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use crossterm::event::{KeyEvent, KeyEventKind};
use ratatui::prelude::{
Alignment, Color, Constraint, Direction, Frame, Layout, Line, Margin, Rect,
Span, Style, Stylize,
};
use ratatui::widgets::block::{Block, BorderType, Title};
use ratatui::widgets::{
Borders, Clear, Paragraph, Scrollbar, ScrollbarOrientation, ScrollbarState,
Wrap,
};
use crate::app_action::AppAction;
use crate::component::Component;
use crate::keys::key_commands::{serialize_key_event, KeyCommand};
#[derive(Default)]
pub struct GlobalKeys {
pub key_commands: Vec<KeyCommand>,
pub should_show: bool,
pub scroll: usize,
pub scroll_state: ScrollbarState,
}
impl Component for GlobalKeys {
fn init(&mut self) -> eyre::Result<()> {
self.key_commands.append(&mut vec![KeyCommand {
key_code: "?".to_string(),
description: "Toggle help menu".to_string(),
action: None,
}]);
self.scroll_state =
ScrollbarState::new(self.key_commands.len()).position(self.scroll);
Ok(())
}
fn handle_key_event(
&mut self,
key: KeyEvent,
) -> eyre::Result<Option<AppAction>> {
if key.kind == KeyEventKind::Press {
let key_event = serialize_key_event(key);
let eat_input = match key_event.as_str() {
"?" => {
self.should_show = !self.should_show;
self.scroll = 0;
true
}
"g" => {
self.scroll = 0;
true
}
"G" => {
self.scroll = self.key_commands.len() - 1;
true
}
"down" | "j" => {
if self.scroll < self.key_commands.len() - 1 {
self.scroll += 1;
}
true
}
"up" | "k" => {
if self.scroll > 0 {
self.scroll -= 1;
}
true
}
_ => false,
};
self.scroll_state = self.scroll_state.position(self.scroll);
if eat_input && self.should_show {
return Ok(None);
}
for key_command in &mut self.key_commands {
if key_command.key_code == key_event {
return Ok(key_command.action.clone());
}
}
}
Ok(None)
}
fn render(&mut self, frame: &mut Frame, rect: Rect) -> eyre::Result<()> {
let vertical_center = Layout::default()
.direction(Direction::Vertical)
.constraints([
Constraint::Percentage(50 / 2),
Constraint::Percentage(50),
Constraint::Percentage(50 / 2),
])
.split(rect);
let center = Layout::default()
.direction(Direction::Horizontal)
.constraints([
Constraint::Percentage(50 / 2),
Constraint::Percentage(50),
Constraint::Percentage(50 / 2),
])
.split(vertical_center[1])[1];
let block = Block::default()
.title(
Title::from("Keyboard shortcuts").alignment(Alignment::Center),
)
.borders(Borders::ALL)
.border_type(BorderType::Thick);
let mut lines: Vec<Line> = vec![];
for key_command in &mut self.key_commands {
let command = Span::from(key_command.key_code.clone());
let description =
Span::from(key_command.description.clone()).italic();
let spacer = Span::from(" ");
let line = Line::from(vec![command, spacer, description]);
lines.push(line);
}
let commands = Paragraph::new(lines)
.block(block)
.wrap(Wrap { trim: true })
.scroll((u16::try_from(self.scroll)?, 0))
.style(Style::default().bg(Color::DarkGray).fg(Color::White));
if self.should_show {
frame.render_widget(Clear, center);
frame.render_widget(commands, center);
frame.render_stateful_widget(
Scrollbar::new(ScrollbarOrientation::VerticalRight),
center.inner(&Margin {
vertical: 1,
horizontal: 0,
}),
&mut self.scroll_state,
);
}
Ok(())
}
}
|
