send_tab: add spinner for network lookup indication

electrum/gui/qt/send_tab.py

@@ -4,9 +4,10 @@
 
 from decimal import Decimal
 from typing import Optional, TYPE_CHECKING, Sequence, List, Callable
-from PyQt5.QtCore import pyqtSignal, QPoint
+from PyQt5.QtCore import pyqtSignal, QPoint, QSize, Qt
 from PyQt5.QtWidgets import (QLabel, QVBoxLayout, QGridLayout, QHBoxLayout,
                              QWidget, QToolTip, QPushButton, QApplication)
+from PyQt5.QtGui import QMovie, QColor
 
 from electrum.i18n import _
 from electrum.logging import Logger
@@ -22,7 +23,7 @@ from .amountedit import AmountEdit, BTCAmountEdit, SizedFreezableLineEdit
 from .paytoedit import InvalidPaymentIdentifier
 from .util import (WaitingDialog, HelpLabel, MessageBoxMixin, EnterButton,
                    char_width_in_lineedit, get_iconname_camera, get_iconname_qrcode,
-                   read_QIcon, ColorScheme)
+                   read_QIcon, ColorScheme, icon_path)
 from .confirm_tx_dialog import ConfirmTxDialog
 
 if TYPE_CHECKING:
@@ -127,6 +128,15 @@ class SendTab(QWidget, MessageBoxMixin, Logger):
         self.paste_button.setMaximumWidth(35)
         grid.addWidget(self.paste_button, 0, 5)
 
+        self.spinner = QMovie(icon_path('spinner.gif'))
+        self.spinner.setScaledSize(QSize(24, 24))
+        self.spinner.setBackgroundColor(QColor('black'))
+        self.spinner_l = QLabel()
+        self.spinner_l.setMargin(5)
+        self.spinner_l.setVisible(False)
+        self.spinner_l.setMovie(self.spinner)
+        grid.addWidget(self.spinner_l, 0, 1, 1, 4, Qt.AlignRight)
+
         self.save_button = EnterButton(_("Save"), self.do_save_invoice)
         self.save_button.setEnabled(False)
         self.send_button = EnterButton(_("Pay") + "...", self.do_pay_or_get_invoice)
@@ -185,6 +195,13 @@ class SendTab(QWidget, MessageBoxMixin, Logger):
         self.notify_merchant_done_signal.connect(self.on_notify_merchant_done)
         self.payto_e.paymentIdentifierChanged.connect(self._handle_payment_identifier)
 
+    def showSpinner(self, b):
+        self.spinner_l.setVisible(b)
+        if b:
+            self.spinner.start()
+        else:
+            self.spinner.stop()
+
     def on_amount_changed(self, text):
         # FIXME: implement full valid amount check to enable/disable Pay button
         pi_valid = self.payto_e.payment_identifier.is_valid() if self.payto_e.payment_identifier else False
@@ -325,12 +342,9 @@ class SendTab(QWidget, MessageBoxMixin, Logger):
         run_hook('do_clear', self)
 
     def prepare_for_send_tab_network_lookup(self):
-        self.window.show_send_tab() # FIXME why is this here
-        #for e in [self.payto_e, self.message_e]:
-        # self.payto_e.setFrozen(True)
         for btn in [self.save_button, self.send_button, self.clear_button]:
             btn.setEnabled(False)
-        # self.payto_e.setTextNoCheck(_("please wait..."))
+        self.showSpinner(True)
 
     def payment_request_error(self, error):
         self.show_message(error)
@@ -430,6 +444,7 @@ class SendTab(QWidget, MessageBoxMixin, Logger):
         # TODO: resolve can happen while typing, we don't want message dialogs to pop up
         # currently we don't set error for emaillike recipients to avoid just that
         self.logger.debug('payment identifier resolve done')
+        self.showSpinner(False)
         if pi.error:
             self.show_error(pi.error)
             self.do_clear()
@@ -481,6 +496,7 @@ class SendTab(QWidget, MessageBoxMixin, Logger):
         return self.amount_e.get_amount() or 0
 
     def on_finalize_done(self, pi):
+        self.showSpinner(False)
         self.update_fields()
         if pi.error:
             self.show_error(pi.error)