WIP - scrollbar showing at most 5 dots of different sizes

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

@@ -188,11 +188,11 @@ where
     fn place(&mut self, bounds: Rect) -> Rect {
         let (content_area, button_area) = bounds.split_bottom(theme::BUTTON_HEIGHT);
         let content_area = content_area.inset(Insets::top(1));
-        // Do not pad the button area nor the scrollbar, leave it to them
+        // Do not pad the button area nor the scrollbar, leave it to them.
         self.pad.place(content_area);
         self.content.place(content_area);
         // Need to be called here, only after content is placed
-        // and we can calculate the page count
+        // and we can calculate the page count.
         let page_count = self.content.inner_mut().page_count();
         self.scrollbar.inner_mut().set_page_count(page_count);
         self.set_buttons_for_initial_page(page_count);
@@ -201,18 +201,21 @@ where
         // Put it into its dedicated area when parent component already chose it,
         // otherwise place it into the right top of the content.
         if self.show_scrollbar {
-            let scrollbar_area = if let Some(scrollbar_area) = self.parent_scrollbar_area {
+            let max_scrollbar_area = if let Some(scrollbar_area) = self.parent_scrollbar_area {
                 scrollbar_area
             } else {
-                Rect::from_top_right_and_size(
+                content_area
-                    content_area.top_right(),
+            };
+            // Occupying as little space as possible (according to the number of pages),
+            // aligning to the right.
+            let min_scrollbar_area = Rect::from_top_right_and_size(
+                max_scrollbar_area.top_right(),
                 Offset::new(
-                        -self.scrollbar.inner().overall_width(),
+                    self.scrollbar.inner().overall_width(),
                     ScrollBar::MAX_DOT_SIZE,
                 ),
-                )
+            );
-            };
+            self.scrollbar.place(min_scrollbar_area);
-            self.scrollbar.place(scrollbar_area);
         }
 
         self.buttons.place(button_area);

core/embed/rust/src/ui/model_tr/component/pin.rs

@@ -28,6 +28,7 @@ const CHOICE_LENGTH: usize = 13;
 const DELETE_INDEX: usize = 0;
 const SHOW_INDEX: usize = 1;
 const PROMPT_INDEX: usize = 2;
+const NUMBER_START_INDEX: usize = 3;
 const CHOICES: [&str; CHOICE_LENGTH] = [
     "DELETE",
     "SHOW",
@@ -100,7 +101,7 @@ impl PinEntry {
         Self {
             // Starting at the digit 0
             choice_page: ChoicePage::new(choices)
-                .with_initial_page_counter(PROMPT_INDEX as u8 + 1)
+                .with_initial_page_counter(NUMBER_START_INDEX as u8)
                 .with_carousel(true),
             pin_dots: Child::new(ChangingTextLine::center_mono(String::new())),
             show_real_pin: false,
@@ -188,7 +189,7 @@ impl Component for PinEntry {
                         self.update_pin_dots(ctx);
                         // Choosing any random digit to be shown next
                         let new_page_counter = random::uniform_between(
-                            PROMPT_INDEX as u32 + 1,
+                            NUMBER_START_INDEX as u32,
                             (CHOICE_LENGTH - 1) as u32,
                         );
                         self.choice_page

core/embed/rust/src/ui/model_tr/component/scrollbar.rs

@@ -5,6 +5,8 @@ use crate::ui::{
     model_tr::theme,
 };
 
+use heapless::Vec;
+
 /// Scrollbar to be painted horizontally at the top right of the screen.
 pub struct ScrollBar {
     area: Rect,
@@ -13,15 +15,25 @@ pub struct ScrollBar {
     pub active_page: usize,
 }
 
+/// Carrying the appearance of the scrollbar dot.
+#[derive(Debug)]
+enum DotType {
+    BigFull,
+    Big,
+    Middle,
+    Small,
+}
+
+/// How many dots at most will there be
+const MAX_DOTS: usize = 5;
+
 impl ScrollBar {
-    /// How many dots at most will there be
-    pub const MAX_DOTS: i16 = 5;
     /// Maximum size (width/height) of a dot
     pub const MAX_DOT_SIZE: i16 = 5;
     /// Distance between two dots
     pub const DOTS_DISTANCE: i16 = 2;
     pub const DOTS_INTERVAL: i16 = Self::MAX_DOT_SIZE + Self::DOTS_DISTANCE;
-    pub const MAX_WIDTH: i16 = Self::DOTS_INTERVAL * Self::MAX_DOTS - Self::DOTS_DISTANCE;
+    pub const MAX_WIDTH: i16 = Self::DOTS_INTERVAL * MAX_DOTS as i16 - Self::DOTS_DISTANCE;
 
     pub fn new(page_count: usize) -> Self {
         Self {
@@ -37,6 +49,7 @@ impl ScrollBar {
         Self::new(0)
     }
 
+    /// The width the scrollbar will really occupy.
     pub fn overall_width(&self) -> i16 {
         Self::DOTS_INTERVAL * self.page_count as i16 - Self::DOTS_DISTANCE
     }
@@ -68,10 +81,12 @@ impl ScrollBar {
     /// Create a (seemingly circular) dot given its top left point.
     /// Make it full when it is active, otherwise paint just the perimeter and
     /// leave center empty.
-    fn paint_dot(&self, active: bool, top_right: Point) {
+    fn paint_dot(&self, dot_type: &DotType, top_right: Point) {
         let full_square =
             Rect::from_top_right_and_size(top_right, Offset::uniform(Self::MAX_DOT_SIZE));
 
