text: // Copyright (c) 2011-2017 The Bitcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include <qt/bitcoingui.h>
  
  #include <qt/bitcoinunits.h>
  #include <qt/clientmodel.h>
  #include <qt/guiconstants.h>
  #include <qt/guiutil.h>
  #include <qt/modaloverlay.h>
  #include <qt/networkstyle.h>
  #include <qt/notificator.h>
  #include <qt/openuridialog.h>
  #include <qt/optionsdialog.h>
  #include <qt/optionsmodel.h>
  #include <qt/platformstyle.h>
  #include <qt/rpcconsole.h>
  #include <qt/utilitydialog.h>
  
  #ifdef ENABLE_WALLET
  #include <qt/walletframe.h>
  #include <qt/walletmodel.h>
  #endif // ENABLE_WALLET
  
  #ifdef Q_OS_MAC
  #include <qt/macdockiconhandler.h>
  #endif
  
  #include <chainparams.h>
  #include <init.h>
  #include <ui_interface.h>
  #include <util.h>
  
  #include <iostream>
  
  #include <QAction>
  #include <QApplication>
  #include <QDateTime>
  #include <QDesktopWidget>
  #include <QDragEnterEvent>
  #include <QListWidget>
  #include <QMenuBar>
  #include <QMessageBox>
  #include <QMimeData>
  #include <QProgressDialog>
  #include <QSettings>
  #include <QShortcut>
  #include <QStackedWidget>
  #include <QStatusBar>
  #include <QStyle>
  #include <QTimer>
  #include <QToolBar>
  #include <QVBoxLayout>
  
  #if QT_VERSION < 0x050000
  #include <QTextDocument>
  #include <QUrl>
  #else
  #include <QUrlQuery>
  #endif
  
  const std::string BitcoinGUI::DEFAULT_UIPLATFORM =
  #if defined(Q_OS_MAC)
          "macosx"
  #elif defined(Q_OS_WIN)
          "windows"
  #else
          "other"
  #endif
          ;
  
  /** Display name for default wallet name. Uses tilde to avoid name
   * collisions in the future with additional wallets */
  const QString BitcoinGUI::DEFAULT_WALLET = "~Default";
  
  BitcoinGUI::BitcoinGUI(const PlatformStyle *_platformStyle, const NetworkStyle *networkStyle, QWidget *parent) :
      QMainWindow(parent),
      enableWallet(false),
      clientModel(0),
      walletFrame(0),
      unitDisplayControl(0),
      labelWalletEncryptionIcon(0),
      labelWalletHDStatusIcon(0),
      connectionsControl(0),
      labelBlocksIcon(0),
      progressBarLabel(0),
      progressBar(0),
      progressDialog(0),
      appMenuBar(0),
      overviewAction(0),
      historyAction(0),
      quitAction(0),
      sendCoinsAction(0),
      sendCoinsMenuAction(0),
      usedSendingAddressesAction(0),
      usedReceivingAddressesAction(0),
      signMessageAction(0),
      verifyMessageAction(0),
      aboutAction(0),
      receiveCoinsAction(0),
      receiveCoinsMenuAction(0),
      optionsAction(0),
      toggleHideAction(0),
      encryptWalletAction(0),
      backupWalletAction(0),
      changePassphraseAction(0),
      aboutQtAction(0),
      openRPCConsoleAction(0),
      openAction(0),
      showHelpMessageAction(0),
      trayIcon(0),
      trayIconMenu(0),
      notificator(0),
      rpcConsole(0),
      helpMessageDialog(0),
      modalOverlay(0),
      prevBlocks(0),
      spinnerFrame(0),
      platformStyle(_platformStyle)
  {
      QSettings settings;
      if (!restoreGeometry(settings.value("MainWindowGeometry").toByteArray())) {
          // Restore failed (perhaps missing setting), center the window
          move(QApplication::desktop()->availableGeometry().center() - frameGeometry().center());
      }
  
      QString windowTitle = tr(PACKAGE_NAME) + " - ";
  #ifdef ENABLE_WALLET
      enableWallet = WalletModel::isWalletEnabled();
  #endif // ENABLE_WALLET
      if(enableWallet)
      {
          windowTitle += tr("Wallet");
      } else {
          windowTitle += tr("Node");
      }
      windowTitle += " " + networkStyle->getTitleAddText();
  #ifndef Q_OS_MAC
      QApplication::setWindowIcon(networkStyle->getTrayAndWindowIcon());
      setWindowIcon(networkStyle->getTrayAndWindowIcon());
  #else
      MacDockIconHandler::instance()->setIcon(networkStyle->getAppIcon());
  #endif
      setWindowTitle(windowTitle);
  
  #if defined(Q_OS_MAC) && QT_VERSION < 0x050000
      // This property is not implemented in Qt 5. Setting it has no effect.
      // A replacement API (QtMacUnifiedToolBar) is available in QtMacExtras.
      setUnifiedTitleAndToolBarOnMac(true);
  #endif
  
      rpcConsole = new RPCConsole(_platformStyle, 0);
      helpMessageDialog = new HelpMessageDialog(this, false);
  #ifdef ENABLE_WALLET
      if(enableWallet)
      {
          /** Create wallet frame and make it the central widget */
          walletFrame = new WalletFrame(_platformStyle, this);
          setCentralWidget(walletFrame);
      } else
  #endif // ENABLE_WALLET
      {
          /* When compiled without wallet or -disablewallet is provided,
           * the central widget is the rpc console.
           */
          setCentralWidget(rpcConsole);
      }
  
      // Accept D&D of URIs
      setAcceptDrops(true);
  
      // Create actions for the toolbar, menu bar and tray/dock icon
      // Needs walletFrame to be initialized
      createActions();
  
      // Create application menu bar
      createMenuBar();
  
      // Create the toolbars
      createToolBars();
  
      // Create system tray icon and notification
      createTrayIcon(networkStyle);
  
      // Create status bar
      statusBar();
  
