chore(core/rust): Add dynamic place system

core/embed/rust/src/lib.rs

@@ -15,9 +15,10 @@ mod trezorhal;
 
 #[cfg(feature = "ui")]
 #[macro_use]
-mod ui;
+pub mod ui;
 mod util;
 
+#[cfg(not(test))]
 #[cfg(not(feature = "test"))]
 #[panic_handler]
 fn panic(_info: &core::panic::PanicInfo) -> ! {

core/embed/rust/src/micropython/buffer.rs

@@ -22,6 +22,12 @@ pub struct Buffer {
     len: usize,
 }
 
+impl Buffer {
+    pub fn empty() -> Self {
+        Self::from("")
+    }
+}
+
 impl TryFrom<Obj> for Buffer {
     type Error = Error;
 
@@ -35,6 +41,12 @@ impl TryFrom<Obj> for Buffer {
     }
 }
 
+impl Default for Buffer {
+    fn default() -> Self {
+        Self::empty()
+    }
+}
+
 impl Deref for Buffer {
     type Target = [u8];
 

core/embed/rust/src/ui/component/base.rs

@@ -6,7 +6,10 @@ use heapless::Vec;
 use crate::ui::model_t1::event::ButtonEvent;
 #[cfg(feature = "model_tt")]
 use crate::ui::model_tt::event::TouchEvent;
-use crate::{time::Duration, ui::geometry::Rect};
+use crate::{
+    time::Duration,
+    ui::{component::Map, geometry::Rect},
+};
 
 /// Type used by components that do not return any messages.
 ///
@@ -14,12 +17,38 @@ use crate::{time::Duration, ui::geometry::Rect};
 pub enum Never {}
 
 /// User interface is composed of components that can react to `Event`s through
-/// the `event` method and know how to paint themselves to screen through the
+/// the `event` method, and know how to paint themselves to screen through the
 /// `paint` method.  Components can emit messages as a reaction to events.
 pub trait Component {
     type Msg;
+
+    /// Position the component into some available space, specified by `bounds`.
+    ///
+    /// Component should lay itself out, together with all children, and return
+    /// the total bounding box. This area can, occasionally, be larger than
+    /// `bounds` (it is a soft-limit), but the component **should never** paint
+    /// outside of it.
+    ///
+    /// No painting should be done in this phase.
+    fn place(&mut self, bounds: Rect) -> Rect;
+
+    /// React to an outside event. See the `Event` type for possible cases.
+    ///
+    /// Component should modify its internal state as a response to the event,
+    /// and usually call `EventCtx::request_paint` to mark itself for painting.
+    /// Component can also optionally return a message as a result of the
+    /// interaction.
+    ///
+    /// No painting should be done in this phase.
     fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg>;
+
+    /// Render to screen, based on current internal state.
+    ///
+    /// To prevent unnecessary over-draw, dirty state checking is performed in
+    /// the `Child` wrapper.
     fn paint(&mut self);
+
+    /// Report current paint bounds of this component. Used for debugging.
     fn bounds(&self, _sink: &mut dyn FnMut(Rect)) {}
 }
 
@@ -78,6 +107,10 @@ where
 {
     type Msg = T::Msg;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        self.component.place(bounds)
+    }
+
     fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
         self.mutate(ctx, |ctx, c| {
             // Handle the internal invalidation event here, so components don't have to. We
@@ -112,7 +145,47 @@ where
     }
 }
 
+impl<M, T, U> Component for (T, U)
+where
+    T: Component<Msg = M>,
+    U: Component<Msg = M>,
+{
+    type Msg = M;
+
+    fn place(&mut self, bounds: Rect) -> Rect {
+        self.0.place(bounds).union(self.1.place(bounds))
+    }
+
+    fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
+        self.0
+            .event(ctx, event)
+            .or_else(|| self.1.event(ctx, event))
+    }
+
+    fn paint(&mut self) {
+        self.0.paint();
+        self.1.paint();
+    }
+}
+
+#[cfg(feature = "ui_debug")]
+impl<T, U> crate::trace::Trace for (T, U)
+where
+    T: Component,
+    T: crate::trace::Trace,
+    U: Component,
+    U: crate::trace::Trace,
+{
+    fn trace(&self, d: &mut dyn crate::trace::Tracer) {
+        d.open("Tuple");
+        d.field("0", &self.0);
+        d.field("1", &self.1);
+        d.close();
+    }
+}
+
 pub trait ComponentExt: Sized {
+    fn map<F>(self, func: F) -> Map<Self, F>;
     fn into_child(self) -> Child<Self>;
     fn request_complete_repaint(&mut self, ctx: &mut EventCtx);
 }
@@ -121,6 +194,10 @@ impl<T> ComponentExt for T
 where
     T: Component,
 {
+    fn map<F>(self, func: F) -> Map<Self, F> {
+        Map::new(self, func)
+    }
+
     fn into_child(self) -> Child<Self> {
         Child::new(self)
     }
@@ -172,6 +249,7 @@ impl TimerToken {
 pub struct EventCtx {
     timers: Vec<(TimerToken, Duration), { Self::MAX_TIMERS }>,
     next_token: u32,
+    place_requested: bool,
     paint_requested: bool,
     anim_frame_scheduled: bool,
 }
@@ -194,11 +272,26 @@ impl EventCtx {
         Self {
             timers: Vec::new(),
             next_token: Self::STARTING_TIMER_TOKEN,
-            paint_requested: false,
+            place_requested: true, // We need to perform a place pass in the beginning.
+            paint_requested: false, /* We also need to paint, but this is supplemented by
+                                    * `Child::marked_for_paint` being true. */
             anim_frame_scheduled: false,
         }
     }
 
+    /// Indicate that position or sizes of components inside the component tree
+    /// have changed, and we should perform a place pass before next event or
+    /// paint traversals.
+    pub fn request_place(&mut self) {
+        self.place_requested = true;
+    }
+
+    /// Returns `true` if we should first perform a place traversal before
+    /// processing events or painting.
+    pub fn needs_place_before_next_event_or_paint(&self) -> bool {
+        self.place_requested
+    }
+
     /// Indicate that the inner state of the component has changed, any screen
     /// content it has painted before is now invalid, and it should be painted
     /// again by the nearest `Child` wrapper.
@@ -226,6 +319,7 @@ impl EventCtx {
     }
 
     pub fn clear(&mut self) {
+        self.place_requested = false;
         self.paint_requested = false;
         self.anim_frame_scheduled = false;
     }

core/embed/rust/src/ui/component/empty.rs

@@ -1,10 +1,15 @@
 use super::{Component, Event, EventCtx, Never};
+use crate::ui::geometry::Rect;
 
 pub struct Empty;
 
 impl Component for Empty {
     type Msg = Never;
 
+    fn place(&mut self, _bounds: Rect) -> Rect {
+        Rect::zero()
+    }
+
     fn event(&mut self, _ctx: &mut EventCtx, _event: Event) -> Option<Self::Msg> {
         None
     }

core/embed/rust/src/ui/component/label.rs

@@ -3,7 +3,7 @@ use core::ops::Deref;
 use crate::ui::{
     component::{Component, Event, EventCtx, Never},
     display::{self, Color, Font},
-    geometry::{Alignment, Point, Rect},
+    geometry::{Alignment, Offset, Rect},
 };
 
 pub struct LabelStyle {
@@ -14,6 +14,7 @@ pub struct LabelStyle {
 
 pub struct Label<T> {
     area: Rect,
+    align: Alignment,
     style: LabelStyle,
     text: T,
 }
@@ -22,45 +23,25 @@ impl<T> Label<T>
 where
     T: Deref<Target = [u8]>,
 {
-    pub fn new(origin: Point, align: Alignment, text: T, style: LabelStyle) -> Self {
-        let width = style.font.text_width(&text);
-        let height = style.font.line_height();
-        let area = match align {
-            // `origin` is the top-left point.
-            Alignment::Start => Rect {
-                x0: origin.x,
-                y0: origin.y,
-                x1: origin.x + width,
-                y1: origin.y + height,
-            },
-            // `origin` is the top-centered point.
-            Alignment::Center => Rect {
-                x0: origin.x - width / 2,
-                y0: origin.y,
-                x1: origin.x + width / 2,
-                y1: origin.y + height,
-            },
-            // `origin` is the top-right point.
-            Alignment::End => Rect {
-                x0: origin.x - width,
-                y0: origin.y,
-                x1: origin.x,
-                y1: origin.y + height,
-            },
-        };
-        Self { area, style, text }
+    pub fn new(text: T, align: Alignment, style: LabelStyle) -> Self {
+        Self {
+            area: Rect::zero(),
+            align,
+            style,
+            text,
+        }
     }
 
-    pub fn left_aligned(origin: Point, text: T, style: LabelStyle) -> Self {
-        Self::new(origin, Alignment::Start, text, style)
+    pub fn left_aligned(text: T, style: LabelStyle) -> Self {
+        Self::new(text, Alignment::Start, style)
     }
 
-    pub fn right_aligned(origin: Point, text: T, style: LabelStyle) -> Self {
-        Self::new(origin, Alignment::End, text, style)
+    pub fn right_aligned(text: T, style: LabelStyle) -> Self {
+        Self::new(text, Alignment::End, style)
     }
 
-    pub fn centered(origin: Point, text: T, style: LabelStyle) -> Self {
-        Self::new(origin, Alignment::Center, text, style)
+    pub fn centered(text: T, style: LabelStyle) -> Self {
+        Self::new(text, Alignment::Center, style)
     }
 
     pub fn text(&self) -> &T {
@@ -74,6 +55,35 @@ where
 {
     type Msg = Never;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        let size = Offset::new(
+            self.style.font.text_width(&self.text),
+            self.style.font.line_height(),
+        );
+        self.area = match self.align {
+            Alignment::Start => Rect::from_top_left_and_size(bounds.top_left(), size),
+            Alignment::Center => {
+                let origin = bounds.top_left().center(bounds.top_right());
+                Rect {
+                    x0: origin.x - size.x / 2,
+                    y0: origin.y,
+                    x1: origin.x + size.x / 2,
+                    y1: origin.y + size.y,
+                }
+            }
+            Alignment::End => {
+                let origin = bounds.top_right();
+                Rect {
+                    x0: origin.x - size.x,
+                    y0: origin.y,
+                    x1: origin.x,
+                    y1: origin.y + size.y,
+                }
+            }
+        };
+        self.area
+    }
+
     fn event(&mut self, _ctx: &mut EventCtx, _event: Event) -> Option<Self::Msg> {
         None
     }

core/embed/rust/src/ui/component/map.rs

@@ -19,6 +19,10 @@ where
 {
     type Msg = U;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        self.inner.place(bounds)
+    }
+
     fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
         self.inner.event(ctx, event).and_then(&self.func)
     }

core/embed/rust/src/ui/component/maybe.rs

@@ -19,12 +19,12 @@ impl<T> Maybe<T> {
         }
     }
 
-    pub fn visible(area: Rect, clear: Color, inner: T) -> Self {
-        Self::new(Pad::with_background(area, clear), inner, true)
+    pub fn visible(clear: Color, inner: T) -> Self {
+        Self::new(Pad::with_background(clear), inner, true)
     }
 
-    pub fn hidden(area: Rect, clear: Color, inner: T) -> Self {
-        Self::new(Pad::with_background(area, clear), inner, false)
+    pub fn hidden(clear: Color, inner: T) -> Self {
+        Self::new(Pad::with_background(clear), inner, false)
     }
 }
 
@@ -72,6 +72,12 @@ where
 {
     type Msg = T::Msg;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        let area = self.inner.place(bounds);
+        self.pad.place(area);
+        area
+    }
+
     fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
         if self.visible {
             self.inner.event(ctx, event)

core/embed/rust/src/ui/component/mod.rs

@@ -7,8 +7,9 @@ pub mod map;
 pub mod maybe;
 pub mod pad;
 pub mod paginated;
+pub mod painter;
+pub mod placed;
 pub mod text;
-pub mod tuple;
 
 pub use base::{Child, Component, ComponentExt, Event, EventCtx, Never, TimerToken};
 pub use empty::Empty;
@@ -17,6 +18,8 @@ pub use map::Map;
 pub use maybe::Maybe;
 pub use pad::Pad;
 pub use paginated::{PageMsg, Paginate};
+pub use painter::Painter;
+pub use placed::GridPlaced;
 pub use text::{
     formatted::FormattedText,
     layout::{LineBreaking, PageBreaking, TextLayout},

core/embed/rust/src/ui/component/pad.rs

@@ -10,14 +10,18 @@ pub struct Pad {
 }
 
 impl Pad {
-    pub fn with_background(area: Rect, color: Color) -> Self {
+    pub fn with_background(color: Color) -> Self {
         Self {
-            area,
             color,
+            area: Rect::zero(),
             clear: false,
         }
     }
 
