feat(core/rust/ui): show PIN digits when touched

[no changelog]

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

@@ -1,4 +1,4 @@
-use core::ops::Deref;
+use core::{mem, ops::Deref};
 use heapless::String;
 
 use crate::{
@@ -10,10 +10,13 @@ use crate::{
         },
         display,
         geometry::{Alignment, Grid, Insets, Offset, Rect},
-        model_tt::component::{
+        model_tt::{
+            component::{
                 button::{Button, ButtonContent, ButtonMsg::Clicked},
                 theme,
             },
+            event::TouchEvent,
+        },
     },
 };
 
@@ -25,13 +28,23 @@ pub enum PinKeyboardMsg {
 const MAX_LENGTH: usize = 9;
 const DIGIT_COUNT: usize = 10; // 0..10
 
+const HEADER_HEIGHT: i32 = 25;
+const HEADER_PADDING_SIDE: i32 = 5;
+const HEADER_PADDING_BOTTOM: i32 = 12;
+
+const HEADER_PADDING: Insets = Insets::new(
+    theme::borders().top,
+    HEADER_PADDING_SIDE,
+    HEADER_PADDING_BOTTOM,
+    HEADER_PADDING_SIDE,
+);
+
 pub struct PinKeyboard<T> {
-    digits: String<MAX_LENGTH>,
     allow_cancel: bool,
     major_prompt: Label<T>,
     minor_prompt: Label<T>,
     major_warning: Option<Label<T>>,
-    dots: Child<PinDots>,
+    textbox: Child<PinDots>,
     reset_btn: Child<Maybe<Button<&'static str>>>,
     cancel_btn: Child<Maybe<Button<&'static str>>>,
     confirm_btn: Child<Button<&'static str>>,
@@ -42,10 +55,6 @@ impl<T> PinKeyboard<T>
 where
     T: Deref<Target = str>,
 {
-    const HEADER_HEIGHT: i32 = 25;
-    const HEADER_PADDING_SIDE: i32 = 5;
-    const HEADER_PADDING_BOTTOM: i32 = 12;
-
     // Label position fine-tuning.
     const MAJOR_OFF: Offset = Offset::y(-2);
     const MINOR_OFF: Offset = Offset::y(-1);
@@ -56,8 +65,6 @@ where
         major_warning: Option<T>,
         allow_cancel: bool,
     ) -> Self {
-        let digits = String::new();
-
         // Control buttons.
         let reset_btn = Button::with_icon(theme::ICON_BACK)
             .styled(theme::button_reset())
@@ -69,13 +76,12 @@ where
             Maybe::new(Pad::with_background(theme::BG), cancel_btn, allow_cancel).into_child();
 
         Self {
-            digits,
             allow_cancel,
             major_prompt: Label::left_aligned(major_prompt, theme::label_keyboard()),
             minor_prompt: Label::right_aligned(minor_prompt, theme::label_keyboard_minor()),
             major_warning: major_warning
                 .map(|text| Label::left_aligned(text, theme::label_keyboard_warning())),
-            dots: PinDots::new(0, theme::label_default()).into_child(),
+            textbox: PinDots::new(theme::label_default()).into_child(),
             reset_btn,
             cancel_btn,
             confirm_btn: Button::with_icon(theme::ICON_CONFIRM)
@@ -97,12 +103,12 @@ where
     }
 
     fn pin_modified(&mut self, ctx: &mut EventCtx) {
-        let is_full = self.digits.len() == self.digits.capacity();
+        let is_full = self.textbox.inner().is_full();
+        let is_empty = self.textbox.inner().is_empty();
+        let cancel_enabled = is_empty && self.allow_cancel;
         for btn in &mut self.digit_btns {
             btn.mutate(ctx, |ctx, btn| btn.enable_if(ctx, !is_full));
         }
-        let is_empty = self.digits.is_empty();
-        let cancel_enabled = is_empty && self.allow_cancel;
         self.reset_btn.mutate(ctx, |ctx, btn| {
             btn.show_if(ctx, !is_empty);
             btn.inner_mut().enable_if(ctx, !is_empty);
@@ -113,13 +119,10 @@ where
         });
         self.confirm_btn
             .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));
     }
 
     pub fn pin(&self) -> &str {
-        &self.digits
+        &self.textbox.inner().pin()
     }
 }
 
