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 typing import Optional, TYPE_CHECKING
  
  from PyQt5.QtGui import QStandardItemModel, QStandardItem
  from PyQt5.QtWidgets import QMenu, QAbstractItemView
  from PyQt5.QtCore import Qt, QItemSelectionModel, QModelIndex
  
  from electrum_spero.i18n import _
  from electrum_spero.util import format_time
  from electrum_spero.invoices import PR_TYPE_ONCHAIN, PR_TYPE_LN, LNInvoice, OnchainInvoice
  from electrum_spero.plugin import run_hook
  from electrum_spero.invoices import Invoice
  
  from .util import MyTreeView, pr_icons, read_QIcon, webopen, MySortModel
  
  if TYPE_CHECKING:
      from .main_window import ElectrumWindow
  
  
  ROLE_REQUEST_TYPE = Qt.UserRole
  ROLE_KEY = Qt.UserRole + 1
  ROLE_SORT_ORDER = Qt.UserRole + 2
  
  
  class RequestList(MyTreeView):
  
      class Columns(IntEnum):
          DATE = 0
          DESCRIPTION = 1
          AMOUNT = 2
          STATUS = 3
  
      headers = {
          Columns.DATE: _('Date'),
          Columns.DESCRIPTION: _('Description'),
          Columns.AMOUNT: _('Amount'),
          Columns.STATUS: _('Status'),
      }
      filter_columns = [Columns.DATE, Columns.DESCRIPTION, Columns.AMOUNT]
  
      def __init__(self, parent: 'ElectrumWindow'):
          super().__init__(parent, self.create_menu,
                           stretch_column=self.Columns.DESCRIPTION)
          self.wallet = self.parent.wallet
          self.std_model = QStandardItemModel(self)
          self.proxy = MySortModel(self, sort_role=ROLE_SORT_ORDER)
          self.proxy.setSourceModel(self.std_model)
          self.setModel(self.proxy)
          self.setSortingEnabled(True)
          self.selectionModel().currentRowChanged.connect(self.item_changed)
          self.setSelectionMode(QAbstractItemView.ExtendedSelection)
          self.update()
  
      def select_key(self, key):
          for i in range(self.model().rowCount()):
              item = self.model().index(i, self.Columns.DATE)
              row_key = item.data(ROLE_KEY)
              if key == row_key:
                  self.selectionModel().setCurrentIndex(item, QItemSelectionModel.SelectCurrent | QItemSelectionModel.Rows)
                  break
  
      def item_changed(self, idx: Optional[QModelIndex]):
          if idx is None:
              self.parent.receive_payreq_e.setText('')
              self.parent.receive_address_e.setText('')
              return
          if not idx.isValid():
              return
          # TODO use siblingAtColumn when min Qt version is >=5.11
          item = self.item_from_index(idx.sibling(idx.row(), self.Columns.DATE))
          key = item.data(ROLE_KEY)
          req = self.wallet.get_request(key)
          if req is None:
              self.update()
              return
          if req.is_lightning():
              self.parent.receive_payreq_e.setText(req.invoice)  # TODO maybe prepend "lightning:" ??
              self.parent.receive_address_e.setText(req.invoice)
          else:
              self.parent.receive_payreq_e.setText(self.parent.wallet.get_request_URI(req))
              self.parent.receive_address_e.setText(req.get_address())
          self.parent.receive_payreq_e.repaint()  # macOS hack (similar to #4777)
          self.parent.receive_address_e.repaint()  # macOS hack (similar to #4777)
  
      def clearSelection(self):
          super().clearSelection()
          self.selectionModel().clearCurrentIndex()
  
      def refresh_status(self):
          m = self.std_model
          for r in range(m.rowCount()):
              idx = m.index(r, self.Columns.STATUS)
              date_idx = idx.sibling(idx.row(), self.Columns.DATE)
              date_item = m.itemFromIndex(date_idx)
              status_item = m.itemFromIndex(idx)
              key = date_item.data(ROLE_KEY)
              req = self.wallet.get_request(key)
              if req:
                  status = self.parent.wallet.get_request_status(key)
                  status_str = req.get_status_str(status)
                  status_item.setText(status_str)
                  status_item.setIcon(read_QIcon(pr_icons.get(status)))
  
