Merge #13529: Use new Qt5 connect syntax

3567b247f43decb6fc102d5b0989d1746fce0441 test: Add lint to prevent SIGNAL/SLOT connect style (João Barbosa)
f78558f1e39198779bdb17e2b0e256fb99ad4b28 qt: Use new Qt5 connect syntax (João Barbosa)

Pull request description:

  Pros&cons in https://wiki.qt.io/New_Signal_Slot_Syntax.

  Note that connecting to/from overloaded slot/signal is ugly before qt 5.7 (see https://stackoverflow.com/a/16795664).

Tree-SHA512: ab81f035099fecd34be546f7091bc29595349f2fd0fea26f6414242702955fca27faa4fe19ebfe105c01217908b51db762cb5a9f6ce25bc5e8e6f64c77428c22

34 files changed, 324 insertions, 304 deletions

diff --git a/src/qt/addressbookpage.cpp b/src/qt/addressbookpage.cpp
index e1d9b1addf..26bdf60d4a 100644
--- a/src/qt/addressbookpage.cpp
+++ b/src/qt/addressbookpage.cpp
@@ -85,7 +85,7 @@ AddressBookPage::AddressBookPage(const PlatformStyle *platformStyle, Mode _mode,
         case SendingTab: setWindowTitle(tr("Choose the address to send coins to")); break;
         case ReceivingTab: setWindowTitle(tr("Choose the address to receive coins with")); break;
         }
-        connect(ui->tableView, SIGNAL(doubleClicked(QModelIndex)), this, SLOT(accept()));
+        connect(ui->tableView, &QTableView::doubleClicked, this, &QDialog::accept);
         ui->tableView->setEditTriggers(QAbstractItemView::NoEditTriggers);
         ui->tableView->setFocus();
         ui->closeButton->setText(tr("C&hoose"));
@@ -129,14 +129,14 @@ AddressBookPage::AddressBookPage(const PlatformStyle *platformStyle, Mode _mode,
     contextMenu->addSeparator();
 
     // Connect signals for context menu actions
-    connect(copyAddressAction, SIGNAL(triggered()), this, SLOT(on_copyAddress_clicked()));
-    connect(copyLabelAction, SIGNAL(triggered()), this, SLOT(onCopyLabelAction()));
-    connect(editAction, SIGNAL(triggered()), this, SLOT(onEditAction()));
-    connect(deleteAction, SIGNAL(triggered()), this, SLOT(on_deleteAddress_clicked()));
+    connect(copyAddressAction, &QAction::triggered, this, &AddressBookPage::on_copyAddress_clicked);
+    connect(copyLabelAction, &QAction::triggered, this, &AddressBookPage::onCopyLabelAction);
+    connect(editAction, &QAction::triggered, this, &AddressBookPage::onEditAction);
+    connect(deleteAction, &QAction::triggered, this, &AddressBookPage::on_deleteAddress_clicked);
 
-    connect(ui->tableView, SIGNAL(customContextMenuRequested(QPoint)), this, SLOT(contextualMenu(QPoint)));
+    connect(ui->tableView, &QWidget::customContextMenuRequested, this, &AddressBookPage::contextualMenu);
 
-    connect(ui->closeButton, SIGNAL(clicked()), this, SLOT(accept()));
+    connect(ui->closeButton, &QPushButton::clicked, this, &QDialog::accept);
 }
 
 AddressBookPage::~AddressBookPage()
@@ -154,7 +154,7 @@ void AddressBookPage::setModel(AddressTableModel *_model)
     proxyModel = new AddressBookSortFilterProxyModel(type, this);
     proxyModel->setSourceModel(_model);
 
-    connect(ui->searchLineEdit, SIGNAL(textChanged(QString)), proxyModel, SLOT(setFilterWildcard(QString)));
+    connect(ui->searchLineEdit, &QLineEdit::textChanged, proxyModel, &QSortFilterProxyModel::setFilterWildcard);
 
     ui->tableView->setModel(proxyModel);
     ui->tableView->sortByColumn(0, Qt::AscendingOrder);
@@ -163,11 +163,11 @@ void AddressBookPage::setModel(AddressTableModel *_model)
     ui->tableView->horizontalHeader()->setSectionResizeMode(AddressTableModel::Label, QHeaderView::Stretch);
     ui->tableView->horizontalHeader()->setSectionResizeMode(AddressTableModel::Address, QHeaderView::ResizeToContents);
 
-    connect(ui->tableView->selectionModel(), SIGNAL(selectionChanged(QItemSelection,QItemSelection)),
-        this, SLOT(selectionChanged()));
+    connect(ui->tableView->selectionModel(), &QItemSelectionModel::selectionChanged,
+        this, &AddressBookPage::selectionChanged);
 
     // Select row for newly created address
-    connect(_model, SIGNAL(rowsInserted(QModelIndex,int,int)), this, SLOT(selectNewAddress(QModelIndex,int,int)));
+    connect(_model, &AddressTableModel::rowsInserted, this, &AddressBookPage::selectNewAddress);
 
     selectionChanged();
 }
diff --git a/src/qt/askpassphrasedialog.cpp b/src/qt/askpassphrasedialog.cpp
index 812d2251e1..673f63a19b 100644
--- a/src/qt/askpassphrasedialog.cpp
+++ b/src/qt/askpassphrasedialog.cpp
@@ -70,10 +70,10 @@ AskPassphraseDialog::AskPassphraseDialog(Mode _mode, QWidget *parent) :
             break;
     }
     textChanged();
-    connect(ui->toggleShowPasswordButton, SIGNAL(toggled(bool)), this, SLOT(toggleShowPassword(bool)));
-    connect(ui->passEdit1, SIGNAL(textChanged(QString)), this, SLOT(textChanged()));
-    connect(ui->passEdit2, SIGNAL(textChanged(QString)), this, SLOT(textChanged()));
-    connect(ui->passEdit3, SIGNAL(textChanged(QString)), this, SLOT(textChanged()));
+    connect(ui->toggleShowPasswordButton, &QPushButton::toggled, this, &AskPassphraseDialog::toggleShowPassword);
+    connect(ui->passEdit1, &QLineEdit::textChanged, this, &AskPassphraseDialog::textChanged);
+    connect(ui->passEdit2, &QLineEdit::textChanged, this, &AskPassphraseDialog::textChanged);
+    connect(ui->passEdit3, &QLineEdit::textChanged, this, &AskPassphraseDialog::textChanged);
 }
 
 AskPassphraseDialog::~AskPassphraseDialog()
diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index d3ec67e441..85fb88d338 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -353,7 +353,7 @@ void BitcoinApplication::createWindow(const NetworkStyle *networkStyle)
     window = new BitcoinGUI(m_node, platformStyle, networkStyle, 0);
 
     pollShutdownTimer = new QTimer(window);
-    connect(pollShutdownTimer, SIGNAL(timeout()), window, SLOT(detectShutdown()));
+    connect(pollShutdownTimer, &QTimer::timeout, window, &BitcoinGUI::detectShutdown);
 }
 
 void BitcoinApplication::createSplashScreen(const NetworkStyle *networkStyle)
@@ -362,8 +362,8 @@ void BitcoinApplication::createSplashScreen(const NetworkStyle *networkStyle)
     // We don't hold a direct pointer to the splash screen after creation, but the splash
     // screen will take care of deleting itself when slotFinish happens.
     splash->show();
-    connect(this, SIGNAL(splashFinished(QWidget*)), splash, SLOT(slotFinish(QWidget*)));
-    connect(this, SIGNAL(requestedShutdown()), splash, SLOT(close()));
+    connect(this, &BitcoinApplication::splashFinished, splash, &SplashScreen::slotFinish);
+    connect(this, &BitcoinApplication::requestedShutdown, splash, &QWidget::close);
 }
 
 void BitcoinApplication::startThread()
@@ -375,14 +375,14 @@ void BitcoinApplication::startThread()
     executor->moveToThread(coreThread);
 
     /*  communication to and from thread */
-    connect(executor, SIGNAL(initializeResult(bool)), this, SLOT(initializeResult(bool)));
-    connect(executor, SIGNAL(shutdownResult()), this, SLOT(shutdownResult()));
-    connect(executor, SIGNAL(runawayException(QString)), this, SLOT(handleRunawayException(QString)));
-    connect(this, SIGNAL(requestedInitialize()), executor, SLOT(initialize()));
-    connect(this, SIGNAL(requestedShutdown()), executor, SLOT(shutdown()));
+    connect(executor, &BitcoinCore::initializeResult, this, &BitcoinApplication::initializeResult);
+    connect(executor, &BitcoinCore::shutdownResult, this, &BitcoinApplication::shutdownResult);
+    connect(executor, &BitcoinCore::runawayException, this, &BitcoinApplication::handleRunawayException);
+    connect(this, &BitcoinApplication::requestedInitialize, executor, &BitcoinCore::initialize);
+    connect(this, &BitcoinApplication::requestedShutdown, executor, &BitcoinCore::shutdown);
     /*  make sure executor object is deleted in its own thread */
-    connect(this, SIGNAL(stopThread()), executor, SLOT(deleteLater()));
-    connect(this, SIGNAL(stopThread()), coreThread, SLOT(quit()));
+    connect(this, &BitcoinApplication::stopThread, executor, &QObject::deleteLater);
+    connect(this, &BitcoinApplication::stopThread, coreThread, &QThread::quit);
 
     coreThread->start();
 }
@@ -442,9 +442,9 @@ void BitcoinApplication::addWallet(WalletModel* walletModel)
         window->setCurrentWallet(walletModel->getWalletName());
     }
 
-    connect(walletModel, SIGNAL(coinsSent(WalletModel*, SendCoinsRecipient, QByteArray)),
-        paymentServer, SLOT(fetchPaymentACK(WalletModel*, const SendCoinsRecipient&, QByteArray)));
-    connect(walletModel, SIGNAL(unload()), this, SLOT(removeWallet()));
+    connect(walletModel, &WalletModel::coinsSent,
+        paymentServer, &PaymentServer::fetchPaymentACK);
+    connect(walletModel, &WalletModel::unload, this, &BitcoinApplication::removeWallet);
 
     m_wallet_models.push_back(walletModel);
 #endif
@@ -504,13 +504,12 @@ void BitcoinApplication::initializeResult(bool success)
 #ifdef ENABLE_WALLET
         // Now that initialization/startup is done, process any command-line
         // bitcoin: URIs or payment requests:
-        connect(paymentServer, SIGNAL(receivedPaymentRequest(SendCoinsRecipient)),
-                         window, SLOT(handlePaymentRequest(SendCoinsRecipient)));
-        connect(window, SIGNAL(receivedURI(QString)),
-                         paymentServer, SLOT(handleURIOrFile(QString)));
-        connect(paymentServer, SIGNAL(message(QString,QString,unsigned int)),
-                         window, SLOT(message(QString,QString,unsigned int)));
-        QTimer::singleShot(100, paymentServer, SLOT(uiReady()));
+        connect(paymentServer, &PaymentServer::receivedPaymentRequest, window, &BitcoinGUI::handlePaymentRequest);
+        connect(window, &BitcoinGUI::receivedURI, paymentServer, &PaymentServer::handleURIOrFile);
+        connect(paymentServer, &PaymentServer::message, [this](const QString& title, const QString& message, unsigned int style) {
+            window->message(title, message, style);
+        });
+        QTimer::singleShot(100, paymentServer, &PaymentServer::uiReady);
 #endif
         pollShutdownTimer->start(200);
     } else {
diff --git a/src/qt/bitcoinamountfield.cpp b/src/qt/bitcoinamountfield.cpp
index 6726019a3f..b68f3a439b 100644
--- a/src/qt/bitcoinamountfield.cpp
+++ b/src/qt/bitcoinamountfield.cpp
@@ -29,7 +29,7 @@ public:
     {
         setAlignment(Qt::AlignRight);
 
-        connect(lineEdit(), SIGNAL(textEdited(QString)), this, SIGNAL(valueChanged()));
+        connect(lineEdit(), &QLineEdit::textEdited, this, &AmountSpinBox::valueChanged);
     }
 
     QValidator::State validate(QString &text, int &pos) const
@@ -213,8 +213,8 @@ BitcoinAmountField::BitcoinAmountField(QWidget *parent) :
     setFocusProxy(amount);
 
     // If one if the widgets changes, the combined content changes as well
-    connect(amount, SIGNAL(valueChanged()), this, SIGNAL(valueChanged()));
-    connect(unit, SIGNAL(currentIndexChanged(int)), this, SLOT(unitChanged(int)));
+    connect(amount, &AmountSpinBox::valueChanged, this, &BitcoinAmountField::valueChanged);
+    connect(unit, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), this, &BitcoinAmountField::unitChanged);
 
