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app_handle.rs
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app_handle.rs
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//! This module contains the `App` struct, which is used to bootstrap
//! a component in an isolated scope.
use std::ops::Deref;
use crate::html::{BaseComponent, NodeRef, Scope, Scoped};
use std::rc::Rc;
use web_sys::Element;
/// An instance of an application.
#[derive(Debug)]
pub struct AppHandle<COMP: BaseComponent> {
/// `Scope` holder
pub(crate) scope: Scope<COMP>,
}
impl<COMP> AppHandle<COMP>
where
COMP: BaseComponent,
{
/// 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(element: Element, props: Rc<COMP::Properties>) -> Self {
clear_element(&element);
let app = Self {
scope: Scope::new(None),
};
app.scope
.mount_in_place(element, NodeRef::default(), NodeRef::default(), props);
app
}
/// Schedule the app for destruction
pub fn destroy(mut self) {
self.scope.destroy(false)
}
}
impl<COMP> Deref for AppHandle<COMP>
where
COMP: BaseComponent,
{
type Target = Scope<COMP>;
fn deref(&self) -> &Self::Target {
&self.scope
}
}
/// Removes anything from the given element.
fn clear_element(element: &Element) {
while let Some(child) = element.last_child() {
element.remove_child(&child).expect("can't remove a child");
}
}