DrawContext size

examples/hello_world.rs

@@ -23,8 +23,10 @@ fn main() {
         }
     });
 
+    let (width, height) = crossterm::terminal::size().unwrap();
+
     loop {
-        cx.get_view()(&mut DrawContext {});
+        cx.get_view()(&mut DrawContext::new(width, height));
         std::thread::sleep(std::time::Duration::from_millis(16));
     }
 }
@@ -35,13 +37,12 @@ fn app(cx: &Arc<Context>) -> View {
     cx.on_event({
         let count = count.clone();
         move |_cx, _event: &KeyPress| {
-            #[allow(unused_mut)]
             let mut count = count.get();
             *count += 1;
         }
     });
 
-    Arc::new(move |_| {
-        println!("Count: {count}");
+    Arc::new(move |ctx| {
+        println!("Count: {count}, size: {:?}", ctx.available());
     })
 }

src/lib.rs

@@ -11,4 +11,39 @@ pub mod prelude {
 
 pub type View = Arc<dyn Fn(&mut DrawContext) + Send + Sync>;
 
-pub struct DrawContext {}
+#[derive(Debug, Clone)]
+pub struct Size {
+    pub width: u16,
+    pub height: u16,
+}
+
+#[derive(Debug, Clone)]
+pub struct DrawContext {
+    available: Size,
+    used: Size,
+}
+
+impl DrawContext {
+    pub fn new(width: u16, height: u16) -> Self {
+        Self {
+            available: Size { width, height },
+            used: Size {
+                width: 0,
+                height: 0,
+            },
+        }
+    }
+
+    pub fn available(&self) -> &Size {
+        &self.available
+    }
+
+    pub fn used(&self) -> &Size {
+        &self.used
+    }
+
+    pub fn allocate(&mut self, width: u16, height: u16) {
+        self.used.width += width;
+        self.used.height += height;
+    }
+}