86 lines
2.2 KiB
Rust
86 lines
2.2 KiB
Rust
use {
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std::{
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sync::{Arc, RwLock}
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},
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cgmath::{Point2, Vector2},
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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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InnerViewPort
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},
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index::{IndexView},
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grid::{GridView}
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}
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};
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pub struct GridOffset<V: GridView + ?Sized> {
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src: Option<Arc<V>>,
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offset: Vector2<i16>,
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cast: Arc<RwLock<ObserverBroadcast<dyn GridView<Item = V::Item>>>>
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}
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impl<V: 'static + GridView + ?Sized> GridOffset<V> {
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pub fn new(port: InnerViewPort<dyn GridView<Item = V::Item>>) -> Arc<RwLock<Self>> {
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let offset_view =
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Arc::new(RwLock::new(
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GridOffset::<V> {
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src: None,
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offset: Vector2::new(0, 0),
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cast: port.get_broadcast()
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}
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));
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port.set_view(Some(offset_view.clone()));
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offset_view
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}
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pub fn set_offset(&mut self, new_offset: Vector2<i16>) {
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let old_area = self.area();
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self.offset = new_offset;
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let new_area = self.area();
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if let Some(area) = old_area { self.cast.notify_each(area); }
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if let Some(area) = new_area { self.cast.notify_each(area); }
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}
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}
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impl<V: GridView + ?Sized> View for GridOffset<V> {
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type Msg = Point2<i16>;
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}
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impl<V: GridView + ?Sized> IndexView<Point2<i16>> for GridOffset<V> {
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type Item = V::Item;
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fn get(&self, pos: &Point2<i16>) -> Option<Self::Item> {
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self.src.as_ref()?.get(&(pos - self.offset))
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}
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fn area(&self) -> Option<Vec<Point2<i16>>> {
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Some(
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self.src.as_ref()?
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.area()?.into_iter()
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.map(|pos| pos + self.offset)
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.collect()
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)
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}
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}
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impl<V: GridView + ?Sized> Observer<V> for GridOffset<V> {
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fn reset(&mut self, view: Option<Arc<V>>) {
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let old_area = self.area();
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self.src = view;
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let new_area = self.area();
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if let Some(area) = old_area { self.cast.notify_each(area); }
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if let Some(area) = new_area { self.cast.notify_each(area); }
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}
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fn notify(&self, msg: &Point2<i16>) {
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self.cast.notify(&(msg + self.offset));
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}
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}
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