Cleanup Widgets examples - signals/slots

Cleanup the widgets examples - use new signal/slot syntax where possible

Change-Id: I6bc8953534d8b1efca0de4ee6a9fe4a6aa79fda9
Reviewed-by: Samuel Gaist <samuel.gaist@idiap.ch>
Reviewed-by: Konstantin Shegunov <kshegunov@gmail.com>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Paul Wicking <paul.wicking@qt.io>

17 files changed, 134 insertions, 130 deletions

diff --git a/examples/widgets/widgets/analogclock/analogclock.cpp b/examples/widgets/widgets/analogclock/analogclock.cpp
index 0dc2fbc708..bee316b9b7 100644
--- a/examples/widgets/widgets/analogclock/analogclock.cpp
+++ b/examples/widgets/widgets/analogclock/analogclock.cpp
@@ -61,7 +61,7 @@ AnalogClock::AnalogClock(QWidget *parent)
 //! [3] //! [4]
     QTimer *timer = new QTimer(this);
 //! [4] //! [5]
-    connect(timer, SIGNAL(timeout()), this, SLOT(update()));
+    connect(timer, &QTimer::timeout, this, QOverload<>::of(&AnalogClock::update));
 //! [5] //! [6]
     timer->start(1000);
 //! [6]
diff --git a/examples/widgets/widgets/calendarwidget/window.cpp b/examples/widgets/widgets/calendarwidget/window.cpp
index a1c1746786..64047aaac9 100644
--- a/examples/widgets/widgets/calendarwidget/window.cpp
+++ b/examples/widgets/widgets/calendarwidget/window.cpp
@@ -221,8 +221,8 @@ void Window::createPreviewGroupBox()
     calendar->setMaximumDate(QDate(3000, 1, 1));
     calendar->setGridVisible(true);
 
-    connect(calendar, SIGNAL(currentPageChanged(int,int)),
-            this, SLOT(reformatCalendarPage()));
+    connect(calendar, &QCalendarWidget::currentPageChanged,
+            this, &Window::reformatCalendarPage);
 
     previewLayout = new QGridLayout;
     previewLayout->addWidget(calendar, 0, 0, Qt::AlignCenter);
@@ -306,20 +306,20 @@ void Window::createGeneralOptionsGroupBox()
     verticalHeaderLabel->setBuddy(verticalHeaderCombo);
 
 //! [11]
-    connect(localeCombo, SIGNAL(currentIndexChanged(int)),
-            this, SLOT(localeChanged(int)));
-    connect(firstDayCombo, SIGNAL(currentIndexChanged(int)),
-            this, SLOT(firstDayChanged(int)));
-    connect(selectionModeCombo, SIGNAL(currentIndexChanged(int)),
-            this, SLOT(selectionModeChanged(int)));
-    connect(gridCheckBox, SIGNAL(toggled(bool)),
-            calendar, SLOT(setGridVisible(bool)));
-    connect(navigationCheckBox, SIGNAL(toggled(bool)),
-            calendar, SLOT(setNavigationBarVisible(bool)));
-    connect(horizontalHeaderCombo, SIGNAL(currentIndexChanged(int)),
-            this, SLOT(horizontalHeaderChanged(int)));
-    connect(verticalHeaderCombo, SIGNAL(currentIndexChanged(int)),
-            this, SLOT(verticalHeaderChanged(int)));
+    connect(localeCombo, QOverload<int>::of(&QComboBox::currentIndexChanged),
+            this, &Window::localeChanged);
+    connect(firstDayCombo, QOverload<int>::of(&QComboBox::currentIndexChanged),
+            this, &Window::firstDayChanged);
+    connect(selectionModeCombo, QOverload<int>::of(&QComboBox::currentIndexChanged),
+            this, &Window::selectionModeChanged);
+    connect(gridCheckBox, &QCheckBox::toggled,
+            calendar, &QCalendarWidget::setGridVisible);
+    connect(navigationCheckBox, &QCheckBox::toggled,
+            calendar, &QCalendarWidget::setNavigationBarVisible);
+    connect(horizontalHeaderCombo, QOverload<int>::of(&QComboBox::currentIndexChanged),
+            this, &Window::horizontalHeaderChanged);
+    connect(verticalHeaderCombo, QOverload<int>::of(&QComboBox::currentIndexChanged),
+            this, &Window::verticalHeaderChanged);
 //! [11]
 
