text: from qtum_electrum.i18n import _
  from qtum_electrum.plugin import run_hook
  from PyQt5.QtGui import *
  from PyQt5.QtCore import *
  from PyQt5.QtWidgets import QFileDialog
  
  from .util import ButtonsTextEdit, MessageBoxMixin
  
  
  class ShowQRTextEdit(ButtonsTextEdit):
  
      def __init__(self, text=None):
          ButtonsTextEdit.__init__(self, text)
          self.setReadOnly(1)
          self.addButton("qrcode.png", self.qr_show, _("Show as QR code"))
  
          run_hook('show_text_edit', self)
  
      def qr_show(self):
          from .qrcodewidget import QRDialog
          try:
              s = str(self.toPlainText())
          except:
              s = self.toPlainText()
          QRDialog(s).exec_()
  
      def contextMenuEvent(self, e):
          m = self.createStandardContextMenu()
          m.addAction(_("Show as QR code"), self.qr_show)
          m.exec_(e.globalPos())
  
  
  class ScanQRTextEdit(ButtonsTextEdit, MessageBoxMixin):
  
      def __init__(self, text="", allow_multi=False):
          ButtonsTextEdit.__init__(self, text)
          self.allow_multi = allow_multi
          self.setReadOnly(0)
          self.addButton("file.png", self.file_input, _("Read file"))
          icon = "qrcode.png"
          self.addButton(icon, self.qr_input, _("Read QR code"))
          run_hook('scan_text_edit', self)
  
      def file_input(self):
          fileName, __ = QFileDialog.getOpenFileName(self, 'select file')
          if not fileName:
              return
          try:
              with open(fileName, "r") as f:
                  data = f.read()
          except BaseException as e:
              self.show_error(_('Error opening file') + ':\n' + str(e))
          else:
              self.setText(data)
  
      def qr_input(self):
          from qtum_electrum import qrscanner, get_config
          try:
              data = qrscanner.scan_barcode(get_config().get_video_device())
          except BaseException as e:
              self.show_error(str(e))
              data = ''
          if not data:
              data = ''
          if self.allow_multi:
              new_text = self.text() + data + '\n'
          else:
              new_text = data
          self.setText(new_text)
          return data
  
      def contextMenuEvent(self, e):
          m = self.createStandardContextMenu()
          m.addAction(_("Read QR code"), self.qr_input)
          m.exec_(e.globalPos())
  