stuffff

core/src/layout/event.rs

@@ -53,10 +53,27 @@ pub trait EventManager: Any + Send + Sync {
     fn undraw(&mut self, ui: UiId, inst: &WidgetInstance);
 }
 
+impl Handle<dyn EventManager> {
+    pub fn remove(&mut self, id: WidgetId) {
+        let mut s = self.get_mut();
+        // refer to s.remove documentation for why drop order
+        let contents = s.remove(id);
+        drop(s);
+        drop(contents);
+    }
+    pub fn draw(&mut self, ui: UiId, inst: &WidgetInstance) {
+        self.get_mut().draw(ui, inst);
+    }
+    pub fn undraw(&mut self, ui: UiId, inst: &WidgetInstance) {
+        self.get_mut().undraw(ui, inst);
+    }
+}
+
 impl<E: Event, Ctx: 'static> EventManager for Events<E, Ctx> {
     /// so... there is a deadlock if this is called in WidgetData::drop
     /// and some function in here owns another WidgetId
     /// so for now you need to drop the lock on self, THEN drop the contents
+    /// which is implemented for Handle<dyn EventManager>
     fn remove(&mut self, id: WidgetId) -> Box<dyn Any> {
         let contents = self.map.remove(&id);
         for ui in self.active.values_mut() {

core/src/layout/painter.rs

@@ -294,7 +294,7 @@ impl<'a> PainterCtx<'a> {
         }
 
         // run events
-        id.map_event_managers(|m| {
+        id.map_event_managers(|mut m| {
             m.draw(self.ui_id, &instance);
         });
         self.active.insert(id, instance);
@@ -328,7 +328,7 @@ impl<'a> PainterCtx<'a> {
             inst.textures.clear();
             self.textures.free();
             if undraw {
-                id.map_event_managers(|m| {
+                id.map_event_managers(|mut m| {
                     m.undraw(self.ui_id, inst);
                 });
             }

core/src/layout/ui.rs

@@ -46,7 +46,7 @@ impl Ui {
 
     fn redraw_all(&mut self) {
         for (id, inst) in self.data.active.drain() {
-            id.map_event_managers(|m| {
+            id.map_event_managers(|mut m| {
                 m.undraw(self.id, &inst);
             });
         }

core/src/layout/widget/data.rs

@@ -2,7 +2,7 @@ use std::{any::TypeId, sync::mpsc::Sender};
 
 use crate::{
     layout::{EVENT_TYPES, EventManager, WIDGETS, WidgetId, WidgetUpdate},
-    util::{HashSet, RefGuardMut},
+    util::{Handle, HashSet},
 };
 
 pub struct WidgetData<W: ?Sized> {
@@ -14,16 +14,10 @@ pub struct WidgetData<W: ?Sized> {
 }
 
 impl<W: ?Sized> WidgetData<W> {
-    pub(crate) fn event_managers(&self) -> impl Iterator<Item = RefGuardMut<'_, dyn EventManager>> {
-        self.event_managers.iter().map(|id| {
-            EVENT_TYPES
-                .lock()
-                .unwrap()
-                .get_mut(id)
-                .unwrap()
-                .clone()
-                .get_take_mut()
-        })
+    pub(crate) fn event_managers(&self) -> impl Iterator<Item = Handle<dyn EventManager>> {
+        self.event_managers
+            .iter()
+            .map(|id| EVENT_TYPES.lock().unwrap().get_mut(id).unwrap().clone())
     }
 }
 
@@ -31,10 +25,7 @@ impl<W: ?Sized> Drop for WidgetData<W> {
     fn drop(&mut self) {
         WIDGETS.remove(self.id);
         for mut m in self.event_managers() {
-            // refer to src/layout/event.rs for why this is like this
-            let stuff = m.remove(self.id);
-            drop(m);
-            drop(stuff);
+            m.remove(self.id);
         }
     }
 }

core/src/layout/widget/handle.rs

@@ -164,12 +164,12 @@ impl WidgetId {
         WidgetRef::new(self)
     }
 
-    pub(crate) fn map_event_managers(&self, f: impl Fn(&mut dyn EventManager)) {
+    pub(crate) fn map_event_managers(&self, f: impl Fn(Handle<dyn EventManager>)) {
         let Some(data) = self.weak().data() else {
             return;
         };
-        for mut m in data.event_managers() {
-            f(&mut *m)
+        for m in data.event_managers() {
+            f(m)
         }
     }
 }