     QHBoxLayout *checkBoxLayout = new QHBoxLayout;
@@ -382,14 +382,14 @@ void Window::createDatesGroupBox()
     maximumDateLabel->setBuddy(maximumDateEdit);
 
 //! [13] //! [14]
-    connect(currentDateEdit, SIGNAL(dateChanged(QDate)),
-            calendar, SLOT(setSelectedDate(QDate)));
-    connect(calendar, SIGNAL(selectionChanged()),
-            this, SLOT(selectedDateChanged()));
-    connect(minimumDateEdit, SIGNAL(dateChanged(QDate)),
-            this, SLOT(minimumDateChanged(QDate)));
-    connect(maximumDateEdit, SIGNAL(dateChanged(QDate)),
-            this, SLOT(maximumDateChanged(QDate)));
+    connect(currentDateEdit, &QDateEdit::dateChanged,
+            calendar, &QCalendarWidget::setSelectedDate);
+    connect(calendar, &QCalendarWidget::selectionChanged,
+            this, &Window::selectedDateChanged);
+    connect(minimumDateEdit, &QDateEdit::dateChanged,
+            this, &Window::minimumDateChanged);
+    connect(maximumDateEdit, &QDateEdit::dateChanged,
+            this, &Window::maximumDateChanged);
 
 //! [14]
     QGridLayout *dateBoxLayout = new QGridLayout;
@@ -439,20 +439,20 @@ void Window::createTextFormatsGroupBox()
     mayFirstCheckBox = new QCheckBox(tr("May &1 in red"));
 
 //! [17] //! [18]
-    connect(weekdayColorCombo, SIGNAL(currentIndexChanged(int)),
-            this, SLOT(weekdayFormatChanged()));
-    connect(weekdayColorCombo, SIGNAL(currentIndexChanged(int)),
-            this, SLOT(reformatCalendarPage()));
-    connect(weekendColorCombo, SIGNAL(currentIndexChanged(int)),
-            this, SLOT(weekendFormatChanged()));
-    connect(weekendColorCombo, SIGNAL(currentIndexChanged(int)),
-            this, SLOT(reformatCalendarPage()));
-    connect(headerTextFormatCombo, SIGNAL(currentIndexChanged(QString)),
-            this, SLOT(reformatHeaders()));
-    connect(firstFridayCheckBox, SIGNAL(toggled(bool)),
-            this, SLOT(reformatCalendarPage()));
-    connect(mayFirstCheckBox, SIGNAL(toggled(bool)),
-            this, SLOT(reformatCalendarPage()));
+    connect(weekdayColorCombo, QOverload<int>::of(&QComboBox::currentIndexChanged),
+            this, &Window::weekdayFormatChanged);
+    connect(weekdayColorCombo, QOverload<int>::of(&QComboBox::currentIndexChanged),
+            this, &Window::reformatCalendarPage);
+    connect(weekendColorCombo, QOverload<int>::of(&QComboBox::currentIndexChanged),
+            this, &Window::weekendFormatChanged);
+    connect(weekendColorCombo, QOverload<int>::of(&QComboBox::currentIndexChanged),
+            this, &Window::reformatCalendarPage);
+    connect(headerTextFormatCombo, QOverload<int>::of(&QComboBox::currentIndexChanged),
+            this, &Window::reformatHeaders);
+    connect(firstFridayCheckBox, &QCheckBox::toggled,
+            this, &Window::reformatCalendarPage);
+    connect(mayFirstCheckBox, &QCheckBox::toggled,
+            this, &Window::reformatCalendarPage);
 
 //! [18]
     QHBoxLayout *checkBoxLayout = new QHBoxLayout;
diff --git a/examples/widgets/widgets/codeeditor/codeeditor.cpp b/examples/widgets/widgets/codeeditor/codeeditor.cpp
index 7e56a75294..8e29860669 100644
--- a/examples/widgets/widgets/codeeditor/codeeditor.cpp
+++ b/examples/widgets/widgets/codeeditor/codeeditor.cpp
@@ -58,9 +58,9 @@ CodeEditor::CodeEditor(QWidget *parent) : QPlainTextEdit(parent)
 {
     lineNumberArea = new LineNumberArea(this);
 
