dioxus/packages/core/src/arena.rs

use crate::{nodes::VNode, virtual_dom::VirtualDom, Mutations, ScopeId};

#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Default)]
pub struct ElementId(pub usize);

pub struct ElementRef {
    // the pathway of the real element inside the template
    pub path: &'static [u8],

    // The actual template
    pub template: *mut VNode<'static>,
}

impl ElementRef {
    pub fn null() -> Self {
        Self {
            template: std::ptr::null_mut(),
            path: &[],
        }
    }
}

impl<'b> VirtualDom {
    pub fn next_element(&mut self, template: &VNode, path: &'static [u8]) -> ElementId {
        let entry = self.elements.vacant_entry();
        let id = entry.key();

        entry.insert(ElementRef {
            template: template as *const _ as *mut _,
            path,
        });

        println!("Claiming {}", id);

        ElementId(id)
    }

    pub fn cleanup_element(&mut self, id: ElementId) {
        self.elements.remove(id.0);
    }

    pub fn drop_scope(&mut self, id: ScopeId) {
        // let scope = self.scopes.get(id.0).unwrap();

        // let root = scope.root_node();
        // let root = unsafe { std::mem::transmute(root) };

        // self.drop_template(root, false);
        todo!()
    }

    pub fn reclaim(&mut self, el: ElementId) {
        assert_ne!(el, ElementId(0));
        self.elements.remove(el.0);
    }

    pub fn drop_template(
        &mut self,
        mutations: &mut Mutations,
        template: &'b VNode<'b>,
        gen_roots: bool,
    ) {
        // for node in template.dynamic_nodes.iter() {
        //     match node {
        //         DynamicNode::Text { id, .. } => {}

        //         DynamicNode::Component { .. } => {
        //             todo!()
        //         }

        //         DynamicNode::Fragment { inner, nodes } => {}
        //         DynamicNode::Placeholder(_) => todo!(),
        //         _ => todo!(),
        //     }
        // }
    }
}