4 files changed, 58 insertions, 36 deletions
diff --git a/examples/widgets/mainwindows/application/mainwindow.cpp b/examples/widgets/mainwindows/application/mainwindow.cpp
index 4b639ead18..d0c009427f 100644
--- a/examples/widgets/mainwindows/application/mainwindow.cpp
+++ b/examples/widgets/mainwindows/application/mainwindow.cpp
@@ -281,7 +281,7 @@ void MainWindow::readSettings()
     QSettings settings(QCoreApplication::organizationName(), QCoreApplication::applicationName());
     const QByteArray geometry = settings.value("geometry", QByteArray()).toByteArray();
     if (geometry.isEmpty()) {
-        const QRect availableGeometry = QApplication::desktop()->availableGeometry(this);
+        const QRect availableGeometry = screen()->availableGeometry();
         resize(availableGeometry.width() / 3, availableGeometry.height() / 2);
         move((availableGeometry.width() - width()) / 2,
              (availableGeometry.height() - height()) / 2);
@@ -353,23 +353,27 @@ void MainWindow::loadFile(const QString &fileName)
 bool MainWindow::saveFile(const QString &fileName)
 //! [44] //! [45]
 {
-    QFile file(fileName);
-    if (!file.open(QFile::WriteOnly | QFile::Text)) {
-        QMessageBox::warning(this, tr("Application"),
-                             tr("Cannot write file %1:\n%2.")
-                             .arg(QDir::toNativeSeparators(fileName),
-                                  file.errorString()));
-        return false;
-    }
+    QString errorMessage;
 
-    QTextStream out(&file);
-#ifndef QT_NO_CURSOR
     QGuiApplication::setOverrideCursor(Qt::WaitCursor);
-#endif
-    out << textEdit->toPlainText();
-#ifndef QT_NO_CURSOR
+    QSaveFile file(fileName);
+    if (file.open(QFile::WriteOnly | QFile::Text)) {
+        QTextStream out(&file);
+        out << textEdit->toPlainText();
+        if (!file.commit()) {
+            errorMessage = tr("Cannot write file %1:\n%2.")
+                           .arg(QDir::toNativeSeparators(fileName), file.errorString());
+        }
+    } else {
+        errorMessage = tr("Cannot open file %1 for writing:\n%2.")
+                       .arg(QDir::toNativeSeparators(fileName), file.errorString());
+    }
     QGuiApplication::restoreOverrideCursor();
-#endif
+
+    if (!errorMessage.isEmpty()) {
+        QMessageBox::warning(this, tr("Application"), errorMessage);
+        return false;
+    }
 
     setCurrentFile(fileName);
     statusBar()->showMessage(tr("File saved"), 2000);
diff --git a/examples/widgets/mainwindows/mdi/mainwindow.cpp b/examples/widgets/mainwindows/mdi/mainwindow.cpp
index b952d19e2e..ccfa7435d7 100644
--- a/examples/widgets/mainwindows/mdi/mainwindow.cpp
+++ b/examples/widgets/mainwindows/mdi/mainwindow.cpp
@@ -464,7 +464,7 @@ void MainWindow::readSettings()
     QSettings settings(QCoreApplication::organizationName(), QCoreApplication::applicationName());
     const QByteArray geometry = settings.value("geometry", QByteArray()).toByteArray();
     if (geometry.isEmpty()) {
-        const QRect availableGeometry = QApplication::desktop()->availableGeometry(this);
+        const QRect availableGeometry = screen()->availableGeometry();
         resize(availableGeometry.width() / 3, availableGeometry.height() / 2);
         move((availableGeometry.width() - width()) / 2,
              (availableGeometry.height() - height()) / 2);
diff --git a/examples/widgets/mainwindows/mdi/mdichild.cpp b/examples/widgets/mainwindows/mdi/mdichild.cpp
index 16f2040de0..727d4f6cfd 100644
--- a/examples/widgets/mainwindows/mdi/mdichild.cpp
+++ b/examples/widgets/mainwindows/mdi/mdichild.cpp
@@ -115,19 +115,28 @@ bool MdiChild::saveAs()
 
 bool MdiChild::saveFile(const QString &fileName)
 {
-    QFile file(fileName);
-    if (!file.open(QFile::WriteOnly | QFile::Text)) {
-        QMessageBox::warning(this, tr("MDI"),
-                             tr("Cannot write file %1:\n%2.")
-                             .arg(QDir::toNativeSeparators(fileName), file.errorString()));
-        return false;
-    }
+    QString errorMessage;
 
