dces 0.3.1

DCES entity component system
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

use dces::prelude::*;

#[derive(Default)]
struct Size {
    width: u32,
    height: u32,
}

#[derive(Default)]
struct Name(String);

#[derive(Default)]
struct Depth(u32);

pub struct SizeSystem {
    source: Entity,
}

impl System<EntityStore, PhantomContext> for SizeSystem {
    fn run(&self, ecm: &mut EntityComponentManager<EntityStore>) {
        if let Ok(comp) = ecm
            .component_store_mut()
            .get_mut::<Size>("size", self.source)
        {
            comp.width += 1;
            comp.height += 1;
        }
    }
}

pub struct PrintSystem;
impl System<EntityStore, PhantomContext> for PrintSystem {
    fn run(&self, ecm: &mut EntityComponentManager<EntityStore>) {
        let (e_store, c_store) = ecm.stores();

        for entity in &e_store.inner {
            if let Ok(name) = c_store.get::<Name>("name", *entity) {
                if let Ok(size) = c_store.get::<Size>("size", *entity) {
                    println!(
                        "entity: {}; name: {}; width: {}; height: {}",
                        entity.0, name.0, size.width, size.height
                    );
                }
            }
        }
    }
}

fn main() {
    let mut world = World::from_entity_store(EntityStore::default());

    let source = world
        .create_entity()
        .components(
            ComponentBuilder::new()
                .with("name", Name(String::from("Button")))
                .with("depth", Depth(4))
                .with(
                    "size",
                    Size {
                        width: 5,
                        height: 5,
                    },
                )
                .build(),
        )
        .build();

    world
        .create_entity()
        .components(
            ComponentBuilder::new()
                .with("name", Name(String::from("CheckBox")))
                .with("depth", Depth(1))
                .with_shared::<Size>("size", source)
                .build(),
        )
        .build();

    world.create_system(PrintSystem).with_priority(1).build();

    world
        .create_system(SizeSystem { source })
        .with_priority(0)
        .build();

    world.run();
}