feat: basic input field cycling

src/main.rs

@@ -1,9 +1,11 @@
 use std::fs;
 
 use iced::{
-    Color, Element, Renderer, Theme,
+    Color, Element, Renderer, Subscription, Task, Theme,
     alignment::{Horizontal, Vertical},
-    color, widget,
+    color, event,
+    keyboard::{self, Key, key},
+    widget,
 };
 
 mod data;
@@ -42,6 +44,8 @@ enum Message {
         i_element: usize,
         new_value: String,
     },
+
+    Event(iced::Event),
 }
 
 #[derive(Clone, Debug, Default)]
@@ -134,7 +138,7 @@ impl State {
         .padding(15)
         .into()
     }
-    fn update(&mut self, message: Message) {
+    fn update(&mut self, message: Message) -> Task<Message> {
         match message {
             Message::AddCategory => {
                 self.table.push(Default::default());
@@ -175,8 +179,35 @@ impl State {
             } => {
                 self.table[i_category].elements[i_element] = new_value;
             }
+
+            Message::Event(iced::Event::Keyboard(keyboard::Event::KeyPressed {
+                key,
+                modifiers,
+                ..
+            })) => match key.as_ref() {
+                // input field cycling
+                Key::Named(key::Named::Tab) => {
+                    if modifiers.shift() {
+                        return widget::operation::focus_previous();
+                    } else {
+                        return widget::operation::focus_next();
                     }
                 }
+
+                // ignore unused keys
+                _ => {}
+            },
+
+            // ignore unused events
+            Message::Event(_) => {}
+        }
+
+        Task::none()
+    }
+
+    fn subscription(&self) -> Subscription<Message> {
+        event::listen().map(Message::Event)
+    }
 }
 impl Drop for State {
     fn drop(&mut self) {
@@ -188,6 +219,7 @@ impl Drop for State {
 
 fn main() -> Result<(), iced::Error> {
     iced::application(State::new, State::update, State::view)
+        .subscription(State::subscription)
         .theme(Theme::custom(
             "custom",
             iced::theme::Palette {