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

use super::*;

pub struct Stack<'a> {
    core: WidgetCore,
    children: Vec<Box<dyn Widget + 'a>>,
}

impl<'a> Deref for Stack<'a> {
    type Target = Vec<Box<dyn Widget + 'a>>;
    fn deref(&self) -> &Self::Target {
        &self.children
    }
}

impl DerefMut for Stack<'_> {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.children
    }
}

pub fn stack<'a>(widgets: Vec<Box<dyn Widget + 'a>>) -> Stack<'a> {
    Stack {
        core: WidgetCore::void(),
        children: widgets,
    }
}

#[macro_export]
macro_rules! stack {
    ($($x:expr,)*) => {
        $crate::stack(vec![$(Box::new($x)),*])
    };
    ($($x:expr),*) => {
        $crate::stack!($($x,)*)
    };
}

impl<'a> Widget for Stack<'a> {
    fn core(&self) -> &WidgetCore {
        &self.core
    }
    fn core_mut(&mut self) -> &mut WidgetCore {
        &mut self.core
    }
    fn calc_constraints(&mut self) {
        self.core_mut().constraints.min_size.x = self
            .children
            .iter()
            .map(|child| child.core().constraints.min_size.x)
            .max_by(|a, b| a.partial_cmp(b).unwrap())
            .unwrap();
        self.core_mut().constraints.min_size.y = self
            .children
            .iter()
            .map(|child| child.core().constraints.min_size.y)
            .max_by(|a, b| a.partial_cmp(b).unwrap())
            .unwrap();
        self.core_mut().constraints.flex.x = self
            .children
            .iter()
            .map(|child| child.core().constraints.flex.x)
            .max_by(|a, b| a.partial_cmp(b).unwrap())
            .unwrap();
        self.core_mut().constraints.flex.y = self
            .children
            .iter()
            .map(|child| child.core().constraints.flex.y)
            .max_by(|a, b| a.partial_cmp(b).unwrap())
            .unwrap();
    }
    fn layout_children(&mut self) {
        for child in &mut self.children {
            child.core_mut().position = self.core.position;
        }
    }
    fn walk_children_mut<'b>(&mut self, mut f: Box<dyn FnMut(&mut dyn Widget) + 'b>) {
        for child in &mut self.children {
            f(child.deref_mut());
        }
    }
}