Add retained spawn-out animations

src/state.rs

@@ -3,8 +3,8 @@ use {
         acceptor::Acceptor,
         allocator::BufferObject,
         animation::{
-            AnimationCurve, AnimationState, AnimationTick, RetainedToplevel, expand_damage_rect,
-            spawn_in_start_rect,
+            AnimationCurve, AnimationState, AnimationTick, RetainedExitLayer, RetainedToplevel,
+            expand_damage_rect, spawn_in_start_rect,
         },
         async_engine::{AsyncEngine, SpawnedFuture},
         backend::{
@@ -1572,6 +1572,36 @@ impl State {
         }
     }
 
+    pub fn queue_spawn_out_animation(
+        self: &Rc<Self>,
+        from: Rect,
+        frame_inset: i32,
+        retained: Rc<RetainedToplevel>,
+        active: bool,
+        layer: RetainedExitLayer,
+    ) {
+        if !self.animations.enabled.get() || from.is_empty() {
+            return;
+        }
+        let now = self.now_nsec();
+        let started = self.animations.set_spawn_out(
+            from,
+            frame_inset,
+            retained,
+            active,
+            layer,
+            now,
+            self.animations.duration_ms.get(),
+        );
+        if started {
+            self.damage(expand_damage_rect(
+                from,
+                self.theme.sizes.border_width.get().max(0),
+            ));
+            self.ensure_animation_tick();
+        }
+    }
+
     pub fn set_animations_enabled(&self, enabled: bool) {
         if self.animations.enabled.replace(enabled) && !enabled {
             self.animations.clear();