+    pub fn place(&mut self, area: Rect) {
+        self.area = area;
+    }
+
     pub fn clear(&mut self) {
         self.clear = true;
     }

core/embed/rust/src/ui/component/painter.rs

@@ -0,0 +1,38 @@
+use crate::ui::{
+    component::{Component, Event, EventCtx, Never},
+    geometry::Rect,
+};
+
+pub struct Painter<F> {
+    area: Rect,
+    func: F,
+}
+
+impl<F> Painter<F> {
+    pub fn new(func: F) -> Self {
+        Self {
+            func,
+            area: Rect::zero(),
+        }
+    }
+}
+
+impl<F> Component for Painter<F>
+where
+    F: FnMut(Rect),
+{
+    type Msg = Never;
+
+    fn place(&mut self, bounds: Rect) -> Rect {
+        self.area = bounds;
+        self.area
+    }
+
+    fn event(&mut self, _ctx: &mut EventCtx, _event: Event) -> Option<Self::Msg> {
+        None
+    }
+
+    fn paint(&mut self) {
+        (self.func)(self.area);
+    }
+}

core/embed/rust/src/ui/component/placed.rs

@@ -0,0 +1,79 @@
+use crate::ui::{
+    component::{Component, Event, EventCtx},
+    geometry::{Grid, GridCellSpan, Rect},
+};
+
+pub struct GridPlaced<T> {
+    inner: T,
+    grid: Grid,
+    cells: GridCellSpan,
+}
+
+impl<T> GridPlaced<T> {
+    pub fn new(inner: T) -> Self {
+        Self {
+            inner,
+            grid: Grid::new(Rect::zero(), 0, 0),
+            cells: GridCellSpan {
+                from: (0, 0),
+                to: (0, 0),
+            },
+        }
+    }
+
+    pub fn with_grid(mut self, rows: usize, cols: usize) -> Self {
+        self.grid.rows = rows;
+        self.grid.cols = cols;
+        self
+    }
+
+    pub fn with_spacing(mut self, spacing: i32) -> Self {
+        self.grid.spacing = spacing;
+        self
+    }
+
+    pub fn with_row_col(mut self, row: usize, col: usize) -> Self {
+        self.cells.from = (row, col);
+        self.cells.to = (row, col);
+        self
+    }
+
+    pub fn with_from_to(mut self, from: (usize, usize), to: (usize, usize)) -> Self {
+        self.cells.from = from;
+        self.cells.to = to;
+        self
+    }
+}
+
+impl<T> Component for GridPlaced<T>
+where
+    T: Component,
+{
+    type Msg = T::Msg;
+
+    fn place(&mut self, bounds: Rect) -> Rect {
+        self.grid.area = bounds;
+        self.inner.place(self.grid.cells(self.cells))
+    }
+
+    fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
+        self.inner.event(ctx, event)
+    }
+
+    fn paint(&mut self) {
+        self.inner.paint()
+    }
+}
+
+#[cfg(feature = "ui_debug")]
+impl<T> crate::trace::Trace for GridPlaced<T>
+where
+    T: Component,
+    T: crate::trace::Trace,
+{
+    fn trace(&self, d: &mut dyn crate::trace::Tracer) {
+        d.open("GridPlaced");
+        d.field("inner", &self.inner);
+        d.close();
+    }
+}

core/embed/rust/src/ui/component/text/formatted.rs

@@ -26,10 +26,10 @@ pub struct FormattedText<F, T> {
 }
 
 impl<F, T> FormattedText<F, T> {
-    pub fn new<D: DefaultTextTheme>(area: Rect, format: F) -> Self {
+    pub fn new<D: DefaultTextTheme>(format: F) -> Self {
         Self {
-            layout: TextLayout::new::<D>(area),
             format,
+            layout: TextLayout::new::<D>(),
             args: LinearMap::new(),
             char_offset: 0,
         }
@@ -113,6 +113,11 @@ where
 {
     type Msg = Never;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        self.layout.bounds = bounds;
+        self.layout.bounds
+    }
+
     fn event(&mut self, _ctx: &mut EventCtx, _event: Event) -> Option<Self::Msg> {
         None
     }
@@ -237,32 +242,30 @@ impl<'a> Iterator for Tokenizer<'a> {
 
 #[cfg(test)]
 mod tests {
-    use std::array::IntoIter;
-
     use super::*;
 
     #[test]
     fn tokenizer_yields_expected_tokens() {
-        assert!(Tokenizer::new(b"").eq(IntoIter::new([])));
-        assert!(Tokenizer::new(b"x").eq(IntoIter::new([Token::Literal(b"x")])));
-        assert!(Tokenizer::new(b"x\0y").eq(IntoIter::new([Token::Literal("x\0y".as_bytes())])));
-        assert!(Tokenizer::new(b"{").eq(IntoIter::new([])));
-        assert!(Tokenizer::new(b"x{").eq(IntoIter::new([Token::Literal(b"x")])));
-        assert!(Tokenizer::new(b"x{y").eq(IntoIter::new([Token::Literal(b"x")])));
-        assert!(Tokenizer::new(b"{}").eq(IntoIter::new([Token::Argument(b"")])));
-        assert!(Tokenizer::new(b"x{}y{").eq(IntoIter::new([
+        assert!(Tokenizer::new(b"").eq([]));
+        assert!(Tokenizer::new(b"x").eq([Token::Literal(b"x")]));
+        assert!(Tokenizer::new(b"x\0y").eq([Token::Literal("x\0y".as_bytes())]));
+        assert!(Tokenizer::new(b"{").eq([]));
+        assert!(Tokenizer::new(b"x{").eq([Token::Literal(b"x")]));
+        assert!(Tokenizer::new(b"x{y").eq([Token::Literal(b"x")]));
+        assert!(Tokenizer::new(b"{}").eq([Token::Argument(b"")]));
+        assert!(Tokenizer::new(b"x{}y{").eq([
             Token::Literal(b"x"),
             Token::Argument(b""),
             Token::Literal(b"y"),
-        ])));
-        assert!(Tokenizer::new(b"{\0}").eq(IntoIter::new([Token::Argument("\0".as_bytes()),])));
-        assert!(Tokenizer::new(b"{{y}").eq(IntoIter::new([Token::Argument(b"{y"),])));
-        assert!(Tokenizer::new(b"{{{{xyz").eq(IntoIter::new([])));
-        assert!(Tokenizer::new(b"x{}{{}}}}").eq(IntoIter::new([
+        ]));
+        assert!(Tokenizer::new(b"{\0}").eq([Token::Argument("\0".as_bytes()),]));
+        assert!(Tokenizer::new(b"{{y}").eq([Token::Argument(b"{y"),]));
+        assert!(Tokenizer::new(b"{{{{xyz").eq([]));
+        assert!(Tokenizer::new(b"x{}{{}}}}").eq([
             Token::Literal(b"x"),
             Token::Argument(b""),
             Token::Argument(b"{"),
             Token::Literal(b"}}}"),
-        ])));
+        ]));
     }
 }

core/embed/rust/src/ui/component/text/iter.rs

@@ -0,0 +1,283 @@
+use crate::ui::{
+    component::{text::layout::Op, LineBreaking},
+    display::Font,
+    geometry::Offset,
+};
+use core::iter;
+
+#[derive(Copy, Clone, Eq, PartialEq, Debug)]
+struct LineBreak {
+    /// Index of character **after** the line-break.
+    offset: usize,
+    /// Distance from the last line-break of the sequence, in pixels.
+    width: i32,
+    style: BreakStyle,
+}
+
+#[derive(Copy, Clone, Eq, PartialEq, Debug)]
+enum BreakStyle {
+    Hard,
+    AtWhitespaceOrWordBoundary,
+    InsideWord,
+}
+
+fn limit_line_breaks(
+    breaks: impl Iterator<Item = LineBreak>,
+    line_height: i32,
+    available_height: i32,
+) -> impl Iterator<Item = LineBreak> {
+    breaks.take(available_height as usize / line_height as usize)
+}
+
+#[derive(Copy, Clone, Eq, PartialEq, Debug)]
+enum Appendix {
+    None,
+    Hyphen,
+}
+
+#[derive(Copy, Clone, Eq, PartialEq, Debug)]
+struct Span<'a> {
+    text: &'a str,
+    append: Appendix,
+}
+
+fn break_text_to_spans(
+    text: &str,
+    text_font: impl GlyphMetrics,
+    hyphen_font: impl GlyphMetrics,
+    breaking: LineBreaking,
+    available_width: i32,
+) -> impl Iterator<Item = Span> {
+    let mut finished = false;
+    let mut last_break = LineBreak {
+        offset: 0,
+        width: 0,
+        style: BreakStyle::AtWhitespaceOrWordBoundary,
+    };
+    let mut breaks = select_line_breaks(
+        text.char_indices(),
+        text_font,
+        hyphen_font,
+        breaking,
+        available_width,
+    );
+    iter::from_fn(move || {
+        if finished {
+            None
+        } else if let Some(lb) = breaks.next() {
+            let start_of_line = last_break.offset;
+            let end_of_line = lb.offset; // Not inclusive.
+            last_break = lb;
+            if let BreakStyle::AtWhitespaceOrWordBoundary = lb.style {
+                last_break.offset += 1;
+            }
+            Some(Span {
+                text: &text[start_of_line..end_of_line],
+                append: match lb.style {
+                    BreakStyle::Hard | BreakStyle::AtWhitespaceOrWordBoundary => Appendix::None,
+                    BreakStyle::InsideWord => Appendix::Hyphen,
+                },
+            })
+        } else {
+            finished = true;
+            Some(Span {
+                text: &text[last_break.offset..],
+                append: Appendix::None,
+            })
+        }
+    })
+}
+
+fn select_line_breaks(
+    chars: impl Iterator<Item = (usize, char)>,
+    text_font: impl GlyphMetrics,
+    hyphen_font: impl GlyphMetrics,
+    breaking: LineBreaking,
+    available_width: i32,
+) -> impl Iterator<Item = LineBreak> {
+    let hyphen_width = hyphen_font.char_width('-');
+
+    let mut proposed = None;
+    let mut line_width = 0;
+    let mut found_any_whitespace = false;
+
+    chars.filter_map(move |(offset, ch)| {
+        let char_width = text_font.char_width(ch);
+        let exceeds_available_width = line_width + char_width > available_width;
+        let have_space_for_break = line_width + char_width + hyphen_width <= available_width;
+        let can_break_word =
+            matches!(breaking, LineBreaking::BreakWordsAndInsertHyphen) || !found_any_whitespace;
+
+        let break_line = match ch {
+            '\n' | '\r' => {
+                // Immediate hard break.
+                Some(LineBreak {
+                    offset,
+                    width: line_width,
+                    style: BreakStyle::Hard,
+                })
+            }
+            ' ' | '\t' => {
+                // Whitespace, propose a line-break before this character.
+                proposed = Some(LineBreak {
+                    offset,
+                    width: line_width,
+                    style: BreakStyle::AtWhitespaceOrWordBoundary,
+                });
+                found_any_whitespace = true;
+                None
+            }
+            _ if have_space_for_break && can_break_word => {
+                // Propose a word-break after this character. In case the next character is
+                // whitespace, the proposed word break is replaced by a whitespace break.
+                proposed = Some(LineBreak {
+                    offset: offset + 1,
+                    width: line_width + char_width + hyphen_width,
+                    style: BreakStyle::InsideWord,
+                });
+                None
+            }
+            _ if exceeds_available_width => {
+                // Consume the last proposed line-break. In case we don't have anything
+                // proposed, we hard-break immediately before this character. This only happens
+                // if the first character of the line doesn't fit.
+                Some(proposed.unwrap_or(LineBreak {
+                    offset,
+                    width: line_width,
+                    style: BreakStyle::Hard,
+                }))
+            }
+            _ => None,
+        };
+        if break_line.is_some() {
+            // Reset the state.
+            proposed = None;
+            line_width = 0;
+            found_any_whitespace = false;
+        } else {
+            // Shift cursor.
+            line_width += char_width;
+        }
+        break_line
+    })
+}
+
+trait GlyphMetrics {
+    fn char_width(&self, ch: char) -> i32;
+    fn line_height(&self) -> i32;
+}
+
+impl GlyphMetrics for Font {
+    fn char_width(&self, ch: char) -> i32 {
+        self.text_width(&[ch as u8])
+    }
+
+    fn line_height(&self) -> i32 {
+        Font::line_height(*self)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_selected_line_breaks() {
+        assert_eq!(line_breaks("abcd ef", 34), vec![inside_word(2, 25)]);
+    }
+
+    #[test]
+    fn test_break_text() {
+        assert_eq!(
+            break_text("abcd ef", 24),
+            vec![
+                Span {
+                    text: "a",
+                    append: Appendix::Hyphen
+                },
+                Span {
+                    text: "bcd",
+                    append: Appendix::None
+                },
+                Span {
+                    text: "ef",
+                    append: Appendix::None
+                }
+            ]
+        )
+    }
+
+    #[derive(Copy, Clone)]
+    struct Fixed {
+        width: i32,
+        height: i32,
+    }
+
+    impl GlyphMetrics for Fixed {
+        fn char_width(&self, _ch: char) -> i32 {
+            self.width
+        }
+
+        fn line_height(&self) -> i32 {
+            self.height
+        }
+    }
+
+    fn break_text(s: &str, w: i32) -> Vec<Span> {
+        break_text_to_spans(
+            s,
+            Fixed {
+                width: 10,
+                height: 10,
+            },
+            Fixed {
+                width: 5,
+                height: 10,
+            },
+            LineBreaking::BreakWordsAndInsertHyphen,
+            w,
+        )
+        .collect::<Vec<_>>()
+    }
+
+    fn line_breaks(s: &str, w: i32) -> Vec<LineBreak> {
+        select_line_breaks(
+            s.char_indices(),
+            Fixed {
+                width: 10,
+                height: 10,
+            },
+            Fixed {
+                width: 5,
+                height: 10,
+            },
+            LineBreaking::BreakWordsAndInsertHyphen,
+            w,
+        )
+        .collect::<Vec<_>>()
+    }
+
+    fn hard(offset: usize, width: i32) -> LineBreak {
+        LineBreak {
+            offset,
+            width,
+            style: BreakStyle::Hard,
+        }
+    }
+
+    fn whitespace(offset: usize, width: i32) -> LineBreak {
+        LineBreak {
+            offset,
+            width,
+            style: BreakStyle::AtWhitespaceOrWordBoundary,
+        }
+    }
+
+    fn inside_word(offset: usize, width: i32) -> LineBreak {
+        LineBreak {
+            offset,
+            width,
+            style: BreakStyle::InsideWord,
+        }
+    }
+}

core/embed/rust/src/ui/component/text/layout.rs

@@ -82,9 +82,11 @@ pub trait DefaultTextTheme {
 }
 
 impl TextLayout {
-    pub fn new<T: DefaultTextTheme>(bounds: Rect) -> Self {
+    /// Create a new text layout, with empty size and default text parameters
+    /// filled from `T`.
+    pub fn new<T: DefaultTextTheme>() -> Self {
         Self {
-            bounds,
+            bounds: Rect::zero(),
             padding_top: 0,
             padding_bottom: 0,
             background_color: T::BACKGROUND_COLOR,
@@ -103,10 +105,23 @@ impl TextLayout {
         }
     }
 
+    pub fn with_bounds(mut self, bounds: Rect) -> Self {
+        self.bounds = bounds;
+        self
+    }
+
     pub fn initial_cursor(&self) -> Point {
         self.bounds.top_left() + Offset::y(self.text_font.text_height() + self.padding_top)
     }
 
+    pub fn fit_text(&self, text: &[u8]) -> LayoutFit {
+        self.layout_text(text, &mut self.initial_cursor(), &mut TextNoOp)
+    }
+
+    pub fn render_text(&self, text: &[u8]) {
+        self.layout_text(text, &mut self.initial_cursor(), &mut TextRenderer);
+    }
+
     pub fn layout_ops<'o>(
         mut self,
         ops: &mut dyn Iterator<Item = Op<'o>>,
@@ -235,16 +250,6 @@ impl TextLayout {
         }
     }
 
