask; // allow old signal to finish before new is raised
 
-    if (::sigaction(signum, &action, 0)) {
+    if (::sigaction(signum, &action, nullptr)) {
         qFatal("Failed to setup signal %d, error = %d", signum, errno);
     }
 }

src/video/cameradevice.cpp

@@ -112,7 +112,7 @@ CameraDevice* CameraDevice::open(QString devName, AVDictionary** options)
     aduration = fctx->max_analyze_duration = 0;
 #endif
 
-    if (avformat_find_stream_info(fctx, NULL) < 0) {
+    if (avformat_find_stream_info(fctx, nullptr) < 0) {
         avformat_close_input(&fctx);
         goto out;
     }
@@ -297,7 +297,7 @@ QVector<QPair<QString, QString>> CameraDevice::getRawDeviceListGeneric()
             av_opt_set_defaults(s->priv_data);
         }
     } else {
-        s->priv_data = NULL;
+        s->priv_data = nullptr;
     }
 
     // List the devices for this context

src/video/groupnetcamview.cpp

@@ -36,11 +36,11 @@
 class LabeledVideo : public QFrame
 {
 public:
-    LabeledVideo(const QPixmap& avatar, QWidget* parent = 0, bool expanding = true)
+    LabeledVideo(const QPixmap& avatar, QWidget* parent = nullptr, bool expanding = true)
         : QFrame(parent)
     {
         qDebug() << "Created expanding? " << expanding;
-        videoSurface = new VideoSurface(avatar, 0, expanding);
+        videoSurface = new VideoSurface(avatar, nullptr, expanding);
         videoSurface->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
         videoSurface->setMinimumHeight(32);
 

src/video/groupnetcamview.h

@@ -32,7 +32,7 @@ class QHBoxLayout;
 class GroupNetCamView : public GenericNetCamView
 {
 public:
-    GroupNetCamView(int group, QWidget* parent = 0);
+    GroupNetCamView(int group, QWidget* parent = nullptr);
     void clearPeers();
     void addPeer(const ToxPk& peer, const QString& name);
     void removePeer(const ToxPk& peer);

src/video/netcamview.h

@@ -34,7 +34,7 @@ class NetCamView : public GenericNetCamView
     Q_OBJECT
 
 public:
-    NetCamView(int friendId, QWidget* parent = 0);
+    NetCamView(int friendId, QWidget* parent = nullptr);
     ~NetCamView();
 
     virtual void show(VideoSource* source, const QString& title);

src/video/videosurface.h

@@ -30,8 +30,8 @@ class VideoSurface : public QWidget
     Q_OBJECT
 
 public:
-    VideoSurface(const QPixmap& avatar, QWidget* parent = 0, bool expanding = false);
-    VideoSurface(const QPixmap& avatar, VideoSource* source, QWidget* parent = 0);
+    VideoSurface(const QPixmap& avatar, QWidget* parent = nullptr, bool expanding = false);
+    VideoSurface(const QPixmap& avatar, VideoSource* source, QWidget* parent = nullptr);
     ~VideoSurface();
 
     bool isExpanding() const;

src/widget/about/aboutfriendform.h

@@ -17,7 +17,7 @@ class AboutFriendForm : public QDialog
     Q_OBJECT
 
 public:
-    AboutFriendForm(std::unique_ptr<IAboutFriend> about, QWidget* parent = 0);
+    AboutFriendForm(std::unique_ptr<IAboutFriend> about, QWidget* parent = nullptr);
     ~AboutFriendForm();
 
 private:

src/widget/categorywidget.h

@@ -33,7 +33,7 @@ class CategoryWidget : public GenericChatItemWidget
 {
     Q_OBJECT
 public:
-    explicit CategoryWidget(bool compact, QWidget* parent = 0);
+    explicit CategoryWidget(bool compact, QWidget* parent = nullptr);
 
     bool isExpanded() const;
     void setExpanded(bool isExpanded, bool save = true);

src/widget/contentlayout.cpp

@@ -69,13 +69,13 @@ ContentLayout::~ContentLayout()
 void ContentLayout::clear()
 {
     QLayoutItem* item;
-    while ((item = mainHead->layout()->takeAt(0)) != 0) {
+    while ((item = mainHead->layout()->takeAt(0)) != nullptr) {
         item->widget()->hide();
         item->widget()->setParent(nullptr);
         delete item;
     }
 
