Add Empty widget

showbits-common/src/lib.rs

@@ -5,3 +5,4 @@ mod rect;
 mod vec2;
 mod view;
 mod widget;
+pub mod widgets;

showbits-common/src/widgets.rs

@@ -0,0 +1,3 @@
+pub use empty::Empty;
+
+mod empty;

showbits-common/src/widgets/empty.rs

@@ -0,0 +1,23 @@
+use crate::{Vec2, View, Widget};
+
+pub struct Empty {}
+
+impl Empty {
+    pub fn new() -> Self {
+        Self {}
+    }
+}
+
+impl Default for Empty {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl<C> Widget<C> for Empty {
+    fn size(&self, _max_width: Option<i32>, _max_height: Option<i32>) -> Vec2 {
+        Vec2::ZERO
+    }
+
+    fn draw(self, _view: &mut View<'_, C>) {}
+}