Cleanup Widgets examples - nullptr

Cleanup the widgets examples - replace 0 with nullptr Change-Id: Id4bf119b9a41f6d10117f3a613a6e604128fa196 Reviewed-by: Konstantin Shegunov <kshegunov@gmail.com> Reviewed-by: Edward Welbourne <edward.welbourne@qt.io> Reviewed-by: Paul Wicking <paul.wicking@qt.io>
2018-12-02 14:11:13 +01:00 · 2018-12-02 14:11:13 +01:00 · aa32510430
commit aa32510430
parent c590aa678d
54 changed files with 91 additions and 90 deletions
--- a/examples/widgets/animation/animatedtiles/main.cpp
+++ b/examples/widgets/animation/animatedtiles/main.cpp
@ -69,7 +69,7 @@ class Button : public QGraphicsWidget
 {
    Q_OBJECT
 public:
-    Button(const QPixmap &pixmap, QGraphicsItem *parent = 0)
+    Button(const QPixmap &pixmap, QGraphicsItem *parent = nullptr)
        : QGraphicsWidget(parent), _pix(pixmap)
    {
        setAcceptHoverEvents(true);
--- a/examples/widgets/animation/easing/window.h
+++ b/examples/widgets/animation/easing/window.h
@ -66,7 +66,7 @@ public:
 class Window : public QWidget {
    Q_OBJECT
 public:
-    Window(QWidget *parent = 0);
+    Window(QWidget *parent = nullptr);
 private slots:
    void curveChanged(int row);
    void pathChanged(int index);
--- a/examples/widgets/animation/moveblocks/main.cpp
+++ b/examples/widgets/animation/moveblocks/main.cpp
@ -169,7 +169,8 @@ class GraphicsView : public QGraphicsView
 {
    Q_OBJECT
 public:
-    GraphicsView(QGraphicsScene *scene, QWidget *parent = NULL) : QGraphicsView(scene, parent)
+    GraphicsView(QGraphicsScene *scene, QWidget *parent = nullptr)
+        : QGraphicsView(scene, parent)
    {
    }

--- a/examples/widgets/animation/stickman/graphicsview.cpp
+++ b/examples/widgets/animation/stickman/graphicsview.cpp
@ -55,7 +55,9 @@
 #include <QtWidgets/QGraphicsScene>
 #include <QtWidgets/QGraphicsView>

-GraphicsView::GraphicsView(QWidget *parent) : QGraphicsView(parent), m_editor(0) {}
+GraphicsView::GraphicsView(QWidget *parent)
+    : QGraphicsView(parent), m_editor(nullptr)
+{}

 void GraphicsView::keyPressEvent(QKeyEvent *e)
 {
--- a/examples/widgets/animation/stickman/graphicsview.h
+++ b/examples/widgets/animation/stickman/graphicsview.h
@ -58,7 +58,7 @@ class GraphicsView: public QGraphicsView
 {
    Q_OBJECT
 public:
-    GraphicsView(QWidget *parent = 0);
+    GraphicsView(QWidget *parent = nullptr);

 protected:
    void resizeEvent(QResizeEvent *event) override;
--- a/examples/widgets/animation/stickman/lifecycle.cpp
+++ b/examples/widgets/animation/stickman/lifecycle.cpp
@ -175,9 +175,8 @@ void LifeCycle::addActivity(const QString &fileName, Qt::Key key, QObject *sende
    QState *state = makeState(m_alive, fileName);
    m_alive->addTransition(new KeyPressTransition(m_keyReceiver, key, state));

-    if((sender != NULL) || (signal != NULL)) {
+    if (sender || signal)
        m_alive->addTransition(sender, signal, state);
-    }
 }

 QState *LifeCycle::makeState(QState *parentState, const QString &animationFileName)
@ -192,7 +191,7 @@ QState *LifeCycle::makeState(QState *parentState, const QString &animationFileNa
    }

    const int frameCount = animation.totalFrames();
-    QState *previousState = 0;
+    QState *previousState = nullptr;
    for (int i=0; i<frameCount; ++i) {
        animation.setCurrentFrame(i);

