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
|
use crate::compositor::{Component, Compositor, Context, EventResult};
use crossterm::event::{Event, KeyCode, KeyEvent, KeyModifiers};
use tui::buffer::Buffer as Surface;
use tui::{
layout::Rect,
style::{Color, Style},
widgets::{Block, Borders},
};
use std::borrow::Cow;
use helix_core::Position;
use helix_view::Editor;
// TODO: factor out a popup component that we can reuse for displaying docs on autocomplete,
// diagnostics popups, etc.
pub struct Menu<T> {
options: Vec<T>,
cursor: usize,
position: Position,
format_fn: Box<dyn Fn(&T) -> Cow<str>>,
callback_fn: Box<dyn Fn(&mut Editor, Option<&T>, MenuEvent)>,
}
impl<T> Menu<T> {
// TODO: it's like a slimmed down picker, share code? (picker = menu + prompt with different
// rendering)
pub fn new(
options: Vec<T>,
format_fn: impl Fn(&T) -> Cow<str> + 'static,
callback_fn: impl Fn(&mut Editor, Option<&T>, MenuEvent) + 'static,
) -> Self {
Self {
options,
cursor: 0,
position: Position::default(),
format_fn: Box::new(format_fn),
callback_fn: Box::new(callback_fn),
}
}
pub fn set_position(&mut self, pos: Position) {
self.position = pos;
}
pub fn move_up(&mut self) {
self.cursor = self.cursor.saturating_sub(1);
}
pub fn move_down(&mut self) {
// TODO: len - 1
if self.cursor < self.options.len() {
self.cursor += 1;
}
}
pub fn selection(&self) -> Option<&T> {
self.options.get(self.cursor)
}
}
use super::PromptEvent as MenuEvent;
impl<T> Component for Menu<T> {
fn handle_event(&mut self, event: Event, cx: &mut Context) -> EventResult {
let event = match event {
Event::Key(event) => event,
_ => return EventResult::Ignored,
};
let close_fn = EventResult::Consumed(Some(Box::new(
|compositor: &mut Compositor, editor: &mut Editor| {
// remove the layer
compositor.pop();
},
)));
match event {
// esc or ctrl-c aborts the completion and closes the menu
KeyEvent {
code: KeyCode::Esc, ..
}
| KeyEvent {
code: KeyCode::Char('c'),
modifiers: KeyModifiers::CONTROL,
} => {
(self.callback_fn)(cx.editor, self.selection(), MenuEvent::Abort);
return close_fn;
}
// arrow up/ctrl-p/shift-tab prev completion choice (including updating the doc)
KeyEvent {
code: KeyCode::Tab,
modifiers: KeyModifiers::SHIFT,
}
| KeyEvent {
code: KeyCode::Up, ..
}
| KeyEvent {
code: KeyCode::Char('p'),
modifiers: KeyModifiers::CONTROL,
} => {
self.move_up();
(self.callback_fn)(cx.editor, self.selection(), MenuEvent::Update);
return EventResult::Consumed(None);
}
// arrow down/ctrl-n/tab advances completion choice (including updating the doc)
KeyEvent {
code: KeyCode::Tab,
modifiers: KeyModifiers::NONE,
}
| KeyEvent {
code: KeyCode::Down,
..
}
| KeyEvent {
code: KeyCode::Char('n'),
modifiers: KeyModifiers::CONTROL,
} => {
self.move_down();
(self.callback_fn)(cx.editor, self.selection(), MenuEvent::Update);
return EventResult::Consumed(None);
}
KeyEvent {
code: KeyCode::Enter,
..
} => {
(self.callback_fn)(cx.editor, self.selection(), MenuEvent::Validate);
return close_fn;
}
// KeyEvent {
// code: KeyCode::Char(c),
// modifiers: KeyModifiers::NONE,
// } => {
// self.insert_char(c);
// (self.callback_fn)(cx.editor, &self.line, MenuEvent::Update);
// }
// / -> edit_filter?
//
// enter confirms the match and closes the menu
// typing filters the menu
// if we run out of options the menu closes itself
_ => (),
}
// for some events, we want to process them but send ignore, specifically all input except
// tab/enter/ctrl-k or whatever will confirm the selection/ ctrl-n/ctrl-p for scroll.
// EventResult::Consumed(None)
EventResult::Ignored
}
fn render(&self, area: Rect, surface: &mut Surface, cx: &mut Context) {
// render a box at x, y. Width equal to max width of item.
// initially limit to n items, add support for scrolling
//
const MAX: usize = 5;
let rows = std::cmp::min(self.options.len(), MAX) as u16;
let area = Rect::new(self.position.col as u16, self.position.row as u16, 30, rows);
// clear area
let background = cx.editor.theme.get("ui.popup");
for y in area.top()..area.bottom() {
for x in area.left()..area.right() {
let cell = surface.get_mut(x, y);
cell.reset();
// cell.symbol.clear();
cell.set_style(background);
}
}
// -- Render the contents:
let style = Style::default().fg(Color::Rgb(164, 160, 232)); // lavender
let selected = Style::default().fg(Color::Rgb(255, 255, 255));
for (i, option) in self.options.iter().take(rows as usize).enumerate() {
// TODO: set bg for the whole row if selected
surface.set_stringn(
area.x,
area.y + i as u16,
(self.format_fn)(option),
area.width as usize - 1,
if i == self.cursor { selected } else { style },
);
}
}
}
|