      // Disable size grip because it looks ugly and nobody needs it
      statusBar()->setSizeGripEnabled(false);
  
      // Status bar notification icons
      QFrame *frameBlocks = new QFrame();
      frameBlocks->setContentsMargins(0,0,0,0);
      frameBlocks->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Preferred);
      QHBoxLayout *frameBlocksLayout = new QHBoxLayout(frameBlocks);
      frameBlocksLayout->setContentsMargins(3,0,3,0);
      frameBlocksLayout->setSpacing(3);
      unitDisplayControl = new UnitDisplayStatusBarControl(platformStyle);
      labelWalletEncryptionIcon = new QLabel();
      labelWalletHDStatusIcon = new QLabel();
      connectionsControl = new GUIUtil::ClickableLabel();
      labelBlocksIcon = new GUIUtil::ClickableLabel();
      if(enableWallet)
      {
          frameBlocksLayout->addStretch();
          frameBlocksLayout->addWidget(unitDisplayControl);
          frameBlocksLayout->addStretch();
          frameBlocksLayout->addWidget(labelWalletEncryptionIcon);
          frameBlocksLayout->addWidget(labelWalletHDStatusIcon);
      }
      frameBlocksLayout->addStretch();
      frameBlocksLayout->addWidget(connectionsControl);
      frameBlocksLayout->addStretch();
      frameBlocksLayout->addWidget(labelBlocksIcon);
      frameBlocksLayout->addStretch();
  
      // Progress bar and label for blocks download
      progressBarLabel = new QLabel();
      progressBarLabel->setVisible(false);
      progressBar = new GUIUtil::ProgressBar();
      progressBar->setAlignment(Qt::AlignCenter);
      progressBar->setVisible(false);
  
      // Override style sheet for progress bar for styles that have a segmented progress bar,
      // as they make the text unreadable (workaround for issue #1071)
      // See https://qt-project.org/doc/qt-4.8/gallery.html
      QString curStyle = QApplication::style()->metaObject()->className();
      if(curStyle == "QWindowsStyle" || curStyle == "QWindowsXPStyle")
      {
          progressBar->setStyleSheet("QProgressBar { background-color: #e8e8e8; border: 1px solid grey; border-radius: 7px; padding: 1px; text-align: center; } QProgressBar::chunk { background: QLinearGradient(x1: 0, y1: 0, x2: 1, y2: 0, stop: 0 #FF8000, stop: 1 orange); border-radius: 7px; margin: 0px; }");
      }
  
      statusBar()->addWidget(progressBarLabel);
      statusBar()->addWidget(progressBar);
      statusBar()->addPermanentWidget(frameBlocks);
  
      // Install event filter to be able to catch status tip events (QEvent::StatusTip)
      this->installEventFilter(this);
  
      // Initially wallet actions should be disabled
      setWalletActionsEnabled(false);
  
      // Subscribe to notifications from core
      subscribeToCoreSignals();
  
      connect(connectionsControl, SIGNAL(clicked(QPoint)), this, SLOT(toggleNetworkActive()));
  
      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()));
      }
  #endif
  }
  
  BitcoinGUI::~BitcoinGUI()
  {
      // Unsubscribe from notifications from core
      unsubscribeFromCoreSignals();
  
      QSettings settings;
      settings.setValue("MainWindowGeometry", saveGeometry());
      if(trayIcon) // Hide tray icon, as deleting will let it linger until quit (on Ubuntu)
          trayIcon->hide();
  #ifdef Q_OS_MAC
      delete appMenuBar;
      MacDockIconHandler::cleanup();
  #endif
  
      delete rpcConsole;
  }
  
  void BitcoinGUI::createActions()
  {
      QActionGroup *tabGroup = new QActionGroup(this);
  
      overviewAction = new QAction(platformStyle->SingleColorIcon(":/icons/overview"), tr("&Overview"), this);
      overviewAction->setStatusTip(tr("Show general overview of wallet"));
      overviewAction->setToolTip(overviewAction->statusTip());
      overviewAction->setCheckable(true);
      overviewAction->setShortcut(QKeySequence(Qt::ALT + Qt::Key_1));
      tabGroup->addAction(overviewAction);
  
      sendCoinsAction = new QAction(platformStyle->SingleColorIcon(":/icons/send"), tr("&Send"), this);
      sendCoinsAction->setStatusTip(tr("Send coins to a Bintancoin address"));
      sendCoinsAction->setToolTip(sendCoinsAction->statusTip());
      sendCoinsAction->setCheckable(true);
      sendCoinsAction->setShortcut(QKeySequence(Qt::ALT + Qt::Key_2));
      tabGroup->addAction(sendCoinsAction);
  
      sendCoinsMenuAction = new QAction(platformStyle->TextColorIcon(":/icons/send"), sendCoinsAction->text(), this);
      sendCoinsMenuAction->setStatusTip(sendCoinsAction->statusTip());
      sendCoinsMenuAction->setToolTip(sendCoinsMenuAction->statusTip());
  
      receiveCoinsAction = new QAction(platformStyle->SingleColorIcon(":/icons/receiving_addresses"), tr("&Receive"), this);
      receiveCoinsAction->setStatusTip(tr("Request payments (generates QR codes and Bintancoin: URIs)"));
      receiveCoinsAction->setToolTip(receiveCoinsAction->statusTip());
      receiveCoinsAction->setCheckable(true);
      receiveCoinsAction->setShortcut(QKeySequence(Qt::ALT + Qt::Key_3));
      tabGroup->addAction(receiveCoinsAction);
  
      receiveCoinsMenuAction = new QAction(platformStyle->TextColorIcon(":/icons/receiving_addresses"), receiveCoinsAction->text(), this);
      receiveCoinsMenuAction->setStatusTip(receiveCoinsAction->statusTip());
      receiveCoinsMenuAction->setToolTip(receiveCoinsMenuAction->statusTip());
  
