text: #!/usr/bin/env python
  #
  # Electrum - lightweight Bitcoin client
  # Copyright (C) 2012 thomasv@gitorious
  #
  # Permission is hereby granted, free of charge, to any person
  # obtaining a copy of this software and associated documentation files
  # (the "Software"), to deal in the Software without restriction,
  # including without limitation the rights to use, copy, modify, merge,
  # publish, distribute, sublicense, and/or sell copies of the Software,
  # and to permit persons to whom the Software is furnished to do so,
  # subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be
  # included in all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  # BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  # ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
  import sys, time, threading
  import os, json, traceback
  import shutil
  import weakref
  import webbrowser
  import csv
  from decimal import Decimal
  import base64
  from functools import partial
  
  from PyQt5.QtGui import *
  from PyQt5.QtCore import *
  import PyQt5.QtCore as QtCore
  
  from .exception_window import Exception_Hook
  from PyQt5.QtWidgets import *
  
  from electrum import (keystore, simple_config, ecc, constants, util, bitcoin, commands,
                        coinchooser, paymentrequest)
  from electrum.bitcoin import COIN, is_address, TYPE_ADDRESS
  from electrum.plugin import run_hook
  from electrum.i18n import _
  from electrum.util import (format_time, format_satoshis, format_fee_satoshis,
                             format_satoshis_plain, NotEnoughFunds, PrintError,
                             UserCancelled, NoDynamicFeeEstimates, profiler,
                             export_meta, import_meta, bh2u, bfh, InvalidPassword,
                             base_units, base_units_list, base_unit_name_to_decimal_point,
                             decimal_point_to_base_unit_name, quantize_feerate)
  from electrum.transaction import Transaction, TxOutput
  from electrum.address_synchronizer import AddTransactionException
  from electrum.wallet import Multisig_Wallet, CannotBumpFee
  
  from .amountedit import AmountEdit, BTCAmountEdit, MyLineEdit, FeerateEdit
  from .qrcodewidget import QRCodeWidget, QRDialog
  from .qrtextedit import ShowQRTextEdit, ScanQRTextEdit
  from .transaction_dialog import show_transaction
  from .fee_slider import FeeSlider
  from .util import *
  from .installwizard import WIF_HELP_TEXT
  
  
  class StatusBarButton(QPushButton):
      def __init__(self, icon, tooltip, func):
          QPushButton.__init__(self, icon, '')
          self.setToolTip(tooltip)
          self.setFlat(True)
          self.setMaximumWidth(25)
          self.clicked.connect(self.onPress)
          self.func = func
          self.setIconSize(QSize(25,25))
  
      def onPress(self, checked=False):
          '''Drops the unwanted PyQt5 "checked" argument'''
          self.func()
  
      def keyPressEvent(self, e):
          if e.key() == Qt.Key_Return:
              self.func()
  
  
  from electrum.paymentrequest import PR_PAID
  
  
  class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
  
      payment_request_ok_signal = pyqtSignal()
      payment_request_error_signal = pyqtSignal()
      notify_transactions_signal = pyqtSignal()
      new_fx_quotes_signal = pyqtSignal()
      new_fx_history_signal = pyqtSignal()
      network_signal = pyqtSignal(str, object)
      alias_received_signal = pyqtSignal()
      computing_privkeys_signal = pyqtSignal()
      show_privkeys_signal = pyqtSignal()
  
      def __init__(self, gui_object, wallet):
          QMainWindow.__init__(self)
  
          self.gui_object = gui_object
          self.config = config = gui_object.config
  
          self.setup_exception_hook()
  
          self.network = gui_object.daemon.network
          self.fx = gui_object.daemon.fx
          self.invoices = wallet.invoices
          self.contacts = wallet.contacts
          self.tray = gui_object.tray
          self.app = gui_object.app
          self.cleaned_up = False
          self.is_max = False
          self.payment_request = None
          self.checking_accounts = False
          self.qr_window = None
          self.not_enough_funds = False
          self.pluginsdialog = None
          self.require_fee_update = False
          self.tx_notifications = []
          self.tl_windows = []
          self.tx_external_keypairs = {}
  
          self.create_status_bar()
          self.need_update = threading.Event()
  
          self.decimal_point = config.get('decimal_point', 8)
          self.num_zeros     = int(config.get('num_zeros',0))
  
          self.completions = QStringListModel()
  
          self.tabs = tabs = QTabWidget(self)
          self.send_tab = self.create_send_tab()
          self.receive_tab = self.create_receive_tab()
          self.addresses_tab = self.create_addresses_tab()
          self.utxo_tab = self.create_utxo_tab()
          self.console_tab = self.create_console_tab()
          self.contacts_tab = self.create_contacts_tab()
          tabs.addTab(self.create_history_tab(), QIcon(":icons/tab_history.png"), _('History'))
          tabs.addTab(self.send_tab, QIcon(":icons/tab_send.png"), _('Send'))
          tabs.addTab(self.receive_tab, QIcon(":icons/tab_receive.png"), _('Receive'))
  
          def add_optional_tab(tabs, tab, icon, description, name):
              tab.tab_icon = icon
              tab.tab_description = description
              tab.tab_pos = len(tabs)
              tab.tab_name = name
              if self.config.get('show_{}_tab'.format(name), False):
                  tabs.addTab(tab, icon, description.replace("&", ""))
  
          add_optional_tab(tabs, self.addresses_tab, QIcon(":icons/tab_addresses.png"), _("&Addresses"), "addresses")
          add_optional_tab(tabs, self.utxo_tab, QIcon(":icons/tab_coins.png"), _("Co&ins"), "utxo")
          add_optional_tab(tabs, self.contacts_tab, QIcon(":icons/tab_contacts.png"), _("Con&tacts"), "contacts")
          add_optional_tab(tabs, self.console_tab, QIcon(":icons/tab_console.png"), _("Con&sole"), "console")
  
          tabs.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
          self.setCentralWidget(tabs)
  
          if self.config.get("is_maximized"):
              self.showMaximized()
  
          self.setWindowIcon(QIcon(":icons/electrum.png"))
          self.init_menubar()
  
          wrtabs = weakref.proxy(tabs)
          QShortcut(QKeySequence("Ctrl+W"), self, self.close)
          QShortcut(QKeySequence("Ctrl+Q"), self, self.close)
          QShortcut(QKeySequence("Ctrl+R"), self, self.update_wallet)
          QShortcut(QKeySequence("Ctrl+PgUp"), self, lambda: wrtabs.setCurrentIndex((wrtabs.currentIndex() - 1)%wrtabs.count()))
          QShortcut(QKeySequence("Ctrl+PgDown"), self, lambda: wrtabs.setCurrentIndex((wrtabs.currentIndex() + 1)%wrtabs.count()))
  
          for i in range(wrtabs.count()):
              QShortcut(QKeySequence("Alt+" + str(i + 1)), self, lambda i=i: wrtabs.setCurrentIndex(i))
  
          self.payment_request_ok_signal.connect(self.payment_request_ok)
          self.payment_request_error_signal.connect(self.payment_request_error)
          self.notify_transactions_signal.connect(self.notify_transactions)
          self.history_list.setFocus(True)
  
          # network callbacks
          if self.network:
              self.network_signal.connect(self.on_network_qt)
              interests = ['updated', 'new_transaction', 'status',
                           'banner', 'verified', 'fee']
              # To avoid leaking references to "self" that prevent the
              # window from being GC-ed when closed, callbacks should be
              # methods of this class only, and specifically not be
              # partials, lambdas or methods of subobjects.  Hence...
              self.network.register_callback(self.on_network, interests)
              # set initial message
              self.console.showMessage(self.network.banner)
              self.network.register_callback(self.on_quotes, ['on_quotes'])
              self.network.register_callback(self.on_history, ['on_history'])
              self.new_fx_quotes_signal.connect(self.on_fx_quotes)
              self.new_fx_history_signal.connect(self.on_fx_history)
  
          # update fee slider in case we missed the callback
          self.fee_slider.update()
          self.load_wallet(wallet)
          self.connect_slots(gui_object.timer)
          self.fetch_alias()
  
      def on_history(self, b):
          self.new_fx_history_signal.emit()
  
      def setup_exception_hook(self):
          Exception_Hook(self)
  
      def on_fx_history(self):
          self.history_list.refresh_headers()
          self.history_list.update()
          self.address_list.update()
  
      def on_quotes(self, b):
          self.new_fx_quotes_signal.emit()
  
      def on_fx_quotes(self):
          self.update_status()
          # Refresh edits with the new rate
          edit = self.fiat_send_e if self.fiat_send_e.is_last_edited else self.amount_e
          edit.textEdited.emit(edit.text())
          edit = self.fiat_receive_e if self.fiat_receive_e.is_last_edited else self.receive_amount_e
          edit.textEdited.emit(edit.text())
          # History tab needs updating if it used spot
          if self.fx.history_used_spot:
              self.history_list.update()
  
      def toggle_tab(self, tab):
          show = not self.config.get('show_{}_tab'.format(tab.tab_name), False)
          self.config.set_key('show_{}_tab'.format(tab.tab_name), show)
          item_text = (_("Hide") if show else _("Show")) + " " + tab.tab_description
          tab.menu_action.setText(item_text)
          if show:
              # Find out where to place the tab
              index = len(self.tabs)
              for i in range(len(self.tabs)):
                  try:
                      if tab.tab_pos < self.tabs.widget(i).tab_pos:
                          index = i
                          break
                  except AttributeError:
                      pass
              self.tabs.insertTab(index, tab, tab.tab_icon, tab.tab_description.replace("&", ""))
          else:
              i = self.tabs.indexOf(tab)
              self.tabs.removeTab(i)
  
      def push_top_level_window(self, window):
          '''Used for e.g. tx dialog box to ensure new dialogs are appropriately
          parented.  This used to be done by explicitly providing the parent
          window, but that isn't something hardware wallet prompts know.'''
          self.tl_windows.append(window)
  
      def pop_top_level_window(self, window):
          self.tl_windows.remove(window)
  
      def top_level_window(self, test_func=None):
          '''Do the right thing in the presence of tx dialog windows'''
          override = self.tl_windows[-1] if self.tl_windows else None
          if override and test_func and not test_func(override):
              override = None  # only override if ok for test_func
          return self.top_level_window_recurse(override, test_func)
  
      def diagnostic_name(self):
          return "%s/%s" % (PrintError.diagnostic_name(self),
                            self.wallet.basename() if self.wallet else "None")
  
      def is_hidden(self):
          return self.isMinimized() or self.isHidden()
  
      def show_or_hide(self):
          if self.is_hidden():
              self.bring_to_top()
          else:
              self.hide()
  
      def bring_to_top(self):
          self.show()
          self.raise_()
  
      def on_error(self, exc_info):
          if not isinstance(exc_info[1], UserCancelled):
              try:
                  traceback.print_exception(*exc_info)
              except OSError:
                  pass  # see #4418; try to at least show popup:
              self.show_error(str(exc_info[1]))
  
      def on_network(self, event, *args):
          if event == 'updated':
              self.need_update.set()
              self.gui_object.network_updated_signal_obj.network_updated_signal \
                  .emit(event, args)
          elif event == 'new_transaction':
              self.tx_notifications.append(args[0])
              self.notify_transactions_signal.emit()
          elif event in ['status', 'banner', 'verified', 'fee']:
              # Handle in GUI thread
              self.network_signal.emit(event, args)
          else:
              self.print_error("unexpected network message:", event, args)
  
      def on_network_qt(self, event, args=None):
          # Handle a network message in the GUI thread
          if event == 'status':
              self.update_status()
          elif event == 'banner':
              self.console.showMessage(args[0])
          elif event == 'verified':
              self.history_list.update_item(*args)
          elif event == 'fee':
              if self.config.is_dynfee():
                  self.fee_slider.update()
                  self.do_update_fee()
          elif event == 'fee_histogram':
              if self.config.is_dynfee():
                  self.fee_slider.update()
                  self.do_update_fee()
              # todo: update only unconfirmed tx
              self.history_list.update()
          else:
              self.print_error("unexpected network_qt signal:", event, args)
  
      def fetch_alias(self):
          self.alias_info = None
          alias = self.config.get('alias')
          if alias:
              alias = str(alias)
              def f():
                  self.alias_info = self.contacts.resolve_openalias(alias)
                  self.alias_received_signal.emit()
              t = threading.Thread(target=f)
              t.setDaemon(True)
              t.start()
  
      def close_wallet(self):
          if self.wallet:
              self.print_error('close_wallet', self.wallet.storage.path)
          run_hook('close_wallet', self.wallet)
  
      @profiler
      def load_wallet(self, wallet):
          wallet.thread = TaskThread(self, self.on_error)
          self.wallet = wallet
          self.update_recently_visited(wallet.storage.path)
          # address used to create a dummy transaction and estimate transaction fee
          self.history_list.update()
          self.address_list.update()
          self.utxo_list.update()
          self.need_update.set()
          # Once GUI has been initialized check if we want to announce something since the callback has been called before the GUI was initialized
          self.notify_transactions()
          # update menus
          self.seed_menu.setEnabled(self.wallet.has_seed())
          self.update_lock_icon()
          self.update_buttons_on_seed()
          self.update_console()
          self.clear_receive_tab()
          self.request_list.update()
          self.tabs.show()
          self.init_geometry()
          if self.config.get('hide_gui') and self.gui_object.tray.isVisible():
              self.hide()
          else:
              self.show()
          self.watching_only_changed()
          run_hook('load_wallet', wallet, self)
  
      def init_geometry(self):
          winpos = self.wallet.storage.get("winpos-qt")
          try:
              screen = self.app.desktop().screenGeometry()
              assert screen.contains(QRect(*winpos))
              self.setGeometry(*winpos)
          except:
              self.print_error("using default geometry")
              self.setGeometry(100, 100, 840, 400)
  
      def watching_only_changed(self):
          name = "Electrum Testnet" if constants.net.TESTNET else "Electrum"
          title = '%s %s  -  %s' % (name, self.wallet.electrum_version,
                                          self.wallet.basename())
          extra = [self.wallet.storage.get('wallet_type', '?')]
          if self.wallet.is_watching_only():
              self.warn_if_watching_only()
              extra.append(_('watching only'))
          title += '  [%s]'% ', '.join(extra)
          self.setWindowTitle(title)
          self.password_menu.setEnabled(self.wallet.may_have_password())
          self.import_privkey_menu.setVisible(self.wallet.can_import_privkey())
          self.import_address_menu.setVisible(self.wallet.can_import_address())
          self.export_menu.setEnabled(self.wallet.can_export())
  
      def warn_if_watching_only(self):
          if self.wallet.is_watching_only():
              msg = ' '.join([
                  _("This wallet is watching-only."),
                  _("This means you will not be able to spend Fujicoins with it."),
                  _("Make sure you own the seed phrase or the private keys, before you request Fujicoins to be sent to this wallet.")
              ])
              self.show_warning(msg, title=_('Information'))
  
      def open_wallet(self):
          try:
              wallet_folder = self.get_wallet_folder()
          except FileNotFoundError as e:
              self.show_error(str(e))
              return
          filename, __ = QFileDialog.getOpenFileName(self, "Select your wallet file", wallet_folder)
          if not filename:
              return
          self.gui_object.new_window(filename)
  
  
      def backup_wallet(self):
          path = self.wallet.storage.path
          wallet_folder = os.path.dirname(path)
          filename, __ = QFileDialog.getSaveFileName(self, _('Enter a filename for the copy of your wallet'), wallet_folder)
          if not filename:
              return
          new_path = os.path.join(wallet_folder, filename)
          if new_path != path:
              try:
                  shutil.copy2(path, new_path)
                  self.show_message(_("A copy of your wallet file was created in")+" '%s'" % str(new_path), title=_("Wallet backup created"))
              except BaseException as reason:
                  self.show_critical(_("Electrum was unable to copy your wallet file to the specified location.") + "\n" + str(reason), title=_("Unable to create backup"))
  
