Method _showSeriesItemTooltip

src/component/tooltip/TooltipView.ts:659–738

(
        e: TryShowParams,
        dispatcher: ECElement,
        dispatchAction: ExtensionAPI['dispatchAction']
    )

    }

    private _showSeriesItemTooltip(
        e: TryShowParams,
        dispatcher: ECElement,
        dispatchAction: ExtensionAPI['dispatchAction']
    ) {
        const ecModel = this._ecModel;
        const ecData = getECData(dispatcher);
        // Use dataModel in element if possible
        // Used when mouseover on a element like markPoint or edge
        // In which case, the data is not main data in series.
        const seriesIndex = ecData.seriesIndex;
        const seriesModel = ecModel.getSeriesByIndex(seriesIndex);

        // For example, graph link.
        const dataModel = ecData.dataModel || seriesModel;
        const dataIndex = ecData.dataIndex;
        const dataType = ecData.dataType;
        const data = dataModel.getData(dataType);
        const renderMode = this._renderMode;

        const positionDefault = e.positionDefault;
        const tooltipModel = buildTooltipModel(
            [
                data.getItemModel<TooltipableOption>(dataIndex),
                dataModel,
                seriesModel && (seriesModel.coordinateSystem || {}).model as Model<TooltipableOption>
            ],
            this._tooltipModel,
            positionDefault ? { position: positionDefault } : null
        );

        const tooltipTrigger = tooltipModel.get('trigger');
        if (tooltipTrigger != null && tooltipTrigger !== 'item') {
            return;
        }

        const params = dataModel.getDataParams(dataIndex, dataType);
        const markupStyleCreator = new TooltipMarkupStyleCreator();
        // Pre-create marker style for makers. Users can assemble richText
        // text in `formatter` callback and use those markers style.
        params.marker = markupStyleCreator.makeTooltipMarker(
            'item', convertToColorString(params.color), renderMode
        );

        const seriesTooltipResult = normalizeTooltipFormatResult(
            dataModel.formatTooltip(dataIndex, false, dataType)
        );
        const orderMode = tooltipModel.get('order');
        const valueFormatter = tooltipModel.get('valueFormatter');
        const frag = seriesTooltipResult.frag;
        const markupText = frag ? buildTooltipMarkup(
                valueFormatter ? extend({ valueFormatter }, frag) : frag,
                markupStyleCreator,
                renderMode,
                orderMode,
                ecModel.get('useUTC'),
                tooltipModel.get('textStyle')
            )