      historyAction = new QAction(platformStyle->SingleColorIcon(":/icons/history"), tr("&Transactions"), this);
      historyAction->setStatusTip(tr("Browse transaction history"));
      historyAction->setToolTip(historyAction->statusTip());
      historyAction->setCheckable(true);
      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()));
      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()));
  #endif // ENABLE_WALLET
  
      quitAction = new QAction(platformStyle->TextColorIcon(":/icons/quit"), tr("E&xit"), this);
      quitAction->setStatusTip(tr("Quit application"));
      quitAction->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_Q));
      quitAction->setMenuRole(QAction::QuitRole);
      aboutAction = new QAction(platformStyle->TextColorIcon(":/icons/about"), tr("&About %1").arg(tr(PACKAGE_NAME)), this);
      aboutAction->setStatusTip(tr("Show information about %1").arg(tr(PACKAGE_NAME)));
      aboutAction->setMenuRole(QAction::AboutRole);
      aboutAction->setEnabled(false);
      aboutQtAction = new QAction(platformStyle->TextColorIcon(":/icons/about_qt"), tr("About &Qt"), this);
      aboutQtAction->setStatusTip(tr("Show information about Qt"));
      aboutQtAction->setMenuRole(QAction::AboutQtRole);
      optionsAction = new QAction(platformStyle->TextColorIcon(":/icons/options"), tr("&Options..."), this);
      optionsAction->setStatusTip(tr("Modify configuration options for %1").arg(tr(PACKAGE_NAME)));
      optionsAction->setMenuRole(QAction::PreferencesRole);
      optionsAction->setEnabled(false);
      toggleHideAction = new QAction(platformStyle->TextColorIcon(":/icons/about"), tr("&Show / Hide"), this);
      toggleHideAction->setStatusTip(tr("Show or hide the main Window"));
  
      encryptWalletAction = new QAction(platformStyle->TextColorIcon(":/icons/lock_closed"), tr("&Encrypt Wallet..."), this);
      encryptWalletAction->setStatusTip(tr("Encrypt the private keys that belong to your wallet"));
      encryptWalletAction->setCheckable(true);
      backupWalletAction = new QAction(platformStyle->TextColorIcon(":/icons/filesave"), tr("&Backup Wallet..."), this);
      backupWalletAction->setStatusTip(tr("Backup wallet to another location"));
      changePassphraseAction = new QAction(platformStyle->TextColorIcon(":/icons/key"), tr("&Change Passphrase..."), this);
      changePassphraseAction->setStatusTip(tr("Change the passphrase used for wallet encryption"));
      signMessageAction = new QAction(platformStyle->TextColorIcon(":/icons/edit"), tr("Sign &message..."), this);
      signMessageAction->setStatusTip(tr("Sign messages with your Bintancoin addresses to prove you own them"));
      verifyMessageAction = new QAction(platformStyle->TextColorIcon(":/icons/verify"), tr("&Verify message..."), this);
      verifyMessageAction->setStatusTip(tr("Verify messages to ensure they were signed with specified Bintancoin addresses"));
  
      openRPCConsoleAction = new QAction(platformStyle->TextColorIcon(":/icons/debugwindow"), tr("&Debug window"), this);
      openRPCConsoleAction->setStatusTip(tr("Open debugging and diagnostic console"));
      // initially disable the debug window menu item
      openRPCConsoleAction->setEnabled(false);
  
      usedSendingAddressesAction = new QAction(platformStyle->TextColorIcon(":/icons/address-book"), tr("&Sending addresses..."), this);
      usedSendingAddressesAction->setStatusTip(tr("Show the list of used sending addresses and labels"));
      usedReceivingAddressesAction = new QAction(platformStyle->TextColorIcon(":/icons/address-book"), tr("&Receiving addresses..."), this);
      usedReceivingAddressesAction->setStatusTip(tr("Show the list of used receiving addresses and labels"));
  
      openAction = new QAction(platformStyle->TextColorIcon(":/icons/open"), tr("Open &URI..."), this);
      openAction->setStatusTip(tr("Open a bintancoin: URI or payment request"));
  
      showHelpMessageAction = new QAction(platformStyle->TextColorIcon(":/icons/info"), tr("&Command-line options"), this);
      showHelpMessageAction->setMenuRole(QAction::NoRole);
      showHelpMessageAction->setStatusTip(tr("Show the %1 help message to get a list with possible Bintancoin 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()));
      // prevents an open debug window from becoming stuck/unusable on client shutdown
      connect(quitAction, SIGNAL(triggered()), rpcConsole, SLOT(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()));
      }
  #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()));
  }
  
  void BitcoinGUI::createMenuBar()
  {
  #ifdef Q_OS_MAC
      // Create a decoupled menu bar on Mac which stays even if the window is closed
      appMenuBar = new QMenuBar();
  #else
      // Get the main window's menu bar on other platforms
      appMenuBar = menuBar();
  #endif
  
      // Configure the menus
      QMenu *file = appMenuBar->addMenu(tr("&File"));
      if(walletFrame)
      {
          file->addAction(openAction);
          file->addAction(backupWalletAction);
          file->addAction(signMessageAction);
          file->addAction(verifyMessageAction);
          file->addSeparator();
          file->addAction(usedSendingAddressesAction);
          file->addAction(usedReceivingAddressesAction);
          file->addSeparator();
      }
      file->addAction(quitAction);
  
      QMenu *settings = appMenuBar->addMenu(tr("&Settings"));
      if(walletFrame)
      {
          settings->addAction(encryptWalletAction);
          settings->addAction(changePassphraseAction);
          settings->addSeparator();
      }
      settings->addAction(optionsAction);
  