     // Set default based on configuration
     unitChanged(unit->currentIndex());
diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
index ff0641dcf5..cefa9004ed 100644
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -203,9 +203,9 @@ BitcoinGUI::BitcoinGUI(interfaces::Node& node, const PlatformStyle *_platformSty
     modalOverlay = new ModalOverlay(this->centralWidget());
 #ifdef ENABLE_WALLET
     if(enableWallet) {
-        connect(walletFrame, SIGNAL(requestedSyncWarningInfo()), this, SLOT(showModalOverlay()));
-        connect(labelBlocksIcon, SIGNAL(clicked(QPoint)), this, SLOT(showModalOverlay()));
-        connect(progressBar, SIGNAL(clicked(QPoint)), this, SLOT(showModalOverlay()));
+        connect(walletFrame, &WalletFrame::requestedSyncWarningInfo, this, &BitcoinGUI::showModalOverlay);
+        connect(labelBlocksIcon, &GUIUtil::ClickableLabel::clicked, this, &BitcoinGUI::showModalOverlay);
+        connect(progressBar, &GUIUtil::ClickableProgressBar::clicked, this, &BitcoinGUI::showModalOverlay);
     }
 #endif
 }
@@ -270,18 +270,18 @@ void BitcoinGUI::createActions()
 #ifdef ENABLE_WALLET
     // These showNormalIfMinimized are needed because Send Coins and Receive Coins
     // can be triggered from the tray menu, and need to show the GUI to be useful.
-    connect(overviewAction, SIGNAL(triggered()), this, SLOT(showNormalIfMinimized()));
-    connect(overviewAction, SIGNAL(triggered()), this, SLOT(gotoOverviewPage()));
-    connect(sendCoinsAction, SIGNAL(triggered()), this, SLOT(showNormalIfMinimized()));
-    connect(sendCoinsAction, SIGNAL(triggered()), this, SLOT(gotoSendCoinsPage()));
-    connect(sendCoinsMenuAction, SIGNAL(triggered()), this, SLOT(showNormalIfMinimized()));
-    connect(sendCoinsMenuAction, SIGNAL(triggered()), this, SLOT(gotoSendCoinsPage()));
-    connect(receiveCoinsAction, SIGNAL(triggered()), this, SLOT(showNormalIfMinimized()));
-    connect(receiveCoinsAction, SIGNAL(triggered()), this, SLOT(gotoReceiveCoinsPage()));
-    connect(receiveCoinsMenuAction, SIGNAL(triggered()), this, SLOT(showNormalIfMinimized()));
-    connect(receiveCoinsMenuAction, SIGNAL(triggered()), this, SLOT(gotoReceiveCoinsPage()));
-    connect(historyAction, SIGNAL(triggered()), this, SLOT(showNormalIfMinimized()));
-    connect(historyAction, SIGNAL(triggered()), this, SLOT(gotoHistoryPage()));
+    connect(overviewAction, &QAction::triggered, this, static_cast<void (BitcoinGUI::*)()>(&BitcoinGUI::showNormalIfMinimized));
+    connect(overviewAction, &QAction::triggered, this, &BitcoinGUI::gotoOverviewPage);
+    connect(sendCoinsAction, &QAction::triggered, this, static_cast<void (BitcoinGUI::*)()>(&BitcoinGUI::showNormalIfMinimized));
+    connect(sendCoinsAction, &QAction::triggered, [this]{ gotoSendCoinsPage(); });
+    connect(sendCoinsMenuAction, &QAction::triggered, this, static_cast<void (BitcoinGUI::*)()>(&BitcoinGUI::showNormalIfMinimized));
+    connect(sendCoinsMenuAction, &QAction::triggered, [this]{ gotoSendCoinsPage(); });
+    connect(receiveCoinsAction, &QAction::triggered, this, static_cast<void (BitcoinGUI::*)()>(&BitcoinGUI::showNormalIfMinimized));
+    connect(receiveCoinsAction, &QAction::triggered, this, &BitcoinGUI::gotoReceiveCoinsPage);
+    connect(receiveCoinsMenuAction, &QAction::triggered, this, static_cast<void (BitcoinGUI::*)()>(&BitcoinGUI::showNormalIfMinimized));
+    connect(receiveCoinsMenuAction, &QAction::triggered, this, &BitcoinGUI::gotoReceiveCoinsPage);
+    connect(historyAction, &QAction::triggered, this, static_cast<void (BitcoinGUI::*)()>(&BitcoinGUI::showNormalIfMinimized));
+    connect(historyAction, &QAction::triggered, this, &BitcoinGUI::gotoHistoryPage);
 #endif // ENABLE_WALLET
 
     quitAction = new QAction(platformStyle->TextColorIcon(":/icons/quit"), tr("E&xit"), this);
@@ -331,32 +331,32 @@ void BitcoinGUI::createActions()
     showHelpMessageAction->setMenuRole(QAction::NoRole);
     showHelpMessageAction->setStatusTip(tr("Show the %1 help message to get a list with possible Bitcoin command-line options").arg(tr(PACKAGE_NAME)));
 
-    connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
-    connect(aboutAction, SIGNAL(triggered()), this, SLOT(aboutClicked()));
-    connect(aboutQtAction, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
-    connect(optionsAction, SIGNAL(triggered()), this, SLOT(optionsClicked()));
-    connect(toggleHideAction, SIGNAL(triggered()), this, SLOT(toggleHidden()));
-    connect(showHelpMessageAction, SIGNAL(triggered()), this, SLOT(showHelpMessageClicked()));
-    connect(openRPCConsoleAction, SIGNAL(triggered()), this, SLOT(showDebugWindow()));
+    connect(quitAction, &QAction::triggered, qApp, QApplication::quit);
+    connect(aboutAction, &QAction::triggered, this, &BitcoinGUI::aboutClicked);
+    connect(aboutQtAction, &QAction::triggered, qApp, QApplication::aboutQt);
+    connect(optionsAction, &QAction::triggered, this, &BitcoinGUI::optionsClicked);
+    connect(toggleHideAction, &QAction::triggered, this, &BitcoinGUI::toggleHidden);
+    connect(showHelpMessageAction, &QAction::triggered, this, &BitcoinGUI::showHelpMessageClicked);
+    connect(openRPCConsoleAction, &QAction::triggered, this, &BitcoinGUI::showDebugWindow);
     // prevents an open debug window from becoming stuck/unusable on client shutdown
-    connect(quitAction, SIGNAL(triggered()), rpcConsole, SLOT(hide()));
+    connect(quitAction, &QAction::triggered, rpcConsole, &QWidget::hide);
 
 #ifdef ENABLE_WALLET
     if(walletFrame)
     {
-        connect(encryptWalletAction, SIGNAL(triggered(bool)), walletFrame, SLOT(encryptWallet(bool)));
-        connect(backupWalletAction, SIGNAL(triggered()), walletFrame, SLOT(backupWallet()));
-        connect(changePassphraseAction, SIGNAL(triggered()), walletFrame, SLOT(changePassphrase()));
-        connect(signMessageAction, SIGNAL(triggered()), this, SLOT(gotoSignMessageTab()));
-        connect(verifyMessageAction, SIGNAL(triggered()), this, SLOT(gotoVerifyMessageTab()));
-        connect(usedSendingAddressesAction, SIGNAL(triggered()), walletFrame, SLOT(usedSendingAddresses()));
-        connect(usedReceivingAddressesAction, SIGNAL(triggered()), walletFrame, SLOT(usedReceivingAddresses()));
-        connect(openAction, SIGNAL(triggered()), this, SLOT(openClicked()));
+        connect(encryptWalletAction, &QAction::triggered, walletFrame, &WalletFrame::encryptWallet);
+        connect(backupWalletAction, &QAction::triggered, walletFrame, &WalletFrame::backupWallet);
+        connect(changePassphraseAction, &QAction::triggered, walletFrame, &WalletFrame::changePassphrase);
+        connect(signMessageAction, &QAction::triggered, [this]{ gotoSignMessageTab(); });
+        connect(verifyMessageAction, &QAction::triggered, [this]{ gotoVerifyMessageTab(); });
+        connect(usedSendingAddressesAction, &QAction::triggered, walletFrame, &WalletFrame::usedSendingAddresses);
+        connect(usedReceivingAddressesAction, &QAction::triggered, walletFrame, &WalletFrame::usedReceivingAddresses);
+        connect(openAction, &QAction::triggered, this, &BitcoinGUI::openClicked);
     }
 #endif // ENABLE_WALLET
 
-    new QShortcut(QKeySequence(Qt::CTRL + Qt::SHIFT + Qt::Key_C), this, SLOT(showDebugWindowActivateConsole()));
-    new QShortcut(QKeySequence(Qt::CTRL + Qt::SHIFT + Qt::Key_D), this, SLOT(showDebugWindow()));
+    connect(new QShortcut(QKeySequence(Qt::CTRL + Qt::SHIFT + Qt::Key_C), this), &QShortcut::activated, this, &BitcoinGUI::showDebugWindowActivateConsole);
+    connect(new QShortcut(QKeySequence(Qt::CTRL + Qt::SHIFT + Qt::Key_D), this), &QShortcut::activated, this, &BitcoinGUI::showDebugWindow);
 }
 
 void BitcoinGUI::createMenuBar()
@@ -425,7 +425,7 @@ void BitcoinGUI::createToolBars()
         toolbar->addWidget(spacer);
 
         m_wallet_selector = new QComboBox();
-        connect(m_wallet_selector, SIGNAL(currentIndexChanged(int)), this, SLOT(setCurrentWalletBySelectorIndex(int)));
+        connect(m_wallet_selector, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), this, &BitcoinGUI::setCurrentWalletBySelectorIndex);
 
         m_wallet_selector_label = new QLabel();
         m_wallet_selector_label->setText(tr("Wallet:") + " ");
@@ -451,18 +451,20 @@ void BitcoinGUI::setClientModel(ClientModel *_clientModel)
 
         // Keep up to date with client
         updateNetworkState();
-        connect(_clientModel, SIGNAL(numConnectionsChanged(int)), this, SLOT(setNumConnections(int)));
-        connect(_clientModel, SIGNAL(networkActiveChanged(bool)), this, SLOT(setNetworkActive(bool)));
+        connect(_clientModel, &ClientModel::numConnectionsChanged, this, &BitcoinGUI::setNumConnections);
+        connect(_clientModel, &ClientModel::networkActiveChanged, this, &BitcoinGUI::setNetworkActive);
 
         modalOverlay->setKnownBestHeight(_clientModel->getHeaderTipHeight(), QDateTime::fromTime_t(_clientModel->getHeaderTipTime()));
         setNumBlocks(m_node.getNumBlocks(), QDateTime::fromTime_t(m_node.getLastBlockTime()), m_node.getVerificationProgress(), false);
-        connect(_clientModel, SIGNAL(numBlocksChanged(int,QDateTime,double,bool)), this, SLOT(setNumBlocks(int,QDateTime,double,bool)));
+        connect(_clientModel, &ClientModel::numBlocksChanged, this, &BitcoinGUI::setNumBlocks);
 
         // Receive and report messages from client model
-        connect(_clientModel, SIGNAL(message(QString,QString,unsigned int)), this, SLOT(message(QString,QString,unsigned int)));
+        connect(_clientModel, &ClientModel::message, [this](const QString &title, const QString &message, unsigned int style){
+            this->message(title, message, style);
+        });
 
         // Show progress dialog
-        connect(_clientModel, SIGNAL(showProgress(QString,int)), this, SLOT(showProgress(QString,int)));
+        connect(_clientModel, &ClientModel::showProgress, this, &BitcoinGUI::showProgress);
 
         rpcConsole->setClientModel(_clientModel);
 
@@ -480,7 +482,7 @@ void BitcoinGUI::setClientModel(ClientModel *_clientModel)
         if(optionsModel)
         {
             // be aware of the tray icon disable state change reported by the OptionsModel object.
-            connect(optionsModel,SIGNAL(hideTrayIconChanged(bool)),this,SLOT(setTrayIconVisible(bool)));
+            connect(optionsModel, &OptionsModel::hideTrayIconChanged, this, &BitcoinGUI::setTrayIconVisible);
 
             // initialize the disable state of the tray icon with the current value in the model.
             setTrayIconVisible(optionsModel->getHideTrayIcon());
@@ -601,8 +603,7 @@ void BitcoinGUI::createTrayIconMenu()
     trayIconMenu = new QMenu(this);
     trayIcon->setContextMenu(trayIconMenu);
 
-    connect(trayIcon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)),
-            this, SLOT(trayIconActivated(QSystemTrayIcon::ActivationReason)));
+    connect(trayIcon, &QSystemTrayIcon::activated, this, &BitcoinGUI::trayIconActivated);
 #else
     // Note: On Mac, the dock icon is used to provide the tray's functionality.
     MacDockIconHandler *dockIconHandler = MacDockIconHandler::instance();
@@ -956,12 +957,12 @@ void BitcoinGUI::changeEvent(QEvent *e)
             QWindowStateChangeEvent *wsevt = static_cast<QWindowStateChangeEvent*>(e);
             if(!(wsevt->oldState() & Qt::WindowMinimized) && isMinimized())
             {
-                QTimer::singleShot(0, this, SLOT(hide()));
+                QTimer::singleShot(0, this, &BitcoinGUI::hide);
                 e->ignore();
             }
             else if((wsevt->oldState() & Qt::WindowMinimized) && !isMinimized())
             {
-                QTimer::singleShot(0, this, SLOT(show()));
+                QTimer::singleShot(0, this, &BitcoinGUI::show);
                 e->ignore();
             }
         }
@@ -1276,7 +1277,7 @@ void UnitDisplayStatusBarControl::createContextMenu()
         menuAction->setData(QVariant(u));
         menu->addAction(menuAction);
     }
-    connect(menu,SIGNAL(triggered(QAction*)),this,SLOT(onMenuSelection(QAction*)));
+    connect(menu, &QMenu::triggered, this, &UnitDisplayStatusBarControl::onMenuSelection);
 }
 