+        match dot_type {
+            DotType::BigFull | DotType::Big => {
                 // FG - painting the full square
                 display::rect_fill(full_square, theme::FG);
 
@@ -80,21 +95,115 @@ impl ScrollBar {
                     display::paint_point(p, theme::BG);
                 }
 
-        // BG - erasing the middle when not active
+                // BG - erasing the middle when not full
-        if !active {
+                if matches!(dot_type, DotType::Big) {
                     display::rect_fill(full_square.shrink(1), theme::BG)
                 }
             }
+            DotType::Middle => {
+                let middle_square = full_square.shrink(1);
 
-    /// Drawing the dots horizontally and aligning to the right
+                // FG - painting the middle square
+                display::rect_fill(middle_square, theme::FG);
+
+                // BG - erase four corners
+                for p in middle_square.corner_points().iter() {
+                    display::paint_point(p, theme::BG);
+                }
+
+                // BG - erasing the middle
+                display::rect_fill(middle_square.shrink(1), theme::BG)
+            }
+            DotType::Small => {
+                // FG - painting the small square
+                display::rect_fill(full_square.shrink(2), theme::FG)
+            }
+        }
+    }
+
+    /// Get a sequence of dots to be drawn, with specifying their appearance.
+    /// Painting only big dots in case of 2 and 3 pages,
+    /// three big and 1 middle in case of 4 pages,
+    /// and three big, one middle and one small in case of 5 and more pages.
+    fn get_drawable_dots(&self) -> Vec<DotType, MAX_DOTS> {
+        let mut dots = Vec::new();
+
+        match self.page_count {
+            small_num if small_num < 4 => {
+                for i in 0..self.page_count {
+                    if i == self.active_page {
+                        unwrap!(dots.push(DotType::BigFull));
+                    } else {
+                        unwrap!(dots.push(DotType::Big));
+                    }
+                }
+            }
+            4 => {
+                match self.active_page {
+                    0 => unwrap!(dots.push(DotType::BigFull)),
+                    1 => unwrap!(dots.push(DotType::Big)),
+                    _ => unwrap!(dots.push(DotType::Middle)),
+                };
+                match self.active_page {
+                    1 => unwrap!(dots.push(DotType::BigFull)),
+                    _ => unwrap!(dots.push(DotType::Big)),
+                };
+                match self.active_page {
+                    2 => unwrap!(dots.push(DotType::BigFull)),
+                    _ => unwrap!(dots.push(DotType::Big)),
+                };
+                match self.active_page {
+                    3 => unwrap!(dots.push(DotType::BigFull)),
+                    2 => unwrap!(dots.push(DotType::Big)),
+                    _ => unwrap!(dots.push(DotType::Middle)),
+                };
+            }
+            _ => {
+                let full_dot_index = match self.active_page {
+                    0 => 0,
+                    1 => 1,
+                    last if last == self.page_count - 1 => 4,
+                    last_but_one if last_but_one == self.page_count - 2 => 3,
+                    _ => 2,
+                };
+                match full_dot_index {
+                    0 => unwrap!(dots.push(DotType::BigFull)),
+                    1 => unwrap!(dots.push(DotType::Big)),
+                    2 => unwrap!(dots.push(DotType::Middle)),
+                    _ => unwrap!(dots.push(DotType::Small)),
+                };
+                match full_dot_index {
+                    0 => unwrap!(dots.push(DotType::Big)),
+                    1 => unwrap!(dots.push(DotType::BigFull)),
+                    2 => unwrap!(dots.push(DotType::Big)),
+                    _ => unwrap!(dots.push(DotType::Middle)),
+                };
+                match full_dot_index {
+                    2 => unwrap!(dots.push(DotType::BigFull)),
+                    _ => unwrap!(dots.push(DotType::Big)),
+                };
+                match full_dot_index {
+                    0 | 1 => unwrap!(dots.push(DotType::Middle)),
+                    3 => unwrap!(dots.push(DotType::BigFull)),
+                    _ => unwrap!(dots.push(DotType::Big)),
+                };
+                match full_dot_index {
+                    0 | 1 => unwrap!(dots.push(DotType::Small)),
+                    2 => unwrap!(dots.push(DotType::Middle)),
+                    3 => unwrap!(dots.push(DotType::Big)),
+                    _ => unwrap!(dots.push(DotType::BigFull)),
+                };
+            }
+        }
+        dots
+    }
+
+    /// Drawing the dots horizontally and aligning to the right.
     fn paint_horizontal(&mut self) {
         let mut top_right = self.area.top_right();
-        // TODO: implement smaller dots - two more sizes
+        for dot in self.get_drawable_dots().iter().rev() {
-        // TODO: implement showing at most MAX_DIGITS
+            self.paint_dot(dot, top_right);
-        for i in (0..self.page_count).rev() {
-            self.paint_dot(i == self.active_page, top_right);
             top_right.x -= Self::DOTS_INTERVAL;
-            top_right.print();
         }
     }
 }