@ -204,7 +203,7 @@ QState *LifeCycle::makeState(QState *parentState, const QString &animationFileNa
 //! [1]

        frameState->setObjectName(QString::fromLatin1("frame %0").arg(i));
-        if (previousState == 0)
+        if (previousState == nullptr)
            topLevel->setInitialState(frameState);
        else
 //! [2]
--- a/examples/widgets/animation/stickman/stickman.cpp
+++ b/examples/widgets/animation/stickman/stickman.cpp
@ -176,8 +176,7 @@ Node *StickMan::node(int idx) const
 {
    if (idx >= 0 && idx < NodeCount)
        return m_nodes[idx];
-    else
-        return 0;
+    return nullptr;
 }

 void StickMan::timerEvent(QTimerEvent *)
--- a/examples/widgets/animation/sub-attaq/animationmanager.cpp
+++ b/examples/widgets/animation/sub-attaq/animationmanager.cpp
@ -56,7 +56,7 @@
 #include <QtCore/QDebug>

 // the universe's only animation manager
-AnimationManager *AnimationManager::instance = 0;
+AnimationManager *AnimationManager::instance = nullptr;

 AnimationManager::AnimationManager()
 {
--- a/examples/widgets/animation/sub-attaq/boat.cpp
+++ b/examples/widgets/animation/sub-attaq/boat.cpp
@ -92,8 +92,9 @@ static QAbstractAnimation *setupDestroyAnimation(Boat *boat)



-Boat::Boat() : PixmapItem(QString("boat"), GraphicsScene::Big),
-    speed(0), bombsAlreadyLaunched(0), direction(Boat::None), movementAnimation(0)
+Boat::Boat()
+    : PixmapItem(QString("boat"), GraphicsScene::Big),
+      speed(0), bombsAlreadyLaunched(0), direction(Boat::None)
 {
    setZValue(4);
    setFlags(QGraphicsItem::ItemIsFocusable);
--- a/examples/widgets/animation/sub-attaq/boat_p.h
+++ b/examples/widgets/animation/sub-attaq/boat_p.h
@ -146,7 +146,8 @@ private:
 class MoveStateRight : public QState
 {
 public:
-    explicit MoveStateRight(Boat *boat,QState *parent = 0) : QState(parent), boat(boat)
+    explicit MoveStateRight(Boat *boat, QState *parent = nullptr)
+        : QState(parent), boat(boat)
    {
    }
 protected:
@ -163,7 +164,8 @@ private:
 class MoveStateLeft : public QState
 {
 public:
-    explicit MoveStateLeft(Boat *boat,QState *parent = 0) : QState(parent), boat(boat)
+    explicit MoveStateLeft(Boat *boat, QState *parent = nullptr)
+        : QState(parent), boat(boat)
    {
    }
 protected:
@ -180,7 +182,8 @@ private:
 class StopState : public QState
 {
 public:
-    explicit StopState(Boat *boat,QState *parent = 0) : QState(parent), boat(boat)
+    explicit StopState(Boat *boat, QState *parent = nullptr)
+        : QState(parent), boat(boat)
    {
    }
 protected:
@ -198,13 +201,14 @@ private:
 class LaunchStateRight : public QState
 {
 public:
-    explicit LaunchStateRight(Boat *boat,QState *parent = 0) : QState(parent), boat(boat)
+    explicit LaunchStateRight(Boat *boat, QState *parent = nullptr)
+        : QState(parent), boat(boat)
    {
    }
 protected:
    void onEntry(QEvent *) override
    {
-        Bomb *b = new Bomb();
+        Bomb *b = new Bomb;
        b->setPos(boat->x()+boat->size().width(),boat->y());
        GraphicsScene *scene = static_cast<GraphicsScene *>(boat->scene());
        scene->addItem(b);
@ -219,13 +223,14 @@ private:
 class LaunchStateLeft : public QState
 {
 public:
-    explicit LaunchStateLeft(Boat *boat,QState *parent = 0) : QState(parent), boat(boat)
+    explicit LaunchStateLeft(Boat *boat, QState *parent = nullptr)
+        : QState(parent), boat(boat)
    {
    }
 protected:
    void onEntry(QEvent *) override
    {
-        Bomb *b = new Bomb();
+        Bomb *b = new Bomb;
        b->setPos(boat->x() - b->size().width(), boat->y());
        GraphicsScene *scene = static_cast<GraphicsScene *>(boat->scene());
        scene->addItem(b);
--- a/examples/widgets/animation/sub-attaq/mainwindow.cpp
+++ b/examples/widgets/animation/sub-attaq/mainwindow.cpp
@ -63,7 +63,8 @@
 # include <QtOpenGL/QtOpenGL>
 #endif

-MainWindow::MainWindow() : QMainWindow(0)
+MainWindow::MainWindow(QWidget *parent)
+    : QMainWindow(parent)
 {
    QMenu *file = menuBar()->addMenu(tr("&File"));