 /** Lets the control know about the Options Model (and its signals) */
@@ -1287,7 +1288,7 @@ void UnitDisplayStatusBarControl::setOptionsModel(OptionsModel *_optionsModel)
         this->optionsModel = _optionsModel;
 
         // be aware of a display unit change reported by the OptionsModel object.
-        connect(_optionsModel,SIGNAL(displayUnitChanged(int)),this,SLOT(updateDisplayUnit(int)));
+        connect(_optionsModel, &OptionsModel::displayUnitChanged, this, &UnitDisplayStatusBarControl::updateDisplayUnit);
 
         // initialize the display units label with the current value in the model.
         updateDisplayUnit(_optionsModel->getDisplayUnit());
diff --git a/src/qt/bitcoingui.h b/src/qt/bitcoingui.h
index 3a8ef3ad8c..61cd6f76cc 100644
--- a/src/qt/bitcoingui.h
+++ b/src/qt/bitcoingui.h
@@ -49,6 +49,7 @@ QT_END_NAMESPACE
 
 namespace GUIUtil {
 class ClickableLabel;
+class ClickableProgressBar;
 }
 
 /**
@@ -101,9 +102,9 @@ private:
     QLabel* labelWalletHDStatusIcon = nullptr;
     GUIUtil::ClickableLabel* labelProxyIcon = nullptr;
     GUIUtil::ClickableLabel* connectionsControl = nullptr;
-    QLabel* labelBlocksIcon = nullptr;
+    GUIUtil::ClickableLabel* labelBlocksIcon = nullptr;
     QLabel* progressBarLabel = nullptr;
-    QProgressBar* progressBar = nullptr;
+    GUIUtil::ClickableProgressBar* progressBar = nullptr;
     QProgressDialog* progressDialog = nullptr;
 
     QMenuBar* appMenuBar = nullptr;
@@ -227,7 +228,7 @@ private:
     /** Set the proxy-enabled icon as shown in the UI. */
     void updateProxyIcon();
 
-private Q_SLOTS:
+public Q_SLOTS:
 #ifdef ENABLE_WALLET
     /** Switch to overview (home) page */
     void gotoOverviewPage();
@@ -262,7 +263,8 @@ private Q_SLOTS:
 #endif
 
     /** Show window if hidden, unminimize when minimized, rise when obscured or show if hidden and fToggleHidden is true */
-    void showNormalIfMinimized(bool fToggleHidden = false);
+    void showNormalIfMinimized() { showNormalIfMinimized(false); }
+    void showNormalIfMinimized(bool fToggleHidden);
     /** Simply calls showNormalIfMinimized(true) for use in SLOT() macro */
     void toggleHidden();
 
diff --git a/src/qt/clientmodel.cpp b/src/qt/clientmodel.cpp
index 7154ac14be..b2cf4b6399 100644
--- a/src/qt/clientmodel.cpp
+++ b/src/qt/clientmodel.cpp
@@ -44,7 +44,7 @@ ClientModel::ClientModel(interfaces::Node& node, OptionsModel *_optionsModel, QO
     peerTableModel = new PeerTableModel(m_node, this);
     banTableModel = new BanTableModel(m_node, this);
     pollTimer = new QTimer(this);
-    connect(pollTimer, SIGNAL(timeout()), this, SLOT(updateTimer()));
+    connect(pollTimer, &QTimer::timeout, this, &ClientModel::updateTimer);
     pollTimer->start(MODEL_UPDATE_DELAY);
 
     subscribeToCoreSignals();
diff --git a/src/qt/coincontroldialog.cpp b/src/qt/coincontroldialog.cpp
index ca3598334d..68330c51fa 100644
--- a/src/qt/coincontroldialog.cpp
+++ b/src/qt/coincontroldialog.cpp
@@ -68,13 +68,13 @@ CoinControlDialog::CoinControlDialog(const PlatformStyle *_platformStyle, QWidge
     contextMenu->addAction(unlockAction);
 
     // context menu signals
-    connect(ui->treeWidget, SIGNAL(customContextMenuRequested(QPoint)), this, SLOT(showMenu(QPoint)));
-    connect(copyAddressAction, SIGNAL(triggered()), this, SLOT(copyAddress()));
-    connect(copyLabelAction, SIGNAL(triggered()), this, SLOT(copyLabel()));
-    connect(copyAmountAction, SIGNAL(triggered()), this, SLOT(copyAmount()));
-    connect(copyTransactionHashAction, SIGNAL(triggered()), this, SLOT(copyTransactionHash()));
-    connect(lockAction, SIGNAL(triggered()), this, SLOT(lockCoin()));
-    connect(unlockAction, SIGNAL(triggered()), this, SLOT(unlockCoin()));
+    connect(ui->treeWidget, &QWidget::customContextMenuRequested, this, &CoinControlDialog::showMenu);
+    connect(copyAddressAction, &QAction::triggered, this, &CoinControlDialog::copyAddress);
+    connect(copyLabelAction, &QAction::triggered, this, &CoinControlDialog::copyLabel);
+    connect(copyAmountAction, &QAction::triggered, this, &CoinControlDialog::copyAmount);
+    connect(copyTransactionHashAction, &QAction::triggered, this, &CoinControlDialog::copyTransactionHash);
+    connect(lockAction, &QAction::triggered, this, &CoinControlDialog::lockCoin);
+    connect(unlockAction, &QAction::triggered, this, &CoinControlDialog::unlockCoin);
 
     // clipboard actions
     QAction *clipboardQuantityAction = new QAction(tr("Copy quantity"), this);
@@ -85,13 +85,13 @@ CoinControlDialog::CoinControlDialog(const PlatformStyle *_platformStyle, QWidge
     QAction *clipboardLowOutputAction = new QAction(tr("Copy dust"), this);
     QAction *clipboardChangeAction = new QAction(tr("Copy change"), this);
 
-    connect(clipboardQuantityAction, SIGNAL(triggered()), this, SLOT(clipboardQuantity()));
-    connect(clipboardAmountAction, SIGNAL(triggered()), this, SLOT(clipboardAmount()));
-    connect(clipboardFeeAction, SIGNAL(triggered()), this, SLOT(clipboardFee()));
-    connect(clipboardAfterFeeAction, SIGNAL(triggered()), this, SLOT(clipboardAfterFee()));
-    connect(clipboardBytesAction, SIGNAL(triggered()), this, SLOT(clipboardBytes()));
-    connect(clipboardLowOutputAction, SIGNAL(triggered()), this, SLOT(clipboardLowOutput()));
-    connect(clipboardChangeAction, SIGNAL(triggered()), this, SLOT(clipboardChange()));
+    connect(clipboardQuantityAction, &QAction::triggered, this, &CoinControlDialog::clipboardQuantity);
+    connect(clipboardAmountAction, &QAction::triggered, this, &CoinControlDialog::clipboardAmount);
+    connect(clipboardFeeAction, &QAction::triggered, this, &CoinControlDialog::clipboardFee);
+    connect(clipboardAfterFeeAction, &QAction::triggered, this, &CoinControlDialog::clipboardAfterFee);
+    connect(clipboardBytesAction, &QAction::triggered, this, &CoinControlDialog::clipboardBytes);
+    connect(clipboardLowOutputAction, &QAction::triggered, this, &CoinControlDialog::clipboardLowOutput);
+    connect(clipboardChangeAction, &QAction::triggered, this, &CoinControlDialog::clipboardChange);
 
     ui->labelCoinControlQuantity->addAction(clipboardQuantityAction);
     ui->labelCoinControlAmount->addAction(clipboardAmountAction);
@@ -102,21 +102,21 @@ CoinControlDialog::CoinControlDialog(const PlatformStyle *_platformStyle, QWidge
     ui->labelCoinControlChange->addAction(clipboardChangeAction);
 
     // toggle tree/list mode
-    connect(ui->radioTreeMode, SIGNAL(toggled(bool)), this, SLOT(radioTreeMode(bool)));
-    connect(ui->radioListMode, SIGNAL(toggled(bool)), this, SLOT(radioListMode(bool)));
+    connect(ui->radioTreeMode, &QRadioButton::toggled, this, &CoinControlDialog::radioTreeMode);
+    connect(ui->radioListMode, &QRadioButton::toggled, this, &CoinControlDialog::radioListMode);
 
     // click on checkbox
-    connect(ui->treeWidget, SIGNAL(itemChanged(QTreeWidgetItem*, int)), this, SLOT(viewItemChanged(QTreeWidgetItem*, int)));
+    connect(ui->treeWidget, &QTreeWidget::itemChanged, this, &CoinControlDialog::viewItemChanged);
 
     // click on header
     ui->treeWidget->header()->setSectionsClickable(true);
-    connect(ui->treeWidget->header(), SIGNAL(sectionClicked(int)), this, SLOT(headerSectionClicked(int)));
+    connect(ui->treeWidget->header(), &QHeaderView::sectionClicked, this, &CoinControlDialog::headerSectionClicked);
 
     // ok button
-    connect(ui->buttonBox, SIGNAL(clicked( QAbstractButton*)), this, SLOT(buttonBoxClicked(QAbstractButton*)));
+    connect(ui->buttonBox, &QDialogButtonBox::clicked, this, &CoinControlDialog::buttonBoxClicked);
 
     // (un)select all
-    connect(ui->pushButtonSelectAll, SIGNAL(clicked()), this, SLOT(buttonSelectAllClicked()));
+    connect(ui->pushButtonSelectAll, &QPushButton::clicked, this, &CoinControlDialog::buttonSelectAllClicked);
 
     ui->treeWidget->setColumnWidth(COLUMN_CHECKBOX, 84);
     ui->treeWidget->setColumnWidth(COLUMN_AMOUNT, 110);
diff --git a/src/qt/guiutil.cpp b/src/qt/guiutil.cpp
index f8391b6303..bbf60d96fd 100644
--- a/src/qt/guiutil.cpp
+++ b/src/qt/guiutil.cpp
@@ -409,15 +409,15 @@ bool ToolTipToRichTextFilter::eventFilter(QObject *obj, QEvent *evt)
 
 void TableViewLastColumnResizingFixer::connectViewHeadersSignals()
 {
-    connect(tableView->horizontalHeader(), SIGNAL(sectionResized(int,int,int)), this, SLOT(on_sectionResized(int,int,int)));
-    connect(tableView->horizontalHeader(), SIGNAL(geometriesChanged()), this, SLOT(on_geometriesChanged()));
+    connect(tableView->horizontalHeader(), &QHeaderView::sectionResized, this, &TableViewLastColumnResizingFixer::on_sectionResized);
+    connect(tableView->horizontalHeader(), &QHeaderView::geometriesChanged, this, &TableViewLastColumnResizingFixer::on_geometriesChanged);
 }
 
 // We need to disconnect these while handling the resize events, otherwise we can enter infinite loops.
 void TableViewLastColumnResizingFixer::disconnectViewHeadersSignals()
 {
-    disconnect(tableView->horizontalHeader(), SIGNAL(sectionResized(int,int,int)), this, SLOT(on_sectionResized(int,int,int)));
-    disconnect(tableView->horizontalHeader(), SIGNAL(geometriesChanged()), this, SLOT(on_geometriesChanged()));
+    disconnect(tableView->horizontalHeader(), &QHeaderView::sectionResized, this, &TableViewLastColumnResizingFixer::on_sectionResized);
+    disconnect(tableView->horizontalHeader(), &QHeaderView::geometriesChanged, this, &TableViewLastColumnResizingFixer::on_geometriesChanged);
 }
 
 // Setup the resize mode, handles compatibility for Qt5 and below as the method signatures changed.
diff --git a/src/qt/intro.cpp b/src/qt/intro.cpp
index dbba3c1b3b..b19cc17a4d 100644
--- a/src/qt/intro.cpp
+++ b/src/qt/intro.cpp
@@ -303,11 +303,11 @@ void Intro::startThread()
     FreespaceChecker *executor = new FreespaceChecker(this);
     executor->moveToThread(thread);
 
