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.
  from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from __future__ import unicode_literals
  
  import six
  
  import webbrowser
  
  from .util import *
  from electrum.i18n import _
  from electrum.util import block_explorer_URL, format_satoshis, format_time
  from electrum.plugins import run_hook
  from electrum.bitcoin import is_address
  
  
  class AddressList(MyTreeWidget):
      filter_columns = [0, 1, 2]  # Address, Label, Balance
  
      def __init__(self, parent=None):
          MyTreeWidget.__init__(self, parent, self.create_menu, [ _('Address'), _('Label'), _('Balance'), _('Tx')], 1)
          self.setSelectionMode(QAbstractItemView.ExtendedSelection)
  
      def on_update(self):
          self.wallet = self.parent.wallet
          item = self.currentItem()
          current_address = item.data(0, Qt.UserRole) if item else None
          self.clear()
          receiving_addresses = self.wallet.get_receiving_addresses()
          change_addresses = self.wallet.get_change_addresses()
          if True:
              account_item = self
              sequences = [0,1] if change_addresses else [0]
              for is_change in sequences:
                  if len(sequences) > 1:
                      name = _("Receiving") if not is_change else _("Change")
                      seq_item = QTreeWidgetItem( [ name, '', '', '', ''] )
                      account_item.addChild(seq_item)
                      if not is_change:
                          seq_item.setExpanded(True)
                  else:
                      seq_item = account_item
                  used_item = QTreeWidgetItem( [ _("Used"), '', '', '', ''] )
                  used_flag = False
                  addr_list = change_addresses if is_change else receiving_addresses
                  for address in addr_list:
                      num = len(self.wallet.history.get(address,[]))
                      is_used = self.wallet.is_used(address)
                      label = self.wallet.labels.get(address,'')
                      c, u, x = self.wallet.get_addr_balance(address)
                      balance = self.parent.format_amount(c + u + x)
                      address_item = QTreeWidgetItem([address, label, balance, "%d"%num])
                      address_item.setFont(0, QFont(MONOSPACE_FONT))
                      address_item.setData(0, Qt.UserRole, address)
                      address_item.setData(0, Qt.UserRole+1, True) # label can be edited
                      if self.wallet.is_frozen(address):
                          address_item.setBackgroundColor(0, QColor('lightblue'))
                      if self.wallet.is_beyond_limit(address, is_change):
                          address_item.setBackgroundColor(0, QColor('red'))
                      if is_used:
                          if not used_flag:
                              seq_item.insertChild(0, used_item)
                              used_flag = True
                          used_item.addChild(address_item)
                      else:
                          seq_item.addChild(address_item)
                      if address == current_address:
                          self.setCurrentItem(address_item)
  
      def create_menu(self, position):
          from electrum.wallet import Multisig_Wallet
          is_multisig = isinstance(self.wallet, Multisig_Wallet)
          can_delete = self.wallet.can_delete_address()
          selected = self.selectedItems()
          multi_select = len(selected) > 1
          addrs = [item.text(0) for item in selected]
          if not addrs:
              return
          if not multi_select:
              item = self.itemAt(position)
              col = self.currentColumn()
              if not item:
                  return
              addr = addrs[0]
              if not is_address(addr):
                  item.setExpanded(not item.isExpanded())
                  return
  
          menu = QMenu()
          if not multi_select:
              column_title = self.headerItem().text(col)
              menu.addAction(_("Copy %s")%column_title, lambda: self.parent.app.clipboard().setText(item.text(col)))
              menu.addAction(_('Details'), lambda: self.parent.show_address(addr))
              if col in self.editable_columns:
                  menu.addAction(_("Edit %s")%column_title, lambda: self.editItem(item, col))
              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(addr):
                  menu.addAction(_("Freeze"), lambda: self.parent.set_frozen_state([addr], True))
              else:
                  menu.addAction(_("Unfreeze"), lambda: self.parent.set_frozen_state([addr], False))
  
          coins = self.wallet.get_utxos(addrs)
          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))
  
  