-    connect(this, SIGNAL(blockCountChanged(int)), this, SLOT(updateLineNumberAreaWidth(int)));
-    connect(this, SIGNAL(updateRequest(QRect,int)), this, SLOT(updateLineNumberArea(QRect,int)));
-    connect(this, SIGNAL(cursorPositionChanged()), this, SLOT(highlightCurrentLine()));
+    connect(this, &CodeEditor::blockCountChanged, this, &CodeEditor::updateLineNumberAreaWidth);
+    connect(this, &CodeEditor::updateRequest, this, &CodeEditor::updateLineNumberArea);
+    connect(this, &CodeEditor::cursorPositionChanged, this, &CodeEditor::highlightCurrentLine);
 
     updateLineNumberAreaWidth(0);
     highlightCurrentLine();
diff --git a/examples/widgets/widgets/lineedits/window.cpp b/examples/widgets/widgets/lineedits/window.cpp
index 0926f6f20b..33f09d544d 100644
--- a/examples/widgets/widgets/lineedits/window.cpp
+++ b/examples/widgets/widgets/lineedits/window.cpp
@@ -123,16 +123,16 @@ Window::Window(QWidget *parent)
 //! [4]
 
 //! [5]
-    connect(echoComboBox, SIGNAL(activated(int)),
-            this, SLOT(echoChanged(int)));
-    connect(validatorComboBox, SIGNAL(activated(int)),
-            this, SLOT(validatorChanged(int)));
-    connect(alignmentComboBox, SIGNAL(activated(int)),
-            this, SLOT(alignmentChanged(int)));
-    connect(inputMaskComboBox, SIGNAL(activated(int)),
-            this, SLOT(inputMaskChanged(int)));
-    connect(accessComboBox, SIGNAL(activated(int)),
-            this, SLOT(accessChanged(int)));
+    connect(echoComboBox, QOverload<int>::of(&QComboBox::activated),
+            this, &Window::echoChanged);
+    connect(validatorComboBox, QOverload<int>::of(&QComboBox::activated),
+            this, &Window::validatorChanged);
+    connect(alignmentComboBox, QOverload<int>::of(&QComboBox::activated),
+            this, &Window::alignmentChanged);
+    connect(inputMaskComboBox, QOverload<int>::of(&QComboBox::activated),
+            this, &Window::inputMaskChanged);
+    connect(accessComboBox, QOverload<int>::of(&QComboBox::activated),
+            this, &Window::accessChanged);
 //! [5]
 
 //! [6]
diff --git a/examples/widgets/widgets/mousebuttons/main.cpp b/examples/widgets/widgets/mousebuttons/main.cpp
index 28be0ffddf..e35a442181 100644
--- a/examples/widgets/widgets/mousebuttons/main.cpp
+++ b/examples/widgets/widgets/mousebuttons/main.cpp
@@ -68,7 +68,7 @@ int main(int argv, char **args)
     testArea->setText("To test your mouse with Qt, press buttons in this area.\nYou may also scroll or tilt your mouse wheel.");
     QPushButton *quitButton = new QPushButton("Quit");
 
-    QObject::connect(quitButton, SIGNAL(clicked()), qApp, SLOT(quit()));
+    QObject::connect(quitButton, &QPushButton::clicked, qApp, &QCoreApplication::quit);
 
     QVBoxLayout *layout = new QVBoxLayout;
     layout->addWidget(testArea);
diff --git a/examples/widgets/widgets/movie/movieplayer.cpp b/examples/widgets/widgets/movie/movieplayer.cpp
index 61e85537a3..3003bfb541 100644
--- a/examples/widgets/widgets/movie/movieplayer.cpp
+++ b/examples/widgets/widgets/movie/movieplayer.cpp
@@ -69,13 +69,12 @@ MoviePlayer::MoviePlayer(QWidget *parent)
     createControls();
     createButtons();
 