-    connect(executor, SIGNAL(reply(int,QString,quint64)), this, SLOT(setStatus(int,QString,quint64)));
-    connect(this, SIGNAL(requestCheck()), executor, SLOT(check()));
+    connect(executor, &FreespaceChecker::reply, this, &Intro::setStatus);
+    connect(this, &Intro::requestCheck, executor, &FreespaceChecker::check);
     /*  make sure executor object is deleted in its own thread */
-    connect(this, SIGNAL(stopThread()), executor, SLOT(deleteLater()));
-    connect(this, SIGNAL(stopThread()), thread, SLOT(quit()));
+    connect(this, &Intro::stopThread, executor, &QObject::deleteLater);
+    connect(this, &Intro::stopThread, thread, &QThread::quit);
 
     thread->start();
 }
diff --git a/src/qt/modaloverlay.cpp b/src/qt/modaloverlay.cpp
index dec9d78326..c5bedf007a 100644
--- a/src/qt/modaloverlay.cpp
+++ b/src/qt/modaloverlay.cpp
@@ -21,7 +21,7 @@ layerIsVisible(false),
 userClosed(false)
 {
     ui->setupUi(this);
-    connect(ui->closeButton, SIGNAL(clicked()), this, SLOT(closeClicked()));
+    connect(ui->closeButton, &QPushButton::clicked, this, &ModalOverlay::closeClicked);
     if (parent) {
         parent->installEventFilter(this);
         raise();
diff --git a/src/qt/optionsdialog.cpp b/src/qt/optionsdialog.cpp
index d1477d362d..b51322394f 100644
--- a/src/qt/optionsdialog.cpp
+++ b/src/qt/optionsdialog.cpp
@@ -46,7 +46,7 @@ OptionsDialog::OptionsDialog(QWidget *parent, bool enableWallet) :
     ui->pruneWarning->setStyleSheet("QLabel { color: red; }");
 
     ui->pruneSize->setEnabled(false);
-    connect(ui->prune, SIGNAL(toggled(bool)), ui->pruneSize, SLOT(setEnabled(bool)));
+    connect(ui->prune, &QPushButton::toggled, ui->pruneSize, &QWidget::setEnabled);
 
     /* Network elements init */
 #ifndef USE_UPNP
@@ -61,13 +61,13 @@ OptionsDialog::OptionsDialog(QWidget *parent, bool enableWallet) :
     ui->proxyPortTor->setEnabled(false);
     ui->proxyPortTor->setValidator(new QIntValidator(1, 65535, this));
 
-    connect(ui->connectSocks, SIGNAL(toggled(bool)), ui->proxyIp, SLOT(setEnabled(bool)));
-    connect(ui->connectSocks, SIGNAL(toggled(bool)), ui->proxyPort, SLOT(setEnabled(bool)));
-    connect(ui->connectSocks, SIGNAL(toggled(bool)), this, SLOT(updateProxyValidationState()));
+    connect(ui->connectSocks, &QPushButton::toggled, ui->proxyIp, &QWidget::setEnabled);
+    connect(ui->connectSocks, &QPushButton::toggled, ui->proxyPort, &QWidget::setEnabled);
+    connect(ui->connectSocks, &QPushButton::toggled, this, &OptionsDialog::updateProxyValidationState);
 
-    connect(ui->connectSocksTor, SIGNAL(toggled(bool)), ui->proxyIpTor, SLOT(setEnabled(bool)));
-    connect(ui->connectSocksTor, SIGNAL(toggled(bool)), ui->proxyPortTor, SLOT(setEnabled(bool)));
-    connect(ui->connectSocksTor, SIGNAL(toggled(bool)), this, SLOT(updateProxyValidationState()));
+    connect(ui->connectSocksTor, &QPushButton::toggled, ui->proxyIpTor, &QWidget::setEnabled);
+    connect(ui->connectSocksTor, &QPushButton::toggled, ui->proxyPortTor, &QWidget::setEnabled);
+    connect(ui->connectSocksTor, &QPushButton::toggled, this, &OptionsDialog::updateProxyValidationState);
 
     /* Window elements init */
 #ifdef Q_OS_MAC
@@ -122,10 +122,10 @@ OptionsDialog::OptionsDialog(QWidget *parent, bool enableWallet) :
     /* setup/change UI elements when proxy IPs are invalid/valid */
     ui->proxyIp->setCheckValidator(new ProxyAddressValidator(parent));
     ui->proxyIpTor->setCheckValidator(new ProxyAddressValidator(parent));
-    connect(ui->proxyIp, SIGNAL(validationDidChange(QValidatedLineEdit *)), this, SLOT(updateProxyValidationState()));
-    connect(ui->proxyIpTor, SIGNAL(validationDidChange(QValidatedLineEdit *)), this, SLOT(updateProxyValidationState()));
-    connect(ui->proxyPort, SIGNAL(textChanged(const QString&)), this, SLOT(updateProxyValidationState()));
-    connect(ui->proxyPortTor, SIGNAL(textChanged(const QString&)), this, SLOT(updateProxyValidationState()));
+    connect(ui->proxyIp, &QValidatedLineEdit::validationDidChange, this, &OptionsDialog::updateProxyValidationState);
+    connect(ui->proxyIpTor, &QValidatedLineEdit::validationDidChange, this, &OptionsDialog::updateProxyValidationState);
+    connect(ui->proxyPort, &QLineEdit::textChanged, this, &OptionsDialog::updateProxyValidationState);
+    connect(ui->proxyPortTor, &QLineEdit::textChanged, this, &OptionsDialog::updateProxyValidationState);
 }
 
 OptionsDialog::~OptionsDialog()
@@ -158,20 +158,20 @@ void OptionsDialog::setModel(OptionsModel *_model)
     /* warn when one of the following settings changes by user action (placed here so init via mapper doesn't trigger them) */
 
     /* Main */
-    connect(ui->prune, SIGNAL(clicked(bool)), this, SLOT(showRestartWarning()));
-    connect(ui->prune, SIGNAL(clicked(bool)), this, SLOT(togglePruneWarning(bool)));
-    connect(ui->pruneSize, SIGNAL(valueChanged(int)), this, SLOT(showRestartWarning()));
-    connect(ui->databaseCache, SIGNAL(valueChanged(int)), this, SLOT(showRestartWarning()));
-    connect(ui->threadsScriptVerif, SIGNAL(valueChanged(int)), this, SLOT(showRestartWarning()));
+    connect(ui->prune, &QCheckBox::clicked, this, &OptionsDialog::showRestartWarning);
+    connect(ui->prune, &QCheckBox::clicked, this, &OptionsDialog::togglePruneWarning);
+    connect(ui->pruneSize, static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged), this, &OptionsDialog::showRestartWarning);
+    connect(ui->databaseCache, static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged), this, &OptionsDialog::showRestartWarning);
+    connect(ui->threadsScriptVerif, static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged), this, &OptionsDialog::showRestartWarning);
     /* Wallet */
-    connect(ui->spendZeroConfChange, SIGNAL(clicked(bool)), this, SLOT(showRestartWarning()));
+    connect(ui->spendZeroConfChange, &QCheckBox::clicked, this, &OptionsDialog::showRestartWarning);
     /* Network */
-    connect(ui->allowIncoming, SIGNAL(clicked(bool)), this, SLOT(showRestartWarning()));
-    connect(ui->connectSocks, SIGNAL(clicked(bool)), this, SLOT(showRestartWarning()));
-    connect(ui->connectSocksTor, SIGNAL(clicked(bool)), this, SLOT(showRestartWarning()));
+    connect(ui->allowIncoming, &QCheckBox::clicked, this, &OptionsDialog::showRestartWarning);
+    connect(ui->connectSocks, &QCheckBox::clicked, this, &OptionsDialog::showRestartWarning);
+    connect(ui->connectSocksTor, &QCheckBox::clicked, this, &OptionsDialog::showRestartWarning);
     /* Display */
-    connect(ui->lang, SIGNAL(valueChanged()), this, SLOT(showRestartWarning()));
-    connect(ui->thirdPartyTxUrls, SIGNAL(textChanged(const QString &)), this, SLOT(showRestartWarning()));
+    connect(ui->lang, static_cast<void (QValueComboBox::*)()>(&QValueComboBox::valueChanged), [this]{ showRestartWarning(); });
+    connect(ui->thirdPartyTxUrls, &QLineEdit::textChanged, [this]{ showRestartWarning(); });
 }
 
 void OptionsDialog::setCurrentTab(OptionsDialog::Tab tab)
@@ -300,7 +300,7 @@ void OptionsDialog::showRestartWarning(bool fPersistent)
         ui->statusLabel->setText(tr("This change would require a client restart."));
         // clear non-persistent status label after 10 seconds
         // Todo: should perhaps be a class attribute, if we extend the use of statusLabel
-        QTimer::singleShot(10000, this, SLOT(clearStatusLabel()));
+        QTimer::singleShot(10000, this, &OptionsDialog::clearStatusLabel);
     }
 }
 
diff --git a/src/qt/overviewpage.cpp b/src/qt/overviewpage.cpp
index ba47935196..1db9609979 100644
--- a/src/qt/overviewpage.cpp
+++ b/src/qt/overviewpage.cpp
@@ -133,12 +133,12 @@ OverviewPage::OverviewPage(const PlatformStyle *platformStyle, QWidget *parent)
     ui->listTransactions->setMinimumHeight(NUM_ITEMS * (DECORATION_SIZE + 2));
     ui->listTransactions->setAttribute(Qt::WA_MacShowFocusRect, false);
 
-    connect(ui->listTransactions, SIGNAL(clicked(QModelIndex)), this, SLOT(handleTransactionClicked(QModelIndex)));
+    connect(ui->listTransactions, &QListView::clicked, this, &OverviewPage::handleTransactionClicked);
 
     // start with displaying the "out of sync" warnings
     showOutOfSyncWarning(true);
-    connect(ui->labelWalletStatus, SIGNAL(clicked()), this, SLOT(handleOutOfSyncWarningClicks()));
-    connect(ui->labelTransactionsStatus, SIGNAL(clicked()), this, SLOT(handleOutOfSyncWarningClicks()));
+    connect(ui->labelWalletStatus, &QPushButton::clicked, this, &OverviewPage::handleOutOfSyncWarningClicks);
+    connect(ui->labelTransactionsStatus, &QPushButton::clicked, this, &OverviewPage::handleOutOfSyncWarningClicks);
 }
 
 void OverviewPage::handleTransactionClicked(const QModelIndex &index)
@@ -201,7 +201,7 @@ void OverviewPage::setClientModel(ClientModel *model)
     if(model)
     {
         // Show warning if this is a prerelease version
-        connect(model, SIGNAL(alertsChanged(QString)), this, SLOT(updateAlerts(QString)));
+        connect(model, &ClientModel::alertsChanged, this, &OverviewPage::updateAlerts);
         updateAlerts(model->getStatusBarWarnings());
     }
 }
@@ -227,12 +227,12 @@ void OverviewPage::setWalletModel(WalletModel *model)
         interfaces::Wallet& wallet = model->wallet();
         interfaces::WalletBalances balances = wallet.getBalances();
         setBalance(balances);
-        connect(model, SIGNAL(balanceChanged(interfaces::WalletBalances)), this, SLOT(setBalance(interfaces::WalletBalances)));
+        connect(model, &WalletModel::balanceChanged, this, &OverviewPage::setBalance);
 
-        connect(model->getOptionsModel(), SIGNAL(displayUnitChanged(int)), this, SLOT(updateDisplayUnit()));
+        connect(model->getOptionsModel(), &OptionsModel::displayUnitChanged, this, &OverviewPage::updateDisplayUnit);
 
         updateWatchOnlyLabels(wallet.haveWatchOnly());
-        connect(model, SIGNAL(notifyWatchonlyChanged(bool)), this, SLOT(updateWatchOnlyLabels(bool)));
+        connect(model, &WalletModel::notifyWatchonlyChanged, this, &OverviewPage::updateWatchOnlyLabels);
     }
 
     // update the display unit, to not use the default ("BTC")
diff --git a/src/qt/paymentserver.cpp b/src/qt/paymentserver.cpp
index 5bf2bb8a0e..bcafc8f859 100644
--- a/src/qt/paymentserver.cpp
+++ b/src/qt/paymentserver.cpp
@@ -318,8 +318,8 @@ PaymentServer::PaymentServer(QObject* parent, bool startLocalServer) :
                 tr("Cannot start bitcoin: click-to-pay handler"));
         }
         else {
-            connect(uriServer, SIGNAL(newConnection()), this, SLOT(handleURIConnection()));
-            connect(this, SIGNAL(receivedPaymentACK(QString)), this, SLOT(handlePaymentACK(QString)));
+            connect(uriServer, &QLocalServer::newConnection, this, &PaymentServer::handleURIConnection);
+            connect(this, &PaymentServer::receivedPaymentACK, this, &PaymentServer::handlePaymentACK);
         }
     }
 }
@@ -369,10 +369,8 @@ void PaymentServer::initNetManager()
     else
         qDebug() << "PaymentServer::initNetManager: No active proxy server found.";
 
-    connect(netManager, SIGNAL(finished(QNetworkReply*)),
-            this, SLOT(netRequestFinished(QNetworkReply*)));
-    connect(netManager, SIGNAL(sslErrors(QNetworkReply*, const QList<QSslError> &)),
-            this, SLOT(reportSslErrors(QNetworkReply*, const QList<QSslError> &)));
+    connect(netManager, &QNetworkAccessManager::finished, this, &PaymentServer::netRequestFinished);
+    connect(netManager, &QNetworkAccessManager::sslErrors, this, &PaymentServer::reportSslErrors);
 }
 
 void PaymentServer::uiReady()
@@ -470,8 +468,7 @@ void PaymentServer::handleURIConnection()
     while (clientConnection->bytesAvailable() < (int)sizeof(quint32))
         clientConnection->waitForReadyRead();
 
