1use gpui::{hsla, point, px, BoxShadow};
 2use smallvec::{smallvec, SmallVec};
 3
 4#[doc = include_str!("docs/elevation.md")]
 5#[derive(Debug, Clone, Copy, PartialEq, Eq)]
 6pub enum Elevation {
 7    ElevationIndex(ElevationIndex),
 8    LayerIndex(LayerIndex),
 9    ElementIndex(ElementIndex),
10}
11
12#[derive(Debug, Clone, Copy, PartialEq, Eq)]
13pub enum ElevationIndex {
14    Background,
15    Surface,
16    ElevatedSurface,
17    Wash,
18    ModalSurface,
19    DraggedElement,
20}
21
22impl ElevationIndex {
23    pub fn shadow(self) -> SmallVec<[BoxShadow; 2]> {
24        match self {
25            ElevationIndex::Surface => smallvec![],
26
27            ElevationIndex::ElevatedSurface => smallvec![BoxShadow {
28                color: hsla(0., 0., 0., 0.12),
29                offset: point(px(0.), px(2.)),
30                blur_radius: px(3.),
31                spread_radius: px(0.),
32            }],
33
34            ElevationIndex::ModalSurface => smallvec![
35                BoxShadow {
36                    color: hsla(0., 0., 0., 0.12),
37                    offset: point(px(0.), px(2.)),
38                    blur_radius: px(3.),
39                    spread_radius: px(0.),
40                },
41                BoxShadow {
42                    color: hsla(0., 0., 0., 0.08),
43                    offset: point(px(0.), px(3.)),
44                    blur_radius: px(6.),
45                    spread_radius: px(0.),
46                },
47                BoxShadow {
48                    color: hsla(0., 0., 0., 0.04),
49                    offset: point(px(0.), px(6.)),
50                    blur_radius: px(12.),
51                    spread_radius: px(0.),
52                },
53            ],
54
55            _ => smallvec![],
56        }
57    }
58}
59
60#[derive(Debug, Clone, Copy, PartialEq, Eq)]
61pub enum LayerIndex {
62    BehindElement,
63    Element,
64    ElevatedElement,
65}
66
67/// An appropriate z-index for the given layer based on its intended usage.
68#[derive(Debug, Clone, Copy, PartialEq, Eq)]
69pub enum ElementIndex {
70    Effect,
71    Background,
72    Tint,
73    Highlight,
74    Content,
75    Overlay,
76}