-    pub fn measure_ops_height(self, ops: &mut dyn Iterator<Item = Op>) -> i32 {
-        self.layout_ops(ops, &mut self.initial_cursor(), &mut TextNoOp)
-            .height()
-    }
-
-    pub fn measure_text_height(self, text: &[u8]) -> i32 {
-        self.layout_text(text, &mut self.initial_cursor(), &mut TextNoOp)
-            .height()
-    }
-
     fn layout_height(&self, init_cursor: Point, end_cursor: Point) -> i32 {
         self.padding_top
             + self.text_font.text_height()

core/embed/rust/src/ui/component/text/mod.rs

@@ -1,3 +1,4 @@
 pub mod formatted;
+mod iter;
 pub mod layout;
 pub mod paragraphs;

core/embed/rust/src/ui/component/text/paragraphs.rs

@@ -3,10 +3,10 @@ use heapless::Vec;
 use crate::ui::{
     component::{Component, Event, EventCtx, Never, Paginate},
     display::Font,
-    geometry::{Dimensions, Insets, LinearLayout, Offset, Rect},
+    geometry::{Dimensions, Insets, LinearPlacement, Rect},
 };
 
-use super::layout::{DefaultTextTheme, LayoutFit, TextLayout, TextNoOp, TextRenderer};
+use super::layout::{DefaultTextTheme, LayoutFit, TextLayout};
 
 pub const MAX_PARAGRAPHS: usize = 6;
 /// Maximum space between paragraphs. Actual result may be smaller (even 0) if
@@ -22,7 +22,7 @@ pub const PARAGRAPH_BOTTOM_SPACE: i32 = 5;
 pub struct Paragraphs<T> {
     area: Rect,
     list: Vec<Paragraph<T>, MAX_PARAGRAPHS>,
-    layout: LinearLayout,
+    placement: LinearPlacement,
     offset: PageOffset,
     visible: usize,
 }
@@ -31,11 +31,11 @@ impl<T> Paragraphs<T>
 where
     T: AsRef<[u8]>,
 {
-    pub fn new(area: Rect) -> Self {
+    pub fn new() -> Self {
         Self {
-            area,
+            area: Rect::zero(),
             list: Vec::new(),
-            layout: LinearLayout::vertical()
+            placement: LinearPlacement::vertical()
                 .align_at_center()
                 .with_spacing(DEFAULT_SPACING),
             offset: PageOffset::default(),
@@ -43,13 +43,13 @@ where
         }
     }
 
-    pub fn with_layout(mut self, layout: LinearLayout) -> Self {
-        self.layout = layout;
+    pub fn with_placement(mut self, placement: LinearPlacement) -> Self {
+        self.placement = placement;
         self
     }
 
     pub fn with_spacing(mut self, spacing: i32) -> Self {
-        self.layout = self.layout.with_spacing(spacing);
+        self.placement = self.placement.with_spacing(spacing);
         self
     }
 
@@ -63,7 +63,7 @@ where
                 text_font,
                 padding_top: PARAGRAPH_TOP_SPACE,
                 padding_bottom: PARAGRAPH_BOTTOM_SPACE,
-                ..TextLayout::new::<D>(self.area)
+                ..TextLayout::new::<D>()
             },
         );
         if self.list.push(paragraph).is_err() {
@@ -82,26 +82,29 @@ where
         let mut char_offset = offset.chr;
         let mut remaining_area = self.area;
 
-        for paragraph in self.list.iter_mut().skip(offset.par) {
-            paragraph.set_area(remaining_area);
+        for paragraph in &mut self.list[self.offset.par..] {
+            paragraph.fit(remaining_area);
             let height = paragraph
                 .layout
-                .measure_text_height(&paragraph.content.as_ref()[char_offset..]);
+                .fit_text(paragraph.content(char_offset))
+                .height();
             if height == 0 {
                 break;
             }
             let (used, free) = remaining_area.split_top(height);
-            paragraph.set_area(used);
+            paragraph.fit(used);
             remaining_area = free;
             self.visible += 1;
             char_offset = 0;
         }
 
-        let visible_paragraphs = &mut self.list[offset.par..offset.par + self.visible];
-        self.layout.arrange(self.area, visible_paragraphs);
+        self.placement.arrange(
+            self.area,
+            &mut self.list[offset.par..offset.par + self.visible],
+        );
     }
 
-    fn break_pages<'a>(&'a self) -> PageBreakIterator<'a, T> {
+    fn break_pages(&self) -> PageBreakIterator<T> {
         PageBreakIterator {
             paragraphs: self,
             current: None,
@@ -115,45 +118,61 @@ where
 {
     type Msg = Never;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        self.area = bounds;
+        self.change_offset(self.offset);
+        self.area
+    }
+
     fn event(&mut self, _ctx: &mut EventCtx, _event: Event) -> Option<Self::Msg> {
         None
     }
 
     fn paint(&mut self) {
         let mut char_offset = self.offset.chr;
-        for paragraph in self.list.iter().skip(self.offset.par).take(self.visible) {
-            paragraph.layout.layout_text(
-                &paragraph.content.as_ref()[char_offset..],
-                &mut paragraph.layout.initial_cursor(),
-                &mut TextRenderer,
-            );
+        for paragraph in &self.list[self.offset.par..self.offset.par + self.visible] {
+            paragraph.layout.render_text(paragraph.content(char_offset));
             char_offset = 0;
         }
     }
 
     fn bounds(&self, sink: &mut dyn FnMut(Rect)) {
         sink(self.area);
-        for paragraph in self.list.iter().skip(self.offset.par).take(self.visible) {
+        for paragraph in &self.list[self.offset.par..self.offset.par + self.visible] {
             sink(paragraph.layout.bounds)
         }
     }
 }
 
-impl<T> Dimensions for Paragraphs<T> {
-    fn get_size(&mut self) -> Offset {
-        self.area.size()
+impl<T> Paginate for Paragraphs<T>
+where
+    T: AsRef<[u8]>,
+{
+    fn page_count(&mut self) -> usize {
+        // There's always at least one page.
+        self.break_pages().count().max(1)
     }
 
-    fn set_area(&mut self, area: Rect) {
-        self.area = area
+    fn change_page(&mut self, to_page: usize) {
+        if let Some(offset) = self.break_pages().nth(to_page) {
+            self.change_offset(offset)
+        } else {
+            // Should not happen, set index past last paragraph to render empty page.
+            self.offset = PageOffset {
+                par: self.list.len(),
+                chr: 0,
+            };
+            self.visible = 0;
+        }
     }
 }
 
 #[cfg(feature = "ui_debug")]
 pub mod trace {
-    use super::*;
     use crate::ui::component::text::layout::trace::TraceSink;
 
+    use super::*;
+
     impl<T> crate::trace::Trace for Paragraphs<T>
     where
         T: AsRef<[u8]>,
@@ -163,7 +182,7 @@ pub mod trace {
             let mut char_offset = self.offset.chr;
             for paragraph in self.list.iter().skip(self.offset.par).take(self.visible) {
                 paragraph.layout.layout_text(
-                    &paragraph.content.as_ref()[char_offset..],
+                    paragraph.content(char_offset),
                     &mut paragraph.layout.initial_cursor(),
                     &mut TraceSink(t),
                 );
@@ -187,18 +206,22 @@ where
     pub fn new(content: T, layout: TextLayout) -> Self {
         Self { content, layout }
     }
+
+    pub fn content(&self, char_offset: usize) -> &[u8] {
+        &self.content.as_ref()[char_offset..]
+    }
 }
 
 impl<T> Dimensions for Paragraph<T>
 where
     T: AsRef<[u8]>,
 {
-    fn get_size(&mut self) -> Offset {
-        self.layout.bounds.size()
+    fn fit(&mut self, area: Rect) {
+        self.layout.bounds = area;
     }
 
-    fn set_area(&mut self, area: Rect) {
-        self.layout.bounds = area;
+    fn area(&self) -> Rect {
+        self.layout.bounds
     }
 }
 
@@ -240,39 +263,32 @@ where
         let mut progress = false;
 
         for paragraph in self.paragraphs.list.iter().skip(current.par) {
-            loop {
-                let mut temp_layout = paragraph.layout;
-                temp_layout.bounds = remaining_area;
+            let fit = paragraph
+                .layout
+                .with_bounds(remaining_area)
+                .fit_text(paragraph.content(current.chr));
+            match fit {
+                LayoutFit::Fitting { height, .. } => {
+                    // Text fits, update remaining area.
+                    remaining_area = remaining_area.inset(Insets::top(height));
 
-                let fit = temp_layout.layout_text(
-                    &paragraph.content.as_ref()[current.chr..],
-                    &mut temp_layout.initial_cursor(),
-                    &mut TextNoOp,
-                );
-                match fit {
-                    LayoutFit::Fitting { height, .. } => {
-                        // Text fits, update remaining area.
-                        remaining_area = remaining_area.inset(Insets::top(height));
-
-                        // Continue with start of next paragraph.
-                        current.par += 1;
-                        current.chr = 0;
-                        progress = true;
-                        break;
-                    }
-                    LayoutFit::OutOfBounds {
-                        processed_chars, ..
-                    } => {
-                        // Text does not fit, assume whatever fits takes the entire remaining area.
-                        current.chr += processed_chars;
-                        if processed_chars == 0 && !progress {
-                            // Nothing fits yet page is empty: terminate iterator to avoid looping
-                            // forever.
-                            return None;
-                        }
-                        // Return current offset.
-                        return self.current;
+                    // Continue with start of next paragraph.
+                    current.par += 1;
+                    current.chr = 0;
+                    progress = true;
+                }
+                LayoutFit::OutOfBounds {
+                    processed_chars, ..
+                } => {
+                    // Text does not fit, assume whatever fits takes the entire remaining area.
+                    current.chr += processed_chars;
+                    if processed_chars == 0 && !progress {
+                        // Nothing fits yet page is empty: terminate iterator to avoid looping
+                        // forever.
+                        return None;
                     }
+                    // Return current offset.
+                    return self.current;
                 }
             }
         }
@@ -281,26 +297,3 @@ where
         None
     }
 }
-
-impl<T> Paginate for Paragraphs<T>
-where
-    T: AsRef<[u8]>,
-{
-    fn page_count(&mut self) -> usize {
-        // There's always at least one page.
-        self.break_pages().count().max(1)
-    }
-
-    fn change_page(&mut self, to_page: usize) {
-        if let Some(offset) = self.break_pages().skip(to_page).next() {
-            self.change_offset(offset)
-        } else {
-            // Should not happen, set index past last paragraph to render empty page.
-            self.offset = PageOffset {
-                par: self.list.len(),
-                chr: 0,
-            };
-            self.visible = 0;
-        }
-    }
-}

core/embed/rust/src/ui/component/tuple.rs

@@ -1,84 +0,0 @@
-use super::{Component, Event, EventCtx};
-use crate::ui::geometry::Rect;
-
-impl<T, A, B> Component for (A, B)
-where
-    A: Component<Msg = T>,
-    B: Component<Msg = T>,
-{
-    type Msg = T;
-
-    fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
-        self.0
-            .event(ctx, event)
-            .or_else(|| self.1.event(ctx, event))
-    }
-
-    fn paint(&mut self) {
-        self.0.paint();
-        self.1.paint();
-    }
-
-    fn bounds(&self, sink: &mut dyn FnMut(Rect)) {
-        self.0.bounds(sink);
-        self.1.bounds(sink);
-    }
-}
-
-impl<T, A, B, C> Component for (A, B, C)
-where
-    A: Component<Msg = T>,
-    B: Component<Msg = T>,
-    C: Component<Msg = T>,
-{
-    type Msg = T;
-
-    fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
-        self.0
-            .event(ctx, event)
-            .or_else(|| self.1.event(ctx, event))
-            .or_else(|| self.2.event(ctx, event))
-    }
-
-    fn paint(&mut self) {
-        self.0.paint();
-        self.1.paint();
-        self.2.paint();
-    }
-
-    fn bounds(&self, sink: &mut dyn FnMut(Rect)) {
-        self.0.bounds(sink);
-        self.1.bounds(sink);
-        self.2.bounds(sink);
-    }
-}
-
-#[cfg(feature = "ui_debug")]
-impl<T, A, B> crate::trace::Trace for (A, B)
-where
-    A: Component<Msg = T> + crate::trace::Trace,
-    B: Component<Msg = T> + crate::trace::Trace,
-{
-    fn trace(&self, t: &mut dyn crate::trace::Tracer) {
-        t.open("Tuple");
-        t.field("0", &self.0);
-        t.field("1", &self.1);
-        t.close();
-    }
-}
-
-#[cfg(feature = "ui_debug")]
-impl<T, A, B, C> crate::trace::Trace for (A, B, C)
-where
-    A: Component<Msg = T> + crate::trace::Trace,
-    B: Component<Msg = T> + crate::trace::Trace,
-    C: Component<Msg = T> + crate::trace::Trace,
-{
-    fn trace(&self, t: &mut dyn crate::trace::Tracer) {
-        t.open("Tuple");
-        t.field("0", &self.0);
-        t.field("1", &self.1);
-        t.field("2", &self.2);
-        t.close();
-    }
-}

core/embed/rust/src/ui/geometry.rs

@@ -148,6 +148,22 @@ impl Rect {
         }
     }
 
+    pub fn with_top_left(self, p0: Point) -> Self {
+        Self::from_top_left_and_size(p0, self.size())
+    }
+
+    pub fn with_size(self, size: Offset) -> Self {
+        Self::from_top_left_and_size(self.top_left(), size)
+    }
+
+    pub fn with_width(self, width: i32) -> Self {
+        self.with_size(Offset::new(width, self.height()))
+    }
+
+    pub fn with_height(self, height: i32) -> Self {
+        self.with_size(Offset::new(self.width(), height))
+    }
+
     pub fn width(&self) -> i32 {
         self.x1 - self.x0
     }
@@ -399,16 +415,28 @@ impl Grid {
     pub fn cell(&self, index: usize) -> Rect {
         self.row_col(index / self.cols, index % self.cols)
     }
+
+    pub fn cells(&self, cells: GridCellSpan) -> Rect {
+        let from = self.row_col(cells.from.0, cells.to.1);
+        let to = self.row_col(cells.to.0, cells.to.1);
+        from.union(to)
+    }
 }
 
