WIP split element from element ref

packages/core/src/arena.rs

@@ -13,62 +13,52 @@ use crate::{
 #[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Default)]
 pub struct ElementId(pub usize);
 
-pub(crate) struct ElementRef {
+/// An Element that can be bubbled to's unique identifier.
+///
+/// `ElementId` is a `usize` that is unique across the entire VirtualDOM - but not unique across time. If a component is
+/// unmounted, then the `ElementId` will be reused for a new component.
+#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
+#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Default)]
+pub struct BubbleId(pub usize);
+
+#[derive(Debug, Clone)]
+pub struct ElementRef {
     // the pathway of the real element inside the template
-    pub path: ElementPath,
+    pub(crate) path: ElementPath,
 
     // The actual template
-    pub template: Option<NonNull<VNode<'static>>>,
+    pub(crate) template: NonNull<VNode<'static>>,
 
     // The scope the element belongs to
-    pub scope: ScopeId,
+    pub(crate) scope: ScopeId,
 }
 
 #[derive(Clone, Copy, Debug)]
-pub enum ElementPath {
-    Deep(&'static [u8]),
-    Root(usize),
-}
-
-impl ElementRef {
-    pub(crate) fn none() -> Self {
-        Self {
-            template: None,
-            path: ElementPath::Root(0),
-            scope: ScopeId(0),
-        }
-    }
+pub struct ElementPath {
+    path: &'static [u8],
 }
 
 impl VirtualDom {
-    pub(crate) fn next_element(&mut self, template: &VNode, path: &'static [u8]) -> ElementId {
-        self.next_reference(template, ElementPath::Deep(path))
+    pub(crate) fn next_element(&mut self) -> ElementId {
+        ElementId(self.elements.insert(None))
     }
 
-    pub(crate) fn next_root(&mut self, template: &VNode, path: usize) -> ElementId {
-        self.next_reference(template, ElementPath::Root(path))
+    pub(crate) fn next_element_ref(&mut self, template: &VNode, path: &'static [u8]) -> BubbleId {
+        self.next_reference(template, ElementPath { path })
     }
 
-    pub(crate) fn next_null(&mut self) -> ElementId {
-        let entry = self.elements.vacant_entry();
-        let id = entry.key();
-
-        entry.insert(ElementRef::none());
-        ElementId(id)
-    }
-
-    fn next_reference(&mut self, template: &VNode, path: ElementPath) -> ElementId {
-        let entry = self.elements.vacant_entry();
+    fn next_reference(&mut self, template: &VNode, path: ElementPath) -> BubbleId {
+        let entry = self.element_refs.vacant_entry();
         let id = entry.key();
         let scope = self.runtime.current_scope_id().unwrap_or(ScopeId(0));
 
         entry.insert(ElementRef {
             // We know this is non-null because it comes from a reference
-            template: Some(unsafe { NonNull::new_unchecked(template as *const _ as *mut _) }),
+            template: unsafe { NonNull::new_unchecked(template as *const _ as *mut _) },
             path,
             scope,
         });
-        ElementId(id)
+        BubbleId(id)
     }
 
     pub(crate) fn reclaim(&mut self, el: ElementId) {
@@ -76,7 +66,7 @@ impl VirtualDom {
             .unwrap_or_else(|| panic!("cannot reclaim {:?}", el));
     }
 
-    pub(crate) fn try_reclaim(&mut self, el: ElementId) -> Option<ElementRef> {
+    pub(crate) fn try_reclaim(&mut self, el: ElementId) -> Option<()> {
         if el.0 == 0 {
             panic!(
                 "Cannot reclaim the root element - {:#?}",
@@ -84,12 +74,26 @@ impl VirtualDom {
             );
         }
 
-        self.elements.try_remove(el.0)
+        self.elements.try_remove(el.0).map(|_| ())
+    }
+
+    pub(crate) fn set_template(&mut self, el: ElementId, node: &VNode, path: &'static [u8]) {
+        match self.elements[el.0] {
+            Some(bubble_id) => {
+                self.element_refs[bubble_id.0].path = ElementPath { path };
+                self.element_refs[bubble_id.0].template =
+                    unsafe { NonNull::new_unchecked(node as *const _ as *mut _) };
+            }
+            None => {
+                self.elements[el.0] = Some(self.next_reference(node, ElementPath { path }));
+            }
+        }
     }
 
     pub(crate) fn update_template(&mut self, el: ElementId, node: &VNode) {
+        let bubble_id = self.elements[el.0].unwrap();
         let node: *const VNode = node as *const _;
-        self.elements[el.0].template = unsafe { std::mem::transmute(node) };
+        self.element_refs[bubble_id.0].template = unsafe { std::mem::transmute(node) };
     }
 
