text: #!/usr/bin/env python
  #
  # Electrum - lightweight Bitcoin client
  # Copyright (C) 2015 Thomas Voegtlin
  #
  # 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 webbrowser
  from enum import IntEnum
  
  from PyQt5.QtCore import Qt, QPersistentModelIndex, QModelIndex
  from PyQt5.QtGui import QStandardItemModel, QStandardItem, QFont
  from PyQt5.QtWidgets import QAbstractItemView, QComboBox, QLabel, QMenu
  
  from electrum_mona.i18n import _
  from electrum_mona.util import block_explorer_URL, profiler
  from electrum_mona.plugin import run_hook
  from electrum_mona.bitcoin import is_address
  from electrum_mona.wallet import InternalAddressCorruption
  
  from .util import MyTreeView, MONOSPACE_FONT, ColorScheme
  
  
  class AddressList(MyTreeView):
  
      class Columns(IntEnum):
          TYPE = 0
          ADDRESS = 1
          LABEL = 2
          COIN_BALANCE = 3
          FIAT_BALANCE = 4
          NUM_TXS = 5
  
      filter_columns = [Columns.TYPE, Columns.ADDRESS, Columns.LABEL, Columns.COIN_BALANCE]
  
      def __init__(self, parent=None):
          super().__init__(parent, self.create_menu, stretch_column=self.Columns.LABEL)
          self.setSelectionMode(QAbstractItemView.ExtendedSelection)
          self.setSortingEnabled(True)
          self.show_change = 0
          self.show_used = 0
          self.change_button = QComboBox(self)
          self.change_button.currentIndexChanged.connect(self.toggle_change)
          for t in [_('All'), _('Receiving'), _('Change')]:
              self.change_button.addItem(t)
          self.used_button = QComboBox(self)
          self.used_button.currentIndexChanged.connect(self.toggle_used)
          for t in [_('All'), _('Unused'), _('Funded'), _('Used')]:
              self.used_button.addItem(t)
          self.setModel(QStandardItemModel(self))
          self.update()
  
      def get_toolbar_buttons(self):
          return QLabel(_("Filter:")), self.change_button, self.used_button
  
      def on_hide_toolbar(self):
          self.show_change = 0
          self.show_used = 0
          self.update()
  
      def save_toolbar_state(self, state, config):
          config.set_key('show_toolbar_addresses', state)
  
      def refresh_headers(self):
          fx = self.parent.fx
          if fx and fx.get_fiat_address_config():
              ccy = fx.get_currency()
          else:
              ccy = _('Fiat')
          headers = {
              self.Columns.TYPE: _('Type'),
              self.Columns.ADDRESS: _('Address'),
              self.Columns.LABEL: _('Label'),
              self.Columns.COIN_BALANCE: _('Balance'),
              self.Columns.FIAT_BALANCE: ccy + ' ' + _('Balance'),
              self.Columns.NUM_TXS: _('Tx'),
          }
          self.update_headers(headers)
  
      def toggle_change(self, state):
          if state == self.show_change:
              return
          self.show_change = state
          self.update()
  
      def toggle_used(self, state):
          if state == self.show_used:
              return
          self.show_used = state
          self.update()
  
