Fix event handling

src/action.rs

@@ -1,2 +0,0 @@
-pub enum Action {
-}

src/app.rs

@@ -1,8 +1,8 @@
 use crossterm::event::Event;
 use eyre::Result;
-use ratatui::prelude::*;
 use std::time::Duration;
 
+use crate::app_action::AppAction;
 use crate::app_event::AppEvent;
 use crate::component::Component;
 use crate::components;
@@ -12,33 +12,41 @@ pub struct App {
     pub tui: tui::Tui,
     pub tick_rate: Duration,
     pub components: Vec<Box<dyn Component>>,
+
+    should_quit: bool,
 }
 
 impl App {
     pub fn new(tick_rate: Duration) -> Result<Self> {
         let tui = tui::init()?;
 
+        let global_keys = components::global_keys::GlobalKeys::default();
         let hello_world = components::hello_world::HelloWorld::default();
-        let hello_world1 = components::hello_world::HelloWorld::default();
-        let hello_world2 = components::hello_world::HelloWorld::default();
-        let hello_world3 = components::hello_world::HelloWorld::default();
 
         Ok(Self {
             tui,
             tick_rate,
-            components: vec![
-                Box::new(hello_world),
-                Box::new(hello_world1),
-                Box::new(hello_world2),
-                Box::new(hello_world3),
-            ],
+            components: vec![Box::new(hello_world), Box::new(global_keys)],
+            should_quit: false,
         })
     }
 
     pub fn run(&mut self) -> Result<()> {
+        for component in self.components.iter_mut() {
+            component.init()?;
+        }
+
         loop {
-            let event: Option<AppEvent> = match tui::get_event(self.tick_rate)?
-            {
+            if self.should_quit {
+                break Ok(());
+            }
+
+            self.draw()?;
+        }
+    }
+
+    pub fn draw(&mut self) -> Result<()> {
+        let event: Option<AppEvent> = match tui::get_event(self.tick_rate)? {
             Some(event) => match event {
                 Event::Key(key) => Some(AppEvent::Key(key)),
                 Event::Mouse(mouse) => Some(AppEvent::Mouse(mouse)),
@@ -50,33 +58,46 @@ impl App {
             None => None,
         };
 
-            if event.is_some() {
+        if let Some(event) = event {
+            let mut actions: Vec<AppAction> = vec![];
             for component in self.components.iter_mut() {
-                    let _ = component.handle_event(event.expect(""))?;
+                match component.handle_event(event)? {
+                    Some(action) => actions.push(action),
+                    None => (),
                 }
             }
 
+            for action in actions {
+                self.handle_action(action)?;
+            }
+        }
+
+        if self.should_quit {
+            return Ok(());
+        }
+
         self.tui.draw(|frame| {
-                let layout = Layout::default()
-                    .direction(Direction::Vertical)
-                    .constraints([
-                        Constraint::Percentage(25),
-                        Constraint::Percentage(25),
-                        Constraint::Percentage(25),
-                        Constraint::Percentage(25),
-                    ])
-                    .split(frame.size());
-
-                for (i, component) in self.components.iter_mut().enumerate() {
-                    let _ = component.render(frame, layout[i]);
+            for (_i, component) in self.components.iter_mut().enumerate() {
+                match component.render(frame, frame.size()) {
+                    Ok(_) => (),
+                    Err(_) => (),
+                }
             }
         })?;
-        }
+
+        Ok(())
     }
 
     pub fn quit(&mut self) -> Result<()> {
         tui::restore()?;
+        self.should_quit = true;
 
         Ok(())
     }
+
+    fn handle_action(&mut self, action: AppAction) -> Result<()> {
+        match action {
+            AppAction::Quit => Ok(self.quit()?),
+        }
+    }
 }

src/app_action.rs

@@ -0,0 +1,3 @@
+pub enum AppAction {
+    Quit
+}

src/component.rs

@@ -2,7 +2,7 @@ use crossterm::event::{KeyEvent, MouseEvent};
 use eyre::Result;
 use ratatui::prelude::{Frame, Rect};
 
-use crate::action::Action;
+use crate::app_action::AppAction;
 use crate::app_event::AppEvent;
 
 pub trait Component {
@@ -11,7 +11,7 @@ pub trait Component {
     }
 
     #[allow(unused)]
-    fn handle_event(&mut self, event: AppEvent) -> Result<Option<Action>> {
+    fn handle_event(&mut self, event: AppEvent) -> Result<Option<AppAction>> {
         match event {
             AppEvent::Key(key_event) => Ok(self.handle_key_event(key_event)?),
             AppEvent::Mouse(mouse_event) => {
@@ -22,7 +22,7 @@ pub trait Component {
     }
 
     #[allow(unused)]
-    fn handle_key_event(&mut self, key: KeyEvent) -> Result<Option<Action>> {
+    fn handle_key_event(&mut self, key: KeyEvent) -> Result<Option<AppAction>> {
         Ok(None)
     }
 
@@ -30,12 +30,12 @@ pub trait Component {
     fn handle_mouse_event(
         &mut self,
         mouse: MouseEvent,
-    ) -> Result<Option<Action>> {
+    ) -> Result<Option<AppAction>> {
         Ok(None)
     }
 
     #[allow(unused)]
-    fn update(&mut self, action: Action) -> Result<Option<Action>> {
+    fn update(&mut self, action: AppAction) -> Result<Option<AppAction>> {
         Ok(None)
     }
 

src/components/global_keys.rs

@@ -0,0 +1,46 @@
+use crossterm::event::{KeyCode, KeyEvent, KeyEventKind};
+use ratatui::prelude::*;
+use ratatui::widgets::*;
+
+use crate::app_action::AppAction;
+use crate::component::Component;
+
+#[derive(Default, Clone, Copy)]
+pub struct GlobalKeys {
+    should_show: bool,
+}
+
+impl Component for GlobalKeys {
+    fn handle_key_event(
+        &mut self,
+        key: KeyEvent,
+    ) -> eyre::Result<Option<AppAction>> {
+        if key.kind == KeyEventKind::Press {
+            return match key.code {
+                KeyCode::Char('q') => Ok(Some(AppAction::Quit)),
+                KeyCode::Char('?') => {
+                    self.should_show = !self.should_show;
+                    Ok(None)
+                }
+                _ => Ok(None),
+            };
+        }
+
+        Ok(None)
+    }
+
+    fn render(&mut self, frame: &mut Frame, rect: Rect) -> eyre::Result<()> {
+        let horizontal_center = Layout::default()
+            .direction(Direction::Horizontal);
+
+        let block = Block::default()
+            .title("Keyboard shortcuts")
+            .borders(Borders::ALL);
+
+        if self.should_show {
+            frame.render_widget(block, rect);
+        }
+
+        Ok(())
+    }
+}

src/components/hello_world.rs

@@ -9,6 +9,11 @@ pub struct HelloWorld {
 }
 
 impl Component for HelloWorld {
+    fn init(&mut self) -> eyre::Result<()> {
+        self.text = "Hello, world!".to_string();
+        Ok(())
+    }
+
     fn render(&mut self, frame: &mut Frame, rect: Rect) -> eyre::Result<()> {
         frame.render_widget(Paragraph::new(self.text.clone()), rect);
 

src/components/mod.rs

@@ -1 +1,2 @@
 pub mod hello_world;
+pub mod global_keys;

src/main.rs

@@ -1,5 +1,5 @@
-mod action;
 mod app;
+mod app_action;
 mod app_event;
 mod component;
 mod components;