1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
|
use crate::interactive::CursorDirection;
use crosstermion::{input::Key, input::Key::*};
use std::{
borrow::Borrow,
cell::{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 key(&mut self, key: Key) {
match key {
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 (texts, num_lines) = {
let num_lines = Cell::new(0u16);
let count = |n| num_lines.set(num_lines.get() + n);
let lines = RefCell::new(Vec::with_capacity(30));
let spacer = || {
count(2);
lines.borrow_mut().push(Span::from("\n\n"));
};
let title = |name| {
count(2);
lines.borrow_mut().push(Span::styled(
format!("{}\n\n", name),
Style {
add_modifier: Modifier::BOLD | Modifier::UNDERLINED,
..Default::default()
},
));
};
let hotkey = |keys, description, other_line: Option<&str>| {
let separator_size = 3;
let column_size = 11 + separator_size;
count(1 + other_line.iter().count() as u16);
lines.borrow_mut().push(Span::styled(
format!(
"{:>column_size$}",
keys,
column_size = column_size - separator_size
),
Style {
fg: Color::Green.into(),
..Default::default()
},
));
lines
.borrow_mut()
.push(Span::from(format!(" => {}\n", description)));
if let Some(second_line) = other_line {
lines.borrow_mut().push(Span::from(format!(
"{:>column_size$}{}\n",
"",
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);
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!"),
);
spacer();
}
title("Keys for application control");
{
hotkey(
"Ctrl + c",
"close the application. No questions asked!",
None,
);
spacer();
}
(lines.into_inner(), num_lines.get())
};
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(num_lines.saturating_sub(area.height));
Paragraph::new(Text::from(Spans::from(texts)))
.scroll((self.scroll, 0))
.render(area, buf);
}
}
|