      @profiler
      def update(self):
          self.wallet = self.parent.wallet
          current_address = self.current_item_user_role(col=self.Columns.LABEL)
          if self.show_change == 1:
              addr_list = self.wallet.get_receiving_addresses()
          elif self.show_change == 2:
              addr_list = self.wallet.get_change_addresses()
          else:
              addr_list = self.wallet.get_addresses()
          self.model().clear()
          self.refresh_headers()
          fx = self.parent.fx
          set_address = None
          for address in addr_list:
              num = self.wallet.get_address_history_len(address)
              label = self.wallet.labels.get(address, '')
              c, u, x = self.wallet.get_addr_balance(address)
              balance = c + u + x
              is_used_and_empty = self.wallet.is_used(address) and balance == 0
              if self.show_used == 1 and (balance or is_used_and_empty):
                  continue
              if self.show_used == 2 and balance == 0:
                  continue
              if self.show_used == 3 and not is_used_and_empty:
                  continue
              balance_text = self.parent.format_amount(balance, whitespaces=True)
              # create item
              if fx and fx.get_fiat_address_config():
                  rate = fx.exchange_rate()
                  fiat_balance = fx.value_str(balance, rate)
              else:
                  fiat_balance = ''
              labels = ['', address, label, balance_text, fiat_balance, "%d"%num]
              address_item = [QStandardItem(e) for e in labels]
              # align text and set fonts
              for i, item in enumerate(address_item):
                  item.setTextAlignment(Qt.AlignVCenter)
                  if i not in (self.Columns.TYPE, self.Columns.LABEL):
                      item.setFont(QFont(MONOSPACE_FONT))
                  item.setEditable(i in self.editable_columns)
              address_item[self.Columns.FIAT_BALANCE].setTextAlignment(Qt.AlignRight | Qt.AlignVCenter)
              # setup column 0
              if self.wallet.is_change(address):
                  address_item[self.Columns.TYPE].setText(_('change'))
                  address_item[self.Columns.TYPE].setBackground(ColorScheme.YELLOW.as_color(True))
              else:
                  address_item[self.Columns.TYPE].setText(_('receiving'))
                  address_item[self.Columns.TYPE].setBackground(ColorScheme.GREEN.as_color(True))
              address_item[self.Columns.LABEL].setData(address, Qt.UserRole)
              # setup column 1
              if self.wallet.is_frozen_address(address):
                  address_item[self.Columns.ADDRESS].setBackground(ColorScheme.BLUE.as_color(True))
              if self.wallet.is_beyond_limit(address):
                  address_item[self.Columns.ADDRESS].setBackground(ColorScheme.RED.as_color(True))
              # add item
              count = self.model().rowCount()
              self.model().insertRow(count, address_item)
              address_idx = self.model().index(count, self.Columns.LABEL)
              if address == current_address:
                  set_address = QPersistentModelIndex(address_idx)
          self.set_current_idx(set_address)
          # show/hide columns
          if fx and fx.get_fiat_address_config():
              self.showColumn(self.Columns.FIAT_BALANCE)
          else:
              self.hideColumn(self.Columns.FIAT_BALANCE)
          self.filter()
  
      def create_menu(self, position):
          from electrum_mona.wallet import Multisig_Wallet
          is_multisig = isinstance(self.wallet, Multisig_Wallet)
          can_delete = self.wallet.can_delete_address()
          selected = self.selected_in_column(self.Columns.ADDRESS)
          if not selected:
              return
          multi_select = len(selected) > 1
          addrs = [self.model().itemFromIndex(item).text() for item in selected]
          menu = QMenu()
          if not multi_select:
              idx = self.indexAt(position)
              if not idx.isValid():
                  return
              col = idx.column()
              item = self.model().itemFromIndex(idx)
              if not item:
                  return
              addr = addrs[0]
  
              addr_column_title = self.model().horizontalHeaderItem(self.Columns.LABEL).text()
              addr_idx = idx.sibling(idx.row(), self.Columns.LABEL)
  
              column_title = self.model().horizontalHeaderItem(col).text()
              copy_text = self.model().itemFromIndex(idx).text()
              if col == self.Columns.COIN_BALANCE or col == self.Columns.FIAT_BALANCE:
                  copy_text = copy_text.strip()
              menu.addAction(_("Copy {}").format(column_title), lambda: self.place_text_on_clipboard(copy_text))
              menu.addAction(_('Details'), lambda: self.parent.show_address(addr))
              persistent = QPersistentModelIndex(addr_idx)
              menu.addAction(_("Edit {}").format(addr_column_title), lambda p=persistent: self.edit(QModelIndex(p)))
              menu.addAction(_("Request payment"), lambda: self.parent.receive_at(addr))
              if self.wallet.can_export():
                  menu.addAction(_("Private key"), lambda: self.parent.show_private_key(addr))
              if not is_multisig and not self.wallet.is_watching_only():
                  menu.addAction(_("Sign/verify message"), lambda: self.parent.sign_verify_message(addr))
                  menu.addAction(_("Encrypt/decrypt message"), lambda: self.parent.encrypt_message(addr))
              if can_delete:
                  menu.addAction(_("Remove from wallet"), lambda: self.parent.remove_address(addr))
              addr_URL = block_explorer_URL(self.config, 'addr', addr)
              if addr_URL:
                  menu.addAction(_("View on block explorer"), lambda: webbrowser.open(addr_URL))
  
              if not self.wallet.is_frozen_address(addr):
                  menu.addAction(_("Freeze"), lambda: self.parent.set_frozen_state_of_addresses([addr], True))
              else:
                  menu.addAction(_("Unfreeze"), lambda: self.parent.set_frozen_state_of_addresses([addr], False))
  
          coins = self.wallet.get_spendable_coins(addrs, config=self.config)
          if coins:
              menu.addAction(_("Spend from"), lambda: self.parent.spend_coins(coins))
  
          run_hook('receive_menu', menu, addrs, self.wallet)
          menu.exec_(self.viewport().mapToGlobal(position))
  
      def place_text_on_clipboard(self, text):
          if is_address(text):
              try:
                  self.wallet.check_address(text)
              except InternalAddressCorruption as e:
                  self.parent.show_error(str(e))
                  raise
          self.parent.app.clipboard().setText(text)
  