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

pub trait Selectable {
    /// True iff the content is empty
    fn is_empty(&self) -> bool;
    /// Number of element in content
    fn len(&self) -> usize;
    /// Select next element in content
    fn next(&mut self);
    /// Select previous element in content
    fn prev(&mut self);
    /// Current index of selected element.
    /// 0 if the content is empty (I know, could be an option)
    fn index(&self) -> usize;
    /// set the index to the value if possible
    fn set_index(&mut self, index: usize);
}

pub trait Content<T>: Selectable {
    /// Returns the selected element if content isn't empty
    fn selected(&self) -> Option<&T>;
    /// Reference to the content as a vector.
    fn content(&self) -> &Vec<T>;
    /// add an element to the content
    fn push(&mut self, t: T);
    /// [`tuikit::attr:Attr`] used to display an element
    fn attr(&self, index: usize, attr: &tuikit::attr::Attr) -> tuikit::attr::Attr;
}
/// Implement the `SelectableContent` for struct `$struc` with content type `$content_type`.
/// This trait allows to navigate through a vector of element `content_type`.
/// It implements: `is_empty`, `len`, `next`, `prev`, `selected`.
/// `selected` returns an optional reference to the value.
#[macro_export]
macro_rules! impl_selectable {
    ($struct:ident) => {
        use $crate::modes::Selectable;

        /// Implement a selectable content for this struct.
        /// This trait allows to navigate through a vector of element `content_type`.
        /// It implements: `is_empty`, `len`, `next`, `prev`, `selected`.
        /// `selected` returns an optional reference to the value.
        impl Selectable for $struct {
            /// True if the content is empty.
            fn is_empty(&self) -> bool {
                self.content.is_empty()
            }

            /// The size of the content.
            fn len(&self) -> usize {
                self.content.len()
            }

            /// Select the prev item.
            fn prev(&mut self) {
                if self.is_empty() {
                    self.index = 0
                } else if self.index > 0 {
                    self.index -= 1;
                } else {
                    self.index = self.len() - 1
                }
            }

            /// Select the next item.
            fn next(&mut self) {
                if self.is_empty() {
                    self.index = 0;
                } else {
                    self.index = (self.index + 1) % self.len()
                }
            }

            /// Returns the index of the selected item.
            fn index(&self) -> usize {
                self.index
            }

            /// Set the index to a new value if the value is below the length.
            fn set_index(&mut self, index: usize) {
                if index < self.len() {
                    self.index = index;
                }
            }
        }
    };
}

/// Implement the `SelectableContent` for struct `$struc` with content type `$content_type`.
/// This trait allows to navigate through a vector of element `content_type`.
/// It implements: `is_empty`, `len`, `next`, `prev`, `selected`.
/// `selected` returns an optional reference to the value.
#[macro_export]
macro_rules! impl_content {
    ($content_type:ident, $struct:ident) => {
        use $crate::modes::Content;

        /// Implement a selectable content for this struct.
        /// This trait allows to navigate through a vector of element `content_type`.
        /// It implements: `is_empty`, `len`, `next`, `prev`, `selected`.
        /// `selected` returns an optional reference to the value.
        impl Content<$content_type> for $struct {
            /// Returns a reference to the selected content.
            fn selected(&self) -> Option<&$content_type> {
                match self.is_empty() {
                    true => None,
                    false => Some(&self.content[self.index]),
                }
            }

            /// A reference to the content.
            fn content(&self) -> &Vec<$content_type> {
                &self.content
            }

            /// Reverse the received effect if the index match the selected index.
            fn attr(&self, index: usize, attr: &tuikit::attr::Attr) -> tuikit::attr::Attr {
                let mut attr = *attr;
                if index == self.index() {
                    attr.effect |= tuikit::attr::Effect::REVERSE;
                }
                attr
            }

            fn push(&mut self, element: $content_type) {
                self.content.push(element)
            }
        }
    };
}