@@ -130,24 +133,24 @@ where
     type Msg = PinKeyboardMsg;
 
     fn place(&mut self, bounds: Rect) -> Rect {
+        // Ignore the top padding for now, we need it to reliably register textbox touch events.
+        let borders_no_top = Insets {
+            top: 0,
+            ..theme::borders()
+        };
         // Prompts and PIN dots display.
         let (header, keypad) = bounds
-            .inset(theme::borders())
+            .inset(borders_no_top)
-            .split_top(Self::HEADER_HEIGHT + Self::HEADER_PADDING_BOTTOM);
+            .split_top(theme::borders().top + HEADER_HEIGHT + HEADER_PADDING_BOTTOM);
-        let header = header.inset(Insets::new(
+        let prompt = header.inset(HEADER_PADDING);
-            0,
+        let major_area = prompt.translate(Self::MAJOR_OFF);
-            Self::HEADER_PADDING_SIDE,
+        let minor_area = prompt.translate(Self::MINOR_OFF);
-            Self::HEADER_PADDING_BOTTOM,
-            Self::HEADER_PADDING_SIDE,
-        ));
-        let major_area = header.translate(Self::MAJOR_OFF);
-        let minor_area = header.translate(Self::MINOR_OFF);
 
         // Control buttons.
         let grid = Grid::new(keypad, 4, 3).with_spacing(theme::KEYBOARD_SPACING);
 
         // Prompts and PIN dots display.
-        self.dots.place(header);
+        self.textbox.place(header);
         self.major_prompt.place(major_area);
         self.minor_prompt.place(minor_area);
         self.major_warning.as_mut().map(|c| c.place(major_area));
@@ -174,6 +177,7 @@ where
     }
 
     fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
+        self.textbox.event(ctx, event);
         if let Some(Clicked) = self.confirm_btn.event(ctx, event) {
             return Some(PinKeyboardMsg::Confirmed);
         }
@@ -181,17 +185,14 @@ where
             return Some(PinKeyboardMsg::Cancelled);
         }
         if let Some(Clicked) = self.reset_btn.event(ctx, event) {
-            self.digits.clear();
+            self.textbox.mutate(ctx, |ctx, t| t.clear(ctx));
             self.pin_modified(ctx);
             return None;
         }
         for btn in &mut self.digit_btns {
             if let Some(Clicked) = btn.event(ctx, event) {
                 if let ButtonContent::Text(text) = btn.inner().content() {
-                    if self.digits.push_str(text).is_err() {
+                    self.textbox.mutate(ctx, |ctx, t| t.push(ctx, text));
-                        // `self.pin` is full and wasn't able to accept all of
-                        // `text`. Should not happen.
-                    }
                     self.pin_modified(ctx);
                     return None;
                 }
@@ -202,8 +203,8 @@ where
 
     fn paint(&mut self) {
         self.reset_btn.paint();
-        if self.digits.is_empty() {
+        if self.textbox.inner().is_empty() {
-            self.dots.inner().clear();
+            self.textbox.inner().clear_background();
             if let Some(ref mut w) = self.major_warning {
                 w.paint();
             } else {
@@ -212,7 +213,7 @@ where
             self.minor_prompt.paint();
             self.cancel_btn.paint();
         } else {
-            self.dots.paint();
+            self.textbox.paint();
         }
         self.confirm_btn.paint();
         for btn in &mut self.digit_btns {
@@ -226,7 +227,7 @@ where
         self.reset_btn.bounds(sink);
         self.cancel_btn.bounds(sink);
         self.confirm_btn.bounds(sink);
-        self.dots.bounds(sink);
+        self.textbox.bounds(sink);
         for b in &self.digit_btns {
             b.bounds(sink)
         }
@@ -236,38 +237,93 @@ where
 struct PinDots {
     area: Rect,
     style: LabelStyle,
-    digit_count: usize,
+    digits: String<MAX_LENGTH>,
+    display_digits: bool,
 }
 
 impl PinDots {
     const DOT: i32 = 6;
     const PADDING: i32 = 4;
 