--- a/examples/widgets/animation/sub-attaq/mainwindow.h
+++ b/examples/widgets/animation/sub-attaq/mainwindow.h
@ -62,7 +62,7 @@ class MainWindow : public QMainWindow
 {
 Q_OBJECT
 public:
-    MainWindow();
+    MainWindow(QWidget *parent = nullptr);

 private:
    GraphicsScene *scene;
--- a/examples/widgets/animation/sub-attaq/pixmapitem.cpp
+++ b/examples/widgets/animation/sub-attaq/pixmapitem.cpp
@ -54,7 +54,8 @@
 //Qt
 #include <QPainter>

-PixmapItem::PixmapItem(const QString &fileName,GraphicsScene::Mode mode, QGraphicsItem * parent) : QGraphicsObject(parent)
+PixmapItem::PixmapItem(const QString &fileName,GraphicsScene::Mode mode, QGraphicsItem * parent)
+    : QGraphicsObject(parent)
 {
    if (mode == GraphicsScene::Big)
        pix  = QPixmap(QStringLiteral(":/big/") + fileName);
--- a/examples/widgets/animation/sub-attaq/pixmapitem.h
+++ b/examples/widgets/animation/sub-attaq/pixmapitem.h
@ -60,7 +60,7 @@
 class PixmapItem : public QGraphicsObject
 {
 public:
-    PixmapItem(const QString &fileName, GraphicsScene::Mode mode, QGraphicsItem * parent = 0);
+    PixmapItem(const QString &fileName, GraphicsScene::Mode mode, QGraphicsItem *parent = nullptr);
    PixmapItem(const QString &fileName, QGraphicsScene *scene);
    QSizeF size() const;
    QRectF boundingRect() const override;
--- a/examples/widgets/animation/sub-attaq/qanimationstate.cpp
+++ b/examples/widgets/animation/sub-attaq/qanimationstate.cpp
@ -84,7 +84,7 @@ machine.start();
  Constructs a new state with the given \a parent state.
 */
 QAnimationState::QAnimationState(QState *parent)
-    : QState(parent), m_animation(0)
+    : QState(parent), m_animation(nullptr)
 {
 }

--- a/examples/widgets/animation/sub-attaq/states.cpp
+++ b/examples/widgets/animation/sub-attaq/states.cpp
@ -67,11 +67,8 @@
 #include <QtCore/QRandomGenerator>

 PlayState::PlayState(GraphicsScene *scene, QState *parent)
-    : QState(parent),
-    scene(scene),
-    machine(0),
-    currentLevel(0),
-    score(0)
+    : QState(parent), scene(scene), machine(nullptr),
+      currentLevel(0), score(0)
 {
 }

--- a/examples/widgets/desktop/systray/main.cpp
+++ b/examples/widgets/desktop/systray/main.cpp
@ -62,7 +62,7 @@ int main(int argc, char *argv[])
    QApplication app(argc, argv);

    if (!QSystemTrayIcon::isSystemTrayAvailable()) {
-        QMessageBox::critical(0, QObject::tr("Systray"),
+        QMessageBox::critical(nullptr, QObject::tr("Systray"),
                              QObject::tr("I couldn't detect any system tray "
                                          "on this system."));
        return 1;
--- a/examples/widgets/desktop/systray/window.cpp
+++ b/examples/widgets/desktop/systray/window.cpp
@ -176,7 +176,7 @@ void Window::showMessage()
 //! [6]
 void Window::messageClicked()
 {
-    QMessageBox::information(0, tr("Systray"),
+    QMessageBox::information(nullptr, tr("Systray"),
                             tr("Sorry, I already gave what help I could.\n"
                                "Maybe you should try asking a human?"));
 }
--- a/examples/widgets/dialogs/classwizard/classwizard.cpp
+++ b/examples/widgets/dialogs/classwizard/classwizard.cpp
@ -139,7 +139,7 @@ void ClassWizard::accept()

    QFile headerFile(outputDir + '/' + header);
    if (!headerFile.open(QFile::WriteOnly | QFile::Text)) {
-        QMessageBox::warning(0, QObject::tr("Simple Wizard"),
+        QMessageBox::warning(nullptr, QObject::tr("Simple Wizard"),
                             QObject::tr("Cannot write file %1:\n%2")
                             .arg(headerFile.fileName())
                             .arg(headerFile.errorString()));
@ -195,7 +195,7 @@ void ClassWizard::accept()