 #[derive(Copy, Clone)]
-pub struct LinearLayout {
+pub struct GridCellSpan {
+    pub from: (usize, usize),
+    pub to: (usize, usize),
+}
+
+#[derive(Copy, Clone)]
+pub struct LinearPlacement {
     axis: Axis,
     align: Alignment,
     spacing: i32,
 }
 
-impl LinearLayout {
+impl LinearPlacement {
     pub fn horizontal() -> Self {
         Self {
             axis: Axis::Horizontal,
@@ -445,42 +473,20 @@ impl LinearLayout {
         self
     }
 
-    fn compute_spacing(&self, area: Rect, count: usize, size_sum: i32) -> (i32, i32) {
-        let spacing_count = count.saturating_sub(1);
-        let spacing_sum = spacing_count as i32 * self.spacing;
-        let naive_size = size_sum + spacing_sum;
-        let available_space = area.size().axis(self.axis);
-
-        // scale down spacing to fit everything into area
-        let (total_size, spacing) = if naive_size > available_space {
-            let scaled_space = (available_space - size_sum) / spacing_count as i32;
-            // forbid negative spacing
-            (available_space, scaled_space.max(0))
-        } else {
-            (naive_size, self.spacing)
-        };
-
-        let init_cursor = match self.align {
-            Alignment::Start => 0,
-            Alignment::Center => available_space / 2 - total_size / 2,
-            Alignment::End => available_space - total_size,
-        };
-
-        (init_cursor, spacing)
-    }
-
     /// Arranges all `items` by parameters configured in `self` into `area`.
-    /// Does not change the size of the items (only the position), but it needs
-    /// to iterate (and ask for the size) twice.
+    /// Does not change the size of the items (only the position).
     pub fn arrange(&self, area: Rect, items: &mut [impl Dimensions]) {
-        let item_sum: i32 = items.iter_mut().map(|i| i.get_size().axis(self.axis)).sum();
-        let (mut cursor, spacing) = self.compute_spacing(area, items.len(), item_sum);
+        let size_sum: i32 = items
+            .iter_mut()
+            .map(|i| i.area().size().axis(self.axis))
+            .sum();
+        let (mut cursor, spacing) = self.compute_spacing(area, items.len(), size_sum);
 
         for item in items {
-            let top_left = area.top_left() + Offset::on_axis(self.axis, cursor);
-            let size = item.get_size();
-            item.set_area(Rect::from_top_left_and_size(top_left, size));
-            cursor += size.axis(self.axis);
+            let item_origin = area.top_left() + Offset::on_axis(self.axis, cursor);
+            let item_area = item.area().with_top_left(item_origin);
+            item.fit(item_area);
+            cursor += item_area.size().axis(self.axis);
             cursor += spacing;
         }
     }
@@ -509,10 +515,34 @@ impl LinearLayout {
             cursor += spacing;
         }
     }
+
+    fn compute_spacing(&self, area: Rect, count: usize, size_sum: i32) -> (i32, i32) {
+        let spacing_count = count.saturating_sub(1);
+        let spacing_sum = spacing_count as i32 * self.spacing;
+        let naive_size = size_sum + spacing_sum;
+        let available_space = area.size().axis(self.axis);
+
+        // scale down spacing to fit everything into area
+        let (total_size, spacing) = if naive_size > available_space {
+            let scaled_space = (available_space - size_sum) / spacing_count.max(1) as i32;
+            // forbid negative spacing
+            (available_space, scaled_space.max(0))
+        } else {
+            (naive_size, self.spacing)
+        };
+
+        let initial_cursor = match self.align {
+            Alignment::Start => 0,
+            Alignment::Center => available_space / 2 - total_size / 2,
+            Alignment::End => available_space - total_size,
+        };
+
+        (initial_cursor, spacing)
+    }
 }
 
-/// Types that have a size and a position.
+/// Types that can place themselves within area specified by `bounds`.
 pub trait Dimensions {
-    fn get_size(&mut self) -> Offset;
-    fn set_area(&mut self, area: Rect);
+    fn fit(&mut self, bounds: Rect);
+    fn area(&self) -> Rect;
 }

core/embed/rust/src/ui/layout/obj.rs

@@ -55,6 +55,7 @@ mod maybe_trace {
     impl<T> MaybeTrace for T {}
 }
 
+use crate::ui::display;
 /// Stand-in for the optionally-compiled trait `Trace`.
 /// If UI debugging is enabled, `MaybeTrace` implies `Trace` and is implemented
 /// for everything that implements Trace. If disabled, `MaybeTrace` is
@@ -69,6 +70,7 @@ use maybe_trace::MaybeTrace;
 /// T>` field. `Component` itself is not object-safe because of `Component::Msg`
 /// associated type.
 pub trait ObjComponent: MaybeTrace {
+    fn obj_place(&mut self, bounds: Rect) -> Rect;
     fn obj_event(&mut self, ctx: &mut EventCtx, event: Event) -> Result<Obj, Error>;
     fn obj_paint(&mut self);
     fn obj_bounds(&self, sink: &mut dyn FnMut(Rect));
@@ -78,6 +80,10 @@ impl<T> ObjComponent for Child<T>
 where
     T: ComponentMsgObj + MaybeTrace,
 {
+    fn obj_place(&mut self, bounds: Rect) -> Rect {
+        self.place(bounds)
+    }
+
     fn obj_event(&mut self, ctx: &mut EventCtx, event: Event) -> Result<Obj, Error> {
         if let Some(msg) = self.event(ctx, event) {
             self.inner().msg_try_into_obj(msg)
@@ -143,6 +149,12 @@ impl LayoutObj {
     fn obj_event(&self, event: Event) -> Result<Obj, Error> {
         let inner = &mut *self.inner.borrow_mut();
 
+        // Place the root component on the screen in case it was previously requested.
+        if inner.event_ctx.needs_place_before_next_event_or_paint() {
+            // SAFETY: `inner.root` is unique because of the `inner.borrow_mut()`.
+            unsafe { Gc::as_mut(&mut inner.root) }.obj_place(display::screen());
+        }
+
         // Clear the leftover flags from the previous event pass.
         inner.event_ctx.clear();
 
@@ -170,6 +182,13 @@ impl LayoutObj {
     /// Run a paint pass over the component tree.
     fn obj_paint_if_requested(&self) {
         let mut inner = self.inner.borrow_mut();
+
+        // Place the root component on the screen in case it was previously requested.
+        if inner.event_ctx.needs_place_before_next_event_or_paint() {
+            // SAFETY: `inner.root` is unique because of the `inner.borrow_mut()`.
+            unsafe { Gc::as_mut(&mut inner.root) }.obj_place(display::screen());
+        }
+
         // SAFETY: `inner.root` is unique because of the `inner.borrow_mut()`.
         unsafe { Gc::as_mut(&mut inner.root) }.obj_paint();
     }

core/embed/rust/src/ui/model_t1/component/button.rs

@@ -38,34 +38,23 @@ pub struct Button<T> {
 }
 
 impl<T: AsRef<[u8]>> Button<T> {
-    pub fn new(
-        area: Rect,
-        pos: ButtonPos,
-        content: ButtonContent<T>,
-        styles: ButtonStyleSheet,
-    ) -> Self {
-        let (area, baseline) = Self::placement(area, pos, &content, &styles);
+    pub fn new(pos: ButtonPos, content: ButtonContent<T>, styles: ButtonStyleSheet) -> Self {
         Self {
-            area,
             pos,
-            baseline,
             content,
             styles,
+            baseline: Point::zero(),
+            area: Rect::zero(),
             state: State::Released,
         }
     }
 
-    pub fn with_text(area: Rect, pos: ButtonPos, text: T, styles: ButtonStyleSheet) -> Self {
-        Self::new(area, pos, ButtonContent::Text(text), styles)
+    pub fn with_text(pos: ButtonPos, text: T, styles: ButtonStyleSheet) -> Self {
+        Self::new(pos, ButtonContent::Text(text), styles)
     }
 
-    pub fn with_icon(
-        area: Rect,
-        pos: ButtonPos,
-        image: &'static [u8],
-        styles: ButtonStyleSheet,
-    ) -> Self {
-        Self::new(area, pos, ButtonContent::Icon(image), styles)
+    pub fn with_icon(pos: ButtonPos, image: &'static [u8], styles: ButtonStyleSheet) -> Self {
+        Self::new(pos, ButtonContent::Icon(image), styles)
     }
 
     pub fn content(&self) -> &ButtonContent<T> {
@@ -109,9 +98,19 @@ impl<T: AsRef<[u8]>> Button<T> {
     }
 }
 
-impl<T: AsRef<[u8]>> Component for Button<T> {
+impl<T> Component for Button<T>
+where
+    T: AsRef<[u8]>,
+{
     type Msg = ButtonMsg;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        let (area, baseline) = Self::placement(bounds, self.pos, &self.content, &self.styles);
+        self.area = area;
+        self.baseline = baseline;
+        self.area
+    }
+
     fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
         match event {
             Event::Button(ButtonEvent::ButtonPressed(which)) if self.pos.hit(&which) => {

core/embed/rust/src/ui/model_t1/component/dialog.rs

@@ -1,5 +1,5 @@
 use super::{
-    button::{Button, ButtonMsg::Clicked, ButtonPos},
+    button::{Button, ButtonMsg::Clicked},
     theme,
 };
 use crate::ui::{
@@ -19,34 +19,36 @@ pub struct Dialog<T, U> {
     right_btn: Option<Child<Button<U>>>,
 }
 
-impl<T: Component, U: AsRef<[u8]>> Dialog<T, U> {
-    pub fn new(
-        area: Rect,
-        content: impl FnOnce(Rect) -> T,
-        left: Option<impl FnOnce(Rect, ButtonPos) -> Button<U>>,
-        right: Option<impl FnOnce(Rect, ButtonPos) -> Button<U>>,
-    ) -> Self {
-        let (content_area, button_area) = Self::areas(area);
-        let content = Child::new(content(content_area));
-        let left_btn = left.map(|f| Child::new(f(button_area, ButtonPos::Left)));
-        let right_btn = right.map(|f| Child::new(f(button_area, ButtonPos::Right)));
+impl<T, U> Dialog<T, U>
+where
+    T: Component,
+    U: AsRef<[u8]>,
+{
+    pub fn new(content: T, left: Option<Button<U>>, right: Option<Button<U>>) -> Self {
         Self {
-            content,
-            left_btn,
-            right_btn,
+            content: Child::new(content),
+            left_btn: left.map(Child::new),
+            right_btn: right.map(Child::new),
         }
     }
-
-    fn areas(area: Rect) -> (Rect, Rect) {
-        let button_height = theme::FONT_BOLD.line_height() + 2;
-        let (content_area, button_area) = area.split_bottom(button_height);
-        (content_area, button_area)
-    }
 }
 
-impl<T: Component, U: AsRef<[u8]>> Component for Dialog<T, U> {
+impl<T, U> Component for Dialog<T, U>
+where
+    T: Component,
+    U: AsRef<[u8]>,
+{
     type Msg = DialogMsg<T::Msg>;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        let button_height = theme::FONT_BOLD.line_height() + 2;
+        let (content_area, button_area) = bounds.split_bottom(button_height);
+        self.content.place(content_area);
+        self.left_btn.as_mut().map(|b| b.place(button_area));
+        self.right_btn.as_mut().map(|b| b.place(button_area));
+        bounds
+    }
+
     fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
         if let Some(msg) = self.content.event(ctx, event) {
             Some(DialogMsg::Content(msg))

core/embed/rust/src/ui/model_t1/component/frame.rs

@@ -1,8 +1,8 @@
 use super::theme;
 use crate::ui::{
-    component::{Child, Component, ComponentExt, Event, EventCtx},
+    component::{Child, Component, Event, EventCtx},
     display,
-    geometry::{Offset, Rect},
+    geometry::{Insets, Offset, Rect},
 };
 
 pub struct Frame<T, U> {
@@ -11,30 +11,38 @@ pub struct Frame<T, U> {
     content: Child<T>,
 }
 
-impl<T: Component, U: AsRef<[u8]>> Frame<T, U> {
-    pub fn new(area: Rect, title: U, content: impl FnOnce(Rect) -> T) -> Self {
-        let (title_area, content_area) = Self::areas(area);
+impl<T, U> Frame<T, U>
+where
+    T: Component,
+    U: AsRef<[u8]>,
+{
+    pub fn new(title: U, content: T) -> Self {
         Self {
-            area: title_area,
             title,
-            content: content(content_area).into_child(),
+            area: Rect::zero(),
+            content: Child::new(content),
         }
     }
-
-    fn areas(area: Rect) -> (Rect, Rect) {
-        const HEADER_SPACE: i32 = 4;
-        let header_height = theme::FONT_BOLD.line_height();
-
-        let (header_area, content_area) = area.split_top(header_height);
-        let (_space, content_area) = content_area.split_top(HEADER_SPACE);
-
-        (header_area, content_area)
-    }
 }
 
-impl<T: Component, U: AsRef<[u8]>> Component for Frame<T, U> {
+impl<T, U> Component for Frame<T, U>
+where
+    T: Component,
+    U: AsRef<[u8]>,
+{
     type Msg = T::Msg;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        const TITLE_SPACE: i32 = 4;
+
+        let (title_area, content_area) = bounds.split_top(theme::FONT_BOLD.line_height());
+        let content_area = content_area.inset(Insets::top(TITLE_SPACE));
+
+        self.area = title_area;
+        self.content.place(content_area);
+        bounds
+    }
+
     fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
         self.content.event(ctx, event)
     }

core/embed/rust/src/ui/model_t1/component/page.rs

@@ -21,54 +21,18 @@ where
     T: Paginate,
     T: Component,
 {
-    pub fn new(area: Rect, content: impl FnOnce(Rect) -> T, background: Color) -> Self {
-        let (content_area, scrollbar_area, button_area) = Self::areas(area);
-        let mut content = content(content_area);
-        let pad = Pad::with_background(area, background);
-
-        // Always start at the first page.
-        let scrollbar = ScrollBar::vertical_right(scrollbar_area, content.page_count(), 0);
-
-        // Create the button controls.
-        let prev = Button::with_text(button_area, ButtonPos::Left, "BACK", theme::button_cancel());
-        let next = Button::with_text(
-            button_area,
-            ButtonPos::Right,
-            "NEXT",
-            theme::button_default(),
-        );
-        let cancel = Button::with_text(
-            button_area,
-            ButtonPos::Left,
-            "CANCEL",
-            theme::button_cancel(),
-        );
-        let confirm = Button::with_text(
-            button_area,
-            ButtonPos::Right,
-            "CONFIRM",
-            theme::button_default(),
-        );
-
+    pub fn new(content: T, background: Color) -> Self {
         Self {
             content,
-            scrollbar,
-            pad,
-            prev,
-            next,
-            cancel,
-            confirm,
+            scrollbar: ScrollBar::vertical(),
+            pad: Pad::with_background(background),
+            prev: Button::with_text(ButtonPos::Left, "BACK", theme::button_cancel()),
+            next: Button::with_text(ButtonPos::Right, "NEXT", theme::button_default()),
+            cancel: Button::with_text(ButtonPos::Left, "CANCEL", theme::button_cancel()),
+            confirm: Button::with_text(ButtonPos::Right, "CONFIRM", theme::button_default()),
         }
     }
 