      QMenu *help = appMenuBar->addMenu(tr("&Help"));
      if(walletFrame)
      {
          help->addAction(openRPCConsoleAction);
      }
      help->addAction(showHelpMessageAction);
      help->addSeparator();
      help->addAction(aboutAction);
      help->addAction(aboutQtAction);
  }
  
  void BitcoinGUI::createToolBars()
  {
      if(walletFrame)
      {
          QToolBar *toolbar = addToolBar(tr("Tabs toolbar"));
          toolbar->setContextMenuPolicy(Qt::PreventContextMenu);
          toolbar->setMovable(false);
          toolbar->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
          toolbar->addAction(overviewAction);
          toolbar->addAction(sendCoinsAction);
          toolbar->addAction(receiveCoinsAction);
          toolbar->addAction(historyAction);
          overviewAction->setChecked(true);
      }
  }
  
  void BitcoinGUI::setClientModel(ClientModel *_clientModel)
  {
      this->clientModel = _clientModel;
      if(_clientModel)
      {
          // Create system tray menu (or setup the dock menu) that late to prevent users from calling actions,
          // while the client has not yet fully loaded
          createTrayIconMenu();
  
          // 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)));
  
          modalOverlay->setKnownBestHeight(_clientModel->getHeaderTipHeight(), QDateTime::fromTime_t(_clientModel->getHeaderTipTime()));
          setNumBlocks(_clientModel->getNumBlocks(), _clientModel->getLastBlockDate(), _clientModel->getVerificationProgress(nullptr), false);
          connect(_clientModel, SIGNAL(numBlocksChanged(int,QDateTime,double,bool)), this, SLOT(setNumBlocks(int,QDateTime,double,bool)));
  
          // Receive and report messages from client model
          connect(_clientModel, SIGNAL(message(QString,QString,unsigned int)), this, SLOT(message(QString,QString,unsigned int)));
  
          // Show progress dialog
          connect(_clientModel, SIGNAL(showProgress(QString,int)), this, SLOT(showProgress(QString,int)));
  
          rpcConsole->setClientModel(_clientModel);
  #ifdef ENABLE_WALLET
          if(walletFrame)
          {
              walletFrame->setClientModel(_clientModel);
          }
  #endif // ENABLE_WALLET
          unitDisplayControl->setOptionsModel(_clientModel->getOptionsModel());
          
          OptionsModel* optionsModel = _clientModel->getOptionsModel();
          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)));
          
              // initialize the disable state of the tray icon with the current value in the model.
              setTrayIconVisible(optionsModel->getHideTrayIcon());
          }
      } else {
          // Disable possibility to show main window via action
          toggleHideAction->setEnabled(false);
          if(trayIconMenu)
          {
              // Disable context menu on tray icon
              trayIconMenu->clear();
          }
          // Propagate cleared model to child objects
          rpcConsole->setClientModel(nullptr);
  #ifdef ENABLE_WALLET
          if (walletFrame)
          {
              walletFrame->setClientModel(nullptr);
          }
  #endif // ENABLE_WALLET
          unitDisplayControl->setOptionsModel(nullptr);
      }
  }
  
  #ifdef ENABLE_WALLET
  bool BitcoinGUI::addWallet(const QString& name, WalletModel *walletModel)
  {
      if(!walletFrame)
          return false;
      setWalletActionsEnabled(true);
      return walletFrame->addWallet(name, walletModel);
  }
  
  bool BitcoinGUI::setCurrentWallet(const QString& name)
  {
      if(!walletFrame)
          return false;
      return walletFrame->setCurrentWallet(name);
  }
  
  void BitcoinGUI::removeAllWallets()
  {
      if(!walletFrame)
          return;
      setWalletActionsEnabled(false);
      walletFrame->removeAllWallets();
  }
  #endif // ENABLE_WALLET
  
  void BitcoinGUI::setWalletActionsEnabled(bool enabled)
  {
      overviewAction->setEnabled(enabled);
      sendCoinsAction->setEnabled(enabled);
      sendCoinsMenuAction->setEnabled(enabled);
      receiveCoinsAction->setEnabled(enabled);
      receiveCoinsMenuAction->setEnabled(enabled);
      historyAction->setEnabled(enabled);
      encryptWalletAction->setEnabled(enabled);
      backupWalletAction->setEnabled(enabled);
      changePassphraseAction->setEnabled(enabled);
      signMessageAction->setEnabled(enabled);
      verifyMessageAction->setEnabled(enabled);
      usedSendingAddressesAction->setEnabled(enabled);
      usedReceivingAddressesAction->setEnabled(enabled);
      openAction->setEnabled(enabled);
  }
  
  void BitcoinGUI::createTrayIcon(const NetworkStyle *networkStyle)
  {
  #ifndef Q_OS_MAC
      trayIcon = new QSystemTrayIcon(this);
      QString toolTip = tr("%1 client").arg(tr(PACKAGE_NAME)) + " " + networkStyle->getTitleAddText();
      trayIcon->setToolTip(toolTip);
      trayIcon->setIcon(networkStyle->getTrayAndWindowIcon());
      trayIcon->hide();
  #endif
  
      notificator = new Notificator(QApplication::applicationName(), trayIcon, this);
  }
  
  void BitcoinGUI::createTrayIconMenu()
  {
  #ifndef Q_OS_MAC
      // return if trayIcon is unset (only on non-Mac OSes)
      if (!trayIcon)
          return;
  
      trayIconMenu = new QMenu(this);
      trayIcon->setContextMenu(trayIconMenu);
  
      connect(trayIcon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)),
              this, SLOT(trayIconActivated(QSystemTrayIcon::ActivationReason)));
  #else
      // Note: On Mac, the dock icon is used to provide the tray's functionality.
      MacDockIconHandler *dockIconHandler = MacDockIconHandler::instance();
      dockIconHandler->setMainWindow((QMainWindow *)this);
      trayIconMenu = dockIconHandler->dockMenu();
  #endif
  