      def update_recently_visited(self, filename):
          recent = self.config.get('recently_open', [])
          try:
              sorted(recent)
          except:
              recent = []
          if filename in recent:
              recent.remove(filename)
          recent.insert(0, filename)
          recent = recent[:5]
          self.config.set_key('recently_open', recent)
          self.recently_visited_menu.clear()
          for i, k in enumerate(sorted(recent)):
              b = os.path.basename(k)
              def loader(k):
                  return lambda: self.gui_object.new_window(k)
              self.recently_visited_menu.addAction(b, loader(k)).setShortcut(QKeySequence("Ctrl+%d"%(i+1)))
          self.recently_visited_menu.setEnabled(len(recent))
  
      def get_wallet_folder(self):
          return os.path.dirname(os.path.abspath(self.config.get_wallet_path()))
  
      def new_wallet(self):
          try:
              wallet_folder = self.get_wallet_folder()
          except FileNotFoundError as e:
              self.show_error(str(e))
              return
          i = 1
          while True:
              filename = "wallet_%d" % i
              if filename in os.listdir(wallet_folder):
                  i += 1
              else:
                  break
          full_path = os.path.join(wallet_folder, filename)
          self.gui_object.start_new_window(full_path, None)
  
      def init_menubar(self):
          menubar = QMenuBar()
  
          file_menu = menubar.addMenu(_("&File"))
          self.recently_visited_menu = file_menu.addMenu(_("&Recently open"))
          file_menu.addAction(_("&Open"), self.open_wallet).setShortcut(QKeySequence.Open)
          file_menu.addAction(_("&New/Restore"), self.new_wallet).setShortcut(QKeySequence.New)
          file_menu.addAction(_("&Save Copy"), self.backup_wallet).setShortcut(QKeySequence.SaveAs)
          file_menu.addAction(_("Delete"), self.remove_wallet)
          file_menu.addSeparator()
          file_menu.addAction(_("&Quit"), self.close)
  
          wallet_menu = menubar.addMenu(_("&Wallet"))
          wallet_menu.addAction(_("&Information"), self.show_master_public_keys)
          wallet_menu.addSeparator()
          self.password_menu = wallet_menu.addAction(_("&Password"), self.change_password_dialog)
          self.seed_menu = wallet_menu.addAction(_("&Seed"), self.show_seed_dialog)
          self.private_keys_menu = wallet_menu.addMenu(_("&Private keys"))
          self.private_keys_menu.addAction(_("&Sweep"), self.sweep_key_dialog)
          self.import_privkey_menu = self.private_keys_menu.addAction(_("&Import"), self.do_import_privkey)
          self.export_menu = self.private_keys_menu.addAction(_("&Export"), self.export_privkeys_dialog)
          self.import_address_menu = wallet_menu.addAction(_("Import addresses"), self.import_addresses)
          wallet_menu.addSeparator()
  
          addresses_menu = wallet_menu.addMenu(_("&Addresses"))
          addresses_menu.addAction(_("&Filter"), lambda: self.address_list.toggle_toolbar(self.config))
          labels_menu = wallet_menu.addMenu(_("&Labels"))
          labels_menu.addAction(_("&Import"), self.do_import_labels)
          labels_menu.addAction(_("&Export"), self.do_export_labels)
          history_menu = wallet_menu.addMenu(_("&History"))
          history_menu.addAction(_("&Filter"), lambda: self.history_list.toggle_toolbar(self.config))
          history_menu.addAction(_("&Summary"), self.history_list.show_summary)
          history_menu.addAction(_("&Plot"), self.history_list.plot_history_dialog)
          history_menu.addAction(_("&Export"), self.history_list.export_history_dialog)
          contacts_menu = wallet_menu.addMenu(_("Contacts"))
          contacts_menu.addAction(_("&New"), self.new_contact_dialog)
          contacts_menu.addAction(_("Import"), lambda: self.contact_list.import_contacts())
          contacts_menu.addAction(_("Export"), lambda: self.contact_list.export_contacts())
          invoices_menu = wallet_menu.addMenu(_("Invoices"))
          invoices_menu.addAction(_("Import"), lambda: self.invoice_list.import_invoices())
          invoices_menu.addAction(_("Export"), lambda: self.invoice_list.export_invoices())
  
          wallet_menu.addSeparator()
          wallet_menu.addAction(_("Find"), self.toggle_search).setShortcut(QKeySequence("Ctrl+F"))
  
          def add_toggle_action(view_menu, tab):
              is_shown = self.config.get('show_{}_tab'.format(tab.tab_name), False)
              item_name = (_("Hide") if is_shown else _("Show")) + " " + tab.tab_description
              tab.menu_action = view_menu.addAction(item_name, lambda: self.toggle_tab(tab))
  
          view_menu = menubar.addMenu(_("&View"))
          add_toggle_action(view_menu, self.addresses_tab)
          add_toggle_action(view_menu, self.utxo_tab)
          add_toggle_action(view_menu, self.contacts_tab)
          add_toggle_action(view_menu, self.console_tab)
  
          tools_menu = menubar.addMenu(_("&Tools"))
  
          # Settings / Preferences are all reserved keywords in macOS using this as work around
          tools_menu.addAction(_("Electrum preferences") if sys.platform == 'darwin' else _("Preferences"), self.settings_dialog)
          tools_menu.addAction(_("&Network"), lambda: self.gui_object.show_network_dialog(self))
          tools_menu.addAction(_("&Plugins"), self.plugins_dialog)
          tools_menu.addSeparator()
          tools_menu.addAction(_("&Sign/verify message"), self.sign_verify_message)
          tools_menu.addAction(_("&Encrypt/decrypt message"), self.encrypt_message)
          tools_menu.addSeparator()
  
          paytomany_menu = tools_menu.addAction(_("&Pay to many"), self.paytomany)
  
          raw_transaction_menu = tools_menu.addMenu(_("&Load transaction"))
          raw_transaction_menu.addAction(_("&From file"), self.do_process_from_file)
          raw_transaction_menu.addAction(_("&From text"), self.do_process_from_text)
          raw_transaction_menu.addAction(_("&From the blockchain"), self.do_process_from_txid)
          raw_transaction_menu.addAction(_("&From QR code"), self.read_tx_from_qrcode)
          self.raw_transaction_menu = raw_transaction_menu
          run_hook('init_menubar_tools', self, tools_menu)
  
          help_menu = menubar.addMenu(_("&Help"))
          help_menu.addAction(_("&About"), self.show_about)
          help_menu.addAction(_("&Official website"), lambda: webbrowser.open("http://www.fujicoin.org"))
          help_menu.addSeparator()
          help_menu.addAction(_("&Documentation"), lambda: webbrowser.open("http://docs.electrum.org/")).setShortcut(QKeySequence.HelpContents)
          help_menu.addAction(_("&Report Bug"), self.show_report_bug)
          help_menu.addSeparator()
          help_menu.addAction(_("&Donate to server"), self.donate_to_server)
  
          self.setMenuBar(menubar)
  
      def donate_to_server(self):
          d = self.network.get_donation_address()
          if d:
              host = self.network.get_parameters()[0]
              self.pay_to_URI('fujicoin:%s?message=donation for %s'%(d, host))
          else:
              self.show_error(_('No donation address for this server'))
  
      def show_about(self):
          QMessageBox.about(self, "Electrum",
                            (_("Version")+" %s" % self.wallet.electrum_version + "\n\n" +
                             _("Electrum's focus is speed, with low resource usage and simplifying Fujicoin.") + " " +
                             _("You do not need to perform regular backups, because your wallet can be "
                                "recovered from a secret phrase that you can memorize or write on paper.") + " " +
                             _("Startup times are instant because it operates in conjunction with high-performance "
                                "servers that handle the most complicated parts of the Fujicoin system.") + "\n\n" +
                             _("Uses icons from the Icons8 icon pack (icons8.com).")))
  
      def show_report_bug(self):
          msg = ' '.join([
              _("Please report any bugs as issues on github:<br/>"),
              "<a href=\"https://github.com/spesmilo/electrum/issues\">https://github.com/spesmilo/electrum/issues</a><br/><br/>",
              _("Before reporting a bug, upgrade to the most recent version of Electrum (latest release or git HEAD), and include the version number in your report."),
              _("Try to explain not only what the bug is, but how it occurs.")
           ])
          self.show_message(msg, title="Electrum - " + _("Reporting Bugs"))
  
      def notify_transactions(self):
          if not self.network or not self.network.is_connected():
              return
          self.print_error("Notifying GUI")
          if len(self.tx_notifications) > 0:
              # Combine the transactions if there are at least three
              num_txns = len(self.tx_notifications)
              if num_txns >= 3:
                  total_amount = 0
                  for tx in self.tx_notifications:
                      is_relevant, is_mine, v, fee = self.wallet.get_wallet_delta(tx)
                      if v > 0:
                          total_amount += v
                  self.notify(_("{} new transactions received: Total amount received in the new transactions {}")
                              .format(num_txns, self.format_amount_and_units(total_amount)))
                  self.tx_notifications = []
              else:
                  for tx in self.tx_notifications:
                      if tx:
                          self.tx_notifications.remove(tx)
                          is_relevant, is_mine, v, fee = self.wallet.get_wallet_delta(tx)
                          if v > 0:
                              self.notify(_("New transaction received: {}").format(self.format_amount_and_units(v)))
  
      def notify(self, message):
          if self.tray:
              try:
                  # this requires Qt 5.9
                  self.tray.showMessage("Electrum", message, QIcon(":icons/electrum_dark_icon"), 20000)
              except TypeError:
                  self.tray.showMessage("Electrum", message, QSystemTrayIcon.Information, 20000)
  
  
  
      # custom wrappers for getOpenFileName and getSaveFileName, that remember the path selected by the user
      def getOpenFileName(self, title, filter = ""):
          directory = self.config.get('io_dir', os.path.expanduser('~'))
          fileName, __ = QFileDialog.getOpenFileName(self, title, directory, filter)
          if fileName and directory != os.path.dirname(fileName):
              self.config.set_key('io_dir', os.path.dirname(fileName), True)
          return fileName
  
      def getSaveFileName(self, title, filename, filter = ""):
          directory = self.config.get('io_dir', os.path.expanduser('~'))
          path = os.path.join( directory, filename )
          fileName, __ = QFileDialog.getSaveFileName(self, title, path, filter)
          if fileName and directory != os.path.dirname(fileName):
              self.config.set_key('io_dir', os.path.dirname(fileName), True)
          return fileName
  
      def connect_slots(self, sender):
          sender.timer_signal.connect(self.timer_actions)
  
      def timer_actions(self):
          # Note this runs in the GUI thread
          if self.need_update.is_set():
              self.need_update.clear()
              self.update_wallet()
          # resolve aliases
          # FIXME this is a blocking network call that has a timeout of 5 sec
          self.payto_e.resolve()
          # update fee
          if self.require_fee_update:
              self.do_update_fee()
              self.require_fee_update = False
  
      def format_amount(self, x, is_diff=False, whitespaces=False):
          return format_satoshis(x, self.num_zeros, self.decimal_point, is_diff=is_diff, whitespaces=whitespaces)
  
      def format_amount_and_units(self, amount):
          text = self.format_amount(amount) + ' '+ self.base_unit()
          x = self.fx.format_amount_and_units(amount) if self.fx else None
          if text and x:
              text += ' (%s)'%x
          return text
  
      def format_fee_rate(self, fee_rate):
          return format_fee_satoshis(fee_rate/1000, self.num_zeros) + ' sat/byte'
  
      def get_decimal_point(self):
          return self.decimal_point
  
      def base_unit(self):
          return decimal_point_to_base_unit_name(self.decimal_point)
  
      def connect_fields(self, window, btc_e, fiat_e, fee_e):
  
          def edit_changed(edit):
              if edit.follows:
                  return
              edit.setStyleSheet(ColorScheme.DEFAULT.as_stylesheet())
              fiat_e.is_last_edited = (edit == fiat_e)
              amount = edit.get_amount()
              rate = self.fx.exchange_rate() if self.fx else Decimal('NaN')
              if rate.is_nan() or amount is None:
                  if edit is fiat_e:
                      btc_e.setText("")
                      if fee_e:
                          fee_e.setText("")
                  else:
                      fiat_e.setText("")
              else:
                  if edit is fiat_e:
                      btc_e.follows = True
                      btc_e.setAmount(int(amount / Decimal(rate) * COIN))
                      btc_e.setStyleSheet(ColorScheme.BLUE.as_stylesheet())
                      btc_e.follows = False
                      if fee_e:
                          window.update_fee()
                  else:
                      fiat_e.follows = True
                      fiat_e.setText(self.fx.ccy_amount_str(
                          amount * Decimal(rate) / COIN, False))
                      fiat_e.setStyleSheet(ColorScheme.BLUE.as_stylesheet())
                      fiat_e.follows = False
  
          btc_e.follows = False
          fiat_e.follows = False
          fiat_e.textChanged.connect(partial(edit_changed, fiat_e))
          btc_e.textChanged.connect(partial(edit_changed, btc_e))
          fiat_e.is_last_edited = False
  
      def update_status(self):
          if not self.wallet:
              return
  
          if self.network is None or not self.network.is_running():
              text = _("Offline")
              icon = QIcon(":icons/status_disconnected.png")
  
          elif self.network.is_connected():
              server_height = self.network.get_server_height()
              server_lag = self.network.get_local_height() - server_height
              # Server height can be 0 after switching to a new server
              # until we get a headers subscription request response.
              # Display the synchronizing message in that case.
              if not self.wallet.up_to_date or server_height == 0:
                  text = _("Synchronizing...")
                  icon = QIcon(":icons/status_waiting.png")
              elif server_lag > 1:
                  text = _("Server is lagging ({} blocks)").format(server_lag)
                  icon = QIcon(":icons/status_lagging.png")
              else:
                  c, u, x = self.wallet.get_balance()
                  text =  _("Balance" ) + ": %s "%(self.format_amount_and_units(c))
                  if u:
                      text +=  " [%s unconfirmed]"%(self.format_amount(u, is_diff=True).strip())
                  if x:
                      text +=  " [%s unmatured]"%(self.format_amount(x, is_diff=True).strip())
  
