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 enum import IntEnum
  
  from PyQt5.QtGui import QStandardItemModel, QStandardItem
  from PyQt5.QtWidgets import QMenu
  from PyQt5.QtCore import Qt
  
  from electrum_axe.i18n import _
  from electrum_axe.util import format_time, age
  from electrum_axe.plugin import run_hook
  from electrum_axe.paymentrequest import PR_UNKNOWN
  from electrum_axe.wallet import InternalAddressCorruption
  
  from .util import MyTreeView, pr_tooltips, pr_icons, read_QIcon
  
  
  class RequestList(MyTreeView):
  
      class Columns(IntEnum):
          DATE = 0
          ADDRESS = 1
          SIGNATURE = 2
          DESCRIPTION = 3
          AMOUNT = 4
          STATUS = 5
  
      headers = {
          Columns.DATE: _('Date'),
          Columns.ADDRESS: _('Address'),
          Columns.SIGNATURE: '',
          Columns.DESCRIPTION: _('Description'),
          Columns.AMOUNT: _('Amount'),
          Columns.STATUS: _('Status'),
      }
      filter_columns = [Columns.DATE, Columns.ADDRESS, Columns.SIGNATURE, Columns.DESCRIPTION, Columns.AMOUNT]
  
      def __init__(self, parent):
          super().__init__(parent, self.create_menu,
                           stretch_column=self.Columns.DESCRIPTION,
                           editable_columns=[])
          self.setModel(QStandardItemModel(self))
          self.setSortingEnabled(True)
          self.setColumnWidth(self.Columns.DATE, 180)
          self.update()
          self.selectionModel().currentRowChanged.connect(self.item_changed)
  
      def item_changed(self, idx):
          # TODO use siblingAtColumn when min Qt version is >=5.11
          addr = self.model().itemFromIndex(idx.sibling(idx.row(), self.Columns.ADDRESS)).text()
          req = self.wallet.receive_requests.get(addr)
          if req is None:
              self.update()
              return
          expires = age(req['time'] + req['exp']) if req.get('exp') else _('Never')
          amount = req['amount']
          message = req['memo']
          self.parent.receive_address_e.setText(addr)
          self.parent.receive_message_e.setText(message)
          self.parent.receive_amount_e.setAmount(amount)
          self.parent.expires_combo.hide()
          self.parent.expires_label.show()
          self.parent.expires_label.setText(expires)
          self.parent.new_request_button.setEnabled(True)
  
      def update(self):
          self.wallet = self.parent.wallet
          # hide receive tab if no receive requests available
          if self.parent.isVisible():
              b = len(self.wallet.receive_requests) > 0
              self.setVisible(b)
              self.parent.receive_requests_label.setVisible(b)
              if not b:
                  self.parent.expires_label.hide()
                  self.parent.expires_combo.show()
  
          # update the receive address if necessary
          current_address = self.parent.receive_address_e.text()
          domain = self.wallet.get_receiving_addresses()
          try:
              addr = self.wallet.get_unused_address()
          except InternalAddressCorruption as e:
              self.parent.show_error(str(e))
              addr = ''
          if current_address not in domain and addr:
              self.parent.set_receive_address(addr)
          self.parent.new_request_button.setEnabled(addr != current_address)
          self.parent.update_receive_address_styling()
  
          self.model().clear()
          self.update_headers(self.__class__.headers)
          self.hideColumn(self.Columns.ADDRESS)
          for req in self.wallet.get_sorted_requests(self.config):
              address = req['address']
              if address not in domain:
                  continue
              timestamp = req.get('time', 0)
              amount = req.get('amount')
              expiration = req.get('exp', None)
              message = req['memo']
              date = format_time(timestamp)
              status = req.get('status')
              signature = req.get('sig')
              requestor = req.get('name', '')
              amount_str = self.parent.format_amount(amount) if amount else ""
              labels = [date, address, '', message, amount_str, pr_tooltips.get(status,'')]
              items = [QStandardItem(e) for e in labels]
              self.set_editability(items)
              if signature is not None:
                  items[self.Columns.SIGNATURE].setIcon(read_QIcon("seal.png"))
                  items[self.Columns.SIGNATURE].setToolTip(f'signed by {requestor}')
              if status is not PR_UNKNOWN:
                  items[self.Columns.STATUS].setIcon(read_QIcon(pr_icons.get(status)))
              items[self.Columns.DESCRIPTION].setData(address, Qt.UserRole)
              self.model().insertRow(self.model().rowCount(), items)
          self.filter()
  
      def create_menu(self, position):
          idx = self.indexAt(position)
          item = self.model().itemFromIndex(idx)
          # TODO use siblingAtColumn when min Qt version is >=5.11
          item_addr = self.model().itemFromIndex(idx.sibling(idx.row(), self.Columns.ADDRESS))
          if not item_addr:
              return
          addr = item_addr.text()
          req = self.wallet.receive_requests.get(addr)
          if req is None:
              self.update()
              return
          column = idx.column()
          column_title = self.model().horizontalHeaderItem(column).text()
          column_data = item.text()
          menu = QMenu(self)
          if column != self.Columns.SIGNATURE:
              if column == self.Columns.AMOUNT:
                  column_data = column_data.strip()
              menu.addAction(_("Copy {}").format(column_title), lambda: self.parent.app.clipboard().setText(column_data))
          menu.addAction(_("Copy URI"), lambda: self.parent.view_and_paste('URI', '', self.parent.get_request_URI(addr)))
          menu.addAction(_("Save as BIP70 file"), lambda: self.parent.export_payment_request(addr))
          menu.addAction(_("Delete"), lambda: self.parent.delete_payment_request(addr))
          run_hook('receive_list_menu', menu, addr)
          menu.exec_(self.viewport().mapToGlobal(position))
  