      // Configuration of the tray icon (or dock icon) icon menu
      trayIconMenu->addAction(toggleHideAction);
      trayIconMenu->addSeparator();
      trayIconMenu->addAction(sendCoinsMenuAction);
      trayIconMenu->addAction(receiveCoinsMenuAction);
      trayIconMenu->addSeparator();
      trayIconMenu->addAction(signMessageAction);
      trayIconMenu->addAction(verifyMessageAction);
      trayIconMenu->addSeparator();
      trayIconMenu->addAction(optionsAction);
      trayIconMenu->addAction(openRPCConsoleAction);
  #ifndef Q_OS_MAC // This is built-in on Mac
      trayIconMenu->addSeparator();
      trayIconMenu->addAction(quitAction);
  #endif
  }
  
  #ifndef Q_OS_MAC
  void BitcoinGUI::trayIconActivated(QSystemTrayIcon::ActivationReason reason)
  {
      if(reason == QSystemTrayIcon::Trigger)
      {
          // Click on system tray icon triggers show/hide of the main window
          toggleHidden();
      }
  }
  #endif
  
  void BitcoinGUI::optionsClicked()
  {
      if(!clientModel || !clientModel->getOptionsModel())
          return;
  
      OptionsDialog dlg(this, enableWallet);
      dlg.setModel(clientModel->getOptionsModel());
      dlg.exec();
  }
  
  void BitcoinGUI::aboutClicked()
  {
      if(!clientModel)
          return;
  
      HelpMessageDialog dlg(this, true);
      dlg.exec();
  }
  
  void BitcoinGUI::showDebugWindow()
  {
      rpcConsole->showNormal();
      rpcConsole->show();
      rpcConsole->raise();
      rpcConsole->activateWindow();
  }
  
  void BitcoinGUI::showDebugWindowActivateConsole()
  {
      rpcConsole->setTabFocus(RPCConsole::TAB_CONSOLE);
      showDebugWindow();
  }
  
  void BitcoinGUI::showHelpMessageClicked()
  {
      helpMessageDialog->show();
  }
  
  #ifdef ENABLE_WALLET
  void BitcoinGUI::openClicked()
  {
      OpenURIDialog dlg(this);
      if(dlg.exec())
      {
          Q_EMIT receivedURI(dlg.getURI());
      }
  }
  
  void BitcoinGUI::gotoOverviewPage()
  {
      overviewAction->setChecked(true);
      if (walletFrame) walletFrame->gotoOverviewPage();
  }
  
  void BitcoinGUI::gotoHistoryPage()
  {
      historyAction->setChecked(true);
      if (walletFrame) walletFrame->gotoHistoryPage();
  }
  
  void BitcoinGUI::gotoReceiveCoinsPage()
  {
      receiveCoinsAction->setChecked(true);
      if (walletFrame) walletFrame->gotoReceiveCoinsPage();
  }
  
  void BitcoinGUI::gotoSendCoinsPage(QString addr)
  {
      sendCoinsAction->setChecked(true);
      if (walletFrame) walletFrame->gotoSendCoinsPage(addr);
  }
  
  void BitcoinGUI::gotoSignMessageTab(QString addr)
  {
      if (walletFrame) walletFrame->gotoSignMessageTab(addr);
  }
  
  void BitcoinGUI::gotoVerifyMessageTab(QString addr)
  {
      if (walletFrame) walletFrame->gotoVerifyMessageTab(addr);
  }
  #endif // ENABLE_WALLET
  
  void BitcoinGUI::updateNetworkState()
  {
      int count = clientModel->getNumConnections();
      QString icon;
      switch(count)
      {
      case 0: icon = ":/icons/connect_0"; break;
      case 1: case 2: case 3: icon = ":/icons/connect_1"; break;
      case 4: case 5: case 6: icon = ":/icons/connect_2"; break;
      case 7: case 8: case 9: icon = ":/icons/connect_3"; break;
      default: icon = ":/icons/connect_4"; break;
      }
  
      QString tooltip;
  
      if (clientModel->getNetworkActive()) {
          tooltip = tr("%n active connection(s) to Bintancoin network", "", count) + QString(".<br>") + tr("Click to disable network activity.");
      } else {
          tooltip = tr("Network activity disabled.") + QString("<br>") + tr("Click to enable network activity again.");
          icon = ":/icons/network_disabled";
      }
  
      // Don't word-wrap this (fixed-width) tooltip
      tooltip = QString("<nobr>") + tooltip + QString("</nobr>");
      connectionsControl->setToolTip(tooltip);
  
      connectionsControl->setPixmap(platformStyle->SingleColorIcon(icon).pixmap(STATUSBAR_ICONSIZE,STATUSBAR_ICONSIZE));
  }
  
  void BitcoinGUI::setNumConnections(int count)
  {
      updateNetworkState();
  }
  
  void BitcoinGUI::setNetworkActive(bool networkActive)
  {
      updateNetworkState();
  }
  
  void BitcoinGUI::updateHeadersSyncProgressLabel()
  {
      int64_t headersTipTime = clientModel->getHeaderTipTime();
      int headersTipHeight = clientModel->getHeaderTipHeight();
      int estHeadersLeft = (GetTime() - headersTipTime) / Params().GetConsensus().nPowTargetSpacing;
      if (estHeadersLeft > HEADER_HEIGHT_DELTA_SYNC)
          progressBarLabel->setText(tr("Syncing Headers (%1%)...").arg(QString::number(100.0 / (headersTipHeight+estHeadersLeft)*headersTipHeight, 'f', 1)));
  }
  
  void BitcoinGUI::setNumBlocks(int count, const QDateTime& blockDate, double nVerificationProgress, bool header)
  {
      if (modalOverlay)
      {
          if (header)
              modalOverlay->setKnownBestHeight(count, blockDate);
          else
              modalOverlay->tipUpdate(count, blockDate, nVerificationProgress);
      }
      if (!clientModel)
          return;
  
      // Prevent orphan statusbar messages (e.g. hover Quit in main menu, wait until chain-sync starts -> garbled text)
      statusBar()->clearMessage();
  
