Add Empty widget

src/ui/widgets.rs

@@ -1,4 +1,5 @@
 pub mod background;
+pub mod empty;
 pub mod list;
 pub mod text;
 

src/ui/widgets/empty.rs

@@ -0,0 +1,15 @@
+use async_trait::async_trait;
+use toss::frame::{Frame, Pos, Size};
+
+use super::Widget;
+
+pub struct Empty;
+
+#[async_trait]
+impl Widget for Empty {
+    fn size(&self, _frame: &mut Frame, _max_width: Option<u16>, _max_height: Option<u16>) -> Size {
+        Size::ZERO
+    }
+
+    async fn render(self: Box<Self>, _frame: &mut Frame, _pos: Pos, _size: Size) {}
+}