-    connect(movie, SIGNAL(frameChanged(int)), this, SLOT(updateFrameSlider()));
-    connect(movie, SIGNAL(stateChanged(QMovie::MovieState)),
-            this, SLOT(updateButtons()));
-    connect(fitCheckBox, SIGNAL(clicked()), this, SLOT(fitToWindow()));
-    connect(frameSlider, SIGNAL(valueChanged(int)), this, SLOT(goToFrame(int)));
-    connect(speedSpinBox, SIGNAL(valueChanged(int)),
-            movie, SLOT(setSpeed(int)));
+    connect(movie, &QMovie::frameChanged, this, &MoviePlayer::updateFrameSlider);
+    connect(movie, &QMovie::stateChanged, this, &MoviePlayer::updateButtons);
+    connect(fitCheckBox, &QCheckBox::clicked, this, &MoviePlayer::fitToWindow);
+    connect(frameSlider, &QSlider::valueChanged, this, &MoviePlayer::goToFrame);
+    connect(speedSpinBox, QOverload<int>::of(&QSpinBox::valueChanged),
+            movie, &QMovie::setSpeed);
 
     mainLayout = new QVBoxLayout;
     mainLayout->addWidget(movieLabel);
@@ -182,32 +181,32 @@ void MoviePlayer::createButtons()
     openButton->setIcon(style()->standardIcon(QStyle::SP_DialogOpenButton));
     openButton->setIconSize(iconSize);
     openButton->setToolTip(tr("Open File"));
-    connect(openButton, SIGNAL(clicked()), this, SLOT(open()));
+    connect(openButton, &QToolButton::clicked, this, &MoviePlayer::open);
 
     playButton = new QToolButton;
     playButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));
     playButton->setIconSize(iconSize);
     playButton->setToolTip(tr("Play"));
-    connect(playButton, SIGNAL(clicked()), movie, SLOT(start()));
+    connect(playButton, &QToolButton::clicked, movie, &QMovie::start);
 
     pauseButton = new QToolButton;
     pauseButton->setCheckable(true);
     pauseButton->setIcon(style()->standardIcon(QStyle::SP_MediaPause));
     pauseButton->setIconSize(iconSize);
     pauseButton->setToolTip(tr("Pause"));
-    connect(pauseButton, SIGNAL(clicked(bool)), movie, SLOT(setPaused(bool)));
+    connect(pauseButton, &QToolButton::clicked, movie, &QMovie::setPaused);
 
     stopButton = new QToolButton;
     stopButton->setIcon(style()->standardIcon(QStyle::SP_MediaStop));
     stopButton->setIconSize(iconSize);
     stopButton->setToolTip(tr("Stop"));
-    connect(stopButton, SIGNAL(clicked()), movie, SLOT(stop()));
+    connect(stopButton, &QToolButton::clicked, movie, &QMovie::stop);
 
     quitButton = new QToolButton;
     quitButton->setIcon(style()->standardIcon(QStyle::SP_DialogCloseButton));
     quitButton->setIconSize(iconSize);
     quitButton->setToolTip(tr("Quit"));
-    connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));
+    connect(quitButton, &QToolButton::clicked, this, &MoviePlayer::close);
 
     buttonsLayout = new QHBoxLayout;
     buttonsLayout->addStretch();
diff --git a/examples/widgets/widgets/scribble/mainwindow.cpp b/examples/widgets/widgets/scribble/mainwindow.cpp
index b8d01d505c..58dc42c076 100644
--- a/examples/widgets/widgets/scribble/mainwindow.cpp
+++ b/examples/widgets/widgets/scribble/mainwindow.cpp
@@ -151,40 +151,40 @@ void MainWindow::createActions()
 {
     openAct = new QAction(tr("&Open..."), this);
     openAct->setShortcuts(QKeySequence::Open);
-    connect(openAct, SIGNAL(triggered()), this, SLOT(open()));
+    connect(openAct, &QAction::triggered, this, &MainWindow::open);
 
     foreach (QByteArray format, QImageWriter::supportedImageFormats()) {
         QString text = tr("%1...").arg(QString(format).toUpper());
 
         QAction *action = new QAction(text, this);
         action->setData(format);
-        connect(action, SIGNAL(triggered()), this, SLOT(save()));
+        connect(action, &QAction::triggered, this, &MainWindow::save);
         saveAsActs.append(action);
     }
 
     printAct = new QAction(tr("&Print..."), this);
-    connect(printAct, SIGNAL(triggered()), scribbleArea, SLOT(print()));
+    connect(printAct, &QAction::triggered, scribbleArea, &ScribbleArea::print);
 
     exitAct = new QAction(tr("E&xit"), this);
     exitAct->setShortcuts(QKeySequence::Quit);
-    connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));
+    connect(exitAct, &QAction::triggered, this, &MainWindow::close);
 