      // Acquire current block source
      enum BlockSource blockSource = clientModel->getBlockSource();
      switch (blockSource) {
          case BLOCK_SOURCE_NETWORK:
              if (header) {
                  updateHeadersSyncProgressLabel();
                  return;
              }
              progressBarLabel->setText(tr("Synchronizing with network..."));
              updateHeadersSyncProgressLabel();
              break;
          case BLOCK_SOURCE_DISK:
              if (header) {
                  progressBarLabel->setText(tr("Indexing blocks on disk..."));
              } else {
                  progressBarLabel->setText(tr("Processing blocks on disk..."));
              }
              break;
          case BLOCK_SOURCE_REINDEX:
              progressBarLabel->setText(tr("Reindexing blocks on disk..."));
              break;
          case BLOCK_SOURCE_NONE:
              if (header) {
                  return;
              }
              progressBarLabel->setText(tr("Connecting to peers..."));
              break;
      }
  
      QString tooltip;
  
      QDateTime currentDate = QDateTime::currentDateTime();
      qint64 secs = blockDate.secsTo(currentDate);
  
      tooltip = tr("Processed %n block(s) of transaction history.", "", count);
  
      // Set icon state: spinning if catching up, tick otherwise
      if(secs < 90*60)
      {
          tooltip = tr("Up to date") + QString(".<br>") + tooltip;
          labelBlocksIcon->setPixmap(platformStyle->SingleColorIcon(":/icons/synced").pixmap(STATUSBAR_ICONSIZE, STATUSBAR_ICONSIZE));
  
  #ifdef ENABLE_WALLET
          if(walletFrame)
          {
              walletFrame->showOutOfSyncWarning(false);
              modalOverlay->showHide(true, true);
          }
  #endif // ENABLE_WALLET
  
          progressBarLabel->setVisible(false);
          progressBar->setVisible(false);
      }
      else
      {
          QString timeBehindText = GUIUtil::formatNiceTimeOffset(secs);
  
          progressBarLabel->setVisible(true);
          progressBar->setFormat(tr("%1 behind").arg(timeBehindText));
          progressBar->setMaximum(1000000000);
          progressBar->setValue(nVerificationProgress * 1000000000.0 + 0.5);
          progressBar->setVisible(true);
  
          tooltip = tr("Catching up...") + QString("<br>") + tooltip;
          if(count != prevBlocks)
          {
              labelBlocksIcon->setPixmap(platformStyle->SingleColorIcon(QString(
                  ":/movies/spinner-%1").arg(spinnerFrame, 3, 10, QChar('0')))
                  .pixmap(STATUSBAR_ICONSIZE, STATUSBAR_ICONSIZE));
              spinnerFrame = (spinnerFrame + 1) % SPINNER_FRAMES;
          }
          prevBlocks = count;
  
  #ifdef ENABLE_WALLET
          if(walletFrame)
          {
              walletFrame->showOutOfSyncWarning(true);
              modalOverlay->showHide();
          }
  #endif // ENABLE_WALLET
  
          tooltip += QString("<br>");
          tooltip += tr("Last received block was generated %1 ago.").arg(timeBehindText);
          tooltip += QString("<br>");
          tooltip += tr("Transactions after this will not yet be visible.");
      }
  
      // Don't word-wrap this (fixed-width) tooltip
      tooltip = QString("<nobr>") + tooltip + QString("</nobr>");
  
      labelBlocksIcon->setToolTip(tooltip);
      progressBarLabel->setToolTip(tooltip);
      progressBar->setToolTip(tooltip);
  }
  
  void BitcoinGUI::message(const QString &title, const QString &message, unsigned int style, bool *ret)
  {
      QString strTitle = tr("Bintancoin"); // default title
      // Default to information icon
      int nMBoxIcon = QMessageBox::Information;
      int nNotifyIcon = Notificator::Information;
  
      QString msgType;
  
      // Prefer supplied title over style based title
      if (!title.isEmpty()) {
          msgType = title;
      }
      else {
          switch (style) {
          case CClientUIInterface::MSG_ERROR:
              msgType = tr("Error");
              break;
          case CClientUIInterface::MSG_WARNING:
              msgType = tr("Warning");
              break;
          case CClientUIInterface::MSG_INFORMATION:
              msgType = tr("Information");
              break;
          default:
              break;
          }
      }
      // Append title to "Bitcoin - "
      if (!msgType.isEmpty())
          strTitle += " - " + msgType;
  
      // Check for error/warning icon
      if (style & CClientUIInterface::ICON_ERROR) {
          nMBoxIcon = QMessageBox::Critical;
          nNotifyIcon = Notificator::Critical;
      }
      else if (style & CClientUIInterface::ICON_WARNING) {
          nMBoxIcon = QMessageBox::Warning;
          nNotifyIcon = Notificator::Warning;
      }
  
      // Display message
      if (style & CClientUIInterface::MODAL) {
          // Check for buttons, use OK as default, if none was supplied
          QMessageBox::StandardButton buttons;
          if (!(buttons = (QMessageBox::StandardButton)(style & CClientUIInterface::BTN_MASK)))
              buttons = QMessageBox::Ok;
  
          showNormalIfMinimized();
          QMessageBox mBox((QMessageBox::Icon)nMBoxIcon, strTitle, message, buttons, this);
          mBox.setTextFormat(Qt::PlainText);
          int r = mBox.exec();
          if (ret != nullptr)
              *ret = r == QMessageBox::Ok;
      }
      else
          notificator->notify((Notificator::Class)nNotifyIcon, strTitle, message);
  }
  
  void BitcoinGUI::changeEvent(QEvent *e)
  {
      QMainWindow::changeEvent(e);
  #ifndef Q_OS_MAC // Ignored on Mac
      if(e->type() == QEvent::WindowStateChange)
      {
          if(clientModel && clientModel->getOptionsModel() && clientModel->getOptionsModel()->getMinimizeToTray())
          {
              QWindowStateChangeEvent *wsevt = static_cast<QWindowStateChangeEvent*>(e);
              if(!(wsevt->oldState() & Qt::WindowMinimized) && isMinimized())
              {
                  QTimer::singleShot(0, this, SLOT(hide()));
                  e->ignore();
              }
              else if((wsevt->oldState() & Qt::WindowMinimized) && !isMinimized())
              {
                  QTimer::singleShot(0, this, SLOT(show()));
                  e->ignore();
              }
          }
      }
  #endif
  }
  
  void BitcoinGUI::closeEvent(QCloseEvent *event)
  {
  #ifndef Q_OS_MAC // Ignored on Mac
      if(clientModel && clientModel->getOptionsModel())
      {
          if(!clientModel->getOptionsModel()->getMinimizeOnClose())
          {
              // close rpcConsole in case it was open to make some space for the shutdown window
              rpcConsole->close();
  