-    QTextStream out(&file);
     QGuiApplication::setOverrideCursor(Qt::WaitCursor);
-    out << toPlainText();
+    QSaveFile file(fileName);
+    if (file.open(QFile::WriteOnly | QFile::Text)) {
+        QTextStream out(&file);
+        out << toPlainText();
+        if (!file.commit()) {
+            errorMessage = tr("Cannot write file %1:\n%2.")
+                           .arg(QDir::toNativeSeparators(fileName), file.errorString());
+        }
+    } else {
+        errorMessage = tr("Cannot open file %1 for writing:\n%2.")
+                       .arg(QDir::toNativeSeparators(fileName), file.errorString());
+    }
     QGuiApplication::restoreOverrideCursor();
 
+    if (!errorMessage.isEmpty()) {
+        QMessageBox::warning(this, tr("MDI"), errorMessage);
+        return false;
+    }
+
     setCurrentFile(fileName);
     return true;
 }
diff --git a/examples/widgets/mainwindows/sdi/mainwindow.cpp b/examples/widgets/mainwindows/sdi/mainwindow.cpp
index 62a74b26e6..c3cd131923 100644
--- a/examples/widgets/mainwindows/sdi/mainwindow.cpp
+++ b/examples/widgets/mainwindows/sdi/mainwindow.cpp
@@ -167,7 +167,7 @@ void MainWindow::tile(const QMainWindow *previous)
     if (!topFrameWidth)
         topFrameWidth = 40;
     const QPoint pos = previous->pos() + 2 * QPoint(topFrameWidth, topFrameWidth);
-    if (QApplication::desktop()->availableGeometry(this).contains(rect().bottomRight() + pos))
+    if (screen()->availableGeometry().contains(rect().bottomRight() + pos))
         move(pos);
 }
 
@@ -290,7 +290,7 @@ void MainWindow::readSettings()
     QSettings settings(QCoreApplication::organizationName(), QCoreApplication::applicationName());
     const QByteArray geometry = settings.value("geometry", QByteArray()).toByteArray();
     if (geometry.isEmpty()) {
-        const QRect availableGeometry = QApplication::desktop()->availableGeometry(this);
+        const QRect availableGeometry = screen()->availableGeometry();
         resize(availableGeometry.width() / 3, availableGeometry.height() / 2);
         move((availableGeometry.width() - width()) / 2,
              (availableGeometry.height() - height()) / 2);
@@ -425,19 +425,28 @@ void MainWindow::openRecentFile()
 
 bool MainWindow::saveFile(const QString &fileName)
 {
-    QFile file(fileName);
-    if (!file.open(QFile::WriteOnly | QFile::Text)) {
-        QMessageBox::warning(this, tr("SDI"),
-                             tr("Cannot write file %1:\n%2.")
-                             .arg(QDir::toNativeSeparators(fileName), file.errorString()));
-        return false;
-    }
+    QString errorMessage;
 
-    QTextStream out(&file);
     QGuiApplication::setOverrideCursor(Qt::WaitCursor);
-    out << textEdit->toPlainText();
+    QSaveFile file(fileName);
+    if (file.open(QFile::WriteOnly | QFile::Text)) {
+        QTextStream out(&file);
+        out << textEdit->toPlainText();
+        if (!file.commit()) {
+            errorMessage = tr("Cannot write file %1:\n%2.")
+                           .arg(QDir::toNativeSeparators(fileName), file.errorString());
+        }
+    } else {
+        errorMessage = tr("Cannot open file %1 for writing:\n%2.")
+                       .arg(QDir::toNativeSeparators(fileName), file.errorString());
+    }
     QGuiApplication::restoreOverrideCursor();
 
+    if (!errorMessage.isEmpty()) {
+        QMessageBox::warning(this, tr("SDI"), errorMessage);
+        return false;
+    }
+
     setCurrentFile(fileName);
     statusBar()->showMessage(tr("File saved"), 2000);
     return true;