                  # append fiat balance and price
                  if self.fx.is_enabled():
                      text += self.fx.get_fiat_status_text(c + u + x,
                          self.base_unit(), self.get_decimal_point()) or ''
                  if not self.network.proxy:
                      icon = QIcon(":icons/status_connected.png")
                  else:
                      icon = QIcon(":icons/status_connected_proxy.png")
          else:
              if self.network.proxy:
                  text = "{} ({})".format(_("Not connected"), _("proxy enabled"))
              else:
                  text = _("Not connected")
              icon = QIcon(":icons/status_disconnected.png")
  
          self.tray.setToolTip("%s (%s)" % (text, self.wallet.basename()))
          self.balance_label.setText(text)
          self.status_button.setIcon( icon )
  
  
      def update_wallet(self):
          self.update_status()
          if self.wallet.up_to_date or not self.network or not self.network.is_connected():
              self.update_tabs()
  
      def update_tabs(self):
          self.history_list.update()
          self.request_list.update()
          self.address_list.update()
          self.utxo_list.update()
          self.contact_list.update()
          self.invoice_list.update()
          self.update_completions()
  
      def create_history_tab(self):
          from .history_list import HistoryList
          self.history_list = l = HistoryList(self)
          l.searchable_list = l
          toolbar = l.create_toolbar(self.config)
          toolbar_shown = self.config.get('show_toolbar_history', False)
          l.show_toolbar(toolbar_shown)
          return self.create_list_tab(l, toolbar)
  
      def show_address(self, addr):
          from . import address_dialog
          d = address_dialog.AddressDialog(self, addr)
          d.exec_()
  
      def show_transaction(self, tx, tx_desc = None):
          '''tx_desc is set only for txs created in the Send tab'''
          show_transaction(tx, self, tx_desc)
  
      def create_receive_tab(self):
          # A 4-column grid layout.  All the stretch is in the last column.
          # The exchange rate plugin adds a fiat widget in column 2
          self.receive_grid = grid = QGridLayout()
          grid.setSpacing(8)
          grid.setColumnStretch(3, 1)
  
          self.receive_address_e = ButtonsLineEdit()
          self.receive_address_e.addCopyButton(self.app)
          self.receive_address_e.setReadOnly(True)
          msg = _('Fujicoin address where the payment should be received. Note that each payment request uses a different Fujicoin address.')
          self.receive_address_label = HelpLabel(_('Receiving address'), msg)
          self.receive_address_e.textChanged.connect(self.update_receive_qr)
          self.receive_address_e.setFocusPolicy(Qt.ClickFocus)
          grid.addWidget(self.receive_address_label, 0, 0)
          grid.addWidget(self.receive_address_e, 0, 1, 1, -1)
  
          self.receive_message_e = QLineEdit()
          grid.addWidget(QLabel(_('Description')), 1, 0)
          grid.addWidget(self.receive_message_e, 1, 1, 1, -1)
          self.receive_message_e.textChanged.connect(self.update_receive_qr)
  
          self.receive_amount_e = BTCAmountEdit(self.get_decimal_point)
          grid.addWidget(QLabel(_('Requested amount')), 2, 0)
          grid.addWidget(self.receive_amount_e, 2, 1)
          self.receive_amount_e.textChanged.connect(self.update_receive_qr)
  
          self.fiat_receive_e = AmountEdit(self.fx.get_currency if self.fx else '')
          if not self.fx or not self.fx.is_enabled():
              self.fiat_receive_e.setVisible(False)
          grid.addWidget(self.fiat_receive_e, 2, 2, Qt.AlignLeft)
          self.connect_fields(self, self.receive_amount_e, self.fiat_receive_e, None)
  
          self.expires_combo = QComboBox()
          self.expires_combo.addItems([i[0] for i in expiration_values])
          self.expires_combo.setCurrentIndex(3)
          self.expires_combo.setFixedWidth(self.receive_amount_e.width())
          msg = ' '.join([
              _('Expiration date of your request.'),
              _('This information is seen by the recipient if you send them a signed payment request.'),
              _('Expired requests have to be deleted manually from your list, in order to free the corresponding Fujicoin addresses.'),
              _('The fujicoin address never expires and will always be part of this electrum wallet.'),
          ])
          grid.addWidget(HelpLabel(_('Request expires'), msg), 3, 0)
          grid.addWidget(self.expires_combo, 3, 1)
          self.expires_label = QLineEdit('')
          self.expires_label.setReadOnly(1)
          self.expires_label.setFocusPolicy(Qt.NoFocus)
          self.expires_label.hide()
          grid.addWidget(self.expires_label, 3, 1)
  
          self.save_request_button = QPushButton(_('Save'))
          self.save_request_button.clicked.connect(self.save_payment_request)
  
          self.new_request_button = QPushButton(_('New'))
          self.new_request_button.clicked.connect(self.new_payment_request)
  
          self.receive_qr = QRCodeWidget(fixedSize=200)
          self.receive_qr.mouseReleaseEvent = lambda x: self.toggle_qr_window()
          self.receive_qr.enterEvent = lambda x: self.app.setOverrideCursor(QCursor(Qt.PointingHandCursor))
          self.receive_qr.leaveEvent = lambda x: self.app.setOverrideCursor(QCursor(Qt.ArrowCursor))
  
          self.receive_buttons = buttons = QHBoxLayout()
          buttons.addStretch(1)
          buttons.addWidget(self.save_request_button)
          buttons.addWidget(self.new_request_button)
          grid.addLayout(buttons, 4, 1, 1, 2)
  
          self.receive_requests_label = QLabel(_('Requests'))
  
          from .request_list import RequestList
          self.request_list = RequestList(self)
  
          # layout
          vbox_g = QVBoxLayout()
          vbox_g.addLayout(grid)
          vbox_g.addStretch()
  
          hbox = QHBoxLayout()
          hbox.addLayout(vbox_g)
          hbox.addWidget(self.receive_qr)
  
          w = QWidget()
          w.searchable_list = self.request_list
          vbox = QVBoxLayout(w)
          vbox.addLayout(hbox)
          vbox.addStretch(1)
          vbox.addWidget(self.receive_requests_label)
          vbox.addWidget(self.request_list)
          vbox.setStretchFactor(self.request_list, 1000)
  
          return w
  
  
      def delete_payment_request(self, addr):
          self.wallet.remove_payment_request(addr, self.config)
          self.request_list.update()
          self.clear_receive_tab()
  
      def get_request_URI(self, addr):
          req = self.wallet.receive_requests[addr]
          message = self.wallet.labels.get(addr, '')
          amount = req['amount']
          URI = util.create_URI(addr, amount, message)
          if req.get('time'):
              URI += "&time=%d"%req.get('time')
          if req.get('exp'):
              URI += "&exp=%d"%req.get('exp')
          if req.get('name') and req.get('sig'):
              sig = bfh(req.get('sig'))
              sig = bitcoin.base_encode(sig, base=58)
              URI += "&name=" + req['name'] + "&sig="+sig
          return str(URI)
  
  
      def sign_payment_request(self, addr):
          alias = self.config.get('alias')
          alias_privkey = None
          if alias and self.alias_info:
              alias_addr, alias_name, validated = self.alias_info
              if alias_addr:
                  if self.wallet.is_mine(alias_addr):
                      msg = _('This payment request will be signed.') + '\n' + _('Please enter your password')
                      password = None
                      if self.wallet.has_keystore_encryption():
                          password = self.password_dialog(msg)
                          if not password:
                              return
                      try:
                          self.wallet.sign_payment_request(addr, alias, alias_addr, password)
                      except Exception as e:
                          self.show_error(str(e))
                          return
                  else:
                      return
  
      def save_payment_request(self):
          addr = str(self.receive_address_e.text())
          amount = self.receive_amount_e.get_amount()
          message = self.receive_message_e.text()
          if not message and not amount:
              self.show_error(_('No message or amount'))
              return False
          i = self.expires_combo.currentIndex()
          expiration = list(map(lambda x: x[1], expiration_values))[i]
          req = self.wallet.make_payment_request(addr, amount, message, expiration)
          try:
              self.wallet.add_payment_request(req, self.config)
          except Exception as e:
              traceback.print_exc(file=sys.stderr)
              self.show_error(_('Error adding payment request') + ':\n' + str(e))
          else:
              self.sign_payment_request(addr)
              self.save_request_button.setEnabled(False)
          finally:
              self.request_list.update()
              self.address_list.update()
  
      def view_and_paste(self, title, msg, data):
          dialog = WindowModalDialog(self, title)
          vbox = QVBoxLayout()
          label = QLabel(msg)
          label.setWordWrap(True)
          vbox.addWidget(label)
          pr_e = ShowQRTextEdit(text=data)
          vbox.addWidget(pr_e)
          vbox.addLayout(Buttons(CopyCloseButton(pr_e.text, self.app, dialog)))
          dialog.setLayout(vbox)
          dialog.exec_()
  
      def export_payment_request(self, addr):
          r = self.wallet.receive_requests.get(addr)
          pr = paymentrequest.serialize_request(r).SerializeToString()
          name = r['id'] + '.bip70'
          fileName = self.getSaveFileName(_("Select where to save your payment request"), name, "*.bip70")
          if fileName:
              with open(fileName, "wb+") as f:
                  f.write(util.to_bytes(pr))
              self.show_message(_("Request saved successfully"))
              self.saved = True
  
      def new_payment_request(self):
          addr = self.wallet.get_unused_address()
          if addr is None:
              if not self.wallet.is_deterministic():
                  msg = [
                      _('No more addresses in your wallet.'),
                      _('You are using a non-deterministic wallet, which cannot create new addresses.'),
                      _('If you want to create new addresses, use a deterministic wallet instead.')
                     ]
                  self.show_message(' '.join(msg))
                  return
              if not self.question(_("Warning: The next address will not be recovered automatically if you restore your wallet from seed; you may need to add it manually.\n\nThis occurs because you have too many unused addresses in your wallet. To avoid this situation, use the existing addresses first.\n\nCreate anyway?")):
                  return
              addr = self.wallet.create_new_address(False)
          self.set_receive_address(addr)
          self.expires_label.hide()
          self.expires_combo.show()
          self.new_request_button.setEnabled(False)
          self.receive_message_e.setFocus(1)
  
      def set_receive_address(self, addr):
          self.receive_address_e.setText(addr)
          self.receive_message_e.setText('')
          self.receive_amount_e.setAmount(None)
  
      def clear_receive_tab(self):
          addr = self.wallet.get_receiving_address() or ''
          self.receive_address_e.setText(addr)
          self.receive_message_e.setText('')
          self.receive_amount_e.setAmount(None)
          self.expires_label.hide()
          self.expires_combo.show()
  
      def toggle_qr_window(self):
          from . import qrwindow
          if not self.qr_window:
              self.qr_window = qrwindow.QR_Window(self)
              self.qr_window.setVisible(True)
              self.qr_window_geometry = self.qr_window.geometry()
          else:
              if not self.qr_window.isVisible():
                  self.qr_window.setVisible(True)
                  self.qr_window.setGeometry(self.qr_window_geometry)
              else:
                  self.qr_window_geometry = self.qr_window.geometry()
                  self.qr_window.setVisible(False)
          self.update_receive_qr()
  
      def show_send_tab(self):
          self.tabs.setCurrentIndex(self.tabs.indexOf(self.send_tab))
  
      def show_receive_tab(self):
          self.tabs.setCurrentIndex(self.tabs.indexOf(self.receive_tab))
  
      def receive_at(self, addr):
          if not bitcoin.is_address(addr):
              return
          self.show_receive_tab()
          self.receive_address_e.setText(addr)
          self.new_request_button.setEnabled(True)
  
      def update_receive_qr(self):
          addr = str(self.receive_address_e.text())
          amount = self.receive_amount_e.get_amount()
          message = self.receive_message_e.text()
          self.save_request_button.setEnabled((amount is not None) or (message != ""))
          uri = util.create_URI(addr, amount, message)
          self.receive_qr.setData(uri)
          if self.qr_window and self.qr_window.isVisible():
              self.qr_window.set_content(addr, amount, message, uri)
  
      def set_feerounding_text(self, num_satoshis_added):
          self.feerounding_text = (_('Additional {} satoshis are going to be added.')
                                   .format(num_satoshis_added))
  
      def create_send_tab(self):
          # A 4-column grid layout.  All the stretch is in the last column.
          # The exchange rate plugin adds a fiat widget in column 2
          self.send_grid = grid = QGridLayout()
          grid.setSpacing(8)
          grid.setColumnStretch(3, 1)
  
          from .paytoedit import PayToEdit
          self.amount_e = BTCAmountEdit(self.get_decimal_point)
          self.payto_e = PayToEdit(self)
          msg = _('Recipient of the funds.') + '\n\n'\
                + _('You may enter a Fujicoin address, a label from your list of contacts (a list of completions will be proposed), or an alias (email-like address that forwards to a Fujicoin address)')
          payto_label = HelpLabel(_('Pay to'), msg)
          grid.addWidget(payto_label, 1, 0)
          grid.addWidget(self.payto_e, 1, 1, 1, -1)
  
          completer = QCompleter()
          completer.setCaseSensitivity(False)
          self.payto_e.set_completer(completer)
          completer.setModel(self.completions)
  
          msg = _('Description of the transaction (not mandatory).') + '\n\n'\
                + _('The description is not sent to the recipient of the funds. It is stored in your wallet file, and displayed in the \'History\' tab.')
          description_label = HelpLabel(_('Description'), msg)
          grid.addWidget(description_label, 2, 0)
          self.message_e = MyLineEdit()
          grid.addWidget(self.message_e, 2, 1, 1, -1)
  
          self.from_label = QLabel(_('From'))
          grid.addWidget(self.from_label, 3, 0)
          self.from_list = MyTreeWidget(self, self.from_list_menu, ['',''])
          self.from_list.setHeaderHidden(True)
          self.from_list.setMaximumHeight(80)
          grid.addWidget(self.from_list, 3, 1, 1, -1)
          self.set_pay_from([])
  
          msg = _('Amount to be sent.') + '\n\n' \
                + _('The amount will be displayed in red if you do not have enough funds in your wallet.') + ' ' \
                + _('Note that if you have frozen some of your addresses, the available funds will be lower than your total balance.') + '\n\n' \
                + _('Keyboard shortcut: type "!" to send all your coins.')
          amount_label = HelpLabel(_('Amount'), msg)
          grid.addWidget(amount_label, 4, 0)
          grid.addWidget(self.amount_e, 4, 1)
  
          self.fiat_send_e = AmountEdit(self.fx.get_currency if self.fx else '')
          if not self.fx or not self.fx.is_enabled():
              self.fiat_send_e.setVisible(False)
          grid.addWidget(self.fiat_send_e, 4, 2)
          self.amount_e.frozen.connect(
              lambda: self.fiat_send_e.setFrozen(self.amount_e.isReadOnly()))
  
          self.max_button = EnterButton(_("Max"), self.spend_max)
          self.max_button.setFixedWidth(140)
          grid.addWidget(self.max_button, 4, 3)
          hbox = QHBoxLayout()
          hbox.addStretch(1)
          grid.addLayout(hbox, 4, 4)
  
          msg = _('Fujicoin transactions are in general not free. A transaction fee is paid by the sender of the funds.') + '\n\n'\
                + _('The amount of fee can be decided freely by the sender. However, transactions with low fees take more time to be processed.') + '\n\n'\
                + _('A suggested fee is automatically added to this field. You may override it. The suggested fee increases with the size of the transaction.')
          self.fee_e_label = HelpLabel(_('Fee'), msg)
  
          def fee_cb(dyn, pos, fee_rate):
              if dyn:
                  if self.config.use_mempool_fees():
                      self.config.set_key('depth_level', pos, False)
                  else:
                      self.config.set_key('fee_level', pos, False)
              else:
                  self.config.set_key('fee_per_kb', fee_rate, False)
  
              if fee_rate:
                  fee_rate = Decimal(fee_rate)
                  self.feerate_e.setAmount(quantize_feerate(fee_rate / 1000))
              else:
                  self.feerate_e.setAmount(None)
              self.fee_e.setModified(False)
  
              self.fee_slider.activate()
              self.spend_max() if self.is_max else self.update_fee()
  
          self.fee_slider = FeeSlider(self, self.config, fee_cb)
          self.fee_slider.setFixedWidth(140)
  
          def on_fee_or_feerate(edit_changed, editing_finished):
              edit_other = self.feerate_e if edit_changed == self.fee_e else self.fee_e
              if editing_finished:
                  if edit_changed.get_amount() is None:
                      # This is so that when the user blanks the fee and moves on,
                      # we go back to auto-calculate mode and put a fee back.
                      edit_changed.setModified(False)
              else:
                  # edit_changed was edited just now, so make sure we will
                  # freeze the correct fee setting (this)
                  edit_other.setModified(False)
              self.fee_slider.deactivate()
              self.update_fee()
  
          class TxSizeLabel(QLabel):
              def setAmount(self, byte_size):
                  self.setText(('x   %s bytes   =' % byte_size) if byte_size else '')
  
          self.size_e = TxSizeLabel()
          self.size_e.setAlignment(Qt.AlignCenter)
          self.size_e.setAmount(0)
          self.size_e.setFixedWidth(140)
          self.size_e.setStyleSheet(ColorScheme.DEFAULT.as_stylesheet())
  
          self.feerate_e = FeerateEdit(lambda: 0)
          self.feerate_e.setAmount(self.config.fee_per_byte())
          self.feerate_e.textEdited.connect(partial(on_fee_or_feerate, self.feerate_e, False))
          self.feerate_e.editingFinished.connect(partial(on_fee_or_feerate, self.feerate_e, True))
  
