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use crate::events::ViewportEvent;
use crate::world::{DOWN, LEFT, RIGHT, UP};
use crossterm::cursor;
use crossterm::cursor::MoveTo;
use crossterm::input::{input, InputEvent, KeyEvent, TerminalInput};
use crossterm::screen::{EnterAlternateScreen, LeaveAlternateScreen, RawScreen};
use crossterm::terminal;
use crossterm::{execute, queue, Output};
use log::debug;
use std::io::{stdout, Write};
use crate::entities::{Entity, Player};
use crate::state::State;
use crate::tiling::tile_to_str;
pub trait ViewPort {
fn render_state(&mut self, state: &State);
fn wait_input(&mut self) -> Option<ViewportEvent>;
}
pub struct CrossTermViewPort {
xsize: usize,
ysize: usize,
raw: RawScreen,
input: TerminalInput,
start: (usize, usize),
}
impl CrossTermViewPort {
pub fn new() -> CrossTermViewPort {
// Initialise the terminal, the raw alternate mode allows direct character
// seeking and hides the prompt.
let term_size = terminal::size().unwrap();
execute!(stdout(), EnterAlternateScreen).unwrap();
execute!(stdout(), cursor::Hide).unwrap();
let raw = RawScreen::into_raw_mode().unwrap();
// Initialise state, create the player and dungeon
let xsize = term_size.0 as usize;
let ysize = (term_size.1 - 2) as usize;
let input = input();
CrossTermViewPort {
xsize,
ysize,
raw,
input,
start: (0, 0),
}
}
fn draw_level(&self, state: &State) {
let mut sout = stdout();
let grid = state.get_grid().unwrap();
execute!(sout, MoveTo(0, 0)).unwrap();
for (linenum, line) in grid.raw_data().iter().enumerate() {
debug!("Drawing linenum {} -- {:?}", linenum, line);
let linestr = line.iter().map(tile_to_str).collect::<Vec<&str>>();
let mut linestr2 = String::from("");
for chr in linestr {
linestr2.push_str(chr);
}
queue!(sout, Output(linestr2), MoveTo(0, linenum as u16)).unwrap();
sout.flush().unwrap();
}
}
fn draw_entity(&self, state: &State, entity: &dyn Entity) {
if !entity.is_visible() || !entity.is_dirty() {
return;
}
let grid = state.get_grid().unwrap();
let dirt = entity.previous_location();
let background = grid.block_at(dirt.0, dirt.1);
let mut sout = stdout();
queue!(
sout,
MoveTo(dirt.0 as u16, dirt.1 as u16),
Output(tile_to_str(background)),
MoveTo(entity.location().0 as u16, entity.location().1 as u16),
Output(tile_to_str(entity.tile()))
)
.unwrap();
sout.flush().unwrap();
}
fn draw_entities(&self, state: &State) {
for e in state.current_level().entities.iter() {
self.draw_entity(state, &**e);
}
}
fn draw_player(&mut self, state: &State) {
self.draw_entity(state, state.get_player());
}
fn ui_state_position(&self) -> MoveTo {
MoveTo(0, (self.ysize) as u16)
}
fn ui_notification_position(&self) -> MoveTo {
MoveTo(0, (self.ysize + 1) as u16)
}
fn draw_ui(&self, state: &State) {
let mut sout = stdout();
queue!(
sout,
self.ui_state_position(),
Output(state.get_player().stats())
)
.unwrap();
sout.flush().unwrap();
}
pub fn notify(&self, message: String) {
let mut sout = stdout();
queue!(
sout,
self.ui_notification_position(),
Output(" ".repeat(self.xsize)),
self.ui_notification_position(),
Output(message)
)
.unwrap();
sout.flush().unwrap();
}
pub fn ui_help(&self) {
self.notify(String::from(
"quit: q, movement{up(k), down(j), left(h), right(l)}",
))
}
}
impl ViewPort for CrossTermViewPort {
fn render_state(&mut self, state: &State) {
self.draw_level(state);
self.draw_entities(state);
self.draw_player(state);
self.draw_ui(state);
}
fn wait_input(&mut self) -> Option<ViewportEvent> {
let mut reader = self.input.read_sync();
if let Some(event) = reader.next() {
return match event {
InputEvent::Keyboard(KeyEvent::Char('q')) => Some(ViewportEvent::Quit),
InputEvent::Keyboard(KeyEvent::Char('?')) => {
self.ui_help();
None
}
InputEvent::Keyboard(KeyEvent::Char('j')) => Some(ViewportEvent::MovePlayer(DOWN)),
InputEvent::Keyboard(KeyEvent::Char('k')) => Some(ViewportEvent::MovePlayer(UP)),
InputEvent::Keyboard(KeyEvent::Char('h')) => Some(ViewportEvent::MovePlayer(LEFT)),
InputEvent::Keyboard(KeyEvent::Char('l')) => Some(ViewportEvent::MovePlayer(RIGHT)),
// Arrow keys for noobs
InputEvent::Keyboard(KeyEvent::Down) => Some(ViewportEvent::MovePlayer(DOWN)),
InputEvent::Keyboard(KeyEvent::Up) => Some(ViewportEvent::MovePlayer(UP)),
InputEvent::Keyboard(KeyEvent::Left) => Some(ViewportEvent::MovePlayer(LEFT)),
InputEvent::Keyboard(KeyEvent::Right) => Some(ViewportEvent::MovePlayer(RIGHT)),
// Stairs
InputEvent::Keyboard(KeyEvent::Char('>')) => Some(ViewportEvent::DownStairs),
InputEvent::Keyboard(KeyEvent::Char('<')) => Some(ViewportEvent::UpStairs),
// No match
_ => None,
};
}
None
}
}
impl Drop for CrossTermViewPort {
fn drop(&mut self) {
execute!(stdout(), LeaveAlternateScreen).unwrap();
execute!(stdout(), cursor::Show).unwrap();
}
}
|
