appcui 0.4.8

A feature-rich and cross-platform TUI/CUI framework for Rust, enabling modern terminal-based applications on Windows, Linux, and macOS. Includes built-in UI components like buttons, menus, list views, tree views, checkboxes, and more. Perfect for building fast and interactive CLI tools and text-based interfaces.
Documentation 
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

use crate::graphics::Size;

pub trait GraphNode {
    /// Write the label of the node into the provided formatter
    fn write_label(&self, f: &mut dyn std::fmt::Write, size: Size) -> std::fmt::Result;

    /// Optional tooltip/hover text (a description of the node)
    fn write_description(&self, _f: &mut dyn std::fmt::Write) -> std::fmt::Result {
        Ok(())
    }

    /// Returns the prefered size (width and height) for the current Node
    /// This value is being used if the size is not provided via NodeBuilder method .size(...)
    fn prefered_size(&self) -> Size;
}

fn write_text(text: &str, f: &mut dyn std::fmt::Write, size: Size) -> std::fmt::Result {
    let w = size.width.max(1);
    let h = size.height.max(1);
    let mut x = 0;
    let mut y = 0;
    for c in text.chars() {
        f.write_char(c)?;
        if (c == '\n') || (c == '\r') {
            x = 0;
            y += 1;
            if y >= h {
                break;
            }
            continue;
        }
        x += 1;
        if x >= w {
            x = 0;
            y += 1;
            if y >= h {
                break;
            }
            f.write_char('\n')?;
        }
    }
    Ok(())
}
fn compute_text_prefered_size(text: &str) -> Size {
    let mut w = 0u32;
    let mut h = 0u32;
    let mut current_width = 0;
    for c in text.chars() {
        if (c == '\n') || (c == '\r') {
            h += 1;
            if current_width > w {
                w = current_width;
            }
            current_width = 0;
            continue;
        }
        current_width += 1;
    }
    if current_width > w {
        w = current_width;
    }
    if current_width > 0 {
        h += 1;
    }
    Size::new(w, h)
}

impl GraphNode for &str {
    fn prefered_size(&self) -> Size {
        compute_text_prefered_size(self)
    }
    fn write_label(&self, f: &mut dyn std::fmt::Write, size: Size) -> std::fmt::Result {
        write_text(self, f, size)
    }
    fn write_description(&self, f: &mut dyn std::fmt::Write) -> std::fmt::Result {
        f.write_str(self)
    }
}
impl GraphNode for String {
    fn prefered_size(&self) -> Size {
        compute_text_prefered_size(self.as_str())
    }
    fn write_label(&self, f: &mut dyn std::fmt::Write, size: Size) -> std::fmt::Result {
        write_text(self.as_str(), f, size)
    }
    fn write_description(&self, f: &mut dyn std::fmt::Write) -> std::fmt::Result {
        f.write_str(self.as_str())
    }
}

macro_rules! IMPL_GRAPHMODE_FOR_UNSIGNED_INTEGERS {
    ($($t:ty),*) => {
        $(
            impl GraphNode for $t {
                fn prefered_size(&self) -> Size {
                    let mut v = *self;
                    let mut count = 0;
                    loop {
                        v /= 10;
                        count += 1;
                        if v==0 {
                            break;
                        }
                    }
                    Size::new(count, 1)
                }
                fn write_label(&self, f: &mut dyn std::fmt::Write, _: Size) -> std::fmt::Result {
                    write!(f, "{}", self)
                }
                fn write_description(&self, f: &mut dyn std::fmt::Write) -> std::fmt::Result {
                    write!(f, "Dec: {}\nHex: 0x{:X}", self, self)
                }
            }
        )*
    };
}

macro_rules! IMPL_GRAPHMODE_FOR_SIGNED_INTEGERS {
    ($($t:ty),*) => {
        $(
            impl GraphNode for $t {
                fn prefered_size(&self) -> Size {
                    let mut v = *self;
                    let mut count = if v <= 0 { 1 } else { 0 };
                    loop {
                        v /= 10;
                        count += 1;
                        if v==0 {
                            break;
                        }
                    }
                    Size::new(count, 1)
                }
                fn write_label(&self, f: &mut dyn std::fmt::Write, _: Size) -> std::fmt::Result {
                    write!(f, "{}", self)
                }
                fn write_description(&self, f: &mut dyn std::fmt::Write) -> std::fmt::Result {
                    write!(f, "Dec: {}\nHex: 0x{:X}", self, self)
                }
            }
        )*
    };
}

IMPL_GRAPHMODE_FOR_UNSIGNED_INTEGERS!(u8, u16, u32, u64, usize);
IMPL_GRAPHMODE_FOR_SIGNED_INTEGERS!(i8, i16, i32, i64, isize);