-    connect(clientConnection, SIGNAL(disconnected()),
-            clientConnection, SLOT(deleteLater()));
+    connect(clientConnection, &QLocalSocket::disconnected, clientConnection, &QLocalSocket::deleteLater);
 
     QDataStream in(clientConnection);
     in.setVersion(QDataStream::Qt_4_0);
diff --git a/src/qt/peertablemodel.cpp b/src/qt/peertablemodel.cpp
index 715fc8b5e0..59a751fb12 100644
--- a/src/qt/peertablemodel.cpp
+++ b/src/qt/peertablemodel.cpp
@@ -113,7 +113,7 @@ PeerTableModel::PeerTableModel(interfaces::Node& node, ClientModel *parent) :
 
     // set up timer for auto refresh
     timer = new QTimer(this);
-    connect(timer, SIGNAL(timeout()), SLOT(refresh()));
+    connect(timer, &QTimer::timeout, this, &PeerTableModel::refresh);
     timer->setInterval(MODEL_UPDATE_DELAY);
 
     // load initial data
diff --git a/src/qt/qvalidatedlineedit.cpp b/src/qt/qvalidatedlineedit.cpp
index de42490361..85c5a58a84 100644
--- a/src/qt/qvalidatedlineedit.cpp
+++ b/src/qt/qvalidatedlineedit.cpp
@@ -12,7 +12,7 @@ QValidatedLineEdit::QValidatedLineEdit(QWidget *parent) :
     valid(true),
     checkValidator(0)
 {
-    connect(this, SIGNAL(textChanged(QString)), this, SLOT(markValid()));
+    connect(this, &QValidatedLineEdit::textChanged, this, &QValidatedLineEdit::markValid);
 }
 
 void QValidatedLineEdit::setValid(bool _valid)
diff --git a/src/qt/qvaluecombobox.cpp b/src/qt/qvaluecombobox.cpp
index c2c0e84d65..76f94ecf85 100644
--- a/src/qt/qvaluecombobox.cpp
+++ b/src/qt/qvaluecombobox.cpp
@@ -7,7 +7,7 @@
 QValueComboBox::QValueComboBox(QWidget *parent) :
         QComboBox(parent), role(Qt::UserRole)
 {
-    connect(this, SIGNAL(currentIndexChanged(int)), this, SLOT(handleSelectionChanged(int)));
+    connect(this, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), this, &QValueComboBox::handleSelectionChanged);
 }
 
 QVariant QValueComboBox::value() const
diff --git a/src/qt/receivecoinsdialog.cpp b/src/qt/receivecoinsdialog.cpp
index 12de189229..a7cc5da19e 100644
--- a/src/qt/receivecoinsdialog.cpp
+++ b/src/qt/receivecoinsdialog.cpp
@@ -57,13 +57,13 @@ ReceiveCoinsDialog::ReceiveCoinsDialog(const PlatformStyle *_platformStyle, QWid
     contextMenu->addAction(copyAmountAction);
 
     // context menu signals
-    connect(ui->recentRequestsView, SIGNAL(customContextMenuRequested(QPoint)), this, SLOT(showMenu(QPoint)));
-    connect(copyURIAction, SIGNAL(triggered()), this, SLOT(copyURI()));
-    connect(copyLabelAction, SIGNAL(triggered()), this, SLOT(copyLabel()));
-    connect(copyMessageAction, SIGNAL(triggered()), this, SLOT(copyMessage()));
-    connect(copyAmountAction, SIGNAL(triggered()), this, SLOT(copyAmount()));
+    connect(ui->recentRequestsView, &QWidget::customContextMenuRequested, this, &ReceiveCoinsDialog::showMenu);
+    connect(copyURIAction, &QAction::triggered, this, &ReceiveCoinsDialog::copyURI);
+    connect(copyLabelAction, &QAction::triggered, this, &ReceiveCoinsDialog::copyLabel);
+    connect(copyMessageAction, &QAction::triggered, this, &ReceiveCoinsDialog::copyMessage);
+    connect(copyAmountAction, &QAction::triggered, this, &ReceiveCoinsDialog::copyAmount);
 
-    connect(ui->clearButton, SIGNAL(clicked()), this, SLOT(clear()));
+    connect(ui->clearButton, &QPushButton::clicked, this, &ReceiveCoinsDialog::clear);
 }
 
 void ReceiveCoinsDialog::setModel(WalletModel *_model)
@@ -73,7 +73,7 @@ void ReceiveCoinsDialog::setModel(WalletModel *_model)
     if(_model && _model->getOptionsModel())
     {
         _model->getRecentRequestsTableModel()->sort(RecentRequestsTableModel::Date, Qt::DescendingOrder);
-        connect(_model->getOptionsModel(), SIGNAL(displayUnitChanged(int)), this, SLOT(updateDisplayUnit()));
+        connect(_model->getOptionsModel(), &OptionsModel::displayUnitChanged, this, &ReceiveCoinsDialog::updateDisplayUnit);
         updateDisplayUnit();
 
         QTableView* tableView = ui->recentRequestsView;
@@ -89,8 +89,8 @@ void ReceiveCoinsDialog::setModel(WalletModel *_model)
         tableView->setColumnWidth(RecentRequestsTableModel::Amount, AMOUNT_MINIMUM_COLUMN_WIDTH);
 
         connect(tableView->selectionModel(),
-            SIGNAL(selectionChanged(QItemSelection, QItemSelection)), this,
-            SLOT(recentRequestsView_selectionChanged(QItemSelection, QItemSelection)));
+            &QItemSelectionModel::selectionChanged, this,
+            &ReceiveCoinsDialog::recentRequestsView_selectionChanged);
         // Last 2 columns are set by the columnResizingFixer, when the table geometry is ready.
         columnResizingFixer = new GUIUtil::TableViewLastColumnResizingFixer(tableView, AMOUNT_MINIMUM_COLUMN_WIDTH, DATE_COLUMN_WIDTH, this);
 
diff --git a/src/qt/receiverequestdialog.cpp b/src/qt/receiverequestdialog.cpp
index 5bc5568e9a..c561d948be 100644
--- a/src/qt/receiverequestdialog.cpp
+++ b/src/qt/receiverequestdialog.cpp
@@ -30,10 +30,10 @@ QRImageWidget::QRImageWidget(QWidget *parent):
 {
     contextMenu = new QMenu(this);
     QAction *saveImageAction = new QAction(tr("&Save Image..."), this);
-    connect(saveImageAction, SIGNAL(triggered()), this, SLOT(saveImage()));
+    connect(saveImageAction, &QAction::triggered, this, &QRImageWidget::saveImage);
     contextMenu->addAction(saveImageAction);
     QAction *copyImageAction = new QAction(tr("&Copy Image"), this);
-    connect(copyImageAction, SIGNAL(triggered()), this, SLOT(copyImage()));
+    connect(copyImageAction, &QAction::triggered, this, &QRImageWidget::copyImage);
     contextMenu->addAction(copyImageAction);
 }
 
@@ -97,7 +97,7 @@ ReceiveRequestDialog::ReceiveRequestDialog(QWidget *parent) :
     ui->lblQRCode->setVisible(false);
 #endif
 
-    connect(ui->btnSaveAs, SIGNAL(clicked()), ui->lblQRCode, SLOT(saveImage()));
+    connect(ui->btnSaveAs, &QPushButton::clicked, ui->lblQRCode, &QRImageWidget::saveImage);
 }
 
 ReceiveRequestDialog::~ReceiveRequestDialog()
@@ -110,7 +110,7 @@ void ReceiveRequestDialog::setModel(WalletModel *_model)
     this->model = _model;
 
     if (_model)
-        connect(_model->getOptionsModel(), SIGNAL(displayUnitChanged(int)), this, SLOT(update()));
+        connect(_model->getOptionsModel(), &OptionsModel::displayUnitChanged, this, &ReceiveRequestDialog::update);
 
     // update the display unit if necessary
     update();
diff --git a/src/qt/recentrequeststablemodel.cpp b/src/qt/recentrequeststablemodel.cpp
index f0d2aba370..82ab48ac20 100644
--- a/src/qt/recentrequeststablemodel.cpp
+++ b/src/qt/recentrequeststablemodel.cpp
@@ -26,7 +26,7 @@ RecentRequestsTableModel::RecentRequestsTableModel(WalletModel *parent) :
     /* These columns must match the indices in the ColumnIndex enumeration */
     columns << tr("Date") << tr("Label") << tr("Message") << getAmountTitle();
 
-    connect(walletModel->getOptionsModel(), SIGNAL(displayUnitChanged(int)), this, SLOT(updateDisplayUnit()));
+    connect(walletModel->getOptionsModel(), &OptionsModel::displayUnitChanged, this, &RecentRequestsTableModel::updateDisplayUnit);
 }
 
 RecentRequestsTableModel::~RecentRequestsTableModel()
diff --git a/src/qt/rpcconsole.cpp b/src/qt/rpcconsole.cpp
index 2b0307d286..66e36f0b67 100644
--- a/src/qt/rpcconsole.cpp
+++ b/src/qt/rpcconsole.cpp
@@ -105,12 +105,10 @@ public:
         func(_func)
     {
         timer.setSingleShot(true);
-        connect(&timer, SIGNAL(timeout()), this, SLOT(timeout()));
+        connect(&timer, &QTimer::timeout, [this]{ func(); });
         timer.start(millis);
     }
     ~QtRPCTimerBase() {}
-private Q_SLOTS:
-    void timeout() { func(); }
 private:
     QTimer timer;
     std::function<void(void)> func;
@@ -474,10 +472,10 @@ RPCConsole::RPCConsole(interfaces::Node& node, const PlatformStyle *_platformSty
     ui->lineEdit->installEventFilter(this);
     ui->messagesWidget->installEventFilter(this);
 
-    connect(ui->clearButton, SIGNAL(clicked()), this, SLOT(clear()));
-    connect(ui->fontBiggerButton, SIGNAL(clicked()), this, SLOT(fontBigger()));
-    connect(ui->fontSmallerButton, SIGNAL(clicked()), this, SLOT(fontSmaller()));
-    connect(ui->btnClearTrafficGraph, SIGNAL(clicked()), ui->trafficGraph, SLOT(clear()));
+    connect(ui->clearButton, &QPushButton::clicked, this, &RPCConsole::clear);
+    connect(ui->fontBiggerButton, &QPushButton::clicked, this, &RPCConsole::fontBigger);
+    connect(ui->fontSmallerButton, &QPushButton::clicked, this, &RPCConsole::fontSmaller);
+    connect(ui->btnClearTrafficGraph, &QPushButton::clicked, ui->trafficGraph, &TrafficGraphWidget::clear);
 
     // disable the wallet selector by default
     ui->WalletSelector->setVisible(false);
@@ -565,19 +563,19 @@ void RPCConsole::setClientModel(ClientModel *model)
     if (model && clientModel->getPeerTableModel() && clientModel->getBanTableModel()) {
         // Keep up to date with client
         setNumConnections(model->getNumConnections());
-        connect(model, SIGNAL(numConnectionsChanged(int)), this, SLOT(setNumConnections(int)));
+        connect(model, &ClientModel::numConnectionsChanged, this, &RPCConsole::setNumConnections);
 
         interfaces::Node& node = clientModel->node();
         setNumBlocks(node.getNumBlocks(), QDateTime::fromTime_t(node.getLastBlockTime()), node.getVerificationProgress(), false);
-        connect(model, SIGNAL(numBlocksChanged(int,QDateTime,double,bool)), this, SLOT(setNumBlocks(int,QDateTime,double,bool)));
+        connect(model, &ClientModel::numBlocksChanged, this, &RPCConsole::setNumBlocks);
 
         updateNetworkState();
-        connect(model, SIGNAL(networkActiveChanged(bool)), this, SLOT(setNetworkActive(bool)));
+        connect(model, &ClientModel::networkActiveChanged, this, &RPCConsole::setNetworkActive);
 
         updateTrafficStats(node.getTotalBytesRecv(), node.getTotalBytesSent());
-        connect(model, SIGNAL(bytesChanged(quint64,quint64)), this, SLOT(updateTrafficStats(quint64, quint64)));
+        connect(model, &ClientModel::bytesChanged, this, &RPCConsole::updateTrafficStats);
 
-        connect(model, SIGNAL(mempoolSizeChanged(long,size_t)), this, SLOT(setMempoolSize(long,size_t)));
+        connect(model, &ClientModel::mempoolSizeChanged, this, &RPCConsole::setMempoolSize);
 