     // Drop a scope and all its children
@@ -182,18 +186,12 @@ impl VirtualDom {
 
 impl ElementPath {
     pub(crate) fn is_decendant(&self, small: &&[u8]) -> bool {
-        match *self {
-            ElementPath::Deep(big) => small.len() <= big.len() && *small == &big[..small.len()],
-            ElementPath::Root(r) => small.len() == 1 && small[0] == r as u8,
-        }
+        small.len() <= self.path.len() && *small == &self.path[..small.len()]
     }
 }
 
 impl PartialEq<&[u8]> for ElementPath {
     fn eq(&self, other: &&[u8]) -> bool {
-        match *self {
-            ElementPath::Deep(deep) => deep.eq(*other),
-            ElementPath::Root(r) => other.len() == 1 && other[0] == r as u8,
-        }
+        self.path.eq(*other)
     }
 }

packages/core/src/create.rs

@@ -1,4 +1,5 @@
 use crate::any_props::AnyProps;
+use crate::diff::BoundaryRef;
 use crate::innerlude::{BorrowedAttributeValue, VComponent, VPlaceholder, VText};
 use crate::mutations::Mutation;
 use crate::mutations::Mutation::*;
@@ -181,15 +182,15 @@ impl<'b> VirtualDom {
         use DynamicNode::*;
         match &template.dynamic_nodes[idx] {
             node @ Component { .. } | node @ Fragment(_) => {
-                self.create_dynamic_node(template, node, idx)
+                self.create_dynamic_node(template, idx, node, idx)
             }
             Placeholder(VPlaceholder { id }) => {
-                let id = self.set_slot(template, id, idx);
+                let id = self.set_slot(id);
                 self.mutations.push(CreatePlaceholder { id });
                 1
             }
             Text(VText { id, value }) => {
-                let id = self.set_slot(template, id, idx);
+                let id = self.set_slot(id);
                 self.create_static_text(value, id);
                 1
             }
@@ -265,7 +266,7 @@ impl<'b> VirtualDom {
             .map(|sorted_index| dynamic_nodes[sorted_index].0);
 
         for idx in reversed_iter {
-            let m = self.create_dynamic_node(template, &template.dynamic_nodes[idx], idx);
+            let m = self.create_dynamic_node(template, idx, &template.dynamic_nodes[idx], idx);
             if m > 0 {
                 // The path is one shorter because the top node is the root
                 let path = &template.template.get().node_paths[idx][1..];
@@ -279,15 +280,15 @@ impl<'b> VirtualDom {
         attrs: &mut Peekable<impl Iterator<Item = (usize, &'static [u8])>>,
         root_idx: u8,
         root: ElementId,
-        node: &VNode,
+        node: &'b VNode<'b>,
     ) {
         while let Some((mut attr_id, path)) =
             attrs.next_if(|(_, p)| p.first().copied() == Some(root_idx))
         {
-            let id = self.assign_static_node_as_dynamic(path, root, node, attr_id);
+            let id = self.assign_static_node_as_dynamic(path, root);
 
             loop {
-                self.write_attribute(&node.dynamic_attrs[attr_id], id);
+                self.write_attribute(node, attr_id, &node.dynamic_attrs[attr_id], id);
 
                 // Only push the dynamic attributes forward if they match the current path (same element)
                 match attrs.next_if(|(_, p)| *p == path) {
@@ -298,7 +299,13 @@ impl<'b> VirtualDom {
         }
     }
 
-    fn write_attribute(&mut self, attribute: &'b crate::Attribute<'b>, id: ElementId) {
+    fn write_attribute(
+        &mut self,
+        template: &'b VNode<'b>,
+        idx: usize,
+        attribute: &'b crate::Attribute<'b>,
+        id: ElementId,
+    ) {
         // Make sure we set the attribute's associated id
         attribute.mounted_element.set(id);
 
@@ -307,6 +314,8 @@ impl<'b> VirtualDom {
 
         match &attribute.value {
             AttributeValue::Listener(_) => {
+                let path = &template.template.get().attr_paths[idx];
+                self.set_template(id, template, path);
                 self.mutations.push(NewEventListener {
                     // all listeners start with "on"
                     name: &unbounded_name[2..],
@@ -330,7 +339,7 @@ impl<'b> VirtualDom {
 
     fn load_template_root(&mut self, template: &VNode, root_idx: usize) -> ElementId {
         // Get an ID for this root since it's a real root
-        let this_id = self.next_root(template, root_idx);
+        let this_id = self.next_element();
         template.root_ids.borrow_mut()[root_idx] = this_id;
 
         self.mutations.push(LoadTemplate {
@@ -353,8 +362,6 @@ impl<'b> VirtualDom {
         &mut self,
         path: &'static [u8],
         this_id: ElementId,
-        template: &VNode,
-        attr_id: usize,
     ) -> ElementId {
         if path.len() == 1 {
             return this_id;
@@ -362,7 +369,7 @@ impl<'b> VirtualDom {
 
         // if attribute is on a root node, then we've already created the element
         // Else, it's deep in the template and we should create a new id for it
-        let id = self.next_element(template, template.template.get().attr_paths[attr_id]);
+        let id = self.next_element();
 
         self.mutations.push(Mutation::AssignId {
             path: &path[1..],
@@ -439,27 +446,21 @@ impl<'b> VirtualDom {
 
     pub(crate) fn create_dynamic_node(
         &mut self,
-        template: &'b VNode<'b>,
+        parent: BoundaryRef<'b>,
         node: &'b DynamicNode<'b>,
-        idx: usize,
     ) -> usize {
         use DynamicNode::*;
         match node {
-            Text(text) => self.create_dynamic_text(template, text, idx),
-            Placeholder(place) => self.create_placeholder(place, template, idx),
-            Component(component) => self.create_component_node(template, component),
+            Text(text) => self.create_dynamic_text(parent, text),
+            Placeholder(place) => self.create_placeholder(place, parent),
+            Component(component) => self.create_component_node(parent, component),
             Fragment(frag) => frag.iter().map(|child| self.create(child)).sum(),
         }
     }
 
