Itemviews: Cleanup examples

Cleanup some minor issues in the chart example:
 - remove unused members
 - use initializer list for members
 - pass a proper role to dataChanged()
 - honor roles parameter in PieView::dataChanged()
 - use nullptr instead 0
 - use new-style connect
 - fix indentation and other whitespaces

Change-Id: Idb212b07c006fe3ae31bee9cd9b1ba4d03043b5e
Reviewed-by: André Hartmann <aha_1980@gmx.de>
Reviewed-by: Paul Wicking <paul.wicking@qt.io>

1 files changed, 8 insertions, 6 deletions

diff --git a/examples/widgets/tutorials/modelview/5_edit/mainwindow.cpp b/examples/widgets/tutorials/modelview/5_edit/mainwindow.cpp
index e0b6ea7b1f..d8dfc33212 100644
--- a/examples/widgets/tutorials/modelview/5_edit/mainwindow.cpp
+++ b/examples/widgets/tutorials/modelview/5_edit/mainwindow.cpp
@@ -48,23 +48,25 @@
 **
 ****************************************************************************/
 
-#include <QTableView>
 #include "mainwindow.h"
 #include "mymodel.h"
 
+#include <QTableView>
+
 MainWindow::MainWindow(QWidget *parent)
     : QMainWindow(parent)
+    , tableView(new QTableView(this))
 {
-    tableView = new QTableView(this);
     setCentralWidget(tableView);
-    QAbstractTableModel *myModel = new MyModel(this);
+    MyModel *myModel = new MyModel(this);
     tableView->setModel(myModel);
 
     //transfer changes to the model to the window title
-    connect(myModel, SIGNAL(editCompleted(const QString &)), this, SLOT(setWindowTitle(const QString &)));
+    connect(myModel, &MyModel::editCompleted,
+            this, &MainWindow::showWindowTitle);
 }
 
-void MainWindow::showWindowTitle(const QString & title)
+void MainWindow::showWindowTitle(const QString &title)
 {
-setWindowTitle(title);
+    setWindowTitle(title);
 }