feat: keybindings

unfortunately it looks like the tab operations can't focus buttons

src/app/mod.rs

@@ -1,6 +1,9 @@
 use std::{borrow::Cow, collections::HashMap, env, path::PathBuf, process};
 
-use iced::{Color, Element, Length, Renderer, Task, Theme, application, theme, widget};
+use iced::{
+    Color, Element, Event, Length, Renderer, Subscription, Task, Theme, application, event,
+    keyboard, theme, widget, window,
+};
 use ignore::{WalkBuilder, types::TypesBuilder};
 use rayon::iter::{ParallelBridge, ParallelIterator};
 
@@ -12,6 +15,8 @@ enum Message {
     UnloadImage(PathBuf),
 
     OpenImage(PathBuf),
+
+    KeyPressed(keyboard::Key, keyboard::Modifiers),
 }
 
 #[derive(Default)]
@@ -71,6 +76,22 @@ impl State {
                     .map_err(|e| e.to_string())
                     .err()
             }
+
+            Message::KeyPressed(key, modifiers) => match key.as_ref() {
+                // input field cycling
+                keyboard::Key::Named(keyboard::key::Named::Tab) => {
+                    return if modifiers.shift() {
+                        widget::operation::focus_previous()
+                    } else {
+                        widget::operation::focus_next()
+                    };
+                }
+
+                keyboard::Key::Character("q") => {
+                    return window::latest().and_then(window::close);
+                }
+                _ => {}
+            },
         }
 
         Task::none()
@@ -107,10 +128,20 @@ impl State {
         ])
         .into()
     }
+
+    fn subscription(&self) -> Subscription<Message> {
+        event::listen_with(|event, _status, _id| match event {
+            Event::Keyboard(keyboard::Event::KeyPressed { key, modifiers, .. }) => {
+                Some(Message::KeyPressed(key, modifiers))
+            }
+            _ => None,
+        })
+    }
 }
 
 pub fn run() -> Result<(), impl std::error::Error> {
     application(State::new, State::update, State::view)
+        .subscription(State::subscription)
         .theme(theme::Theme::custom(
             "high-contrast-dark",
             theme::Palette {