-    while ((item = mainContent->layout()->takeAt(0)) != 0) {
+    while ((item = mainContent->layout()->takeAt(0)) != nullptr) {
         item->widget()->hide();
         item->widget()->setParent(nullptr);
         delete item;

src/widget/emoticonswidget.h

@@ -33,7 +33,7 @@ class EmoticonsWidget : public QMenu
 {
     Q_OBJECT
 public:
-    explicit EmoticonsWidget(QWidget* parent = 0);
+    explicit EmoticonsWidget(QWidget* parent = nullptr);
 
 signals:
     void insertEmoticon(QString str);

src/widget/flowlayout.cpp

@@ -99,12 +99,12 @@ QLayoutItem* FlowLayout::takeAt(int index)
     if (index >= 0 && index < itemList.size())
         return itemList.takeAt(index);
     else
-        return 0;
+        return nullptr;
 }
 
 Qt::Orientations FlowLayout::expandingDirections() const
 {
-    return 0;
+    return nullptr;
 }
 
 bool FlowLayout::hasHeightForWidth() const
@@ -184,7 +184,7 @@ int FlowLayout::smartSpacing(QStyle::PixelMetric pm) const
         return -1;
     } else if (parent->isWidgetType()) {
         QWidget* pw = static_cast<QWidget*>(parent);
-        return pw->style()->pixelMetric(pm, 0, pw);
+        return pw->style()->pixelMetric(pm, nullptr, pw);
     } else {
         return static_cast<QLayout*>(parent)->spacing();
     }

src/widget/form/chatform.cpp

@@ -268,7 +268,7 @@ void ChatForm::onTextEditChanged()
 void ChatForm::onAttachClicked()
 {
     QStringList paths =
-        QFileDialog::getOpenFileNames(Q_NULLPTR, tr("Send a file"), QDir::homePath(), 0, 0);
+        QFileDialog::getOpenFileNames(Q_NULLPTR, tr("Send a file"), QDir::homePath(), nullptr, nullptr);
 
     if (paths.isEmpty()) {
         return;
@@ -714,7 +714,7 @@ void ChatForm::dropEvent(QDropEvent* ev)
 
         file.close();
         if (file.isSequential()) {
-            QMessageBox::critical(0, tr("Bad idea"),
+            QMessageBox::critical(nullptr, tr("Bad idea"),
                                   tr("You're trying to send a sequential file, "
                                      "which is not going to work!"));
             continue;

src/widget/form/loadhistorydialog.h

@@ -33,8 +33,8 @@ class LoadHistoryDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit LoadHistoryDialog(const ToxPk& friendPk, QWidget* parent = 0);
-    explicit LoadHistoryDialog(QWidget* parent = 0);
+    explicit LoadHistoryDialog(const ToxPk& friendPk, QWidget* parent = nullptr);
+    explicit LoadHistoryDialog(QWidget* parent = nullptr);
     ~LoadHistoryDialog();
 
     QDateTime getFromDate();

src/widget/form/setpassworddialog.h

@@ -37,7 +37,7 @@ public:
         Accepted = QDialog::Accepted,
         Tertiary
     };
-    explicit SetPasswordDialog(QString body, QString extraButton, QWidget* parent = 0);
+    explicit SetPasswordDialog(QString body, QString extraButton, QWidget* parent = nullptr);
     ~SetPasswordDialog();
     QString getPassword();
     static int getPasswordStrength(QString pass);

src/widget/form/settings/avform.cpp

@@ -614,7 +614,7 @@ void AVForm::killVideoSurface()
         return;
 
