apps.wallet: add qr code to get_address

TODO: the widget system clearly needs some work

src/apps/wallet/get_address.py

@@ -29,12 +29,14 @@ async def layout_get_address(session_id, msg):
 async def _show_address(session_id, address):
     from trezor.messages.ButtonRequestType import Address
     from trezor.ui.text import Text
+    from trezor.ui.qr import Qr
+    from trezor.ui.container import Container
     from ..common.confirm import require_confirm
 
-    # TODO: qr code
-
-    content = Text('Confirm address', ui.ICON_RESET,
-                   ui.MONO, *_split_address(address))
+    lines = _split_address(address)
+    content = Container(
+        Qr(address, (76, 90), 3),
+        Text('Confirm address', ui.ICON_RESET, ui.MONO, *lines))
     await require_confirm(session_id, content, code=Address)
 
 

src/trezor/ui/container.py

@@ -0,0 +1,15 @@
+
+class Container:
+
+    def __init__(self, *children):
+        self.children = children
+
+    def render(self):
+        for child in self.children:
+            child.render()
+
+    def send(self, event, pos):
+        for child in self.children:
+            result = child.send(event, pos)
+            if result is not None:
+                return result

src/trezor/ui/qr.py

@@ -0,0 +1,15 @@
+from trezor import ui
+
+
+class Qr:
+
+    def __init__(self, data, pos, scale):
+        self.data = data
+        self.pos = pos
+        self.scale = scale
+
+    def render(self):
+        ui.display.qrcode(self.pos[0], self.pos[1], self.data, self.scale)
+
+    def send(self, event, pos):
+        pass