kivy: remove loading_image in qrcodewidget (too slow)

gui/kivy/uix/qrcodewidget.py

@@ -18,7 +18,7 @@ from kivy.clock import Clock
 
 Builder.load_string('''
 <QRCodeWidget>
-    on_parent: if args[1]: qrimage.source = self.loading_image
+    #on_parent: if args[1]: qrimage.source = self.loading_image
     canvas.before:
         # Draw white Rectangle
         Color:
@@ -61,7 +61,7 @@ class QRCodeWidget(FloatLayout):
     defaulting to `(1, 1, 1, 1)`.
     '''
 
-    loading_image = StringProperty('gui/kivy/theming/loading.gif')
+    #loading_image = StringProperty('gui/kivy/theming/loading.gif')
 
     def __init__(self, **kwargs):
         super(QRCodeWidget, self).__init__(**kwargs)

gui/kivy/uix/screens.py

@@ -216,29 +216,27 @@ class SendScreen(CScreen):
             app.show_error(_('Invalid Fee'))
             return
 
-        message = 'sending {} {} to {}'.format(app.base_unit, scrn.amount_e.text, r)
-
+        message = 'sending {} {} to {}'.format(self.app.base_unit, scrn.amount_e.text, r)
         # assume no password and fee is None
         password = None
         fee = None
-        #self.send_tx([('address', to_address, amount)], fee, label, password)
+        self.send_tx([('address', to_address, amount)], fee, label, password)
 
     def send_tx(self, outputs, fee, label, password):
-        app = App.get_running_app()
         # make unsigned transaction
-        coins = self.wallet.get_spendable_coins()
+        coins = self.app.wallet.get_spendable_coins()
         try:
-            tx = self.wallet.make_unsigned_transaction(coins, outputs, self.electrum_config, fee)
+            tx = self.app.wallet.make_unsigned_transaction(coins, outputs, self.electrum_config, fee)
         except Exception as e:
             traceback.print_exc(file=sys.stdout)
-            app.show_error(str(e))
+            self.app.show_error(str(e))
             return
         # sign transaction
         try:
-            self.wallet.sign_transaction(tx, password)
+            self.app.wallet.sign_transaction(tx, password)
         except Exception as e:
             traceback.print_exc(file=sys.stdout)
-            app.show_error(str(e))
+            self.app.show_error(str(e))
             return
         # broadcast
         self.wallet.sendtx(tx)
@@ -247,6 +245,7 @@ class SendScreen(CScreen):
 
 class ReceiveScreen(CScreen):
     kvname = 'receive'
+    @profiler
     def update(self):
         addr = self.app.wallet.get_unused_address(None)
         qr = self.screen.ids.get('qr')