kivy: move amount dialog

gui/kivy/main_window.py

@@ -733,26 +733,17 @@ class ElectrumWindow(App):
 
 
     def amount_dialog(self, screen, show_max):
-        popup = Builder.load_file('gui/kivy/uix/ui_screens/amount.kv')
-        but_max = popup.ids.but_max
-        if not show_max:
-            but_max.disabled = True
-            but_max.opacity = 0
-        else:
-            but_max.disabled = False
-            but_max.opacity = 1
-
+        from uix.dialogs.amount_dialog import AmountDialog
         amount = screen.amount
         if amount:
-            a, u = str(amount).split()
+            amount, u = str(amount).split()
             assert u == self.base_unit
-            popup.ids.kb.amount = a
+        else:
+            amount = None
 
-        def cb():
-            o = popup.ids.a.btc_text
-            screen.amount = o
-
-        popup.on_dismiss = cb
+        def cb(amount):
+            screen.amount = amount
+        popup = AmountDialog(show_max, amount, cb)
         popup.open()
 
     def protected(self, f, args):

gui/kivy/uix/dialogs/amount_dialog.py

@@ -1,13 +1,15 @@
-#:import Decimal decimal.Decimal
+from kivy.app import App
+from kivy.factory import Factory
+from kivy.properties import ObjectProperty
+from kivy.lang import Builder
 
 
-Popup:
+Builder.load_string('''
+<AmountDialog@Popup>
     id: popup
     title: _('Amount')
-
     AnchorLayout:
         anchor_x: 'center'
-
         BoxLayout:
             orientation: 'vertical'
             size_hint: 0.8, 1
@@ -60,6 +62,8 @@ Popup:
                     text: '<'
                 Button:
                     id: but_max
+                    opacity: 1 if root.show_max else 0
+                    disabled: not root.show_max
                     size_hint: 1, None
                     height: '48dp'
                     text: 'Max'
@@ -80,10 +84,8 @@ Popup:
                     on_release:
                         kb.amount = ''
                         kb.fiat_amount = ''
-
             Widget:
                 size_hint: 1, None
-
             BoxLayout:
                 size_hint: 1, None
                 height: '48dp'
@@ -94,4 +96,19 @@ Popup:
                     size_hint: 1, None
                     height: '48dp'
                     text: _('OK')
-                    on_release: popup.dismiss()
+                    on_release:
+                        root.callback(a.btc_text)
+                        popup.dismiss()
+''')
+
+from kivy.properties import BooleanProperty
+
+class AmountDialog(Factory.Popup):
+    show_max = BooleanProperty(False)
+    def __init__(self, show_max, amount, cb):
+        Factory.Popup.__init__(self)
+        self.show_max = show_max
+        self.callback = cb
+        if amount:
+            self.ids.kb.amount = amount
+