4 files changed, 14 insertions, 9 deletions
diff --git a/examples/widgets/widgets/windowflags/controllerwindow.cpp b/examples/widgets/widgets/windowflags/controllerwindow.cpp
index 78323810ed..e2abad89f4 100644
--- a/examples/widgets/widgets/windowflags/controllerwindow.cpp
+++ b/examples/widgets/widgets/windowflags/controllerwindow.cpp
@@ -53,7 +53,8 @@
 #include "controllerwindow.h"
 
 //! [0]
-ControllerWindow::ControllerWindow()
+ControllerWindow::ControllerWindow(QWidget *parent)
+    : QWidget(parent)
 {
     previewWindow = new PreviewWindow(this);
 
@@ -61,7 +62,8 @@ ControllerWindow::ControllerWindow()
     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();
@@ -219,7 +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]
@@ -228,7 +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/controllerwindow.h b/examples/widgets/widgets/windowflags/controllerwindow.h
index cfb88ed20f..43ec67e27f 100644
--- a/examples/widgets/widgets/windowflags/controllerwindow.h
+++ b/examples/widgets/widgets/windowflags/controllerwindow.h
@@ -69,7 +69,7 @@ class ControllerWindow : public QWidget
     Q_OBJECT
 
 public:
-    ControllerWindow();
+    ControllerWindow(QWidget *parent = nullptr);
 
 private slots:
     void updatePreview();
diff --git a/examples/widgets/widgets/windowflags/previewwindow.cpp b/examples/widgets/widgets/windowflags/previewwindow.cpp
index 725a134daf..8773dccb05 100644
--- a/examples/widgets/widgets/windowflags/previewwindow.cpp
+++ b/examples/widgets/widgets/windowflags/previewwindow.cpp
@@ -48,10 +48,10 @@
 **
 ****************************************************************************/
 
-#include <QtWidgets>
-
 #include "previewwindow.h"
 
+#include <QtWidgets>
+
 //! [0]
 PreviewWindow::PreviewWindow(QWidget *parent)
     : QWidget(parent)
@@ -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);
diff --git a/examples/widgets/widgets/windowflags/previewwindow.h b/examples/widgets/widgets/windowflags/previewwindow.h
index e9efd09507..9bb487e8ab 100644
--- 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);