     QLayoutItem* child;
-    while ((child = gridLayout->takeAt(0)) != 0)
+    while ((child = gridLayout->takeAt(0)) != nullptr)
         delete child;
 
     camVideoSurface->close();

src/widget/form/settings/privacyform.cpp

@@ -62,7 +62,7 @@ void PrivacyForm::on_cbKeepHistory_stateChanged()
     if (!bodyUI->cbKeepHistory->isChecked()) {
         QMessageBox::StandardButton dialogDelHistory;
         dialogDelHistory =
-            QMessageBox::question(0, tr("Confirmation"),
+            QMessageBox::question(nullptr, tr("Confirmation"),
                                   tr("Do you want to permanently delete all chat history?"),
                                   QMessageBox::Yes | QMessageBox::No);
         if (dialogDelHistory == QMessageBox::Yes) {

src/widget/form/settings/verticalonlyscroller.h

@@ -29,7 +29,7 @@ class VerticalOnlyScroller : public QScrollArea
 {
     Q_OBJECT
 public:
-    explicit VerticalOnlyScroller(QWidget* parent = 0);
+    explicit VerticalOnlyScroller(QWidget* parent = nullptr);
 
 protected:
     virtual void resizeEvent(QResizeEvent* event) final override;

src/widget/genericchatitemlayout.h

@@ -27,7 +27,7 @@ public:
     GenericChatItemLayout(const GenericChatItemLayout& layout) = delete;
     ~GenericChatItemLayout();
 
-    void addSortedWidget(GenericChatItemWidget* widget, int stretch = 0, Qt::Alignment alignment = 0);
+    void addSortedWidget(GenericChatItemWidget* widget, int stretch = 0, Qt::Alignment alignment = nullptr);
     int indexOfSortedWidget(GenericChatItemWidget* widget) const;
     bool existsSortedWidget(GenericChatItemWidget* widget) const;
     void removeSortedWidget(GenericChatItemWidget* widget);

src/widget/genericchatroomwidget.h

@@ -34,7 +34,7 @@ class GenericChatroomWidget : public GenericChatItemWidget
 {
     Q_OBJECT
 public:
-    explicit GenericChatroomWidget(bool compact, QWidget* parent = 0);
+    explicit GenericChatroomWidget(bool compact, QWidget* parent = nullptr);
 
 public slots:
     virtual void setAsActiveChatroom() = 0;

src/widget/gui.h

@@ -47,13 +47,13 @@ public:
 
     static QString itemInputDialog(QWidget* parent, const QString& title, const QString& label,
                                    const QStringList& items, int current = 0, bool editable = true,
-                                   bool* ok = 0, Qt::WindowFlags flags = 0,
+                                   bool* ok = nullptr, Qt::WindowFlags flags = nullptr,
                                    Qt::InputMethodHints hints = Qt::ImhNone);
 
     static QString passwordDialog(const QString& cancel, const QString& body);
 
 private:
-    explicit GUI(QObject* parent = 0);
+    explicit GUI(QObject* parent = nullptr);
 
 private slots:
     // Private implementation, those must be called from the GUI thread
@@ -71,7 +71,7 @@ private slots:
                       const QString& button2, bool defaultAns = false, bool warning = true);
     QString _itemInputDialog(QWidget* parent, const QString& title, const QString& label,
                              const QStringList& items, int current = 0, bool editable = true,
-                             bool* ok = 0, Qt::WindowFlags flags = 0,
+                             bool* ok = nullptr, Qt::WindowFlags flags = nullptr,
                              Qt::InputMethodHints inputMethodHints = Qt::ImhNone);
     QString _passwordDialog(const QString& cancel, const QString& body);
 };

src/widget/notificationedgewidget.h

@@ -34,7 +34,7 @@ public:
         Bottom
     };
 
