mirui 0.46.3

A lightweight, no_std ECS-driven UI framework for embedded, mobile, desktop, and WebAssembly
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

#[cfg(feature = "std")]
use crate::app::plugins::StdInstantClockPlugin;
use crate::prelude::*;
use crate::ui::widgets::{ParagraphStyle, Slider, Text};

use alloc::format;

#[derive(Clone, Copy, Default)]
struct Stats {
    pub last_value: i32,
    pub changes: u32,
    pub drags: u32,
}

/// Slider 0..100 with `on ValueChanged / DragStarted / DragEnded` callbacks.
///
/// # Required plugins
/// - [`StdInstantClockPlugin`] — gesture timing
///
#[compose]
pub fn build_widgets() {
    let stats = Signal::new(Stats::default());
    let (s_value_text, s_read, s_value, s_drag_started, s_drag_ended) = (
        stats.clone(),
        stats.clone(),
        stats.clone(),
        stats.clone(),
        stats.clone(),
    );

    //~focus-start
    ui! {
        Column (
            grow: 1.0,
            align: AlignItems::Center,
            justify: JustifyContent::Center,
            padding: Padding::all(20),
            row_gap: 14
        ) {
            Text (
                text: ${ format!("VALUE  {:03}", s_value_text.get().last_value) },
                width: Dimension::percent(100),
                max_width: 480,
                height: 44,
                font_size: 22,
                text_color: ColorToken::OnSurface,
                paragraph: ParagraphStyle::label()
            )
            Text (
                text: ${
                    format!(
                        "CHANGES  {:02}   ·   DRAG EDGES  {:02}", s_read.get().changes, s_read.get()
                        .drags
                    )
                },
                id: "stats_label",
                width: Dimension::percent(100),
                max_width: 480,
                height: 32,
                font_size: 11,
                text_color: ColorToken::OnSurfaceVariant,
                paragraph: ParagraphStyle::label()
            )
            Slider (
                width: Dimension::percent(100),
                max_width: 480,
                height: 32,
                min: Fixed::ZERO,
                max: Fixed::from_int(100),
                value: Fixed::ZERO
            ) on ValueChanged {
                let new_value = new.to_int();
                let _ = old;
                s_value
                    .update(|s| {
                        s.last_value = new_value;
                        s.changes += 1;
                    });
            } on DragStarted {
                s_drag_started
                    .update(|s| {
                        s.drags += 1;
                    });
            } on DragEnded {
                s_drag_ended
                    .update(|s| {
                        s.drags += 1;
                    });
            }
        }
    };
    //~focus-end
}

#[cfg(feature = "std")]
pub fn setup_app<B, F>(app: &mut App<B, F>, parent: Entity)
where
    B: Surface,
    F: RendererFactory<B>,
{
    app.add_plugin(StdInstantClockPlugin);
    app.compose(parent, build_widgets);
}

pub const DEMO_SIZE: crate::gallery::DemoSize = crate::gallery::DemoSize::at_most(720, 320);

#[cfg(test)]
mod tests {
    use super::*;
    use crate::ui::Children;
    use crate::ui::IdMap;
    use crate::ui::UiScope;

    #[test]
    fn build_widgets_smoke() {
        let mut world = World::new();
        world.insert_resource(IdMap::new());
        let parent = WidgetBuilder::new(&mut world).id();
        let mut cx = UiScope::new(&mut world, parent);
        build_widgets(&mut cx);
        drop(cx);
        assert!(
            world
                .get::<Children>(parent)
                .is_some_and(|c| !c.0.is_empty())
        );
        // The reactive Text's first run must seed real content at build time,
        // not leave the label empty until the first event.
        let label = world.find_by_id("stats_label").expect("stats_label exists");
        let text = world.get::<Text>(label).expect("label has Text");
        assert!(
            !text.resolve(&world).is_empty(),
            "reactive Text shows its initial value"
        );
    }
}