Don't use file dialog in the address book example

On small screen devices such as iPhone targets, the save file dialog is
using a non-native dialog, and it doesn't fit the screen real estate to
the extent that the [Ok] button is clipped away.

In addition, the open file dialog and the save file dialog doesn't
cooperate very well on platforms such as iOS without more plumbing.
Since using the file dialog is out of the scope for this example we
remove all usages of it.

Change-Id: Ie165355ed0b671d93e44d2d55791156367b0ea5c
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>
(cherry picked from commit 4dbb07f614c914e78437aacf7a1716f632da5e8a)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

examples/widgets/doc/src/addressbook.qdoc

@@ -381,17 +381,15 @@
     respective slots, we also connect \c AddressWidget's
     \c selectionChanged() signal to its \c updateActions() slot.
 
-    The \c openFile() function allows the user to choose a file with
-    the \l{QFileDialog::getOpenFileName()}{open file dialog}. The chosen
-    file has to be a custom \c{.dat} file that contains address book
-    contacts. This function is a slot connected to \c openAct in the
-    \uicontrol File menu.
+    The \c openFile() function opens a custom \c{addressbook.dat} file that
+    contains address book contacts. This function is a slot connected to
+    \c openAct in the \uicontrol File menu.
 
     \snippet itemviews/addressbook/mainwindow.cpp 2
 
-    The \c saveFile() function allows the user to save a file with
-    the \l{QFileDialog::getSaveFileName()}{save file dialog}. This function
-    is a slot connected to \c saveAct in the \uicontrol File menu.
+    The \c saveFile() function saves a custom \c{addressbook.dat} file that
+    will contain the address book contacts. This function is a slot connected
+    to \c saveAct in the \uicontrol File menu.
 
     \snippet itemviews/addressbook/mainwindow.cpp 3
 

examples/widgets/itemviews/addressbook/addresswidget.cpp

@@ -146,7 +146,7 @@ void AddressWidget::setupTabs()
 //! [1]
 
 //! [7]
-void AddressWidget::readFromFile(const QString &fileName)
+void AddressWidget::readFromFile()
 {
     QFile file(fileName);
 
@@ -171,7 +171,7 @@ void AddressWidget::readFromFile(const QString &fileName)
 //! [7]
 
 //! [6]
-void AddressWidget::writeToFile(const QString &fileName)
+void AddressWidget::writeToFile()
 {
     QFile file(fileName);
 

examples/widgets/itemviews/addressbook/addresswidget.h

@@ -9,6 +9,7 @@
 
 #include <QItemSelection>
 #include <QTabWidget>
+#include <QStandardPaths>
 
 QT_BEGIN_NAMESPACE
 class QSortFilterProxyModel;
@@ -22,8 +23,8 @@ class AddressWidget : public QTabWidget
 
 public:
     AddressWidget(QWidget *parent = nullptr);
-    void readFromFile(const QString &fileName);
-    void writeToFile(const QString &fileName);
+    void readFromFile();
+    void writeToFile();
 
 public slots:
     void showAddEntryDialog();
@@ -37,6 +38,9 @@ signals:
 private:
     void setupTabs();
 
+    inline static QString fileName =
+        QStandardPaths::standardLocations(QStandardPaths::TempLocation).value(0)
+        + QStringLiteral("/addressbook.dat");
     TableModel *table;
     NewAddressTab *newAddressTab;
 };

examples/widgets/itemviews/addressbook/mainwindow.cpp

@@ -28,7 +28,7 @@ void MainWindow::createMenus()
     connect(openAct, &QAction::triggered, this, &MainWindow::openFile);
 //! [1a]
 
-    QAction *saveAct = new QAction(tr("&Save As..."), this);
+    QAction *saveAct = new QAction(tr("&Save"), this);
     fileMenu->addAction(saveAct);
     connect(saveAct, &QAction::triggered, this, &MainWindow::saveFile);
 
@@ -66,18 +66,14 @@ void MainWindow::createMenus()
 //! [2]
 void MainWindow::openFile()
 {
-    QString fileName = QFileDialog::getOpenFileName(this);
-    if (!fileName.isEmpty())
-        addressWidget->readFromFile(fileName);
+    addressWidget->readFromFile();
 }
 //! [2]
 
 //! [3]
 void MainWindow::saveFile()
 {
-    QString fileName = QFileDialog::getSaveFileName(this);
-    if (!fileName.isEmpty())
-        addressWidget->writeToFile(fileName);
+    addressWidget->writeToFile();
 }
 //! [3]