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
use std::io;
use std::collections::HashMap;
use backend::Backend;
use buffer::Buffer;
use layout::{split, Group, Rect};
use widgets::Widget;
#[derive(Debug)]
pub struct LayoutEntry {
chunks: Vec<Rect>,
hot: bool,
}
#[derive(Debug)]
pub struct Terminal<B>
where
B: Backend,
{
backend: B,
layout_cache: HashMap<(Group, Rect), LayoutEntry>,
buffers: [Buffer; 2],
current: usize,
}
impl<B> Terminal<B>
where
B: Backend,
{
pub fn new(backend: B) -> Result<Terminal<B>, io::Error> {
let size = try!(backend.size());
Ok(Terminal {
backend: backend,
layout_cache: HashMap::new(),
buffers: [Buffer::empty(size), Buffer::empty(size)],
current: 0,
})
}
pub fn backend(&self) -> &B {
&self.backend
}
pub fn backend_mut(&mut self) -> &mut B {
&mut self.backend
}
pub fn compute_layout(&mut self, group: &Group, area: &Rect) -> Vec<Rect> {
let entry = self.layout_cache
.entry((group.clone(), *area))
.or_insert_with(|| {
let chunks = split(area, &group.direction, group.margin, &group.sizes);
debug!(
"New layout computed:\n* Group = {:?}\n* Chunks = {:?}",
group, chunks
);
LayoutEntry {
chunks: chunks,
hot: true,
}
});
entry.hot = true;
entry.chunks.clone()
}
pub fn flush(&mut self) -> Result<(), io::Error> {
let width = self.buffers[self.current].area.width;
let content = self.buffers[self.current]
.content
.iter()
.zip(self.buffers[1 - self.current].content.iter())
.enumerate()
.filter_map(|(i, (c, p))| {
if c != p {
let i = i as u16;
let x = i % width;
let y = i / width;
Some((x, y, c))
} else {
None
}
});
self.backend.draw(content)
}
pub fn render<W>(&mut self, widget: &mut W, area: &Rect)
where
W: Widget,
{
widget.draw(area, &mut self.buffers[self.current]);
}
pub fn resize(&mut self, area: Rect) -> Result<(), io::Error> {
self.buffers[self.current].resize(area);
self.buffers[1 - self.current].resize(area);
self.buffers[1 - self.current].reset();
self.layout_cache.clear();
self.backend.clear()
}
pub fn draw(&mut self) -> Result<(), io::Error> {
self.flush()?;
let hot = self.layout_cache
.drain()
.filter(|&(_, ref v)| v.hot)
.collect::<Vec<((Group, Rect), LayoutEntry)>>();
for (key, value) in hot {
self.layout_cache.insert(key, value);
}
for e in self.layout_cache.values_mut() {
e.hot = false;
}
self.buffers[1 - self.current].reset();
self.current = 1 - self.current;
self.backend.flush()?;
Ok(())
}
pub fn hide_cursor(&mut self) -> Result<(), io::Error> {
self.backend.hide_cursor()
}
pub fn show_cursor(&mut self) -> Result<(), io::Error> {
self.backend.show_cursor()
}
pub fn clear(&mut self) -> Result<(), io::Error> {
self.backend.clear()
}
pub fn size(&self) -> Result<Rect, io::Error> {
self.backend.size()
}
}