Kivy: Lightning support in Receive tab

.gitignore

@@ -19,8 +19,12 @@ bin/
 # icons
 electrum/gui/qt/icons_rc.py
 electrum/gui/kivy/theming/light-0.png
+electrum/gui/kivy/theming/light-1.png
 electrum/gui/kivy/theming/light.atlas
 electrum/gui/kivy/theming/light/network.png
+electrum/gui/kivy/theming/light/lightning_switch_off.png
+electrum/gui/kivy/theming/light/lightning_switch_on.png
+electrum/gui/kivy/theming/light/lightning.png
 
 # tests/tox
 .tox/

electrum/gui/kivy/Makefile

@@ -5,7 +5,9 @@ PYTHON = python3
 .PHONY: theming apk clean
 
 theming:
-	bash -c "convert -background none theming/light/network.{svg,png}"
+	bash -c 'for i in network lightning; do convert -background none theming/light/$$i.{svg,png}; done'
+	convert -background none -crop +0+390 theming/light/lightning_switch.svg theming/light/lightning_switch_off.png
+	convert -background none -crop 840x390+0+0 theming/light/lightning_switch.svg theming/light/lightning_switch_on.png
 	$(PYTHON) -m kivy.atlas theming/light 1024 theming/light/*.png
 prepare:
 	# running pre build setup

electrum/gui/kivy/main_window.py

@@ -959,6 +959,15 @@ class ElectrumWindow(App):
         popup = AmountDialog(show_max, amount, cb)
         popup.open()
 
+    def lightning_invoices_dialog(self, cb):
+        from .uix.dialogs.lightning_invoices import LightningInvoicesDialog
+        report = self.wallet.lnworker._list_invoices()
+        if not report['unsettled']:
+            self.show_info(_('No unsettled invoices. Type in an amount to generate a new one.'))
+            return
+        popup = LightningInvoicesDialog(report, cb)
+        popup.open()
+
     def invoices_dialog(self, screen):
         from .uix.dialogs.invoices import InvoicesDialog
         if len(self.wallet.invoices.sorted_list()) == 0:

electrum/gui/kivy/theming/light/lightning.svg

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="210.01" height="258.6" version="1.1" viewBox="0 0 55.564 68.421" xmlns="http://www.w3.org/2000/svg">
+ <g transform="translate(-37.066 -74.368)">
+  <path d="m38.127 110.58 40.719-34.163c1.8833-1.4037 4.6684-4.2048 2.3466 0.82819l-13.527 25.467 23.12 0.34508c1.0576 0.11762 2.8154-0.14879 1.1733 1.4493l-40.582 35.474c-2.6048 2.0742-6.2555 5.6722-2.6916-1.2423l13.251-25.398-22.913-0.55213c-2.1564 0.0996-2.6432-0.5521-0.8972-2.2085z" fill="#fff" fill-rule="evenodd" stroke-width=".13606"/>
+ </g>
+</svg>

electrum/gui/kivy/theming/light/lightning_switch.svg

@@ -0,0 +1,288 @@
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electrum/gui/kivy/uix/dialogs/lightning_invoices.py

@@ -0,0 +1,65 @@
+from kivy.factory import Factory
+from kivy.lang import Builder
+from electrum.gui.kivy.i18n import _
+from kivy.uix.recycleview import RecycleView
+from electrum.gui.kivy.uix.context_menu import ContextMenu
+
+Builder.load_string('''
+<Item@CardItem>
+    addr: ''
+    desc: ''
+    screen: None
+    BoxLayout:
+        orientation: 'vertical'
+        Label
+            text: root.addr
+            text_size: self.width, None
+            shorten: True
+        Label
+            text: root.desc if root.desc else _('No description')
+            text_size: self.width, None
+            shorten: True
+            font_size: '10dp'
+
+<LightningInvoicesDialog@Popup>
+    id: popup
+    title: _('Lightning Invoices')
+    BoxLayout:
+        orientation: 'vertical'
+        id: box
+        RecycleView:
+            viewclass: 'Item'
+            id: recycleview
+            data: []
+            RecycleBoxLayout:
+                default_size: None, dp(56)
+                default_size_hint: 1, None
+                size_hint_y: None
+                height: self.minimum_height
+                orientation: 'vertical'
+''')
+
+class LightningInvoicesDialog(Factory.Popup):
+
+    def __init__(self, report, callback):
+        super().__init__()
+        self.context_menu = None
+        self.callback = callback
+        self.menu_actions = [(_('Show'), self.do_show)]
+        for addr, preimage, pay_req in report['unsettled']:
+            self.ids.recycleview.data.append({'screen': self, 'addr': pay_req, 'desc': dict(addr.tags).get('d', '')})
+
+    def do_show(self, obj):
+        self.hide_menu()
+        self.dismiss()
+        self.callback(obj.addr)
+
+    def show_menu(self, obj):
+        self.hide_menu()
+        self.context_menu = ContextMenu(obj, self.menu_actions)
+        self.ids.box.add_widget(self.context_menu)
+
+    def hide_menu(self):
+        if self.context_menu is not None:
+            self.ids.box.remove_widget(self.context_menu)
+            self.context_menu = None