-    fn create_dynamic_text(
-        &mut self,
-        template: &'b VNode<'b>,
-        text: &'b VText<'b>,
-        idx: usize,
-    ) -> usize {
+    fn create_dynamic_text(&mut self, parent: BoundaryRef<'b>, text: &'b VText<'b>) -> usize {
         // Allocate a dynamic element reference for this text node
-        let new_id = self.next_element(template, template.template.get().node_paths[idx]);
+        let new_id = self.next_element();
 
         // Make sure the text node is assigned to the correct element
         text.id.set(Some(new_id));
@@ -470,7 +471,7 @@ impl<'b> VirtualDom {
         // Add the mutation to the list
         self.mutations.push(HydrateText {
             id: new_id,
-            path: &template.template.get().node_paths[idx][1..],
+            path: &parent.parent.template.get().node_paths[parent.dyn_node_idx][1..],
             value,
         });
 
@@ -481,18 +482,17 @@ impl<'b> VirtualDom {
     pub(crate) fn create_placeholder(
         &mut self,
         placeholder: &VPlaceholder,
-        template: &'b VNode<'b>,
-        idx: usize,
+        parent: BoundaryRef<'b>,
     ) -> usize {
         // Allocate a dynamic element reference for this text node
-        let id = self.next_element(template, template.template.get().node_paths[idx]);
+        let id = self.next_element();
 
         // Make sure the text node is assigned to the correct element
         placeholder.id.set(Some(id));
 
         // Assign the ID to the existing node in the template
         self.mutations.push(AssignId {
-            path: &template.template.get().node_paths[idx][1..],
+            path: &parent.parent.template.get().node_paths[parent.dyn_node_idx][1..],
             id,
         });
 
@@ -502,7 +502,7 @@ impl<'b> VirtualDom {
 
     pub(super) fn create_component_node(
         &mut self,
-        template: &'b VNode<'b>,
+        parent: BoundaryRef<'b>,
         component: &'b VComponent<'b>,
     ) -> usize {
         use RenderReturn::*;
@@ -514,8 +514,11 @@ impl<'b> VirtualDom {
 
         match unsafe { self.run_scope(scope).extend_lifetime_ref() } {
             // Create the component's root element
-            Ready(t) => self.create_scope(scope, t),
-            Aborted(t) => self.mount_aborted(template, t),
+            Ready(t) => {
+                self.assign_boundary_ref(parent, t);
+                self.create_scope(scope, t)
+            }
+            Aborted(t) => self.mount_aborted(t),
         }
     }
 
@@ -531,20 +534,15 @@ impl<'b> VirtualDom {
             .unwrap_or_else(|| component.scope.get().unwrap())
     }
 
-    fn mount_aborted(&mut self, parent: &'b VNode<'b>, placeholder: &VPlaceholder) -> usize {
-        let id = self.next_element(parent, &[]);
+    fn mount_aborted(&mut self, placeholder: &VPlaceholder) -> usize {
+        let id = self.next_element();
         self.mutations.push(Mutation::CreatePlaceholder { id });
         placeholder.id.set(Some(id));
         1
     }
 
-    fn set_slot(
-        &mut self,
-        template: &'b VNode<'b>,
-        slot: &'b Cell<Option<ElementId>>,
-        id: usize,
-    ) -> ElementId {
-        let id = self.next_element(template, template.template.get().node_paths[id]);
+    fn set_slot(&mut self, slot: &'b Cell<Option<ElementId>>) -> ElementId {
+        let id = self.next_element();
         slot.set(Some(id));
         id
     }

packages/core/src/diff.rs

@@ -7,7 +7,7 @@ use crate::{
     nodes::{DynamicNode, VNode},
     scopes::ScopeId,
     virtual_dom::VirtualDom,
-    Attribute, TemplateNode,
+    Attribute, AttributeValue, TemplateNode,
 };
 
 use rustc_hash::{FxHashMap, FxHashSet};
@@ -43,14 +43,14 @@ impl<'b> VirtualDom {
 
                 // Placeholder becomes something
                 // We should also clear the error now
-                (Aborted(l), Ready(r)) => self.replace_placeholder(l, [r]),
+                (Aborted(l), Ready(r)) => self.replace_placeholder(l, [r], todo!()),
             };
         }
         self.runtime.scope_stack.borrow_mut().pop();
     }
 
     fn diff_ok_to_err(&mut self, l: &'b VNode<'b>, p: &'b VPlaceholder) {
-        let id = self.next_null();
+        let id = self.next_element();
         p.id.set(Some(id));
         self.mutations.push(Mutation::CreatePlaceholder { id });
 
@@ -81,12 +81,17 @@ impl<'b> VirtualDom {
                 if let Some(&template) = map.get(&byte_index) {
                     right_template.template.set(template);
                     if template != left_template.template.get() {
-                        return self.replace(left_template, [right_template]);
+                        return self.replace(left_template, [right_template], todo!());
                     }
                 }
             }
         }
 
+        // Copy over the parent
+        {
+            right_template.parent.set(left_template.parent.get());
+        }
+
         // If the templates are the same, we don't need to do anything, nor do we want to
         if templates_are_the_same(left_template, right_template) {
             return;
@@ -94,7 +99,7 @@ impl<'b> VirtualDom {
 
         // If the templates are different by name, we need to replace the entire template
         if templates_are_different(left_template, right_template) {
-            return self.light_diff_templates(left_template, right_template);
+            return self.light_diff_templates(left_template, right_template, todo!());
         }
 
