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
|
use std::cell::RefCell;
use std::rc::Rc;
use glib;
use gtk;
use gtk::prelude::*;
use crate::nvim_bridge::CompletionItem;
use crate::ui::color::Color;
use crate::ui::popupmenu::CompletionItemWidgetWrap;
struct State {
items: Vec<CompletionItemWidgetWrap>,
items_to_load: Vec<CompletionItem>,
show_kind: bool,
source_id: Option<glib::SourceId>,
/// Once we're loaded some (or all) data, this closure gets called if
/// one exists. The first value in the tuple can is indication on the
/// number of items needed before calling the closure.
once_loaded:
Option<(Option<i32>, Box<dyn Fn(&Vec<CompletionItemWidgetWrap>)>)>,
list: gtk::ListBox,
css_provider: gtk::CssProvider,
}
impl State {
fn clear(&mut self) {
if let Some(source_id) = self.source_id.take() {
glib::source::source_remove(source_id);
}
while let Some(item) = self.items.pop() {
item.row.destroy();
}
}
fn new(list: gtk::ListBox, css_provider: gtk::CssProvider) -> Self {
State {
items: vec![],
items_to_load: vec![],
once_loaded: None,
source_id: None,
list,
css_provider,
show_kind: false,
}
}
}
pub struct LazyLoader {
state: Rc<RefCell<State>>,
}
impl LazyLoader {
pub fn new(list: gtk::ListBox, css_provider: gtk::CssProvider) -> Self {
Self {
state: Rc::new(RefCell::new(State::new(list, css_provider))),
}
}
pub fn get_show_kind(&self) -> bool {
self.state.borrow().show_kind
}
pub fn set_items(
&mut self,
items: Vec<CompletionItem>,
icon_fg: Color,
size: f64,
show_menu: bool,
) {
let mut state = self.state.borrow_mut();
state.clear();
state.show_kind = items.iter().any(|item| !item.kind.is_unknown());
state.items_to_load = items;
let state_ref = self.state.clone();
let source_id = gtk::idle_add(move || {
let mut state = state_ref.borrow_mut();
// Load the rows in patches so we avoid renders of "half height"
// completion menus.
for _ in 0..40 {
if state.items_to_load.len() == 0 {
state.source_id = None;
if let Some((_, cb)) = state.once_loaded.take() {
cb(&state.items);
}
return Continue(false);
}
let item = state.items_to_load.remove(0);
let widget = CompletionItemWidgetWrap::create(
item,
state.show_kind,
show_menu,
&state.css_provider,
&icon_fg,
size,
);
state.list.add(&widget.row);
widget.row.show_all();
state.items.push(widget);
}
// Check if we have a eager closure to be called.
if let Some((i, cb)) = state.once_loaded.take() {
if let Some(i) = i {
if state.items.len() >= i as usize {
cb(&state.items);
} else {
// Not ready yet, put the items back.
state.once_loaded = Some((Some(i), cb));
}
} else {
// Not ready yet, put the items back.
state.once_loaded = Some((i, cb));
}
}
Continue(true)
});
state.source_id = Some(source_id);
state.list.show_all();
}
/// Calls `f` once `i` mount if items (or all items) are loaded.
/// Only one callback can exists at a time (e.g. when we are loading
/// items). If all items are already loaded, `f` is called immediately.
pub fn once_loaded<F>(&mut self, i: Option<i32>, f: F)
where
F: Fn(&Vec<CompletionItemWidgetWrap>) + 'static,
{
let mut state = self.state.borrow_mut();
if state.source_id.is_some() {
state.once_loaded = Some((i, Box::new(f)));
} else {
f(&state.items);
}
}
}
|
