Adds close button to BIP78 receiver dialog

Prior to this commit, the cancel button remained
activated when the BIP78 payjoin processing had
completed, either successfully or unsuccessfully
which could be confusing for the user.
After this commit, when the processing is complete,
the JMBIP78ReceiverManager object fires the shutdown
callback, which Qt uses to signal the dialog, which
then updates to disable the Cancel button and show
the Close button.
Additionally, line breaks were added to make tooltips
more readable.

jmclient/jmclient/payjoin.py

@@ -1043,7 +1043,8 @@ class JMBIP78ReceiverManager(object):
     """ A class to encapsulate receiver construction
     """
     def __init__(self, wallet_service, mixdepth, amount, port,
-                 info_callback=None, uri_created_callback = None,
+                 info_callback=None, uri_created_callback=None,
+                 shutdown_callback=None,
                  mode="command-line"):
         assert isinstance(wallet_service, WalletService)
         assert isinstance(mixdepth, int)
@@ -1068,6 +1069,9 @@ class JMBIP78ReceiverManager(object):
             self.uri_created_callback = self.info_callback
         else:
             self.uri_created_callback = uri_created_callback
+        # This callback used by GUI as a signal that it can
+        # signal the user that the dialog is close-able:
+        self.shutdown_callback = shutdown_callback
         self.receiving_address = None
         self.mode = mode
 
@@ -1157,4 +1161,6 @@ class JMBIP78ReceiverManager(object):
     def shutdown(self):
         self.tor_connection.protocol.transport.loseConnection()
         process_shutdown(self.mode)
-        self.info_callback("Hidden service shutdown complete")
+        self.info_callback("Hidden service shutdown complete")
+        if self.shutdown_callback:
+            self.shutdown_callback()

scripts/joinmarket-qt.py

@@ -1571,6 +1571,7 @@ class JMMainWindow(QMainWindow):
         self.backend_receiver = JMBIP78ReceiverManager(self.wallet_service,
             mixdepth, amount, 80, self.receiver_bip78_dialog.info_update,
             uri_created_callback=self.receiver_bip78_dialog.update_uri,
+            shutdown_callback=self.receiver_bip78_dialog.process_complete,
             mode="gui")
         self.backend_receiver.start_pj_server_and_tor()
         return True

scripts/qtsupport.py

@@ -948,8 +948,8 @@ class ReceiveBIP78Dialog(QDialog):
     parameter_names = ['Amount to receive', 'Mixdepth']
     parameter_tooltips = [
      "How much you should receive (after any fees) in BTC or sats.",
-     "The mixdepth you source coins from to create inputs for the "
+     "The mixdepth you source coins from to create inputs for the\n"
-     "payjoin. Note your receiving address will be chosen from the "
+     "payjoin. Note your receiving address will be chosen from the\n"
      "*next* mixdepth after this (or 0 if last)."]
     parameter_types = ["btc", int]
     parameter_settings = ["", 0]
@@ -1007,6 +1007,16 @@ class ReceiveBIP78Dialog(QDialog):
         self.cancel_fn()
         self.close()
 
+    def process_complete(self):
+        """ Called by the owning Qt object
+        when the BIP78 workflow is complete,
+        whether successful or not.
+        """
+        # Give user indication that they
+        # can quit without cancelling:
+        self.close_btn.setVisible(True)
+        self.btnbox.button(QDialogButtonBox.Cancel).setDisabled(True)
+
     def start_generate(self):
         """ Before starting up the
         hidden service and initiating the payment
@@ -1015,9 +1025,9 @@ class ReceiveBIP78Dialog(QDialog):
         If the 'start generate request' action is
         aborted, we reset the generate button.
         """
-        self.btnbox.buttons()[1].setDisabled(True)
+        self.generate_btn.setDisabled(True)
         if not self.action_fn():
-            self.btnbox.buttons()[1].setDisabled(False)
+            self.generate_btn.setDisabled(False)
 
     def get_receive_bip78_dialog(self):
         """ Displays editable parameters and
@@ -1062,12 +1072,20 @@ class ReceiveBIP78Dialog(QDialog):
         layout.addWidget(self.updates_label, i+2, 0, 1, 2)
         layout.addWidget(self.bip21_widget, i+3, 0, 1, 2)
 
-        # Buttons for start/cancel:
+        # Buttons for start/cancel/close:
         self.btnbox = QDialogButtonBox()
         self.btnbox.setStandardButtons(QDialogButtonBox.Cancel)
-        btnname = "Generate request"
+        self.generate_btn = self.btnbox.addButton("&Generate request",
-        self.btnbox.addButton(btnname, QDialogButtonBox.ActionRole)
+                                                  QDialogButtonBox.ActionRole)
+        self.close_btn = self.btnbox.addButton("C&lose",
+                                               QDialogButtonBox.AcceptRole)
+        self.close_btn.setVisible(False)
         layout.addWidget(self.btnbox, i+4, 0)
+        # note that we don't use a standard 'Close' button because
+        # it is also associated with 'rejection' (and we don't use "OK" because
+        # concept doesn't quite fit here:
         self.btnbox.rejected.connect(self.shutdown_actions)
-        self.btnbox.buttons()[1].clicked.connect(self.start_generate)
+        self.generate_btn.clicked.connect(self.start_generate)
+        # does not trigger cancel_fn callback:
+        self.close_btn.clicked.connect(self.close)
         return layout