bacon 3.23.0

background rust compiler
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

use {
    crate::Md,
    crokey::{
        KeyCombination,
        crossterm::event::{
            MouseButton,
            MouseEvent,
            MouseEventKind,
        },
        key,
    },
    termimad::Area,
};

pub struct MenuItem<I> {
    pub action: I,
    pub area: Option<Area>,
    pub key: Option<KeyCombination>,
}

pub struct MenuState<I> {
    pub intro: Option<String>,
    pub items: Vec<MenuItem<I>>,
    pub selection: usize,
    pub scroll: usize,
}

impl<I> Default for MenuState<I> {
    fn default() -> Self {
        Self {
            intro: None,
            items: Vec::new(),
            selection: 0,
            scroll: 0,
        }
    }
}

impl<I: Md + Clone> MenuState<I> {
    pub fn set_intro<S: Into<String>>(
        &mut self,
        intro: S,
    ) {
        self.intro = Some(intro.into());
    }
    pub fn add_item(
        &mut self,
        action: I,
        key: Option<KeyCombination>,
    ) {
        self.items.push(MenuItem {
            action,
            area: None,
            key,
        });
    }
    pub fn clear_item_areas(&mut self) {
        for item in &mut self.items {
            item.area = None;
        }
    }
    pub fn select(
        &mut self,
        selection: usize,
    ) {
        self.selection = selection.min(self.items.len());
    }
    pub(crate) fn fix_scroll(
        &mut self,
        page_height: usize,
    ) {
        let len = self.items.len();
        let sel = self.selection;
        if len <= page_height || sel < 3 || sel <= page_height / 2 {
            self.scroll = 0;
        } else if sel + 3 >= len {
            self.scroll = len - page_height;
        } else {
            self.scroll = (sel - 2).min(len - page_height);
        }
    }
    /// Handle a key event (not triggering the actions on their keys, only apply
    /// the menu mechanics).
    ///
    /// Return an optional action and a bool telling whether the event was
    ///  consumed by the menu.
    pub fn on_key(
        &mut self,
        key: KeyCombination,
    ) -> (Option<I>, bool) {
        let items = &self.items;
        if key == key!(down) {
            self.selection = (self.selection + 1) % items.len();
            return (None, true);
        } else if key == key!(up) {
            self.selection = (self.selection + items.len() - 1) % items.len();
            return (None, true);
        } else if key == key!(enter) {
            return (Some(items[self.selection].action.clone()), true);
        }
        for item in &self.items {
            if item.key == Some(key) {
                return (Some(item.action.clone()), true);
            }
        }
        (None, false)
    }
    pub fn item_idx_at(
        &self,
        x: u16,
        y: u16,
    ) -> Option<usize> {
        for (idx, item) in self.items.iter().enumerate() {
            if let Some(area) = &item.area {
                if area.contains(x, y) {
                    return Some(idx);
                }
            }
        }
        None
    }
    /// handle a mouse event, returning the triggered action if any (on
    /// double click only)
    pub fn on_mouse_event(
        &mut self,
        mouse_event: MouseEvent,
        double_click: bool,
    ) -> Option<I> {
        let is_click = matches!(
            mouse_event.kind,
            MouseEventKind::Down(MouseButton::Left) | MouseEventKind::Up(MouseButton::Left),
        );
        if is_click {
            if let Some(selection) = self.item_idx_at(mouse_event.column, mouse_event.row) {
                self.selection = selection;
                if double_click {
                    return Some(self.items[self.selection].action.clone());
                }
            }
        }
        None
    }
}