    QFile implementationFile(outputDir + '/' + implementation);
    if (!implementationFile.open(QFile::WriteOnly | QFile::Text)) {
-        QMessageBox::warning(0, QObject::tr("Simple Wizard"),
+        QMessageBox::warning(nullptr, QObject::tr("Simple Wizard"),
                             QObject::tr("Cannot write file %1:\n%2")
                             .arg(implementationFile.fileName())
                             .arg(implementationFile.errorString()));
--- a/examples/widgets/dialogs/findfiles/window.cpp
+++ b/examples/widgets/dialogs/findfiles/window.cpp
@ -182,7 +182,7 @@ QStringList Window::findFiles(const QStringList &files, const QString &text)

    for (int i = 0; i < files.size(); ++i) {
        progressDialog.setValue(i);
-        progressDialog.setLabelText(tr("Searching file number %1 of %n...", 0, files.size()).arg(i));
+        progressDialog.setLabelText(tr("Searching file number %1 of %n...", nullptr, files.size()).arg(i));
        QCoreApplication::processEvents();
 //! [6]

@ -237,7 +237,7 @@ void Window::showFiles(const QStringList &paths)
        filesTable->setItem(row, 0, fileNameItem);
        filesTable->setItem(row, 1, sizeItem);
    }
-    filesFoundLabel->setText(tr("%n file(s) found (Double click on a file to open it)", 0, paths.size()));
+    filesFoundLabel->setText(tr("%n file(s) found (Double click on a file to open it)", nullptr, paths.size()));
    filesFoundLabel->setWordWrap(true);
 }
 //! [8]
--- a/examples/widgets/dialogs/standarddialogs/dialog.cpp
+++ b/examples/widgets/dialogs/standarddialogs/dialog.cpp
@ -65,7 +65,7 @@
 class DialogOptionsWidget : public QGroupBox
 {
 public:
-    explicit DialogOptionsWidget(QWidget *parent = 0);
+    explicit DialogOptionsWidget(QWidget *parent = nullptr);

    void addCheckBox(const QString &text, int value);
    void addSpacer();
@ -492,7 +492,7 @@ void Dialog::questionMessage()
 void Dialog::warningMessage()
 {
    QMessageBox msgBox(QMessageBox::Warning, tr("QMessageBox::warning()"),
-                       MESSAGE, 0, this);
+                       MESSAGE, nullptr, this);
    msgBox.setDetailedText(MESSAGE_DETAILS);
    msgBox.addButton(tr("Save &Again"), QMessageBox::AcceptRole);
    msgBox.addButton(tr("&Continue"), QMessageBox::RejectRole);
--- a/examples/widgets/graphicsview/embeddeddialogs/customproxy.cpp
+++ b/examples/widgets/graphicsview/embeddeddialogs/customproxy.cpp
@ -55,7 +55,7 @@
 #include <QGraphicsScene>

 CustomProxy::CustomProxy(QGraphicsItem *parent, Qt::WindowFlags wFlags)
-    : QGraphicsProxyWidget(parent, wFlags), popupShown(false), currentPopup(0)
+    : QGraphicsProxyWidget(parent, wFlags), popupShown(false), currentPopup(nullptr)
 {
    timeLine = new QTimeLine(250, this);
    connect(timeLine, &QTimeLine::valueChanged,
@ -133,7 +133,7 @@ QVariant CustomProxy::itemChange(GraphicsItemChange change, const QVariant &valu
                currentPopup->installSceneEventFilter(this);
        } else if (scene()) {
            currentPopup->removeSceneEventFilter(this);
-            currentPopup = 0;
+            currentPopup = nullptr;
        }
    } else if (currentPopup && change == ItemSceneHasChanged) {
        currentPopup->installSceneEventFilter(this);
--- a/examples/widgets/graphicsview/embeddeddialogs/main.cpp
+++ b/examples/widgets/graphicsview/embeddeddialogs/main.cpp
@ -66,7 +66,7 @@ int main(int argc, char *argv[])

    for (int y = 0; y < gridSize; ++y) {
        for (int x = 0; x < gridSize; ++x) {
-            CustomProxy *proxy = new CustomProxy(0, Qt::Window);
+            CustomProxy *proxy = new CustomProxy(nullptr, Qt::Window);
            proxy->setWidget(new EmbeddedDialog);

