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use crate::eval::{CastInfo, FromValue, IntoValue, Reflect};
use super::*;
/// A container with components for the four corners of a rectangle.
#[derive(Debug, Default, Copy, Clone, Eq, PartialEq, Hash)]
pub struct Corners<T> {
/// The value for the top left corner.
pub top_left: T,
/// The value for the top right corner.
pub top_right: T,
/// The value for the bottom right corner.
pub bottom_right: T,
/// The value for the bottom left corner.
pub bottom_left: T,
}
impl<T> Corners<T> {
/// Create a new instance from the four components.
pub const fn new(top_left: T, top_right: T, bottom_right: T, bottom_left: T) -> Self {
Self { top_left, top_right, bottom_right, bottom_left }
}
/// Create an instance with four equal components.
pub fn splat(value: T) -> Self
where
T: Clone,
{
Self {
top_left: value.clone(),
top_right: value.clone(),
bottom_right: value.clone(),
bottom_left: value,
}
}
/// Map the individual fields with `f`.
pub fn map<F, U>(self, mut f: F) -> Corners<U>
where
F: FnMut(T) -> U,
{
Corners {
top_left: f(self.top_left),
top_right: f(self.top_right),
bottom_right: f(self.bottom_right),
bottom_left: f(self.bottom_left),
}
}
/// Zip two instances into one.
pub fn zip<U>(self, other: Corners<U>) -> Corners<(T, U)> {
Corners {
top_left: (self.top_left, other.top_left),
top_right: (self.top_right, other.top_right),
bottom_right: (self.bottom_right, other.bottom_right),
bottom_left: (self.bottom_left, other.bottom_left),
}
}
/// An iterator over the corners, starting with the top left corner,
/// clockwise.
pub fn iter(&self) -> impl Iterator<Item = &T> {
[&self.top_left, &self.top_right, &self.bottom_right, &self.bottom_left]
.into_iter()
}
/// Whether all sides are equal.
pub fn is_uniform(&self) -> bool
where
T: PartialEq,
{
self.top_left == self.top_right
&& self.top_right == self.bottom_right
&& self.bottom_right == self.bottom_left
}
}
impl<T> Get<Corner> for Corners<T> {
type Component = T;
fn get_ref(&self, corner: Corner) -> &T {
match corner {
Corner::TopLeft => &self.top_left,
Corner::TopRight => &self.top_right,
Corner::BottomRight => &self.bottom_right,
Corner::BottomLeft => &self.bottom_left,
}
}
fn get_mut(&mut self, corner: Corner) -> &mut T {
match corner {
Corner::TopLeft => &mut self.top_left,
Corner::TopRight => &mut self.top_right,
Corner::BottomRight => &mut self.bottom_right,
Corner::BottomLeft => &mut self.bottom_left,
}
}
}
/// The four corners of a rectangle.
#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
pub enum Corner {
/// The top left corner.
TopLeft,
/// The top right corner.
TopRight,
/// The bottom right corner.
BottomRight,
/// The bottom left corner.
BottomLeft,
}
impl<T: Reflect> Reflect for Corners<Option<T>> {
fn describe() -> CastInfo {
T::describe() + Dict::describe()
}
fn castable(value: &Value) -> bool {
Dict::castable(value) || T::castable(value)
}
}
impl<T> IntoValue for Corners<T>
where
T: PartialEq + IntoValue,
{
fn into_value(self) -> Value {
if self.is_uniform() {
return self.top_left.into_value();
}
let mut dict = Dict::new();
let mut handle = |key: &str, component: T| {
let value = component.into_value();
if value != Value::None {
dict.insert(key.into(), value);
}
};
handle("top-left", self.top_left);
handle("top-right", self.top_right);
handle("bottom-right", self.bottom_right);
handle("bottom-left", self.bottom_left);
Value::Dict(dict)
}
}
impl<T> FromValue for Corners<Option<T>>
where
T: FromValue + Clone,
{
fn from_value(mut value: Value) -> StrResult<Self> {
let keys = [
"top-left",
"top-right",
"bottom-right",
"bottom-left",
"left",
"top",
"right",
"bottom",
"rest",
];
if let Value::Dict(dict) = &mut value {
if dict.iter().any(|(key, _)| keys.contains(&key.as_str())) {
let mut take = |key| dict.take(key).ok().map(T::from_value).transpose();
let rest = take("rest")?;
let left = take("left")?.or_else(|| rest.clone());
let top = take("top")?.or_else(|| rest.clone());
let right = take("right")?.or_else(|| rest.clone());
let bottom = take("bottom")?.or_else(|| rest.clone());
let corners = Corners {
top_left: take("top-left")?
.or_else(|| top.clone())
.or_else(|| left.clone()),
top_right: take("top-right")?
.or_else(|| top.clone())
.or_else(|| right.clone()),
bottom_right: take("bottom-right")?
.or_else(|| bottom.clone())
.or_else(|| right.clone()),
bottom_left: take("bottom-left")?
.or_else(|| bottom.clone())
.or_else(|| left.clone()),
};
dict.finish(&keys)?;
return Ok(corners);
}
}
if T::castable(&value) {
Ok(Self::splat(Some(T::from_value(value)?)))
} else {
Err(Self::error(&value))
}
}
}
impl<T: Resolve> Resolve for Corners<T> {
type Output = Corners<T::Output>;
fn resolve(self, styles: StyleChain) -> Self::Output {
self.map(|v| v.resolve(styles))
}
}
impl<T: Fold> Fold for Corners<Option<T>> {
type Output = Corners<T::Output>;
fn fold(self, outer: Self::Output) -> Self::Output {
self.zip(outer).map(|(inner, outer)| match inner {
Some(value) => value.fold(outer),
None => outer,
})
}
}
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