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use crossbeam_channel::{self, Receiver, Sender, TryRecvError};
use self::observed::ObservedCell;
use self::observed::ObservedScreen;
use self::observed::ObservedStyle;
use crate::backend;
use crate::event::Event;
use crate::theme;
use crate::Vec2;
use std::cell::{Cell, RefCell};
use std::rc::Rc;
use unicode_segmentation::UnicodeSegmentation;
use unicode_width::UnicodeWidthStr;
pub mod observed;
pub mod observed_screen_view;
mod static_values;
use static_values::*;
pub struct Backend {
inner_sender: Sender<Option<Event>>,
inner_receiver: Receiver<Option<Event>>,
prev_frame: RefCell<Option<ObservedScreen>>,
current_frame: RefCell<ObservedScreen>,
size: Cell<Vec2>,
current_style: RefCell<Rc<ObservedStyle>>,
screen_channel: (Sender<ObservedScreen>, Receiver<ObservedScreen>),
}
impl Backend {
pub fn init(size_op: Option<Vec2>) -> Box<Backend>
where
Self: Sized,
{
let (inner_sender, inner_receiver) = crossbeam_channel::unbounded();
let size = size_op.unwrap_or(*DEFAULT_SIZE);
let mut backend = Backend {
inner_sender,
inner_receiver,
prev_frame: RefCell::new(None),
current_frame: RefCell::new(ObservedScreen::new(size)),
size: Cell::new(size),
current_style: RefCell::new(Rc::new(
DEFAULT_OBSERVED_STYLE.clone(),
)),
screen_channel: crossbeam_channel::unbounded(),
};
{
use backend::Backend;
backend.refresh();
}
Box::new(backend)
}
pub fn current_style(&self) -> Rc<ObservedStyle> {
self.current_style.borrow().clone()
}
pub fn stream(&self) -> Receiver<ObservedScreen> {
self.screen_channel.1.clone()
}
pub fn input(&self) -> Sender<Option<Event>> {
self.inner_sender.clone()
}
}
impl backend::Backend for Backend {
fn poll_event(&mut self) -> Option<Event> {
match self.inner_receiver.try_recv() {
Ok(event) => event,
Err(TryRecvError::Empty) => None,
Err(e) => panic!(e),
}
}
fn finish(&mut self) {}
fn refresh(&mut self) {
let size = self.size.get();
let current_frame =
self.current_frame.replace(ObservedScreen::new(size));
self.prev_frame.replace(Some(current_frame.clone()));
self.screen_channel.0.send(current_frame).unwrap();
}
fn has_colors(&self) -> bool {
true
}
fn screen_size(&self) -> Vec2 {
self.size.get()
}
fn print_at(&self, pos: Vec2, text: &str) {
let style = self.current_style.borrow().clone();
let mut screen = self.current_frame.borrow_mut();
let mut offset: usize = 0;
for (idx, grapheme) in text.graphemes(true).enumerate() {
let cpos = pos + Vec2::new(idx + offset, 0);
screen[cpos] = Some(ObservedCell::new(
cpos,
style.clone(),
Some(grapheme.to_string()),
));
for _ in 0..grapheme.width() - 1 {
offset += 1;
let spos = pos + Vec2::new(idx + offset, 0);
screen[spos] =
Some(ObservedCell::new(spos, style.clone(), None));
}
}
}
fn clear(&self, clear_color: theme::Color) {
let mut cloned_style = (*self.current_style()).clone();
let mut screen = self.current_frame.borrow_mut();
cloned_style.colors.back = clear_color;
screen.clear(&Rc::new(cloned_style))
}
fn set_color(&self, new_colors: theme::ColorPair) -> theme::ColorPair {
let mut copied_style = (*self.current_style()).clone();
let old_colors = copied_style.colors;
copied_style.colors = new_colors;
self.current_style.replace(Rc::new(copied_style));
old_colors
}
fn set_effect(&self, effect: theme::Effect) {
let mut copied_style = (*self.current_style()).clone();
copied_style.effects.insert(effect);
self.current_style.replace(Rc::new(copied_style));
}
fn unset_effect(&self, effect: theme::Effect) {
let mut copied_style = (*self.current_style()).clone();
copied_style.effects.remove(effect);
self.current_style.replace(Rc::new(copied_style));
}
}