            QRectF rect = proxy->boundingRect();
--- a/examples/widgets/layouts/borderlayout/borderlayout.cpp
+++ b/examples/widgets/layouts/borderlayout/borderlayout.cpp
@ -98,10 +98,7 @@ int BorderLayout::count() const
 QLayoutItem *BorderLayout::itemAt(int index) const
 {
    ItemWrapper *wrapper = list.value(index);
-    if (wrapper)
-        return wrapper->item;
-    else
-        return 0;
+    return wrapper ? wrapper->item : nullptr;
 }

 QSize BorderLayout::minimumSize() const
@ -111,7 +108,7 @@ QSize BorderLayout::minimumSize() const

 void BorderLayout::setGeometry(const QRect &rect)
 {
-    ItemWrapper *center = 0;
+    ItemWrapper *center = nullptr;
    int eastWidth = 0;
    int westWidth = 0;
    int northHeight = 0;
@ -189,7 +186,7 @@ QLayoutItem *BorderLayout::takeAt(int index)
        ItemWrapper *layoutStruct = list.takeAt(index);
        return layoutStruct->item;
    }
-    return 0;
+    return nullptr;
 }

 void BorderLayout::add(QLayoutItem *item, Position position)
--- a/examples/widgets/layouts/flowlayout/flowlayout.cpp
+++ b/examples/widgets/layouts/flowlayout/flowlayout.cpp
@ -116,8 +116,7 @@ QLayoutItem *FlowLayout::takeAt(int index)
 {
    if (index >= 0 && index < itemList.size())
        return itemList.takeAt(index);
-    else
-        return 0;
+    return nullptr;
 }
 //! [5]

@ -215,7 +214,7 @@ 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();
    }
--- a/examples/widgets/mainwindows/mainwindow/colorswatch.cpp
+++ b/examples/widgets/mainwindows/mainwindow/colorswatch.cpp
@ -584,7 +584,7 @@ void ColorSwatch::changeVerticalTitleBar(bool on)
 QSize BlueTitleBar::minimumSizeHint() const
 {
    QDockWidget *dw = qobject_cast<QDockWidget*>(parentWidget());
-    Q_ASSERT(dw != 0);
+    Q_ASSERT(dw);
    QSize result(leftPm.width() + rightPm.width(), centerPm.height());
    if (dw->features() & QDockWidget::DockWidgetVerticalTitleBar)
        result.transpose();
@ -605,7 +605,7 @@ void BlueTitleBar::paintEvent(QPaintEvent*)
    QRect rect = this->rect();

    QDockWidget *dw = qobject_cast<QDockWidget*>(parentWidget());
-    Q_ASSERT(dw != 0);
+    Q_ASSERT(dw);

    if (dw->features() & QDockWidget::DockWidgetVerticalTitleBar) {
        QSize s = rect.size();
@ -632,7 +632,7 @@ void BlueTitleBar::mouseReleaseEvent(QMouseEvent *event)
    QRect rect = this->rect();

    QDockWidget *dw = qobject_cast<QDockWidget*>(parentWidget());
-    Q_ASSERT(dw != 0);
+    Q_ASSERT(dw);

    if (dw->features() & QDockWidget::DockWidgetVerticalTitleBar) {
        QPoint p = pos;
@ -676,7 +676,7 @@ void BlueTitleBar::mouseReleaseEvent(QMouseEvent *event)
 void BlueTitleBar::updateMask()
 {
    QDockWidget *dw = qobject_cast<QDockWidget*>(parent());
-    Q_ASSERT(dw != 0);
+    Q_ASSERT(dw);

    QRect rect = dw->rect();
    QPixmap bitmap(dw->size());
--- a/examples/widgets/mainwindows/mainwindow/toolbar.cpp
+++ b/examples/widgets/mainwindows/mainwindow/toolbar.cpp
@ -208,7 +208,7 @@ ToolBar::ToolBar(const QString &title, QWidget *parent)
 void ToolBar::updateMenu()
 {
    QMainWindow *mainWindow = qobject_cast<QMainWindow *>(parentWidget());
-    Q_ASSERT(mainWindow != 0);
+    Q_ASSERT(mainWindow);

    const Qt::ToolBarArea area = mainWindow->toolBarArea(this);
    const Qt::ToolBarAreas areas = allowedAreas();
@ -313,7 +313,7 @@ void ToolBar::place(Qt::ToolBarArea area, bool p)
        return;

    QMainWindow *mainWindow = qobject_cast<QMainWindow *>(parentWidget());
-    Q_ASSERT(mainWindow != 0);
+    Q_ASSERT(mainWindow);

    mainWindow->addToolBar(area, this);

