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

// Copyright 2022 System76 <info@system76.com>
// SPDX-License-Identifier: MPL-2.0

use derive_setters::Setters;
use fraction::{Bounded, Decimal};
use std::hash::Hash;
use std::ops::{Add, Sub};

/// A message emitted by the [`SpinButton`](super) widget.
#[derive(Clone, Copy, Debug, Hash)]
pub enum Message {
    Increment,
    Decrement,
}

#[derive(Setters)]
pub struct Model<T> {
    /// The current value of the spin button.
    #[setters(into)]
    pub value: T,
    /// The amount to increment the value.
    #[setters(into)]
    pub step: T,
    /// The minimum value permitted.
    #[setters(into)]
    pub min: T,
    /// The maximum value permitted.
    #[setters(into)]
    pub max: T,
}

impl<T: 'static> Model<T>
where
    T: Copy + Hash + Sub<Output = T> + Add<Output = T> + Ord,
{
    pub fn update(&mut self, message: Message) {
        self.value = match message {
            Message::Increment => {
                std::cmp::min(std::cmp::max(self.value + self.step, self.min), self.max)
            }
            Message::Decrement => {
                std::cmp::max(std::cmp::min(self.value - self.step, self.max), self.min)
            }
        }
    }
}

impl Default for Model<i8> {
    fn default() -> Self {
        Self {
            value: 0,
            step: 1,
            min: i8::MIN,
            max: i8::MAX,
        }
    }
}

impl Default for Model<i16> {
    fn default() -> Self {
        Self {
            value: 0,
            step: 1,
            min: i16::MIN,
            max: i16::MAX,
        }
    }
}

impl Default for Model<i32> {
    fn default() -> Self {
        Self {
            value: 0,
            step: 1,
            min: i32::MIN,
            max: i32::MAX,
        }
    }
}

impl Default for Model<isize> {
    fn default() -> Self {
        Self {
            value: 0,
            step: 1,
            min: isize::MIN,
            max: isize::MAX,
        }
    }
}

impl Default for Model<u8> {
    fn default() -> Self {
        Self {
            value: 0,
            step: 1,
            min: u8::MIN,
            max: u8::MAX,
        }
    }
}

impl Default for Model<u16> {
    fn default() -> Self {
        Self {
            value: 0,
            step: 1,
            min: u16::MIN,
            max: u16::MAX,
        }
    }
}

impl Default for Model<u32> {
    fn default() -> Self {
        Self {
            value: 0,
            step: 1,
            min: u32::MIN,
            max: u32::MAX,
        }
    }
}

impl Default for Model<usize> {
    fn default() -> Self {
        Self {
            value: 0,
            step: 1,
            min: usize::MIN,
            max: usize::MAX,
        }
    }
}

impl Default for Model<u64> {
    fn default() -> Self {
        Self {
            value: 0,
            step: 1,
            min: u64::MIN,
            max: u64::MAX,
        }
    }
}

impl Default for Model<Decimal> {
    fn default() -> Self {
        Self {
            value: Decimal::from(0.0),
            step: Decimal::from(0.0),
            min: Decimal::min_positive_value(),
            max: Decimal::max_value(),
        }
    }
}