Guard and preserve behavior forms across document lifecycle

crates/oa-desktop/src/behavior.rs

@@ -14,10 +14,10 @@ use iced::{
 };
 use oa_core::*;
 use std::collections::BTreeMap;
-mod scenario;
+pub(crate) mod scenario;
 mod state_scene;
-mod states;
-mod topology;
+pub(crate) mod states;
+pub(crate) mod topology;
 #[derive(Debug, Clone)]
 pub enum Event {
     Topology(topology::Event),
@@ -26,6 +26,13 @@ pub enum Event {
     Submit,
 }
 impl Event {
+    pub fn starts_form(&self) -> bool {
+        matches!(self,
+            Self::Topology(topology::Event::Start(..))
+                | Self::Scenario(scenario::Event::Start(..))
+                | Self::States(states::Event::Start(..) | states::Event::Edit(..))
+        )
+    }
     pub fn is_submit(&self) -> bool {
         matches!(
             self,
@@ -123,7 +130,7 @@ pub fn view(app: &App) -> Element<'_, Message> {
             label: format!("{} · {}", e.kind(), e.name),
         })
         .collect::<Vec<_>>();
-    let owner = selected_behavior(p, app.selected);
+    let owner = app.behavior.pending_owner().or_else(|| selected_behavior(p, app.selected));
     let selected = owner
         .and_then(|id| choices.iter().find(|c| c.id == id))
         .or(choices.first())