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|
use super::*;
/// Where to align something along an axis.
#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub enum Align {
/// Align at the left side.
Left,
/// Align in the horizontal middle.
Center,
/// Align at the right side.
Right,
/// Align at the top side.
Top,
/// Align in the vertical middle.
Horizon,
/// Align at the bottom side.
Bottom,
}
impl Align {
/// Top-left alignment.
pub const LEFT_TOP: Axes<Self> = Axes { x: Align::Left, y: Align::Top };
/// Center-horizon alignment.
pub const CENTER_HORIZON: Axes<Self> = Axes { x: Align::Center, y: Align::Horizon };
/// The axis this alignment belongs to.
pub const fn axis(self) -> Axis {
match self {
Self::Left | Self::Center | Self::Right => Axis::X,
Self::Top | Self::Horizon | Self::Bottom => Axis::Y,
}
}
/// The inverse alignment.
pub const fn inv(self) -> Self {
match self {
Self::Left => Self::Right,
Self::Center => Self::Center,
Self::Right => Self::Left,
Self::Top => Self::Bottom,
Self::Horizon => Self::Horizon,
Self::Bottom => Self::Top,
}
}
/// Returns the position of this alignment in a container with the given
/// extent.
pub fn position(self, extent: Abs) -> Abs {
match self {
Self::Left | Self::Top => Abs::zero(),
Self::Center | Self::Horizon => extent / 2.0,
Self::Right | Self::Bottom => extent,
}
}
}
impl From<Side> for Align {
fn from(side: Side) -> Self {
match side {
Side::Left => Self::Left,
Side::Top => Self::Top,
Side::Right => Self::Right,
Side::Bottom => Self::Bottom,
}
}
}
impl Debug for Align {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
f.pad(match self {
Self::Left => "left",
Self::Center => "center",
Self::Right => "right",
Self::Top => "top",
Self::Horizon => "horizon",
Self::Bottom => "bottom",
})
}
}
/// The generic alignment representation.
#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub enum GenAlign {
/// Align at the start side of the text direction.
Start,
/// Align at the end side of the text direction.
End,
/// Align at a specific alignment.
Specific(Align),
}
impl GenAlign {
/// The axis this alignment belongs to.
pub const fn axis(self) -> Axis {
match self {
Self::Start | Self::End => Axis::X,
Self::Specific(align) => align.axis(),
}
}
}
impl From<Align> for GenAlign {
fn from(align: Align) -> Self {
Self::Specific(align)
}
}
impl Debug for GenAlign {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
match self {
Self::Start => f.pad("start"),
Self::End => f.pad("end"),
Self::Specific(align) => align.fmt(f),
}
}
}
cast_from_value! {
GenAlign: "alignment",
}
cast_from_value! {
Axes<GenAlign>: "2d alignment",
}
cast_from_value! {
Axes<Option<GenAlign>>,
align: GenAlign => {
let mut aligns = Axes::default();
aligns.set(align.axis(), Some(align));
aligns
},
aligns: Axes<GenAlign> => aligns.map(Some),
}
cast_to_value! {
v: Axes<Option<GenAlign>> => match (v.x, v.y) {
(Some(x), Some(y)) => Axes::new(x, y).into(),
(Some(x), None) => x.into(),
(None, Some(y)) => y.into(),
(None, None) => Value::None,
}
}
impl From<Axes<GenAlign>> for Axes<Option<GenAlign>> {
fn from(axes: Axes<GenAlign>) -> Self {
axes.map(Some)
}
}
impl From<Axes<Align>> for Axes<Option<GenAlign>> {
fn from(axes: Axes<Align>) -> Self {
axes.map(GenAlign::Specific).into()
}
}
impl From<Align> for Axes<Option<GenAlign>> {
fn from(align: Align) -> Self {
let mut axes = Axes::splat(None);
axes.set(align.axis(), Some(align.into()));
axes
}
}
impl Resolve for GenAlign {
type Output = Align;
fn resolve(self, styles: StyleChain) -> Self::Output {
let dir = item!(dir)(styles);
match self {
Self::Start => dir.start().into(),
Self::End => dir.end().into(),
Self::Specific(align) => align,
}
}
}
impl Fold for GenAlign {
type Output = Self;
fn fold(self, _: Self::Output) -> Self::Output {
self
}
}
|
