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//! The animatable slots an entrance or a keyframe stop may name (width,
//! height, bg, radius, opacity) as one value.
//!
//! You rarely build a [`Slots`] directly: [`crate::enter::Enter`] (where
//! a node starts on first sight) and [`crate::keyframes::Keyframe`] (a
//! stop in a cycle) are this plus one field each, carry the same builders,
//! and deref to it, so `enter.bg` reads the slot.
//!
//! ```rust
//! use kui_core::{Color, Enter};
//!
//! let enter = Enter::from(-40.0, 0.0).bg(Color::WHITE).opacity(0.0);
//! assert_eq!(enter.opacity, Some(0.0));
//! assert_eq!(enter.bg, Some(Color::WHITE));
//! assert!(enter.width.is_none());
//! ```
use crate::anim::Slot;
use crate::color::Color;
use crate::spec::Sizing;
use crate::value::Value;
/// The slots, each optional: one left out is not part of the entrance or
/// the stop, and keeps whatever the node itself declares.
#[derive(Clone, Copy, Debug, Default, PartialEq)]
pub struct Slots {
/// Only the amount animates, in the form the node's own `width`
/// declares (a `fit` width never moves).
pub width: Option<Sizing>,
pub height: Option<Sizing>,
pub bg: Option<Color>,
/// All four corners.
pub radius: Option<f32>,
/// Group opacity, 0..=1.
pub opacity: Option<f32>,
}
impl Slots {
pub fn width(mut self, width: Sizing) -> Self {
self.width = Some(width);
self
}
pub fn height(mut self, height: Sizing) -> Self {
self.height = Some(height);
self
}
pub fn bg(mut self, bg: Color) -> Self {
self.bg = Some(bg);
self
}
pub fn radius(mut self, radius: f32) -> Self {
self.radius = Some(radius);
self
}
pub fn opacity(mut self, opacity: f32) -> Self {
self.opacity = Some(opacity.clamp(0.0, 1.0));
self
}
/// Reads one field of a stop or an entrance from plain data, in the
/// form the prop itself takes (sizings as a number, `"grow"`, `"50%"`,
/// `{grow}` / `{percent}`; colours as `0xRRGGBBAA` or `"#hex"`).
/// `Ok(false)` when `name` is none of the five, so the caller can read
/// its own fields after. Every binding funnels through here, so the
/// shape is the same in JSX, Lua and C. With `refs`, a `$name` in a
/// colour or length slot resolves through it, and one that misses
/// leaves the slot unnamed, remembered on the refs.
pub(crate) fn parse_field(
&mut self,
name: &str,
v: &Value,
refs: Option<&mut crate::tokens::NameRefs<'_>>,
) -> Result<bool, String> {
let num = |what: &str| {
v.as_float()
.map(|n| n as f32)
.ok_or_else(|| format!("{what} must be a number"))
};
if let Some(refs) = refs {
let hit = match name {
"width" => refs
.length_ref(v)
.map(|px| self.width = px.map(Sizing::Fixed)),
"height" => refs
.length_ref(v)
.map(|px| self.height = px.map(Sizing::Fixed)),
"bg" => refs.color_ref(v).map(|c| self.bg = c),
"radius" => refs.length_ref(v).map(|r| self.radius = r),
_ => None,
};
if hit.is_some() {
return Ok(true);
}
}
match name {
// An expression the full table refused leaves the slot
// unset, as a prop is left undeclared.
"width" => self.width = kept(sizing_value(v))?,
"height" => self.height = kept(sizing_value(v))?,
"bg" => self.bg = Some(color_value(v)?),
"radius" => self.radius = Some(num("radius")?),
"opacity" => self.opacity = Some(num("opacity")?.clamp(0.0, 1.0)),
_ => return Ok(false),
}
Ok(true)
}
/// The slot's value as the four lanes a tween carries, or `None` when
/// the slot is not named — or is a sizing with no amount to animate.
/// The slots a transition tweens that no entrance or stop can name
/// (border, position, shadow) answer `None` too. Inlined: it is asked
/// once per slot per transitioning node per frame.