-    fn new(digit_count: usize, style: LabelStyle) -> Self {
+    fn new(style: LabelStyle) -> Self {
         Self {
-            style,
-            digit_count,
             area: Rect::zero(),
-        }
+            style,
-    }
+            digits: String::new(),
-
+            display_digits: false,
-    fn update(&mut self, ctx: &mut EventCtx, digit_count: usize) {
-        if self.digit_count != digit_count {
-            self.digit_count = digit_count;
-            ctx.request_paint();
         }
     }
 
     /// Clear the area with the background color.
-    fn clear(&self) {
+    fn clear_background(&self) {
         display::rect_fill(self.area, self.style.background_color);
     }
 
     fn size(&self) -> Offset {
-        let mut width = Self::DOT * (self.digit_count as i32);
+        let digit_count = self.digits.len();
-        width += Self::PADDING * (self.digit_count.saturating_sub(1) as i32);
+        let mut width = Self::DOT * (digit_count as i32);
+        width += Self::PADDING * (digit_count.saturating_sub(1) as i32);
         Offset::new(width, Self::DOT)
     }
+
+    fn is_empty(&self) -> bool {
+        self.digits.is_empty()
+    }
+
+    fn is_full(&self) -> bool {
+        self.digits.len() == self.digits.capacity()
+    }
+
+    fn clear(&mut self, ctx: &mut EventCtx) {
+        self.digits.clear();
+        ctx.request_paint()
+    }
+
+    fn push(&mut self, ctx: &mut EventCtx, text: &str) {
+        if self.digits.push_str(text).is_err() {
+            // `self.pin` is full and wasn't able to accept all of
+            // `text`. Should not happen.
+        };
+        ctx.request_paint()
+    }
+
+    fn pop(&mut self, ctx: &mut EventCtx) {
+        if self.digits.pop().is_some() {
+            ctx.request_paint()
+        }
+    }
+
+    fn pin(&self) -> &str {
+        &self.digits
+    }
+
+    fn paint_digits(&self, area: Rect) {
+        let center = area.center() + Offset::y(theme::FONT_MONO.text_height() / 2);
+        display::text_center(
+            center,
+            &self.digits,
+            theme::FONT_MONO,
+            self.style.text_color,
+            self.style.background_color,
+        );
+    }
+
+    fn paint_dots(&self, area: Rect) {
+        let mut cursor = self
+            .size()
+            .snap(area.center(), Alignment::Center, Alignment::Center);
+
+        // Draw a dot for each PIN digit.
+        for _ in 0..self.digits.len() {
+            display::icon_top_left(
+                cursor,
+                theme::DOT_ACTIVE,
+                self.style.text_color,
+                self.style.background_color,
+            );
+            cursor.x += Self::DOT + Self::PADDING;
+        }
+    }
 }
 
 impl Component for PinDots {
@@ -278,31 +334,39 @@ impl Component for PinDots {
         self.area
     }
 
-    fn event(&mut self, _ctx: &mut EventCtx, _event: Event) -> Option<Self::Msg> {
+    fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
+        match event {
+            Event::Touch(TouchEvent::TouchStart(pos)) => {
+                if self.area.contains(pos) {
+                    self.display_digits = true;
+                    ctx.request_paint();
+                };
                 None
             }
+            Event::Touch(TouchEvent::TouchEnd(_)) => {
+                if mem::replace(&mut self.display_digits, false) {
+                    ctx.request_paint();
+                };
+                None
+            }
+            _ => None,
+        }
+    }
 
     fn paint(&mut self) {
-        self.clear();
+        self.clear_background();
+        let dot_area = self.area.inset(HEADER_PADDING);
 
-        let mut cursor = self
+        if self.display_digits {
-            .size()
+            self.paint_digits(dot_area)
-            .snap(self.area.center(), Alignment::Center, Alignment::Center);
+        } else {
-
+            self.paint_dots(dot_area)
-        // Draw a dot for each PIN digit.
-        for _ in 0..self.digit_count {
-            display::icon_top_left(
-                cursor,
-                theme::DOT_ACTIVE,
-                self.style.text_color,
-                self.style.background_color,
-            );
-            cursor.x += Self::DOT + Self::PADDING;
         }
     }
 
     fn bounds(&self, sink: &mut dyn FnMut(Rect)) {
         sink(self.area);
+        sink(self.area.inset(HEADER_PADDING));
     }
 }