-    explicit NotificationEdgeWidget(Position position, QWidget* parent = 0);
+    explicit NotificationEdgeWidget(Position position, QWidget* parent = nullptr);
     void updateNotificationCount(int count);
 
 signals:

src/widget/notificationscrollarea.h

@@ -29,7 +29,7 @@ class NotificationEdgeWidget;
 class NotificationScrollArea final : public AdjustingScrollArea
 {
 public:
-    explicit NotificationScrollArea(QWidget* parent = 0);
+    explicit NotificationScrollArea(QWidget* parent = nullptr);
 
 public slots:
     void trackWidget(GenericChatroomWidget* widget);

src/widget/qrwidget.cpp

@@ -71,9 +71,8 @@ QImage* QRWidget::getImage()
  */
 bool QRWidget::saveImage(QString path)
 {
-    return image
-        ->save(path, 0,
-               75); // 0 - image format same as file extension, 75-quality, png file is ~6.3kb
+    // 0 - image format same as file extension, 75-quality, png file is ~6.3kb
+    return image->save(path, nullptr, 75);
 }
 
 // http://stackoverflow.com/questions/21400254/how-to-draw-a-qr-code-with-qt-in-native-c-c

src/widget/qrwidget.h

@@ -28,7 +28,7 @@ class QRWidget : public QWidget
     Q_OBJECT
 
 public:
-    explicit QRWidget(QWidget* parent = 0);
+    explicit QRWidget(QWidget* parent = nullptr);
     ~QRWidget();
     void setQRData(const QString& data);
     QImage* getImage();

src/widget/systemtrayicon.cpp

@@ -120,7 +120,7 @@ GdkPixbuf* SystemTrayIcon::convertQIconToPixbuf(const QIcon& icon)
 
     return gdk_pixbuf_new_from_data(image_bytes, GDK_COLORSPACE_RGB, image.hasAlphaChannel(), 8,
                                     image.width(), image.height(), image.bytesPerLine(),
-                                    callbackFreeImage, NULL);
+                                    callbackFreeImage, nullptr);
 }
 #endif
 
@@ -231,8 +231,8 @@ void SystemTrayIcon::setContextMenu(QMenu* menu)
         app_indicator_set_menu(unityIndicator, GTK_MENU(unityMenu));
         DbusmenuServer* menuServer;
         DbusmenuMenuitem* rootMenuItem;
-        g_object_get(unityIndicator, "dbus-menu-server", &menuServer, NULL);
-        g_object_get(menuServer, "root-node", &rootMenuItem, NULL);
+        g_object_get(unityIndicator, "dbus-menu-server", &menuServer, nullptr);
+        g_object_get(menuServer, "root-node", &rootMenuItem, nullptr);
         void (*callback)(DbusmenuMenuitem*, gpointer) = [](DbusmenuMenuitem*, gpointer data) {
             static_cast<SystemTrayIcon*>(data)->activated(QSystemTrayIcon::Unknown);
         };

src/widget/tool/activatedialog.h

@@ -26,7 +26,7 @@ class ActivateDialog : public QDialog
 {
     Q_OBJECT
 public:
-    ActivateDialog(QWidget* parent = 0, Qt::WindowFlags f = 0);
+    ActivateDialog(QWidget* parent = nullptr, Qt::WindowFlags f = nullptr);
     bool event(QEvent* event) override;
 
 signals:

src/widget/tool/adjustingscrollarea.h

@@ -26,7 +26,7 @@ class AdjustingScrollArea : public QScrollArea
 {
     Q_OBJECT
 public:
-    explicit AdjustingScrollArea(QWidget* parent = 0);
+    explicit AdjustingScrollArea(QWidget* parent = nullptr);
     virtual ~AdjustingScrollArea() = default;
 
 protected:

src/widget/tool/chattextedit.h

@@ -26,7 +26,7 @@ class ChatTextEdit final : public QTextEdit
 {
     Q_OBJECT
 public:
-    explicit ChatTextEdit(QWidget* parent = 0);
+    explicit ChatTextEdit(QWidget* parent = nullptr);
     ~ChatTextEdit();
     void setLastMessage(QString lm);
     void sendKeyEvent(QKeyEvent* event);

