switchable edn example

edn/examples/edn01.rs

@@ -1,27 +1,45 @@
 use tek_tui::{*, tek_layout::{*, tek_engine::*}};
 use tek_edn::*;
 use std::sync::{Arc, RwLock};
+use crossterm::event::{*, KeyCode::*};
 
-const EDN: &'static str = include_str!("edn01.edn");
+const EDN: &'static [&'static str] = &[
+    include_str!("edn01.edn"),
+    include_str!("edn02.edn"),
+];
 
 fn main () -> Usually<()> {
-    let state = Arc::new(RwLock::new(Example));
+    let state = Arc::new(RwLock::new(Example(0)));
     Tui::new().unwrap().run(&state)?;
     Ok(())
 }
 
-pub struct Example;
+pub struct Example(usize);
 
-impl EdnLayout<Tui> for &Example {
+impl EdnViewData<Tui> for &Example {
     fn get_content <'a> (&'a self, sym: &'a str) -> RenderBox<'a, Tui> {
-        Box::new(Thunk::new(move||if sym == ":hello-world" { "Hello world!" } else { "" }))
+        Box::new(Thunk::new(move||match sym {
+            ":hello-world" => "Hello world!",
+            ":hello" => "Hello",
+            ":world" => "world",
+            _ => ""
+        }))
     }
 }
 
 impl Content<Tui> for Example {
     fn content (&self) -> impl Render<Tui> {
-        EdnView::new(self, EDN).unwrap()
+        EdnView::new(self, EDN[self.0]).unwrap()
     }
 }
 
-impl Handle<Tui> for Example {}
+impl Handle<Tui> for Example {
+    fn handle (&mut self, input: &TuiIn) -> Perhaps<bool> {
+        match input.event() {
+            kpat!(Right) => self.0 = (self.0 + 1) % EDN.len(),
+            kpat!(Left) => self.0 = if self.0 > 0 { self.0 - 1 } else { EDN.len() - 1 },
+            _ => return Ok(None)
+        }
+        Ok(Some(true))
+    }
+}