-    fn areas(area: Rect) -> (Rect, Rect, Rect) {
-        let button_height = theme::FONT_BOLD.line_height() + 2;
-        let (content_area, button_area) = area.split_bottom(button_height);
-        let (content_area, scrollbar_area) = content_area.split_right(ScrollBar::WIDTH);
-        let (content_area, _) = content_area.split_bottom(1);
-        (content_area, scrollbar_area, button_area)
-    }
-
     fn change_page(&mut self, ctx: &mut EventCtx, page: usize) {
         // Change the page in the content, clear the background under it and make sure
         // it gets completely repainted.
@@ -85,6 +49,23 @@ where
 {
     type Msg = PageMsg<T::Msg, bool>;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        let button_height = theme::FONT_BOLD.line_height() + 2;
+        let (content_area, button_area) = bounds.split_bottom(button_height);
+        let (content_area, scrollbar_area) = content_area.split_right(ScrollBar::WIDTH);
+        let content_area = content_area.inset(Insets::top(1));
+        self.pad.place(bounds);
+        self.content.place(content_area);
+        let page_count = self.content.page_count();
+        self.scrollbar.set_count_and_active_page(page_count, 0);
+        self.scrollbar.place(scrollbar_area);
+        self.prev.place(button_area);
+        self.next.place(button_area);
+        self.cancel.place(button_area);
+        self.confirm.place(button_area);
+        bounds
+    }
+
     fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
         if self.scrollbar.has_previous_page() {
             if let Some(ButtonMsg::Clicked) = self.prev.event(ctx, event) {
@@ -156,14 +137,19 @@ impl ScrollBar {
     pub const DOT_SIZE: Offset = Offset::new(4, 4);
     pub const DOT_INTERVAL: i32 = 6;
 
-    pub fn vertical_right(area: Rect, page_count: usize, active_page: usize) -> Self {
+    pub fn vertical() -> Self {
         Self {
-            area,
-            page_count,
-            active_page,
+            area: Rect::zero(),
+            page_count: 0,
+            active_page: 0,
         }
     }
 
+    pub fn set_count_and_active_page(&mut self, page_count: usize, active_page: usize) {
+        self.page_count = page_count;
+        self.active_page = active_page;
+    }
+
     pub fn has_next_page(&self) -> bool {
         self.active_page < self.page_count - 1
     }
@@ -208,6 +194,11 @@ impl ScrollBar {
 impl Component for ScrollBar {
     type Msg = Never;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        self.area = bounds;
+        self.area
+    }
+
     fn event(&mut self, _ctx: &mut EventCtx, _event: Event) -> Option<Self::Msg> {
         None
     }

core/embed/rust/src/ui/model_t1/layout.rs

@@ -4,8 +4,8 @@ use crate::{
     micropython::{buffer::Buffer, map::Map, obj::Obj, qstr::Qstr},
     ui::{
         component::{text::paragraphs::Paragraphs, FormattedText},
-        display,
         layout::obj::LayoutObj,
+        model_t1::component::ButtonPos,
     },
     util,
 };
@@ -40,21 +40,19 @@ extern "C" fn ui_layout_new_confirm_action(
         };
 
         let left = verb_cancel
-            .map(|label| |area, pos| Button::with_text(area, pos, label, theme::button_cancel()));
-        let right = verb
-            .map(|label| |area, pos| Button::with_text(area, pos, label, theme::button_default()));
+            .map(|label| Button::with_text(ButtonPos::Left, label, theme::button_cancel()));
+        let right =
+            verb.map(|label| Button::with_text(ButtonPos::Right, label, theme::button_default()));
 
-        let obj = LayoutObj::new(Frame::new(display::screen(), title, |area| {
+        let obj = LayoutObj::new(Frame::new(
+            title,
             ButtonPage::new(
-                area,
-                |area| {
-                    FormattedText::new::<theme::T1DefaultText>(area, format)
-                        .with(b"action", action.unwrap_or("".into()))
-                        .with(b"description", description.unwrap_or("".into()))
-                },
+                FormattedText::new::<theme::T1DefaultText>(format)
+                    .with(b"action", action.unwrap_or_default())
+                    .with(b"description", description.unwrap_or_default()),
                 theme::BG,
-            )
-        }))?;
+            ),
+        ))?;
         Ok(obj.into())
     };
     unsafe { util::try_with_args_and_kwargs(n_args, args, kwargs, block) }
@@ -72,20 +70,18 @@ extern "C" fn ui_layout_new_confirm_text(
         let description: Option<Buffer> =
             kwargs.get(Qstr::MP_QSTR_description)?.try_into_option()?;
 
-        let obj = LayoutObj::new(Frame::new(display::screen(), title, |area| {
+        let obj = LayoutObj::new(Frame::new(
+            title,
             ButtonPage::new(
-                area,
-                |area| {
-                    Paragraphs::new(area)
-                        .add::<theme::T1DefaultText>(
-                            theme::FONT_NORMAL,
-                            description.unwrap_or("".into()),
-                        )
-                        .add::<theme::T1DefaultText>(theme::FONT_BOLD, data)
-                },
+                Paragraphs::new()
+                    .add::<theme::T1DefaultText>(
+                        theme::FONT_NORMAL,
+                        description.unwrap_or_default(),
+                    )
+                    .add::<theme::T1DefaultText>(theme::FONT_BOLD, data),
                 theme::BG,
-            )
-        }))?;
+            ),
+        ))?;
         Ok(obj.into())
     };
     unsafe { util::try_with_args_and_kwargs(n_args, args, kwargs, block) }
@@ -96,7 +92,11 @@ mod tests {
     use crate::{
         error::Error,
         trace::Trace,
-        ui::model_t1::component::{Dialog, DialogMsg},
+        ui::{
+            component::Component,
+            display,
+            model_t1::component::{Dialog, DialogMsg},
+        },
     };
 
     use super::*;
@@ -125,18 +125,23 @@ mod tests {
 
     #[test]
     fn trace_example_layout() {
-        let layout = Dialog::new(
-            display::screen(),
-            |area| {
-                FormattedText::new::<theme::T1DefaultText>(
-                    area,
-                    "Testing text layout, with some text, and some more text. And {param}",
-                )
-                .with(b"param", b"parameters!")
-            },
-            Some(|area, pos| Button::with_text(area, pos, "Left", theme::button_cancel())),
-            Some(|area, pos| Button::with_text(area, pos, "Right", theme::button_default())),
+        let mut layout = Dialog::new(
+            FormattedText::new::<theme::T1DefaultText>(
+                "Testing text layout, with some text, and some more text. And {param}",
+            )
+            .with(b"param", b"parameters!"),
+            Some(Button::with_text(
+                ButtonPos::Left,
+                "Left",
+                theme::button_cancel(),
+            )),
+            Some(Button::with_text(
+                ButtonPos::Right,
+                "Right",
+                theme::button_default(),
+            )),
         );
+        layout.place(display::screen());
         assert_eq!(
             trace(&layout),
             r#"<Dialog content:<Text content:Testing text layout,
@@ -148,20 +153,26 @@ arameters! > left:<Button text:Left > right:<Button text:Right > >"#
 
     #[test]
     fn trace_layout_title() {
-        let layout = Frame::new(display::screen(), "Please confirm", |area| {
+        let mut layout = Frame::new(
+            "Please confirm",
             Dialog::new(
-                area,
-                |area| {
-                    FormattedText::new::<theme::T1DefaultText>(
-                        area,
-                        "Testing text layout, with some text, and some more text. And {param}",
-                    )
-                    .with(b"param", b"parameters!")
-                },
-                Some(|area, pos| Button::with_text(area, pos, "Left", theme::button_cancel())),
-                Some(|area, pos| Button::with_text(area, pos, "Right", theme::button_default())),
-            )
-        });
+                FormattedText::new::<theme::T1DefaultText>(
+                    "Testing text layout, with some text, and some more text. And {param}",
+                )
+                .with(b"param", b"parameters!"),
+                Some(Button::with_text(
+                    ButtonPos::Left,
+                    "Left",
+                    theme::button_cancel(),
+                )),
+                Some(Button::with_text(
+                    ButtonPos::Right,
+                    "Right",
+                    theme::button_default(),
+                )),
+            ),
+        );
+        layout.place(display::screen());
         assert_eq!(
             trace(&layout),
             r#"<Frame title:Please confirm content:<Dialog content:<Text content:Testing text layout,

core/embed/rust/src/ui/model_tt/component/button.rs

@@ -1,7 +1,7 @@
 use crate::ui::{
-    component::{Component, Event, EventCtx, Map},
+    component::{Component, ComponentExt, Event, EventCtx, GridPlaced, Map},
     display::{self, Color, Font},
-    geometry::{Grid, Insets, Offset, Rect},
+    geometry::{Insets, Offset, Rect},
 };
 
 use super::{event::TouchEvent, theme};
@@ -27,25 +27,25 @@ impl<T> Button<T> {
     /// (positive).
     pub const BASELINE_OFFSET: i32 = -3;
 
-    pub fn new(area: Rect, content: ButtonContent<T>) -> Self {
+    pub fn new(content: ButtonContent<T>) -> Self {
         Self {
-            area,
             content,
+            area: Rect::zero(),
             styles: theme::button_default(),
             state: State::Initial,
         }
     }
 
-    pub fn with_text(area: Rect, text: T) -> Self {
-        Self::new(area, ButtonContent::Text(text))
+    pub fn with_text(text: T) -> Self {
+        Self::new(ButtonContent::Text(text))
     }
 
-    pub fn with_icon(area: Rect, image: &'static [u8]) -> Self {
-        Self::new(area, ButtonContent::Icon(image))
+    pub fn with_icon(image: &'static [u8]) -> Self {
+        Self::new(ButtonContent::Icon(image))
     }
 
-    pub fn empty(area: Rect) -> Self {
-        Self::new(area, ButtonContent::Empty)
+    pub fn empty() -> Self {
+        Self::new(ButtonContent::Empty)
     }
 
     pub fn styled(mut self, styles: ButtonStyleSheet) -> Self {
@@ -53,6 +53,14 @@ impl<T> Button<T> {
         self
     }
 
+    pub fn enable_if(&mut self, ctx: &mut EventCtx, enabled: bool) {
+        if enabled {
+            self.enable(ctx);
+        } else {
+            self.disable(ctx);
+        }
+    }
+
     pub fn enable(&mut self, ctx: &mut EventCtx) {
         self.set(ctx, State::Initial)
     }
@@ -61,14 +69,6 @@ impl<T> Button<T> {
         self.set(ctx, State::Disabled)
     }
 
-    pub fn enabled(&mut self, ctx: &mut EventCtx, enabled: bool) {
-        if enabled {
-            self.enable(ctx);
-        } else {
-            self.disable(ctx);
-        }
-    }
-
     pub fn is_enabled(&self) -> bool {
         matches!(
             self.state,
@@ -186,6 +186,11 @@ where
 {
     type Msg = ButtonMsg;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        self.area = bounds;
+        self.area
+    }
+
     fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
         match event {
             Event::Touch(TouchEvent::TouchStart(pos)) => {
@@ -297,26 +302,29 @@ pub struct ButtonStyle {
 }
 
 impl<T> Button<T> {
-    pub fn array2<F0, F1, R>(
-        area: Rect,
-        left: impl FnOnce(Rect) -> Button<T>,
+    pub fn left_right<F0, F1, R>(
+        left: Button<T>,
         left_map: F0,
-        right: impl FnOnce(Rect) -> Button<T>,
+        right: Button<T>,
         right_map: F1,
-    ) -> (Map<Self, F0>, Map<Self, F1>)
+    ) -> (Map<GridPlaced<Self>, F0>, Map<GridPlaced<Self>, F1>)
     where
         F0: Fn(ButtonMsg) -> Option<R>,
         F1: Fn(ButtonMsg) -> Option<R>,
         T: AsRef<[u8]>,
     {
         const BUTTON_SPACING: i32 = 6;
-        let grid = Grid::new(area, 1, 3).with_spacing(BUTTON_SPACING);
-        let left = left(grid.row_col(0, 0));
-        let right = right(Rect::new(
-            grid.row_col(0, 1).top_left(),
-            grid.row_col(0, 2).bottom_right(),
-        ));
-
-        (Map::new(left, left_map), Map::new(right, right_map))
+        (
+            GridPlaced::new(left)
+                .with_grid(1, 3)
+                .with_spacing(BUTTON_SPACING)
+                .with_row_col(0, 0)
+                .map(left_map),
+            GridPlaced::new(right)
+                .with_grid(1, 3)
+                .with_spacing(BUTTON_SPACING)
+                .with_from_to((0, 1), (0, 2))
+                .map(right_map),
+        )
     }
 }

core/embed/rust/src/ui/model_tt/component/confirm.rs

@@ -3,10 +3,11 @@ use crate::{
     ui::{
         component::{Child, Component, ComponentExt, Event, EventCtx, Pad},
         geometry::Rect,
+        model_tt::component::DialogLayout,
     },
 };
 