src/widget/tool/croppinglabel.cpp

@@ -34,7 +34,7 @@ CroppingLabel::CroppingLabel(QWidget* parent)
     class LineEdit : public QLineEdit
     {
     public:
-        explicit LineEdit(QWidget* parent = 0)
+        explicit LineEdit(QWidget* parent = nullptr)
             : QLineEdit(parent)
         {
         }

src/widget/tool/croppinglabel.h

@@ -28,7 +28,7 @@ class CroppingLabel : public QLabel
 {
     Q_OBJECT
 public:
-    explicit CroppingLabel(QWidget* parent = 0);
+    explicit CroppingLabel(QWidget* parent = nullptr);
 
 public slots:
     void editBegin();

src/widget/tool/flyoutoverlaywidget.h

@@ -30,7 +30,7 @@ class FlyoutOverlayWidget : public QWidget
     Q_OBJECT
     Q_PROPERTY(qreal flyoutPercent READ flyoutPercent WRITE setFlyoutPercent)
 public:
-    explicit FlyoutOverlayWidget(QWidget* parent = 0);
+    explicit FlyoutOverlayWidget(QWidget* parent = nullptr);
     ~FlyoutOverlayWidget();
 
     int animationDuration() const;

src/widget/tool/profileimporter.h

@@ -27,7 +27,7 @@ class ProfileImporter : public QWidget
     Q_OBJECT
 
 public:
-    explicit ProfileImporter(QWidget* parent = 0);
+    explicit ProfileImporter(QWidget* parent = nullptr);
     bool importProfile(const QString& path);
     bool importProfile();
 

src/widget/tool/screenshotgrabber.cpp

@@ -38,7 +38,7 @@
 ScreenshotGrabber::ScreenshotGrabber()
     : QObject()
     , mKeysBlocked(false)
-    , scene(0)
+    , scene(nullptr)
     , mQToxVisible(true)
 {
     window = new QGraphicsView(scene); // Top-level widget

src/widget/widget.cpp

@@ -699,7 +699,7 @@ void Widget::onSeparateWindowChanged(bool separate, bool clicked)
 
         if (contentLayout) {
             contentLayout->clear();
-            contentLayout->parentWidget()->setParent(0); // Remove from splitter.
+            contentLayout->parentWidget()->setParent(nullptr); // Remove from splitter.
             contentLayout->parentWidget()->hide();
             contentLayout->parentWidget()->deleteLater();
             contentLayout->deleteLater();
@@ -1043,7 +1043,7 @@ void Widget::addFriendFailed(const ToxPk&, const QString& errorInfo)
         info = info + QStringLiteral(": ") + errorInfo;
     }
 
-    QMessageBox::critical(0, "Error", info);
+    QMessageBox::critical(nullptr, "Error", info);
 }
 
 void Widget::onFriendStatusChanged(int friendId, Status status)

src/widget/widget.h

@@ -103,7 +103,7 @@ private:
     };
 
 public:
-    explicit Widget(QWidget* parent = 0);
+    explicit Widget(QWidget* parent = nullptr);
     ~Widget();
     void init();
     void setCentralWidget(QWidget* widget, const QString& widgetName);

test/net/toxmedata_test.cpp

@@ -116,8 +116,8 @@ Q_DECLARE_METATYPE(ToxId)
 void TestToxmeData::lookup_data()
 {
     qRegisterMetaType<ToxId>("ToxId");
-    QTest::addColumn<QString>("input");
-    QTest::addColumn<ToxId>("result");
+    QTest::addColumn<QString>("input", nullptr);
+    QTest::addColumn<ToxId>("result", nullptr);
     QString sToxId = testToxId.toHex();
 
