mirui 0.33.1

A lightweight, no_std ECS-driven UI framework for embedded, 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
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

extern crate alloc;

use crate::prelude::*;

use alloc::vec::Vec;

#[derive(Clone)]
struct Card {
    id: u32,
    name: &'static str,
    color: ColorToken,
}

fn deck() -> Vec<Card> {
    alloc::vec![
        Card {
            id: 0,
            name: "Red",
            color: ColorToken::Error
        },
        Card {
            id: 1,
            name: "Green",
            color: ColorToken::Success
        },
        Card {
            id: 2,
            name: "Blue",
            color: ColorToken::Primary
        },
        Card {
            id: 3,
            name: "Gold",
            color: ColorToken::Secondary
        },
    ]
}

pub fn build_widgets(world: &mut World, parent: Entity) {
    let cards = Signal::new(deck());
    let rotate = cards.clone();
    let rows = cards.clone();

    //~focus-start
    ui! {
        :(
            parent: parent
            world: world
        :)

        Column (
            grow: 1.0,
            align: AlignItems::Center,
            justify: JustifyContent::Center,
            padding: Padding::all(12)
        ) {
            View (
                bg_color: ColorToken::Primary,
                text_color: ColorToken::OnPrimary,
                width: 168,
                height: 36,
                border_radius: 8,
                text: "rotate"
            ) on Tap {
                rotate
                    .update(|c| {
                        if !c.is_empty() {
                            let head = c.remove(0);
                            c.push(head);
                        }
                    });
            }
            Column (
                id: "state_keyed_list",
                bg_color: ColorToken::Surface,
                grow: 1.0,
                width: 180,
                border_radius: 8,
                padding: Padding::all(4)
            ) {
                walk ${ rows.get() } with card by card.id {
                    View (
                        bg_color: card.color,
                        text_color: ColorToken::OnPrimary,
                        width: 168,
                        height: 28,
                        border_radius: 6,
                        text: card.name
                    )
                }
            }
        }
    };
    //~focus-end
}

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

#[cfg(test)]
mod tests {
    use super::*;
    use crate::core::reactive::flush_signal_dirty;
    use crate::input::event::GestureHandler;
    use crate::input::event::gesture::GestureEvent;
    use crate::ui::Children;
    use crate::ui::IdMap;

    fn tap(world: &mut World, e: Entity) {
        GestureHandler::trigger(
            world,
            e,
            &GestureEvent::Tap {
                x: Fixed::ZERO,
                y: Fixed::ZERO,
                target: e,
            },
        );
        flush_signal_dirty(world);
    }

    #[test]
    fn rotate_keeps_widget_identity_per_key() {
        let mut world = World::new();
        world.insert_resource(IdMap::new());
        let parent = WidgetBuilder::new(&mut world).id();
        build_widgets(&mut world, parent);

        let col = world.get::<Children>(parent).unwrap().0[0];
        let rotate_btn = world.get::<Children>(col).unwrap().0[0];
        let list = world.get::<Children>(col).unwrap().0[1];

        let before = world.get::<Children>(list).unwrap().0.clone();
        assert_eq!(before.len(), 4, "four cards");
        let row_red = before[0];
        let row_green = before[1];

        // rotate: [Red,Green,Blue,Gold] -> [Green,Blue,Gold,Red]
        tap(&mut world, rotate_btn);

        let after = world.get::<Children>(list).unwrap().0.clone();
        assert_eq!(after.len(), 4, "still four cards");
        // Green moved to front but is the SAME entity (keyed identity)
        assert_eq!(
            after[0], row_green,
            "Green row keeps its entity after rotate"
        );
        // Red moved to the tail, also the same entity
        assert_eq!(after[3], row_red, "Red row keeps its entity, now at tail");
        assert!(
            before.iter().all(|e| after.contains(e)),
            "rotate reuses all rows, builds none"
        );
    }
}