      def update_item(self, key, invoice: Invoice):
          model = self.std_model
          for row in range(0, model.rowCount()):
              item = model.item(row, 0)
              if item.data(ROLE_KEY) == key:
                  break
          else:
              return
          status_item = model.item(row, self.Columns.STATUS)
          status = self.parent.wallet.get_request_status(key)
          status_str = invoice.get_status_str(status)
          status_item.setText(status_str)
          status_item.setIcon(read_QIcon(pr_icons.get(status)))
  
      def update(self):
          # not calling maybe_defer_update() as it interferes with conditional-visibility
          self.parent.update_receive_address_styling()
          self.proxy.setDynamicSortFilter(False)  # temp. disable re-sorting after every change
          self.std_model.clear()
          self.update_headers(self.__class__.headers)
          for req in self.wallet.get_unpaid_requests():
              key = self.wallet.get_key_for_receive_request(req)
              status = self.parent.wallet.get_request_status(key)
              status_str = req.get_status_str(status)
              request_type = req.type
              timestamp = req.time
              amount = req.get_amount_sat()
              message = req.message
              date = format_time(timestamp)
              amount_str = self.parent.format_amount(amount) if amount else ""
              labels = [date, message, amount_str, status_str]
              if req.is_lightning():
                  icon = read_QIcon("lightning.png")
                  tooltip = 'lightning request'
              else:
                  icon = read_QIcon("bitcoin.png")
                  tooltip = 'onchain request'
              items = [QStandardItem(e) for e in labels]
              self.set_editability(items)
              items[self.Columns.DATE].setData(request_type, ROLE_REQUEST_TYPE)
              items[self.Columns.DATE].setData(key, ROLE_KEY)
              items[self.Columns.DATE].setData(timestamp, ROLE_SORT_ORDER)
              items[self.Columns.DATE].setIcon(icon)
              items[self.Columns.STATUS].setIcon(read_QIcon(pr_icons.get(status)))
              items[self.Columns.DATE].setToolTip(tooltip)
              self.std_model.insertRow(self.std_model.rowCount(), items)
          self.filter()
          self.proxy.setDynamicSortFilter(True)
          # sort requests by date
          self.sortByColumn(self.Columns.DATE, Qt.DescendingOrder)
          # hide list if empty
          if self.parent.isVisible():
              b = self.std_model.rowCount() > 0
              self.setVisible(b)
              self.parent.receive_requests_label.setVisible(b)
              if not b:
                  # list got hidden, so selected item should also be cleared:
                  self.item_changed(None)
  
      def create_menu(self, position):
          items = self.selected_in_column(0)
          if len(items)>1:
              keys = [item.data(ROLE_KEY)  for item in items]
              menu = QMenu(self)
              menu.addAction(_("Delete requests"), lambda: self.parent.delete_requests(keys))
              menu.exec_(self.viewport().mapToGlobal(position))
              return
          idx = self.indexAt(position)
          # TODO use siblingAtColumn when min Qt version is >=5.11
          item = self.item_from_index(idx.sibling(idx.row(), self.Columns.DATE))
          if not item:
              return
          key = item.data(ROLE_KEY)
          req = self.wallet.get_request(key)
          if req is None:
              self.update()
              return
          menu = QMenu(self)
          self.add_copy_menu(menu, idx)
          if req.is_lightning():
              menu.addAction(_("Copy Request"), lambda: self.parent.do_copy(req.invoice, title='Lightning Request'))
          else:
              URI = self.wallet.get_request_URI(req)
              menu.addAction(_("Copy Request"), lambda: self.parent.do_copy(URI, title='SperoCoin URI'))
              menu.addAction(_("Copy Address"), lambda: self.parent.do_copy(req.get_address(), title='SperoCoin Address'))
          #if 'view_url' in req:
          #    menu.addAction(_("View in web browser"), lambda: webopen(req['view_url']))
          menu.addAction(_("Delete"), lambda: self.parent.delete_requests([key]))
          run_hook('receive_list_menu', self.parent, menu, key)
          menu.exec_(self.viewport().mapToGlobal(position))
  