         // set up peer table
         ui->peerWidget->setModel(model->getPeerTableModel());
@@ -614,23 +612,22 @@ void RPCConsole::setClientModel(ClientModel *model)
         signalMapper->setMapping(banAction24h, 60*60*24);
         signalMapper->setMapping(banAction7d, 60*60*24*7);
         signalMapper->setMapping(banAction365d, 60*60*24*365);
-        connect(banAction1h, SIGNAL(triggered()), signalMapper, SLOT(map()));
-        connect(banAction24h, SIGNAL(triggered()), signalMapper, SLOT(map()));
-        connect(banAction7d, SIGNAL(triggered()), signalMapper, SLOT(map()));
-        connect(banAction365d, SIGNAL(triggered()), signalMapper, SLOT(map()));
-        connect(signalMapper, SIGNAL(mapped(int)), this, SLOT(banSelectedNode(int)));
+        connect(banAction1h, &QAction::triggered, signalMapper, static_cast<void (QSignalMapper::*)()>(&QSignalMapper::map));
+        connect(banAction24h, &QAction::triggered, signalMapper, static_cast<void (QSignalMapper::*)()>(&QSignalMapper::map));
+        connect(banAction7d, &QAction::triggered, signalMapper, static_cast<void (QSignalMapper::*)()>(&QSignalMapper::map));
+        connect(banAction365d, &QAction::triggered, signalMapper, static_cast<void (QSignalMapper::*)()>(&QSignalMapper::map));
+        connect(signalMapper, static_cast<void (QSignalMapper::*)(int)>(&QSignalMapper::mapped), this, &RPCConsole::banSelectedNode);
 
         // peer table context menu signals
-        connect(ui->peerWidget, SIGNAL(customContextMenuRequested(const QPoint&)), this, SLOT(showPeersTableContextMenu(const QPoint&)));
-        connect(disconnectAction, SIGNAL(triggered()), this, SLOT(disconnectSelectedNode()));
+        connect(ui->peerWidget, &QTableView::customContextMenuRequested, this, &RPCConsole::showPeersTableContextMenu);
+        connect(disconnectAction, &QAction::triggered, this, &RPCConsole::disconnectSelectedNode);
 
         // peer table signal handling - update peer details when selecting new node
-        connect(ui->peerWidget->selectionModel(), SIGNAL(selectionChanged(const QItemSelection &, const QItemSelection &)),
-            this, SLOT(peerSelected(const QItemSelection &, const QItemSelection &)));
+        connect(ui->peerWidget->selectionModel(), &QItemSelectionModel::selectionChanged, this, &RPCConsole::peerSelected);
         // peer table signal handling - update peer details when new nodes are added to the model
-        connect(model->getPeerTableModel(), SIGNAL(layoutChanged()), this, SLOT(peerLayoutChanged()));
+        connect(model->getPeerTableModel(), &PeerTableModel::layoutChanged, this, &RPCConsole::peerLayoutChanged);
         // peer table signal handling - cache selected node ids
-        connect(model->getPeerTableModel(), SIGNAL(layoutAboutToBeChanged()), this, SLOT(peerLayoutAboutToChange()));
+        connect(model->getPeerTableModel(), &PeerTableModel::layoutAboutToBeChanged, this, &RPCConsole::peerLayoutAboutToChange);
 
         // set up ban table
         ui->banlistWidget->setModel(model->getBanTableModel());
@@ -651,13 +648,13 @@ void RPCConsole::setClientModel(ClientModel *model)
         banTableContextMenu->addAction(unbanAction);
 
         // ban table context menu signals
-        connect(ui->banlistWidget, SIGNAL(customContextMenuRequested(const QPoint&)), this, SLOT(showBanTableContextMenu(const QPoint&)));
-        connect(unbanAction, SIGNAL(triggered()), this, SLOT(unbanSelectedNode()));
+        connect(ui->banlistWidget, &QTableView::customContextMenuRequested, this, &RPCConsole::showBanTableContextMenu);
+        connect(unbanAction, &QAction::triggered, this, &RPCConsole::unbanSelectedNode);
 
         // ban table signal handling - clear peer details when clicking a peer in the ban table
-        connect(ui->banlistWidget, SIGNAL(clicked(const QModelIndex&)), this, SLOT(clearSelectedNode()));
+        connect(ui->banlistWidget, &QTableView::clicked, this, &RPCConsole::clearSelectedNode);
         // ban table signal handling - ensure ban table is shown or hidden (if empty)
-        connect(model->getBanTableModel(), SIGNAL(layoutChanged()), this, SLOT(showOrHideBanTableIfRequired()));
+        connect(model->getBanTableModel(), &BanTableModel::layoutChanged, this, &RPCConsole::showOrHideBanTableIfRequired);
         showOrHideBanTableIfRequired();
 
         // Provide initial values
@@ -972,15 +969,16 @@ void RPCConsole::startExecutor()
     executor->moveToThread(&thread);
 
     // Replies from executor object must go to this object
-    connect(executor, SIGNAL(reply(int,QString)), this, SLOT(message(int,QString)));
+    connect(executor, &RPCExecutor::reply, this, static_cast<void (RPCConsole::*)(int, const QString&)>(&RPCConsole::message));
+
     // Requests from this object must go to executor
-    connect(this, SIGNAL(cmdRequest(QString, QString)), executor, SLOT(request(QString, QString)));
+    connect(this, &RPCConsole::cmdRequest, executor, &RPCExecutor::request);
 
     // On stopExecutor signal
     // - quit the Qt event loop in the execution thread
-    connect(this, SIGNAL(stopExecutor()), &thread, SLOT(quit()));
+    connect(this, &RPCConsole::stopExecutor, &thread, &QThread::quit);
     // - queue executor for deletion (in execution thread)
-    connect(&thread, SIGNAL(finished()), executor, SLOT(deleteLater()), Qt::DirectConnection);
+    connect(&thread, &QThread::finished, executor, &RPCExecutor::deleteLater, Qt::DirectConnection);
 
     // Default implementation of QThread::run() simply spins up an event loop in the thread,
     // which is what we want.
diff --git a/src/qt/rpcconsole.h b/src/qt/rpcconsole.h
index 0671b47782..db77043951 100644
--- a/src/qt/rpcconsole.h
+++ b/src/qt/rpcconsole.h
@@ -96,7 +96,8 @@ public Q_SLOTS:
     void fontSmaller();
     void setFontSize(int newSize);
     /** Append the message to the message widget */
-    void message(int category, const QString &message, bool html = false);
+    void message(int category, const QString &msg) { message(category, msg, false); }
+    void message(int category, const QString &message, bool html);
     /** Set number of connections shown in the UI */
     void setNumConnections(int count);
     /** Set network state shown in the UI */
diff --git a/src/qt/sendcoinsdialog.cpp b/src/qt/sendcoinsdialog.cpp
index da155f872c..eed71397ab 100644
--- a/src/qt/sendcoinsdialog.cpp
+++ b/src/qt/sendcoinsdialog.cpp
@@ -72,13 +72,13 @@ SendCoinsDialog::SendCoinsDialog(const PlatformStyle *_platformStyle, QWidget *p
 
     addEntry();
 
-    connect(ui->addButton, SIGNAL(clicked()), this, SLOT(addEntry()));
-    connect(ui->clearButton, SIGNAL(clicked()), this, SLOT(clear()));
+    connect(ui->addButton, &QPushButton::clicked, this, &SendCoinsDialog::addEntry);
+    connect(ui->clearButton, &QPushButton::clicked, this, &SendCoinsDialog::clear);
 
     // Coin Control
-    connect(ui->pushButtonCoinControl, SIGNAL(clicked()), this, SLOT(coinControlButtonClicked()));
-    connect(ui->checkBoxCoinControlChange, SIGNAL(stateChanged(int)), this, SLOT(coinControlChangeChecked(int)));
-    connect(ui->lineEditCoinControlChange, SIGNAL(textEdited(const QString &)), this, SLOT(coinControlChangeEdited(const QString &)));
+    connect(ui->pushButtonCoinControl, &QPushButton::clicked, this, &SendCoinsDialog::coinControlButtonClicked);
+    connect(ui->checkBoxCoinControlChange, &QCheckBox::stateChanged, this, &SendCoinsDialog::coinControlChangeChecked);
+    connect(ui->lineEditCoinControlChange, &QValidatedLineEdit::textEdited, this, &SendCoinsDialog::coinControlChangeEdited);
 
     // Coin Control: clipboard actions
     QAction *clipboardQuantityAction = new QAction(tr("Copy quantity"), this);
@@ -88,13 +88,13 @@ SendCoinsDialog::SendCoinsDialog(const PlatformStyle *_platformStyle, QWidget *p
     QAction *clipboardBytesAction = new QAction(tr("Copy bytes"), this);
     QAction *clipboardLowOutputAction = new QAction(tr("Copy dust"), this);
     QAction *clipboardChangeAction = new QAction(tr("Copy change"), this);
-    connect(clipboardQuantityAction, SIGNAL(triggered()), this, SLOT(coinControlClipboardQuantity()));
-    connect(clipboardAmountAction, SIGNAL(triggered()), this, SLOT(coinControlClipboardAmount()));
-    connect(clipboardFeeAction, SIGNAL(triggered()), this, SLOT(coinControlClipboardFee()));
-    connect(clipboardAfterFeeAction, SIGNAL(triggered()), this, SLOT(coinControlClipboardAfterFee()));
-    connect(clipboardBytesAction, SIGNAL(triggered()), this, SLOT(coinControlClipboardBytes()));
-    connect(clipboardLowOutputAction, SIGNAL(triggered()), this, SLOT(coinControlClipboardLowOutput()));
-    connect(clipboardChangeAction, SIGNAL(triggered()), this, SLOT(coinControlClipboardChange()));
+    connect(clipboardQuantityAction, &QAction::triggered, this, &SendCoinsDialog::coinControlClipboardQuantity);
+    connect(clipboardAmountAction, &QAction::triggered, this, &SendCoinsDialog::coinControlClipboardAmount);
+    connect(clipboardFeeAction, &QAction::triggered, this, &SendCoinsDialog::coinControlClipboardFee);
+    connect(clipboardAfterFeeAction, &QAction::triggered, this, &SendCoinsDialog::coinControlClipboardAfterFee);
+    connect(clipboardBytesAction, &QAction::triggered, this, &SendCoinsDialog::coinControlClipboardBytes);
+    connect(clipboardLowOutputAction, &QAction::triggered, this, &SendCoinsDialog::coinControlClipboardLowOutput);
+    connect(clipboardChangeAction, &QAction::triggered, this, &SendCoinsDialog::coinControlClipboardChange);
     ui->labelCoinControlQuantity->addAction(clipboardQuantityAction);
     ui->labelCoinControlAmount->addAction(clipboardAmountAction);
     ui->labelCoinControlFee->addAction(clipboardFeeAction);
@@ -130,7 +130,7 @@ void SendCoinsDialog::setClientModel(ClientModel *_clientModel)
     this->clientModel = _clientModel;
 
     if (_clientModel) {
-        connect(_clientModel, SIGNAL(numBlocksChanged(int,QDateTime,double,bool)), this, SLOT(updateSmartFeeLabel()));
+        connect(_clientModel, &ClientModel::numBlocksChanged, this, &SendCoinsDialog::updateSmartFeeLabel);
     }
 }
 
@@ -151,13 +151,13 @@ void SendCoinsDialog::setModel(WalletModel *_model)
 
         interfaces::WalletBalances balances = _model->wallet().getBalances();
         setBalance(balances);
-        connect(_model, SIGNAL(balanceChanged(interfaces::WalletBalances)), this, SLOT(setBalance(interfaces::WalletBalances)));
-        connect(_model->getOptionsModel(), SIGNAL(displayUnitChanged(int)), this, SLOT(updateDisplayUnit()));
+        connect(_model, &WalletModel::balanceChanged, this, &SendCoinsDialog::setBalance);
+        connect(_model->getOptionsModel(), &OptionsModel::displayUnitChanged, this, &SendCoinsDialog::updateDisplayUnit);
         updateDisplayUnit();
 
         // Coin Control
-        connect(_model->getOptionsModel(), SIGNAL(displayUnitChanged(int)), this, SLOT(coinControlUpdateLabels()));
-        connect(_model->getOptionsModel(), SIGNAL(coinControlFeaturesChanged(bool)), this, SLOT(coinControlFeatureChanged(bool)));
+        connect(_model->getOptionsModel(), &OptionsModel::displayUnitChanged, this, &SendCoinsDialog::coinControlUpdateLabels);
+        connect(_model->getOptionsModel(), &OptionsModel::coinControlFeaturesChanged, this, &SendCoinsDialog::coinControlFeatureChanged);
         ui->frameCoinControl->setVisible(_model->getOptionsModel()->getCoinControlFeatures());
         coinControlUpdateLabels();
 
