1 files changed, 27 insertions, 26 deletions

diff --git a/examples/widgets/tools/undo/mainwindow.cpp b/examples/widgets/tools/undo/mainwindow.cpp
index 118d604742..9d83e3067a 100644
--- a/examples/widgets/tools/undo/mainwindow.cpp
+++ b/examples/widgets/tools/undo/mainwindow.cpp
@@ -48,6 +48,10 @@
 **
 ****************************************************************************/
 
+#include "mainwindow.h"
+#include "document.h"
+#include "commands.h"
+
 #include <QUndoGroup>
 #include <QUndoStack>
 #include <QFileDialog>
@@ -55,9 +59,6 @@
 #include <QRandomGenerator>
 #include <QTextStream>
 #include <QToolButton>
-#include "document.h"
-#include "mainwindow.h"
-#include "commands.h"
 
 MainWindow::MainWindow(QWidget *parent)
     : QMainWindow(parent)
@@ -122,17 +123,17 @@ MainWindow::MainWindow(QWidget *parent)
 void MainWindow::updateActions()
 {
     Document *doc = currentDocument();
-    m_undoGroup->setActiveStack(doc == 0 ? 0 : doc->undoStack());
-    QString shapeName = doc == 0 ? QString() : doc->currentShapeName();
-
-    actionAddRobot->setEnabled(doc != 0);
-    actionAddSnowman->setEnabled(doc != 0);
-    actionAddCircle->setEnabled(doc != 0);
-    actionAddRectangle->setEnabled(doc != 0);
-    actionAddTriangle->setEnabled(doc != 0);
-    actionClose->setEnabled(doc != 0);
-    actionSave->setEnabled(doc != 0 && !doc->undoStack()->isClean());
-    undoLimit->setEnabled(doc != 0 && doc->undoStack()->count() == 0);
+    m_undoGroup->setActiveStack(doc == nullptr ? nullptr : doc->undoStack());
+    QString shapeName = doc == nullptr ? QString() : doc->currentShapeName();
+
+    actionAddRobot->setEnabled(doc != nullptr);
+    actionAddSnowman->setEnabled(doc != nullptr);
+    actionAddCircle->setEnabled(doc != nullptr);
+    actionAddRectangle->setEnabled(doc != nullptr);
+    actionAddTriangle->setEnabled(doc != nullptr);
+    actionClose->setEnabled(doc != nullptr);
+    actionSave->setEnabled(doc != nullptr && !doc->undoStack()->isClean());
+    undoLimit->setEnabled(doc != nullptr && doc->undoStack()->count() == 0);
 
     if (shapeName.isEmpty()) {
         actionRed->setEnabled(false);
@@ -147,7 +148,7 @@ void MainWindow::updateActions()
         actionRemoveShape->setEnabled(true);
     }
 
-    if (doc != 0) {
+    if (doc != nullptr) {
         int index = documentTabs->indexOf(doc);
         Q_ASSERT(index != -1);
         static const QIcon unsavedIcon(":/icons/filesave.png");
@@ -264,7 +265,7 @@ void MainWindow::removeDocument(Document *doc)
 void MainWindow::saveDocument()
 {
     Document *doc = currentDocument();
-    if (doc == 0)
+    if (doc == nullptr)
         return;
 
     for (;;) {
@@ -298,7 +299,7 @@ void MainWindow::saveDocument()
 void MainWindow::closeDocument()
 {
     Document *doc = currentDocument();
-    if (doc == 0)
+    if (doc == nullptr)
         return;
 
     if (!doc->undoStack()->isClean()) {
@@ -338,10 +339,10 @@ static QRect randomRect(const QSize &s)
 {
     QSize min = Shape::minSize;
 
-    int left = (int) ((0.0 + s.width() - min.width())*(QRandomGenerator::global()->bounded(1.0)));
-    int top = (int) ((0.0 + s.height() - min.height())*(QRandomGenerator::global()->bounded(1.0)));
-    int width = (int) ((0.0 + s.width() - left - min.width())*(QRandomGenerator::global()->bounded(1.0))) + min.width();
-    int height = (int) ((0.0 + s.height() - top - min.height())*(QRandomGenerator::global()->bounded(1.0))) + min.height();
+    int left = qRound((s.width() - min.width()) * (QRandomGenerator::global()->bounded(1.0)));
+    int top = qRound((s.height() - min.height()) * (QRandomGenerator::global()->bounded(1.0)));
+    int width = qRound((s.width() - left - min.width()) * (QRandomGenerator::global()->bounded(1.0))) + min.width();
+    int height = qRound((s.height() - top - min.height()) * (QRandomGenerator::global()->bounded(1.0))) + min.height();
 
     return QRect(left, top, width, height);
 }
@@ -349,7 +350,7 @@ static QRect randomRect(const QSize &s)
 void MainWindow::addShape()
 {
     Document *doc = currentDocument();
-    if (doc == 0)
+    if (doc == nullptr)
         return;
 
     Shape::Type type;
@@ -369,7 +370,7 @@ void MainWindow::addShape()
 void MainWindow::removeShape()
 {
     Document *doc = currentDocument();
-    if (doc == 0)
+    if (doc == nullptr)
         return;
 
     QString shapeName = doc->currentShapeName();
@@ -382,7 +383,7 @@ void MainWindow::removeShape()
 void MainWindow::setShapeColor()
 {
     Document *doc = currentDocument();
-    if (doc == 0)
+    if (doc == nullptr)
         return;
 
     QString shapeName = doc->currentShapeName();
@@ -409,7 +410,7 @@ void MainWindow::setShapeColor()
 void MainWindow::addSnowman()
 {
     Document *doc = currentDocument();
-    if (doc == 0)
+    if (doc == nullptr)
         return;
 
     // Create a macro command using beginMacro() and endMacro()
@@ -427,7 +428,7 @@ void MainWindow::addSnowman()
 void MainWindow::addRobot()
 {
     Document *doc = currentDocument();
-    if (doc == 0)
+    if (doc == nullptr)
         return;
 
     // Compose a macro command by explicitly adding children to a parent command