Clean up btchat example

- Replace old connect syntax
- Clean up includes
- Replace 0 with nullptr
- Add socket error handling

Change-Id: Id4c7634db29a23184d3ce2d92ffa39c71505de12
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

9 files changed, 90 insertions, 70 deletions

diff --git a/examples/bluetooth/btchat/chat.cpp b/examples/bluetooth/btchat/chat.cpp
index 9325765e..4cc5f08d 100644
--- a/examples/bluetooth/btchat/chat.cpp
+++ b/examples/bluetooth/btchat/chat.cpp
@@ -53,34 +53,30 @@
 #include "chatserver.h"
 #include "chatclient.h"
 
-#include <qbluetoothuuid.h>
-#include <qbluetoothserver.h>
-#include <qbluetoothservicediscoveryagent.h>
-#include <qbluetoothdeviceinfo.h>
-#include <qbluetoothlocaldevice.h>
+#include <QtCore/qdebug.h>
+
+#include <QtBluetooth/qbluetoothdeviceinfo.h>
+#include <QtBluetooth/qbluetoothlocaldevice.h>
+#include <QtBluetooth/qbluetoothuuid.h>
 
 #ifdef Q_OS_ANDROID
 #include <QtAndroidExtras/QtAndroid>
 #endif
 
-#include <QTimer>
-
-#include <QDebug>
-
 static const QLatin1String serviceUuid("e8e10f95-1a70-4b27-9ccf-02010264e9c8");
 #ifdef Q_OS_ANDROID
 static const QLatin1String reverseUuid("c8e96402-0102-cf9c-274b-701a950fe1e8");
 #endif
 
 Chat::Chat(QWidget *parent)
-    : QDialog(parent),  currentAdapterIndex(0), ui(new Ui_Chat)
+    : QDialog(parent), ui(new Ui_Chat)
 {
     //! [Construct UI]
     ui->setupUi(this);
 
-    connect(ui->quitButton, SIGNAL(clicked()), this, SLOT(accept()));
-    connect(ui->connectButton, SIGNAL(clicked()), this, SLOT(connectClicked()));
-    connect(ui->sendButton, SIGNAL(clicked()), this, SLOT(sendClicked()));
+    connect(ui->quitButton, &QPushButton::clicked, this, &Chat::accept);
+    connect(ui->connectButton, &QPushButton::clicked, this, &Chat::connectClicked);
+    connect(ui->sendButton, &QPushButton::clicked, this, &Chat::sendClicked);
     //! [Construct UI]
 
     localAdapters = QBluetoothLocalDevice::allDevices();
@@ -93,19 +89,21 @@ Chat::Chat(QWidget *parent)
                                   arg(localAdapters.at(0).address().toString()));
         ui->secondAdapter->setText(localAdapters.at(1).address().toString());
         ui->firstAdapter->setChecked(true);
-        connect(ui->firstAdapter, SIGNAL(clicked()), this, SLOT(newAdapterSelected()));
-        connect(ui->secondAdapter, SIGNAL(clicked()), this, SLOT(newAdapterSelected()));
+        connect(ui->firstAdapter, &QRadioButton::clicked, this, &Chat::newAdapterSelected);
+        connect(ui->secondAdapter, &QRadioButton::clicked, this, &Chat::newAdapterSelected);
         QBluetoothLocalDevice adapter(localAdapters.at(0).address());
         adapter.setHostMode(QBluetoothLocalDevice::HostDiscoverable);
     }
 
