refactor(core): put property key+value on the same screen

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

@@ -15,7 +15,7 @@ if False:
     from ..common.text import TextContent
 
 
-_PAGINATED_LINE_WIDTH = const(204)
+PAGINATED_LINE_WIDTH = const(204)
 
 WAS_PAGED = object()
 
@@ -283,7 +283,7 @@ def paginate_text(
     else:
         pages: list[ui.Component] = []
         span.reset(
-            text, 0, font, break_words=break_words, line_width=_PAGINATED_LINE_WIDTH
+            text, 0, font, break_words=break_words, line_width=PAGINATED_LINE_WIDTH
         )
         while span.has_more_content():
             # advance to first line of the page
@@ -295,7 +295,7 @@ def paginate_text(
                 new_lines=False,
                 content_offset=0,
                 char_offset=span.start,
-                line_width=_PAGINATED_LINE_WIDTH,
+                line_width=PAGINATED_LINE_WIDTH,
                 break_words=break_words,
                 render_page_overflow=False,
             )
@@ -310,6 +310,9 @@ def paginate_text(
         return Paginated(pages)
 
 
+PAGEBREAK = 0, ""
+
+
 def paginate_paragraphs(
     para: Iterable[tuple[int, str]],
     header: str,
@@ -321,15 +324,16 @@ def paginate_paragraphs(
     span = Span("", 0, ui.NORMAL, break_words=break_words)
     lines = 0
     content: list[TextContent] = []
-    for font, text in para:
-        span.reset(text, 0, font, break_words=break_words)
+    for item in para:
+        if item is PAGEBREAK:
+            continue
+        span.reset(item[1], 0, item[0], break_words=break_words)
         lines += span.count_lines()
 
         # we'll need this for multipage too
         if content:
             content.append("\n")
-        content.append(font)
-        content.append(text)
+        content.extend(item)
 
     if lines <= TEXT_MAX_LINES:
         result = Text(
@@ -339,19 +343,27 @@ def paginate_paragraphs(
             new_lines=False,
             break_words=break_words,
         )
-        for font, text in para:
-            if len(result.content) != 0:
-                result.content.append("\n")
-            result.content.append(font)
-            result.content.append(text)
+        result.content = content
         return confirm(result)
 
     else:
         pages: list[ui.Component] = []
         lines_left = 0
-        for i, (font, text) in enumerate(para):
+        content_ctr = 0
+        page: Text | None = None
+        for item in para:
+            if item is PAGEBREAK:
+                if page is not None:
+                    page.max_lines -= lines_left
+                lines_left = 0
+                continue
+
             span.reset(
-                text, 0, font, break_words=break_words, line_width=_PAGINATED_LINE_WIDTH
+                item[1],
+                0,
+                item[0],
+                break_words=break_words,
+                line_width=PAGINATED_LINE_WIDTH,
             )
 
             while span.has_more_content():
@@ -362,9 +374,9 @@ def paginate_paragraphs(
                         header_icon=header_icon,
                         icon_color=icon_color,
                         new_lines=False,
-                        content_offset=i * 3 + 1,  # font, _text_, newline
+                        content_offset=content_ctr * 3 + 1,  # font, _text_, newline
                         char_offset=span.start,
-                        line_width=_PAGINATED_LINE_WIDTH,
+                        line_width=PAGINATED_LINE_WIDTH,
                         render_page_overflow=False,
                         break_words=break_words,
                     )
@@ -374,5 +386,7 @@ def paginate_paragraphs(
                 else:
                     lines_left -= 1
 
+            content_ctr += 1
+
         pages[-1] = confirm(pages[-1])
         return Paginated(pages)

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

@@ -11,7 +11,7 @@ from ..components.common import break_path_to_lines
 from ..components.common.confirm import is_confirmed, raise_if_cancelled
 from ..components.tt.button import ButtonCancel, ButtonDefault
 from ..components.tt.confirm import Confirm, HoldToConfirm
-from ..components.tt.scroll import Paginated, paginate_paragraphs, paginate_text
+from ..components.tt.scroll import Paginated, paginate_paragraphs, paginate_text, PAGINATED_LINE_WIDTH, PAGEBREAK
 from ..components.tt.text import Span, Text
 from ..constants.tt import (
     MONO_ADDR_PER_LINE,
@@ -577,6 +577,9 @@ async def confirm_hex(
     await raise_if_cancelled(interact(ctx, content, br_type, br_code))
 
 
+_SCREEN_FULL_THRESHOLD = const(2)
+
+
 # TODO keep name and value on the same page if possible
 async def confirm_properties(
     ctx: wire.GenericContext,
@@ -588,12 +591,44 @@ async def confirm_properties(
     hold: bool = False,
     br_code: ButtonRequestType = ButtonRequestType.ConfirmOutput,
 ) -> None:
+    span = Span()
     para = []
-    for p in props:
-        if p[0] is not None:
-            para.append((ui.NORMAL, p[0]))
-        if p[1] is not None:
-            para.append((ui.BOLD, p[1]))
+    used_lines = 0
+    for key, val in props:
+        span.reset(key or "", 0, ui.NORMAL, line_width=PAGINATED_LINE_WIDTH)
+        key_lines = span.count_lines()
+        span.reset(val or "", 0, ui.BOLD, line_width=PAGINATED_LINE_WIDTH)
+        val_lines = span.count_lines()
+
+        remaining_lines = TEXT_MAX_LINES - used_lines
+        used_lines = (used_lines + key_lines + val_lines) % TEXT_MAX_LINES
+
+        if key_lines + val_lines > remaining_lines:
+            if remaining_lines <= _SCREEN_FULL_THRESHOLD:
+                # there are only 2 remaining lines, don't try to fit and put everything
+                # on next page
+                para.append(PAGEBREAK)
+                used_lines = (key_lines + val_lines) % TEXT_MAX_LINES
+
+            elif val_lines > 0 and key_lines >= remaining_lines:
+                # more than 2 remaining lines so try to fit something -- but won't fit
+                # at least one line of value
+                para.append(PAGEBREAK)
+                used_lines = (key_lines + val_lines) % TEXT_MAX_LINES
+
+            elif key_lines + val_lines <= TEXT_MAX_LINES:
+                # Whole property won't fit to the page, but it will fit on a page
+                # by itself
+                para.append(PAGEBREAK)
+                used_lines = (key_lines + val_lines) % TEXT_MAX_LINES
+
+            # else:
+            # None of the above. Continue fitting on the same page.
+
+        if key:
+            para.append((ui.NORMAL, key))
+        if val:
+            para.append((ui.BOLD, val))
     content = paginate_paragraphs(
         para, title, icon, icon_color, confirm=HoldToConfirm if hold else Confirm
     )