-use super::{theme, Button, ButtonMsg, DialogLayout, Loader, LoaderMsg};
+use super::{theme, Button, ButtonMsg, Loader, LoaderMsg};
 
 pub enum HoldToConfirmMsg<T> {
     Content(T),
@@ -26,14 +27,13 @@ impl<T> HoldToConfirm<T>
 where
     T: Component,
 {
-    pub fn new(area: Rect, content: impl FnOnce(Rect) -> T) -> Self {
-        let layout = DialogLayout::middle(area);
+    pub fn new(content: T) -> Self {
         Self {
             loader: Loader::new(0),
-            content: content(layout.content).into_child(),
-            cancel: Button::with_text(layout.left, "Cancel").into_child(),
-            confirm: Button::with_text(layout.right, "Hold").into_child(),
-            pad: Pad::with_background(layout.content, theme::BG),
+            content: Child::new(content),
+            cancel: Child::new(Button::with_text("Cancel")),
+            confirm: Child::new(Button::with_text("Hold")),
+            pad: Pad::with_background(theme::BG),
         }
     }
 }
@@ -44,6 +44,15 @@ where
 {
     type Msg = HoldToConfirmMsg<T::Msg>;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        let layout = DialogLayout::middle(bounds);
+        self.loader.place(layout.content);
+        self.content.place(layout.content);
+        self.cancel.place(layout.left);
+        self.confirm.place(layout.right);
+        bounds
+    }
+
     fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
         let now = Instant::now();
 

core/embed/rust/src/ui/model_tt/component/dialog.rs

@@ -1,5 +1,5 @@
 use crate::ui::{
-    component::{base::ComponentExt, Child, Component, Event, EventCtx},
+    component::{Child, Component, Event, EventCtx},
     geometry::{Grid, Rect},
 };
 
@@ -21,17 +21,11 @@ where
     L: Component,
     R: Component,
 {
-    pub fn new(
-        area: Rect,
-        content: impl FnOnce(Rect) -> T,
-        left: impl FnOnce(Rect) -> L,
-        right: impl FnOnce(Rect) -> R,
-    ) -> Self {
-        let layout = DialogLayout::middle(area);
+    pub fn new(content: T, left: L, right: R) -> Self {
         Self {
-            content: content(layout.content).into_child(),
-            left: left(layout.left).into_child(),
-            right: right(layout.right).into_child(),
+            content: Child::new(content),
+            left: Child::new(left),
+            right: Child::new(right),
         }
     }
 }
@@ -44,6 +38,14 @@ where
 {
     type Msg = DialogMsg<T::Msg, L::Msg, R::Msg>;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        let layout = DialogLayout::middle(bounds);
+        self.content.place(layout.content);
+        self.left.place(layout.left);
+        self.right.place(layout.right);
+        bounds
+    }
+
     fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
         self.content
             .event(ctx, event)

core/embed/rust/src/ui/model_tt/component/frame.rs

@@ -1,6 +1,6 @@
 use super::theme;
 use crate::ui::{
-    component::{Child, Component, ComponentExt, Event, EventCtx},
+    component::{Child, Component, Event, EventCtx},
     display,
     geometry::{Insets, Rect},
 };
@@ -16,25 +16,13 @@ where
     T: Component,
     U: AsRef<[u8]>,
 {
-    pub fn new(area: Rect, title: U, content: impl FnOnce(Rect) -> T) -> Self {
-        let (title_area, content_area) = Self::areas(area);
+    pub fn new(title: U, content: T) -> Self {
         Self {
-            area: title_area,
             title,
-            content: content(content_area).into_child(),
+            area: Rect::zero(),
+            content: Child::new(content),
         }
     }
-
-    fn areas(area: Rect) -> (Rect, Rect) {
-        // Same as PageLayout::BUTTON_SPACE.
-        const TITLE_SPACE: i32 = 6;
-
-        let (title_area, content_area) = area.split_top(theme::FONT_BOLD.text_height());
-        let title_area = title_area.inset(Insets::left(theme::CONTENT_BORDER));
-        let content_area = content_area.inset(Insets::top(TITLE_SPACE));
-
-        (title_area, content_area)
-    }
 }
 
 impl<T, U> Component for Frame<T, U>
@@ -44,6 +32,21 @@ where
 {
     type Msg = T::Msg;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        // Same as PageLayout::BUTTON_SPACE.
+        const TITLE_SPACE: i32 = 6;
+
+        let (title_area, content_area) = bounds
+            .inset(theme::borders_scroll())
+            .split_top(theme::FONT_BOLD.text_height());
+        let title_area = title_area.inset(Insets::left(theme::CONTENT_BORDER));
+        let content_area = content_area.inset(Insets::top(TITLE_SPACE));
+
+        self.area = title_area;
+        self.content.place(content_area);
+        bounds
+    }
+
     fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
         self.content.event(ctx, event)
     }

core/embed/rust/src/ui/model_tt/component/keyboard/bip39.rs

@@ -27,15 +27,6 @@ pub struct Bip39Input {
 }
 
 impl MnemonicInput for Bip39Input {
-    fn new(area: Rect) -> Self {
-        Self {
-            button: Button::empty(area),
-            textbox: TextBox::empty(),
-            multi_tap: MultiTapKeyboard::new(),
-            suggested_word: None,
-        }
-    }
-
     /// Return the key set. Keys are further specified as indices into this
     /// array.
     fn keys() -> [&'static str; MNEMONIC_KEY_COUNT] {
@@ -78,6 +69,10 @@ impl MnemonicInput for Bip39Input {
 impl Component for Bip39Input {
     type Msg = MnemonicInputMsg;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        self.button.place(bounds)
+    }
+
     fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
         if self.multi_tap.is_timeout_event(event) {
             self.on_timeout(ctx)
@@ -146,6 +141,15 @@ impl Component for Bip39Input {
 }
 
 impl Bip39Input {
+    pub fn new() -> Self {
+        Self {
+            button: Button::empty(),
+            textbox: TextBox::empty(),
+            multi_tap: MultiTapKeyboard::new(),
+            suggested_word: None,
+        }
+    }
+
     /// Compute a bitmask of all letters contained in given key text. Lowest bit
     /// is 'a', second lowest 'b', etc.
     fn key_mask(key: usize) -> u32 {

core/embed/rust/src/ui/model_tt/component/keyboard/common.rs

@@ -199,16 +199,3 @@ impl<const L: usize> TextBox<L> {
         }
     }
 }
-
-/// Analogue to `[T]::enumerate().map(...)`.
-pub fn array_map_enumerate<T, U, const L: usize>(
-    array: [T; L],
-    mut func: impl FnMut(usize, T) -> U,
-) -> [U; L] {
-    let mut i = 0;
-    array.map(|t| {
-        let u = func(i, t);
-        i += 1;
-        u
-    })
-}

core/embed/rust/src/ui/model_tt/component/keyboard/mnemonic.rs

@@ -2,7 +2,7 @@ use crate::ui::{
     component::{Child, Component, Event, EventCtx, Label, Maybe},
     geometry::{Grid, Rect},
     model_tt::{
-        component::{keyboard::common::array_map_enumerate, Button, ButtonMsg},
+        component::{Button, ButtonMsg},
         theme,
     },
 };
@@ -28,45 +28,24 @@ impl<T> MnemonicKeyboard<T>
 where
     T: MnemonicInput,
 {
-    pub fn new(area: Rect, prompt: &'static [u8]) -> Self {
-        let grid = Grid::new(area, 3, 4);
-        let back_area = grid.row_col(0, 0);
-        let input_area = grid.row_col(0, 1).union(grid.row_col(0, 3));
-        let prompt_area = grid.row_col(0, 0).union(grid.row_col(0, 3));
-        let prompt_origin = prompt_area.top_left();
-
-        let input = T::new(input_area);
-        let keys = T::keys();
-
+    pub fn new(input: T, prompt: &'static [u8]) -> Self {
         Self {
             prompt: Child::new(Maybe::visible(
-                prompt_area,
                 theme::BG,
-                Label::left_aligned(prompt_origin, prompt, theme::label_default()),
+                Label::left_aligned(prompt, theme::label_default()),
             )),
             back: Child::new(Maybe::hidden(
-                back_area,
                 theme::BG,
-                Button::with_icon(back_area, theme::ICON_BACK).styled(theme::button_clear()),
+                Button::with_icon(theme::ICON_BACK).styled(theme::button_clear()),
             )),
-            input: Child::new(Maybe::hidden(input_area, theme::BG, input)),
-            keys: Self::key_buttons(keys, &grid, grid.cols), // Start in the second row.
+            input: Child::new(Maybe::hidden(theme::BG, input)),
+            keys: T::keys()
+                .map(str::as_bytes)
+                .map(Button::with_text)
+                .map(Child::new),
         }
     }
 
-    fn key_buttons(
-        keys: [&'static str; MNEMONIC_KEY_COUNT],
-        grid: &Grid,
-        offset: usize,
-    ) -> [Child<Button<&'static [u8]>>; MNEMONIC_KEY_COUNT] {
-        array_map_enumerate(keys, |index, text| {
-            Child::new(Button::with_text(
-                grid.cell(offset + index),
-                text.as_bytes(),
-            ))
-        })
-    }
-
     fn on_input_change(&mut self, ctx: &mut EventCtx) {
         self.toggle_key_buttons(ctx);
         self.toggle_prompt_or_input(ctx);
@@ -81,7 +60,7 @@ where
                 .inner()
                 .inner()
                 .can_key_press_lead_to_a_valid_word(key);
-            btn.mutate(ctx, |ctx, b| b.enabled(ctx, enabled));
+            btn.mutate(ctx, |ctx, b| b.enable_if(ctx, enabled));
         }
     }
 
@@ -104,6 +83,21 @@ where
 {
     type Msg = MnemonicKeyboardMsg;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        let grid = Grid::new(bounds, 3, 4);
+        let back_area = grid.row_col(0, 0);
+        let input_area = grid.row_col(0, 1).union(grid.row_col(0, 3));
+        let prompt_area = grid.row_col(0, 0).union(grid.row_col(0, 3));
+
+        self.prompt.place(prompt_area);
+        self.back.place(back_area);
+        self.input.place(input_area);
+        for (key, btn) in self.keys.iter_mut().enumerate() {
+            btn.place(grid.cell(key + grid.cols)); // Start in the second row.
+        }
+        bounds
+    }
+
     fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
         match self.input.event(ctx, event) {
             Some(MnemonicInputMsg::Confirmed) => {
@@ -145,7 +139,6 @@ where
 }
 
 pub trait MnemonicInput: Component<Msg = MnemonicInputMsg> {
-    fn new(area: Rect) -> Self;
     fn keys() -> [&'static str; MNEMONIC_KEY_COUNT];
     fn can_key_press_lead_to_a_valid_word(&self, key: usize) -> bool;
     fn on_key_click(&mut self, ctx: &mut EventCtx, key: usize);

core/embed/rust/src/ui/model_tt/component/keyboard/passphrase.rs

@@ -4,7 +4,7 @@ use crate::ui::{
     geometry::{Grid, Rect},
     model_tt::component::{
         button::{Button, ButtonContent, ButtonMsg::Clicked},
-        keyboard::common::{array_map_enumerate, MultiTapKeyboard, TextBox},
+        keyboard::common::{MultiTapKeyboard, TextBox},
         swipe::{Swipe, SwipeDirection},
         theme,
     },
@@ -38,50 +38,30 @@ const KEYBOARD: [[&str; KEY_COUNT]; PAGE_COUNT] = [
 const MAX_LENGTH: usize = 50;
 
 impl PassphraseKeyboard {
-    pub fn new(area: Rect) -> Self {
-        let input_area = Grid::new(area, 5, 1).row_col(0, 0);
-        let confirm_btn_area = Grid::new(area, 5, 3).cell(14);
-        let back_btn_area = Grid::new(area, 5, 3).cell(12);
-        let key_grid = Grid::new(area, 5, 3);
-
+    pub fn new() -> Self {
         Self {
-            page_swipe: Swipe::horizontal(area),
-            input: Input::new(input_area).into_child(),
-            confirm: Button::with_text(confirm_btn_area, "Confirm")
+            page_swipe: Swipe::horizontal(),
+            input: Input::new().into_child(),
+            confirm: Button::with_text("Confirm")
                 .styled(theme::button_confirm())
                 .into_child(),
-            back: Button::with_text(back_btn_area, "Back")
+            back: Button::with_text("Back")
                 .styled(theme::button_clear())
                 .into_child(),
-            keys: Self::generate_keyboard(&key_grid),
+            keys: KEYBOARD.map(|page| {
+                page.map(|text| {
+                    if text == " " {
+                        let icon = theme::ICON_SPACE;
+                        Child::new(Button::with_icon(icon))
+                    } else {
+                        Child::new(Button::with_text(text))
+                    }
+                })
+            }),
             key_page: STARTING_PAGE,
         }
     }
 
-    fn generate_keyboard(grid: &Grid) -> [[Child<Button<&'static str>>; KEY_COUNT]; PAGE_COUNT] {
-        array_map_enumerate(KEYBOARD, |_, page| {
-            array_map_enumerate(page, |key, text| Self::generate_key(grid, key, text))
-        })
-    }
-
-    fn generate_key(grid: &Grid, key: usize, text: &'static str) -> Child<Button<&'static str>> {
-        // Assign the keys in each page to buttons on a 5x3 grid, starting from the
-        // second row.
-        let area = grid.cell(if key < 9 {
-            // The grid has 3 columns, and we skip the first row.
-            key + 3
-        } else {
-            // For the last key (the "0" position) we skip one cell.
-            key + 1 + 3
-        });
-        if text == " " {
-            let icon = theme::ICON_SPACE;
-            Child::new(Button::with_icon(area, icon))
-        } else {
-            Child::new(Button::with_text(area, text))
-        }
-    }
-
     fn key_text(content: &ButtonContent<&'static str>) -> &'static str {
         match content {
             ButtonContent::Text(text) => text,
@@ -118,6 +98,31 @@ impl PassphraseKeyboard {
 impl Component for PassphraseKeyboard {
     type Msg = PassphraseKeyboardMsg;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        let input_area = Grid::new(bounds, 5, 1).row_col(0, 0);
+        let confirm_btn_area = Grid::new(bounds, 5, 3).cell(14);
+        let back_btn_area = Grid::new(bounds, 5, 3).cell(12);
+        let key_grid = Grid::new(bounds, 5, 3);
+
+        self.page_swipe.place(bounds);
+        self.input.place(input_area);
+        self.confirm.place(confirm_btn_area);
+        self.back.place(back_btn_area);
+        for (key, btn) in self.keys[self.key_page].iter_mut().enumerate() {
+            // Assign the keys in each page to buttons on a 5x3 grid, starting from the
+            // second row.
+            let area = key_grid.cell(if key < 9 {
+                // The grid has 3 columns, and we skip the first row.
+                key + 3
+            } else {
+                // For the last key (the "0" position) we skip one cell.
+                key + 1 + 3
+            });
+            btn.place(area);
+        }
+        bounds
+    }
+
     fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
         if self.input.inner().multi_tap.is_timeout_event(event) {
             self.input
@@ -180,9 +185,9 @@ struct Input {
 }
 