     //! [Create Chat Server]
     server = new ChatServer(this);
-    connect(server, SIGNAL(clientConnected(QString)), this, SLOT(clientConnected(QString)));
-    connect(server, SIGNAL(clientDisconnected(QString)), this, SLOT(clientDisconnected(QString)));
-    connect(server, SIGNAL(messageReceived(QString,QString)),
-            this, SLOT(showMessage(QString,QString)));
-    connect(this, SIGNAL(sendMessage(QString)), server, SLOT(sendMessage(QString)));
+    connect(server, QOverload<const QString &>::of(&ChatServer::clientConnected),
+            this, &Chat::clientConnected);
+    connect(server, QOverload<const QString &>::of(&ChatServer::clientDisconnected),
+            this,  QOverload<const QString &>::of(&Chat::clientDisconnected));
+    connect(server, &ChatServer::messageReceived,
+            this,  &Chat::showMessage);
+    connect(this, &Chat::sendMessage, server, &ChatServer::sendMessage);
     server->startServer();
     //! [Create Chat Server]
 
@@ -137,6 +135,7 @@ void Chat::connected(const QString &name)
 {
     ui->chat->insertPlainText(QString::fromLatin1("Joined chat with %1.\n").arg(name));
 }
+//! [connected]
 
 void Chat::newAdapterSelected()
 {
@@ -163,7 +162,11 @@ int Chat::adapterFromUserSelection() const
     }
     return result;
 }
-//! [connected]
+
+void Chat::reactOnSocketError(const QString &error)
+{
+    ui->chat->insertPlainText(error);
+}
 
 //! [clientDisconnected]
 void Chat::clientDisconnected()
@@ -206,11 +209,15 @@ void Chat::connectClicked()
         ChatClient *client = new ChatClient(this);
 qDebug() << "Connecting...";
 
-        connect(client, SIGNAL(messageReceived(QString,QString)),
-                this, SLOT(showMessage(QString,QString)));
-        connect(client, SIGNAL(disconnected()), this, SLOT(clientDisconnected()));
-        connect(client, SIGNAL(connected(QString)), this, SLOT(connected(QString)));
-        connect(this, SIGNAL(sendMessage(QString)), client, SLOT(sendMessage(QString)));
+        connect(client, &ChatClient::messageReceived,
+                this, &Chat::showMessage);
+        connect(client, &ChatClient::disconnected,
+                this, QOverload<>::of(&Chat::clientDisconnected));
+        connect(client, QOverload<const QString &>::of(&ChatClient::connected),
+                this, &Chat::connected);
+        connect(client, &ChatClient::socketErrorOccurred,
+                this, &Chat::reactOnSocketError);
+        connect(this, &Chat::sendMessage, client, &ChatClient::sendMessage);
 qDebug() << "Start client";
         client->startClient(service);
 
diff --git a/examples/bluetooth/btchat/chat.h b/examples/bluetooth/btchat/chat.h
index 57f13257..e4c81b24 100644
--- a/examples/bluetooth/btchat/chat.h
+++ b/examples/bluetooth/btchat/chat.h
@@ -50,13 +50,9 @@
 
 #include "ui_chat.h"
 
-#include <QDialog>
+#include <QtWidgets/qdialog.h>
 
-#include <qbluetoothserviceinfo.h>
-#include <qbluetoothsocket.h>
-#include <qbluetoothhostinfo.h>
-
-#include <QDebug>
+#include <QtBluetooth/qbluetoothhostinfo.h>
 
 QT_USE_NAMESPACE
 
@@ -69,7 +65,7 @@ class Chat : public QDialog
     Q_OBJECT
 
 public:
-    Chat(QWidget *parent = 0);
+    explicit Chat(QWidget *parent = nullptr);
     ~Chat();
 
 signals:
@@ -85,12 +81,13 @@ private slots:
     void clientDisconnected(const QString &name);
     void clientDisconnected();
     void connected(const QString &name);
+    void reactOnSocketError(const QString &error);
 
     void newAdapterSelected();
 
 private:
     int adapterFromUserSelection() const;
-    int currentAdapterIndex;
+    int currentAdapterIndex = 0;
     Ui_Chat *ui;
 