          self.fee_e = BTCAmountEdit(self.get_decimal_point)
          self.fee_e.textEdited.connect(partial(on_fee_or_feerate, self.fee_e, False))
          self.fee_e.editingFinished.connect(partial(on_fee_or_feerate, self.fee_e, True))
  
          def feerounding_onclick():
              text = (self.feerounding_text + '\n\n' +
                      _('To somewhat protect your privacy, Electrum tries to create change with similar precision to other outputs.') + ' ' +
                      _('At most 100 satoshis might be lost due to this rounding.') + ' ' +
                      _("You can disable this setting in '{}'.").format(_('Preferences')) + '\n' +
                      _('Also, dust is not kept as change, but added to the fee.'))
              QMessageBox.information(self, 'Fee rounding', text)
  
          self.feerounding_icon = QPushButton(QIcon(':icons/info.png'), '')
          self.feerounding_icon.setFixedWidth(20)
          self.feerounding_icon.setFlat(True)
          self.feerounding_icon.clicked.connect(feerounding_onclick)
          self.feerounding_icon.setVisible(False)
  
          self.connect_fields(self, self.amount_e, self.fiat_send_e, self.fee_e)
  
          vbox_feelabel = QVBoxLayout()
          vbox_feelabel.addWidget(self.fee_e_label)
          vbox_feelabel.addStretch(1)
          grid.addLayout(vbox_feelabel, 5, 0)
  
          self.fee_adv_controls = QWidget()
          hbox = QHBoxLayout(self.fee_adv_controls)
          hbox.setContentsMargins(0, 0, 0, 0)
          hbox.addWidget(self.feerate_e)
          hbox.addWidget(self.size_e)
          hbox.addWidget(self.fee_e)
          hbox.addWidget(self.feerounding_icon, Qt.AlignLeft)
          hbox.addStretch(1)
  
          vbox_feecontrol = QVBoxLayout()
          vbox_feecontrol.addWidget(self.fee_adv_controls)
          vbox_feecontrol.addWidget(self.fee_slider)
  
          grid.addLayout(vbox_feecontrol, 5, 1, 1, -1)
  
          if not self.config.get('show_fee', False):
              self.fee_adv_controls.setVisible(False)
  
          self.preview_button = EnterButton(_("Preview"), self.do_preview)
          self.preview_button.setToolTip(_('Display the details of your transaction before signing it.'))
          self.send_button = EnterButton(_("Send"), self.do_send)
          self.clear_button = EnterButton(_("Clear"), self.do_clear)
          buttons = QHBoxLayout()
          buttons.addStretch(1)
          buttons.addWidget(self.clear_button)
          buttons.addWidget(self.preview_button)
          buttons.addWidget(self.send_button)
          grid.addLayout(buttons, 6, 1, 1, 3)
  
          self.amount_e.shortcut.connect(self.spend_max)
          self.payto_e.textChanged.connect(self.update_fee)
          self.amount_e.textEdited.connect(self.update_fee)
  
          def reset_max(text):
              self.is_max = False
              enable = not bool(text) and not self.amount_e.isReadOnly()
              self.max_button.setEnabled(enable)
          self.amount_e.textEdited.connect(reset_max)
          self.fiat_send_e.textEdited.connect(reset_max)
  
          def entry_changed():
              text = ""
  
              amt_color = ColorScheme.DEFAULT
              fee_color = ColorScheme.DEFAULT
              feerate_color = ColorScheme.DEFAULT
  
              if self.not_enough_funds:
                  amt_color, fee_color = ColorScheme.RED, ColorScheme.RED
                  feerate_color = ColorScheme.RED
                  text = _( "Not enough funds" )
                  c, u, x = self.wallet.get_frozen_balance()
                  if c+u+x:
                      text += ' (' + self.format_amount(c+u+x).strip() + ' ' + self.base_unit() + ' ' +_("are frozen") + ')'
  
              # blue color denotes auto-filled values
              elif self.fee_e.isModified():
                  feerate_color = ColorScheme.BLUE
              elif self.feerate_e.isModified():
                  fee_color = ColorScheme.BLUE
              elif self.amount_e.isModified():
                  fee_color = ColorScheme.BLUE
                  feerate_color = ColorScheme.BLUE
              else:
                  amt_color = ColorScheme.BLUE
                  fee_color = ColorScheme.BLUE
                  feerate_color = ColorScheme.BLUE
  
              self.statusBar().showMessage(text)
              self.amount_e.setStyleSheet(amt_color.as_stylesheet())
              self.fee_e.setStyleSheet(fee_color.as_stylesheet())
              self.feerate_e.setStyleSheet(feerate_color.as_stylesheet())
  
          self.amount_e.textChanged.connect(entry_changed)
          self.fee_e.textChanged.connect(entry_changed)
          self.feerate_e.textChanged.connect(entry_changed)
  
          self.invoices_label = QLabel(_('Invoices'))
          from .invoice_list import InvoiceList
          self.invoice_list = InvoiceList(self)
  
          vbox0 = QVBoxLayout()
          vbox0.addLayout(grid)
          hbox = QHBoxLayout()
          hbox.addLayout(vbox0)
          w = QWidget()
          vbox = QVBoxLayout(w)
          vbox.addLayout(hbox)
          vbox.addStretch(1)
          vbox.addWidget(self.invoices_label)
          vbox.addWidget(self.invoice_list)
          vbox.setStretchFactor(self.invoice_list, 1000)
          w.searchable_list = self.invoice_list
          run_hook('create_send_tab', grid)
          return w
  
      def spend_max(self):
          if run_hook('abort_send', self):
              return
          self.is_max = True
          self.do_update_fee()
  
      def update_fee(self):
          self.require_fee_update = True
  
      def get_payto_or_dummy(self):
          r = self.payto_e.get_recipient()
          if r:
              return r
          return (TYPE_ADDRESS, self.wallet.dummy_address())
  
      def do_update_fee(self):
          '''Recalculate the fee.  If the fee was manually input, retain it, but
          still build the TX to see if there are enough funds.
          '''
          freeze_fee = self.is_send_fee_frozen()
          freeze_feerate = self.is_send_feerate_frozen()
          amount = '!' if self.is_max else self.amount_e.get_amount()
          if amount is None:
              if not freeze_fee:
                  self.fee_e.setAmount(None)
              self.not_enough_funds = False
              self.statusBar().showMessage('')
          else:
              fee_estimator = self.get_send_fee_estimator()
              outputs = self.payto_e.get_outputs(self.is_max)
              if not outputs:
                  _type, addr = self.get_payto_or_dummy()
                  outputs = [TxOutput(_type, addr, amount)]
              is_sweep = bool(self.tx_external_keypairs)
              make_tx = lambda fee_est: \
                  self.wallet.make_unsigned_transaction(
                      self.get_coins(), outputs, self.config,
                      fixed_fee=fee_est, is_sweep=is_sweep)
              try:
                  tx = make_tx(fee_estimator)
                  self.not_enough_funds = False
              except (NotEnoughFunds, NoDynamicFeeEstimates) as e:
                  if not freeze_fee:
                      self.fee_e.setAmount(None)
                  if not freeze_feerate:
                      self.feerate_e.setAmount(None)
                  self.feerounding_icon.setVisible(False)
  
                  if isinstance(e, NotEnoughFunds):
                      self.not_enough_funds = True
                  elif isinstance(e, NoDynamicFeeEstimates):
                      try:
                          tx = make_tx(0)
                          size = tx.estimated_size()
                          self.size_e.setAmount(size)
                      except BaseException:
                          pass
                  return
              except BaseException:
                  traceback.print_exc(file=sys.stderr)
                  return
  
              size = tx.estimated_size()
              self.size_e.setAmount(size)
  
              fee = tx.get_fee()
              fee = None if self.not_enough_funds else fee
  
              # Displayed fee/fee_rate values are set according to user input.
              # Due to rounding or dropping dust in CoinChooser,
              # actual fees often differ somewhat.
              if freeze_feerate or self.fee_slider.is_active():
                  displayed_feerate = self.feerate_e.get_amount()
                  if displayed_feerate is not None:
                      displayed_feerate = quantize_feerate(displayed_feerate)
                  else:
                      # fallback to actual fee
                      displayed_feerate = quantize_feerate(fee / size) if fee is not None else None
                      self.feerate_e.setAmount(displayed_feerate)
                  displayed_fee = round(displayed_feerate * size) if displayed_feerate is not None else None
                  self.fee_e.setAmount(displayed_fee)
              else:
                  if freeze_fee:
                      displayed_fee = self.fee_e.get_amount()
                  else:
                      # fallback to actual fee if nothing is frozen
                      displayed_fee = fee
                      self.fee_e.setAmount(displayed_fee)
                  displayed_fee = displayed_fee if displayed_fee else 0
                  displayed_feerate = quantize_feerate(displayed_fee / size) if displayed_fee is not None else None
                  self.feerate_e.setAmount(displayed_feerate)
  
              # show/hide fee rounding icon
              feerounding = (fee - displayed_fee) if fee else 0
              self.set_feerounding_text(int(feerounding))
              self.feerounding_icon.setToolTip(self.feerounding_text)
              self.feerounding_icon.setVisible(abs(feerounding) >= 1)
  
              if self.is_max:
                  amount = tx.output_value()
                  __, x_fee_amount = run_hook('get_tx_extra_fee', self.wallet, tx) or (None, 0)
                  amount_after_all_fees = amount - x_fee_amount
                  self.amount_e.setAmount(amount_after_all_fees)
  
      def from_list_delete(self, item):
          i = self.from_list.indexOfTopLevelItem(item)
          self.pay_from.pop(i)
          self.redraw_from_list()
          self.update_fee()
  
      def from_list_menu(self, position):
          item = self.from_list.itemAt(position)
          menu = QMenu()
          menu.addAction(_("Remove"), lambda: self.from_list_delete(item))
          menu.exec_(self.from_list.viewport().mapToGlobal(position))
  
      def set_pay_from(self, coins):
          self.pay_from = list(coins)
          self.redraw_from_list()
  
      def redraw_from_list(self):
          self.from_list.clear()
          self.from_label.setHidden(len(self.pay_from) == 0)
          self.from_list.setHidden(len(self.pay_from) == 0)
  
          def format(x):
              h = x.get('prevout_hash')
              return h[0:10] + '...' + h[-10:] + ":%d"%x.get('prevout_n') + u'\t' + "%s"%x.get('address')
  
          for item in self.pay_from:
              self.from_list.addTopLevelItem(QTreeWidgetItem( [format(item), self.format_amount(item['value']) ]))
  
      def get_contact_payto(self, key):
          _type, label = self.contacts.get(key)
          return label + '  <' + key + '>' if _type == 'address' else key
  
      def update_completions(self):
          l = [self.get_contact_payto(key) for key in self.contacts.keys()]
          self.completions.setStringList(l)
  
      def protected(func):
          '''Password request wrapper.  The password is passed to the function
          as the 'password' named argument.  "None" indicates either an
          unencrypted wallet, or the user cancelled the password request.
          An empty input is passed as the empty string.'''
          def request_password(self, *args, **kwargs):
              parent = self.top_level_window()
              password = None
              while self.wallet.has_keystore_encryption():
                  password = self.password_dialog(parent=parent)
                  if password is None:
                      # User cancelled password input
                      return
                  try:
                      self.wallet.check_password(password)
                      break
                  except Exception as e:
                      self.show_error(str(e), parent=parent)
                      continue
  
              kwargs['password'] = password
              return func(self, *args, **kwargs)
          return request_password
  
      def is_send_fee_frozen(self):
          return self.fee_e.isVisible() and self.fee_e.isModified() \
                 and (self.fee_e.text() or self.fee_e.hasFocus())
  
      def is_send_feerate_frozen(self):
          return self.feerate_e.isVisible() and self.feerate_e.isModified() \
                 and (self.feerate_e.text() or self.feerate_e.hasFocus())
  
      def get_send_fee_estimator(self):
          if self.is_send_fee_frozen():
              fee_estimator = self.fee_e.get_amount()
          elif self.is_send_feerate_frozen():
              amount = self.feerate_e.get_amount()  # sat/byte feerate
              amount = 0 if amount is None else amount * 1000  # sat/kilobyte feerate
              fee_estimator = partial(
                  simple_config.SimpleConfig.estimate_fee_for_feerate, amount)
          else:
              fee_estimator = None
          return fee_estimator
  
      def read_send_tab(self):
          if self.payment_request and self.payment_request.has_expired():
              self.show_error(_('Payment request has expired'))
              return
          label = self.message_e.text()
  
          if self.payment_request:
              outputs = self.payment_request.get_outputs()
          else:
              errors = self.payto_e.get_errors()
              if errors:
                  self.show_warning(_("Invalid Lines found:") + "\n\n" + '\n'.join([ _("Line #") + str(x[0]+1) + ": " + x[1] for x in errors]))
                  return
              outputs = self.payto_e.get_outputs(self.is_max)
  
              if self.payto_e.is_alias and self.payto_e.validated is False:
                  alias = self.payto_e.toPlainText()
                  msg = _('WARNING: the alias "{}" could not be validated via an additional '
                          'security check, DNSSEC, and thus may not be correct.').format(alias) + '\n'
                  msg += _('Do you wish to continue?')
                  if not self.question(msg):
                      return
  
          if not outputs:
              self.show_error(_('No outputs'))
              return
  
          for o in outputs:
              if o.address is None:
                  self.show_error(_('Fujicoin Address is None'))
                  return
              if o.type == TYPE_ADDRESS and not bitcoin.is_address(o.address):
                  self.show_error(_('Invalid Fujicoin Address'))
                  return
              if o.value is None:
                  self.show_error(_('Invalid Amount'))
                  return
  
          fee_estimator = self.get_send_fee_estimator()
          coins = self.get_coins()
          return outputs, fee_estimator, label, coins
  
      def do_preview(self):
          self.do_send(preview = True)
  
      def do_send(self, preview = False):
          if run_hook('abort_send', self):
              return
          r = self.read_send_tab()
          if not r:
              return
          outputs, fee_estimator, tx_desc, coins = r
          try:
              is_sweep = bool(self.tx_external_keypairs)
              tx = self.wallet.make_unsigned_transaction(
                  coins, outputs, self.config, fixed_fee=fee_estimator,
                  is_sweep=is_sweep)
          except NotEnoughFunds:
              self.show_message(_("Insufficient funds"))
              return
          except BaseException as e:
              traceback.print_exc(file=sys.stdout)
              self.show_message(str(e))
              return
  
          amount = tx.output_value() if self.is_max else sum(map(lambda x:x[2], outputs))
          fee = tx.get_fee()
  
          use_rbf = self.config.get('use_rbf', False)
          if use_rbf:
              tx.set_rbf(True)
  
          if fee < self.wallet.relayfee() * tx.estimated_size() / 1000:
              self.show_error('\n'.join([
                  _("This transaction requires a higher fee, or it will not be propagated by your current server"),
                  _("Try to raise your transaction fee, or use a server with a lower relay fee.")
              ]))
              return
  
          if preview:
              self.show_transaction(tx, tx_desc)
              return
  
          if not self.network:
              self.show_error(_("You can't broadcast a transaction without a live network connection."))
              return
  
          # confirmation dialog
          msg = [
              _("Amount to be sent") + ": " + self.format_amount_and_units(amount),
              _("Mining fee") + ": " + self.format_amount_and_units(fee),
          ]
  
          x_fee = run_hook('get_tx_extra_fee', self.wallet, tx)
          if x_fee:
              x_fee_address, x_fee_amount = x_fee
              msg.append( _("Additional fees") + ": " + self.format_amount_and_units(x_fee_amount) )
  
          confirm_rate = simple_config.FEERATE_WARNING_HIGH_FEE
          if fee > confirm_rate * tx.estimated_size() / 1000:
              msg.append(_('Warning') + ': ' + _("The fee for this transaction seems unusually high."))
  
