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app_handle.rs
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app_handle.rs
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//! [AppHandle] contains the state Yew keeps to bootstrap a component in an isolated scope.
use crate::dom_bundle::BSubtree;
use crate::html::Scoped;
use crate::html::{IntoComponent, NodeRef, Scope};
use std::ops::Deref;
use std::rc::Rc;
use web_sys::Element;
/// An instance of an application.
#[derive(Debug)]
#[cfg_attr(documenting, doc(cfg(feature = "csr")))]
pub struct AppHandle<ICOMP: IntoComponent> {
/// `Scope` holder
pub(crate) scope: Scope<<ICOMP as IntoComponent>::Component>,
}
impl<ICOMP> AppHandle<ICOMP>
where
ICOMP: IntoComponent,
{
/// The main entry point of a Yew program which also allows passing properties. It works
/// similarly to the `program` function in Elm. You should provide an initial model, `update`
/// function which will update the state of the model and a `view` function which
/// will render the model to a virtual DOM tree.
pub(crate) fn mount_with_props(host: Element, props: Rc<ICOMP::Properties>) -> Self {
clear_element(&host);
let app = Self {
scope: Scope::new(None),
};
let hosting_root = BSubtree::create_root(&host);
app.scope.mount_in_place(
hosting_root,
host,
NodeRef::default(),
NodeRef::default(),
props,
);
app
}
/// Schedule the app for destruction
pub fn destroy(self) {
self.scope.destroy(false)
}
}
impl<ICOMP> Deref for AppHandle<ICOMP>
where
ICOMP: IntoComponent,
{
type Target = Scope<<ICOMP as IntoComponent>::Component>;
fn deref(&self) -> &Self::Target {
&self.scope
}
}
/// Removes anything from the given element.
fn clear_element(host: &Element) {
while let Some(child) = host.last_child() {
host.remove_child(&child).expect("can't remove a child");
}
}