              QApplication::quit();
          }
          else
          {
              QMainWindow::showMinimized();
              event->ignore();
          }
      }
  #else
      QMainWindow::closeEvent(event);
  #endif
  }
  
  void BitcoinGUI::showEvent(QShowEvent *event)
  {
      // enable the debug window when the main window shows up
      openRPCConsoleAction->setEnabled(true);
      aboutAction->setEnabled(true);
      optionsAction->setEnabled(true);
  }
  
  #ifdef ENABLE_WALLET
  void BitcoinGUI::incomingTransaction(const QString& date, int unit, const CAmount& amount, const QString& type, const QString& address, const QString& label)
  {
      // On new transaction, make an info balloon
      QString msg = tr("Date: %1\n").arg(date) +
                    tr("Amount: %1\n").arg(BitcoinUnits::formatWithUnit(unit, amount, true)) +
                    tr("Type: %1\n").arg(type);
      if (!label.isEmpty())
          msg += tr("Label: %1\n").arg(label);
      else if (!address.isEmpty())
          msg += tr("Address: %1\n").arg(address);
      message((amount)<0 ? tr("Sent transaction") : tr("Incoming transaction"),
               msg, CClientUIInterface::MSG_INFORMATION);
  }
  #endif // ENABLE_WALLET
  
  void BitcoinGUI::dragEnterEvent(QDragEnterEvent *event)
  {
      // Accept only URIs
      if(event->mimeData()->hasUrls())
          event->acceptProposedAction();
  }
  
  void BitcoinGUI::dropEvent(QDropEvent *event)
  {
      if(event->mimeData()->hasUrls())
      {
          for (const QUrl &uri : event->mimeData()->urls())
          {
              Q_EMIT receivedURI(uri.toString());
          }
      }
      event->acceptProposedAction();
  }
  
  bool BitcoinGUI::eventFilter(QObject *object, QEvent *event)
  {
      // Catch status tip events
      if (event->type() == QEvent::StatusTip)
      {
          // Prevent adding text from setStatusTip(), if we currently use the status bar for displaying other stuff
          if (progressBarLabel->isVisible() || progressBar->isVisible())
              return true;
      }
      return QMainWindow::eventFilter(object, event);
  }
  
  #ifdef ENABLE_WALLET
  bool BitcoinGUI::handlePaymentRequest(const SendCoinsRecipient& recipient)
  {
      // URI has to be valid
      if (walletFrame && walletFrame->handlePaymentRequest(recipient))
      {
          showNormalIfMinimized();
          gotoSendCoinsPage();
          return true;
      }
      return false;
  }
  
  void BitcoinGUI::setHDStatus(int hdEnabled)
  {
      labelWalletHDStatusIcon->setPixmap(platformStyle->SingleColorIcon(hdEnabled ? ":/icons/hd_enabled" : ":/icons/hd_disabled").pixmap(STATUSBAR_ICONSIZE,STATUSBAR_ICONSIZE));
      labelWalletHDStatusIcon->setToolTip(hdEnabled ? tr("HD key generation is <b>enabled</b>") : tr("HD key generation is <b>disabled</b>"));
  
      // eventually disable the QLabel to set its opacity to 50% 
      labelWalletHDStatusIcon->setEnabled(hdEnabled);
  }
  
  void BitcoinGUI::setEncryptionStatus(int status)
  {
      switch(status)
      {
      case WalletModel::Unencrypted:
          labelWalletEncryptionIcon->hide();
          encryptWalletAction->setChecked(false);
          changePassphraseAction->setEnabled(false);
          encryptWalletAction->setEnabled(true);
          break;
      case WalletModel::Unlocked:
          labelWalletEncryptionIcon->show();
          labelWalletEncryptionIcon->setPixmap(platformStyle->SingleColorIcon(":/icons/lock_open").pixmap(STATUSBAR_ICONSIZE,STATUSBAR_ICONSIZE));
          labelWalletEncryptionIcon->setToolTip(tr("Wallet is <b>encrypted</b> and currently <b>unlocked</b>"));
          encryptWalletAction->setChecked(true);
          changePassphraseAction->setEnabled(true);
          encryptWalletAction->setEnabled(false); // TODO: decrypt currently not supported
          break;
      case WalletModel::Locked:
          labelWalletEncryptionIcon->show();
          labelWalletEncryptionIcon->setPixmap(platformStyle->SingleColorIcon(":/icons/lock_closed").pixmap(STATUSBAR_ICONSIZE,STATUSBAR_ICONSIZE));
          labelWalletEncryptionIcon->setToolTip(tr("Wallet is <b>encrypted</b> and currently <b>locked</b>"));
          encryptWalletAction->setChecked(true);
          changePassphraseAction->setEnabled(true);
          encryptWalletAction->setEnabled(false); // TODO: decrypt currently not supported
          break;
      }
  }
  #endif // ENABLE_WALLET
  
  void BitcoinGUI::showNormalIfMinimized(bool fToggleHidden)
  {
      if(!clientModel)
          return;
  