          if self.wallet.has_keystore_encryption():
              msg.append("")
              msg.append(_("Enter your password to proceed"))
              password = self.password_dialog('\n'.join(msg))
              if not password:
                  return
          else:
              msg.append(_('Proceed?'))
              password = None
              if not self.question('\n'.join(msg)):
                  return
  
          def sign_done(success):
              if success:
                  if not tx.is_complete():
                      self.show_transaction(tx)
                      self.do_clear()
                  else:
                      self.broadcast_transaction(tx, tx_desc)
          self.sign_tx_with_password(tx, sign_done, password)
  
      @protected
      def sign_tx(self, tx, callback, password):
          self.sign_tx_with_password(tx, callback, password)
  
      def sign_tx_with_password(self, tx, callback, password):
          '''Sign the transaction in a separate thread.  When done, calls
          the callback with a success code of True or False.
          '''
          def on_success(result):
              callback(True)
          def on_failure(exc_info):
              self.on_error(exc_info)
              callback(False)
          on_success = run_hook('tc_sign_wrapper', self.wallet, tx, on_success, on_failure) or on_success
          if self.tx_external_keypairs:
              # can sign directly
              task = partial(Transaction.sign, tx, self.tx_external_keypairs)
          else:
              task = partial(self.wallet.sign_transaction, tx, password)
          msg = _('Signing transaction...')
          WaitingDialog(self, msg, task, on_success, on_failure)
  
      def broadcast_transaction(self, tx, tx_desc):
  
          def broadcast_thread():
              # non-GUI thread
              pr = self.payment_request
              if pr and pr.has_expired():
                  self.payment_request = None
                  return False, _("Payment request has expired")
              status, msg = self.network.broadcast_transaction(tx)
              if pr and status is True:
                  self.invoices.set_paid(pr, tx.txid())
                  self.invoices.save()
                  self.payment_request = None
                  refund_address = self.wallet.get_receiving_addresses()[0]
                  ack_status, ack_msg = pr.send_ack(str(tx), refund_address)
                  if ack_status:
                      msg = ack_msg
              return status, msg
  
          # Capture current TL window; override might be removed on return
          parent = self.top_level_window(lambda win: isinstance(win, MessageBoxMixin))
  
          def broadcast_done(result):
              # GUI thread
              if result:
                  status, msg = result
                  if status:
                      if tx_desc is not None and tx.is_complete():
                          self.wallet.set_label(tx.txid(), tx_desc)
                      parent.show_message(_('Payment sent.') + '\n' + msg)
                      self.invoice_list.update()
                      self.do_clear()
                  else:
                      parent.show_error(msg)
  
          WaitingDialog(self, _('Broadcasting transaction...'),
                        broadcast_thread, broadcast_done, self.on_error)
  
      def query_choice(self, msg, choices):
          # Needed by QtHandler for hardware wallets
          dialog = WindowModalDialog(self.top_level_window())
          clayout = ChoicesLayout(msg, choices)
          vbox = QVBoxLayout(dialog)
          vbox.addLayout(clayout.layout())
          vbox.addLayout(Buttons(OkButton(dialog)))
          if not dialog.exec_():
              return None
          return clayout.selected_index()
  
      def lock_amount(self, b):
          self.amount_e.setFrozen(b)
          self.max_button.setEnabled(not b)
  
      def prepare_for_payment_request(self):
          self.show_send_tab()
          self.payto_e.is_pr = True
          for e in [self.payto_e, self.message_e]:
              e.setFrozen(True)
          self.lock_amount(True)
          self.payto_e.setText(_("please wait..."))
          return True
  
      def delete_invoice(self, key):
          self.invoices.remove(key)
          self.invoice_list.update()
  
      def payment_request_ok(self):
          pr = self.payment_request
          key = self.invoices.add(pr)
          status = self.invoices.get_status(key)
          self.invoice_list.update()
          if status == PR_PAID:
              self.show_message("invoice already paid")
              self.do_clear()
              self.payment_request = None
              return
          self.payto_e.is_pr = True
          if not pr.has_expired():
              self.payto_e.setGreen()
          else:
              self.payto_e.setExpired()
          self.payto_e.setText(pr.get_requestor())
          self.amount_e.setText(format_satoshis_plain(pr.get_amount(), self.decimal_point))
          self.message_e.setText(pr.get_memo())
          # signal to set fee
          self.amount_e.textEdited.emit("")
  
      def payment_request_error(self):
          self.show_message(self.payment_request.error)
          self.payment_request = None
          self.do_clear()
  
      def on_pr(self, request):
          self.payment_request = request
          if self.payment_request.verify(self.contacts):
              self.payment_request_ok_signal.emit()
          else:
              self.payment_request_error_signal.emit()
  
      def pay_to_URI(self, URI):
          if not URI:
              return
          try:
              out = util.parse_URI(URI, self.on_pr)
          except BaseException as e:
              self.show_error(_('Invalid fujicoin URI:') + '\n' + str(e))
              return
          self.show_send_tab()
          r = out.get('r')
          sig = out.get('sig')
          name = out.get('name')
          if r or (name and sig):
              self.prepare_for_payment_request()
              return
          address = out.get('address')
          amount = out.get('amount')
          label = out.get('label')
          message = out.get('message')
          # use label as description (not BIP21 compliant)
          if label and not message:
              message = label
          if address:
              self.payto_e.setText(address)
          if message:
              self.message_e.setText(message)
          if amount:
              self.amount_e.setAmount(amount)
              self.amount_e.textEdited.emit("")
  
  
      def do_clear(self):
          self.is_max = False
          self.not_enough_funds = False
          self.payment_request = None
          self.payto_e.is_pr = False
          for e in [self.payto_e, self.message_e, self.amount_e, self.fiat_send_e,
                    self.fee_e, self.feerate_e]:
              e.setText('')
              e.setFrozen(False)
          self.fee_slider.activate()
          self.feerate_e.setAmount(self.config.fee_per_byte())
          self.size_e.setAmount(0)
          self.feerounding_icon.setVisible(False)
          self.set_pay_from([])
          self.tx_external_keypairs = {}
          self.update_status()
          run_hook('do_clear', self)
  
      def set_frozen_state(self, addrs, freeze):
          self.wallet.set_frozen_state(addrs, freeze)
          self.address_list.update()
          self.utxo_list.update()
          self.update_fee()
  
      def create_list_tab(self, l, toolbar=None):
          w = QWidget()
          w.searchable_list = l
          vbox = QVBoxLayout()
          w.setLayout(vbox)
          vbox.setContentsMargins(0, 0, 0, 0)
          vbox.setSpacing(0)
          if toolbar:
              vbox.addLayout(toolbar)
          vbox.addWidget(l)
          return w
  
      def create_addresses_tab(self):
          from .address_list import AddressList
          self.address_list = l = AddressList(self)
          toolbar = l.create_toolbar(self.config)
          toolbar_shown = self.config.get('show_toolbar_addresses', False)
          l.show_toolbar(toolbar_shown)
          return self.create_list_tab(l, toolbar)
  
      def create_utxo_tab(self):
          from .utxo_list import UTXOList
          self.utxo_list = l = UTXOList(self)
          return self.create_list_tab(l)
  
      def create_contacts_tab(self):
          from .contact_list import ContactList
          self.contact_list = l = ContactList(self)
          return self.create_list_tab(l)
  
      def remove_address(self, addr):
          if self.question(_("Do you want to remove {} from your wallet?").format(addr)):
              self.wallet.delete_address(addr)
              self.need_update.set()  # history, addresses, coins
              self.clear_receive_tab()
  
      def get_coins(self):
          if self.pay_from:
              return self.pay_from
          else:
              return self.wallet.get_spendable_coins(None, self.config)
  
      def spend_coins(self, coins):
          self.set_pay_from(coins)
          self.show_send_tab()
          self.update_fee()
  
      def paytomany(self):
          self.show_send_tab()
          self.payto_e.paytomany()
          msg = '\n'.join([
              _('Enter a list of outputs in the \'Pay to\' field.'),
              _('One output per line.'),
              _('Format: address, amount'),
              _('You may load a CSV file using the file icon.')
          ])
          self.show_message(msg, title=_('Pay to many'))
  
      def payto_contacts(self, labels):
          paytos = [self.get_contact_payto(label) for label in labels]
          self.show_send_tab()
          if len(paytos) == 1:
              self.payto_e.setText(paytos[0])
              self.amount_e.setFocus()
          else:
              text = "\n".join([payto + ", 0" for payto in paytos])
              self.payto_e.setText(text)
              self.payto_e.setFocus()
  
      def set_contact(self, label, address):
          if not is_address(address):
              self.show_error(_('Invalid Address'))
              self.contact_list.update()  # Displays original unchanged value
              return False
          self.contacts[address] = ('address', label)
          self.contact_list.update()
          self.history_list.update()
          self.update_completions()
          return True
  
      def delete_contacts(self, labels):
          if not self.question(_("Remove {} from your list of contacts?")
                               .format(" + ".join(labels))):
              return
          for label in labels:
              self.contacts.pop(label)
          self.history_list.update()
          self.contact_list.update()
          self.update_completions()
  
      def show_invoice(self, key):
          pr = self.invoices.get(key)
          if pr is None:
              self.show_error('Cannot find payment request in wallet.')
              return
          pr.verify(self.contacts)
          self.show_pr_details(pr)
  
      def show_pr_details(self, pr):
          key = pr.get_id()
          d = WindowModalDialog(self, _("Invoice"))
          vbox = QVBoxLayout(d)
          grid = QGridLayout()
          grid.addWidget(QLabel(_("Requestor") + ':'), 0, 0)
          grid.addWidget(QLabel(pr.get_requestor()), 0, 1)
          grid.addWidget(QLabel(_("Amount") + ':'), 1, 0)
          outputs_str = '\n'.join(map(lambda x: self.format_amount(x[2])+ self.base_unit() + ' @ ' + x[1], pr.get_outputs()))
          grid.addWidget(QLabel(outputs_str), 1, 1)
          expires = pr.get_expiration_date()
          grid.addWidget(QLabel(_("Memo") + ':'), 2, 0)
          grid.addWidget(QLabel(pr.get_memo()), 2, 1)
          grid.addWidget(QLabel(_("Signature") + ':'), 3, 0)
          grid.addWidget(QLabel(pr.get_verify_status()), 3, 1)
          if expires:
              grid.addWidget(QLabel(_("Expires") + ':'), 4, 0)
              grid.addWidget(QLabel(format_time(expires)), 4, 1)
          vbox.addLayout(grid)
          def do_export():
              fn = self.getSaveFileName(_("Save invoice to file"), "*.bip70")
              if not fn:
                  return
              with open(fn, 'wb') as f:
                  data = f.write(pr.raw)
              self.show_message(_('Invoice saved as' + ' ' + fn))
          exportButton = EnterButton(_('Save'), do_export)
          def do_delete():
              if self.question(_('Delete invoice?')):
                  self.invoices.remove(key)
                  self.history_list.update()
                  self.invoice_list.update()
                  d.close()
          deleteButton = EnterButton(_('Delete'), do_delete)
          vbox.addLayout(Buttons(exportButton, deleteButton, CloseButton(d)))
          d.exec_()
  
      def do_pay_invoice(self, key):
          pr = self.invoices.get(key)
          self.payment_request = pr
          self.prepare_for_payment_request()
          pr.error = None  # this forces verify() to re-run
          if pr.verify(self.contacts):
              self.payment_request_ok()
          else:
              self.payment_request_error()
  
      def create_console_tab(self):
          from .console import Console
          self.console = console = Console()
          return console
  
      def update_console(self):
          console = self.console
          console.history = self.config.get("console-history",[])
          console.history_index = len(console.history)
  
          console.updateNamespace({'wallet' : self.wallet,
                                   'network' : self.network,
                                   'plugins' : self.gui_object.plugins,
                                   'window': self})
          console.updateNamespace({'util' : util, 'bitcoin':bitcoin})
  
          c = commands.Commands(self.config, self.wallet, self.network, lambda: self.console.set_json(True))
          methods = {}
          def mkfunc(f, method):
              return lambda *args: f(method, args, self.password_dialog)
          for m in dir(c):
              if m[0]=='_' or m in ['network','wallet']: continue
              methods[m] = mkfunc(c._run, m)
  
          console.updateNamespace(methods)
  
      def create_status_bar(self):
  
          sb = QStatusBar()
          sb.setFixedHeight(35)
          qtVersion = qVersion()
  
          self.balance_label = QLabel("")
          self.balance_label.setTextInteractionFlags(Qt.TextSelectableByMouse)
          self.balance_label.setStyleSheet("""QLabel { padding: 0 }""")
          sb.addWidget(self.balance_label)
  
          self.search_box = QLineEdit()
          self.search_box.textChanged.connect(self.do_search)
          self.search_box.hide()
          sb.addPermanentWidget(self.search_box)
  
          self.lock_icon = QIcon()
          self.password_button = StatusBarButton(self.lock_icon, _("Password"), self.change_password_dialog )
          sb.addPermanentWidget(self.password_button)
  
          sb.addPermanentWidget(StatusBarButton(QIcon(":icons/preferences.png"), _("Preferences"), self.settings_dialog ) )
          self.seed_button = StatusBarButton(QIcon(":icons/seed.png"), _("Seed"), self.show_seed_dialog )
          sb.addPermanentWidget(self.seed_button)
          self.status_button = StatusBarButton(QIcon(":icons/status_disconnected.png"), _("Network"), lambda: self.gui_object.show_network_dialog(self))
          sb.addPermanentWidget(self.status_button)
          run_hook('create_status_bar', sb)
          self.setStatusBar(sb)
  
      def update_lock_icon(self):
          icon = QIcon(":icons/lock.png") if self.wallet.has_password() else QIcon(":icons/unlock.png")
          self.password_button.setIcon(icon)
  
      def update_buttons_on_seed(self):
          self.seed_button.setVisible(self.wallet.has_seed())
          self.password_button.setVisible(self.wallet.may_have_password())
          self.send_button.setVisible(not self.wallet.is_watching_only())
  
      def change_password_dialog(self):
          from electrum.storage import STO_EV_XPUB_PW
          if self.wallet.get_available_storage_encryption_version() == STO_EV_XPUB_PW:
              from .password_dialog import ChangePasswordDialogForHW
              d = ChangePasswordDialogForHW(self, self.wallet)
              ok, encrypt_file = d.run()
              if not ok:
                  return
  
              try:
                  hw_dev_pw = self.wallet.keystore.get_password_for_storage_encryption()
              except UserCancelled:
                  return
              except BaseException as e:
                  traceback.print_exc(file=sys.stderr)
                  self.show_error(str(e))
                  return
              old_password = hw_dev_pw if self.wallet.has_password() else None
              new_password = hw_dev_pw if encrypt_file else None
          else:
              from .password_dialog import ChangePasswordDialogForSW
              d = ChangePasswordDialogForSW(self, self.wallet)
              ok, old_password, new_password, encrypt_file = d.run()
  
          if not ok:
              return
          try:
              self.wallet.update_password(old_password, new_password, encrypt_file)
          except InvalidPassword as e:
              self.show_error(str(e))
              return
          except BaseException:
              traceback.print_exc(file=sys.stdout)
              self.show_error(_('Failed to update password'))
              return
          msg = _('Password was updated successfully') if self.wallet.has_password() else _('Password is disabled, this wallet is not protected')
          self.show_message(msg, title=_("Success"))
          self.update_lock_icon()
  
      def toggle_search(self):
          tab = self.tabs.currentWidget()
          #if hasattr(tab, 'searchable_list'):
          #    tab.searchable_list.toggle_toolbar()
          #return
          self.search_box.setHidden(not self.search_box.isHidden())
          if not self.search_box.isHidden():
              self.search_box.setFocus(1)
          else:
              self.do_search('')
  
