Begin to split out display module

Move the display to a dedicated module so that things can begin to DRY
out

src/display/cell.rs

@@ -0,0 +1,43 @@
+use iced::{border::Radius, widget::{button, text}, Background, Border, Color, Shadow, Theme};
+use super::super::cell::Cell;
+use super::Message;
+
+const LIGHT_GRAY: Color = Color {
+    r: 0.5,
+    g: 0.5,
+    b: 0.5,
+    a: 1.0,
+};
+
+pub fn widget(cell: &Cell) -> iced::Element<Message> {
+    let display = match cell.value() {
+        Some(v) => v.to_string(),
+        None => "?".to_string(),
+    };
+
+    button(text(display))
+        .style(|theme: &Theme, status| {
+            let palette = theme.palette();
+            let mut border = Border::default().color(LIGHT_GRAY);
+            border.width = 1.0;
+            match status {
+                button::Status::Active => {
+                    button::Style{
+                        background: Some(Background::from(palette.background)),
+                        text_color: palette.text,
+                        border,
+                        shadow: Shadow::default(),
+                    }
+                }
+                _ => {
+                    let mut style = button::primary(theme, status);
+                    style.border.radius = Radius::new(0);
+                    style
+                }
+            }
+        })
+        .height(50)
+        .width(50)
+        .on_press(Message::Pressed)
+        .into()
+}

src/display/mod.rs

@@ -0,0 +1,6 @@
+#[derive(Debug, Clone)]
+pub enum Message {
+    Pressed,
+}
+
+pub mod cell;

src/lib.rs

@@ -1,5 +1,6 @@
 mod cell;
 mod board;
+pub mod display;
 
 pub use board::Board;
 pub use board::Point;

src/main.rs

@@ -1,13 +1,8 @@
-use iced::widget::button;
-use iced::widget::text;
 use rustdoku::Board;
+use rustdoku::display;
 
 use iced;
 
-#[derive(Debug, Clone)]
-enum Message {
-    Pressed,
-}
 
 struct State {
     board: Board,
@@ -23,36 +18,26 @@ impl Default for State {
     }
 }
 
-fn display_cell(cell: &rustdoku::Cell) -> iced::Element<Message> {
-    let display = match cell.value() {
-        Some(v) => v.to_string(),
-        None => "?".to_string(),
-    };
-    button(text(display)).on_press(Message::Pressed).into()
-}
-
-fn update(state: &mut State, _message: Message) {
+fn update(state: &mut State, _message: display::Message) {
     state.message = "Hello, world".to_string();
 }
 
-fn display(state: &State) -> iced::Element<Message> {
-    let mut column: Vec<iced::Element<Message>> = Vec::with_capacity(9);
+fn display(state: &State) -> iced::Element<display::Message> {
+    let mut column: Vec<iced::Element<display::Message>> = Vec::with_capacity(9);
     for row_idx in state.board.row_range() {
-        let row: Vec<iced::Element<Message>> = state.board
+        let row: Vec<iced::Element<display::Message>> = state.board
                 .row_iter(row_idx)
                 .into_iter()
-                .map(|c| display_cell(c))
+                .map(|c| display::cell::widget(c))
                 .into_iter()
                 .collect();
         column.push(
             iced::widget::Row::with_children(row)
-                .spacing(3)
                 .into()
         );
     }
     
     iced::widget::Column::with_children(column)
-        .spacing(3)
         .into()
 }