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import { AnimatedObject } from '@react-spring/animated'
import { Lookup, OneOrMore } from '@react-spring/types'
import {
is,
each,
toArray,
eachProp,
FluidValue,
FluidEvent,
getFluidValue,
callFluidObservers,
hasFluidValue,
addFluidObserver,
removeFluidObserver,
} from '@react-spring/shared'
/** The transform-functions
* (https://developer.mozilla.org/fr/docs/Web/CSS/transform-function)
* that you can pass as keys to your animated component style and that will be
* animated. Perspective has been left out as it would conflict with the
* non-transform perspective style.
*/
const domTransforms = /^(matrix|translate|scale|rotate|skew)/
// These keys have "px" units by default
const pxTransforms = /^(translate)/
// These keys have "deg" units by default
const degTransforms = /^(rotate|skew)/
type Value = number | string
/** Add a unit to the value when the value is unit-less (eg: a number) */
const addUnit = (value: Value, unit: string): string | 0 =>
is.num(value) && value !== 0 ? value + unit : value
/**
* Checks if the input value matches the identity value.
*
* isValueIdentity(0, 0) // => true
* isValueIdentity('0px', 0) // => true
* isValueIdentity([0, '0px', 0], 0) // => true
*/
const isValueIdentity = (value: OneOrMore<Value>, id: number): boolean =>
is.arr(value)
? value.every(v => isValueIdentity(v, id))
: is.num(value)
? value === id
: parseFloat(value) === id
type Inputs = ReadonlyArray<Value | FluidValue<Value>>[]
type Transforms = ((value: any) => [string, boolean])[]
/**
* This AnimatedStyle will simplify animated components transforms by
* interpolating all transform function passed as keys in the style object
* including shortcuts such as x, y and z for translateX/Y/Z
*/
export class AnimatedStyle extends AnimatedObject {
constructor({ x, y, z, ...style }: Lookup) {
/**
* An array of arrays that contains the values (static or fluid)
* used by each transform function.
*/
const inputs: Inputs = []
/**
* An array of functions that take a list of values (static or fluid)
* and returns (1) a CSS transform string and (2) a boolean that's true
* when the transform has no effect (eg: an identity transform).
*/
const transforms: Transforms = []
// Combine x/y/z into translate3d
if (x || y || z) {
inputs.push([x || 0, y || 0, z || 0])
transforms.push((xyz: Value[]) => [
`translate3d(${xyz.map(v => addUnit(v, 'px')).join(',')})`, // prettier-ignore
isValueIdentity(xyz, 0),
])
}
// Pluck any other transform-related props
eachProp(style, (value, key) => {
if (key === 'transform') {
inputs.push([value || ''])
transforms.push((transform: string) => [transform, transform === ''])
} else if (domTransforms.test(key)) {
delete style[key]
if (is.und(value)) return
const unit = pxTransforms.test(key)
? 'px'
: degTransforms.test(key)
? 'deg'
: ''
inputs.push(toArray(value))
transforms.push(
key === 'rotate3d'
? ([x, y, z, deg]: [number, number, number, Value]) => [
`rotate3d(${x},${y},${z},${addUnit(deg, unit)})`,
isValueIdentity(deg, 0),
]
: (input: Value[]) => [
`${key}(${input.map(v => addUnit(v, unit)).join(',')})`,
isValueIdentity(input, key.startsWith('scale') ? 1 : 0),
]
)
}
})
if (inputs.length) {
style.transform = new FluidTransform(inputs, transforms)
}
super(style)
}
}
/** @internal */
class FluidTransform extends FluidValue<string> {
protected _value: string | null = null
constructor(
readonly inputs: Inputs,
readonly transforms: Transforms
) {
super()
}
get() {
return this._value || (this._value = this._get())
}
protected _get() {
let transform = ''
let identity = true
each(this.inputs, (input, i) => {
const arg1 = getFluidValue(input[0])
const [t, id] = this.transforms[i](
is.arr(arg1) ? arg1 : input.map(getFluidValue)
)
transform += ' ' + t
identity = identity && id
})
return identity ? 'none' : transform
}
// Start observing our inputs once we have an observer.
protected observerAdded(count: number) {
if (count == 1)
each(this.inputs, input =>
each(
input,
value => hasFluidValue(value) && addFluidObserver(value, this)
)
)
}
// Stop observing our inputs once we have no observers.
protected observerRemoved(count: number) {
if (count == 0)
each(this.inputs, input =>
each(
input,
value => hasFluidValue(value) && removeFluidObserver(value, this)
)
)
}
eventObserved(event: FluidEvent) {
if (event.type == 'change') {
this._value = null
}
callFluidObservers(this, event)
}
}
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