kivy: receive_screen improvements

gui/kivy/uix/dialogs/question.py

@@ -0,0 +1,51 @@
+from kivy.app import App
+from kivy.factory import Factory
+from kivy.properties import ObjectProperty
+from kivy.lang import Builder
+from kivy.uix.checkbox import CheckBox
+from kivy.uix.label import Label
+from kivy.uix.widget import Widget
+
+from electrum_gui.kivy.i18n import _
+
+Builder.load_string('''
+<Question@Popup>
+    id: popup
+    title: ''
+    message: ''
+    size_hint: 0.8, 0.5
+    pos_hint: {'top':0.9}
+    BoxLayout:
+        orientation: 'vertical'
+        Label:
+            id: label
+            text: root.message
+        Widget:
+            size_hint: 1, 0.1
+        BoxLayout:
+            orientation: 'horizontal'
+            size_hint: 1, 0.2
+            Button:
+                text: _('No')
+                size_hint: 0.5, None
+                height: '48dp'
+                on_release:
+                    popup.dismiss()
+            Button:
+                text: _('Yes')
+                size_hint: 0.5, None
+                height: '48dp'
+                on_release:
+                    root.callback()
+                    popup.dismiss()
+''')
+
+
+
+class Question(Factory.Popup):
+
+    def __init__(self, msg, callback):
+        Factory.Popup.__init__(self)
+        self.title = _('Question')
+        self.message = msg
+        self.callback = callback