     penColorAct = new QAction(tr("&Pen Color..."), this);
-    connect(penColorAct, SIGNAL(triggered()), this, SLOT(penColor()));
+    connect(penColorAct, &QAction::triggered, this, &MainWindow::penColor);
 
     penWidthAct = new QAction(tr("Pen &Width..."), this);
-    connect(penWidthAct, SIGNAL(triggered()), this, SLOT(penWidth()));
+    connect(penWidthAct, &QAction::triggered, this, &MainWindow::penWidth);
 
     clearScreenAct = new QAction(tr("&Clear Screen"), this);
     clearScreenAct->setShortcut(tr("Ctrl+L"));
-    connect(clearScreenAct, SIGNAL(triggered()),
-            scribbleArea, SLOT(clearImage()));
+    connect(clearScreenAct, &QAction::triggered,
+            scribbleArea, &ScribbleArea::clearImage);
 
     aboutAct = new QAction(tr("&About"), this);
-    connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
+    connect(aboutAct, &QAction::triggered, this, &MainWindow::about);
 
     aboutQtAct = new QAction(tr("About &Qt"), this);
-    connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
+    connect(aboutQtAct, &QAction::triggered, qApp, &QApplication::aboutQt);
 }
 //! [14]
 
diff --git a/examples/widgets/widgets/shapedclock/shapedclock.cpp b/examples/widgets/widgets/shapedclock/shapedclock.cpp
index af0cd01be5..8e7d831938 100644
--- a/examples/widgets/widgets/shapedclock/shapedclock.cpp
+++ b/examples/widgets/widgets/shapedclock/shapedclock.cpp
@@ -57,12 +57,12 @@ ShapedClock::ShapedClock(QWidget *parent)
     : QWidget(parent, Qt::FramelessWindowHint | Qt::WindowSystemMenuHint)
 {
     QTimer *timer = new QTimer(this);
-    connect(timer, SIGNAL(timeout()), this, SLOT(update()));
+    connect(timer, &QTimer::timeout, this, QOverload<>::of(&ShapedClock::update));
     timer->start(1000);
 
     QAction *quitAction = new QAction(tr("E&xit"), this);
     quitAction->setShortcut(tr("Ctrl+Q"));
-    connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
+    connect(quitAction, &QAction::triggered, qApp, &QCoreApplication::quit);
     addAction(quitAction);
 
     setContextMenuPolicy(Qt::ActionsContextMenu);
diff --git a/examples/widgets/widgets/sliders/slidersgroup.cpp b/examples/widgets/widgets/sliders/slidersgroup.cpp
index 365a003047..3bccdd687a 100644
--- a/examples/widgets/widgets/sliders/slidersgroup.cpp
+++ b/examples/widgets/widgets/sliders/slidersgroup.cpp
@@ -69,11 +69,11 @@ SlidersGroup::SlidersGroup(Qt::Orientation orientation, const QString &title,
     dial = new QDial;
     dial->setFocusPolicy(Qt::StrongFocus);
 
-    connect(slider, SIGNAL(valueChanged(int)), scrollBar, SLOT(setValue(int)));
-    connect(scrollBar, SIGNAL(valueChanged(int)), dial, SLOT(setValue(int)));
-    connect(dial, SIGNAL(valueChanged(int)), slider, SLOT(setValue(int)));
+    connect(slider, &QSlider::valueChanged, scrollBar, &QScrollBar::setValue);
+    connect(scrollBar, &QScrollBar::valueChanged, dial, &QDial::setValue);
+    connect(dial, &QDial::valueChanged, slider, &QSlider::setValue);
 //! [0] //! [1]
-    connect(dial, SIGNAL(valueChanged(int)), this, SIGNAL(valueChanged(int)));
+    connect(dial, &QDial::valueChanged, this, &SlidersGroup::valueChanged);
 //! [1] //! [2]
 
 //! [2] //! [3]
diff --git a/examples/widgets/widgets/sliders/window.cpp b/examples/widgets/widgets/sliders/window.cpp
index 16467e71be..d73fafec10 100644
--- a/examples/widgets/widgets/sliders/window.cpp
+++ b/examples/widgets/widgets/sliders/window.cpp
@@ -68,13 +68,13 @@ Window::Window(QWidget *parent)
 //! [0]
 
