add widget trait

src/widgets.rs

@@ -13,3 +13,11 @@ pub use mem_graph::*;
 pub use net_graph::*;
 pub use process_table::*;
 pub use temperature_table::*;
+
+use tui::{layout::Rect, Frame};
+
+/// A [`Widget`] converts raw data into something that a user can see and interact with.
+pub trait Widget<Data> {
+    /// How to actually draw the widget to the terminal.
+    fn draw(&self, f: &mut Frame<'_>, draw_location: Rect, widget_id: u64);
+}

src/widgets/battery_info.rs

@@ -0,0 +1,5 @@
+#[derive(Default)]
+pub struct BatteryWidgetState {
+    pub currently_selected_battery_index: usize,
+    pub tab_click_locs: Option<Vec<((u16, u16), (u16, u16))>>,
+}