 impl Input {
-    fn new(area: Rect) -> Self {
+    fn new() -> Self {
         Self {
-            area,
+            area: Rect::zero(),
             textbox: TextBox::empty(),
             multi_tap: MultiTapKeyboard::new(),
         }
@@ -192,6 +197,11 @@ impl Input {
 impl Component for Input {
     type Msg = Never;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        self.area = bounds;
+        self.area
+    }
+
     fn event(&mut self, _ctx: &mut EventCtx, _event: Event) -> Option<Self::Msg> {
         None
     }

core/embed/rust/src/ui/model_tt/component/keyboard/pin.rs

@@ -37,99 +37,45 @@ pub struct PinKeyboard {
 }
 
 impl PinKeyboard {
-    pub fn new(area: Rect, major_prompt: &'static [u8], minor_prompt: &'static [u8]) -> Self {
+    pub fn new(major_prompt: &'static [u8], minor_prompt: &'static [u8]) -> Self {
         let digits = Vec::new();
-
-        // Prompts and PIN dots display.
-        let grid = if minor_prompt.is_empty() {
-            // Make the major prompt bigger if the minor one is empty.
-            Grid::new(area, 5, 1)
-        } else {
-            Grid::new(area, 6, 1)
-        };
-        let major_prompt = Label::centered(
-            grid.row_col(0, 0).center(),
-            major_prompt,
-            theme::label_default(),
-        );
-        let minor_prompt = Label::centered(
-            grid.row_col(0, 1).center(),
-            minor_prompt,
-            theme::label_default(),
-        );
-        let dots =
-            PinDots::new(grid.row_col(0, 0), digits.len(), theme::label_default()).into_child();
-
-        // Control buttons.
-        let grid = Grid::new(area, 5, 3);
-        let reset_btn = Button::with_text(grid.row_col(4, 0), "Reset")
-            .styled(theme::button_clear())
-            .into_child();
-        let cancel_btn = Button::with_icon(grid.row_col(4, 0), theme::ICON_CANCEL)
-            .styled(theme::button_cancel())
-            .into_child();
-        let confirm_btn = Button::with_icon(grid.row_col(4, 2), theme::ICON_CONFIRM)
-            .styled(theme::button_clear())
-            .into_child();
-
-        // PIN digit buttons.
-        let digit_btns = Self::generate_digit_buttons(&grid);
-
         Self {
+            major_prompt: Label::centered(major_prompt, theme::label_default()),
+            minor_prompt: Label::centered(minor_prompt, theme::label_default()),
+            dots: PinDots::new(digits.len(), theme::label_default()).into_child(),
+            reset_btn: Button::with_text("Reset")
+                .styled(theme::button_clear())
+                .into_child(),
+            cancel_btn: Button::with_icon(theme::ICON_CANCEL)
+                .styled(theme::button_cancel())
+                .into_child(),
+            confirm_btn: Button::with_icon(theme::ICON_CONFIRM)
+                .styled(theme::button_clear())
+                .into_child(),
+            digit_btns: Self::generate_digit_buttons(),
             digits,
-            major_prompt,
-            minor_prompt,
-            dots,
-            reset_btn,
-            cancel_btn,
-            confirm_btn,
-            digit_btns,
         }
     }
 
-    fn generate_digit_buttons(grid: &Grid) -> [Child<Button<&'static str>>; DIGIT_COUNT] {
+    fn generate_digit_buttons() -> [Child<Button<&'static str>>; DIGIT_COUNT] {
         // Generate a random sequence of digits from 0 to 9.
         let mut digits = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"];
         random::shuffle(&mut digits);
-
-        // Assign the digits to buttons on a 5x3 grid, starting from the second row.
-        let btn = |i| {
-            let area = grid.cell(if i < 9 {
-                // The grid has 3 columns, and we skip the first row.
-                i + 3
-            } else {
-                // For the last key (the "0" position) we skip one cell.
-                i + 1 + 3
-            });
-            let text = digits[i];
-            Child::new(Button::with_text(area, text))
-        };
-        [
-            btn(0),
-            btn(1),
-            btn(2),
-            btn(3),
-            btn(4),
-            btn(5),
-            btn(6),
-            btn(7),
-            btn(8),
-            btn(9),
-        ]
+        digits.map(Button::with_text).map(Child::new)
     }
 
     fn pin_modified(&mut self, ctx: &mut EventCtx) {
         let is_full = self.digits.is_full();
         for btn in &mut self.digit_btns {
-            btn.mutate(ctx, |ctx, btn| btn.enabled(ctx, !is_full));
+            btn.mutate(ctx, |ctx, btn| btn.enable_if(ctx, !is_full));
         }
         let is_empty = self.digits.is_empty();
         self.reset_btn
-            .mutate(ctx, |ctx, btn| btn.enabled(ctx, !is_empty));
+            .mutate(ctx, |ctx, btn| btn.enable_if(ctx, !is_empty));
         self.cancel_btn
-            .mutate(ctx, |ctx, btn| btn.enabled(ctx, is_empty));
+            .mutate(ctx, |ctx, btn| btn.enable_if(ctx, is_empty));
         self.confirm_btn
-            .mutate(ctx, |ctx, btn| btn.enabled(ctx, !is_empty));
+            .mutate(ctx, |ctx, btn| btn.enable_if(ctx, !is_empty));
         let digit_count = self.digits.len();
         self.dots
             .mutate(ctx, |ctx, dots| dots.update(ctx, digit_count));
@@ -143,6 +89,40 @@ impl PinKeyboard {
 impl Component for PinKeyboard {
     type Msg = PinKeyboardMsg;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        // Prompts and PIN dots display.
+        let grid = if self.minor_prompt.text().is_empty() {
+            // Make the major prompt bigger if the minor one is empty.
+            Grid::new(bounds, 5, 1)
+        } else {
+            Grid::new(bounds, 6, 1)
+        };
+        self.major_prompt.place(grid.row_col(0, 0));
+        self.minor_prompt.place(grid.row_col(0, 1));
+        self.dots.place(grid.row_col(0, 0));
+
+        // Control buttons.
+        let grid = Grid::new(bounds, 5, 3);
+        self.reset_btn.place(grid.row_col(4, 0));
+        self.cancel_btn.place(grid.row_col(4, 0));
+        self.confirm_btn.place(grid.row_col(4, 2));
+
+        // Digit buttons.
+        for (i, btn) in self.digit_btns.iter_mut().enumerate() {
+            // Assign the digits to buttons on a 5x3 grid, starting from the second row.
+            let area = grid.cell(if i < 9 {
+                // The grid has 3 columns, and we skip the first row.
+                i + 3
+            } else {
+                // For the last key (the "0" position) we skip one cell.
+                i + 1 + 3
+            });
+            btn.place(area);
+        }
+
+        bounds
+    }
+
     fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
         if let Some(Clicked) = self.confirm_btn.event(ctx, event) {
             return Some(PinKeyboardMsg::Confirmed);
@@ -196,16 +176,16 @@ impl PinDots {
     const DOT: i32 = 10;
     const PADDING: i32 = 4;
 
-    fn new(area: Rect, digit_count: usize, style: LabelStyle) -> Self {
+    fn new(digit_count: usize, style: LabelStyle) -> Self {
         Self {
-            area,
             style,
             digit_count,
+            area: Rect::zero(),
         }
     }
 
     fn update(&mut self, ctx: &mut EventCtx, digit_count: usize) {
-        if digit_count != self.digit_count {
+        if self.digit_count != digit_count {
             self.digit_count = digit_count;
             ctx.request_paint();
         }
@@ -215,6 +195,11 @@ impl PinDots {
 impl Component for PinDots {
     type Msg = Never;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        self.area = bounds;
+        self.area
+    }
+
     fn event(&mut self, _ctx: &mut EventCtx, _event: Event) -> Option<Self::Msg> {
         None
     }

core/embed/rust/src/ui/model_tt/component/keyboard/slip39.rs

@@ -33,16 +33,6 @@ pub struct Slip39Input {
 }
 
 impl MnemonicInput for Slip39Input {
-    fn new(area: Rect) -> Self {
-        Self {
-            button: Button::empty(area),
-            textbox: TextBox::empty(),
-            multi_tap: MultiTapKeyboard::new(),
-            final_word: None,
-            input_mask: Slip39Mask::full(),
-        }
-    }
-
     /// Return the key set. Keys are further specified as indices into this
     /// array.
     fn keys() -> [&'static str; MNEMONIC_KEY_COUNT] {
@@ -94,6 +84,10 @@ impl MnemonicInput for Slip39Input {
 impl Component for Slip39Input {
     type Msg = MnemonicInputMsg;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        self.button.place(bounds)
+    }
+
     fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
         if self.multi_tap.is_timeout_event(event) {
             // Timeout occurred. Reset the pending key.
@@ -180,6 +174,16 @@ impl Component for Slip39Input {
 }
 
 impl Slip39Input {
+    pub fn new() -> Self {
+        Self {
+            button: Button::empty(),
+            textbox: TextBox::empty(),
+            multi_tap: MultiTapKeyboard::new(),
+            final_word: None,
+            input_mask: Slip39Mask::full(),
+        }
+    }
+
     /// Convert a key index into the key digit. This is what we push into the
     /// input buffer.
     ///

core/embed/rust/src/ui/model_tt/component/loader.rs

@@ -4,7 +4,7 @@ use crate::{
         animation::Animation,
         component::{Component, Event, EventCtx},
         display::{self, Color},
-        geometry::Offset,
+        geometry::{Offset, Rect},
     },
 };
 
@@ -111,6 +111,11 @@ impl Loader {
 impl Component for Loader {
     type Msg = LoaderMsg;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        // TODO: Return the correct size.
+        bounds
+    }
+
     fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
         let now = Instant::now();
 

core/embed/rust/src/ui/model_tt/component/page.rs

@@ -3,7 +3,7 @@ use crate::ui::{
         base::ComponentExt, paginated::PageMsg, Component, Event, EventCtx, Never, Pad, Paginate,
     },
     display::{self, Color},
-    geometry::{Dimensions, LinearLayout, Offset, Rect},
+    geometry::{LinearPlacement, Offset, Rect},
 };
 
 use super::{theme, Button, Swipe, SwipeDirection};
@@ -21,58 +21,31 @@ impl<T, U> SwipePage<T, U>
 where
     T: Paginate,
     T: Component,
-    T: Dimensions,
     U: Component,
 {
-    pub fn new(
-        area: Rect,
-        background: Color,
-        content: impl FnOnce(Rect) -> T,
-        controls: impl FnOnce(Rect) -> U,
-    ) -> Self {
-        let layout = PageLayout::new(area);
-        let mut content = Self::make_content(&layout, content);
-
-        // Always start at the first page.
-        let scrollbar = ScrollBar::vertical_right(layout.scrollbar, content.page_count(), 0);
-
-        let swipe = Self::make_swipe(area, &scrollbar);
-        let pad = Pad::with_background(area, background);
+    pub fn new(content: T, buttons: U, background: Color) -> Self {
         Self {
             content,
-            buttons: controls(layout.buttons),
-            scrollbar,
-            swipe,
-            pad,
+            buttons,
+            scrollbar: ScrollBar::vertical(),
+            swipe: Swipe::new(),
+            pad: Pad::with_background(background),
             fade: None,
         }
     }
 
-    fn make_swipe(area: Rect, scrollbar: &ScrollBar) -> Swipe {
-        let mut swipe = Swipe::new(area);
-        swipe.allow_up = scrollbar.has_next_page();
-        swipe.allow_down = scrollbar.has_previous_page();
-        swipe
+    fn setup_swipe(&mut self) {
+        self.swipe.allow_up = self.scrollbar.has_next_page();
+        self.swipe.allow_down = self.scrollbar.has_previous_page();
     }
 
-    fn make_content(layout: &PageLayout, content: impl FnOnce(Rect) -> T) -> T {
-        // Check if content fits on single page.
-        let mut content = content(layout.content_single_page);
-        if content.page_count() > 1 {
-            // Reduce area to make space for scrollbar if it doesn't fit.
-            content.set_area(layout.content);
-        }
-        content.change_page(0);
-        content
-    }
-
-    fn change_page(&mut self, ctx: &mut EventCtx, page: usize) {
-        // Adjust the swipe parameters.
-        self.swipe = Self::make_swipe(self.swipe.area, &self.scrollbar);
+    fn on_page_change(&mut self, ctx: &mut EventCtx) {
+        // Adjust the swipe parameters according to the scrollbar.
+        self.setup_swipe();
 
         // Change the page in the content, make sure it gets completely repainted and
         // clear the background under it.
-        self.content.change_page(page);
+        self.content.change_page(self.scrollbar.active_page);
         self.content.request_complete_repaint(ctx);
         self.pad.clear();
 
@@ -96,24 +69,52 @@ impl<T, U> Component for SwipePage<T, U>
 where
     T: Paginate,
     T: Component,
-    T: Dimensions,
     U: Component,
 {
     type Msg = PageMsg<T::Msg, U::Msg>;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        let layout = PageLayout::new(bounds);
+        self.pad.place(bounds);
+        self.swipe.place(bounds);
+        self.buttons.place(layout.buttons);
+        self.scrollbar.place(layout.scrollbar);
+
+        // Layout the content. Try to fit it on a single page first, and reduce the area
+        // to make space for a scrollbar if it doesn't fit.
+        self.content.place(layout.content_single_page);
+        let page_count = {
+            let count = self.content.page_count();
+            if count > 1 {
+                self.content.place(layout.content);
+                self.content.page_count() // Make sure to re-count it with the
+                                          // new size.
+            } else {
+                count // Content fits on a single page.
+            }
+        };
+
+        // Now that we finally have the page count, we can setup the scrollbar and the
+        // swiper.
+        self.scrollbar.set_count_and_active_page(page_count, 0);
+        self.setup_swipe();
+
+        bounds
+    }
+
     fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
         if let Some(swipe) = self.swipe.event(ctx, event) {
             match swipe {
                 SwipeDirection::Up => {
                     // Scroll down, if possible.
                     self.scrollbar.go_to_next_page();
-                    self.change_page(ctx, self.scrollbar.active_page);
+                    self.on_page_change(ctx);
                     return None;
                 }
                 SwipeDirection::Down => {
                     // Scroll up, if possible.
                     self.scrollbar.go_to_previous_page();
-                    self.change_page(ctx, self.scrollbar.active_page);
+                    self.on_page_change(ctx);
                     return None;
                 }
                 _ => {
@@ -193,14 +194,19 @@ impl ScrollBar {
     const ICON_UP: &'static [u8] = include_res!("model_tt/res/scroll-up.toif");
     const ICON_DOWN: &'static [u8] = include_res!("model_tt/res/scroll-down.toif");
 