 //! [1]
-    connect(horizontalSliders, SIGNAL(valueChanged(int)),
+    connect(horizontalSliders, &SlidersGroup::valueChanged,
 //! [1] //! [2]
-            verticalSliders, SLOT(setValue(int)));
-    connect(verticalSliders, SIGNAL(valueChanged(int)),
-            valueSpinBox, SLOT(setValue(int)));
-    connect(valueSpinBox, SIGNAL(valueChanged(int)),
-            horizontalSliders, SLOT(setValue(int)));
+            verticalSliders, &SlidersGroup::setValue);
+    connect(verticalSliders, &SlidersGroup::valueChanged,
+            valueSpinBox, &QSpinBox::setValue);
+    connect(valueSpinBox, QOverload<int>::of(&QSpinBox::valueChanged),
+            horizontalSliders, &SlidersGroup::setValue);
 
     QHBoxLayout *layout = new QHBoxLayout;
     layout->addWidget(controlsGroup);
@@ -121,25 +121,25 @@ void Window::createControls(const QString &title)
     orientationCombo->addItem(tr("Vertical slider-like widgets"));
 
 //! [6] //! [7]
-    connect(orientationCombo, SIGNAL(activated(int)),
+    connect(orientationCombo, QOverload<int>::of(&QComboBox::activated),
 //! [7] //! [8]
-            stackedWidget, SLOT(setCurrentIndex(int)));
-    connect(minimumSpinBox, SIGNAL(valueChanged(int)),
-            horizontalSliders, SLOT(setMinimum(int)));
-    connect(minimumSpinBox, SIGNAL(valueChanged(int)),
-            verticalSliders, SLOT(setMinimum(int)));
-    connect(maximumSpinBox, SIGNAL(valueChanged(int)),
-            horizontalSliders, SLOT(setMaximum(int)));
-    connect(maximumSpinBox, SIGNAL(valueChanged(int)),
-            verticalSliders, SLOT(setMaximum(int)));
-    connect(invertedAppearance, SIGNAL(toggled(bool)),
-            horizontalSliders, SLOT(invertAppearance(bool)));
-    connect(invertedAppearance, SIGNAL(toggled(bool)),
-            verticalSliders, SLOT(invertAppearance(bool)));
-    connect(invertedKeyBindings, SIGNAL(toggled(bool)),
-            horizontalSliders, SLOT(invertKeyBindings(bool)));
-    connect(invertedKeyBindings, SIGNAL(toggled(bool)),
-            verticalSliders, SLOT(invertKeyBindings(bool)));
+            stackedWidget, &QStackedWidget::setCurrentIndex);
+    connect(minimumSpinBox, QOverload<int>::of(&QSpinBox::valueChanged),
+            horizontalSliders, &SlidersGroup::setMinimum);
+    connect(minimumSpinBox, QOverload<int>::of(&QSpinBox::valueChanged),
+            verticalSliders, &SlidersGroup::setMinimum);
+    connect(maximumSpinBox, QOverload<int>::of(&QSpinBox::valueChanged),
+            horizontalSliders, &SlidersGroup::setMaximum);
+    connect(maximumSpinBox, QOverload<int>::of(&QSpinBox::valueChanged),
+            verticalSliders, &SlidersGroup::setMaximum);
+    connect(invertedAppearance, &QCheckBox::toggled,
+            horizontalSliders, &SlidersGroup::invertAppearance);
+    connect(invertedAppearance, &QCheckBox::toggled,
+            verticalSliders, &SlidersGroup::invertAppearance);
+    connect(invertedKeyBindings, &QCheckBox::toggled,
+            horizontalSliders, &SlidersGroup::invertKeyBindings);
+    connect(invertedKeyBindings, &QCheckBox::toggled,
+            verticalSliders, &SlidersGroup::invertKeyBindings);
 
     QGridLayout *controlsLayout = new QGridLayout;
     controlsLayout->addWidget(minimumLabel, 0, 0);
diff --git a/examples/widgets/widgets/spinboxes/window.cpp b/examples/widgets/widgets/spinboxes/window.cpp
index eb660faace..fd7c5b527e 100644
--- a/examples/widgets/widgets/spinboxes/window.cpp
+++ b/examples/widgets/widgets/spinboxes/window.cpp
@@ -176,8 +176,8 @@ void Window::createDateTimeEdits()
     formatComboBox->addItem("hh:mm ap");
 //! [9] //! [10]
 
