chore: minor ui components improvements (#140)

* improve ui

* .

* .

crates/ui/src/styled.rs

@@ -1,8 +1,6 @@
 use std::fmt::{self, Display, Formatter};
 
-use gpui::{
-    div, px, App, Axis, Div, Element, ElementId, Pixels, Refineable, StyleRefinement, Styled,
-};
+use gpui::{div, px, App, Axis, Div, Element, Pixels, Refineable, StyleRefinement, Styled};
 use serde::{Deserialize, Serialize};
 use theme::ActiveTheme;
 
@@ -105,9 +103,16 @@ impl From<Pixels> for Size {
 
 /// A trait for defining element that can be selected.
 pub trait Selectable: Sized {
-    fn element_id(&self) -> &ElementId;
     /// Set the selected state of the element.
     fn selected(self, selected: bool) -> Self;
+
+    /// Returns true if the element is selected.
+    fn is_selected(&self) -> bool;
+
+    /// Set is the element mouse right clicked, default do nothing.
+    fn secondary_selected(self, _: bool) -> Self {
+        self
+    }
 }
 
 /// A trait for defining element that can be disabled.