vizia_core/views/
spinbox.rs

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
175
176
177
178
179
180
181
182
183
use crate::icons::{
    ICON_CHEVRON_DOWN, ICON_CHEVRON_LEFT, ICON_CHEVRON_RIGHT, ICON_CHEVRON_UP, ICON_MINUS,
    ICON_PLUS,
};
use crate::prelude::*;

pub(crate) enum SpinboxEvent {
    Increment,
    Decrement,
}

/// A view which represents a value which can be incremented or decremented.
#[derive(Lens)]
pub struct Spinbox {
    orientation: Orientation,
    icons: SpinboxIcons,

    on_decrement: Option<Box<dyn Fn(&mut EventContext) + Send + Sync>>,
    on_increment: Option<Box<dyn Fn(&mut EventContext) + Send + Sync>>,
}

/// And enum which represents the icons that can be used for the increment and decrement buttons of the [Spinbox].
#[derive(Clone, Copy, Debug, PartialEq, Data)]
pub enum SpinboxIcons {
    /// A plus icon for the increment button and a minus icon for the decrement button.
    PlusMinus,
    /// A right chevron for the increment button and a left chevron for the decrement button.
    Chevrons,
}

impl_res_simple!(SpinboxIcons);

impl Spinbox {
    /// Creates a new [Spinbox] view.
    pub fn new<L>(cx: &mut Context, lens: L) -> Handle<Spinbox>
    where
        L: Lens<Target: Data + ToStringLocalized>,
    {
        Self::custom(cx, move |cx| Label::new(cx, lens))
    }

    /// Creates a custom [Spinbox] view with the given content to represent the value.
    pub fn custom<F, V>(cx: &mut Context, content: F) -> Handle<Spinbox>
    where
        F: Fn(&mut Context) -> Handle<V>,
        V: 'static + View,
    {
        Self {
            orientation: Orientation::Horizontal,
            icons: SpinboxIcons::Chevrons,
            on_decrement: None,
            on_increment: None,
        }
        .build(cx, move |cx| {
            Binding::new(cx, Spinbox::orientation, move |cx, spinbox_kind| {
                match spinbox_kind.get(cx) {
                    Orientation::Horizontal => {
                        Button::new(cx, |cx| {
                            Svg::new(
                                cx,
                                Spinbox::icons.map(|icons| match icons {
                                    SpinboxIcons::PlusMinus => ICON_MINUS,
                                    SpinboxIcons::Chevrons => ICON_CHEVRON_LEFT,
                                }),
                            )
                        })
                        .on_press(|ex| ex.emit(SpinboxEvent::Decrement))
                        .navigable(true)
                        .class("spinbox-button");
                    }

                    Orientation::Vertical => {
                        Button::new(cx, |cx| {
                            Svg::new(
                                cx,
                                Spinbox::icons.map(|icons| match icons {
                                    SpinboxIcons::PlusMinus => ICON_PLUS,
                                    SpinboxIcons::Chevrons => ICON_CHEVRON_UP,
                                }),
                            )
                        })
                        .on_press(|ex| ex.emit(SpinboxEvent::Increment))
                        .navigable(true)
                        .class("spinbox-button");
                    }
                }
            });
            (content)(cx).class("spinbox-value");
            Binding::new(cx, Spinbox::orientation, move |cx, spinbox_kind| {
                match spinbox_kind.get(cx) {
                    Orientation::Horizontal => {
                        Button::new(cx, |cx| {
                            Svg::new(
                                cx,
                                Spinbox::icons.map(|icons| match icons {
                                    SpinboxIcons::PlusMinus => ICON_PLUS,
                                    SpinboxIcons::Chevrons => ICON_CHEVRON_RIGHT,
                                }),
                            )
                        })
                        .on_press(|ex| ex.emit(SpinboxEvent::Increment))
                        .navigable(true)
                        .class("spinbox-button");
                    }

                    Orientation::Vertical => {
                        Button::new(cx, |cx| {
                            Svg::new(
                                cx,
                                Spinbox::icons.map(|icons| match icons {
                                    SpinboxIcons::PlusMinus => ICON_MINUS,
                                    SpinboxIcons::Chevrons => ICON_CHEVRON_DOWN,
                                }),
                            )
                        })
                        .on_press(|ex| ex.emit(SpinboxEvent::Decrement))
                        .navigable(true)
                        .class("spinbox-button");
                    }
                }
            });
        })
        .toggle_class("horizontal", Spinbox::orientation.map(|o| o == &Orientation::Horizontal))
        .toggle_class("vertical", Spinbox::orientation.map(|o| o == &Orientation::Vertical))
        .navigable(true)
    }
}

impl Handle<'_, Spinbox> {
    /// Sets the callback which is triggered when the [Spinbox] value is incremented.
    pub fn on_increment<F>(self, callback: F) -> Self
    where
        F: 'static + Fn(&mut EventContext) + Send + Sync,
    {
        self.modify(|spinbox: &mut Spinbox| spinbox.on_increment = Some(Box::new(callback)))
    }

    /// Sets the callback which is triggered when the [Spinbox] value is decremented.
    pub fn on_decrement<F>(self, callback: F) -> Self
    where
        F: 'static + Fn(&mut EventContext) + Send + Sync,
    {
        self.modify(|spinbox: &mut Spinbox| spinbox.on_decrement = Some(Box::new(callback)))
    }

    /// Sets the orientation of the [Spinbox].
    pub fn orientation(self, orientation: impl Res<Orientation>) -> Self {
        self.bind(orientation, move |handle, orientation| {
            let orientation = orientation.get(&handle);
            handle.modify(move |spinbox| spinbox.orientation = orientation);
        })
    }

    /// Set the icons which should be used for the increment and decrement buttons of the [Spinbox]
    pub fn icons(self, icons: impl Res<SpinboxIcons>) -> Self {
        self.bind(icons, move |handle, icons| {
            let icons = icons.get(&handle);
            handle.modify(move |spinbox| spinbox.icons = icons);
        })
    }
}

impl View for Spinbox {
    fn element(&self) -> Option<&'static str> {
        Some("spinbox")
    }

    fn event(&mut self, cx: &mut EventContext, event: &mut Event) {
        event.map(|spinbox_event, _| match spinbox_event {
            SpinboxEvent::Increment => {
                if let Some(callback) = &self.on_increment {
                    (callback)(cx)
                }
            }

            SpinboxEvent::Decrement => {
                if let Some(callback) = &self.on_decrement {
                    (callback)(cx)
                }
            }
        });
    }
}