kivy: use Clock to improve button responsiveness

gui/kivy/main.kv

@@ -3,6 +3,8 @@
 #:import _ electrum.i18n._
 
 # Custom Global Widgets
+<Button>
+    on_parent: self.MIN_STATE_TIME = 0.1
 
 <VGridLayout@GridLayout>:
     rows: 1
@@ -219,6 +221,12 @@
     height: '40dp'
     text_color: self.foreground_color
     foreground_color: 1, 0, 0, 1
+    canvas.before:
+        Color:
+            rgba: (0.9, .498, 0.745, 1) if self.state == 'down' else self.background_color
+        Rectangle:
+            size: self.size
+            pos: self.pos
 
 
 <TextInputBlue@TextInput>
@@ -251,12 +259,12 @@
     carousel: carousel
     do_default_tab: False
     Carousel:
-        scroll_timeout: 190
+        scroll_timeout: 250
+        scroll_distance: '20dp'
         anim_type: 'out_quart'
         min_move: .05
         anim_move_duration: .1
         anim_cancel_duration: .54
-        scroll_distance: '10dp'
         on_index: root.on_index(*args)
         id: carousel
 

gui/kivy/main_window.py

@@ -731,16 +731,13 @@ class ElectrumWindow(App):
         d = LabelDialog(_('Enter description'), text, callback)
         d.open()
 
-
+    @profiler
     def amount_dialog(self, screen, show_max):
         from uix.dialogs.amount_dialog import AmountDialog
         amount = screen.amount
         if amount:
             amount, u = str(amount).split()
             assert u == self.base_unit
-        else:
-            amount = None
-
         def cb(amount):
             screen.amount = amount
         popup = AmountDialog(show_max, amount, cb)

gui/kivy/uix/context_menu.py

@@ -6,6 +6,7 @@ from kivy.animation import Animation
 from kivy.uix.floatlayout import FloatLayout
 from kivy.lang import Builder
 from kivy.factory import Factory
+from kivy.clock import Clock
 
 Builder.load_string('''
 <MenuItem@Button>
@@ -33,6 +34,7 @@ class MenuItem(Factory.Button):
     pass
 
 class ContextMenu(Bubble):
+
     def __init__(self, obj, action_list):
         Bubble.__init__(self)
         self.obj = obj
@@ -40,7 +42,11 @@ class ContextMenu(Bubble):
             l = MenuItem()
             l.text = k
             def func(f=v):
-                f(obj)
-                if self.parent: self.parent.hide_menu()
+                Clock.schedule_once(lambda dt: self.hide(), 0.1)
+                Clock.schedule_once(lambda dt: f(obj), 0.15)
             l.on_release = func
             self.ids.buttons.add_widget(l)
+
+    def hide(self):
+        if self.parent:
+            self.parent.hide_menu()

gui/kivy/uix/screens.py

@@ -225,6 +225,9 @@ class SendScreen(CScreen):
         self.screen.address = ''
         self.payment_request = None
 
+    def amount_dialog(self):
+        Clock.schedule_once(lambda dt: self.app.amount_dialog(self, True), .25)
+
     def set_request(self, pr):
         self.payment_request = pr
         self.screen.address = pr.get_requestor()

gui/kivy/uix/ui_screens/send.kv

@@ -53,7 +53,7 @@ SendScreen:
                     id: amount_e
                     default_text: _('Amount')
                     text: s.amount if s.amount else _('Amount')
-                    on_release: app.amount_dialog(s, True)
+                    on_release: s.amount_dialog()
             CardSeparator:
                 opacity: message_selection.opacity
                 color: blue_bottom.foreground_color