-    connect(formatComboBox, SIGNAL(activated(QString)),
-            this, SLOT(setFormatString(QString)));
+    connect(formatComboBox, QOverload<const QString &>::of(&QComboBox::activated),
+            this, &Window::setFormatString);
 //! [10]
 
     setFormatString(formatComboBox->currentText());
@@ -256,9 +256,9 @@ void Window::createDoubleSpinBoxes()
     priceSpinBox->setPrefix("$");
     priceSpinBox->setValue(99.99);
 
-    connect(precisionSpinBox, SIGNAL(valueChanged(int)),
+    connect(precisionSpinBox, QOverload<int>::of(&QSpinBox::valueChanged),
 //! [17]
-            this, SLOT(changePrecision(int)));
+            this, &Window::changePrecision);
 
     groupSeparatorSpinBox_d = new QDoubleSpinBox;
     groupSeparatorSpinBox_d->setRange(-99999999, 99999999);
diff --git a/examples/widgets/widgets/styles/widgetgallery.cpp b/examples/widgets/widgets/styles/widgetgallery.cpp
index d44547d905..dbe82c547b 100644
--- a/examples/widgets/widgets/styles/widgetgallery.cpp
+++ b/examples/widgets/widgets/styles/widgetgallery.cpp
@@ -79,19 +79,19 @@ WidgetGallery::WidgetGallery(QWidget *parent)
 //! [0]
 
 //! [1]
-    connect(styleComboBox, SIGNAL(activated(QString)),
+    connect(styleComboBox, QOverload<const QString &>::of(&QComboBox::activated),
 //! [1] //! [2]
-            this, SLOT(changeStyle(QString)));
-    connect(useStylePaletteCheckBox, SIGNAL(toggled(bool)),
-            this, SLOT(changePalette()));
-    connect(disableWidgetsCheckBox, SIGNAL(toggled(bool)),
-            topLeftGroupBox, SLOT(setDisabled(bool)));
-    connect(disableWidgetsCheckBox, SIGNAL(toggled(bool)),
-            topRightGroupBox, SLOT(setDisabled(bool)));
-    connect(disableWidgetsCheckBox, SIGNAL(toggled(bool)),
-            bottomLeftTabWidget, SLOT(setDisabled(bool)));
-    connect(disableWidgetsCheckBox, SIGNAL(toggled(bool)),
-            bottomRightGroupBox, SLOT(setDisabled(bool)));
+            this, &WidgetGallery::changeStyle);
+    connect(useStylePaletteCheckBox, &QCheckBox::toggled,
+            this, &WidgetGallery::changePalette);
+    connect(disableWidgetsCheckBox, &QCheckBox::toggled,
+            topLeftGroupBox, &QGroupBox::setDisabled);
+    connect(disableWidgetsCheckBox, &QCheckBox::toggled,
+            topRightGroupBox, &QGroupBox::setDisabled);
+    connect(disableWidgetsCheckBox, &QCheckBox::toggled,
+            bottomLeftTabWidget, &QGroupBox::setDisabled);
+    connect(disableWidgetsCheckBox, &QCheckBox::toggled,
+            bottomRightGroupBox, &QGroupBox::setDisabled);
 //! [2]
 
 //! [3]
@@ -279,7 +279,7 @@ void WidgetGallery::createProgressBar()
     progressBar->setValue(0);
 
     QTimer *timer = new QTimer(this);
-    connect(timer, SIGNAL(timeout()), this, SLOT(advanceProgressBar()));
+    connect(timer, &QTimer::timeout, this, &WidgetGallery::advanceProgressBar);
     timer->start(1000);
 }
 //! [13]
diff --git a/examples/widgets/widgets/stylesheet/mainwindow.cpp b/examples/widgets/widgets/stylesheet/mainwindow.cpp
index eb4b3a2424..f187c007dd 100644
--- a/examples/widgets/widgets/stylesheet/mainwindow.cpp
+++ b/examples/widgets/widgets/stylesheet/mainwindow.cpp
@@ -64,8 +64,8 @@ MainWindow::MainWindow(QWidget *parent)
 
     statusBar()->addWidget(new QLabel(tr("Ready")));
 