      def do_search(self, t):
          tab = self.tabs.currentWidget()
          if hasattr(tab, 'searchable_list'):
              tab.searchable_list.filter(t)
  
      def new_contact_dialog(self):
          d = WindowModalDialog(self, _("New Contact"))
          vbox = QVBoxLayout(d)
          vbox.addWidget(QLabel(_('New Contact') + ':'))
          grid = QGridLayout()
          line1 = QLineEdit()
          line1.setFixedWidth(280)
          line2 = QLineEdit()
          line2.setFixedWidth(280)
          grid.addWidget(QLabel(_("Address")), 1, 0)
          grid.addWidget(line1, 1, 1)
          grid.addWidget(QLabel(_("Name")), 2, 0)
          grid.addWidget(line2, 2, 1)
          vbox.addLayout(grid)
          vbox.addLayout(Buttons(CancelButton(d), OkButton(d)))
          if d.exec_():
              self.set_contact(line2.text(), line1.text())
  
      def show_master_public_keys(self):
          dialog = WindowModalDialog(self, _("Wallet Information"))
          dialog.setMinimumSize(500, 100)
          mpk_list = self.wallet.get_master_public_keys()
          vbox = QVBoxLayout()
          wallet_type = self.wallet.storage.get('wallet_type', '')
          grid = QGridLayout()
          basename = os.path.basename(self.wallet.storage.path)
          grid.addWidget(QLabel(_("Wallet name")+ ':'), 0, 0)
          grid.addWidget(QLabel(basename), 0, 1)
          grid.addWidget(QLabel(_("Wallet type")+ ':'), 1, 0)
          grid.addWidget(QLabel(wallet_type), 1, 1)
          grid.addWidget(QLabel(_("Script type")+ ':'), 2, 0)
          grid.addWidget(QLabel(self.wallet.txin_type), 2, 1)
          vbox.addLayout(grid)
          if self.wallet.is_deterministic():
              mpk_text = ShowQRTextEdit()
              mpk_text.setMaximumHeight(150)
              mpk_text.addCopyButton(self.app)
              def show_mpk(index):
                  mpk_text.setText(mpk_list[index])
              # only show the combobox in case multiple accounts are available
              if len(mpk_list) > 1:
                  def label(key):
                      if isinstance(self.wallet, Multisig_Wallet):
                          return _("cosigner") + ' ' + str(key+1)
                      return ''
                  labels = [label(i) for i in range(len(mpk_list))]
                  on_click = lambda clayout: show_mpk(clayout.selected_index())
                  labels_clayout = ChoicesLayout(_("Master Public Keys"), labels, on_click)
                  vbox.addLayout(labels_clayout.layout())
              else:
                  vbox.addWidget(QLabel(_("Master Public Key")))
              show_mpk(0)
              vbox.addWidget(mpk_text)
          vbox.addStretch(1)
          vbox.addLayout(Buttons(CloseButton(dialog)))
          dialog.setLayout(vbox)
          dialog.exec_()
  
      def remove_wallet(self):
          if self.question('\n'.join([
                  _('Delete wallet file?'),
                  "%s"%self.wallet.storage.path,
                  _('If your wallet contains funds, make sure you have saved its seed.')])):
              self._delete_wallet()
  
      @protected
      def _delete_wallet(self, password):
          wallet_path = self.wallet.storage.path
          basename = os.path.basename(wallet_path)
          self.gui_object.daemon.stop_wallet(wallet_path)
          self.close()
          os.unlink(wallet_path)
          self.show_error(_("Wallet removed: {}").format(basename))
  
      @protected
      def show_seed_dialog(self, password):
          if not self.wallet.has_seed():
              self.show_message(_('This wallet has no seed'))
              return
          keystore = self.wallet.get_keystore()
          try:
              seed = keystore.get_seed(password)
              passphrase = keystore.get_passphrase(password)
          except BaseException as e:
              self.show_error(str(e))
              return
          from .seed_dialog import SeedDialog
          d = SeedDialog(self, seed, passphrase)
          d.exec_()
  
      def show_qrcode(self, data, title = _("QR code"), parent=None):
          if not data:
              return
          d = QRDialog(data, parent or self, title)
          d.exec_()
  
      @protected
      def show_private_key(self, address, password):
          if not address:
              return
          try:
              pk, redeem_script = self.wallet.export_private_key(address, password)
          except Exception as e:
              traceback.print_exc(file=sys.stdout)
              self.show_message(str(e))
              return
          xtype = bitcoin.deserialize_privkey(pk)[0]
          d = WindowModalDialog(self, _("Private key"))
          d.setMinimumSize(600, 150)
          vbox = QVBoxLayout()
          vbox.addWidget(QLabel(_("Address") + ': ' + address))
          vbox.addWidget(QLabel(_("Script type") + ': ' + xtype))
          vbox.addWidget(QLabel(_("Private key") + ':'))
          keys_e = ShowQRTextEdit(text=pk)
          keys_e.addCopyButton(self.app)
          vbox.addWidget(keys_e)
          if redeem_script:
              vbox.addWidget(QLabel(_("Redeem Script") + ':'))
              rds_e = ShowQRTextEdit(text=redeem_script)
              rds_e.addCopyButton(self.app)
              vbox.addWidget(rds_e)
          vbox.addLayout(Buttons(CloseButton(d)))
          d.setLayout(vbox)
          d.exec_()
  
      msg_sign = _("Signing with an address actually means signing with the corresponding "
                  "private key, and verifying with the corresponding public key. The "
                  "address you have entered does not have a unique public key, so these "
                  "operations cannot be performed.") + '\n\n' + \
                 _('The operation is undefined. Not just in Electrum, but in general.')
  
      @protected
      def do_sign(self, address, message, signature, password):
          address  = address.text().strip()
          message = message.toPlainText().strip()
          if not bitcoin.is_address(address):
              self.show_message(_('Invalid Fujicoin address.'))
              return
          if self.wallet.is_watching_only():
              self.show_message(_('This is a watching-only wallet.'))
              return
          if not self.wallet.is_mine(address):
              self.show_message(_('Address not in wallet.'))
              return
          txin_type = self.wallet.get_txin_type(address)
          if txin_type not in ['p2pkh', 'p2wpkh', 'p2wpkh-p2sh']:
              self.show_message(_('Cannot sign messages with this type of address:') + \
                                ' ' + txin_type + '\n\n' + self.msg_sign)
              return
          task = partial(self.wallet.sign_message, address, message, password)
  
          def show_signed_message(sig):
              try:
                  signature.setText(base64.b64encode(sig).decode('ascii'))
              except RuntimeError:
                  # (signature) wrapped C/C++ object has been deleted
                  pass
  
          self.wallet.thread.add(task, on_success=show_signed_message)
  
      def do_verify(self, address, message, signature):
          address  = address.text().strip()
          message = message.toPlainText().strip().encode('utf-8')
          if not bitcoin.is_address(address):
              self.show_message(_('Invalid Fujicoin address.'))
              return
          try:
              # This can throw on invalid base64
              sig = base64.b64decode(str(signature.toPlainText()))
              verified = ecc.verify_message_with_address(address, sig, message)
          except Exception as e:
              verified = False
          if verified:
              self.show_message(_("Signature verified"))
          else:
              self.show_error(_("Wrong signature"))
  
      def sign_verify_message(self, address=''):
          d = WindowModalDialog(self, _('Sign/verify Message'))
          d.setMinimumSize(610, 290)
  
          layout = QGridLayout(d)
  
          message_e = QTextEdit()
          layout.addWidget(QLabel(_('Message')), 1, 0)
          layout.addWidget(message_e, 1, 1)
          layout.setRowStretch(2,3)
  
          address_e = QLineEdit()
          address_e.setText(address)
          layout.addWidget(QLabel(_('Address')), 2, 0)
          layout.addWidget(address_e, 2, 1)
  
          signature_e = QTextEdit()
          layout.addWidget(QLabel(_('Signature')), 3, 0)
          layout.addWidget(signature_e, 3, 1)
          layout.setRowStretch(3,1)
  
          hbox = QHBoxLayout()
  
          b = QPushButton(_("Sign"))
          b.clicked.connect(lambda: self.do_sign(address_e, message_e, signature_e))
          hbox.addWidget(b)
  
          b = QPushButton(_("Verify"))
          b.clicked.connect(lambda: self.do_verify(address_e, message_e, signature_e))
          hbox.addWidget(b)
  
          b = QPushButton(_("Close"))
          b.clicked.connect(d.accept)
          hbox.addWidget(b)
          layout.addLayout(hbox, 4, 1)
          d.exec_()
  
      @protected
      def do_decrypt(self, message_e, pubkey_e, encrypted_e, password):
          if self.wallet.is_watching_only():
              self.show_message(_('This is a watching-only wallet.'))
              return
          cyphertext = encrypted_e.toPlainText()
          task = partial(self.wallet.decrypt_message, pubkey_e.text(), cyphertext, password)
  
          def setText(text):
              try:
                  message_e.setText(text.decode('utf-8'))
              except RuntimeError:
                  # (message_e) wrapped C/C++ object has been deleted
                  pass
  
          self.wallet.thread.add(task, on_success=setText)
  
      def do_encrypt(self, message_e, pubkey_e, encrypted_e):
          message = message_e.toPlainText()
          message = message.encode('utf-8')
          try:
              public_key = ecc.ECPubkey(bfh(pubkey_e.text()))
          except BaseException as e:
              traceback.print_exc(file=sys.stdout)            
              self.show_warning(_('Invalid Public key')) 
              return
          encrypted = public_key.encrypt_message(message)
          encrypted_e.setText(encrypted.decode('ascii'))
  
      def encrypt_message(self, address=''):
          d = WindowModalDialog(self, _('Encrypt/decrypt Message'))
          d.setMinimumSize(610, 490)
  
          layout = QGridLayout(d)
  
          message_e = QTextEdit()
          layout.addWidget(QLabel(_('Message')), 1, 0)
          layout.addWidget(message_e, 1, 1)
          layout.setRowStretch(2,3)
  
          pubkey_e = QLineEdit()
          if address:
              pubkey = self.wallet.get_public_key(address)
              pubkey_e.setText(pubkey)
          layout.addWidget(QLabel(_('Public key')), 2, 0)
          layout.addWidget(pubkey_e, 2, 1)
  
          encrypted_e = QTextEdit()
          layout.addWidget(QLabel(_('Encrypted')), 3, 0)
          layout.addWidget(encrypted_e, 3, 1)
          layout.setRowStretch(3,1)
  
          hbox = QHBoxLayout()
          b = QPushButton(_("Encrypt"))
          b.clicked.connect(lambda: self.do_encrypt(message_e, pubkey_e, encrypted_e))
          hbox.addWidget(b)
  
          b = QPushButton(_("Decrypt"))
          b.clicked.connect(lambda: self.do_decrypt(message_e, pubkey_e, encrypted_e))
          hbox.addWidget(b)
  
          b = QPushButton(_("Close"))
          b.clicked.connect(d.accept)
          hbox.addWidget(b)
  
          layout.addLayout(hbox, 4, 1)
          d.exec_()
  
      def password_dialog(self, msg=None, parent=None):
          from .password_dialog import PasswordDialog
          parent = parent or self
          d = PasswordDialog(parent, msg)
          return d.run()
  
      def tx_from_text(self, txt):
          from electrum.transaction import tx_from_str
          try:
              tx = tx_from_str(txt)
              return Transaction(tx)
          except BaseException as e:
              self.show_critical(_("Electrum was unable to parse your transaction") + ":\n" + str(e))
              return
  
      def read_tx_from_qrcode(self):
          from electrum import qrscanner
          try:
              data = qrscanner.scan_barcode(self.config.get_video_device())
          except BaseException as e:
              self.show_error(str(e))
              return
          if not data:
              return
          # if the user scanned a fujicoin URI
          if str(data).startswith("fujicoin:"):
              self.pay_to_URI(data)
              return
          # else if the user scanned an offline signed tx
          try:
              data = bh2u(bitcoin.base_decode(data, length=None, base=43))
          except BaseException as e:
              self.show_error((_('Could not decode QR code')+':\n{}').format(e))
              return
          tx = self.tx_from_text(data)
          if not tx:
              return
          self.show_transaction(tx)
  
      def read_tx_from_file(self):
          fileName = self.getOpenFileName(_("Select your transaction file"), "*.txn")
          if not fileName:
              return
          try:
              with open(fileName, "r") as f:
                  file_content = f.read()
          except (ValueError, IOError, os.error) as reason:
              self.show_critical(_("Electrum was unable to open your transaction file") + "\n" + str(reason), title=_("Unable to read file or no transaction found"))
              return
          return self.tx_from_text(file_content)
  
      def do_process_from_text(self):
          text = text_dialog(self, _('Input raw transaction'), _("Transaction:"), _("Load transaction"))
          if not text:
              return
          tx = self.tx_from_text(text)
          if tx:
              self.show_transaction(tx)
  
      def do_process_from_file(self):
          tx = self.read_tx_from_file()
          if tx:
              self.show_transaction(tx)
  
      def do_process_from_txid(self):
          from electrum import transaction
          txid, ok = QInputDialog.getText(self, _('Lookup transaction'), _('Transaction ID') + ':')
          if ok and txid:
              txid = str(txid).strip()
              try:
                  r = self.network.get_transaction(txid)
              except BaseException as e:
                  self.show_message(str(e))
                  return
              tx = transaction.Transaction(r)
              self.show_transaction(tx)
  
      @protected
      def export_privkeys_dialog(self, password):
          if self.wallet.is_watching_only():
              self.show_message(_("This is a watching-only wallet"))
              return
  
          if isinstance(self.wallet, Multisig_Wallet):
              self.show_message(_('WARNING: This is a multi-signature wallet.') + '\n' +
                                _('It cannot be "backed up" by simply exporting these private keys.'))
  
          d = WindowModalDialog(self, _('Private keys'))
          d.setMinimumSize(980, 300)
          vbox = QVBoxLayout(d)
  
          msg = "%s\n%s\n%s" % (_("WARNING: ALL your private keys are secret."),
                                _("Exposing a single private key can compromise your entire wallet!"),
                                _("In particular, DO NOT use 'redeem private key' services proposed by third parties."))
          vbox.addWidget(QLabel(msg))
  
          e = QTextEdit()
          e.setReadOnly(True)
          vbox.addWidget(e)
  
          defaultname = 'electrum-private-keys.csv'
          select_msg = _('Select file to export your private keys to')
          hbox, filename_e, csv_button = filename_field(self, self.config, defaultname, select_msg)
          vbox.addLayout(hbox)
  
          b = OkButton(d, _('Export'))
          b.setEnabled(False)
          vbox.addLayout(Buttons(CancelButton(d), b))
  
          private_keys = {}
          addresses = self.wallet.get_addresses()
          done = False
          cancelled = False
          def privkeys_thread():
              for addr in addresses:
                  time.sleep(0.1)
                  if done or cancelled:
                      break
                  privkey = self.wallet.export_private_key(addr, password)[0]
                  private_keys[addr] = privkey
                  self.computing_privkeys_signal.emit()
              if not cancelled:
                  self.computing_privkeys_signal.disconnect()
                  self.show_privkeys_signal.emit()
  
          def show_privkeys():
              s = "\n".join( map( lambda x: x[0] + "\t"+ x[1], private_keys.items()))
              e.setText(s)
              b.setEnabled(True)
              self.show_privkeys_signal.disconnect()
              nonlocal done
              done = True
  
          def on_dialog_closed(*args):
              nonlocal done
              nonlocal cancelled
              if not done:
                  cancelled = True
                  self.computing_privkeys_signal.disconnect()
                  self.show_privkeys_signal.disconnect()
  
          self.computing_privkeys_signal.connect(lambda: e.setText("Please wait... %d/%d"%(len(private_keys),len(addresses))))
          self.show_privkeys_signal.connect(show_privkeys)
          d.finished.connect(on_dialog_closed)
          threading.Thread(target=privkeys_thread).start()
  
          if not d.exec_():
              done = True
              return
  
          filename = filename_e.text()
          if not filename:
              return
  
          try:
              self.do_export_privkeys(filename, private_keys, csv_button.isChecked())
          except (IOError, os.error) as reason:
              txt = "\n".join([
                  _("Electrum was unable to produce a private key-export."),
                  str(reason)
              ])
              self.show_critical(txt, title=_("Unable to create csv"))
  
          except Exception as e:
              self.show_message(str(e))
              return
  
          self.show_message(_("Private keys exported."))
  
