Crossterm interface

pulse-ui/src/lib.rs

@@ -17,6 +17,25 @@ pub trait App {
     // Rendering
     async fn layout(&self) -> layout::LayoutItem;
     async fn render(&mut self, allocation: layout::Allocation);
+
+    async fn refresh(&mut self) {
+        crossterm::execute!(
+            std::io::stdout(),
+            crossterm::terminal::Clear(crossterm::terminal::ClearType::All)
+        )
+        .unwrap();
+
+        crossterm::execute!(
+            std::io::stdout(),
+            crossterm::terminal::Clear(crossterm::terminal::ClearType::Purge)
+        )
+        .unwrap();
+
+        crossterm::execute!(std::io::stdout(), crossterm::cursor::Hide).unwrap();
+
+        self.render(get_screen().allocate(&self.layout().await))
+            .await;
+    }
 }
 
 pub async fn run<A: App>(create_app: impl FnOnce(&state::Context) -> A) {
@@ -28,11 +47,11 @@ pub async fn run<A: App>(create_app: impl FnOnce(&state::Context) -> A) {
 
     app.init(ctx).await;
 
-    app.render(get_screen().allocate(&app.layout().await)).await;
+    app.refresh().await;
 
     while let Some(event) = rx.recv().await {
         app.update(event).await;
-        app.render(get_screen().allocate(&app.layout().await)).await;
+        app.refresh().await;
     }
 }
 

pulse-ui/src/render.rs

@@ -1,6 +1,10 @@
-use std::fmt::Display;
+use std::{fmt::Display, io::stdout};
 
-use crate::unit::{Point, Rect};
+use crate::{
+    layout::Allocation,
+    unit::{Point, Rect},
+    widget::Widget,
+};
 
 pub enum Instr {
     DrawText(Point, String),
@@ -55,3 +59,35 @@ impl From<Rect> for Point {
         }
     }
 }
+
+impl Allocation {
+    pub fn draw<W: Widget>(&self, index: usize, widget: W) {
+        let mut scope = RenderScope::new(self.widget_alloc[index]);
+        widget.render(&mut scope);
+        scope.draw();
+    }
+}
+
+impl RenderScope {
+    pub fn draw(self) {
+        for inst in self.draw_instructions {
+            match inst {
+                Instr::DrawText(point, text) => {
+                    for (i, line) in text.lines().enumerate() {
+                        print_at(
+                            self.rect.x + point.x,
+                            self.rect.y + point.y + i as u16,
+                            line,
+                        );
+                    }
+                }
+                Instr::DrawOutline(rect) => {}
+            }
+        }
+    }
+}
+
+pub fn print_at(x: u16, y: u16, text: &str) {
+    crossterm::execute!(stdout(), crossterm::cursor::MoveTo(x, y)).unwrap();
+    println!("{text}");
+}

pulse-ui/src/widget/mod.rs

@@ -4,7 +4,7 @@ pub trait Widget {
     fn render(&self, scope: &mut RenderScope);
 }
 
-impl Widget for str {
+impl Widget for &str {
     fn render(&self, scope: &mut RenderScope) {
         scope.draw_text(0, self);
     }