lightning: march 2018 rebase, without integration

gui/kivy/uix/dialogs/lightning_channels.py

@@ -0,0 +1,49 @@
+from kivy.lang import Builder
+from kivy.factory import Factory
+
+Builder.load_string('''
+<LightningChannelItem@CardItem>
+    channelId: '<channelId not set>'
+    Label:
+        text: root.channelId
+
+<LightningChannelsDialog@Popup>:
+    name: 'lightning_channels'
+    BoxLayout:
+        orientation: 'vertical'
+        spacing: '1dp'
+        ScrollView:
+            GridLayout:
+                cols: 1
+                id: lightning_channels_container
+                size_hint: 1, None
+                height: self.minimum_height
+                spacing: '2dp'
+                padding: '12dp'
+''')
+
+class LightningChannelsDialog(Factory.Popup):
+    def __init__(self, app):
+        super(LightningChannelsDialog, self).__init__()
+        self.clocks = []
+        self.app = app
+    def open(self, *args, **kwargs):
+        super(LightningChannelsDialog, self).open(*args, **kwargs)
+        for i in self.clocks: i.cancel()
+        self.clocks.append(Clock.schedule_interval(self.fetch_channels, 10))
+        self.app.wallet.lightning.subscribe(self.rpc_result_handler)
+    def dismiss(self, *args, **kwargs):
+        super(LightningChannelsDialog, self).dismiss(*args, **kwargs)
+        self.app.wallet.lightning.clearSubscribers()
+    def fetch_channels(self, dw):
+        lightning.lightningCall(self.app.wallet.lightning, "listchannels")()
+    def rpc_result_handler(self, res):
+        if isinstance(res, Exception):
+            raise res
+        channel_cards = self.ids.lightning_channels_container
+        channels_cards.clear_widgets()
+        for i in res["channels"]:
+            item = Factory.LightningChannelItem()
+            item.screen = self
+            item.channelId = i.channelId
+            channel_cards.add_widget(item)