@ -355,7 +355,7 @@ void ToolBar::placeBottom(bool p)
 void ToolBar::insertToolBarBreak()
 {
    QMainWindow *mainWindow = qobject_cast<QMainWindow *>(parentWidget());
-    Q_ASSERT(mainWindow != 0);
+    Q_ASSERT(mainWindow);

    mainWindow->insertToolBarBreak(this);
 }
--- a/examples/widgets/mainwindows/mdi/mainwindow.cpp
+++ b/examples/widgets/mainwindows/mdi/mainwindow.cpp
@ -242,7 +242,7 @@ void MainWindow::about()

 void MainWindow::updateMenus()
 {
-    bool hasMdiChild = (activeMdiChild() != 0);
+    bool hasMdiChild = (activeMdiChild() != nullptr);
    saveAct->setEnabled(hasMdiChild);
    saveAsAct->setEnabled(hasMdiChild);
 #ifndef QT_NO_CLIPBOARD
@ -483,7 +483,7 @@ MdiChild *MainWindow::activeMdiChild() const
 {
    if (QMdiSubWindow *activeSubWindow = mdiArea->activeSubWindow())
        return qobject_cast<MdiChild *>(activeSubWindow->widget());
-    return 0;
+    return nullptr;
 }

 QMdiSubWindow *MainWindow::findMdiChild(const QString &fileName) const
@ -495,7 +495,7 @@ QMdiSubWindow *MainWindow::findMdiChild(const QString &fileName) const
        if (mdiChild->currentFile() == canonicalFilePath)
            return window;
    }
-    return 0;
+    return nullptr;
 }

 void MainWindow::switchLayoutDirection()
--- a/examples/widgets/mainwindows/sdi/mainwindow.cpp
+++ b/examples/widgets/mainwindows/sdi/mainwindow.cpp
@ -478,5 +478,5 @@ MainWindow *MainWindow::findMainWindow(const QString &fileName) const
            return mainWin;
    }

-    return 0;
+    return nullptr;
 }
--- a/examples/widgets/widgets/analogclock/analogclock.h
+++ b/examples/widgets/widgets/analogclock/analogclock.h
@ -59,7 +59,7 @@ class AnalogClock : public QWidget
    Q_OBJECT

 public:
-    AnalogClock(QWidget *parent = 0);
+    AnalogClock(QWidget *parent = nullptr);

 protected:
    void paintEvent(QPaintEvent *event) override;
--- a/examples/widgets/widgets/calculator/button.h
+++ b/examples/widgets/widgets/calculator/button.h
@ -59,7 +59,7 @@ class Button : public QToolButton
    Q_OBJECT

 public:
-    explicit Button(const QString &text, QWidget *parent = 0);
+    explicit Button(const QString &text, QWidget *parent = nullptr);

    QSize sizeHint() const override;
 };
--- a/examples/widgets/widgets/calculator/calculator.h
+++ b/examples/widgets/widgets/calculator/calculator.h
@ -64,7 +64,7 @@ class Calculator : public QWidget
    Q_OBJECT

 public:
-    Calculator(QWidget *parent = 0);
+    Calculator(QWidget *parent = nullptr);

 private slots:
    void digitClicked();
--- a/examples/widgets/widgets/charactermap/characterwidget.h
+++ b/examples/widgets/widgets/charactermap/characterwidget.h
@ -68,7 +68,7 @@ class CharacterWidget : public QWidget
    Q_OBJECT

 public:
-    CharacterWidget(QWidget *parent = 0);
+    CharacterWidget(QWidget *parent = nullptr);
    QSize sizeHint() const override;

 public slots:
--- a/examples/widgets/widgets/charactermap/mainwindow.cpp
+++ b/examples/widgets/widgets/charactermap/mainwindow.cpp
@ -188,7 +188,7 @@ void MainWindow::filterChanged(int f)
    const QFontComboBox::FontFilter filter =
        filterCombo->itemData(f).value<QFontComboBox::FontFilter>();
    fontCombo->setFontFilters(filter);
-    statusBar()->showMessage(tr("%n font(s) found", 0, fontCombo->count()));
+    statusBar()->showMessage(tr("%n font(s) found", nullptr, fontCombo->count()));
 }

 void MainWindow::findSizes(const QFont &font)
--- a/examples/widgets/widgets/codeeditor/codeeditor.h
+++ b/examples/widgets/widgets/codeeditor/codeeditor.h
@ -70,7 +70,7 @@ class CodeEditor : public QPlainTextEdit
    Q_OBJECT

