feat(core/ui): allow text without header

core/src/trezor/ui/components/common/text.py

@@ -9,6 +9,7 @@ from ...constants import (
     TEXT_LINE_HEIGHT_HALF,
     TEXT_MARGIN_LEFT,
     TEXT_MAX_LINES,
+    TEXT_MAX_LINES_NO_HEADER,
 )
 
 LINE_WIDTH = ui.WIDTH - TEXT_MARGIN_LEFT
@@ -232,7 +233,7 @@ def render_text(
     """
     # initial rendering state
     INITIAL_OFFSET_X = offset_x
-    offset_y_max = TEXT_HEADER_HEIGHT + (TEXT_LINE_HEIGHT * max_lines)
+    offset_y_max = offset_y + (TEXT_LINE_HEIGHT * (max_lines - 1))
     span = _WORKING_SPAN
 
     # scan through up to item_offset so that the current font & color is up to date
@@ -364,10 +365,10 @@ if __debug__:
 class TextBase(ui.Component):
     def __init__(
         self,
-        header_text: str,
+        header_text: str | None,
         header_icon: str = ui.ICON_DEFAULT,
         icon_color: int = ui.ORANGE_ICON,
-        max_lines: int = TEXT_MAX_LINES,
+        max_lines: int | None = None,
         new_lines: bool = True,
         break_words: bool = False,
         render_page_overflow: bool = True,
@@ -379,7 +380,14 @@ class TextBase(ui.Component):
         self.header_text = header_text
         self.header_icon = header_icon
         self.icon_color = icon_color
-        self.max_lines = max_lines
+
+        if max_lines is None:
+            self.max_lines = (
+                TEXT_MAX_LINES_NO_HEADER if self.header_text is None else TEXT_MAX_LINES
+            )
+        else:
+            self.max_lines = max_lines
+
         self.new_lines = new_lines
         self.break_words = break_words
         self.render_page_overflow = render_page_overflow
@@ -436,7 +444,7 @@ class TextBase(ui.Component):
                     self.on_render()
             finally:
                 self.repaint = should_repaint
-            return [self.header_text] + display_mock.screen_contents
+            return [self.header_text or ""] + display_mock.screen_contents
 
 
 LABEL_LEFT = const(0)

core/src/trezor/ui/components/tt/scroll.py

@@ -7,7 +7,13 @@ from trezor.messages import ButtonAck, ButtonRequest
 from .button import Button, ButtonCancel, ButtonConfirm, ButtonDefault
 from .confirm import CANCELLED, CONFIRMED, Confirm
 from .swipe import SWIPE_DOWN, SWIPE_UP, SWIPE_VERTICAL, Swipe
-from .text import LINE_WIDTH_PAGINATED, TEXT_MAX_LINES, Span, Text
+from .text import (
+    LINE_WIDTH_PAGINATED,
+    TEXT_MAX_LINES,
+    TEXT_MAX_LINES_NO_HEADER,
+    Span,
+    Text,
+)
 
 if False:
     from typing import Callable, Iterable
@@ -310,7 +316,7 @@ PAGEBREAK = 0, ""
 
 def paginate_paragraphs(
     para: Iterable[tuple[int, str]],
-    header: str,
+    header: str | None,
     header_icon: str = ui.ICON_DEFAULT,
     icon_color: int = ui.ORANGE_ICON,
     break_words: bool = False,
@@ -319,6 +325,7 @@ def paginate_paragraphs(
     span = Span("", 0, ui.NORMAL, break_words=break_words)
     lines = 0
     content: list[TextContent] = []
+    max_lines = TEXT_MAX_LINES_NO_HEADER if header is None else TEXT_MAX_LINES
     for item in para:
         if item is PAGEBREAK:
             continue
@@ -330,7 +337,7 @@ def paginate_paragraphs(
             content.append("\n")
         content.extend(item)
 
-    if lines <= TEXT_MAX_LINES:
+    if lines <= max_lines:
         result = Text(
             header,
             header_icon=header_icon,
@@ -377,7 +384,7 @@ def paginate_paragraphs(
                     )
                     page.content = content
                     pages.append(page)
-                    lines_left = TEXT_MAX_LINES - 1
+                    lines_left = max_lines - 1
                 else:
                     lines_left -= 1
 

core/src/trezor/ui/components/tt/text.py

@@ -8,7 +8,10 @@ from ..common.text import (  # noqa: F401
     BR_HALF,
     LINE_WIDTH,
     LINE_WIDTH_PAGINATED,
+    TEXT_HEADER_HEIGHT,
+    TEXT_LINE_HEIGHT,
     TEXT_MAX_LINES,
+    TEXT_MAX_LINES_NO_HEADER,
     Span,
     TextBase,
     render_text,
@@ -30,13 +33,16 @@ def header(
 class Text(TextBase):
     def on_render(self) -> None:
         if self.repaint:
-            header(
-                self.header_text,
-                self.header_icon,
-                ui.TITLE_GREY,
-                ui.BG,
-                self.icon_color,
-            )
+            offset_y = TEXT_LINE_HEIGHT
+            if self.header_text is not None:
+                header(
+                    self.header_text,
+                    self.header_icon,
+                    ui.TITLE_GREY,
+                    ui.BG,
+                    self.icon_color,
+                )
+                offset_y = TEXT_HEADER_HEIGHT + TEXT_LINE_HEIGHT
             render_text(
                 self.content,
                 self.new_lines,
@@ -46,6 +52,7 @@ class Text(TextBase):
                 break_words=self.break_words,
                 line_width=self.line_width,
                 render_page_overflow=self.render_page_overflow,
+                offset_y=offset_y,
             )
             self.repaint = False
 

core/src/trezor/ui/constants/t1.py

@@ -5,3 +5,4 @@ TEXT_LINE_HEIGHT = const(9)
 TEXT_LINE_HEIGHT_HALF = const(4)
 TEXT_MARGIN_LEFT = const(0)
 TEXT_MAX_LINES = const(4)
+TEXT_MAX_LINES_NO_HEADER = const(5)

core/src/trezor/ui/constants/tt.py

@@ -5,6 +5,7 @@ TEXT_LINE_HEIGHT = const(26)
 TEXT_LINE_HEIGHT_HALF = const(13)
 TEXT_MARGIN_LEFT = const(14)
 TEXT_MAX_LINES = const(5)
+TEXT_MAX_LINES_NO_HEADER = const(7)
 PAGINATION_MARGIN_RIGHT = const(22)
 
 MONO_ADDR_PER_LINE = const(17)