#[inline]
pub(crate) fn lanes(&self, slot: Slot) -> Option<[f32; 4]> {
match slot {
Slot::Width => self.width.and_then(Sizing::amount).map(one),
Slot::Height => self.height.and_then(Sizing::amount).map(one),
Slot::Bg => self.bg.map(Color::lanes),
Slot::Radius => self.radius.map(|r| [r; 4]),
Slot::Opacity => self.opacity.map(one),
Slot::Border | Slot::Pos | Slot::Shadow | Slot::ShadowColor => None,
}
}
}
/// A scalar in a tween's four lanes: the value, then nothing.
#[inline]
pub(crate) fn one(v: f32) -> [f32; 4] {
[v, 0.0, 0.0, 0.0]
}
/// The five delegating builders on a type with a `slots: Slots` field, so
/// `Enter::from(..).bg(..)` and `Keyframe::default().at(..).bg(..)` read
/// the same and are written once.
macro_rules! slot_builders {
($ty:ty) => {
impl $ty {
/// A [`crate::spec::Sizing`], or a number of px, as on a spec.
#[inline]
pub fn width(mut self, width: impl Into<crate::spec::Sizing>) -> Self {
self.slots = self.slots.width(width.into());
self
}
/// A [`crate::spec::Sizing`], or a number of px, as on a spec.
#[inline]
pub fn height(mut self, height: impl Into<crate::spec::Sizing>) -> Self {
self.slots = self.slots.height(height.into());
self
}
/// `width(Sizing::GROW)`, as on a spec.
#[inline]
pub fn grow_width(self) -> Self {
self.width(crate::spec::Sizing::GROW)
}
/// `height(Sizing::GROW)`, as on a spec.
#[inline]
pub fn grow_height(self) -> Self {
self.height(crate::spec::Sizing::GROW)
}
pub fn bg(mut self, bg: crate::color::Color) -> Self {
self.slots = self.slots.bg(bg);
self
}
pub fn radius(mut self, radius: f32) -> Self {
self.slots = self.slots.radius(radius);
self
}
pub fn opacity(mut self, opacity: f32) -> Self {
self.slots = self.slots.opacity(opacity);
self
}
}
impl std::ops::Deref for $ty {
type Target = crate::slots::Slots;
fn deref(&self) -> &crate::slots::Slots {
&self.slots
}
}
impl std::ops::DerefMut for $ty {
fn deref_mut(&mut self) -> &mut crate::slots::Slots {
&mut self.slots
}
}
};
}
pub(crate) use slot_builders;
/// `Some` of what parsed, `None` for a size expression the full table
/// refused ([`crate::calc::is_full`]), the error otherwise.
fn kept<T>(r: Result<T, String>) -> Result<Option<T>, String> {
match r {
Ok(v) => Ok(Some(v)),
Err(e) if crate::calc::is_full(&e) => Ok(None),
Err(e) => Err(e),
}
}
/// A sizing from plain data, in the forms the prop takes.
pub(crate) fn sizing_value(v: &Value) -> Result<Sizing, String> {
match v {
Value::Int(_) | Value::Float(_) => Ok(Sizing::Fixed(v.as_float().unwrap_or(0.0) as f32)),
Value::Str(s) => crate::schema::sizing_str(s),
Value::Map(_) => {
if let Some(g) = v.get_float("grow") {
Ok(Sizing::Grow(g as f32))
} else if let Some(p) = v.get_float("percent") {
// JS's spelling, as `"50%"` and a size expression's
// `{ percent: 50 }` read it.
Ok(Sizing::Percent(p as f32 / 100.0))
} else if let Some(p) = v.get_float("pct") {
// The Lua spelling.
Ok(Sizing::Percent(p as f32 / 100.0))
} else {
// A size expression as data.
crate::calc::sizing_value(v).map_err(|e| {
format!("sizing object needs grow, percent or a size expression: {e}")
})
}
}
_ => Err("bad sizing (fit | grow | number | \"N%\" | a size expression)".into()),
}
}
/// A colour from plain data: `0xRRGGBBAA` or `"#hex"`.
pub(crate) fn color_value(v: &Value) -> Result<Color, String> {
match v {
Value::Int(n) => Ok(crate::schema::color_num(*n as u32)),
Value::Float(n) => Ok(crate::schema::color_num(*n as u32)),
Value::Str(s) => crate::schema::color_hex_str(s),
_ => Err("color must be a 0xRRGGBBAA number or \"#hex\" string".into()),
}
}