-    connect(ui.exitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
-    connect(ui.aboutQtAction, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
+    connect(ui.exitAction, &QAction::triggered, qApp, &QApplication::quit);
+    connect(ui.aboutQtAction, &QAction::triggered, qApp, &QApplication::aboutQt);
 }
 
 void MainWindow::on_editStyleAction_triggered()
diff --git a/examples/widgets/widgets/validators/ledwidget.cpp b/examples/widgets/widgets/validators/ledwidget.cpp
index 65248741b5..462f416c86 100644
--- a/examples/widgets/widgets/validators/ledwidget.cpp
+++ b/examples/widgets/widgets/validators/ledwidget.cpp
@@ -56,7 +56,7 @@ LEDWidget::LEDWidget(QWidget *parent)
     setPixmap(offPixmap);
     flashTimer.setInterval(200);
     flashTimer.setSingleShot(true);
-    connect(&flashTimer, SIGNAL(timeout()), this, SLOT(extinguish()));
+    connect(&flashTimer, &QTimer::timeout, this, &LEDWidget::extinguish);
 };
 
 void LEDWidget::extinguish()
diff --git a/examples/widgets/widgets/validators/localeselector.cpp b/examples/widgets/widgets/validators/localeselector.cpp
index 2f702c9753..7253fea9ec 100644
--- a/examples/widgets/widgets/validators/localeselector.cpp
+++ b/examples/widgets/widgets/validators/localeselector.cpp
@@ -79,7 +79,8 @@ LocaleSelector::LocaleSelector(QWidget *parent)
     if (curIndex != -1)
         setCurrentIndex(curIndex);
 
-    connect(this, SIGNAL(activated(int)), this, SLOT(emitLocaleSelected(int)));
+    connect(this, QOverload<int>::of(&LocaleSelector::activated),
+            this, &LocaleSelector::emitLocaleSelected);
 }
 
 void LocaleSelector::emitLocaleSelected(int index)
diff --git a/examples/widgets/widgets/windowflags/controllerwindow.cpp b/examples/widgets/widgets/windowflags/controllerwindow.cpp
index c19f23c513..e2abad89f4 100644
--- a/examples/widgets/widgets/windowflags/controllerwindow.cpp
+++ b/examples/widgets/widgets/windowflags/controllerwindow.cpp
@@ -62,7 +62,8 @@ ControllerWindow::ControllerWindow(QWidget *parent)
     createHintsGroupBox();
 
     quitButton = new QPushButton(tr("&Quit"));
-    connect(quitButton, SIGNAL(clicked()), qApp, SLOT(quit()));
+    connect(quitButton, &QPushButton::clicked,
+            qApp, &QApplication::quit);
 
     QHBoxLayout *bottomLayout = new QHBoxLayout;
     bottomLayout->addStretch();
@@ -220,7 +221,8 @@ void ControllerWindow::createHintsGroupBox()
 QCheckBox *ControllerWindow::createCheckBox(const QString &text)
 {
     QCheckBox *checkBox = new QCheckBox(text);
-    connect(checkBox, SIGNAL(clicked()), this, SLOT(updatePreview()));
+    connect(checkBox, &QCheckBox::clicked,
+            this, &ControllerWindow::updatePreview);
     return checkBox;
 }
 //! [7]
@@ -229,7 +231,8 @@ QCheckBox *ControllerWindow::createCheckBox(const QString &text)
 QRadioButton *ControllerWindow::createRadioButton(const QString &text)
 {
     QRadioButton *button = new QRadioButton(text);
-    connect(button, SIGNAL(clicked()), this, SLOT(updatePreview()));
+    connect(button, &QRadioButton::clicked,
+            this, &ControllerWindow::updatePreview);
     return button;
 }
 //! [8]
diff --git a/examples/widgets/widgets/windowflags/previewwindow.cpp b/examples/widgets/widgets/windowflags/previewwindow.cpp
index 725a134daf..09e26fd7e4 100644
--- a/examples/widgets/widgets/windowflags/previewwindow.cpp
+++ b/examples/widgets/widgets/windowflags/previewwindow.cpp
@@ -61,7 +61,8 @@ PreviewWindow::PreviewWindow(QWidget *parent)
     textEdit->setLineWrapMode(QTextEdit::NoWrap);
 
     closeButton = new QPushButton(tr("&Close"));
-    connect(closeButton, SIGNAL(clicked()), this, SLOT(close()));
+    connect(closeButton, &QPushButton::clicked,
+            this, &PreviewWindow::close);
 
     QVBoxLayout *layout = new QVBoxLayout;
     layout->addWidget(textEdit);