lib-nested/nested/src/vec/buffer.rs
2022-12-21 01:55:42 +01:00

162 lines
3.4 KiB
Rust

use {
crate::{
core::{InnerViewPort, OuterViewPort, View, ViewPort},
vec::VecDiff,
},
std::sync::RwLock,
std::{
ops::{Deref, DerefMut},
sync::Arc,
},
};
//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
impl<T> View for Vec<T>
where
T: Clone + Send + Sync + 'static,
{
type Msg = VecDiff<T>;
}
//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
#[derive(Clone)]
pub struct VecBuffer<T>
where
T: Clone + Send + Sync + 'static,
{
data: Arc<RwLock<Vec<T>>>,
port: InnerViewPort<RwLock<Vec<T>>>
}
impl<T> VecBuffer<T>
where
T: Clone + Send + Sync + 'static,
{
pub fn with_data(data: Vec<T>, port: InnerViewPort<RwLock<Vec<T>>>) -> Self {
let data = Arc::new(RwLock::new(data));
port.set_view(Some(data.clone()));
for x in data.read().unwrap().iter().cloned() {
port.notify(&VecDiff::Push(x));
}
VecBuffer {
data,
port
}
}
pub fn with_port(port: InnerViewPort<RwLock<Vec<T>>>) -> Self {
VecBuffer::with_data(vec![], port)
}
pub fn new() -> Self {
VecBuffer::with_port(ViewPort::new().into_inner())
}
pub fn get_port(&self) -> OuterViewPort<RwLock<Vec<T>>> {
self.port.0.outer()
}
pub fn apply_diff(&mut self, diff: VecDiff<T>) {
let mut data = self.data.write().unwrap();
match &diff {
VecDiff::Clear => {
data.clear();
}
VecDiff::Push(val) => {
data.push(val.clone());
}
VecDiff::Remove(idx) => {
data.remove(*idx);
}
VecDiff::Insert { idx, val } => {
data.insert(*idx, val.clone());
}
VecDiff::Update { idx, val } => {
data[*idx] = val.clone();
}
}
drop(data);
self.port.notify(&diff);
}
pub fn len(&self) -> usize {
self.data.read().unwrap().len()
}
pub fn get(&self, idx: usize) -> T {
self.data.read().unwrap()[idx].clone()
}
pub fn clear(&mut self) {
self.apply_diff(VecDiff::Clear);
}
pub fn push(&mut self, val: T) {
self.apply_diff(VecDiff::Push(val));
}
pub fn remove(&mut self, idx: usize) {
self.apply_diff(VecDiff::Remove(idx));
}
pub fn insert(&mut self, idx: usize, val: T) {
self.apply_diff(VecDiff::Insert { idx, val });
}
pub fn update(&mut self, idx: usize, val: T) {
self.apply_diff(VecDiff::Update { idx, val });
}
pub fn get_mut(&mut self, idx: usize) -> MutableVecAccess<T> {
MutableVecAccess {
buf: self.clone(),
idx,
val: self.get(idx),
}
}
}
//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
pub struct MutableVecAccess<T>
where
T: Clone + Send + Sync + 'static,
{
buf: VecBuffer<T>,
idx: usize,
val: T,
}
impl<T> Deref for MutableVecAccess<T>
where
T: Clone + Send + Sync + 'static,
{
type Target = T;
fn deref(&self) -> &T {
&self.val
}
}
impl<T> DerefMut for MutableVecAccess<T>
where
T: Clone + Send + Sync + 'static,
{
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.val
}
}
impl<T> Drop for MutableVecAccess<T>
where
T: Clone + Send + Sync + 'static,
{
fn drop(&mut self) {
self.buf.update(self.idx, self.val.clone());
}
}