     QTest::newRow("Valid ToxId") << QStringLiteral(R"({"tox_id": "%1"})").arg(sToxId)
@@ -149,8 +149,8 @@ Q_DECLARE_METATYPE(ToxmeData::ExecCode)
 void TestToxmeData::extractCode_data()
 {
     qRegisterMetaType<ToxmeData::ExecCode>("ToxmeData::ExecCode");
-    QTest::addColumn<QString>("input");
-    QTest::addColumn<ToxmeData::ExecCode>("result");
+    QTest::addColumn<QString>("input", nullptr);
+    QTest::addColumn<ToxmeData::ExecCode>("result", nullptr);
 
     QTest::newRow("Custom code") << QStringLiteral(R"({"c": 123})")
                                  << ToxmeData::ExecCode(123);
@@ -205,7 +205,7 @@ void TestToxmeData::createAddressRequest()
     QCOMPARE(bioRes, bio);
 
     int timeRes = json["timestamp"].toInt();
-    // Test will be failed if `createAddressRequest` will take more 
+    // Test will be failed if `createAddressRequest` will take more
     // than 100 seconds
     QVERIFY(qAbs(timeRes - timestamp) < 100);
 }
@@ -216,9 +216,9 @@ void TestToxmeData::createAddressRequest()
 void TestToxmeData::getPassTest_data()
 {
     qRegisterMetaType<ToxmeData::ExecCode>("ToxmeData::ExecCode");
-    QTest::addColumn<QString>("input");
-    QTest::addColumn<QString>("result");
-    QTest::addColumn<ToxmeData::ExecCode>("code");
+    QTest::addColumn<QString>("input", nullptr);
+    QTest::addColumn<QString>("result", nullptr);
+    QTest::addColumn<ToxmeData::ExecCode>("code", nullptr);
 
     QTest::newRow("Valid password") << QStringLiteral(R"({"password": "123qwe"})")
                                     << QStringLiteral("123qwe")
@@ -280,7 +280,7 @@ void TestToxmeData::deleteAddressRequestTest()
     QCOMPARE(pkRes, testPublicKey);
 
     int timeRes = json["timestamp"].toInt();
-    // Test will be failed if `deleteAddressRequest` will take more 
+    // Test will be failed if `deleteAddressRequest` will take more
     // than 100 seconds
     QVERIFY(qAbs(timeRes - timestamp) < 100);
 }

updater/settings.cpp

@@ -38,14 +38,14 @@ Settings::Settings()
     DWORD dwLastErr = 0;
 
     // Enable SeIncreaseQuotaPrivilege
-    HANDLE hProcessToken = NULL;
+    HANDLE hProcessToken = nullptr;
     if (!OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES, &hProcessToken))
         goto unelevateFail;
     TOKEN_PRIVILEGES tkp;
     tkp.PrivilegeCount = 1;
-    LookupPrivilegeValueW(NULL, SE_INCREASE_QUOTA_NAME, &tkp.Privileges[0].Luid);
+    LookupPrivilegeValueW(nullptr, SE_INCREASE_QUOTA_NAME, &tkp.Privileges[0].Luid);
     tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
-    AdjustTokenPrivileges(hProcessToken, FALSE, &tkp, 0, NULL, NULL);
+    AdjustTokenPrivileges(hProcessToken, FALSE, &tkp, 0, nullptr, nullptr);
     dwLastErr = GetLastError();
     CloseHandle(hProcessToken);
     if (ERROR_SUCCESS != dwLastErr)
@@ -68,7 +68,7 @@ Settings::Settings()
     // Duplicate the shell's process token to get a primary token.
     // Based on experimentation, this is the minimal set of rights required for
     // CreateProcessWithTokenW (contrary to current documentation).
-    if (!DuplicateTokenEx(hShellProcessToken, dwTokenRights, NULL, SecurityImpersonation,
+    if (!DuplicateTokenEx(hShellProcessToken, dwTokenRights, nullptr, SecurityImpersonation,
                           TokenPrimary, &hPrimaryToken))
         goto unelevateFail;