Implement Clone for Style

lvgl/src/lv_core/style.rs

@@ -7,6 +7,7 @@ pub enum Themes {
     Pretty,
 }
 
+#[derive(Clone)]
 pub struct Style {
     pub(crate) raw: Box<lvgl_sys::lv_style_t>,
 }

lvgl/src/mem.rs

@@ -69,6 +69,12 @@ impl<T> AsMut<T> for Box<T> {
     }
 }
 
+impl<T: Clone> Clone for Box<T> {
+    fn clone(&self) -> Self {
+        unsafe { Self::new(self.0.as_ref().clone()) }
+    }
+}
+
 #[cfg(test)]
 mod test {
     use super::*;
@@ -136,6 +142,19 @@ mod test {
         assert_eq!(initial_mem_info.free_size, final_info.free_size)
     }
 
+    #[test]
+    fn clone_object_in_lv_mem() {
+        crate::lvgl_init();
+
+        let v1 = Box::new(5);
+        let v2 = v1.clone();
+
+        // Ensure that the two objects have identical values.
+        assert_eq!(*v1, *v2);
+        // They should have different memory addresses, however.
+        assert_ne!(v1.into_raw() as usize, v2.into_raw() as usize);
+    }
+
     fn mem_info() -> lvgl_sys::lv_mem_monitor_t {
         let mut info = lvgl_sys::lv_mem_monitor_t {
             total_size: 0,