Add bell widget

src/widgets.rs

@@ -1,4 +1,5 @@
 pub mod background;
+pub mod bell;
 pub mod border;
 pub mod boxed;
 pub mod cursor;
@@ -16,6 +17,7 @@ pub mod text;
 pub mod title;
 
 pub use background::*;
+pub use bell::*;
 pub use border::*;
 pub use boxed::*;
 pub use cursor::*;

src/widgets/bell.rs

@@ -0,0 +1,55 @@
+use crate::{Frame, Size, Widget, WidthDb};
+
+///////////
+// State //
+///////////
+
+#[derive(Debug, Default, Clone)]
+pub struct BellState {
+    // Whether the bell should be rung the next time the widget is displayed.
+    pub ring: bool,
+}
+
+impl BellState {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    pub fn widget(&mut self) -> Bell<'_> {
+        Bell { state: self }
+    }
+}
+
+////////////
+// Widget //
+////////////
+
+#[derive(Debug)]
+pub struct Bell<'a> {
+    state: &'a mut BellState,
+}
+
+impl Bell<'_> {
+    pub fn state(&mut self) -> &mut BellState {
+        self.state
+    }
+}
+
+impl<E> Widget<E> for Bell<'_> {
+    fn size(
+        &self,
+        _widthdb: &mut WidthDb,
+        _max_width: Option<u16>,
+        _max_height: Option<u16>,
+    ) -> Result<Size, E> {
+        Ok(Size::ZERO)
+    }
+
+    fn draw(self, frame: &mut Frame) -> Result<(), E> {
+        if self.state.ring {
+            frame.set_bell(true);
+            self.state.ring = false
+        }
+        Ok(())
+    }
+}