116 lines
3 KiB
Rust
116 lines
3 KiB
Rust
pub use {
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std::{
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sync::Arc,
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boxed::Box
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},
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std::sync::RwLock,
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crate::{
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core::{
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View,
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Observer,
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ObserverExt,
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ObserverBroadcast,
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ViewPort,
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InnerViewPort,
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OuterViewPort
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},
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index::{IndexArea, IndexView}
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}
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};
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impl<Key, Item> OuterViewPort<dyn IndexView<Key, Item = Item>>
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where Key: Clone + Send + Sync + 'static,
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Item: Send + Sync + 'static
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{
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pub fn map_item<
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DstItem: 'static,
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F: Fn(&Key, &Item) -> DstItem + Send + Sync + 'static
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>(
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&self,
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f: F
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) -> OuterViewPort<dyn IndexView<Key, Item = DstItem>> {
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let port = ViewPort::new();
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port.add_update_hook(Arc::new(self.0.clone()));
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let map = MapIndexItem::new(port.inner(), f);
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self.add_observer(map.clone());
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port.into_outer()
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}
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}
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pub struct MapIndexItem<Key, DstItem, SrcView, F>
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where Key: Clone + Send + Sync,
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SrcView: IndexView<Key> + ?Sized,
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F: Fn(&Key, &SrcView::Item) -> DstItem + Send + Sync
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{
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src_view: Option<Arc<SrcView>>,
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f: F,
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cast: Arc<RwLock<ObserverBroadcast<dyn IndexView<Key, Item = DstItem>>>>
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}
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impl<Key, DstItem, SrcView, F> MapIndexItem<Key, DstItem, SrcView, F>
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where Key: Clone + Send + Sync + 'static,
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DstItem: 'static,
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SrcView: IndexView<Key> + ?Sized + 'static,
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F: Fn(&Key, &SrcView::Item) -> DstItem + Send + Sync + 'static
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{
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fn new(
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port: InnerViewPort<dyn IndexView<Key, Item = DstItem>>,
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f: F
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) -> Arc<RwLock<Self>> {
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let map = Arc::new(RwLock::new(
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MapIndexItem {
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src_view: None,
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f,
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cast: port.get_broadcast()
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}
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));
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port.set_view(Some(map.clone()));
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map
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}
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}
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impl<Key, DstItem, SrcView, F> View for MapIndexItem<Key, DstItem, SrcView, F>
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where Key: Clone + Send + Sync,
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SrcView: IndexView<Key> + ?Sized,
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F: Fn(&Key, &SrcView::Item) -> DstItem + Send + Sync
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{
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type Msg = IndexArea<Key>;
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}
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impl<Key, DstItem, SrcView, F> IndexView<Key> for MapIndexItem<Key, DstItem, SrcView, F>
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where Key: Clone + Send + Sync,
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SrcView: IndexView<Key> + ?Sized,
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F: Fn(&Key, &SrcView::Item) -> DstItem + Send + Sync
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{
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type Item = DstItem;
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fn get(&self, key: &Key) -> Option<Self::Item> {
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self.src_view.get(key).as_ref().map(|item| (self.f)(key, item))
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}
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fn area(&self) -> IndexArea<Key> {
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self.src_view.area()
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}
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}
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impl<Key, DstItem, SrcView, F> Observer<SrcView> for MapIndexItem<Key, DstItem, SrcView, F>
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where Key: Clone + Send + Sync,
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SrcView: IndexView<Key> + ?Sized,
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F: Fn(&Key, &SrcView::Item) -> DstItem + Send + Sync
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{
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fn reset(&mut self, view: Option<Arc<SrcView>>) {
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let old_area = self.area();
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self.src_view = view;
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self.cast.notify(&old_area);
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self.cast.notify(&self.src_view.area())
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}
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fn notify(&mut self, area: &IndexArea<Key>) {
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self.cast.notify(area);
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}
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}
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