         // If the templates are the same, we can diff the attributes and children
@@ -105,15 +110,14 @@ impl<'b> VirtualDom {
             .zip(right_template.dynamic_attrs.iter())
             .for_each(|(left_attr, right_attr)| {
                 // Move over the ID from the old to the new
-                right_attr
-                    .mounted_element
-                    .set(left_attr.mounted_element.get());
-
-                // We want to make sure anything that gets pulled is valid
-                self.update_template(left_attr.mounted_element.get(), right_template);
+                let mounted_element = left_attr.mounted_element.get();
+                right_attr.mounted_element.set(mounted_element);
 
                 // If the attributes are different (or volatile), we need to update them
-                if left_attr.value != right_attr.value || left_attr.volatile {
+                if let AttributeValue::Listener(_) = left_attr.value {
+                    // Nodes with Listeners always need their pointers updated
+                    self.update_template(mounted_element, right_template);
+                } else if left_attr.value != right_attr.value || left_attr.volatile {
                     self.update_attribute(right_attr, left_attr);
                 }
             });
@@ -123,8 +127,13 @@ impl<'b> VirtualDom {
             .dynamic_nodes
             .iter()
             .zip(right_template.dynamic_nodes.iter())
-            .for_each(|(left_node, right_node)| {
-                self.diff_dynamic_node(left_node, right_node, right_template);
+            .enumerate()
+            .for_each(|(dyn_node_idx, (left_node, right_node))| {
+                let current_ref = BoundaryRef {
+                    parent: right_template,
+                    dyn_node_idx,
+                };
+                self.diff_dynamic_node(left_node, right_node, current_ref);
             });
 
         // Make sure the roots get transferred over while we're here
@@ -135,29 +144,20 @@ impl<'b> VirtualDom {
                 right.push(element);
             }
         }
-
-        let root_ids = right_template.root_ids.borrow();
-
-        // Update the node refs
-        for i in 0..root_ids.len() {
-            if let Some(root_id) = root_ids.get(i) {
-                self.update_template(*root_id, right_template);
-            }
-        }
     }
 
     fn diff_dynamic_node(
         &mut self,
         left_node: &'b DynamicNode<'b>,
         right_node: &'b DynamicNode<'b>,
-        node: &'b VNode<'b>,
+        parent: BoundaryRef<'b>,
     ) {
         match (left_node, right_node) {
-            (Text(left), Text(right)) => self.diff_vtext(left, right, node),
-            (Fragment(left), Fragment(right)) => self.diff_non_empty_fragment(left, right),
+            (Text(left), Text(right)) => self.diff_vtext(left, right),
+            (Fragment(left), Fragment(right)) => self.diff_non_empty_fragment(left, right, parent),
             (Placeholder(left), Placeholder(right)) => right.id.set(left.id.get()),
-            (Component(left), Component(right)) => self.diff_vcomponent(left, right, node),
-            (Placeholder(left), Fragment(right)) => self.replace_placeholder(left, *right),
+            (Component(left), Component(right)) => self.diff_vcomponent(left, right, parent),
+            (Placeholder(left), Fragment(right)) => self.replace_placeholder(left, *right, parent),
             (Fragment(left), Placeholder(right)) => self.node_to_placeholder(left, right),
             _ => todo!("This is an usual custom case for dynamic nodes. We don't know how to handle it yet."),
         };
@@ -179,7 +179,7 @@ impl<'b> VirtualDom {
         &mut self,
         left: &'b VComponent<'b>,
         right: &'b VComponent<'b>,
-        right_template: &'b VNode<'b>,
+        parent: BoundaryRef<'b>,
     ) {
         if std::ptr::eq(left, right) {
             return;
@@ -187,7 +187,7 @@ impl<'b> VirtualDom {
 
         // Replace components that have different render fns
         if left.render_fn != right.render_fn {
-            return self.replace_vcomponent(right_template, right, left);
+            return self.replace_vcomponent(right, left, parent);
         }
 
         // Make sure the new vcomponent has the right scopeid associated to it
@@ -222,11 +222,11 @@ impl<'b> VirtualDom {
 
     fn replace_vcomponent(
         &mut self,
-        right_template: &'b VNode<'b>,
         right: &'b VComponent<'b>,
         left: &'b VComponent<'b>,
+        parent: BoundaryRef<'b>,
     ) {
-        let m = self.create_component_node(right_template, right);
+        let m = self.create_component_node(parent, right);
 
         let pre_edits = self.mutations.edits.len();
 
@@ -280,12 +280,17 @@ impl<'b> VirtualDom {
     ///     Component { ..props }
     /// }
     /// ```
-    fn light_diff_templates(&mut self, left: &'b VNode<'b>, right: &'b VNode<'b>) {
+    fn light_diff_templates(
+        &mut self,
+        left: &'b VNode<'b>,
+        right: &'b VNode<'b>,
+        parent: BoundaryRef<'b>,
+    ) {
         match matching_components(left, right) {
-            None => self.replace(left, [right]),
+            None => self.replace(left, [right], parent),
             Some(components) => components
                 .into_iter()
-                .for_each(|(l, r)| self.diff_vcomponent(l, r, right)),
+                .for_each(|(idx, l, r)| self.diff_vcomponent(l, r, parent)),
         }
     }
 
@@ -293,11 +298,8 @@ impl<'b> VirtualDom {
     ///
     /// This just moves the ID of the old node over to the new node, and then sets the text of the new node if it's
     /// different.
-    fn diff_vtext(&mut self, left: &'b VText<'b>, right: &'b VText<'b>, node: &'b VNode<'b>) {
-        let id = left
-            .id
-            .get()
-            .unwrap_or_else(|| self.next_element(node, &[0]));
+    fn diff_vtext(&mut self, left: &'b VText<'b>, right: &'b VText<'b>) {
+        let id = left.id.get().unwrap_or_else(|| self.next_element());
 
         right.id.set(Some(id));
         if left.value != right.value {
@@ -306,7 +308,12 @@ impl<'b> VirtualDom {
         }
     }
 