-    pub fn vertical_right(area: Rect, page_count: usize, active_page: usize) -> Self {
+    pub fn vertical() -> Self {
         Self {
-            area,
-            page_count,
-            active_page,
+            area: Rect::zero(),
+            page_count: 0,
+            active_page: 0,
         }
     }
 
+    pub fn set_count_and_active_page(&mut self, page_count: usize, active_page: usize) {
+        self.page_count = page_count;
+        self.active_page = active_page;
+    }
+
     pub fn has_pages(&self) -> bool {
         self.page_count > 1
     }
@@ -229,12 +235,17 @@ impl ScrollBar {
 impl Component for ScrollBar {
     type Msg = Never;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        self.area = bounds;
+        self.area
+    }
+
     fn event(&mut self, _ctx: &mut EventCtx, _event: Event) -> Option<Self::Msg> {
         None
     }
 
     fn paint(&mut self) {
-        let layout = LinearLayout::vertical()
+        let layout = LinearPlacement::vertical()
             .align_at_center()
             .with_spacing(Self::DOT_INTERVAL);
 
@@ -315,7 +326,6 @@ mod tests {
         trace::Trace,
         ui::{
             component::{text::paragraphs::Paragraphs, Empty},
-            display,
             geometry::Point,
             model_tt::{event::TouchEvent, theme},
         },
@@ -357,12 +367,8 @@ mod tests {
 
     #[test]
     fn paragraphs_empty() {
-        let mut page = SwipePage::new(
-            display::screen(),
-            theme::BG,
-            |area| Paragraphs::<&[u8]>::new(area),
-            |_| Empty,
-        );
+        let mut page = SwipePage::new(Paragraphs::<&str>::new(), Empty, theme::BG);
+        page.place(display::screen());
 
         let expected =
             "<SwipePage active_page:0 page_count:1 content:<Paragraphs > buttons:<Empty > >";
@@ -377,21 +383,19 @@ mod tests {
     #[test]
     fn paragraphs_single() {
         let mut page = SwipePage::new(
-            display::screen(),
+            Paragraphs::new()
+                .add::<theme::TTDefaultText>(
+                    theme::FONT_NORMAL,
+                    "This is the first paragraph and it should fit on the screen entirely.",
+                )
+                .add::<theme::TTDefaultText>(
+                    theme::FONT_BOLD,
+                    "Second, bold, paragraph should also fit on the screen whole I think.",
+                ),
+            Empty,
             theme::BG,
-            |area| {
-                Paragraphs::new(area)
-                    .add::<theme::TTDefaultText>(
-                        theme::FONT_NORMAL,
-                        "This is the first paragraph and it should fit on the screen entirely.",
-                    )
-                    .add::<theme::TTDefaultText>(
-                        theme::FONT_BOLD,
-                        "Second, bold, paragraph should also fit on the screen whole I think.",
-                    )
-            },
-            |_| Empty,
         );
+        page.place(display::screen());
 
         let expected = "<SwipePage active_page:0 page_count:1 content:<Paragraphs This is the first paragraph\nand it should fit on the\nscreen entirely.\nSecond, bold, paragraph\nshould also fit on the\nscreen whole I think.\n> buttons:<Empty > >";
 
@@ -405,17 +409,15 @@ mod tests {
     #[test]
     fn paragraphs_one_long() {
         let mut page = SwipePage::new(
-            display::screen(),
+            Paragraphs::new()
+                .add::<theme::TTDefaultText>(
+                    theme::FONT_BOLD,
+                    "This is somewhat long paragraph that goes on and on and on and on and on and will definitely not fit on just a single screen. You have to swipe a bit to see all the text it contains I guess. There's just so much letters in it.",
+                ),
+            Empty,
             theme::BG,
-            |area| {
-                Paragraphs::new(area)
-                    .add::<theme::TTDefaultText>(
-                        theme::FONT_BOLD,
-                        "This is somewhat long paragraph that goes on and on and on and on and on and will definitely not fit on just a single screen. You have to swipe a bit to see all the text it contains I guess. There's just so much letters in it.",
-                    )
-            },
-            |_| Empty,
         );
+        page.place(display::screen());
 
         let expected1 = "<SwipePage active_page:0 page_count:2 content:<Paragraphs This is somewhat long\nparagraph that goes\non and on and on and\non and on and will\ndefinitely not fit on\njust a single screen.\nYou have to swipe a bit\nto see all the text it...\n> buttons:<Empty > >";
         let expected2 = "<SwipePage active_page:1 page_count:2 content:<Paragraphs contains I guess.\nThere's just so much\nletters in it.\n> buttons:<Empty > >";
@@ -434,25 +436,23 @@ mod tests {
     #[test]
     fn paragraphs_three_long() {
         let mut page = SwipePage::new(
-            display::screen(),
+            Paragraphs::new()
+                .add::<theme::TTDefaultText>(
+                    theme::FONT_BOLD,
+                    "This paragraph is using a bold font. It doesn't need to be all that long.",
+                )
+                .add::<theme::TTDefaultText>(
+                    theme::FONT_MONO,
+                    "And this one is using MONO. Monospace is nice for numbers, they have the same width and can be scanned quickly. Even if they span several pages or something.",
+                )
+                .add::<theme::TTDefaultText>(
+                    theme::FONT_BOLD,
+                    "Let's add another one for a good measure. This one should overflow all the way to the third page with a bit of luck.",
+                ),
+            Empty,
             theme::BG,
-            |area| {
-                Paragraphs::new(area)
-                    .add::<theme::TTDefaultText>(
-                        theme::FONT_BOLD,
-                        "This paragraph is using a bold font. It doesn't need to be all that long.",
-                    )
-                    .add::<theme::TTDefaultText>(
-                        theme::FONT_MONO,
-                        "And this one is using MONO. Monospace is nice for numbers, they have the same width and can be scanned quickly. Even if they span several pages or something.",
-                    )
-                    .add::<theme::TTDefaultText>(
-                        theme::FONT_BOLD,
-                        "Let's add another one for a good measure. This one should overflow all the way to the third page with a bit of luck.",
-                    )
-            },
-            |_| Empty,
         );
+        page.place(display::screen());
 
         let expected1 = "<SwipePage active_page:0 page_count:3 content:<Paragraphs This paragraph is\nusing a bold font. It\ndoesn't need to be all\nthat long.\nAnd this one is\nusing MONO.\nMonospace is nice\nfor numbers, they...\n> buttons:<Empty > >";
         let expected2 = "<SwipePage active_page:1 page_count:3 content:<Paragraphs have the same\nwidth and can be\nscanned quickly.\nEven if they span\nseveral pages or\nsomething.\nLet's add another one\nfor a good measure....\n> buttons:<Empty > >";

core/embed/rust/src/ui/model_tt/component/swipe.rs

@@ -28,9 +28,9 @@ impl Swipe {
     const DISTANCE: i32 = 120;
     const THRESHOLD: f32 = 0.3;
 
-    pub fn new(area: Rect) -> Self {
+    pub fn new() -> Self {
         Self {
-            area,
+            area: Rect::zero(),
             allow_up: false,
             allow_down: false,
             allow_left: false,
@@ -41,12 +41,12 @@ impl Swipe {
         }
     }
 
-    pub fn vertical(area: Rect) -> Self {
-        Self::new(area).up().down()
+    pub fn vertical() -> Self {
+        Self::new().up().down()
     }
 
-    pub fn horizontal(area: Rect) -> Self {
-        Self::new(area).left().right()
+    pub fn horizontal() -> Self {
+        Self::new().left().right()
     }
 
     pub fn up(mut self) -> Self {
@@ -88,6 +88,11 @@ impl Swipe {
 impl Component for Swipe {
     type Msg = SwipeDirection;
 
+    fn place(&mut self, bounds: Rect) -> Rect {
+        self.area = bounds;
+        self.area
+    }
+
     fn event(&mut self, _ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
         if !self.is_active() {
             return None;

core/embed/rust/src/ui/model_tt/layout.rs

@@ -4,8 +4,7 @@ use crate::{
     error::Error,
     micropython::{buffer::Buffer, map::Map, obj::Obj, qstr::Qstr},
     ui::{
-        component::{base::ComponentExt, text::paragraphs::Paragraphs, Child, FormattedText},
-        display,
+        component::{base::ComponentExt, text::paragraphs::Paragraphs, FormattedText},
         layout::obj::LayoutObj,
     },
     util,
@@ -52,13 +51,12 @@ where
 #[no_mangle]
 extern "C" fn ui_layout_new_example(_param: Obj) -> Obj {
     let block = move || {
-        let layout = LayoutObj::new(HoldToConfirm::new(display::screen(), |area| {
+        let layout = LayoutObj::new(HoldToConfirm::new(
             FormattedText::new::<theme::TTDefaultText>(
-                area,
                 "Testing text layout, with some text, and some more text. And {param}",
             )
-            .with(b"param", b"parameters!")
-        }))?;
+            .with(b"param", b"parameters!"),
+        ))?;
         Ok(layout.into())
     };
     unsafe { util::try_or_raise(block) }
@@ -78,41 +76,32 @@ extern "C" fn ui_layout_new_confirm_action(
         let verb: Option<Buffer> = kwargs.get(Qstr::MP_QSTR_verb)?.try_into_option()?;
         let reverse: bool = kwargs.get(Qstr::MP_QSTR_reverse)?.try_into()?;
 
+        let paragraphs = {
+            let action = action.unwrap_or_default();
+            let description = description.unwrap_or_default();
+            let mut paragraphs = Paragraphs::new();
+            if !reverse {
+                paragraphs = paragraphs
+                    .add::<theme::TTDefaultText>(theme::FONT_BOLD, action)
+                    .add::<theme::TTDefaultText>(theme::FONT_NORMAL, description);
+            } else {
+                paragraphs = paragraphs
+                    .add::<theme::TTDefaultText>(theme::FONT_NORMAL, description)
+                    .add::<theme::TTDefaultText>(theme::FONT_BOLD, action);
+            }
+            paragraphs
+        };
+
+        let buttons = Button::left_right(
+            Button::with_icon(theme::ICON_CANCEL),
+            |msg| (matches!(msg, ButtonMsg::Clicked)).then(|| false),
+            Button::with_text(verb.unwrap_or_else(|| "CONFIRM".into()))
+                .styled(theme::button_confirm()),
+            |msg| (matches!(msg, ButtonMsg::Clicked)).then(|| true),
+        );
+
         let obj = LayoutObj::new(
-            Frame::new(theme::borders(), title, |area| {
-                SwipePage::new(
-                    area,
-                    theme::BG,
-                    |area| {
-                        let action = action.unwrap_or("".into());
-                        let description = description.unwrap_or("".into());
-                        let mut para = Paragraphs::new(area);
-                        if !reverse {
-                            para = para
-                                .add::<theme::TTDefaultText>(theme::FONT_BOLD, action)
-                                .add::<theme::TTDefaultText>(theme::FONT_NORMAL, description);
-                        } else {
-                            para = para
-                                .add::<theme::TTDefaultText>(theme::FONT_NORMAL, description)
-                                .add::<theme::TTDefaultText>(theme::FONT_BOLD, action);
-                        }
-                        para
-                    },
-                    |area| {
-                        Button::array2(
-                            area,
-                            |area| Button::with_icon(area, theme::ICON_CANCEL),
-                            |msg| (matches!(msg, ButtonMsg::Clicked)).then(|| false),
-                            |area| {
-                                Button::with_text(area, verb.unwrap_or("CONFIRM".into()))
-                                    .styled(theme::button_confirm())
-                            },
-                            |msg| (matches!(msg, ButtonMsg::Clicked)).then(|| true),
-                        )
-                    },
-                )
-            })
-            .into_child(),
+            Frame::new(title, SwipePage::new(paragraphs, buttons, theme::BG)).into_child(),
         )?;
         Ok(obj.into())
     };
@@ -123,7 +112,11 @@ extern "C" fn ui_layout_new_confirm_action(
 mod tests {
     use crate::{
         trace::Trace,
-        ui::model_tt::component::{Button, Dialog},
+        ui::{
+            component::Component,
+            display,
+            model_tt::component::{Button, Dialog},
+        },
     };
 
     use super::*;
@@ -136,18 +129,15 @@ mod tests {
 
     #[test]
     fn trace_example_layout() {
-        let layout = Child::new(Dialog::new(
-            display::screen(),
-            |area| {
-                FormattedText::new::<theme::TTDefaultText>(
-                    area,
-                    "Testing text layout, with some text, and some more text. And {param}",
-                )
-                .with(b"param", b"parameters!")
-            },
-            |area| Button::with_text(area, b"Left"),
-            |area| Button::with_text(area, b"Right"),
-        ));
+        let mut layout = Dialog::new(
+            FormattedText::new::<theme::TTDefaultText>(
+                "Testing text layout, with some text, and some more text. And {param}",
+            )
+            .with(b"param", b"parameters!"),
+            Button::with_text(b"Left"),
+            Button::with_text(b"Right"),
+        );
+        layout.place(display::screen());
         assert_eq!(
             trace(&layout),
             "<Dialog content:<Text content:Testing text layout, with\nsome text, and some more\ntext. And parameters! > left:<Button text:Left > right:<Button text:Right > >",

core/embed/rust/src/ui/model_tt/theme.rs

@@ -1,7 +1,7 @@
 use crate::ui::{
     component::{label::LabelStyle, text::layout::DefaultTextTheme},
-    display::{self, Color, Font},
-    geometry::{Insets, Rect},
+    display::{Color, Font},
+    geometry::Insets,
 };
 
 use super::component::{ButtonStyle, ButtonStyleSheet, LoaderStyle, LoaderStyleSheet};
@@ -165,6 +165,6 @@ pub const CONTENT_BORDER: i32 = 5;
 /// |  +----+  |
 /// |    14    |
 /// +----------+
-pub fn borders() -> Rect {
-    display::screen().inset(Insets::new(13, 5, 14, 10))
+pub fn borders_scroll() -> Insets {
+    Insets::new(13, 5, 14, 10)
 }