Color-Code Addresses in Kivy UI (#5774)

* Added static coloring of the TX output dialog.

Coloring was suggested in #5750

electrum/gui/kivy/main.kv

@@ -67,6 +67,17 @@
             size_hint_x: None
             size: '30dp', '30dp'
 
+            
+<BackgroundColor@Widget>
+    background_color: 0, 0, 0, 1
+    canvas.before:
+        Color:
+            rgba: root.background_color
+        Rectangle:
+            size: self.size
+            pos: self.pos
+<BackgroundTopLabel@TopLabel+BackgroundColor>
+    background_color: 0, 0, 0, 1
 
 
 #########################
@@ -88,11 +99,15 @@
 <OutputItem>
     address: ''
     value: ''
+    background_color: 0, 0, 0, 1
+    color: 1, 1, 1, 1
     size_hint_y: None
     height: max(lbl1.height, lbl2.height)
-    TopLabel
+    BackgroundTopLabel
         id: lbl1
         text: '[ref=%s]%s[/ref]'%(root.address, root.address)
+        color: root.color
+        background_color: root.background_color 
         font_size: '6pt'
         shorten: True
         size_hint_x: 0.65

electrum/gui/kivy/uix/dialogs/tx_dialog.py

@@ -10,6 +10,7 @@ from kivy.clock import Clock
 from kivy.uix.label import Label
 from kivy.uix.dropdown import DropDown
 from kivy.uix.button import Button
+from kivy.utils import get_color_from_hex
 
 from .question import Question
 from electrum.gui.kivy.i18n import _
@@ -181,6 +182,31 @@ class TxDialog(Factory.Popup):
             self.fee_str = _('unknown')
             self.feerate_str = _('unknown')
         self.ids.output_list.update(self.tx.outputs())
+
+        def text_format(addr):
+            """
+            Chooses the appropriate text color and background color to 
+            mark receiving, change and billing addresses.
+
+            Returns: color, background_color
+            """
+            
+            # modified colors (textcolor, background_color) from electrum/gui/qt/util.py
+            GREEN = ("#000000", "#8af296")
+            YELLOW = ("#000000", "#ffff00")
+            BLUE = ("#000000", "#8cb3f2")
+            DEFAULT = ('#ffffff', '#4c4c4c')
+
+            colors = DEFAULT
+            if self.wallet.is_mine(addr):
+                colors = YELLOW if self.wallet.is_change(addr) else GREEN
+            elif self.wallet.is_billing_address(addr):
+                colors = BLUE
+            return (get_color_from_hex(color) for color in colors)
+
+        for dict_entry in self.ids.output_list.data:
+            dict_entry['color'], dict_entry['background_color'] = text_format(dict_entry['address'])
+
         self.is_local_tx = tx_mined_status.height == TX_HEIGHT_LOCAL
         self.update_action_button()