-    fn diff_non_empty_fragment(&mut self, old: &'b [VNode<'b>], new: &'b [VNode<'b>]) {
+    fn diff_non_empty_fragment(
+        &mut self,
+        old: &'b [VNode<'b>],
+        new: &'b [VNode<'b>],
+        parent: BoundaryRef<'b>,
+    ) {
         let new_is_keyed = new[0].key.is_some();
         let old_is_keyed = old[0].key.is_some();
         debug_assert!(
@@ -319,9 +326,9 @@ impl<'b> VirtualDom {
         );
 
         if new_is_keyed && old_is_keyed {
-            self.diff_keyed_children(old, new);
+            self.diff_keyed_children(old, new, parent);
         } else {
-            self.diff_non_keyed_children(old, new);
+            self.diff_non_keyed_children(old, new, parent);
         }
     }
 
@@ -333,7 +340,12 @@ impl<'b> VirtualDom {
     //     [... parent]
     //
     // the change list stack is in the same state when this function returns.
-    fn diff_non_keyed_children(&mut self, old: &'b [VNode<'b>], new: &'b [VNode<'b>]) {
+    fn diff_non_keyed_children(
+        &mut self,
+        old: &'b [VNode<'b>],
+        new: &'b [VNode<'b>],
+        parent: BoundaryRef<'b>,
+    ) {
         use std::cmp::Ordering;
 
         // Handled these cases in `diff_children` before calling this function.
@@ -342,7 +354,9 @@ impl<'b> VirtualDom {
 
         match old.len().cmp(&new.len()) {
             Ordering::Greater => self.remove_nodes(&old[new.len()..]),
-            Ordering::Less => self.create_and_insert_after(&new[old.len()..], old.last().unwrap()),
+            Ordering::Less => {
+                self.create_and_insert_after(&new[old.len()..], old.last().unwrap(), parent)
+            }
             Ordering::Equal => {}
         }
 
@@ -367,7 +381,12 @@ impl<'b> VirtualDom {
     // https://github.com/infernojs/inferno/blob/36fd96/packages/inferno/src/DOM/patching.ts#L530-L739
     //
     // The stack is empty upon entry.
-    fn diff_keyed_children(&mut self, old: &'b [VNode<'b>], new: &'b [VNode<'b>]) {
+    fn diff_keyed_children(
+        &mut self,
+        old: &'b [VNode<'b>],
+        new: &'b [VNode<'b>],
+        parent: BoundaryRef<'b>,
+    ) {
         if cfg!(debug_assertions) {
             let mut keys = rustc_hash::FxHashSet::default();
             let mut assert_unique_keys = |children: &'b [VNode<'b>]| {
@@ -395,7 +414,7 @@ impl<'b> VirtualDom {
         //
         // `shared_prefix_count` is the count of how many nodes at the start of
         // `new` and `old` share the same keys.
-        let (left_offset, right_offset) = match self.diff_keyed_ends(old, new) {
+        let (left_offset, right_offset) = match self.diff_keyed_ends(old, new, parent) {
             Some(count) => count,
             None => return,
         };
@@ -421,18 +440,18 @@ impl<'b> VirtualDom {
             if left_offset == 0 {
                 // insert at the beginning of the old list
                 let foothold = &old[old.len() - right_offset];
-                self.create_and_insert_before(new_middle, foothold);
+                self.create_and_insert_before(new_middle, foothold, parent);
             } else if right_offset == 0 {
                 // insert at the end  the old list
                 let foothold = old.last().unwrap();
-                self.create_and_insert_after(new_middle, foothold);
+                self.create_and_insert_after(new_middle, foothold, parent);
             } else {
                 // inserting in the middle
                 let foothold = &old[left_offset - 1];
-                self.create_and_insert_after(new_middle, foothold);
+                self.create_and_insert_after(new_middle, foothold, parent);
             }
         } else {
-            self.diff_keyed_middle(old_middle, new_middle);
+            self.diff_keyed_middle(old_middle, new_middle, parent);
         }
     }
 
@@ -445,6 +464,7 @@ impl<'b> VirtualDom {
         &mut self,
         old: &'b [VNode<'b>],
         new: &'b [VNode<'b>],
+        parent: BoundaryRef<'b>,
     ) -> Option<(usize, usize)> {
         let mut left_offset = 0;
 
@@ -460,7 +480,7 @@ impl<'b> VirtualDom {
         // If that was all of the old children, then create and append the remaining
         // new children and we're finished.
         if left_offset == old.len() {
-            self.create_and_insert_after(&new[left_offset..], old.last().unwrap());
+            self.create_and_insert_after(&new[left_offset..], old.last().unwrap(), parent);
             return None;
         }
 
@@ -499,7 +519,12 @@ impl<'b> VirtualDom {
     //
     // Upon exit from this function, it will be restored to that same self.
     #[allow(clippy::too_many_lines)]
-    fn diff_keyed_middle(&mut self, old: &'b [VNode<'b>], new: &'b [VNode<'b>]) {
+    fn diff_keyed_middle(
+        &mut self,
+        old: &'b [VNode<'b>],
+        new: &'b [VNode<'b>],
+        parent: BoundaryRef<'b>,
+    ) {
         /*
         1. Map the old keys into a numerical ordering based on indices.
         2. Create a map of old key to its index
@@ -556,7 +581,7 @@ impl<'b> VirtualDom {
         if shared_keys.is_empty() {
             if old.get(0).is_some() {
                 self.remove_nodes(&old[1..]);
-                self.replace(&old[0], new);
+                self.replace(&old[0], new, parent);
             } else {
                 // I think this is wrong - why are we appending?
                 // only valid of the if there are no trailing elements
@@ -734,20 +759,35 @@ impl<'b> VirtualDom {
             .sum()
     }
 
