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//! The `msg` crate contains the core functionality for
//! the on screen message.
use std::time::{Duration, Instant};
use crate::player_input::PlayerInput;
/// Duration between each character printed
const DURATION_PER: Duration = Duration::from_millis(100);
#[derive(Debug, Clone)]
pub struct Message {
text: Option<Vec<u8>>,
end: usize,
waiting: bool,
last: Instant,
}
impl Message {
/// Returns the default empty message
pub fn empty() -> Self {
Self {
text: None,
end: 0,
waiting: false,
last: Instant::now(),
}
}
/// Sets string as the current onscreen message
pub fn set_message(&mut self, msg: &str) {
let bytes = msg.bytes().collect();
self.text = Some(bytes);
self.end = 0;
}
/// Attempts to update the message on screen.
/// Returns true if a character was printed
pub fn update(&mut self, input: PlayerInput) -> bool {
let Some(text) = &self.text else { return false };
if self.end >= text.len() {
if input.interact {
self.text = None;
}
return false;
}
if self.waiting && !input.interact {
return false;
}
if self.last.elapsed() < DURATION_PER {
return false;
}
self.last = Instant::now();
if text[self.end] == b'.' {
self.waiting = true;
}
self.end += 1;
true
}
/// Returns the current ascii message (if exists)
pub fn current(&self) -> Option<&[u8]> {
self.text.as_ref().map(|text| &text[..self.end])
}
/// Returns if the message box is visible
pub const fn visible(&self) -> bool {
self.text.is_some()
}
}
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