[Qt] fix slot connection problems when no wallet is loaded

- guard 4 connect calls by an #ifdef when no wallet is loaded to fix "No
  such slot" warnings
- also add comments when #ifdef ENABLE_WALLET end
- fixes #5175

src/qt/bitcoingui.cpp

@@ -19,7 +19,7 @@
 #ifdef ENABLE_WALLET
 #include "walletframe.h"
 #include "walletmodel.h"
-#endif
+#endif // ENABLE_WALLET
 
 #ifdef Q_OS_MAC
 #include "macdockiconhandler.h"
@@ -106,7 +106,7 @@ BitcoinGUI::BitcoinGUI(const NetworkStyle *networkStyle, QWidget *parent) :
     bool enableWallet = !GetBoolArg("-disablewallet", false);
 #else
     bool enableWallet = false;
-#endif
+#endif // ENABLE_WALLET
     if(enableWallet)
     {
         windowTitle += tr("Wallet");
@@ -136,7 +136,7 @@ BitcoinGUI::BitcoinGUI(const NetworkStyle *networkStyle, QWidget *parent) :
         walletFrame = new WalletFrame(this);
         setCentralWidget(walletFrame);
     } else
-#endif
+#endif // ENABLE_WALLET
     {
         /* When compiled without wallet or -disablewallet is provided,
          * the central widget is the rpc console.
@@ -268,6 +268,7 @@ void BitcoinGUI::createActions(const NetworkStyle *networkStyle)
     historyAction->setShortcut(QKeySequence(Qt::ALT + Qt::Key_4));
     tabGroup->addAction(historyAction);
 
+#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()));
@@ -278,6 +279,7 @@ void BitcoinGUI::createActions(const NetworkStyle *networkStyle)
     connect(receiveCoinsAction, SIGNAL(triggered()), this, SLOT(gotoReceiveCoinsPage()));
     connect(historyAction, SIGNAL(triggered()), this, SLOT(showNormalIfMinimized()));
     connect(historyAction, SIGNAL(triggered()), this, SLOT(gotoHistoryPage()));
+#endif // ENABLE_WALLET
 
     quitAction = new QAction(QIcon(":/icons/quit"), tr("E&xit"), this);
     quitAction->setStatusTip(tr("Quit application"));
@@ -343,7 +345,7 @@ void BitcoinGUI::createActions(const NetworkStyle *networkStyle)
         connect(usedReceivingAddressesAction, SIGNAL(triggered()), walletFrame, SLOT(usedReceivingAddresses()));
         connect(openAction, SIGNAL(triggered()), this, SLOT(openClicked()));
     }
-#endif
+#endif // ENABLE_WALLET
 }
 
 void BitcoinGUI::createMenuBar()
@@ -433,7 +435,7 @@ void BitcoinGUI::setClientModel(ClientModel *clientModel)
         {
             walletFrame->setClientModel(clientModel);
         }
-#endif
+#endif // ENABLE_WALLET
         unitDisplayControl->setOptionsModel(clientModel->getOptionsModel());
     } else {
         // Disable possibility to show main window via action
@@ -469,7 +471,7 @@ void BitcoinGUI::removeAllWallets()
     setWalletActionsEnabled(false);
     walletFrame->removeAllWallets();
 }
-#endif
+#endif // ENABLE_WALLET
 
 void BitcoinGUI::setWalletActionsEnabled(bool enabled)
 {
@@ -616,7 +618,7 @@ void BitcoinGUI::gotoVerifyMessageTab(QString addr)
 {
     if (walletFrame) walletFrame->gotoVerifyMessageTab(addr);
 }
-#endif
+#endif // ENABLE_WALLET
 
 void BitcoinGUI::setNumConnections(int count)
 {
@@ -676,7 +678,7 @@ void BitcoinGUI::setNumBlocks(int count)
 #ifdef ENABLE_WALLET
         if(walletFrame)
             walletFrame->showOutOfSyncWarning(false);
-#endif
+#endif // ENABLE_WALLET
 
         progressBarLabel->setVisible(false);
         progressBar->setVisible(false);
@@ -727,7 +729,7 @@ void BitcoinGUI::setNumBlocks(int count)
 #ifdef ENABLE_WALLET
         if(walletFrame)
             walletFrame->showOutOfSyncWarning(true);
-#endif
+#endif // ENABLE_WALLET
 
         tooltip += QString("<br>");
         tooltip += tr("Last received block was generated %1 ago.").arg(timeBehindText);
@@ -850,7 +852,7 @@ void BitcoinGUI::incomingTransaction(const QString& date, int unit, const CAmoun
                   .arg(type)
                   .arg(address), CClientUIInterface::MSG_INFORMATION);
 }
-#endif
+#endif // ENABLE_WALLET
 
 void BitcoinGUI::dragEnterEvent(QDragEnterEvent *event)
 {
@@ -924,7 +926,7 @@ void BitcoinGUI::setEncryptionStatus(int status)
         break;
     }
 }
-#endif
+#endif // ENABLE_WALLET
 
 void BitcoinGUI::showNormalIfMinimized(bool fToggleHidden)
 {

src/qt/bitcoingui.h

@@ -63,7 +63,7 @@ public:
     bool addWallet(const QString& name, WalletModel *walletModel);
     bool setCurrentWallet(const QString& name);
     void removeAllWallets();
-#endif
+#endif // ENABLE_WALLET
 
 protected:
     void changeEvent(QEvent *e);
@@ -163,7 +163,7 @@ public slots:
 
     /** Show incoming transaction notification for new transactions. */
     void incomingTransaction(const QString& date, int unit, const CAmount& amount, const QString& type, const QString& address);
-#endif
+#endif // ENABLE_WALLET
 
 private slots:
 #ifdef ENABLE_WALLET
@@ -183,7 +183,7 @@ private slots:
 
     /** Show open dialog */
     void openClicked();
-#endif
+#endif // ENABLE_WALLET
     /** Show configuration dialog */
     void optionsClicked();
     /** Show about dialog */