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use std::cmp::{max, min};
use tui::{
layout::{Alignment, Rect},
terminal::Frame,
text::Line,
text::Span,
widgets::{Block, Borders, Paragraph, Wrap},
};
use unicode_width::UnicodeWidthStr;
use crate::{app::App, canvas::Painter, constants};
const HELP_BASE: &str = " Help ── Esc to close ";
// TODO: [REFACTOR] Make generic dialog boxes to build off of instead?
impl Painter {
pub fn draw_help_dialog(&self, f: &mut Frame<'_>, app_state: &mut App, draw_loc: Rect) {
let help_title = Line::from(vec![
Span::styled(" Help ", self.colours.widget_title_style),
Span::styled(
format!(
"─{}─ Esc to close ",
"─".repeat(
usize::from(draw_loc.width).saturating_sub(HELP_BASE.chars().count() + 2)
)
),
self.colours.border_style,
),
]);
let block = Block::default()
.title(help_title)
.style(self.colours.border_style)
.borders(Borders::ALL)
.border_style(self.colours.border_style);
if app_state.should_get_widget_bounds() {
app_state.help_dialog_state.height = block.inner(draw_loc).height;
// We must also recalculate how many lines are wrapping to properly get scrolling to work on
// small terminal sizes... oh joy.
let mut overflow_buffer = 0;
let paragraph_width = max(draw_loc.width.saturating_sub(2), 1);
let mut prev_section_len = 0;
constants::HELP_TEXT
.iter()
.enumerate()
.for_each(|(itx, section)| {
let mut buffer = 0;
if itx == 0 {
section.iter().for_each(|text_line| {
buffer += UnicodeWidthStr::width(*text_line).saturating_sub(1) as u16
/ paragraph_width;
});
app_state.help_dialog_state.index_shortcuts[itx] = 0;
} else {
section.iter().for_each(|text_line| {
buffer += UnicodeWidthStr::width(*text_line).saturating_sub(1) as u16
/ paragraph_width;
});
app_state.help_dialog_state.index_shortcuts[itx] =
app_state.help_dialog_state.index_shortcuts[itx - 1]
+ 1
+ prev_section_len;
}
prev_section_len = section.len() as u16 + buffer;
overflow_buffer += buffer;
});
let max_scroll_index = &mut app_state.help_dialog_state.scroll_state.max_scroll_index;
*max_scroll_index = (self.styled_help_text.len() as u16 + 3 + overflow_buffer)
.saturating_sub(draw_loc.height + 1);
// Fix if over-scrolled
let index = &mut app_state
.help_dialog_state
.scroll_state
.current_scroll_index;
*index = min(*index, *max_scroll_index);
}
f.render_widget(
Paragraph::new(self.styled_help_text.clone())
.block(block)
.style(self.colours.text_style)
.alignment(Alignment::Left)
.wrap(Wrap { trim: true })
.scroll((
app_state
.help_dialog_state
.scroll_state
.current_scroll_index,
0,
)),
draw_loc,
);
}
}
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