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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174

use crate::direction::Direction;
use crate::event::{Event, EventResult, Key, MouseButton, MouseEvent};
use crate::theme::ColorStyle;
use crate::view::View;
use crate::Cursive;
use crate::Printer;
use crate::Vec2;
use crate::With;
use std::rc::Rc;

/// Checkable box.
///
/// # Examples
///
/// ```
/// use cursive_core::views::Checkbox;
/// use cursive_core::traits::Identifiable;
///
/// let checkbox = Checkbox::new().checked().with_name("check");
/// ```
pub struct Checkbox {
    checked: bool,
    enabled: bool,

    on_change: Option<Rc<dyn Fn(&mut Cursive, bool)>>,
}

new_default!(Checkbox);

impl Checkbox {
    impl_enabled!(self.enabled);

    /// Creates a new, unchecked checkbox.
    pub fn new() -> Self {
        Checkbox {
            checked: false,
            enabled: true,
            on_change: None,
        }
    }

    /// Sets a callback to be used when the state changes.
    pub fn set_on_change<F: 'static + Fn(&mut Cursive, bool)>(
        &mut self,
        on_change: F,
    ) {
        self.on_change = Some(Rc::new(on_change));
    }

    /// Sets a callback to be used when the state changes.
    ///
    /// Chainable variant.
    pub fn on_change<F: 'static + Fn(&mut Cursive, bool)>(
        self,
        on_change: F,
    ) -> Self {
        self.with(|s| s.set_on_change(on_change))
    }

    /// Toggles the checkbox state.
    pub fn toggle(&mut self) -> EventResult {
        let checked = !self.checked;
        self.set_checked(checked)
    }

    /// Check the checkbox.
    pub fn check(&mut self) -> EventResult {
        self.set_checked(true)
    }

    /// Check the checkbox.
    ///
    /// Chainable variant.
    pub fn checked(self) -> Self {
        self.with(|s| {
            s.check();
        })
    }

    /// Returns `true` if the checkbox is checked.
    ///
    /// # Examples
    ///
    /// ```
    /// use cursive_core::views::Checkbox;
    ///
    /// let mut checkbox = Checkbox::new().checked();
    /// assert!(checkbox.is_checked());
    ///
    /// checkbox.uncheck();
    /// assert!(!checkbox.is_checked());
    /// ```
    pub fn is_checked(&self) -> bool {
        self.checked
    }

    /// Uncheck the checkbox.
    pub fn uncheck(&mut self) -> EventResult {
        self.set_checked(false)
    }

    /// Uncheck the checkbox.
    ///
    /// Chainable variant.
    pub fn unchecked(self) -> Self {
        self.with(|s| {
            s.uncheck();
        })
    }

    /// Sets the checkbox state.
    pub fn set_checked(&mut self, checked: bool) -> EventResult {
        self.checked = checked;
        if let Some(ref on_change) = self.on_change {
            let on_change = Rc::clone(on_change);
            EventResult::with_cb(move |s| on_change(s, checked))
        } else {
            EventResult::Consumed(None)
        }
    }

    /// Set the checkbox state.
    ///
    /// Chainable variant.
    pub fn with_checked(self, is_checked: bool) -> Self {
        self.with(|s| {
            s.set_checked(is_checked);
        })
    }

    fn draw_internal(&self, printer: &Printer) {
        printer.print((0, 0), "[ ]");
        if self.checked {
            printer.print((1, 0), "X");
        }
    }
}

impl View for Checkbox {
    fn required_size(&mut self, _: Vec2) -> Vec2 {
        Vec2::new(3, 1)
    }

    fn take_focus(&mut self, _: Direction) -> bool {
        self.enabled
    }

    fn draw(&self, printer: &Printer) {
        if self.enabled && printer.enabled {
            printer.with_selection(printer.focused, |printer| {
                self.draw_internal(printer)
            });
        } else {
            printer.with_color(ColorStyle::secondary(), |printer| {
                self.draw_internal(printer)
            });
        }
    }

    fn on_event(&mut self, event: Event) -> EventResult {
        if !self.enabled {
            return EventResult::Ignored;
        }
        match event {
            Event::Key(Key::Enter) | Event::Char(' ') => self.toggle(),
            Event::Mouse {
                event: MouseEvent::Release(MouseButton::Left),
                position,
                offset,
            } if position.fits_in_rect(offset, (3, 1)) => self.toggle(),
            _ => EventResult::Ignored,
        }
    }
}