      // activateWindow() (sometimes) helps with keyboard focus on Windows
      if (isHidden())
      {
          show();
          activateWindow();
      }
      else if (isMinimized())
      {
          showNormal();
          activateWindow();
      }
      else if (GUIUtil::isObscured(this))
      {
          raise();
          activateWindow();
      }
      else if(fToggleHidden)
          hide();
  }
  
  void BitcoinGUI::toggleHidden()
  {
      showNormalIfMinimized(true);
  }
  
  void BitcoinGUI::detectShutdown()
  {
      if (ShutdownRequested())
      {
          if(rpcConsole)
              rpcConsole->hide();
          qApp->quit();
      }
  }
  
  void BitcoinGUI::showProgress(const QString &title, int nProgress)
  {
      if (nProgress == 0)
      {
          progressDialog = new QProgressDialog(title, "", 0, 100);
          progressDialog->setWindowModality(Qt::ApplicationModal);
          progressDialog->setMinimumDuration(0);
          progressDialog->setCancelButton(0);
          progressDialog->setAutoClose(false);
          progressDialog->setValue(0);
      }
      else if (nProgress == 100)
      {
          if (progressDialog)
          {
              progressDialog->close();
              progressDialog->deleteLater();
          }
      }
      else if (progressDialog)
          progressDialog->setValue(nProgress);
  }
  
  void BitcoinGUI::setTrayIconVisible(bool fHideTrayIcon)
  {
      if (trayIcon)
      {
          trayIcon->setVisible(!fHideTrayIcon);
      }
  }
  
  void BitcoinGUI::showModalOverlay()
  {
      if (modalOverlay && (progressBar->isVisible() || modalOverlay->isLayerVisible()))
          modalOverlay->toggleVisibility();
  }
  
  static bool ThreadSafeMessageBox(BitcoinGUI *gui, const std::string& message, const std::string& caption, unsigned int style)
  {
      bool modal = (style & CClientUIInterface::MODAL);
      // The SECURE flag has no effect in the Qt GUI.
      // bool secure = (style & CClientUIInterface::SECURE);
      style &= ~CClientUIInterface::SECURE;
      bool ret = false;
      // In case of modal message, use blocking connection to wait for user to click a button
      QMetaObject::invokeMethod(gui, "message",
                                 modal ? GUIUtil::blockingGUIThreadConnection() : Qt::QueuedConnection,
                                 Q_ARG(QString, QString::fromStdString(caption)),
                                 Q_ARG(QString, QString::fromStdString(message)),
                                 Q_ARG(unsigned int, style),
                                 Q_ARG(bool*, &ret));
      return ret;
  }
  
  void BitcoinGUI::subscribeToCoreSignals()
  {
      // Connect signals to client
      uiInterface.ThreadSafeMessageBox.connect(boost::bind(ThreadSafeMessageBox, this, _1, _2, _3));
      uiInterface.ThreadSafeQuestion.connect(boost::bind(ThreadSafeMessageBox, this, _1, _3, _4));
  }
  
  void BitcoinGUI::unsubscribeFromCoreSignals()
  {
      // Disconnect signals from client
      uiInterface.ThreadSafeMessageBox.disconnect(boost::bind(ThreadSafeMessageBox, this, _1, _2, _3));
      uiInterface.ThreadSafeQuestion.disconnect(boost::bind(ThreadSafeMessageBox, this, _1, _3, _4));
  }
  
  void BitcoinGUI::toggleNetworkActive()
  {
      if (clientModel) {
          clientModel->setNetworkActive(!clientModel->getNetworkActive());
      }
  }
  
  UnitDisplayStatusBarControl::UnitDisplayStatusBarControl(const PlatformStyle *platformStyle) :
      optionsModel(0),
      menu(0)
  {
      createContextMenu();
      setToolTip(tr("Unit to show amounts in. Click to select another unit."));
      QList<BitcoinUnits::Unit> units = BitcoinUnits::availableUnits();
      int max_width = 0;
      const QFontMetrics fm(font());
      for (const BitcoinUnits::Unit unit : units)
      {
          max_width = qMax(max_width, fm.width(BitcoinUnits::longName(unit)));
      }
      setMinimumSize(max_width, 0);
      setAlignment(Qt::AlignRight | Qt::AlignVCenter);
      setStyleSheet(QString("QLabel { color : %1 }").arg(platformStyle->SingleColor().name()));
  }
  
  /** So that it responds to button clicks */
  void UnitDisplayStatusBarControl::mousePressEvent(QMouseEvent *event)
  {
      onDisplayUnitsClicked(event->pos());
  }
  
  /** Creates context menu, its actions, and wires up all the relevant signals for mouse events. */
  void UnitDisplayStatusBarControl::createContextMenu()
  {
      menu = new QMenu(this);
      for (BitcoinUnits::Unit u : BitcoinUnits::availableUnits())
      {
          QAction *menuAction = new QAction(QString(BitcoinUnits::longName(u)), this);
          menuAction->setData(QVariant(u));
          menu->addAction(menuAction);
      }
      connect(menu,SIGNAL(triggered(QAction*)),this,SLOT(onMenuSelection(QAction*)));
  }
  
  /** Lets the control know about the Options Model (and its signals) */
  void UnitDisplayStatusBarControl::setOptionsModel(OptionsModel *_optionsModel)
  {
      if (_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)));
  
          // initialize the display units label with the current value in the model.
          updateDisplayUnit(_optionsModel->getDisplayUnit());
      }
  }
  
  /** When Display Units are changed on OptionsModel it will refresh the display text of the control on the status bar */
  void UnitDisplayStatusBarControl::updateDisplayUnit(int newUnits)
  {
      setText(BitcoinUnits::longName(newUnits));
  }
  
  /** Shows context menu with Display Unit options by the mouse coordinates */
  void UnitDisplayStatusBarControl::onDisplayUnitsClicked(const QPoint& point)
  {
      QPoint globalPos = mapToGlobal(point);
      menu->exec(globalPos);
  }
  
  /** Tells underlying optionsModel to update its current display unit. */
  void UnitDisplayStatusBarControl::onMenuSelection(QAction* action)
  {
      if (action)
      {
          optionsModel->setDisplayUnit(action->data());
      }
  }
  