Add Background widget

showbits-common/src/widgets/background.rs

@@ -0,0 +1,34 @@
+use crate::{BoxedWidget, Vec2, Widget};
+
+pub struct Background<C> {
+    inner: BoxedWidget<C>,
+    color: C,
+}
+
+impl<C> Background<C> {
+    pub fn new(inner: BoxedWidget<C>, color: C) -> Self {
+        Self { inner, color }
+    }
+}
+
+impl<C: Copy> Widget<C> for Background<C> {
+    fn size(&self, max_width: Option<i32>, max_height: Option<i32>) -> crate::Vec2 {
+        self.inner.size(max_width, max_height)
+    }
+
+    fn resize(&mut self, area: crate::Rect) {
+        self.inner.resize(area);
+    }
+
+    fn update(&mut self, _area: crate::Rect) -> anyhow::Result<()> {
+        Ok(())
+    }
+
+    fn draw(self, view: &mut crate::View<'_, C>) {
+        for y in 0..view.size().y {
+            for x in 0..view.size().x {
+                view.set(Vec2::new(x, y), self.color);
+            }
+        }
+    }
+}