-    fn create_children(&mut self, nodes: impl IntoIterator<Item = &'b VNode<'b>>) -> usize {
-        nodes
-            .into_iter()
-            .fold(0, |acc, child| acc + self.create(child))
+    fn create_children(
+        &mut self,
+        nodes: impl IntoIterator<Item = &'b VNode<'b>>,
+        parent: BoundaryRef<'b>,
+    ) -> usize {
+        nodes.into_iter().fold(0, |acc, child| {
+            self.assign_boundary_ref(parent, child);
+            acc + self.create(child)
+        })
     }
 
-    fn create_and_insert_before(&mut self, new: &'b [VNode<'b>], before: &'b VNode<'b>) {
-        let m = self.create_children(new);
+    fn create_and_insert_before(
+        &mut self,
+        new: &'b [VNode<'b>],
+        before: &'b VNode<'b>,
+        parent: BoundaryRef<'b>,
+    ) {
+        let m = self.create_children(new, parent);
         let id = self.find_first_element(before);
         self.mutations.push(Mutation::InsertBefore { id, m })
     }
 
-    fn create_and_insert_after(&mut self, new: &'b [VNode<'b>], after: &'b VNode<'b>) {
-        let m = self.create_children(new);
+    fn create_and_insert_after(
+        &mut self,
+        new: &'b [VNode<'b>],
+        after: &'b VNode<'b>,
+        parent: BoundaryRef<'b>,
+    ) {
+        let m = self.create_children(new, parent);
         let id = self.find_last_element(after);
         self.mutations.push(Mutation::InsertAfter { id, m })
     }
@@ -757,15 +797,21 @@ impl<'b> VirtualDom {
         &mut self,
         l: &'b VPlaceholder,
         r: impl IntoIterator<Item = &'b VNode<'b>>,
+        parent: BoundaryRef<'b>,
     ) {
-        let m = self.create_children(r);
+        let m = self.create_children(r, parent);
         let id = l.id.get().unwrap();
         self.mutations.push(Mutation::ReplaceWith { id, m });
         self.reclaim(id);
     }
 
-    fn replace(&mut self, left: &'b VNode<'b>, right: impl IntoIterator<Item = &'b VNode<'b>>) {
-        let m = self.create_children(right);
+    fn replace(
+        &mut self,
+        left: &'b VNode<'b>,
+        right: impl IntoIterator<Item = &'b VNode<'b>>,
+        parent: BoundaryRef<'b>,
+    ) {
+        let m = self.create_children(right, parent);
 
         let pre_edits = self.mutations.edits.len();
 
@@ -786,7 +832,7 @@ impl<'b> VirtualDom {
 
     fn node_to_placeholder(&mut self, l: &'b [VNode<'b>], r: &'b VPlaceholder) {
         // Create the placeholder first, ensuring we get a dedicated ID for the placeholder
-        let placeholder = self.next_element(&l[0], &[]);
+        let placeholder = self.next_element();
 
         r.id.set(Some(placeholder));
 
@@ -984,6 +1030,15 @@ impl<'b> VirtualDom {
             }
         }
     }
+
+    pub(crate) fn assign_boundary_ref(&mut self, parent: BoundaryRef, child: &VNode<'_>) {
+        // assign the parent
+        let path = parent.parent.template.get().node_paths[parent.dyn_node_idx];
+
+        child
+            .parent
+            .set(Some(self.next_element_ref(parent.parent, path)));
+    }
 }
 
 /// Are the templates the same?
@@ -1005,7 +1060,7 @@ fn templates_are_different(left_template: &VNode, right_template: &VNode) -> boo
 fn matching_components<'a>(
     left: &'a VNode<'a>,
     right: &'a VNode<'a>,
-) -> Option<Vec<(&'a VComponent<'a>, &'a VComponent<'a>)>> {
+) -> Option<Vec<(usize, &'a VComponent<'a>, &'a VComponent<'a>)>> {
     let left_template = left.template.get();
     let right_template = right.template.get();
     if left_template.roots.len() != right_template.roots.len() {
@@ -1017,7 +1072,8 @@ fn matching_components<'a>(
         .roots
         .iter()
         .zip(right_template.roots.iter())
-        .map(|(l, r)| {
+        .enumerate()
+        .map(|(idx, (l, r))| {
             let (l, r) = match (l, r) {
                 (TemplateNode::Dynamic { id: l }, TemplateNode::Dynamic { id: r }) => (l, r),
                 _ => return None,
@@ -1028,7 +1084,7 @@ fn matching_components<'a>(
                 _ => return None,
             };
 
