Add clonable FutureStateChange

src/states.rs

@@ -7,6 +7,27 @@ use std::collections::HashMap;
 
 use std::sync::{Arc, Mutex, RwLock};
 
+pub trait FutureStateChange: Fn() -> Result<()> + Send + Sync {
+    fn clone_box<'a>(&self) -> Box<dyn 'a + FutureStateChange>
+    where
+        Self: 'a;
+}
+
+impl<F: Fn() -> Result<()> + Clone + Send + Sync> FutureStateChange for F {
+    fn clone_box<'a>(&self) -> Box<dyn 'a + FutureStateChange>
+    where
+        Self: 'a,
+    {
+        Box::new(self.clone())
+    }
+}
+
+impl<'a> Clone for Box<dyn 'a + FutureStateChange> {
+    fn clone(&self) -> Self {
+        (**self).clone_box()
+    }
+}
+
 struct State {
     name: String,
 
@@ -295,7 +316,7 @@ impl States {
     pub fn future_state_change<'b>(
         &self,
         id: impl Into<Option<&'b str>>,
-    ) -> Result<impl Fn() -> Result<()> + Clone + Send + Sync> {
+    ) -> Result<Box<dyn FutureStateChange>> {
         let state = id.into().map(|id| self.get_state(id)).transpose()?;
         let current_state = self.current_state.clone();
         let gui_handler = if self.control_top_gui {
@@ -305,14 +326,14 @@ impl States {
         };
         let logging = self.log_state_change;
 
-        Ok(move || {
+        Ok(Box::new(move || {
             Self::_set_state(
                 state.clone(),
                 &mut *current_state.lock().unwrap(),
                 gui_handler.clone(),
                 logging,
             )
-        })
+        }))
     }
 }