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//! Trait for describing how something should be rendered into DOM nodes.
use std::fmt;
use std::rc::Rc;
use wasm_bindgen::JsCast;
use web_sys::{Node, Text};
use crate::reactive::VecDiff;
use crate::TemplateResult;
use crate::{internal::*, TemplateList};
/// Trait for describing how something should be rendered into DOM nodes.
pub trait Render {
/// Called during the initial render when creating the DOM nodes. Should return a [`Node`].
fn render(&self) -> Node;
/// Called when the node should be updated with new state.
/// The default implementation of this will replace the child node completely with the result of calling `render` again.
/// Another implementation might be better suited to some specific types.
/// For example, text nodes can simply replace the inner text instead of recreating a new node.
///
/// Returns the new node. If the node is reused instead of replaced, the returned node is simply the node passed in.
fn update_node(&self, parent: &Node, node: &Node) -> Node {
let new_node = self.render();
parent.replace_child(&new_node, &node).unwrap();
new_node
}
}
impl<T: fmt::Display + ?Sized> Render for T {
fn render(&self) -> Node {
web_sys::window()
.unwrap()
.document()
.unwrap()
.create_text_node(&format!("{}", self))
.into()
}
fn update_node(&self, _parent: &Node, node: &Node) -> Node {
// replace `textContent` of `node` instead of recreating
node.clone()
.dyn_into::<Text>()
.unwrap()
.set_text_content(Some(&format!("{}", self)));
node.clone()
}
}
impl Render for TemplateList {
fn render(&self) -> Node {
let fragment = fragment();
for item in self
.templates
.inner_signal()
.get()
.borrow()
.clone()
.into_iter()
{
append_render(
&fragment,
Box::new(move || {
let item = item.clone();
Box::new(item)
}),
);
}
fragment.into()
}
fn update_node(&self, parent: &Node, node: &Node) -> Node {
let templates = self.templates.inner_signal().get(); // subscribe to templates
let changes = Rc::clone(&self.templates.changes());
for change in changes.borrow().iter() {
match change {
VecDiff::Replace { values } => {
let first = templates.borrow().first().map(|x| x.node.clone());
for value in values {
parent.insert_before(&value.node, first.as_ref()).unwrap();
}
for template in templates.borrow().iter() {
parent.remove_child(&template.node).unwrap();
}
}
VecDiff::Insert { index, value } => {
parent
.insert_before(
&value.node,
templates
.borrow()
.get(*index)
.map(|template| template.node.next_sibling())
.flatten()
.as_ref(),
)
.unwrap();
}
VecDiff::Update { index, value } => {
parent
.replace_child(&templates.borrow()[*index].node, &value.node)
.unwrap();
}
VecDiff::Remove { index } => {
parent
.remove_child(&templates.borrow()[*index].node)
.unwrap();
}
VecDiff::Swap { index1, index2 } => {
let child1 = &templates.borrow()[*index1].node;
let child2 = &templates.borrow()[*index2].node;
parent.replace_child(child1, child2).unwrap();
parent.replace_child(child2, child1).unwrap();
}
VecDiff::Push { value } => {
parent
.insert_before(
&value.node,
templates
.borrow()
.last()
.map(|last| last.node.next_sibling())
.flatten()
.as_ref(),
)
.unwrap();
}
VecDiff::Pop => {
if let Some(last) = templates.borrow().last() {
parent.remove_child(&last.node).unwrap();
}
}
VecDiff::Clear => {
for template in templates.borrow().iter() {
parent.remove_child(&template.node).unwrap();
}
}
}
}
node.clone()
}
}
impl Render for TemplateResult {
fn render(&self) -> Node {
self.node.clone()
}
}