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renderer.rs
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renderer.rs
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use std::cell::Cell;
use std::panic::PanicInfo;
use std::rc::Rc;
use web_sys::Element;
use crate::app_handle::AppHandle;
use crate::html::BaseComponent;
thread_local! {
static PANIC_HOOK_IS_SET: Cell<bool> = Cell::new(false);
}
/// Set a custom panic hook.
/// Unless a panic hook is set through this function, Yew will
/// overwrite any existing panic hook when an application is rendered with [Renderer].
#[cfg(feature = "csr")]
pub fn set_custom_panic_hook(hook: Box<dyn Fn(&PanicInfo<'_>) + Sync + Send + 'static>) {
std::panic::set_hook(hook);
PANIC_HOOK_IS_SET.with(|hook_is_set| hook_is_set.set(true));
}
fn set_default_panic_hook() {
if !PANIC_HOOK_IS_SET.with(|hook_is_set| hook_is_set.replace(true)) {
std::panic::set_hook(Box::new(console_error_panic_hook::hook));
}
}
/// The Yew Renderer.
///
/// This is the main entry point of a Yew application.
#[cfg(feature = "csr")]
#[derive(Debug)]
#[must_use = "Renderer does nothing unless render() is called."]
pub struct Renderer<COMP>
where
COMP: BaseComponent + 'static,
{
root: Element,
props: COMP::Properties,
}
impl<COMP> Default for Renderer<COMP>
where
COMP: BaseComponent + 'static,
COMP::Properties: Default,
{
fn default() -> Self {
Self::with_props(Default::default())
}
}
impl<COMP> Renderer<COMP>
where
COMP: BaseComponent + 'static,
COMP::Properties: Default,
{
/// Creates a [Renderer] that renders into the document body with default properties.
pub fn new() -> Self {
Self::default()
}
/// Creates a [Renderer] that renders into a custom root with default properties.
pub fn with_root(root: Element) -> Self {
Self::with_root_and_props(root, Default::default())
}
}
impl<COMP> Renderer<COMP>
where
COMP: BaseComponent + 'static,
{
/// Creates a [Renderer] that renders into the document body with custom properties.
pub fn with_props(props: COMP::Properties) -> Self {
Self::with_root_and_props(
gloo_utils::document()
.body()
.expect("no body node found")
.into(),
props,
)
}
/// Creates a [Renderer] that renders into a custom root with custom properties.
pub fn with_root_and_props(root: Element, props: COMP::Properties) -> Self {
Self { root, props }
}
/// Renders the application.
pub fn render(self) -> AppHandle<COMP> {
set_default_panic_hook();
AppHandle::<COMP>::mount_with_props(self.root, Rc::new(self.props))
}
}
#[cfg(feature = "hydration")]
mod feat_hydration {
use super::*;
impl<COMP> Renderer<COMP>
where
COMP: BaseComponent + 'static,
{
/// Hydrates the application.
pub fn hydrate(self) -> AppHandle<COMP> {
set_default_panic_hook();
AppHandle::<COMP>::hydrate_with_props(self.root, Rc::new(self.props))
}
}
}