@@ -165,16 +165,16 @@ void SendCoinsDialog::setModel(WalletModel *_model)
         for (const int n : confTargets) {
             ui->confTargetSelector->addItem(tr("%1 (%2 blocks)").arg(GUIUtil::formatNiceTimeOffset(n*Params().GetConsensus().nPowTargetSpacing)).arg(n));
         }
-        connect(ui->confTargetSelector, SIGNAL(currentIndexChanged(int)), this, SLOT(updateSmartFeeLabel()));
-        connect(ui->confTargetSelector, SIGNAL(currentIndexChanged(int)), this, SLOT(coinControlUpdateLabels()));
-        connect(ui->groupFee, SIGNAL(buttonClicked(int)), this, SLOT(updateFeeSectionControls()));
-        connect(ui->groupFee, SIGNAL(buttonClicked(int)), this, SLOT(coinControlUpdateLabels()));
-        connect(ui->customFee, SIGNAL(valueChanged()), this, SLOT(coinControlUpdateLabels()));
-        connect(ui->checkBoxMinimumFee, SIGNAL(stateChanged(int)), this, SLOT(setMinimumFee()));
-        connect(ui->checkBoxMinimumFee, SIGNAL(stateChanged(int)), this, SLOT(updateFeeSectionControls()));
-        connect(ui->checkBoxMinimumFee, SIGNAL(stateChanged(int)), this, SLOT(coinControlUpdateLabels()));
-        connect(ui->optInRBF, SIGNAL(stateChanged(int)), this, SLOT(updateSmartFeeLabel()));
-        connect(ui->optInRBF, SIGNAL(stateChanged(int)), this, SLOT(coinControlUpdateLabels()));
+        connect(ui->confTargetSelector, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), this, &SendCoinsDialog::updateSmartFeeLabel);
+        connect(ui->confTargetSelector, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), this, &SendCoinsDialog::coinControlUpdateLabels);
+        connect(ui->groupFee, static_cast<void (QButtonGroup::*)(int)>(&QButtonGroup::buttonClicked), this, &SendCoinsDialog::updateFeeSectionControls);
+        connect(ui->groupFee, static_cast<void (QButtonGroup::*)(int)>(&QButtonGroup::buttonClicked), this, &SendCoinsDialog::coinControlUpdateLabels);
+        connect(ui->customFee, &BitcoinAmountField::valueChanged, this, &SendCoinsDialog::coinControlUpdateLabels);
+        connect(ui->checkBoxMinimumFee, &QCheckBox::stateChanged, this, &SendCoinsDialog::setMinimumFee);
+        connect(ui->checkBoxMinimumFee, &QCheckBox::stateChanged, this, &SendCoinsDialog::updateFeeSectionControls);
+        connect(ui->checkBoxMinimumFee, &QCheckBox::stateChanged, this, &SendCoinsDialog::coinControlUpdateLabels);
+        connect(ui->optInRBF, &QCheckBox::stateChanged, this, &SendCoinsDialog::updateSmartFeeLabel);
+        connect(ui->optInRBF, &QCheckBox::stateChanged, this, &SendCoinsDialog::coinControlUpdateLabels);
         ui->customFee->setSingleStep(model->wallet().getRequiredFee(1000));
         updateFeeSectionControls();
         updateMinFeeLabel();
@@ -417,10 +417,10 @@ SendCoinsEntry *SendCoinsDialog::addEntry()
     SendCoinsEntry *entry = new SendCoinsEntry(platformStyle, this);
     entry->setModel(model);
     ui->entries->addWidget(entry);
-    connect(entry, SIGNAL(removeEntry(SendCoinsEntry*)), this, SLOT(removeEntry(SendCoinsEntry*)));
-    connect(entry, SIGNAL(useAvailableBalance(SendCoinsEntry*)), this, SLOT(useAvailableBalance(SendCoinsEntry*)));
-    connect(entry, SIGNAL(payAmountChanged()), this, SLOT(coinControlUpdateLabels()));
-    connect(entry, SIGNAL(subtractFeeFromAmountChanged()), this, SLOT(coinControlUpdateLabels()));
+    connect(entry, &SendCoinsEntry::removeEntry, this, &SendCoinsDialog::removeEntry);
+    connect(entry, &SendCoinsEntry::useAvailableBalance, this, &SendCoinsDialog::useAvailableBalance);
+    connect(entry, &SendCoinsEntry::payAmountChanged, this, &SendCoinsDialog::coinControlUpdateLabels);
+    connect(entry, &SendCoinsEntry::subtractFeeFromAmountChanged, this, &SendCoinsDialog::coinControlUpdateLabels);
 
     // Focus the field, so that entry can start immediately
     entry->clear();
@@ -897,7 +897,7 @@ SendConfirmationDialog::SendConfirmationDialog(const QString &title, const QStri
     setDefaultButton(QMessageBox::Cancel);
     yesButton = button(QMessageBox::Yes);
     updateYesButton();
-    connect(&countDownTimer, SIGNAL(timeout()), this, SLOT(countDown()));
+    connect(&countDownTimer, &QTimer::timeout, this, &SendConfirmationDialog::countDown);
 }
 
 int SendConfirmationDialog::exec()
diff --git a/src/qt/sendcoinsentry.cpp b/src/qt/sendcoinsentry.cpp
index d53f91dffa..b394ff3150 100644
--- a/src/qt/sendcoinsentry.cpp
+++ b/src/qt/sendcoinsentry.cpp
@@ -40,12 +40,12 @@ SendCoinsEntry::SendCoinsEntry(const PlatformStyle *_platformStyle, QWidget *par
     ui->payTo_is->setFont(GUIUtil::fixedPitchFont());
 
     // Connect signals
-    connect(ui->payAmount, SIGNAL(valueChanged()), this, SIGNAL(payAmountChanged()));
-    connect(ui->checkboxSubtractFeeFromAmount, SIGNAL(toggled(bool)), this, SIGNAL(subtractFeeFromAmountChanged()));
-    connect(ui->deleteButton, SIGNAL(clicked()), this, SLOT(deleteClicked()));
-    connect(ui->deleteButton_is, SIGNAL(clicked()), this, SLOT(deleteClicked()));
-    connect(ui->deleteButton_s, SIGNAL(clicked()), this, SLOT(deleteClicked()));
-    connect(ui->useAvailableBalanceButton, SIGNAL(clicked()), this, SLOT(useAvailableBalanceClicked()));
+    connect(ui->payAmount, &BitcoinAmountField::valueChanged, this, &SendCoinsEntry::payAmountChanged);
+    connect(ui->checkboxSubtractFeeFromAmount, &QCheckBox::toggled, this, &SendCoinsEntry::subtractFeeFromAmountChanged);
+    connect(ui->deleteButton, &QPushButton::clicked, this, &SendCoinsEntry::deleteClicked);
+    connect(ui->deleteButton_is, &QPushButton::clicked, this, &SendCoinsEntry::deleteClicked);
+    connect(ui->deleteButton_s, &QPushButton::clicked, this, &SendCoinsEntry::deleteClicked);
+    connect(ui->useAvailableBalanceButton, &QPushButton::clicked, this, &SendCoinsEntry::useAvailableBalanceClicked);
 }
 
 SendCoinsEntry::~SendCoinsEntry()
@@ -82,7 +82,7 @@ void SendCoinsEntry::setModel(WalletModel *_model)
     this->model = _model;
 
     if (_model && _model->getOptionsModel())
-        connect(_model->getOptionsModel(), SIGNAL(displayUnitChanged(int)), this, SLOT(updateDisplayUnit()));
+        connect(_model->getOptionsModel(), &OptionsModel::displayUnitChanged, this, &SendCoinsEntry::updateDisplayUnit);
 
     clear();
 }
diff --git a/src/qt/test/paymentservertests.cpp b/src/qt/test/paymentservertests.cpp
index e92f9d7a5b..5384b9e8b0 100644
--- a/src/qt/test/paymentservertests.cpp
+++ b/src/qt/test/paymentservertests.cpp
@@ -39,8 +39,8 @@ X509 *parse_b64der_cert(const char* cert_data)
 static SendCoinsRecipient handleRequest(PaymentServer* server, std::vector<unsigned char>& data)
 {
     RecipientCatcher sigCatcher;
-    QObject::connect(server, SIGNAL(receivedPaymentRequest(SendCoinsRecipient)),
-        &sigCatcher, SLOT(getRecipient(SendCoinsRecipient)));
+    QObject::connect(server, &PaymentServer::receivedPaymentRequest,
+        &sigCatcher, &RecipientCatcher::getRecipient);
 
     // Write data to a temp file:
     QTemporaryFile f;
@@ -57,8 +57,8 @@ static SendCoinsRecipient handleRequest(PaymentServer* server, std::vector<unsig
     // which will lead to a test failure anyway.
     QCoreApplication::sendEvent(&object, &event);
 
-    QObject::disconnect(server, SIGNAL(receivedPaymentRequest(SendCoinsRecipient)),
-        &sigCatcher, SLOT(getRecipient(SendCoinsRecipient)));
+    QObject::disconnect(server, &PaymentServer::receivedPaymentRequest,
+        &sigCatcher, &RecipientCatcher::getRecipient);
 
     // Return results from sigCatcher
     return sigCatcher.recipient;
diff --git a/src/qt/test/util.cpp b/src/qt/test/util.cpp
index 261caaaee5..0bd719326e 100644
--- a/src/qt/test/util.cpp
+++ b/src/qt/test/util.cpp
@@ -18,5 +18,5 @@ void ConfirmMessage(QString* text, int msec)
             }
         }
         delete callback;
-    }), SLOT(call()));
+    }), &Callback::call);
 }
diff --git a/src/qt/test/wallettests.cpp b/src/qt/test/wallettests.cpp
index c314dadde4..a0cfe8ae87 100644
--- a/src/qt/test/wallettests.cpp
+++ b/src/qt/test/wallettests.cpp
@@ -50,7 +50,7 @@ void ConfirmSend(QString* text = nullptr, bool cancel = false)
             }
         }
         delete callback;
-    }), SLOT(call()));
+    }), &Callback::call);
 }
 
 //! Send coins to address and return txid.
diff --git a/src/qt/trafficgraphwidget.cpp b/src/qt/trafficgraphwidget.cpp
index 35569149fc..f087e7569c 100644
--- a/src/qt/trafficgraphwidget.cpp
+++ b/src/qt/trafficgraphwidget.cpp
@@ -29,7 +29,7 @@ TrafficGraphWidget::TrafficGraphWidget(QWidget *parent) :
     clientModel(0)
 {
     timer = new QTimer(this);
-    connect(timer, SIGNAL(timeout()), SLOT(updateRates()));
+    connect(timer, &QTimer::timeout, this, &TrafficGraphWidget::updateRates);
 }
 
 void TrafficGraphWidget::setClientModel(ClientModel *model)
diff --git a/src/qt/transactiontablemodel.cpp b/src/qt/transactiontablemodel.cpp
index e100cac533..e379b70553 100644
--- a/src/qt/transactiontablemodel.cpp
+++ b/src/qt/transactiontablemodel.cpp
@@ -226,7 +226,7 @@ TransactionTableModel::TransactionTableModel(const PlatformStyle *_platformStyle
     columns << QString() << QString() << tr("Date") << tr("Type") << tr("Label") << BitcoinUnits::getAmountColumnTitle(walletModel->getOptionsModel()->getDisplayUnit());
     priv->refreshWallet(walletModel->wallet());
 
-    connect(walletModel->getOptionsModel(), SIGNAL(displayUnitChanged(int)), this, SLOT(updateDisplayUnit()));
+    connect(walletModel->getOptionsModel(), &OptionsModel::displayUnitChanged, this, &TransactionTableModel::updateDisplayUnit);
 
     subscribeToCoreSignals();
 }
diff --git a/src/qt/transactionview.cpp b/src/qt/transactionview.cpp
index 23c50f55ba..6d08a3b0fb 100644
--- a/src/qt/transactionview.cpp
+++ b/src/qt/transactionview.cpp
@@ -176,30 +176,31 @@ TransactionView::TransactionView(const PlatformStyle *platformStyle, QWidget *pa
     mapperThirdPartyTxUrls = new QSignalMapper(this);
 