      def do_export_privkeys(self, fileName, pklist, is_csv):
          with open(fileName, "w+") as f:
              if is_csv:
                  transaction = csv.writer(f)
                  transaction.writerow(["address", "private_key"])
                  for addr, pk in pklist.items():
                      transaction.writerow(["%34s"%addr,pk])
              else:
                  import json
                  f.write(json.dumps(pklist, indent = 4))
  
      def do_import_labels(self):
          def import_labels(path):
              def _validate(data):
                  return data  # TODO
  
              def import_labels_assign(data):
                  for key, value in data.items():
                      self.wallet.set_label(key, value)
              import_meta(path, _validate, import_labels_assign)
  
          def on_import():
              self.need_update.set()
          import_meta_gui(self, _('labels'), import_labels, on_import)
  
      def do_export_labels(self):
          def export_labels(filename):
              export_meta(self.wallet.labels, filename)
          export_meta_gui(self, _('labels'), export_labels)
  
      def sweep_key_dialog(self):
          d = WindowModalDialog(self, title=_('Sweep private keys'))
          d.setMinimumSize(600, 300)
  
          vbox = QVBoxLayout(d)
  
          hbox_top = QHBoxLayout()
          hbox_top.addWidget(QLabel(_("Enter private keys:")))
          hbox_top.addWidget(InfoButton(WIF_HELP_TEXT), alignment=Qt.AlignRight)
          vbox.addLayout(hbox_top)
  
          keys_e = ScanQRTextEdit(allow_multi=True)
          keys_e.setTabChangesFocus(True)
          vbox.addWidget(keys_e)
  
          addresses = self.wallet.get_unused_addresses()
          if not addresses:
              try:
                  addresses = self.wallet.get_receiving_addresses()
              except AttributeError:
                  addresses = self.wallet.get_addresses()
          h, address_e = address_field(addresses)
          vbox.addLayout(h)
  
          vbox.addStretch(1)
          button = OkButton(d, _('Sweep'))
          vbox.addLayout(Buttons(CancelButton(d), button))
          button.setEnabled(False)
  
          def get_address():
              addr = str(address_e.text()).strip()
              if bitcoin.is_address(addr):
                  return addr
  
          def get_pk():
              text = str(keys_e.toPlainText())
              return keystore.get_private_keys(text)
  
          f = lambda: button.setEnabled(get_address() is not None and get_pk() is not None)
          on_address = lambda text: address_e.setStyleSheet((ColorScheme.DEFAULT if get_address() else ColorScheme.RED).as_stylesheet())
          keys_e.textChanged.connect(f)
          address_e.textChanged.connect(f)
          address_e.textChanged.connect(on_address)
          if not d.exec_():
              return
          from electrum.wallet import sweep_preparations
          try:
              self.do_clear()
              coins, keypairs = sweep_preparations(get_pk(), self.network)
              self.tx_external_keypairs = keypairs
              self.spend_coins(coins)
              self.payto_e.setText(get_address())
              self.spend_max()
              self.payto_e.setFrozen(True)
              self.amount_e.setFrozen(True)
          except BaseException as e:
              self.show_message(str(e))
              return
          self.warn_if_watching_only()
  
      def _do_import(self, title, header_layout, func):
          text = text_dialog(self, title, header_layout, _('Import'), allow_multi=True)
          if not text:
              return
          bad = []
          good = []
          for key in str(text).split():
              try:
                  addr = func(key)
                  good.append(addr)
              except BaseException as e:
                  bad.append(key)
                  continue
          if good:
              self.show_message(_("The following addresses were added") + ':\n' + '\n'.join(good))
          if bad:
              self.show_critical(_("The following inputs could not be imported") + ':\n'+ '\n'.join(bad))
          self.address_list.update()
          self.history_list.update()
  
      def import_addresses(self):
          if not self.wallet.can_import_address():
              return
          title, msg = _('Import addresses'), _("Enter addresses")+':'
          self._do_import(title, msg, self.wallet.import_address)
  
      @protected
      def do_import_privkey(self, password):
          if not self.wallet.can_import_privkey():
              return
          title = _('Import private keys')
          header_layout = QHBoxLayout()
          header_layout.addWidget(QLabel(_("Enter private keys")+':'))
          header_layout.addWidget(InfoButton(WIF_HELP_TEXT), alignment=Qt.AlignRight)
          self._do_import(title, header_layout, lambda x: self.wallet.import_private_key(x, password))
  
      def update_fiat(self):
          b = self.fx and self.fx.is_enabled()
          self.fiat_send_e.setVisible(b)
          self.fiat_receive_e.setVisible(b)
          self.history_list.refresh_headers()
          self.history_list.update()
          self.address_list.refresh_headers()
          self.address_list.update()
          self.update_status()
  
      def settings_dialog(self):
          self.need_restart = False
          d = WindowModalDialog(self, _('Preferences'))
          vbox = QVBoxLayout()
          tabs = QTabWidget()
          gui_widgets = []
          fee_widgets = []
          tx_widgets = []
          id_widgets = []
  
          # language
          lang_help = _('Select which language is used in the GUI (after restart).')
          lang_label = HelpLabel(_('Language') + ':', lang_help)
          lang_combo = QComboBox()
          from electrum.i18n import languages
          lang_combo.addItems(list(languages.values()))
          lang_keys = list(languages.keys())
          lang_cur_setting = self.config.get("language", '')
          try:
              index = lang_keys.index(lang_cur_setting)
          except ValueError:  # not in list
              index = 0
          lang_combo.setCurrentIndex(index)
          if not self.config.is_modifiable('language'):
              for w in [lang_combo, lang_label]: w.setEnabled(False)
          def on_lang(x):
              lang_request = list(languages.keys())[lang_combo.currentIndex()]
              if lang_request != self.config.get('language'):
                  self.config.set_key("language", lang_request, True)
                  self.need_restart = True
          lang_combo.currentIndexChanged.connect(on_lang)
          gui_widgets.append((lang_label, lang_combo))
  
          nz_help = _('Number of zeros displayed after the decimal point. For example, if this is set to 2, "1." will be displayed as "1.00"')
          nz_label = HelpLabel(_('Zeros after decimal point') + ':', nz_help)
          nz = QSpinBox()
          nz.setMinimum(0)
          nz.setMaximum(self.decimal_point)
          nz.setValue(self.num_zeros)
          if not self.config.is_modifiable('num_zeros'):
              for w in [nz, nz_label]: w.setEnabled(False)
          def on_nz():
              value = nz.value()
              if self.num_zeros != value:
                  self.num_zeros = value
                  self.config.set_key('num_zeros', value, True)
                  self.history_list.update()
                  self.address_list.update()
          nz.valueChanged.connect(on_nz)
          gui_widgets.append((nz_label, nz))
  
          msg = '\n'.join([
              _('Time based: fee rate is based on average confirmation time estimates'),
              _('Mempool based: fee rate is targeting a depth in the memory pool')
              ]
          )
          fee_type_label = HelpLabel(_('Fee estimation') + ':', msg)
          fee_type_combo = QComboBox()
          fee_type_combo.addItems([_('Static'), _('ETA'), _('Mempool')])
          fee_type_combo.setCurrentIndex((2 if self.config.use_mempool_fees() else 1) if self.config.is_dynfee() else 0)
          def on_fee_type(x):
              self.config.set_key('mempool_fees', x==2)
              self.config.set_key('dynamic_fees', x>0)
              self.fee_slider.update()
          fee_type_combo.currentIndexChanged.connect(on_fee_type)
          fee_widgets.append((fee_type_label, fee_type_combo))
  
          feebox_cb = QCheckBox(_('Edit fees manually'))
          feebox_cb.setChecked(self.config.get('show_fee', False))
          feebox_cb.setToolTip(_("Show fee edit box in send tab."))
          def on_feebox(x):
              self.config.set_key('show_fee', x == Qt.Checked)
              self.fee_adv_controls.setVisible(bool(x))
          feebox_cb.stateChanged.connect(on_feebox)
          fee_widgets.append((feebox_cb, None))
  
          use_rbf_cb = QCheckBox(_('Use Replace-By-Fee'))
          use_rbf_cb.setChecked(self.config.get('use_rbf', False))
          use_rbf_cb.setToolTip(
              _('If you check this box, your transactions will be marked as non-final,') + '\n' + \
              _('and you will have the possibility, while they are unconfirmed, to replace them with transactions that pay higher fees.') + '\n' + \
              _('Note that some merchants do not accept non-final transactions until they are confirmed.'))
          def on_use_rbf(x):
              self.config.set_key('use_rbf', x == Qt.Checked)
          use_rbf_cb.stateChanged.connect(on_use_rbf)
          fee_widgets.append((use_rbf_cb, None))
  
          msg = _('OpenAlias record, used to receive coins and to sign payment requests.') + '\n\n'\
                + _('The following alias providers are available:') + '\n'\
                + '\n'.join(['https://cryptoname.co/', 'http://xmr.link']) + '\n\n'\
                + 'For more information, see https://openalias.org'
          alias_label = HelpLabel(_('OpenAlias') + ':', msg)
          alias = self.config.get('alias','')
          alias_e = QLineEdit(alias)
          def set_alias_color():
              if not self.config.get('alias'):
                  alias_e.setStyleSheet("")
                  return
              if self.alias_info:
                  alias_addr, alias_name, validated = self.alias_info
                  alias_e.setStyleSheet((ColorScheme.GREEN if validated else ColorScheme.RED).as_stylesheet(True))
              else:
                  alias_e.setStyleSheet(ColorScheme.RED.as_stylesheet(True))
          def on_alias_edit():
              alias_e.setStyleSheet("")
              alias = str(alias_e.text())
              self.config.set_key('alias', alias, True)
              if alias:
                  self.fetch_alias()
          set_alias_color()
          self.alias_received_signal.connect(set_alias_color)
          alias_e.editingFinished.connect(on_alias_edit)
          id_widgets.append((alias_label, alias_e))
  
          # SSL certificate
          msg = ' '.join([
              _('SSL certificate used to sign payment requests.'),
              _('Use setconfig to set ssl_chain and ssl_privkey.'),
          ])
          if self.config.get('ssl_privkey') or self.config.get('ssl_chain'):
              try:
                  SSL_identity = paymentrequest.check_ssl_config(self.config)
                  SSL_error = None
              except BaseException as e:
                  SSL_identity = "error"
                  SSL_error = str(e)
          else:
              SSL_identity = ""
              SSL_error = None
          SSL_id_label = HelpLabel(_('SSL certificate') + ':', msg)
          SSL_id_e = QLineEdit(SSL_identity)
          SSL_id_e.setStyleSheet((ColorScheme.RED if SSL_error else ColorScheme.GREEN).as_stylesheet(True) if SSL_identity else '')
          if SSL_error:
              SSL_id_e.setToolTip(SSL_error)
          SSL_id_e.setReadOnly(True)
          id_widgets.append((SSL_id_label, SSL_id_e))
  
          units = base_units_list
          msg = (_('Base unit of your wallet.')
                 + '\n1 FJC = 1000 mFJC. 1 mFJC = 1000 bits. 1 bit = 100 sat.\n'
                 + _('This setting affects the Send tab, and all balance related fields.'))
          unit_label = HelpLabel(_('Base unit') + ':', msg)
          unit_combo = QComboBox()
          unit_combo.addItems(units)
          unit_combo.setCurrentIndex(units.index(self.base_unit()))
          def on_unit(x, nz):
              unit_result = units[unit_combo.currentIndex()]
              if self.base_unit() == unit_result:
                  return
              edits = self.amount_e, self.fee_e, self.receive_amount_e
              amounts = [edit.get_amount() for edit in edits]
              self.decimal_point = base_unit_name_to_decimal_point(unit_result)
              self.config.set_key('decimal_point', self.decimal_point, True)
              nz.setMaximum(self.decimal_point)
              self.history_list.update()
              self.request_list.update()
              self.address_list.update()
              for edit, amount in zip(edits, amounts):
                  edit.setAmount(amount)
              self.update_status()
          unit_combo.currentIndexChanged.connect(lambda x: on_unit(x, nz))
          gui_widgets.append((unit_label, unit_combo))
  
          block_explorers = sorted(util.block_explorer_info().keys())
          msg = _('Choose which online block explorer to use for functions that open a web browser')
          block_ex_label = HelpLabel(_('Online Block Explorer') + ':', msg)
          block_ex_combo = QComboBox()
          block_ex_combo.addItems(block_explorers)
          block_ex_combo.setCurrentIndex(block_ex_combo.findText(util.block_explorer(self.config)))
          def on_be(x):
              be_result = block_explorers[block_ex_combo.currentIndex()]
              self.config.set_key('block_explorer', be_result, True)
          block_ex_combo.currentIndexChanged.connect(on_be)
          gui_widgets.append((block_ex_label, block_ex_combo))
  
          from electrum import qrscanner
          system_cameras = qrscanner._find_system_cameras()
          qr_combo = QComboBox()
          qr_combo.addItem("Default","default")
          for camera, device in system_cameras.items():
              qr_combo.addItem(camera, device)
          #combo.addItem("Manually specify a device", config.get("video_device"))
          index = qr_combo.findData(self.config.get("video_device"))
          qr_combo.setCurrentIndex(index)
          msg = _("Install the zbar package to enable this.")
          qr_label = HelpLabel(_('Video Device') + ':', msg)
          qr_combo.setEnabled(qrscanner.libzbar is not None)
          on_video_device = lambda x: self.config.set_key("video_device", qr_combo.itemData(x), True)
          qr_combo.currentIndexChanged.connect(on_video_device)
          gui_widgets.append((qr_label, qr_combo))
  
          colortheme_combo = QComboBox()
          colortheme_combo.addItem(_('Light'), 'default')
          colortheme_combo.addItem(_('Dark'), 'dark')
          index = colortheme_combo.findData(self.config.get('qt_gui_color_theme', 'default'))
          colortheme_combo.setCurrentIndex(index)
          colortheme_label = QLabel(_('Color theme') + ':')
          def on_colortheme(x):
              self.config.set_key('qt_gui_color_theme', colortheme_combo.itemData(x), True)
              self.need_restart = True
          colortheme_combo.currentIndexChanged.connect(on_colortheme)
          gui_widgets.append((colortheme_label, colortheme_combo))
  
          usechange_cb = QCheckBox(_('Use change addresses'))
          usechange_cb.setChecked(self.wallet.use_change)
          if not self.config.is_modifiable('use_change'): usechange_cb.setEnabled(False)
          def on_usechange(x):
              usechange_result = x == Qt.Checked
              if self.wallet.use_change != usechange_result:
                  self.wallet.use_change = usechange_result
                  self.wallet.storage.put('use_change', self.wallet.use_change)
                  multiple_cb.setEnabled(self.wallet.use_change)
          usechange_cb.stateChanged.connect(on_usechange)
          usechange_cb.setToolTip(_('Using change addresses makes it more difficult for other people to track your transactions.'))
          tx_widgets.append((usechange_cb, None))
  
          def on_multiple(x):
              multiple = x == Qt.Checked
              if self.wallet.multiple_change != multiple:
                  self.wallet.multiple_change = multiple
                  self.wallet.storage.put('multiple_change', multiple)
          multiple_change = self.wallet.multiple_change
          multiple_cb = QCheckBox(_('Use multiple change addresses'))
          multiple_cb.setEnabled(self.wallet.use_change)
          multiple_cb.setToolTip('\n'.join([
              _('In some cases, use up to 3 change addresses in order to break '
                'up large coin amounts and obfuscate the recipient address.'),
              _('This may result in higher transactions fees.')
          ]))
          multiple_cb.setChecked(multiple_change)
          multiple_cb.stateChanged.connect(on_multiple)
          tx_widgets.append((multiple_cb, None))
  
