212 lines
6.0 KiB
Rust
212 lines
6.0 KiB
Rust
use std::sync::{Arc, Mutex};
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use std::future::Future;
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use std::iter::IntoIterator;
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use discard::{Discard, DiscardOnDrop};
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use futures_util::future::ready;
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use futures_signals::{cancelable_future, CancelableFutureHandle};
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use futures_signals::signal::{Signal, SignalExt};
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use futures_signals::signal_vec::{VecDiff, SignalVec, SignalVecExt};
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use web_sys::Node;
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use wasm_bindgen::UnwrapThrowExt;
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use wasm_bindgen_futures::futures_0_3::spawn_local;
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use crate::bindings;
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use crate::dom::Dom;
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use crate::callbacks::Callbacks;
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#[inline]
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pub(crate) fn spawn_future<F>(future: F) -> DiscardOnDrop<CancelableFutureHandle>
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where F: Future<Output = ()> + 'static {
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// TODO make this more efficient ?
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let (handle, future) = cancelable_future(future, || ());
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spawn_local(future);
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handle
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}
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#[inline]
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pub(crate) fn for_each<A, B>(signal: A, mut callback: B) -> CancelableFutureHandle
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where A: Signal + 'static,
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B: FnMut(A::Item) + 'static {
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DiscardOnDrop::leak(spawn_future(signal.for_each(move |value| {
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callback(value);
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ready(())
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})))
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}
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#[inline]
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fn for_each_vec<A, B>(signal: A, mut callback: B) -> CancelableFutureHandle
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where A: SignalVec + 'static,
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B: FnMut(VecDiff<A::Item>) + 'static {
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DiscardOnDrop::leak(spawn_future(signal.for_each(move |value| {
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callback(value);
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ready(())
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})))
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}
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#[inline]
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pub(crate) fn insert_children_iter<'a, A: IntoIterator<Item = &'a mut Dom>>(element: &Node, callbacks: &mut Callbacks, value: A) {
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for dom in value.into_iter() {
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// TODO can this be made more efficient ?
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callbacks.after_insert.append(&mut dom.callbacks.after_insert);
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callbacks.after_remove.append(&mut dom.callbacks.after_remove);
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bindings::append_child(element, &dom.element);
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}
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}
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pub(crate) fn insert_children_signal_vec<A>(element: Node, callbacks: &mut Callbacks, signal: A)
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where A: SignalVec<Item = Dom> + 'static {
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// TODO does this create a new struct type every time ?
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struct State {
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is_inserted: bool,
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children: Vec<Dom>,
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}
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// TODO use two separate Arcs ?
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let state = Arc::new(Mutex::new(State {
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is_inserted: false,
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children: vec![],
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}));
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{
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let state = state.clone();
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callbacks.after_insert(move |_| {
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let mut state = state.lock().unwrap_throw();
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if !state.is_inserted {
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state.is_inserted = true;
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for dom in state.children.iter_mut() {
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dom.callbacks.trigger_after_insert();
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}
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}
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});
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}
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fn clear(state: &mut State, element: &Node) {
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// TODO is this correct ?
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if state.children.len() > 0 {
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bindings::remove_all_children(element);
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for dom in state.children.drain(..) {
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dom.callbacks.discard();
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}
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}
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}
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fn insert_at(state: &mut State, element: &Node, new_index: usize, child: &Node) {
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if let Some(dom) = state.children.get(new_index) {
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bindings::insert_child_before(element, child, &dom.element);
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} else {
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bindings::append_child(element, child);
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}
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}
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fn after_insert(is_inserted: bool, callbacks: &mut Callbacks) {
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callbacks.leak();
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if is_inserted {
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callbacks.trigger_after_insert();
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}
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}
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fn process_change(state: &mut State, element: &Node, change: VecDiff<Dom>) {
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match change {
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VecDiff::Replace { values } => {
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clear(state, element);
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state.children = values;
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let is_inserted = state.is_inserted;
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for dom in state.children.iter_mut() {
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bindings::append_child(element, &dom.element);
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after_insert(is_inserted, &mut dom.callbacks);
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}
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},
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VecDiff::InsertAt { index, mut value } => {
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insert_at(state, element, index, &value.element);
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after_insert(state.is_inserted, &mut value.callbacks);
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// TODO figure out a way to move this to the top
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state.children.insert(index, value);
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},
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VecDiff::Push { mut value } => {
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bindings::append_child(element, &value.element);
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after_insert(state.is_inserted, &mut value.callbacks);
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// TODO figure out a way to move this to the top
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state.children.push(value);
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},
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VecDiff::UpdateAt { index, mut value } => {
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let dom = &mut state.children[index];
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bindings::replace_child(element, &value.element, &dom.element);
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after_insert(state.is_inserted, &mut value.callbacks);
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// TODO figure out a way to move this to the top
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// TODO test this
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::std::mem::swap(dom, &mut value);
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value.callbacks.discard();
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},
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VecDiff::Move { old_index, new_index } => {
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let value = state.children.remove(old_index);
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insert_at(state, element, new_index, &value.element);
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state.children.insert(new_index, value);
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},
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VecDiff::RemoveAt { index } => {
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let dom = state.children.remove(index);
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bindings::remove_child(element, &dom.element);
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dom.callbacks.discard();
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},
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VecDiff::Pop {} => {
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let dom = state.children.pop().unwrap_throw();
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bindings::remove_child(element, &dom.element);
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dom.callbacks.discard();
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},
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VecDiff::Clear {} => {
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clear(state, element);
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},
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}
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}
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// TODO maybe move this into the after_insert callback and remove State
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// TODO verify that this will drop `children`
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callbacks.after_remove(for_each_vec(signal, move |change| {
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let mut state = state.lock().unwrap_throw();
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process_change(&mut state, &element, change);
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}));
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}
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