87 lines
2.6 KiB
Rust
87 lines
2.6 KiB
Rust
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use {
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std::{
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sync::{Arc, RwLock, Weak},
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cmp::{max}
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},
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crate::{
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core::{View, Observer, ObserverExt},
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singleton::{SingletonView},
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sequence::{SequenceView},
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index::{IndexView}
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}
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};
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//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
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/// Special Observer which can access the state of the projection on notify
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/// also handles the reset() and default behaviour of unitinitalized inputs
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pub struct ProjectionArg<V, P>
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where V: View + ?Sized,
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P: Send + Sync {
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pub src: Arc<RwLock<Option<Arc<V>>>>,
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pub proj: Weak<RwLock<P>>,
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notify_fn: Box<dyn Fn(Arc<RwLock<P>>, &V::Msg) + Send + Sync>
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}
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impl<V, P> ProjectionArg<V, P>
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where V: View + ?Sized,
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P: Send + Sync {
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pub fn new(f: impl Fn(Arc<RwLock<P>>, &V::Msg) + Send + Sync + 'static) -> Arc<RwLock<Self>> {
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Arc::new(RwLock::new(ProjectionArg {
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src: Arc::new(RwLock::new(None)),
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proj: Weak::new(),
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notify_fn: Box::new(f)
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}))
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}
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}
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//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
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impl<Item, P> Observer<dyn SingletonView<Item = Item>> for ProjectionArg<dyn SingletonView<Item = Item>, P>
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where P: Send + Sync {
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fn reset(&mut self, new_src: Option<Arc<dyn SingletonView<Item = Item>>>) {
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*self.src.write().unwrap() = new_src;
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self.notify(&());
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}
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fn notify(&self, msg: &()) {
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(self.notify_fn)(self.proj.upgrade().unwrap(), msg);
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}
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}
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//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
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impl<Item, P> Observer<dyn SequenceView<Item = Item>> for ProjectionArg<dyn SequenceView<Item = Item>, P>
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where P: Send + Sync {
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fn reset(&mut self, new_src: Option<Arc<dyn SequenceView<Item = Item>>>) {
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let old_len = self.src.len().unwrap_or(0);
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*self.src.write().unwrap() = new_src;
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let new_len = self.src.len().unwrap_or(0);
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self.notify_each(0 .. max(old_len, new_len));
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}
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fn notify(&self, msg: &usize) {
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(self.notify_fn)(self.proj.upgrade().unwrap(), msg);
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}
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}
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//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
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impl<Key, Item, P> Observer<dyn IndexView<Key, Item = Item>> for ProjectionArg<dyn IndexView<Key, Item = Item>, P>
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where P: Send + Sync {
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fn reset(&mut self, new_src: Option<Arc<dyn IndexView<Key, Item = Item>>>) {
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let old_area = self.src.area();
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*self.src.write().unwrap() = new_src;
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let new_area = self.src.area();
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if let Some(area) = old_area { self.notify_each(area); }
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if let Some(area) = new_area { self.notify_each(area); }
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}
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fn notify(&self, msg: &Key) {
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(self.notify_fn)(self.proj.upgrade().unwrap(), msg);
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}
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}
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