          def fmt_docs(key, klass):
              lines = [ln.lstrip(" ") for ln in klass.__doc__.split("\n")]
              return '\n'.join([key, "", " ".join(lines)])
  
          choosers = sorted(coinchooser.COIN_CHOOSERS.keys())
          if len(choosers) > 1:
              chooser_name = coinchooser.get_name(self.config)
              msg = _('Choose coin (UTXO) selection method.  The following are available:\n\n')
              msg += '\n\n'.join(fmt_docs(*item) for item in coinchooser.COIN_CHOOSERS.items())
              chooser_label = HelpLabel(_('Coin selection') + ':', msg)
              chooser_combo = QComboBox()
              chooser_combo.addItems(choosers)
              i = choosers.index(chooser_name) if chooser_name in choosers else 0
              chooser_combo.setCurrentIndex(i)
              def on_chooser(x):
                  chooser_name = choosers[chooser_combo.currentIndex()]
                  self.config.set_key('coin_chooser', chooser_name)
              chooser_combo.currentIndexChanged.connect(on_chooser)
              tx_widgets.append((chooser_label, chooser_combo))
  
          def on_unconf(x):
              self.config.set_key('confirmed_only', bool(x))
          conf_only = self.config.get('confirmed_only', False)
          unconf_cb = QCheckBox(_('Spend only confirmed coins'))
          unconf_cb.setToolTip(_('Spend only confirmed inputs.'))
          unconf_cb.setChecked(conf_only)
          unconf_cb.stateChanged.connect(on_unconf)
          tx_widgets.append((unconf_cb, None))
  
          def on_outrounding(x):
              self.config.set_key('coin_chooser_output_rounding', bool(x))
          enable_outrounding = self.config.get('coin_chooser_output_rounding', False)
          outrounding_cb = QCheckBox(_('Enable output value rounding'))
          outrounding_cb.setToolTip(
              _('Set the value of the change output so that it has similar precision to the other outputs.') + '\n' +
              _('This might improve your privacy somewhat.') + '\n' +
              _('If enabled, at most 100 satoshis might be lost due to this, per transaction.'))
          outrounding_cb.setChecked(enable_outrounding)
          outrounding_cb.stateChanged.connect(on_outrounding)
          tx_widgets.append((outrounding_cb, None))
  
          # Fiat Currency
          hist_checkbox = QCheckBox()
          hist_capgains_checkbox = QCheckBox()
          fiat_address_checkbox = QCheckBox()
          ccy_combo = QComboBox()
          ex_combo = QComboBox()
  
          def update_currencies():
              if not self.fx: return
              currencies = sorted(self.fx.get_currencies(self.fx.get_history_config()))
              ccy_combo.clear()
              ccy_combo.addItems([_('None')] + currencies)
              if self.fx.is_enabled():
                  ccy_combo.setCurrentIndex(ccy_combo.findText(self.fx.get_currency()))
  
          def update_history_cb():
              if not self.fx: return
              hist_checkbox.setChecked(self.fx.get_history_config())
              hist_checkbox.setEnabled(self.fx.is_enabled())
  
          def update_fiat_address_cb():
              if not self.fx: return
              fiat_address_checkbox.setChecked(self.fx.get_fiat_address_config())
  
          def update_history_capgains_cb():
              if not self.fx: return
              hist_capgains_checkbox.setChecked(self.fx.get_history_capital_gains_config())
              hist_capgains_checkbox.setEnabled(hist_checkbox.isChecked())
  
          def update_exchanges():
              if not self.fx: return
              b = self.fx.is_enabled()
              ex_combo.setEnabled(b)
              if b:
                  h = self.fx.get_history_config()
                  c = self.fx.get_currency()
                  exchanges = self.fx.get_exchanges_by_ccy(c, h)
              else:
                  exchanges = self.fx.get_exchanges_by_ccy('USD', False)
              ex_combo.clear()
              ex_combo.addItems(sorted(exchanges))
              ex_combo.setCurrentIndex(ex_combo.findText(self.fx.config_exchange()))
  
          def on_currency(hh):
              if not self.fx: return
              b = bool(ccy_combo.currentIndex())
              ccy = str(ccy_combo.currentText()) if b else None
              self.fx.set_enabled(b)
              if b and ccy != self.fx.ccy:
                  self.fx.set_currency(ccy)
              update_history_cb()
              update_exchanges()
              self.update_fiat()
  
          def on_exchange(idx):
              exchange = str(ex_combo.currentText())
              if self.fx and self.fx.is_enabled() and exchange and exchange != self.fx.exchange.name():
                  self.fx.set_exchange(exchange)
  
          def on_history(checked):
              if not self.fx: return
              self.fx.set_history_config(checked)
              update_exchanges()
              self.history_list.refresh_headers()
              if self.fx.is_enabled() and checked:
                  # reset timeout to get historical rates
                  self.fx.timeout = 0
              update_history_capgains_cb()
  
          def on_history_capgains(checked):
              if not self.fx: return
              self.fx.set_history_capital_gains_config(checked)
              self.history_list.refresh_headers()
  
          def on_fiat_address(checked):
              if not self.fx: return
              self.fx.set_fiat_address_config(checked)
              self.address_list.refresh_headers()
              self.address_list.update()
  
          update_currencies()
          update_history_cb()
          update_history_capgains_cb()
          update_fiat_address_cb()
          update_exchanges()
          ccy_combo.currentIndexChanged.connect(on_currency)
          hist_checkbox.stateChanged.connect(on_history)
          hist_capgains_checkbox.stateChanged.connect(on_history_capgains)
          fiat_address_checkbox.stateChanged.connect(on_fiat_address)
          ex_combo.currentIndexChanged.connect(on_exchange)
  
          fiat_widgets = []
          fiat_widgets.append((QLabel(_('Fiat currency')), ccy_combo))
          fiat_widgets.append((QLabel(_('Show history rates')), hist_checkbox))
          fiat_widgets.append((QLabel(_('Show capital gains in history')), hist_capgains_checkbox))
          fiat_widgets.append((QLabel(_('Show Fiat balance for addresses')), fiat_address_checkbox))
          fiat_widgets.append((QLabel(_('Source')), ex_combo))
  
          tabs_info = [
              (fee_widgets, _('Fees')),
              (tx_widgets, _('Transactions')),
              (gui_widgets, _('Appearance')),
              (fiat_widgets, _('Fiat')),
              (id_widgets, _('Identity')),
          ]
          for widgets, name in tabs_info:
              tab = QWidget()
              grid = QGridLayout(tab)
              grid.setColumnStretch(0,1)
              for a,b in widgets:
                  i = grid.rowCount()
                  if b:
                      if a:
                          grid.addWidget(a, i, 0)
                      grid.addWidget(b, i, 1)
                  else:
                      grid.addWidget(a, i, 0, 1, 2)
              tabs.addTab(tab, name)
  
          vbox.addWidget(tabs)
          vbox.addStretch(1)
          vbox.addLayout(Buttons(CloseButton(d)))
          d.setLayout(vbox)
  
          # run the dialog
          d.exec_()
  
          if self.fx:
              self.fx.timeout = 0
  
          self.alias_received_signal.disconnect(set_alias_color)
  
          run_hook('close_settings_dialog')
          if self.need_restart:
              self.show_warning(_('Please restart Electrum to activate the new GUI settings'), title=_('Success'))
  
  
      def closeEvent(self, event):
          # It seems in some rare cases this closeEvent() is called twice
          if not self.cleaned_up:
              self.cleaned_up = True
              self.clean_up()
          event.accept()
  
      def clean_up(self):
          self.wallet.thread.stop()
          if self.network:
              self.network.unregister_callback(self.on_network)
          self.config.set_key("is_maximized", self.isMaximized())
          if not self.isMaximized():
              g = self.geometry()
              self.wallet.storage.put("winpos-qt", [g.left(),g.top(),
                                                    g.width(),g.height()])
          self.config.set_key("console-history", self.console.history[-50:],
                              True)
          if self.qr_window:
              self.qr_window.close()
          self.close_wallet()
          self.gui_object.close_window(self)
  
      def plugins_dialog(self):
          self.pluginsdialog = d = WindowModalDialog(self, _('Electrum Plugins'))
  
          plugins = self.gui_object.plugins
  
          vbox = QVBoxLayout(d)
  
          # plugins
          scroll = QScrollArea()
          scroll.setEnabled(True)
          scroll.setWidgetResizable(True)
          scroll.setMinimumSize(400,250)
          vbox.addWidget(scroll)
  
          w = QWidget()
          scroll.setWidget(w)
          w.setMinimumHeight(plugins.count() * 35)
  
          grid = QGridLayout()
          grid.setColumnStretch(0,1)
          w.setLayout(grid)
  
          settings_widgets = {}
  
          def enable_settings_widget(p, name, i):
              widget = settings_widgets.get(name)
              if not widget and p and p.requires_settings():
                  widget = settings_widgets[name] = p.settings_widget(d)
                  grid.addWidget(widget, i, 1)
              if widget:
                  widget.setEnabled(bool(p and p.is_enabled()))
  
          def do_toggle(cb, name, i):
              p = plugins.toggle(name)
              cb.setChecked(bool(p))
              enable_settings_widget(p, name, i)
              run_hook('init_qt', self.gui_object)
  
          for i, descr in enumerate(plugins.descriptions.values()):
              full_name = descr['__name__']
              prefix, _separator, name = full_name.rpartition('.')
              p = plugins.get(name)
              if descr.get('registers_keystore'):
                  continue
              try:
                  cb = QCheckBox(descr['fullname'])
                  plugin_is_loaded = p is not None
                  cb_enabled = (not plugin_is_loaded and plugins.is_available(name, self.wallet)
                                or plugin_is_loaded and p.can_user_disable())
                  cb.setEnabled(cb_enabled)
                  cb.setChecked(plugin_is_loaded and p.is_enabled())
                  grid.addWidget(cb, i, 0)
                  enable_settings_widget(p, name, i)
                  cb.clicked.connect(partial(do_toggle, cb, name, i))
                  msg = descr['description']
                  if descr.get('requires'):
                      msg += '\n\n' + _('Requires') + ':\n' + '\n'.join(map(lambda x: x[1], descr.get('requires')))
                  grid.addWidget(HelpButton(msg), i, 2)
              except Exception:
                  self.print_msg("error: cannot display plugin", name)
                  traceback.print_exc(file=sys.stdout)
          grid.setRowStretch(len(plugins.descriptions.values()), 1)
          vbox.addLayout(Buttons(CloseButton(d)))
          d.exec_()
  
      def cpfp(self, parent_tx, new_tx):
          total_size = parent_tx.estimated_size() + new_tx.estimated_size()
          d = WindowModalDialog(self, _('Child Pays for Parent'))
          vbox = QVBoxLayout(d)
          msg = (
              "A CPFP is a transaction that sends an unconfirmed output back to "
              "yourself, with a high fee. The goal is to have miners confirm "
              "the parent transaction in order to get the fee attached to the "
              "child transaction.")
          vbox.addWidget(WWLabel(_(msg)))
          msg2 = ("The proposed fee is computed using your "
              "fee/kB settings, applied to the total size of both child and "
              "parent transactions. After you broadcast a CPFP transaction, "
              "it is normal to see a new unconfirmed transaction in your history.")
          vbox.addWidget(WWLabel(_(msg2)))
          grid = QGridLayout()
          grid.addWidget(QLabel(_('Total size') + ':'), 0, 0)
          grid.addWidget(QLabel('%d bytes'% total_size), 0, 1)
          max_fee = new_tx.output_value()
          grid.addWidget(QLabel(_('Input amount') + ':'), 1, 0)
          grid.addWidget(QLabel(self.format_amount(max_fee) + ' ' + self.base_unit()), 1, 1)
          output_amount = QLabel('')
          grid.addWidget(QLabel(_('Output amount') + ':'), 2, 0)
          grid.addWidget(output_amount, 2, 1)
          fee_e = BTCAmountEdit(self.get_decimal_point)
          # FIXME with dyn fees, without estimates, there are all kinds of crashes here
          def f(x):
              a = max_fee - fee_e.get_amount()
              output_amount.setText((self.format_amount(a) + ' ' + self.base_unit()) if a else '')
          fee_e.textChanged.connect(f)
          fee = self.config.fee_per_kb() * total_size / 1000
          fee_e.setAmount(fee)
          grid.addWidget(QLabel(_('Fee' + ':')), 3, 0)
          grid.addWidget(fee_e, 3, 1)
          def on_rate(dyn, pos, fee_rate):
              fee = fee_rate * total_size / 1000
              fee = min(max_fee, fee)
              fee_e.setAmount(fee)
          fee_slider = FeeSlider(self, self.config, on_rate)
          fee_slider.update()
          grid.addWidget(fee_slider, 4, 1)
          vbox.addLayout(grid)
          vbox.addLayout(Buttons(CancelButton(d), OkButton(d)))
          if not d.exec_():
              return
          fee = fee_e.get_amount()
          if fee > max_fee:
              self.show_error(_('Max fee exceeded'))
              return
          new_tx = self.wallet.cpfp(parent_tx, fee)
          new_tx.set_rbf(True)
          self.show_transaction(new_tx)
  
      def bump_fee_dialog(self, tx):
          is_relevant, is_mine, v, fee = self.wallet.get_wallet_delta(tx)
          if fee is None:
              self.show_error(_("Can't bump fee: unknown fee for original transaction."))
              return
          tx_label = self.wallet.get_label(tx.txid())
          tx_size = tx.estimated_size()
          d = WindowModalDialog(self, _('Bump Fee'))
          vbox = QVBoxLayout(d)
          vbox.addWidget(QLabel(_('Current fee') + ': %s'% self.format_amount(fee) + ' ' + self.base_unit()))
          vbox.addWidget(QLabel(_('New fee' + ':')))
  
          fee_e = BTCAmountEdit(self.get_decimal_point)
          fee_e.setAmount(fee * 1.5)
          vbox.addWidget(fee_e)
  
          def on_rate(dyn, pos, fee_rate):
              fee = fee_rate * tx_size / 1000
              fee_e.setAmount(fee)
          fee_slider = FeeSlider(self, self.config, on_rate)
          vbox.addWidget(fee_slider)
          cb = QCheckBox(_('Final'))
          vbox.addWidget(cb)
          vbox.addLayout(Buttons(CancelButton(d), OkButton(d)))
          if not d.exec_():
              return
          is_final = cb.isChecked()
          new_fee = fee_e.get_amount()
          delta = new_fee - fee
          if delta < 0:
              self.show_error("fee too low")
              return
          try:
              new_tx = self.wallet.bump_fee(tx, delta)
          except CannotBumpFee as e:
              self.show_error(str(e))
              return
          if is_final:
              new_tx.set_rbf(False)
          self.show_transaction(new_tx, tx_label)
  
      def save_transaction_into_wallet(self, tx):
          win = self.top_level_window()
          try:
              if not self.wallet.add_transaction(tx.txid(), tx):
                  win.show_error(_("Transaction could not be saved.") + "\n" +
                                 _("It conflicts with current history."))
                  return False
          except AddTransactionException as e:
              win.show_error(e)
              return False
          else:
              self.wallet.save_transactions(write=True)
              # need to update at least: history_list, utxo_list, address_list
              self.need_update.set()
              msg = (_("Transaction added to wallet history.") + '\n\n' +
                     _("Note: this is an offline transaction, if you want the network "
                       "to see it, you need to broadcast it."))
              win.msg_box(QPixmap(":icons/offline_tx.png"), None, _('Success'), msg)
              return True
  