     ChatServer *server;
diff --git a/examples/bluetooth/btchat/chatclient.cpp b/examples/bluetooth/btchat/chatclient.cpp
index 6682667f..cf3e2331 100644
--- a/examples/bluetooth/btchat/chatclient.cpp
+++ b/examples/bluetooth/btchat/chatclient.cpp
@@ -50,10 +50,10 @@
 
 #include "chatclient.h"
 
-#include <qbluetoothsocket.h>
+#include <QtCore/qmetaobject.h>
 
 ChatClient::ChatClient(QObject *parent)
-:   QObject(parent), socket(0)
+    :   QObject(parent)
 {
 }
 
@@ -74,9 +74,12 @@ void ChatClient::startClient(const QBluetoothServiceInfo &remoteService)
     socket->connectToService(remoteService);
     qDebug() << "ConnectToService done";
 
-    connect(socket, SIGNAL(readyRead()), this, SLOT(readSocket()));
-    connect(socket, SIGNAL(connected()), this, SLOT(connected()));
-    connect(socket, SIGNAL(disconnected()), this, SIGNAL(disconnected()));
+    connect(socket, &QBluetoothSocket::readyRead, this, &ChatClient::readSocket);
+    connect(socket, &QBluetoothSocket::connected, this, QOverload<>::of(&ChatClient::connected));
+    connect(socket, &QBluetoothSocket::disconnected, this, &ChatClient::disconnected);
+    connect(socket, QOverload<QBluetoothSocket::SocketError>::of(&QBluetoothSocket::error),
+            this, &ChatClient::onSocketErrorOccurred);
+
 }
 //! [startClient]
 
@@ -84,7 +87,7 @@ void ChatClient::startClient(const QBluetoothServiceInfo &remoteService)
 void ChatClient::stopClient()
 {
     delete socket;
-    socket = 0;
+    socket = nullptr;
 }
 //! [stopClient]
 
@@ -110,6 +113,18 @@ void ChatClient::sendMessage(const QString &message)
 }
 //! [sendMessage]
 
+void ChatClient::onSocketErrorOccurred(QBluetoothSocket::SocketError error)
+{
+    if (error == QBluetoothSocket::NoSocketError)
+        return;
+
+    QMetaEnum metaEnum = QMetaEnum::fromType<QBluetoothSocket::SocketError>();
+    QString errorString = socket->peerName() + QLatin1Char(' ')
+            + metaEnum.valueToKey(error) + QLatin1String(" occurred");
+
+    emit socketErrorOccurred(errorString);
+}
+
 //! [connected]
 void ChatClient::connected()
 {
diff --git a/examples/bluetooth/btchat/chatclient.h b/examples/bluetooth/btchat/chatclient.h
index a2f2eafc..25002f90 100644
--- a/examples/bluetooth/btchat/chatclient.h
+++ b/examples/bluetooth/btchat/chatclient.h
@@ -51,9 +51,10 @@
 #ifndef CHATCLIENT_H
 #define CHATCLIENT_H
 
-#include <qbluetoothserviceinfo.h>
+#include <QtCore/qobject.h>
 
-#include <QtCore/QObject>
+#include <QtBluetooth/qbluetoothserviceinfo.h>
+#include <QtBluetooth/qbluetoothsocket.h>
 
 QT_FORWARD_DECLARE_CLASS(QBluetoothSocket)
 
@@ -65,7 +66,7 @@ class ChatClient : public QObject
     Q_OBJECT
 
 public:
-    explicit ChatClient(QObject *parent = 0);
+    explicit ChatClient(QObject *parent = nullptr);
     ~ChatClient();
 
     void startClient(const QBluetoothServiceInfo &remoteService);
@@ -78,13 +79,15 @@ signals:
     void messageReceived(const QString &sender, const QString &message);
     void connected(const QString &name);
     void disconnected();
+    void socketErrorOccurred(const QString &errorString);
 
 private slots:
     void readSocket();
     void connected();
+    void onSocketErrorOccurred(QBluetoothSocket::SocketError);
 
 private:
-    QBluetoothSocket *socket;
+    QBluetoothSocket *socket = nullptr;
 };
 //! [declaration]
 
diff --git a/examples/bluetooth/btchat/chatserver.cpp b/examples/bluetooth/btchat/chatserver.cpp
index 5d59cd77..59210e55 100644
--- a/examples/bluetooth/btchat/chatserver.cpp
+++ b/examples/bluetooth/btchat/chatserver.cpp
@@ -50,16 +50,15 @@
 
 #include "chatserver.h"
 
-#include <qbluetoothserver.h>
-#include <qbluetoothsocket.h>
-#include <qbluetoothlocaldevice.h>
+#include <QtBluetooth/qbluetoothserver.h>
+#include <QtBluetooth/qbluetoothsocket.h>
 
 //! [Service UUID]
 static const QLatin1String serviceUuid("e8e10f95-1a70-4b27-9ccf-02010264e9c8");
 //! [Service UUID]
 
 ChatServer::ChatServer(QObject *parent)
-:   QObject(parent), rfcommServer(0)
+    :   QObject(parent)
 {
 }
 
@@ -75,7 +74,8 @@ void ChatServer::startServer(const QBluetoothAddress& localAdapter)
 
     //! [Create the server]
     rfcommServer = new QBluetoothServer(QBluetoothServiceInfo::RfcommProtocol, this);
-    connect(rfcommServer, SIGNAL(newConnection()), this, SLOT(clientConnected()));
+    connect(rfcommServer, &QBluetoothServer::newConnection,
+            this, QOverload<>::of(&ChatServer::clientConnected));
     bool result = rfcommServer->listen(localAdapter);
     if (!result) {
         qWarning() << "Cannot bind chat server to" << localAdapter.toString();
@@ -145,7 +145,7 @@ void ChatServer::stopServer()
 
     // Close server
     delete rfcommServer;
-    rfcommServer = 0;
+    rfcommServer = nullptr;
 }
 //! [stopServer]
 
@@ -166,8 +166,8 @@ void ChatServer::clientConnected()
     if (!socket)
         return;
 
-    connect(socket, SIGNAL(readyRead()), this, SLOT(readSocket()));
-    connect(socket, SIGNAL(disconnected()), this, SLOT(clientDisconnected()));
+    connect(socket, &QBluetoothSocket::readyRead, this, &ChatServer::readSocket);
+    connect(socket, &QBluetoothSocket::disconnected, this, QOverload<>::of(&ChatServer::clientDisconnected));
     clientSockets.append(socket);
     emit clientConnected(socket->peerName());
 }
diff --git a/examples/bluetooth/btchat/chatserver.h b/examples/bluetooth/btchat/chatserver.h
index f7117b74..c4191db8 100644
--- a/examples/bluetooth/btchat/chatserver.h
+++ b/examples/bluetooth/btchat/chatserver.h
@@ -51,11 +51,10 @@
 #ifndef CHATSERVER_H
 #define CHATSERVER_H
 
-#include <qbluetoothserviceinfo.h>
-#include <qbluetoothaddress.h>
+#include <QtCore/qobject.h>
 
-#include <QtCore/QObject>
-#include <QtCore/QList>
+#include <QtBluetooth/qbluetoothaddress.h>
+#include <QtBluetooth/qbluetoothserviceinfo.h>
 
 QT_FORWARD_DECLARE_CLASS(QBluetoothServer)
 QT_FORWARD_DECLARE_CLASS(QBluetoothSocket)
@@ -68,7 +67,7 @@ class ChatServer : public QObject
     Q_OBJECT
 
 public:
-    explicit ChatServer(QObject *parent = 0);
+    explicit ChatServer(QObject *parent = nullptr);
     ~ChatServer();
 
     void startServer(const QBluetoothAddress &localAdapter = QBluetoothAddress());
@@ -88,7 +87,7 @@ private slots:
     void readSocket();
 
 private:
-    QBluetoothServer *rfcommServer;
+    QBluetoothServer *rfcommServer = nullptr;
     QBluetoothServiceInfo serviceInfo;
     QList<QBluetoothSocket *> clientSockets;
 };
diff --git a/examples/bluetooth/btchat/main.cpp b/examples/bluetooth/btchat/main.cpp
index 84b33ae4..5c7bbf75 100644
--- a/examples/bluetooth/btchat/main.cpp
+++ b/examples/bluetooth/btchat/main.cpp
@@ -50,7 +50,7 @@
 
 #include "chat.h"
 
-#include <QApplication>
+#include <QtWidgets/qapplication.h>
 //#include <QtCore/QLoggingCategory>
 
 int main(int argc, char *argv[])
@@ -59,7 +59,7 @@ int main(int argc, char *argv[])
     QApplication app(argc, argv);
 
     Chat d;
-    QObject::connect(&d, SIGNAL(accepted()), &app, SLOT(quit()));
+    QObject::connect(&d, &Chat::accepted, &app, &QApplication::quit);
 
 #ifdef Q_OS_ANDROID
     d.showMaximized();
diff --git a/examples/bluetooth/btchat/remoteselector.cpp b/examples/bluetooth/btchat/remoteselector.cpp
index c1302f6b..2bd1efcc 100644
--- a/examples/bluetooth/btchat/remoteselector.cpp
+++ b/examples/bluetooth/btchat/remoteselector.cpp
@@ -51,14 +51,13 @@
 #include "remoteselector.h"
 #include "ui_remoteselector.h"
 
-#include <qbluetoothdeviceinfo.h>
-#include <qbluetoothaddress.h>
-#include <qbluetoothlocaldevice.h>
+#include <QtBluetooth/qbluetoothlocaldevice.h>
+#include <QtBluetooth/qbluetoothservicediscoveryagent.h>
 
 QT_USE_NAMESPACE
 
 RemoteSelector::RemoteSelector(const QBluetoothAddress &localAdapter, QWidget *parent)
-:   QDialog(parent), ui(new Ui::RemoteSelector)
+    :   QDialog(parent), ui(new Ui::RemoteSelector)
 {
     ui->setupUi(this);
 
diff --git a/examples/bluetooth/btchat/remoteselector.h b/examples/bluetooth/btchat/remoteselector.h
index 9174cabd..54649ba9 100644
--- a/examples/bluetooth/btchat/remoteselector.h
+++ b/examples/bluetooth/btchat/remoteselector.h
@@ -51,13 +51,13 @@
 #ifndef REMOTESELECTOR_H
 #define REMOTESELECTOR_H
 
-#include <QDialog>
+#include <QtWidgets/qdialog.h>
 
-#include <qbluetoothuuid.h>
-#include <qbluetoothserviceinfo.h>
-#include <qbluetoothservicediscoveryagent.h>
+#include <QtBluetooth/qbluetoothaddress.h>
+#include <QtBluetooth/qbluetoothserviceinfo.h>
+#include <QtBluetooth/qbluetoothuuid.h>
 
-QT_FORWARD_DECLARE_CLASS(QModelIndex)
+QT_FORWARD_DECLARE_CLASS(QBluetoothServiceDiscoveryAgent)
 QT_FORWARD_DECLARE_CLASS(QListWidgetItem)
 
 QT_USE_NAMESPACE
@@ -73,7 +73,7 @@ class RemoteSelector : public QDialog
     Q_OBJECT
 
 public:
-    explicit RemoteSelector(const QBluetoothAddress &localAdapter, QWidget *parent = 0);
+    explicit RemoteSelector(const QBluetoothAddress &localAdapter, QWidget *parent = nullptr);
     ~RemoteSelector();
 
     void startDiscovery(const QBluetoothUuid &uuid);