Documentation: Port code snippets to new connection syntax

Task-number: PYSIDE-2182
Change-Id: I5f800cf3a4a7afefbc36a79372fc35449fa953f0
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
(cherry picked from commit 8fccba0e63f9484866398e77a7e8ee54ed80a0a2)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/corelib/doc/snippets/code/src_corelib_kernel_qtimer.cpp

@@ -8,7 +8,7 @@
 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);
-    QTimer::singleShot(600000, &app, SLOT(quit()));
+    QTimer::singleShot(600000, &app, QCoreApplication::quit);
     ...
     return app.exec();
 }

src/gui/doc/snippets/code/src_gui_kernel_qkeysequence.cpp

@@ -32,7 +32,7 @@ void Wrapper::wrapper() {
 //! [2]
 QMenu *file = new QMenu(this);
 file->addAction(tr("&Open..."), QKeySequence(tr("Ctrl+O", "File|Open")),
-                this, SLOT(open()));
+                this, &MainWindow::open);
 //! [2]
 
 } // Wrapper::wrapper

src/gui/doc/snippets/textdocument-listitems/mainwindow.cpp

@@ -13,17 +13,17 @@ MainWindow::MainWindow()
     QMenu *fileMenu = new QMenu(tr("&File"));
 
     fileMenu->addAction(tr("E&xit"), QKeySequence(tr("Ctrl+Q", "File|Exit")),
-                        this, SLOT(close()));
+                        this, &QWidget::close);
 
     QMenu *actionsMenu = new QMenu(tr("&Actions"));
     actionsMenu->addAction(tr("&Highlight List Items"),
-                        this, SLOT(highlightListItems()));
+                        this, &MainWindow::highlightListItems);
-    actionsMenu->addAction(tr("&Show Current List"), this, SLOT(showList()));
+    actionsMenu->addAction(tr("&Show Current List"), this, &MainWindow::showList);
 
     QMenu *insertMenu = new QMenu(tr("&Insert"));
 
     insertMenu->addAction(tr("&List"), QKeySequence(tr("Ctrl+L", "Insert|List")),
-                          this, SLOT(insertList()));
+                          this, &MainWindow::insertList);
 
     menuBar()->addMenu(fileMenu);
     menuBar()->addMenu(insertMenu);

src/gui/doc/snippets/textdocument-selections/mainwindow.cpp

@@ -9,30 +9,30 @@ MainWindow::MainWindow()
     QMenu *fileMenu = new QMenu(tr("&File"));
 
     fileMenu->addAction(tr("&Open..."), QKeySequence(tr("Ctrl+O", "File|Open")),
-                        this, SLOT(openFile()));
+                        this, &MainWindow::openFile);
 
-    QAction *quitAction = fileMenu->addAction(tr("E&xit"), this, SLOT(close()));
+    QAction *quitAction = fileMenu->addAction(tr("E&xit"), this, &MainWindow::close);
     quitAction->setShortcut(tr("Ctrl+Q"));
 
     QMenu *editMenu = new QMenu(tr("&Edit"));
 
-    cutAction = editMenu->addAction(tr("Cu&t"), this, SLOT(cutSelection()));
+    cutAction = editMenu->addAction(tr("Cu&t"), this, &MainWindow::cutSelection);
     cutAction->setShortcut(tr("Ctrl+X"));
     cutAction->setEnabled(false);
 
-    copyAction = editMenu->addAction(tr("&Copy"), this, SLOT(copySelection()));
+    copyAction = editMenu->addAction(tr("&Copy"), this, &MainWindow::copySelection);
     copyAction->setShortcut(tr("Ctrl+C"));
     copyAction->setEnabled(false);
 
-    pasteAction = editMenu->addAction(tr("&Paste"), this, SLOT(pasteSelection()));
+    pasteAction = editMenu->addAction(tr("&Paste"), this, &MainWindow::pasteSelection);
     pasteAction->setShortcut(tr("Ctrl+V"));
     pasteAction->setEnabled(false);
 
     QMenu *selectMenu = new QMenu(tr("&Select"));
-    selectMenu->addAction(tr("&Word"), this, SLOT(selectWord()));
+    selectMenu->addAction(tr("&Word"), this, &MainWindow::selectWord);
-    selectMenu->addAction(tr("&Line"), this, SLOT(selectLine()));
+    selectMenu->addAction(tr("&Line"), this, &MainWindow::selectLine);
-    selectMenu->addAction(tr("&Block"), this, SLOT(selectBlock()));
+    selectMenu->addAction(tr("&Block"), this, &MainWindow::selectBlock);
-    selectMenu->addAction(tr("&Frame"), this, SLOT(selectFrame()));
+    selectMenu->addAction(tr("&Frame"), this, &MainWindow::selectFrame);
 
     menuBar()->addMenu(fileMenu);
     menuBar()->addMenu(editMenu);

src/network/doc/snippets/code/src_network_kernel_qdnslookup.cpp

@@ -6,8 +6,7 @@ void MyObject::lookupServers()
 {
     // Create a DNS lookup.
     dns = new QDnsLookup(this);
-    connect(dns, SIGNAL(finished()),
+    connect(dns, &QDnsLookup::finished, this, &MyObject::handleServers);
-            this, SLOT(handleServers()));
 
     // Find the XMPP servers for gmail.com
     dns->setType(QDnsLookup::SRV);

src/network/doc/snippets/code/src_network_kernel_qhostinfo.cpp

@@ -3,12 +3,10 @@
 
 //! [0]
 // To find the IP address of qt-project.org
-QHostInfo::lookupHost("qt-project.org",
+QHostInfo::lookupHost("qt-project.org", this, &MyWidget::printResults);
-                      this, SLOT(printResults(QHostInfo)));
 
 // To find the host name for 4.2.2.1
-QHostInfo::lookupHost("4.2.2.1",
+QHostInfo::lookupHost("4.2.2.1", this, &MyWidget::printResults);
-                      this, SLOT(printResults(QHostInfo)));
 //! [0]
 
 
@@ -18,8 +16,7 @@ QHostInfo info = QHostInfo::fromName("qt-project.org");
 
 
 //! [2]
-QHostInfo::lookupHost("www.kde.org",
+QHostInfo::lookupHost("www.kde.org", this, &MyWidget::lookedUp);
-                      this, SLOT(lookedUp(QHostInfo)));
 //! [2]
 
 
@@ -39,8 +36,7 @@ void MyWidget::lookedUp(const QHostInfo &host)
 
 
 //! [4]
-QHostInfo::lookupHost("4.2.2.1",
+QHostInfo::lookupHost("4.2.2.1", this, &MyWidget::lookedUp);
-                      this, SLOT(lookedUp(QHostInfo)));
 //! [4]
 
 

src/network/doc/snippets/code/src_network_ssl_qsslsocket.cpp

@@ -5,7 +5,7 @@ using namespace Qt::StringLiterals;
 
 //! [0]
 QSslSocket *socket = new QSslSocket(this);
-connect(socket, SIGNAL(encrypted()), this, SLOT(ready()));
+connect(socket, &QSslSocket::encrypted, this, &Receiver::ready);
 
 socket->connectToHostEncrypted("imap.example.com", 993);
 //! [0]
@@ -42,7 +42,7 @@ while (socket.waitForReadyRead())
 
 //! [3]
 QSslSocket socket;
-connect(&socket, SIGNAL(encrypted()), receiver, SLOT(socketEncrypted()));
+connect(&socket, &QSslSocket::encrypted, receiver, &Receiver::socketEncrypted);
 
 socket.connectToHostEncrypted("imap", 993);
 socket->write("1 CAPABILITY\r\n");