6 files changed, 13 insertions, 17 deletions
diff --git a/examples/widgets/widgets/tetrix/main.cpp b/examples/widgets/widgets/tetrix/main.cpp
index 2698190e76..92f245ca14 100644
--- a/examples/widgets/widgets/tetrix/main.cpp
+++ b/examples/widgets/widgets/tetrix/main.cpp
@@ -48,12 +48,10 @@
 **
 ****************************************************************************/
 
-#include <QtWidgets>
-
-#include <stdlib.h>
-
 #include "tetrixwindow.h"
 
+#include <QApplication>
+
 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);
diff --git a/examples/widgets/widgets/tetrix/tetrixboard.cpp b/examples/widgets/widgets/tetrix/tetrixboard.cpp
index 222ab1fb4d..ef3ac4fc38 100644
--- a/examples/widgets/widgets/tetrix/tetrixboard.cpp
+++ b/examples/widgets/widgets/tetrix/tetrixboard.cpp
@@ -48,10 +48,10 @@
 **
 ****************************************************************************/
 
-#include <QtWidgets>
-
 #include "tetrixboard.h"
 
+#include <QtWidgets>
+
 //! [0]
 TetrixBoard::TetrixBoard(QWidget *parent)
     : QFrame(parent)
@@ -358,7 +358,7 @@ void TetrixBoard::showNextPiece()
 
     QPixmap pixmap(dx * squareWidth(), dy * squareHeight());
     QPainter painter(&pixmap);
-    painter.fillRect(pixmap.rect(), nextPieceLabel->palette().background());
+    painter.fillRect(pixmap.rect(), nextPieceLabel->palette().window());
 
     for (int i = 0; i < 4; ++i) {
         int x = nextPiece.x(i) - nextPiece.minX();
@@ -405,11 +405,11 @@ void TetrixBoard::drawSquare(QPainter &painter, int x, int y, TetrixShape shape)
     painter.fillRect(x + 1, y + 1, squareWidth() - 2, squareHeight() - 2,
                      color);
 
-    painter.setPen(color.light());
+    painter.setPen(color.lighter());
     painter.drawLine(x, y + squareHeight() - 1, x, y);
     painter.drawLine(x, y, x + squareWidth() - 1, y);
 
-    painter.setPen(color.dark());
+    painter.setPen(color.darker());
     painter.drawLine(x + 1, y + squareHeight() - 1,
                      x + squareWidth() - 1, y + squareHeight() - 1);
     painter.drawLine(x + squareWidth() - 1, y + squareHeight() - 1,
diff --git a/examples/widgets/widgets/tetrix/tetrixboard.h b/examples/widgets/widgets/tetrix/tetrixboard.h
index 7c6871dfbd..86bcfa4d6e 100644
--- 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;
diff --git a/examples/widgets/widgets/tetrix/tetrixpiece.cpp b/examples/widgets/widgets/tetrix/tetrixpiece.cpp
index 3d8fa86860..b1b3ca9a99 100644
--- a/examples/widgets/widgets/tetrix/tetrixpiece.cpp
+++ b/examples/widgets/widgets/tetrix/tetrixpiece.cpp
@@ -48,12 +48,10 @@
 **
 ****************************************************************************/
 
-#include <QtCore>
-
-#include <stdlib.h>
-
 #include "tetrixpiece.h"
 
+#include <QtCore>
+
 //! [0]
 void TetrixPiece::setRandomShape()
 {
diff --git a/examples/widgets/widgets/tetrix/tetrixwindow.cpp b/examples/widgets/widgets/tetrix/tetrixwindow.cpp
index 7e951aceb8..970a38c1dc 100644
--- a/examples/widgets/widgets/tetrix/tetrixwindow.cpp
+++ b/examples/widgets/widgets/tetrix/tetrixwindow.cpp
@@ -54,7 +54,8 @@
 #include "tetrixwindow.h"
 
 //! [0]
-TetrixWindow::TetrixWindow()
+TetrixWindow::TetrixWindow(QWidget *parent)
+    : QWidget(parent)
 {
     board = new TetrixBoard;
 //! [0]
diff --git a/examples/widgets/widgets/tetrix/tetrixwindow.h b/examples/widgets/widgets/tetrix/tetrixwindow.h
index a21cef2ecf..3743d6cd2a 100644
--- a/examples/widgets/widgets/tetrix/tetrixwindow.h
+++ b/examples/widgets/widgets/tetrix/tetrixwindow.h
@@ -51,7 +51,6 @@
 #ifndef TETRIXWINDOW_H
 #define TETRIXWINDOW_H
 
-#include <QFrame>
 #include <QWidget>
 
 QT_BEGIN_NAMESPACE
@@ -67,7 +66,7 @@ class TetrixWindow : public QWidget
     Q_OBJECT
 
 public:
-    TetrixWindow();
+    TetrixWindow(QWidget *parent = nullptr);
 
 private:
     QLabel *createLabel(const QString &text);