electrum/gui/kivy/uix/screens.py

@@ -15,6 +15,8 @@ from kivy.properties import (ObjectProperty, DictProperty, NumericProperty,
 
 from kivy.uix.recycleview import RecycleView
 from kivy.uix.label import Label
+from kivy.uix.behaviors import ToggleButtonBehavior
+from kivy.uix.image import Image
 
 from kivy.lang import Builder
 from kivy.factory import Factory
@@ -385,6 +387,7 @@ class ReceiveScreen(CScreen):
         self.screen.address = ''
         self.screen.amount = ''
         self.screen.message = ''
+        self.screen.lnaddr = ''
 
     def get_new_address(self):
         if not self.app.wallet:
@@ -421,18 +424,30 @@ class ReceiveScreen(CScreen):
 
     @profiler
     def update_qr(self):
-        uri = self.get_URI()
         qr = self.screen.ids.qr
-        qr.set_data(uri)
+        if self.screen.ids.lnbutton.state == 'down':
+            qr.set_data(self.screen.lnaddr)
+        else:
+            uri = self.get_URI()
+            qr.set_data(uri)
 
     def do_share(self):
-        uri = self.get_URI()
+        if self.screen.ids.lnbutton.state == 'down':
-        self.app.do_share(uri, _("Share Bitcoin Request"))
+            if self.screen.lnaddr:
+                self.app.do_share('lightning://' + self.lnaddr, _('Share Lightning invoice'))
+        else:
+            uri = self.get_URI()
+            self.app.do_share(uri, _("Share Bitcoin Request"))
 
     def do_copy(self):
-        uri = self.get_URI()
+        if self.screen.ids.lnbutton.state == 'down':
-        self.app._clipboard.copy(uri)
+            if self.screen.lnaddr:
-        self.app.show_info(_('Request copied to clipboard'))
+                self.app._clipboard.copy(self.screen.lnaddr)
+                self.app.show_info(_('Invoice copied to clipboard'))
+        else:
+            uri = self.get_URI()
+            self.app._clipboard.copy(uri)
+            self.app.show_info(_('Request copied to clipboard'))
 
     def save_request(self):
         addr = self.screen.address
@@ -453,6 +468,9 @@ class ReceiveScreen(CScreen):
         return added_request
 
     def on_amount_or_message(self):
+        if self.screen.ids.lnbutton.state == 'down':
+            if self.screen.amount:
+                self.screen.lnaddr = self.app.wallet.lnworker.add_invoice(self.app.get_amount(self.screen.amount), self.screen.message)
         Clock.schedule_once(lambda dt: self.update_qr())
 
     def do_new(self):
@@ -464,6 +482,13 @@ class ReceiveScreen(CScreen):
         if self.save_request():
             self.app.show_info(_('Request was saved.'))
 
+    def do_open_lnaddr(self, lnaddr):
+        self.clear()
+        self.screen.lnaddr = lnaddr
+        obj = lndecode(lnaddr, expected_hrp=constants.net.SEGWIT_HRP)
+        self.screen.message = dict(obj.tags).get('d', '')
+        self.screen.amount = self.app.format_amount_and_units(int(obj.amount * bitcoin.COIN))
+        self.on_amount_or_message()
 
 class TabbedCarousel(Factory.TabbedPanel):
     '''Custom TabbedPanel using a carousel used in the Main Screen
@@ -537,3 +562,15 @@ class TabbedCarousel(Factory.TabbedPanel):
             self.carousel.add_widget(widget)
             return
         super(TabbedCarousel, self).add_widget(widget, index=index)
+
+class LightningButton(ToggleButtonBehavior, Image):
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
+        self.source = 'atlas://electrum/gui/kivy/theming/light/lightning_switch_off'
+
+    def on_state(self, widget, value):
+        self.state = value
+        if value == 'down':
+            self.source = 'atlas://electrum/gui/kivy/theming/light/lightning_switch_on'
+        else:
+            self.source = 'atlas://electrum/gui/kivy/theming/light/lightning_switch_off'

