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Circles.tsx
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Circles.tsx
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import React, { createElement, useMemo, MouseEvent } from 'react'
import { useTransition, to, SpringValue } from 'react-spring'
import { useMotionConfig } from '@nivo/core'
import { useTooltip } from '@nivo/tooltip'
import { ComputedDatum, CircleComponent, MouseHandlers, CirclePackingCommonProps } from './types'
/**
* A negative radius value is invalid for an SVG circle,
* this custom interpolation makes sure it's either
* positive or zero.
*/
export const interpolateRadius = (radiusValue: SpringValue<number>) =>
to([radiusValue], radius => Math.max(0, radius))
type CirclesProps<RawDatum> = {
nodes: ComputedDatum<RawDatum>[]
component: CircleComponent<RawDatum>
isInteractive: CirclePackingCommonProps<RawDatum>['isInteractive']
tooltip: CirclePackingCommonProps<RawDatum>['tooltip']
} & MouseHandlers<RawDatum>
const getTransitionPhases = <RawDatum,>() => ({
enter: (node: ComputedDatum<RawDatum>) => ({
x: node.x,
y: node.y,
radius: 0,
color: node.color,
opacity: 0,
}),
update: (node: ComputedDatum<RawDatum>) => ({
x: node.x,
y: node.y,
radius: node.radius,
color: node.color,
opacity: 1,
}),
leave: (node: ComputedDatum<RawDatum>) => ({
x: node.x,
y: node.y,
radius: 0,
color: node.color,
opacity: 0,
}),
})
export const Circles = <RawDatum,>({
nodes,
component,
isInteractive,
onMouseEnter,
onMouseMove,
onMouseLeave,
onClick,
tooltip,
}: CirclesProps<RawDatum>) => {
const { showTooltipFromEvent, hideTooltip } = useTooltip()
const handleMouseEnter = useMemo(() => {
if (!isInteractive) return undefined
return (node: ComputedDatum<RawDatum>, event: MouseEvent) => {
showTooltipFromEvent(createElement(tooltip, node), event)
onMouseEnter?.(node, event)
}
}, [isInteractive, showTooltipFromEvent, tooltip, onMouseEnter])
const handleMouseMove = useMemo(() => {
if (!isInteractive) return undefined
return (node: ComputedDatum<RawDatum>, event: MouseEvent) => {
showTooltipFromEvent(createElement(tooltip, node), event)
onMouseMove?.(node, event)
}
}, [isInteractive, showTooltipFromEvent, tooltip, onMouseMove])
const handleMouseLeave = useMemo(() => {
if (!isInteractive) return undefined
return (node: ComputedDatum<RawDatum>, event: MouseEvent) => {
hideTooltip()
onMouseLeave?.(node, event)
}
}, [isInteractive, hideTooltip, onMouseLeave])
const handleClick = useMemo(() => {
if (!isInteractive) return undefined
return (node: ComputedDatum<RawDatum>, event: MouseEvent) => {
onClick?.(node, event)
}
}, [isInteractive, onClick])
const { animate, config: springConfig } = useMotionConfig()
const transitionPhases = useMemo(() => getTransitionPhases<RawDatum>(), [])
const transition = useTransition<
ComputedDatum<RawDatum>,
{
x: number
y: number
radius: number
color: string
opacity: number
}
>(nodes, {
key: node => node.id,
initial: transitionPhases.update,
from: transitionPhases.enter,
enter: transitionPhases.update,
update: transitionPhases.update,
leave: transitionPhases.leave,
config: springConfig,
immediate: !animate,
})
return (
<>
{transition((transitionProps, node) => {
return React.createElement(component, {
key: node.id,
node,
style: {
...transitionProps,
radius: interpolateRadius(transitionProps.radius),
},
onMouseEnter: handleMouseEnter,
onMouseMove: handleMouseMove,
onMouseLeave: handleMouseLeave,
onClick: handleClick,
})
})}
</g>
)
}