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//! bevy_terminal_display widgets for dialog boxes
use std::time::{Duration, Instant};
use arbitrary_chunks::ArbitraryChunks as _;
use bevy::prelude::*;
use bevy_terminal_display::{
crossterm,
ratatui::{
layout::{Constraint, Flex, Layout},
style::{Style, Stylize},
text::{Line, Span},
widgets::{
Block, Borders, Clear, HighlightSpacing, List, ListItem, ListState, Padding, Paragraph,
Wrap,
},
},
widgets::TerminalWidget,
};
use unicode_segmentation::UnicodeSegmentation as _;
use yarnspinner::runtime::DialogueOption;
/// Dialog box widget marker
#[derive(Component)]
pub struct DialogBox;
/// Dialog box widget
pub struct DialogBoxWidget {
/// Name of speaking character
character: Option<String>,
/// Chunks of text and corresponding styles representing the currently spoken line
text: Vec<(String, Style)>,
/// Index of last character to draw (for typewriter effect).
typewriter_index: usize,
/// Time last character was drawn.
last_character: Instant,
/// Speed of typewriter effect (time between characters).
speed: Duration,
/// Number of characters in the text
character_count: usize,
}
impl DialogBoxWidget {
/// Constructs a new dialog box widget
pub fn new(character: Option<String>, text: Vec<(String, Style)>, speed: Duration) -> Self {
Self {
character,
character_count: text
.iter()
.fold(0, |count, (string, _)| count + string.graphemes(true).count()),
text,
speed,
typewriter_index: 0,
last_character: Instant::now(),
}
}
/// Sets the character speaking, or title of the dialog
pub fn set_character(&mut self, character: Option<String>) {
self.character = character
}
/// Sets the text contained inside the dialog box
pub fn set_text(&mut self, text: Vec<(String, Style)>) {
self.character_count = text.iter().fold(0, |count, (string, _)| count + string.graphemes(true).count());
self.text = text;
self.typewriter_index = 0;
self.last_character = Instant::now();
}
/// Gets whether all of this dialog box's text has been displayed yet
pub fn typewriter_complete(&self) -> bool {
self.character_count == 0 || self.typewriter_index >= self.character_count
}
/// Skips the typewriter effect, displaying all text in the dialog box
pub fn skip_typewriter(&mut self) {
self.typewriter_index = self.character_count;
}
}
impl TerminalWidget for DialogBoxWidget {
fn render(
&mut self,
frame: &mut bevy_terminal_display::ratatui::Frame,
rect: bevy_terminal_display::ratatui::prelude::Rect,
) {
let line = Line::from_iter(
self.text
.iter()
.map(|(text, style)| Span::styled(text, *style)),
);
let graphemes = line.styled_graphemes(Style::default());
let text = Paragraph::new(Line::from_iter(
graphemes
.take(self.typewriter_index)
.map(|g| Span::styled(g.symbol, g.style)),
))
.wrap(Wrap { trim: true })
.block({
let mut block = Block::new()
.borders(Borders::ALL)
.padding(Padding::horizontal(1));
if let Some(character) = &self.character {
block = block.title(Line::from(character.clone()).bold().underlined());
}
block
});
let [area] = Layout::horizontal([Constraint::Max(100)])
.flex(Flex::Center)
.areas(rect);
let [area] = Layout::vertical([Constraint::Max(10)])
.flex(Flex::End)
.areas(area);
frame.render_widget(Clear, area);
frame.render_widget(text, area);
}
fn update(&mut self, _time: &Time, _commands: &mut Commands) {
if self.character_count > 0 && self.typewriter_index < self.character_count {
if self.last_character.elapsed() >= self.speed {
self.typewriter_index += 1;
self.last_character = Instant::now();
}
}
}
}
/// Option selection box widget marker
#[derive(Component)]
pub struct OptionsBox;
/// Option selection box widget
#[derive(Default)]
pub struct OptionsBoxWidget {
/// State of ratatui list widget
pub state: ListState,
/// Available dialog options
pub options: Vec<(DialogueOption, Vec<(String, Style)>)>,
}
impl TerminalWidget for OptionsBoxWidget {
fn render(
&mut self,
frame: &mut bevy_terminal_display::ratatui::Frame,
rect: bevy_terminal_display::ratatui::prelude::Rect,
) {
let terminal_size = crossterm::terminal::size().unwrap();
let box_size: u16 = if terminal_size.0 > 40 { 20 } else { 10 };
let items = self
.options
.iter()
.map(|option| {
let option_spans = option
.1
.iter()
.map(|(text, style)| Span::styled(text, *style))
.collect::<Vec<_>>();
let string_chunks = textwrap::wrap(
&Line::from(option_spans.clone()).to_string(),
textwrap::Options::new(box_size as usize),
)
.into_iter()
.map(|chunk| chunk.graphemes(true).count())
.collect::<Vec<_>>();
let line = Line::from(option_spans);
let graphemes = line.styled_graphemes(Style::default()).collect::<Vec<_>>();
let mut final_string_chunks = vec![];
let mut i = 0;
for string_chunk in string_chunks {
final_string_chunks.push(string_chunk);
i += string_chunk;
if let Some(grapheme) = graphemes.get(i) {
if grapheme.symbol == " " {
final_string_chunks.push(1);
i += 1;
}
}
}
let mut chunked_graphemes = graphemes
.arbitrary_chunks(&final_string_chunks)
.collect::<Vec<_>>();
chunked_graphemes.retain(|chunk| !(chunk.len() == 1 && chunk[0].symbol == " "));
let line = chunked_graphemes
.into_iter()
.map(|chunk| {
Line::from(
chunk
.iter()
.map(|grapheme| {
Span::styled(grapheme.symbol.to_string(), grapheme.style)
})
.collect::<Vec<_>>(),
)
})
.collect::<Vec<_>>();
ListItem::new(line)
})
.collect::<Vec<_>>();
let height = items.iter().fold(0, |acc, item| acc + item.height());
let outer_block = Block::bordered().padding(Padding::horizontal(1));
let list = List::new(items)
.block(outer_block)
.highlight_symbol("-> ")
.highlight_spacing(HighlightSpacing::Always);
let [area] = Layout::horizontal([Constraint::Length(box_size + 7)])
.flex(Flex::Center)
.areas(rect);
let [area] = Layout::vertical([Constraint::Length(height as u16 + 2)])
.flex(Flex::Center)
.areas(area);
frame.render_widget(Clear, area);
frame.render_stateful_widget(list, area, &mut self.state);
}
}
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