electrum/gui/kivy/uix/ui_screens/receive.kv

@@ -14,6 +14,7 @@ ReceiveScreen:
     amount: ''
     message: ''
     status: ''
+    lnaddr: ''
 
     on_address:
         self.parent.on_address(self.address)
@@ -30,6 +31,7 @@ ReceiveScreen:
         FloatLayout:
             id: bl
             QRCodeWidget:
+                opacity: 0 if lnbutton.state == 'down' and not s.lnaddr else 1
                 id: qr
                 size_hint: None, 1
                 width: min(self.height, bl.width)
@@ -62,15 +64,15 @@ ReceiveScreen:
                 height: blue_bottom.item_height
                 spacing: '5dp'
                 Image:
-                    source: 'atlas://electrum/gui/kivy/theming/light/globe'
+                    source: 'atlas://electrum/gui/kivy/theming/light/lightning' if lnbutton.state == 'down' else 'atlas://electrum/gui/kivy/theming/light/globe'
                     size_hint: None, None
                     size: '22dp', '22dp'
                     pos_hint: {'center_y': .5}
                 BlueButton:
                     id: address_label
-                    text: s.address if s.address else _('Bitcoin Address')
+                    text: (s.address if s.address else _('Bitcoin Address')) if lnbutton.state != 'down' else (s.lnaddr if s.lnaddr else _('Please enter amount'))
                     shorten: True
-                    on_release: Clock.schedule_once(lambda dt: app.addresses_dialog(s))
+                    on_release: Clock.schedule_once(lambda dt: app.addresses_dialog(s) if lnbutton.state != 'down' else s.parent.do_copy())
             CardSeparator:
                 opacity: message_selection.opacity
                 color: blue_bottom.foreground_color
@@ -111,15 +113,17 @@ ReceiveScreen:
             size_hint: 1, None
             height: '48dp'
             IconButton:
-                icon: 'atlas://electrum/gui/kivy/theming/light/save'
+                opacity: 1 if lnbutton.state != 'down' else 0
-                size_hint: 0.6, None
+                icon: 'atlas://electrum/gui/kivy/theming/light/save' if lnbutton.state != 'down' else ''
+                size_hint: (0 if lnbutton.state == 'down' else 0.6), None
                 height: '48dp'
-                on_release: s.parent.do_save()
+                on_release: s.parent.do_save() if lnbutton.state != 'down' else None
+                width: (0 if lnbutton.state == 'down' else 100)
             Button:
-                text: _('Requests')
+                text: _('Requests') if lnbutton.state != 'down' else _('Lightning Invoices')
-                size_hint: 1, None
+                size_hint: 1 + (.6 if lnbutton.state == 'down' else 0), None
                 height: '48dp'
-                on_release: Clock.schedule_once(lambda dt: app.requests_dialog(s))
+                on_release: Clock.schedule_once(lambda dt: app.requests_dialog(s) if lnbutton.state != 'down' else app.lightning_invoices_dialog(s.parent.do_open_lnaddr))
             Button:
                 text: _('Copy')
                 size_hint: 1, None
@@ -133,8 +137,11 @@ ReceiveScreen:
         BoxLayout:
             size_hint: 1, None
             height: '48dp'
+            LightningButton
+                id: lnbutton
+                on_state: s.parent.on_amount_or_message()
             Widget
-                size_hint: 2, 1
+                size_hint: 1, 1
             Button:
                 text: _('New')
                 size_hint: 1, None

electrum/lnworker.py

@@ -115,7 +115,8 @@ class LNWorker(PrintError):
         if report['unsettled']:
             yield 'Your unsettled invoices:'
             yield '------------------------'
-            for addr, preimage in report['unsettled']:
+            for addr, preimage, pay_req in report['unsettled']:
+                yield pay_req
                 yield str(addr)
                 yield 'Preimage: ' + bh2u(preimage)
                 yield ''
@@ -143,7 +144,7 @@ class LNWorker(PrintError):
             settled.append((datetime.fromtimestamp(date, timezone.utc), HTLCOwner(direction), htlcobj, preimage))
         for preimage, pay_req in invoices.values():
             addr = lndecode(pay_req, expected_hrp=constants.net.SEGWIT_HRP)
-            unsettled.append((addr, bfh(preimage)))
+            unsettled.append((addr, bfh(preimage), pay_req))
         for pay_req, amount_sat in self.paying.values():
             addr = lndecode(pay_req, expected_hrp=constants.net.SEGWIT_HRP)
             if amount_sat is not None: