who_has_focus method on View

src/ui/layout/view.rs

@@ -142,7 +142,7 @@ impl View {
         }
     }
 
-    // -- private
+    // -- focus
 
     /// ### blur
     ///
@@ -188,6 +188,18 @@ impl View {
         }
     }
 
+    /// ### who_has_focus
+    ///
+    /// Returns component id associated to the focus
+    pub fn who_has_focus(&self) -> Option<String> {
+        match self.focus.as_ref() {
+            Some(focus) => Some(focus.to_string()),
+            None => None,
+        }
+    }
+
+    // -- private
+
     /// ### push_to_stack
     ///
     /// Push component to stack; first remove it from the stack if any
@@ -265,6 +277,7 @@ mod tests {
         let input3: &str = "INPUT_3";
         let text1: &str = "TEXT_1";
         let text2: &str = "TEXT_2";
+        assert!(view.who_has_focus().is_none());
         // Mount components
         view.mount(input1, make_component_input());
         view.mount(input2, make_component_input());
@@ -284,6 +297,7 @@ mod tests {
         assert_eq!(view.focus_stack.len(), 0);
         // Give focus to a component
         view.active(input1);
+        assert_eq!(view.who_has_focus().as_ref().unwrap().as_str(), input1);
         // Check focus
         assert_eq!(view.focus.as_ref().unwrap().as_str(), input1);
         assert_eq!(view.focus_stack.len(), 0); // NOTE: stack is empty until a focus gets blurred