     // Connect actions
-    connect(mapperThirdPartyTxUrls, SIGNAL(mapped(QString)), this, SLOT(openThirdPartyTxUrl(QString)));
-
-    connect(dateWidget, SIGNAL(activated(int)), this, SLOT(chooseDate(int)));
-    connect(typeWidget, SIGNAL(activated(int)), this, SLOT(chooseType(int)));
-    connect(watchOnlyWidget, SIGNAL(activated(int)), this, SLOT(chooseWatchonly(int)));
-    connect(amountWidget, SIGNAL(textChanged(QString)), amount_typing_delay, SLOT(start()));
-    connect(amount_typing_delay, SIGNAL(timeout()), this, SLOT(changedAmount()));
-    connect(search_widget, SIGNAL(textChanged(QString)), prefix_typing_delay, SLOT(start()));
-    connect(prefix_typing_delay, SIGNAL(timeout()), this, SLOT(changedSearch()));
-
-    connect(view, SIGNAL(doubleClicked(QModelIndex)), this, SIGNAL(doubleClicked(QModelIndex)));
-    connect(view, SIGNAL(customContextMenuRequested(QPoint)), this, SLOT(contextualMenu(QPoint)));
-
-    connect(bumpFeeAction, SIGNAL(triggered()), this, SLOT(bumpFee()));
-    connect(abandonAction, SIGNAL(triggered()), this, SLOT(abandonTx()));
-    connect(copyAddressAction, SIGNAL(triggered()), this, SLOT(copyAddress()));
-    connect(copyLabelAction, SIGNAL(triggered()), this, SLOT(copyLabel()));
-    connect(copyAmountAction, SIGNAL(triggered()), this, SLOT(copyAmount()));
-    connect(copyTxIDAction, SIGNAL(triggered()), this, SLOT(copyTxID()));
-    connect(copyTxHexAction, SIGNAL(triggered()), this, SLOT(copyTxHex()));
-    connect(copyTxPlainText, SIGNAL(triggered()), this, SLOT(copyTxPlainText()));
-    connect(editLabelAction, SIGNAL(triggered()), this, SLOT(editLabel()));
-    connect(showDetailsAction, SIGNAL(triggered()), this, SLOT(showDetails()));
-
+    connect(mapperThirdPartyTxUrls, static_cast<void (QSignalMapper::*)(const QString&)>(&QSignalMapper::mapped), this, &TransactionView::openThirdPartyTxUrl);
+
+    connect(dateWidget, static_cast<void (QComboBox::*)(int)>(&QComboBox::activated), this, &TransactionView::chooseDate);
+    connect(typeWidget, static_cast<void (QComboBox::*)(int)>(&QComboBox::activated), this, &TransactionView::chooseType);
+    connect(watchOnlyWidget, static_cast<void (QComboBox::*)(int)>(&QComboBox::activated), this, &TransactionView::chooseWatchonly);
+    connect(amountWidget, &QLineEdit::textChanged, amount_typing_delay, static_cast<void (QTimer::*)()>(&QTimer::start));
+    connect(amount_typing_delay, &QTimer::timeout, this, &TransactionView::changedAmount);
+    connect(search_widget, &QLineEdit::textChanged, prefix_typing_delay, static_cast<void (QTimer::*)()>(&QTimer::start));
+    connect(prefix_typing_delay, &QTimer::timeout, this, &TransactionView::changedSearch);
+
+    connect(view, &QTableView::doubleClicked, this, &TransactionView::doubleClicked);
+    connect(view, &QTableView::customContextMenuRequested, this, &TransactionView::contextualMenu);
+
+    connect(bumpFeeAction, &QAction::triggered, this, &TransactionView::bumpFee);
+    connect(abandonAction, &QAction::triggered, this, &TransactionView::abandonTx);
+    connect(copyAddressAction, &QAction::triggered, this, &TransactionView::copyAddress);
+    connect(copyLabelAction, &QAction::triggered, this, &TransactionView::copyLabel);
+    connect(copyAmountAction, &QAction::triggered, this, &TransactionView::copyAmount);
+    connect(copyTxIDAction, &QAction::triggered, this, &TransactionView::copyTxID);
+    connect(copyTxHexAction, &QAction::triggered, this, &TransactionView::copyTxHex);
+    connect(copyTxPlainText, &QAction::triggered, this, &TransactionView::copyTxPlainText);
+    connect(editLabelAction, &QAction::triggered, this, &TransactionView::editLabel);
+    connect(showDetailsAction, &QAction::triggered, this, &TransactionView::showDetails);
+    // Double-clicking on a transaction on the transaction history page shows details
+    connect(this, &TransactionView::doubleClicked, this, &TransactionView::showDetails);
     // Highlight transaction after fee bump
     connect(this, &TransactionView::bumpedFee, [this](const uint256& txid) {
       focusTransaction(txid);
@@ -249,7 +250,7 @@ void TransactionView::setModel(WalletModel *_model)
                     if (i == 0)
                         contextMenu->addSeparator();
                     contextMenu->addAction(thirdPartyTxUrlAction);
-                    connect(thirdPartyTxUrlAction, SIGNAL(triggered()), mapperThirdPartyTxUrls, SLOT(map()));
+                    connect(thirdPartyTxUrlAction, &QAction::triggered, mapperThirdPartyTxUrls, static_cast<void (QSignalMapper::*)()>(&QSignalMapper::map));
                     mapperThirdPartyTxUrls->setMapping(thirdPartyTxUrlAction, listUrls[i].trimmed());
                 }
             }
@@ -259,7 +260,7 @@ void TransactionView::setModel(WalletModel *_model)
         updateWatchOnlyColumn(_model->wallet().haveWatchOnly());
 
         // Watch-only signal
-        connect(_model, SIGNAL(notifyWatchonlyChanged(bool)), this, SLOT(updateWatchOnlyColumn(bool)));
+        connect(_model, &WalletModel::notifyWatchonlyChanged, this, &TransactionView::updateWatchOnlyColumn);
     }
 }
 
@@ -573,8 +574,8 @@ QWidget *TransactionView::createDateRangeWidget()
     dateRangeWidget->setVisible(false);
 
     // Notify on change
-    connect(dateFrom, SIGNAL(dateChanged(QDate)), this, SLOT(dateRangeChanged()));
-    connect(dateTo, SIGNAL(dateChanged(QDate)), this, SLOT(dateRangeChanged()));
+    connect(dateFrom, &QDateTimeEdit::dateChanged, this, &TransactionView::dateRangeChanged);
+    connect(dateTo, &QDateTimeEdit::dateChanged, this, &TransactionView::dateRangeChanged);
 
     return dateRangeWidget;
 }
diff --git a/src/qt/walletframe.cpp b/src/qt/walletframe.cpp
index e8fd83d427..d15bd95b8e 100644
--- a/src/qt/walletframe.cpp
+++ b/src/qt/walletframe.cpp
@@ -68,9 +68,11 @@ bool WalletFrame::addWallet(WalletModel *walletModel)
     mapWalletViews[name] = walletView;
 
     // Ensure a walletView is able to show the main window
-    connect(walletView, SIGNAL(showNormalIfMinimized()), gui, SLOT(showNormalIfMinimized()));
+    connect(walletView, &WalletView::showNormalIfMinimized, [this]{
+      gui->showNormalIfMinimized();
+    });
 
-    connect(walletView, SIGNAL(outOfSyncWarningClicked()), this, SLOT(outOfSyncWarningClicked()));
+    connect(walletView, &WalletView::outOfSyncWarningClicked, this, &WalletFrame::outOfSyncWarningClicked);
 
     return true;
 }
diff --git a/src/qt/walletmodel.cpp b/src/qt/walletmodel.cpp
index d91cdcdc1f..18a5bda9c3 100644
--- a/src/qt/walletmodel.cpp
+++ b/src/qt/walletmodel.cpp
@@ -44,7 +44,7 @@ WalletModel::WalletModel(std::unique_ptr<interfaces::Wallet> wallet, interfaces:
 
     // This timer will be fired repeatedly to update the balance
     pollTimer = new QTimer(this);
-    connect(pollTimer, SIGNAL(timeout()), this, SLOT(pollBalanceChanged()));
+    connect(pollTimer, &QTimer::timeout, this, &WalletModel::pollBalanceChanged);
     pollTimer->start(MODEL_UPDATE_DELAY);
 
     subscribeToCoreSignals();
diff --git a/src/qt/walletview.cpp b/src/qt/walletview.cpp
index 9af29b5d60..053e951921 100644
--- a/src/qt/walletview.cpp
+++ b/src/qt/walletview.cpp
@@ -66,22 +66,20 @@ WalletView::WalletView(const PlatformStyle *_platformStyle, QWidget *parent):
     addWidget(sendCoinsPage);
 
     // Clicking on a transaction on the overview pre-selects the transaction on the transaction history page
-    connect(overviewPage, SIGNAL(transactionClicked(QModelIndex)), transactionView, SLOT(focusTransaction(QModelIndex)));
-    connect(overviewPage, SIGNAL(outOfSyncWarningClicked()), this, SLOT(requestedSyncWarningInfo()));
+    connect(overviewPage, &OverviewPage::transactionClicked, transactionView, static_cast<void (TransactionView::*)(const QModelIndex&)>(&TransactionView::focusTransaction));
 
-    // Highlight transaction after send
-    connect(sendCoinsPage, SIGNAL(coinsSent(uint256)), transactionView, SLOT(focusTransaction(uint256)));
+    connect(overviewPage, &OverviewPage::outOfSyncWarningClicked, this, &WalletView::requestedSyncWarningInfo);
 
-    // Double-clicking on a transaction on the transaction history page shows details
-    connect(transactionView, SIGNAL(doubleClicked(QModelIndex)), transactionView, SLOT(showDetails()));
+    // Highlight transaction after send
+    connect(sendCoinsPage, &SendCoinsDialog::coinsSent, transactionView, static_cast<void (TransactionView::*)(const uint256&)>(&TransactionView::focusTransaction));
 
     // Clicking on "Export" allows to export the transaction list
-    connect(exportButton, SIGNAL(clicked()), transactionView, SLOT(exportClicked()));
+    connect(exportButton, &QPushButton::clicked, transactionView, &TransactionView::exportClicked);
 
     // Pass through messages from sendCoinsPage
-    connect(sendCoinsPage, SIGNAL(message(QString,QString,unsigned int)), this, SIGNAL(message(QString,QString,unsigned int)));
+    connect(sendCoinsPage, &SendCoinsDialog::message, this, &WalletView::message);
     // Pass through messages from transactionView
-    connect(transactionView, SIGNAL(message(QString,QString,unsigned int)), this, SIGNAL(message(QString,QString,unsigned int)));
+    connect(transactionView, &TransactionView::message, this, &WalletView::message);
 }
 
 WalletView::~WalletView()
@@ -93,22 +91,24 @@ void WalletView::setBitcoinGUI(BitcoinGUI *gui)
     if (gui)
     {
         // Clicking on a transaction on the overview page simply sends you to transaction history page
-        connect(overviewPage, SIGNAL(transactionClicked(QModelIndex)), gui, SLOT(gotoHistoryPage()));
+        connect(overviewPage, &OverviewPage::transactionClicked, gui, &BitcoinGUI::gotoHistoryPage);
 
         // Navigate to transaction history page after send
-        connect(sendCoinsPage, SIGNAL(coinsSent(uint256)), gui, SLOT(gotoHistoryPage()));
+        connect(sendCoinsPage, &SendCoinsDialog::coinsSent, gui, &BitcoinGUI::gotoHistoryPage);
 
         // Receive and report messages
-        connect(this, SIGNAL(message(QString,QString,unsigned int)), gui, SLOT(message(QString,QString,unsigned int)));
+        connect(this, &WalletView::message, [gui](const QString &title, const QString &message, unsigned int style) {
+            gui->message(title, message, style);
+        });
 
         // Pass through encryption status changed signals
-        connect(this, SIGNAL(encryptionStatusChanged()), gui, SLOT(updateWalletStatus()));
+        connect(this, &WalletView::encryptionStatusChanged, gui, &BitcoinGUI::updateWalletStatus);
 
         // Pass through transaction notifications
-        connect(this, SIGNAL(incomingTransaction(QString,int,CAmount,QString,QString,QString,QString)), gui, SLOT(incomingTransaction(QString,int,CAmount,QString,QString,QString,QString)));
+        connect(this, &WalletView::incomingTransaction, gui, &BitcoinGUI::incomingTransaction);
 
         // Connect HD enabled state signal
-        connect(this, SIGNAL(hdEnabledStatusChanged()), gui, SLOT(updateWalletStatus()));
+        connect(this, &WalletView::hdEnabledStatusChanged, gui, &BitcoinGUI::updateWalletStatus);
     }
 }
 
@@ -135,24 +135,23 @@ void WalletView::setWalletModel(WalletModel *_walletModel)
     if (_walletModel)
     {
         // Receive and pass through messages from wallet model
-        connect(_walletModel, SIGNAL(message(QString,QString,unsigned int)), this, SIGNAL(message(QString,QString,unsigned int)));
+        connect(_walletModel, &WalletModel::message, this, &WalletView::message);
 
         // Handle changes in encryption status
-        connect(_walletModel, SIGNAL(encryptionStatusChanged()), this, SIGNAL(encryptionStatusChanged()));
+        connect(_walletModel, &WalletModel::encryptionStatusChanged, this, &WalletView::encryptionStatusChanged);
         updateEncryptionStatus();
 
         // update HD status
         Q_EMIT hdEnabledStatusChanged();
 
         // Balloon pop-up for new transaction
-        connect(_walletModel->getTransactionTableModel(), SIGNAL(rowsInserted(QModelIndex,int,int)),
-                this, SLOT(processNewTransaction(QModelIndex,int,int)));
+        connect(_walletModel->getTransactionTableModel(), &TransactionTableModel::rowsInserted, this, &WalletView::processNewTransaction);
 
         // Ask for passphrase if needed
-        connect(_walletModel, SIGNAL(requireUnlock()), this, SLOT(unlockWallet()));
+        connect(_walletModel, &WalletModel::requireUnlock, this, &WalletView::unlockWallet);
 
         // Show progress dialog
-        connect(_walletModel, SIGNAL(showProgress(QString,int)), this, SLOT(showProgress(QString,int)));
+        connect(_walletModel, &WalletModel::showProgress, this, &WalletView::showProgress);
     }
 }
 
diff --git a/test/lint/lint-qt.sh b/test/lint/lint-qt.sh
new file mode 100755
index 0000000000..2e77682aa2
--- /dev/null
+++ b/test/lint/lint-qt.sh
@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+#
+# Copyright (c) 2018 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#
+# Check for SIGNAL/SLOT connect style, removed since Qt4 support drop.
+
+export LC_ALL=C
+
+EXIT_CODE=0
+
+OUTPUT=$(git grep -E '(SIGNAL|, ?SLOT)\(' -- src/qt)
+if [[ ${OUTPUT} != "" ]]; then
+    echo "Use Qt5 connect style in:"
+    echo "$OUTPUT"
+    EXIT_CODE=1
+fi
+
+exit ${EXIT_CODE}