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
|
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
//! CSS handling for the computed value of
//! [`position`][position] values.
//!
//! [position]: https://drafts.csswg.org/css-backgrounds-3/#position
use crate::values::computed::{Integer, LengthPercentage, NonNegativeNumber, Percentage};
use crate::values::generics::position::AspectRatio as GenericAspectRatio;
use crate::values::generics::position::Position as GenericPosition;
use crate::values::generics::position::PositionComponent as GenericPositionComponent;
use crate::values::generics::position::PositionOrAuto as GenericPositionOrAuto;
use crate::values::generics::position::Ratio as GenericRatio;
use crate::values::generics::position::ZIndex as GenericZIndex;
pub use crate::values::specified::position::{GridAutoFlow, GridTemplateAreas, MasonryAutoFlow};
use crate::{One, Zero};
use std::cmp::{Ordering, PartialOrd};
use std::fmt::{self, Write};
use style_traits::{CssWriter, ToCss};
/// The computed value of a CSS `<position>`
pub type Position = GenericPosition<HorizontalPosition, VerticalPosition>;
/// The computed value of an `auto | <position>`
pub type PositionOrAuto = GenericPositionOrAuto<Position>;
/// The computed value of a CSS horizontal position.
pub type HorizontalPosition = LengthPercentage;
/// The computed value of a CSS vertical position.
pub type VerticalPosition = LengthPercentage;
impl Position {
/// `50% 50%`
#[inline]
pub fn center() -> Self {
Self::new(
LengthPercentage::new_percent(Percentage(0.5)),
LengthPercentage::new_percent(Percentage(0.5)),
)
}
/// `0% 0%`
#[inline]
pub fn zero() -> Self {
Self::new(LengthPercentage::zero(), LengthPercentage::zero())
}
}
impl ToCss for Position {
fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
where
W: Write,
{
self.horizontal.to_css(dest)?;
dest.write_str(" ")?;
self.vertical.to_css(dest)
}
}
impl GenericPositionComponent for LengthPercentage {
fn is_center(&self) -> bool {
match self.to_percentage() {
Some(Percentage(per)) => per == 0.5,
_ => false,
}
}
}
/// A computed value for the `z-index` property.
pub type ZIndex = GenericZIndex<Integer>;
/// A computed <ratio> value.
pub type Ratio = GenericRatio<NonNegativeNumber>;
impl PartialOrd for Ratio {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
f64::partial_cmp(
&((self.0).0 as f64 * (other.1).0 as f64),
&((self.1).0 as f64 * (other.0).0 as f64),
)
}
}
impl Ratio {
/// Returns a new Ratio.
pub fn new(a: f32, b: f32) -> Self {
GenericRatio(a.into(), b.into())
}
/// Returns the used value. A ratio of 0/0 behaves as the ratio 1/0.
/// https://drafts.csswg.org/css-values-4/#ratios
pub fn used_value(self) -> Self {
if self.0.is_zero() && self.1.is_zero() {
Ratio::new(One::one(), Zero::zero())
} else {
self
}
}
}
/// A computed value for the `aspect-ratio` property.
pub type AspectRatio = GenericAspectRatio<NonNegativeNumber>;
|