-            Some((l, r))
+            Some((idx, l, r))
         })
         .collect()
 }
@@ -1060,3 +1116,9 @@ fn is_dyn_node_only_child(node: &VNode, idx: usize) -> bool {
         _ => false,
     }
 }
+
+// A parent that can be used for bubbling
+pub(crate) struct BoundaryRef<'b> {
+    pub parent: &'b VNode<'b>,
+    pub dyn_node_idx: usize,
+}

packages/core/src/fragment.rs

@@ -30,7 +30,7 @@ pub fn Fragment<'a>(cx: Scope<'a, FragmentProps<'a>>) -> Element {
     let children = cx.props.0.as_ref()?;
     Some(VNode {
         key: children.key,
-        parent: children.parent,
+        parent: children.parent.clone(),
         template: children.template.clone(),
         root_ids: children.root_ids.clone(),
         dynamic_nodes: children.dynamic_nodes,

packages/core/src/nodes.rs

@@ -1,3 +1,4 @@
+use crate::innerlude::BubbleId;
 use crate::{
     any_props::AnyProps, arena::ElementId, Element, Event, LazyNodes, ScopeId, ScopeState,
 };
@@ -47,7 +48,7 @@ pub struct VNode<'a> {
     pub key: Option<&'a str>,
 
     /// When rendered, this template will be linked to its parent manually
-    pub parent: Option<ElementId>,
+    pub parent: Cell<Option<BubbleId>>,
 
     /// The static nodes and static descriptor of the template
     pub template: Cell<Template<'static>>,
@@ -68,7 +69,7 @@ impl<'a> VNode<'a> {
     pub fn empty(cx: &'a ScopeState) -> Element<'a> {
         Some(VNode {
             key: None,
-            parent: None,
+            parent: Default::default(),
             root_ids: RefCell::new(bumpalo::collections::Vec::new_in(cx.bump())),
             dynamic_nodes: &[],
             dynamic_attrs: &[],
@@ -722,7 +723,7 @@ impl<'b> IntoDynNode<'b> for Arguments<'_> {
 impl<'a> IntoDynNode<'a> for &'a VNode<'a> {
     fn into_vnode(self, _cx: &'a ScopeState) -> DynamicNode<'a> {
         DynamicNode::Fragment(_cx.bump().alloc([VNode {
-            parent: self.parent,
+            parent: self.parent.clone(),
             template: self.template.clone(),
             root_ids: self.root_ids.clone(),
             key: self.key,

packages/core/src/virtual_dom.rs

@@ -5,7 +5,7 @@
 use crate::{
     any_props::VProps,
     arena::{ElementId, ElementRef},
-    innerlude::{DirtyScope, ErrorBoundary, Mutations, Scheduler, SchedulerMsg},
+    innerlude::{BubbleId, DirtyScope, ErrorBoundary, Mutations, Scheduler, SchedulerMsg},
     mutations::Mutation,
     nodes::RenderReturn,
     nodes::{Template, TemplateId},
@@ -183,7 +183,10 @@ pub struct VirtualDom {
     pub(crate) templates: FxHashMap<TemplateId, FxHashMap<usize, Template<'static>>>,
 
     // Every element is actually a dual reference - one to the template and the other to the dynamic node in that template
-    pub(crate) elements: Slab<ElementRef>,
+    pub(crate) element_refs: Slab<ElementRef>,
+
+    // The element ids that are used in the renderer
+    pub(crate) elements: Slab<Option<BubbleId>>,
 
     pub(crate) mutations: Mutations<'static>,
 
@@ -260,6 +263,7 @@ impl VirtualDom {
             dirty_scopes: Default::default(),
             templates: Default::default(),
             elements: Default::default(),
+            element_refs: Default::default(),
             mutations: Mutations::default(),
             suspended_scopes: Default::default(),
         };
@@ -273,7 +277,7 @@ impl VirtualDom {
         root.provide_context(Rc::new(ErrorBoundary::new(ScopeId(0))));
 
         // the root element is always given element ID 0 since it's the container for the entire tree
-        dom.elements.insert(ElementRef::none());
+        dom.elements.insert(None);
 
         dom
     }
@@ -349,7 +353,13 @@ impl VirtualDom {
         | | |       <-- no, broke early
         |           <-- no, broke early
         */
-        let mut parent_path = self.elements.get(element.0);
+        println!("calling {:?}", element);
+        let element = match self.elements.get(element.0) {
+            Some(Some(el)) => el,
+            _ => return,
+        };
+        let mut parent_path = self.element_refs.get(element.0).cloned();
+        println!("parent path {:?}", parent_path);
         let mut listeners = vec![];
 
         // We will clone this later. The data itself is wrapped in RC to be used in callbacks if required
@@ -363,80 +373,79 @@ impl VirtualDom {
             // Loop through each dynamic attribute (in a depth first order) in this template before moving up to the template's parent.
             while let Some(el_ref) = parent_path {
                 // safety: we maintain references of all vnodes in the element slab
-                if let Some(template) = el_ref.template {
-                    let template = unsafe { template.as_ref() };
-                    let node_template = template.template.get();
-                    let target_path = el_ref.path;
-
-                    for (idx, attr) in template.dynamic_attrs.iter().enumerate() {
-                        let this_path = node_template.attr_paths[idx];
-
-                        // Remove the "on" prefix if it exists, TODO, we should remove this and settle on one
-                        if attr.name.trim_start_matches("on") == name
-                            && target_path.is_decendant(&this_path)
-                        {
-                            listeners.push(&attr.value);
-
-                            // Break if this is the exact target element.
-                            // This means we won't call two listeners with the same name on the same element. This should be
-                            // documented, or be rejected from the rsx! macro outright
-                            if target_path == this_path {
-                                break;
-                            }
+                let template = el_ref.template;
+                let template = unsafe { template.as_ref() };
+                let node_template = template.template.get();
+                let target_path = el_ref.path;
+
+                for (idx, attr) in template.dynamic_attrs.iter().enumerate() {
+                    let this_path = node_template.attr_paths[idx];
+
+                    // Remove the "on" prefix if it exists, TODO, we should remove this and settle on one
+                    if attr.name.trim_start_matches("on") == name
+                        && target_path.is_decendant(&this_path)
+                    {
+                        listeners.push(&attr.value);
+
+                        // Break if this is the exact target element.
+                        // This means we won't call two listeners with the same name on the same element. This should be
+                        // documented, or be rejected from the rsx! macro outright
+                        if target_path == this_path {
+                            break;
                         }
                     }
+                }
 
