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use crate::interactive::CursorDirection;
use crosstermion::{input::Key, input::Key::*};
use std::{borrow::Borrow, cell::RefCell};
use tui::{
buffer::Buffer,
layout::Rect,
style::{Color, Modifier, Style},
text::{Span, Spans, Text},
widgets::{Block, Borders, Paragraph, Widget},
};
use tui_react::{
draw_text_nowrap_fn,
util::{block_width, rect},
};
#[derive(Default, Clone)]
pub struct HelpPane {
pub scroll: u16,
}
pub struct HelpPaneProps {
pub border_style: Style,
pub has_focus: bool,
}
fn margin(r: Rect, margin: u16) -> Rect {
Rect {
x: r.x + margin,
y: r.y + margin,
width: r.width - 2 * margin,
height: r.height - 2 * margin,
}
}
impl HelpPane {
pub fn process_events(&mut self, key: Key) {
match key {
Char('H') => self.scroll_help(CursorDirection::ToTop),
Char('G') => self.scroll_help(CursorDirection::ToBottom),
Ctrl('u') | PageUp => self.scroll_help(CursorDirection::PageUp),
Char('k') | Up => self.scroll_help(CursorDirection::Up),
Char('j') | Down => self.scroll_help(CursorDirection::Down),
Ctrl('d') | PageDown => self.scroll_help(CursorDirection::PageDown),
_ => {}
};
}
fn scroll_help(&mut self, direction: CursorDirection) {
self.scroll = direction.move_cursor(self.scroll as usize) as u16;
}
pub fn render(&mut self, props: impl Borrow<HelpPaneProps>, area: Rect, buf: &mut Buffer) {
let lines = {
let lines = RefCell::new(Vec::<Spans>::with_capacity(30));
let add_newlines = |n| {
for _ in 0..n {
lines.borrow_mut().push(Spans::from(Span::raw("")))
}
};
let spacer = || add_newlines(2);
let title = |name: &str| {
lines.borrow_mut().push(Spans::from(Span::styled(
name.to_string(),
Style {
add_modifier: Modifier::BOLD | Modifier::UNDERLINED,
..Default::default()
},
)));
add_newlines(1);
};
let hotkey = |keys, description, other_line: Option<&str>| {
let separator_size = 3;
let column_size = 11 + separator_size;
lines.borrow_mut().push(Spans::from(vec![
Span::styled(
format!(
"{:>column_size$}",
keys,
column_size = column_size - separator_size
),
Style {
fg: Color::Green.into(),
..Default::default()
},
),
Span::from(format!(" => {}", description)),
]));
if let Some(second_line) = other_line {
lines.borrow_mut().push(Spans::from(Span::from(format!(
"{:>column_size$}{}",
"",
second_line,
column_size = column_size + 1
))));
}
};
title("Keys for pane control");
{
hotkey(
"q/<ESC>",
"Close the current pane. Closes the program if no",
Some("pane is open"),
);
hotkey("<tab>", "Cycle between all open panes", None);
hotkey("?", "Show or hide the help pane", None);
spacer();
}
title("Keys for Navigation");
{
hotkey("j/<down>", "move down an entry", None);
hotkey("k/<up>", "move up an entry", None);
hotkey("o/l/<enter>", "descent into the selected directory", None);
hotkey("<right>", "^", None);
hotkey(
"u/h/<left>",
"ascent one level into the parent directory",
None,
);
hotkey("<backspace>", "^", None);
hotkey("Ctrl + d", "move down 10 entries at once", None);
hotkey("<Page Down>", "^", None);
hotkey("Ctrl + u", "move up 10 entries at once", None);
hotkey("<Page Up>", "^", None);
hotkey("H", "Move to the top of the entries list", None);
hotkey("G", "Move to the bottom of the entries list", None);
spacer();
}
title("Keys for display");
{
hotkey("s", "toggle sort by size ascending/descending", None);
hotkey(
"g",
"cycle through percentage display and bar options",
None,
);
spacer();
}
title("Keys for entry operations");
{
hotkey(
"Shift + o",
"Open the entry with the associated program",
None,
);
hotkey(
"d",
"Toggle the currently selected entry and move down",
None,
);
hotkey(
"x",
"Mark for the currently selected entry for deletion and move down",
None,
);
hotkey("<space bar>", "Toggle the currently selected entry", None);
spacer();
}
title("Keys in the Mark pane");
{
hotkey(
"x/d/<space>",
"remove the selected entry from the list",
None,
);
hotkey(
"Ctrl + r",
"Permanently delete all marked entries without prompt!",
Some("This operation cannot be undone!"),
);
#[cfg(feature = "trash-move")]
hotkey(
"Ctrl + t",
"Move all marked entries to the trash bin",
Some("The entries can be restored from the trash bin"),
);
spacer();
}
title("Keys for application control");
{
hotkey(
"Ctrl + c",
"close the application. No questions asked!",
None,
);
spacer();
}
lines.into_inner()
};
let HelpPaneProps {
border_style,
has_focus,
} = props.borrow();
let title = "Help";
let block = Block::default()
.title(title)
.border_style(*border_style)
.borders(Borders::ALL);
let inner_block_area = block.inner(area);
block.render(area, buf);
if *has_focus {
let help_text = " . = o|.. = u || ⇊ = CTRL+d|↓ = j|⇈ = CTRL+u|↑ = k ";
let help_text_block_width = block_width(help_text);
let bound = Rect {
width: area.width.saturating_sub(1),
..area
};
if block_width(title) + help_text_block_width <= bound.width {
draw_text_nowrap_fn(
rect::snap_to_right(bound, help_text_block_width),
buf,
help_text,
|_, _, _| Style::default(),
);
}
}
let area = margin(inner_block_area, 1);
self.scroll = self
.scroll
.min(lines.len().saturating_sub(area.height as usize) as u16);
Paragraph::new(Text::from(lines))
.scroll((self.scroll, 0))
.render(area, buf);
}
}
|
