simplify the Text interface

src/apps/management/layout_wipe_device.py

@@ -12,10 +12,8 @@ async def layout_wipe_device(message, session_id):
     ui.clear()
 
     content = Text('Wiping device',
-                   (ui.BOLD, 'Do you really want to'),
-                   (ui.BOLD, 'wipe the device?'),
-                   (ui.NORMAL, ''),
-                   (ui.NORMAL, 'All data will be lost.'))
+                   ui.BOLD, 'Do you really want to', 'wipe the device?',
+                   ui.NORMAL, '', 'All data will be lost.')
     await hold_to_confirm(session_id, content)
 
     clear_storage(session_id)

src/trezor/ui/text.py

@@ -7,19 +7,23 @@ TEXT_MARGIN_LEFT = const(10)
 
 class Text:
 
-    def __init__(self, header, *lines):
+    def __init__(self, header, *content):
         self.header = header
-        self.lines = lines
+        self.content = content
 
     def render(self):
         offset = TEXT_LINE_HEIGHT
         ui.display.text(TEXT_MARGIN_LEFT, offset,
                         self.header, ui.BOLD, ui.LIGHT_GREEN, ui.BLACK)
         offset += TEXT_HEADER_HEIGHT
-        for style, line in self.lines:
-            ui.display.text(TEXT_MARGIN_LEFT, offset,
-                            line, style, ui.WHITE, ui.BLACK)
-            offset += TEXT_LINE_HEIGHT
+        style = ui.NORMAL
+        for item in self.content:
+            if isinstance(item, str):
+                ui.display.text(TEXT_MARGIN_LEFT, offset,
+                                item, style, ui.WHITE, ui.BLACK)
+                offset += TEXT_LINE_HEIGHT
+            else:
+                style = item
 
     def send(self, event, pos):
         pass