-                    // Now that we've accumulated all the parent attributes for the target element, call them in reverse order
-                    // We check the bubble state between each call to see if the event has been stopped from bubbling
-                    for listener in listeners.drain(..).rev() {
-                        if let AttributeValue::Listener(listener) = listener {
-                            let origin = el_ref.scope;
-                            self.runtime.scope_stack.borrow_mut().push(origin);
-                            self.runtime.rendering.set(false);
-                            if let Some(cb) = listener.borrow_mut().as_deref_mut() {
-                                cb(uievent.clone());
-                            }
-                            self.runtime.scope_stack.borrow_mut().pop();
-                            self.runtime.rendering.set(true);
+                // Now that we've accumulated all the parent attributes for the target element, call them in reverse order
+                // We check the bubble state between each call to see if the event has been stopped from bubbling
+                for listener in listeners.drain(..).rev() {
+                    if let AttributeValue::Listener(listener) = listener {
+                        let origin = el_ref.scope;
+                        self.runtime.scope_stack.borrow_mut().push(origin);
+                        self.runtime.rendering.set(false);
+                        if let Some(cb) = listener.borrow_mut().as_deref_mut() {
+                            cb(uievent.clone());
+                        }
+                        self.runtime.scope_stack.borrow_mut().pop();
+                        self.runtime.rendering.set(true);
 
-                            if !uievent.propagates.get() {
-                                return;
-                            }
+                        if !uievent.propagates.get() {
+                            return;
                         }
                     }
-
-                    parent_path = template.parent.and_then(|id| self.elements.get(id.0));
-                } else {
-                    break;
                 }
+
+                parent_path = template
+                    .parent
+                    .get()
+                    .and_then(|id| self.element_refs.get(id.0).cloned());
             }
         } else {
             // Otherwise, we just call the listener on the target element
             if let Some(el_ref) = parent_path {
                 // safety: we maintain references of all vnodes in the element slab
-                if let Some(template) = el_ref.template {
-                    let template = unsafe { template.as_ref() };
-                    let node_template = template.template.get();
-                    let target_path = el_ref.path;
-
-                    for (idx, attr) in template.dynamic_attrs.iter().enumerate() {
-                        let this_path = node_template.attr_paths[idx];
-
-                        // Remove the "on" prefix if it exists, TODO, we should remove this and settle on one
-                        // Only call the listener if this is the exact target element.
-                        if attr.name.trim_start_matches("on") == name && target_path == this_path {
-                            if let AttributeValue::Listener(listener) = &attr.value {
-                                let origin = el_ref.scope;
-                                self.runtime.scope_stack.borrow_mut().push(origin);
-                                self.runtime.rendering.set(false);
-                                if let Some(cb) = listener.borrow_mut().as_deref_mut() {
-                                    cb(uievent.clone());
-                                }
-                                self.runtime.scope_stack.borrow_mut().pop();
-                                self.runtime.rendering.set(true);
-
-                                break;
+                let template = el_ref.template;
+                let template = unsafe { template.as_ref() };
+                let node_template = template.template.get();
+                let target_path = el_ref.path;
+
+                for (idx, attr) in template.dynamic_attrs.iter().enumerate() {
+                    let this_path = node_template.attr_paths[idx];
+
+                    // Remove the "on" prefix if it exists, TODO, we should remove this and settle on one
+                    // Only call the listener if this is the exact target element.
+                    if attr.name.trim_start_matches("on") == name && target_path == this_path {
+                        if let AttributeValue::Listener(listener) = &attr.value {
+                            let origin = el_ref.scope;
+                            self.runtime.scope_stack.borrow_mut().push(origin);
+                            self.runtime.rendering.set(false);
+                            if let Some(cb) = listener.borrow_mut().as_deref_mut() {
+                                cb(uievent.clone());
                             }
+                            self.runtime.scope_stack.borrow_mut().pop();
+                            self.runtime.rendering.set(true);
+
+                            break;
                         }
                     }
                 }
@@ -559,7 +568,7 @@ impl VirtualDom {
             // If an error occurs, we should try to render the default error component and context where the error occured
             RenderReturn::Aborted(placeholder) => {
                 log::info!("Ran into suspended or aborted scope during rebuild");
-                let id = self.next_null();
+                let id = self.next_element();
                 placeholder.id.set(Some(id));
                 self.mutations.push(Mutation::CreatePlaceholder { id });
             }

packages/rsx/src/lib.rs

@@ -245,7 +245,7 @@ impl<'a> ToTokens for TemplateRenderer<'a> {
                 attr_paths: &[ #(#attr_paths),* ],
             };
             ::dioxus::core::VNode {
-                parent: None,
+                parent: Default::default(),
                 key: #key_tokens,
                 template: std::cell::Cell::new(TEMPLATE),
                 root_ids: dioxus::core::exports::bumpalo::collections::Vec::with_capacity_in(#root_count, __cx.bump()).into(),