 public:
-    CodeEditor(QWidget *parent = 0);
+    CodeEditor(QWidget *parent = nullptr);

    void lineNumberAreaPaintEvent(QPaintEvent *event);
    int lineNumberAreaWidth();
--- a/examples/widgets/widgets/digitalclock/digitalclock.h
+++ b/examples/widgets/widgets/digitalclock/digitalclock.h
@ -59,7 +59,7 @@ class DigitalClock : public QLCDNumber
    Q_OBJECT

 public:
-    DigitalClock(QWidget *parent = 0);
+    DigitalClock(QWidget *parent = nullptr);

 private slots:
    void showTime();
--- a/examples/widgets/widgets/elidedlabel/elidedlabel.h
+++ b/examples/widgets/widgets/elidedlabel/elidedlabel.h
@ -65,7 +65,7 @@ class ElidedLabel : public QFrame
    Q_PROPERTY(bool isElided READ isElided)

 public:
-    explicit ElidedLabel(const QString &text, QWidget *parent = 0);
+    explicit ElidedLabel(const QString &text, QWidget *parent = nullptr);

    void setText(const QString &text);
    const QString & text() const { return content; }
--- a/examples/widgets/widgets/elidedlabel/testwidget.h
+++ b/examples/widgets/widgets/elidedlabel/testwidget.h
@ -64,7 +64,7 @@ class TestWidget : public QWidget
    Q_OBJECT

 public:
-    TestWidget(QWidget *parent = 0);
+    TestWidget(QWidget *parent = nullptr);

 protected:
    void resizeEvent(QResizeEvent *event) override;
--- a/examples/widgets/widgets/groupbox/window.h
+++ b/examples/widgets/widgets/groupbox/window.h
@ -63,7 +63,7 @@ class Window : public QWidget
    Q_OBJECT

 public:
-    Window(QWidget *parent = 0);
+    Window(QWidget *parent = nullptr);

 private:
    QGroupBox *createFirstExclusiveGroup();
--- a/examples/widgets/widgets/lineedits/window.cpp
+++ b/examples/widgets/widgets/lineedits/window.cpp
@ -206,7 +206,7 @@ void Window::validatorChanged(int index)
 {
    switch (index) {
    case 0:
-        validatorLineEdit->setValidator(0);
+        validatorLineEdit->setValidator(nullptr);
        break;
    case 1:
        validatorLineEdit->setValidator(new QIntValidator(
--- a/examples/widgets/widgets/movie/movieplayer.h
+++ b/examples/widgets/widgets/movie/movieplayer.h
@ -70,7 +70,7 @@ class MoviePlayer : public QWidget
    Q_OBJECT

 public:
-    MoviePlayer(QWidget *parent = 0);
+    MoviePlayer(QWidget *parent = nullptr);
    void openFile(const QString &fileName);

 private slots:
--- a/examples/widgets/widgets/scribble/scribblearea.h
+++ b/examples/widgets/widgets/scribble/scribblearea.h
@ -62,7 +62,7 @@ class ScribbleArea : public QWidget
    Q_OBJECT

 public:
-    ScribbleArea(QWidget *parent = 0);
+    ScribbleArea(QWidget *parent = nullptr);

    bool openImage(const QString &fileName);
    bool saveImage(const QString &fileName, const char *fileFormat);
--- a/examples/widgets/widgets/shapedclock/shapedclock.h
+++ b/examples/widgets/widgets/shapedclock/shapedclock.h
@ -59,7 +59,7 @@ class ShapedClock : public QWidget
    Q_OBJECT

 public:
-    ShapedClock(QWidget *parent = 0);
+    ShapedClock(QWidget *parent = nullptr);
    QSize sizeHint() const override;

 protected:
--- a/examples/widgets/widgets/sliders/slidersgroup.h
+++ b/examples/widgets/widgets/sliders/slidersgroup.h
@ -66,7 +66,7 @@ class SlidersGroup : public QGroupBox

 public:
    SlidersGroup(Qt::Orientation orientation, const QString &title,
-                 QWidget *parent = 0);
+                 QWidget *parent = nullptr);

 signals:
    void valueChanged(int value);
--- a/examples/widgets/widgets/styles/widgetgallery.h
+++ b/examples/widgets/widgets/styles/widgetgallery.h
@ -78,7 +78,7 @@ class WidgetGallery : public QDialog
    Q_OBJECT

 public:
-    WidgetGallery(QWidget *parent = 0);
+    WidgetGallery(QWidget *parent = nullptr);

 private slots:
    void changeStyle(const QString &styleName);
--- a/examples/widgets/widgets/stylesheet/stylesheeteditor.h
+++ b/examples/widgets/widgets/stylesheet/stylesheeteditor.h
@ -60,7 +60,7 @@ class StyleSheetEditor : public QDialog
    Q_OBJECT

 public:
-    StyleSheetEditor(QWidget *parent = 0);
+    StyleSheetEditor(QWidget *parent = nullptr);

 private slots:
    void on_styleCombo_activated(const QString &styleName);
--- a/examples/widgets/widgets/tablet/tabletapplication.h
+++ b/examples/widgets/widgets/tablet/tabletapplication.h
@ -61,15 +61,14 @@ class TabletApplication : public QApplication
    Q_OBJECT

 public:
-    TabletApplication(int &argv, char **args)
-    : QApplication(argv, args) {}
+    using QApplication::QApplication;

    bool event(QEvent *event) override;
    void setCanvas(TabletCanvas *canvas)
        { m_canvas = canvas; }

 private:
-    TabletCanvas *m_canvas;
+    TabletCanvas *m_canvas = nullptr;
 };
 //! [0]

--- a/examples/widgets/widgets/tetrix/tetrixboard.h
+++ b/examples/widgets/widgets/tetrix/tetrixboard.h
@ -67,7 +67,7 @@ class TetrixBoard : public QFrame
    Q_OBJECT

 public:
-    TetrixBoard(QWidget *parent = 0);
+    TetrixBoard(QWidget *parent = nullptr);

    void setNextPieceLabel(QLabel *label);
    QSize sizeHint() const override;
--- a/examples/widgets/widgets/tooltips/sortingbox.cpp
+++ b/examples/widgets/widgets/tooltips/sortingbox.cpp
@ -64,7 +64,7 @@ SortingBox::SortingBox(QWidget *parent)
    setBackgroundRole(QPalette::Base);
 //! [2]

-    itemInMotion = 0;
+    itemInMotion = nullptr;

 //! [3]
    newCircleButton = createToolButton(tr("New Circle"),
@ -179,7 +179,7 @@ void SortingBox::mouseReleaseEvent(QMouseEvent *event)
 {
    if (event->button() == Qt::LeftButton && itemInMotion) {
        moveItemTo(event->pos());
-        itemInMotion = 0;
+        itemInMotion = nullptr;
    }
 }
 //! [13]
--- a/examples/widgets/widgets/validators/ledwidget.h
+++ b/examples/widgets/widgets/validators/ledwidget.h
@ -59,7 +59,7 @@ class LEDWidget : public QLabel
 {
    Q_OBJECT
 public:
-    LEDWidget(QWidget *parent = 0);
+    LEDWidget(QWidget *parent = nullptr);
 public slots:
    void flash();

--- a/examples/widgets/widgets/validators/localeselector.h
+++ b/examples/widgets/widgets/validators/localeselector.h
@ -58,7 +58,7 @@ class LocaleSelector : public QComboBox
    Q_OBJECT

 public:
-    LocaleSelector(QWidget *parent = 0);
+    LocaleSelector(QWidget *parent = nullptr);

 signals:
    void localeSelected(const QLocale &locale);
--- a/examples/widgets/widgets/wiggly/dialog.h
+++ b/examples/widgets/widgets/wiggly/dialog.h
@ -59,7 +59,7 @@ class Dialog : public QDialog
    Q_OBJECT

 public:
-    explicit Dialog(QWidget *parent = 0);
+    explicit Dialog(QWidget *parent = nullptr);
 };
 //! [0]

--- a/examples/widgets/widgets/wiggly/wigglywidget.h
+++ b/examples/widgets/widgets/wiggly/wigglywidget.h
@ -60,7 +60,7 @@ class WigglyWidget : public QWidget
    Q_OBJECT

 public:
-    WigglyWidget(QWidget *parent = 0);
+    WigglyWidget(QWidget *parent = nullptr);

 public slots:
    void setText(const QString &newText) { text = newText; }
--- a/examples/widgets/widgets/windowflags/previewwindow.h
+++ b/examples/widgets/widgets/windowflags/previewwindow.h
@ -64,7 +64,7 @@ class PreviewWindow : public QWidget
    Q_OBJECT

 public:
-    PreviewWindow(QWidget *parent = 0);
+    PreviewWindow(QWidget *parent = nullptr);

    void setWindowFlags(Qt::WindowFlags flags);