feat(core/rust): create common function for ellipsised text

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

@@ -11,6 +11,7 @@ use crate::ui::{
         swipe::{Swipe, SwipeDirection},
         theme, ScrollBar,
     },
+    util::long_line_content_with_ellipsis,
 };
 
 pub enum PassphraseKeyboardMsg {
@@ -309,7 +310,7 @@ impl Component for Input {
     fn paint(&mut self) {
         let style = theme::label_keyboard();
 
-        let mut text_baseline = self.area.top_left() + Offset::y(style.text_font.text_height())
+        let text_baseline = self.area.top_left() + Offset::y(style.text_font.text_height())
             - Offset::y(style.text_font.text_baseline());
 
         let text = self.textbox.content();
@@ -324,36 +325,12 @@ impl Component for Input {
         // Accounting for the pending marker, which draws itself one pixel longer than
         // the last character
         let available_area_width = self.area.width() - 1;
-        let text_to_display = if style.text_font.text_width(text) <= available_area_width {
-            text // whole text can fit
-        } else {
-            // Text is longer, showing its right end with ellipsis at the beginning.
-            let ellipsis = "...";
-            let ellipsis_width = style.text_font.text_width(ellipsis);
-
-            // Drawing the ellipsis and moving the baseline for the rest of the text.
-            display::text(
-                text_baseline,
-                ellipsis,
-                style.text_font,
-                style.text_color,
-                style.background_color,
-            );
-            text_baseline = text_baseline + Offset::x(ellipsis_width);
-
-            // Finding out how many additional text characters will fit in,
-            // starting from the right end.
-            let remaining_available_width = available_area_width - ellipsis_width;
-            let chars_from_right = style
-                .text_font
-                .longest_suffix(remaining_available_width, text);
-
-            &text[text.len() - chars_from_right..]
-        };
+        let text_to_display =
+            long_line_content_with_ellipsis(text, "...", style.text_font, available_area_width);
 
-        display::text(
+        display::text_left(
             text_baseline,
-            text_to_display,
+            &text_to_display,
             style.text_font,
             style.text_color,
             style.background_color,
@@ -363,7 +340,7 @@ impl Component for Input {
         if self.multi_tap.pending_key().is_some() {
             paint_pending_marker(
                 text_baseline,
-                text_to_display,
+                &text_to_display,
                 style.text_font,
                 style.text_color,
             );

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

@@ -6,6 +6,9 @@ use crate::ui::{
 };
 
 use cstr_core::CStr;
+use heapless::String;
+
+use super::display::Font;
 
 pub trait ResultExt {
     fn assert_if_debugging_ui(self, message: &str);
@@ -85,6 +88,7 @@ pub fn set_animation_disabled(disabled: bool) {
 pub fn animation_disabled() -> bool {
     false
 }
+
 #[cfg(not(feature = "ui_debug"))]
 pub fn set_animation_disabled(_disabled: bool) {}
 
@@ -118,6 +122,31 @@ pub fn icon_text_center(
     );
 }
 
+/// Returns text to be fit on one line of a given length.
+/// When the text is too long to fit, it is truncated with ellipsis
+/// on the left side.
+// Hardcoding 50 as the length of the returned String - there should
+// not be any lines as long as this.
+pub fn long_line_content_with_ellipsis(
+    text: &str,
+    ellipsis: &str,
+    text_font: Font,
+    available_width: i16,
+) -> String<50> {
+    if text_font.text_width(text) <= available_width {
+        String::from(text) // whole text can fit
+    } else {
+        // Text is longer, showing its right end with ellipsis at the beginning.
+        // Finding out how many additional text characters will fit in,
+        // starting from the right end.
+        let ellipsis_width = text_font.text_width(ellipsis);
+        let remaining_available_width = available_width - ellipsis_width;
+        let chars_from_right = text_font.longest_suffix(remaining_available_width, text);
+
+        build_string!(50, ellipsis, &text[text.len() - chars_from_right..])
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use crate::strutil;