import React , { FC , useCallback , useEffect , useMemo , useRef , useState } from 'react' ; import classNames from 'classnames' ; import TooltipTrigger from 'react-popper-tooltip' ; import { EuiFlexGroup , EuiFlexItem } from '@elastic/eui' ; import { TooltipValueFormatter } from '@elastic/charts' ; import './_index.scss' ; import { ChildrenArg , TooltipTriggerProps } from 'react-popper-tooltip/dist/types' ; import { ChartTooltipService , ChartTooltipValue , TooltipData } from './chart_tooltip_service' ; const renderHeader = ( headerData ? , formatter ? ) => { if ( ! headerData ) { return null ; } return formatter ? formatter ( headerData ) : headerData . label ; } ; /**
 * Pure component for rendering the tooltip content with a custom layout across the ML plugin.
 */ export const FormattedTooltip = ( { tooltipData } ) => { return ( < div className = "mlChartTooltip" > { tooltipData . length > 0 && tooltipData [ 0 ] . skipHeader === undefined && ( < div className = "mlChartTooltip__header" > { renderHeader ( tooltipData [ 0 ] ) } < /div>)} { tooltipData . length > 1 && ( < div className = "mlChartTooltip__list" > { tooltipData . slice ( 1 ) . map ( ( { label , value , color , isHighlighted , seriesIdentifier , valueAccessor } ) => { const classes = classNames ( 'mlChartTooltip__item' , { echTooltip__rowHighlighted : isHighlighted , } ) ; const renderValue = Array . isArray ( value ) ? value . map ( ( v ) => < div key = { v } > { v } < /div>) : value ; return ( < div key = { `${ seriesIdentifier . key }__${ valueAccessor }` } className = { classes } style = { { borderLeftColor : color , } } > < EuiFlexGroup > < EuiFlexItem className = "eui-textBreakWord mlChartTooltip__label" grow = { false } > { label } < /EuiFlexItem> < EuiFlexItem className = "eui-textBreakAll mlChartTooltip__value" > { renderValue } < /EuiFlexItem> < /EuiFlexGroup> < /div>); } ) } < /div>)} < /div>); } ; /**
 * Tooltip component bundled with the  ChartTooltipService const Tooltip = React . memo ( ( { service } ) => { const [ tooltipData , setData ] = useState < TooltipData > ( [ ] ) ; const refCallback = useRef < ChildrenArg [ 'triggerRef' ] > ( ) ; useEffect ( ( ) => { const subscription = service . tooltipState$ . subscribe ( ( tooltipState ) => { if ( refCallback . current && typeof refCallback . current === 'function' ) { refCallback . current ( tooltipState . target ) ; } setData ( tooltipState . tooltipData ) ; } ) ; return ( ) => { subscription . unsubscribe ( ) ; } ; } , [ ] ) ; const triggerCallback = useCallback ( ( ( { triggerRef } ) => { refCallback . current = triggerRef ; return null ; } ) as TooltipTriggerProps [ 'children' ] , [ ] ) ; const tooltipCallback = useCallback ( ( ( { tooltipRef , getTooltipProps } ) => { return ( < div { ... getTooltipProps ( { ref : tooltipRef , } ) } > < FormattedTooltip tooltipData = { tooltipData } / > < /div>); } ) as TooltipTriggerProps [ 'tooltip' ] , [ tooltipData ] ) ; const isTooltipShown = tooltipData . length > 0 ; return ( < TooltipTrigger modifiers = { { preventOverflow : { boundariesElement : 'window' , } , } } placement = "right-start" trigger = "none" tooltipShown = { isTooltipShown } tooltip = { tooltipCallback } > { triggerCallback } < /TooltipTrigger>); } ) ; interface MlTooltipComponentProps { children : ( tooltipService : ChartTooltipService ) => React . ReactElement ; } export const MlTooltipComponent = ( { children } ) => { const service = useMemo ( ( ) => new ChartTooltipService ( ) , [ ] ) ; return ( < > < Tooltip service = { service } / > { children ( service ) } < />); } ;