@antv/g2/esm/transform/maybeTooltip.js

the Grammar of Graphics in Javascript

import { deepMix } from '@antv/util';
import { isUnset } from '../utils/helper';
/**
 * Infer tooltip channel from specified channel.
 */
export const MaybeTooltip = (options) => {
    const { channel } = options;
    return (I, mark) => {
        const { encode, tooltip } = mark;
        if (isUnset(tooltip))
            return [I, mark];
        const { items = [] } = tooltip;
        if (!items || items.length > 0)
            return [I, mark];
        const channels = Array.isArray(channel) ? channel : [channel];
        const newItems = channels.flatMap((channel) => Object.keys(encode)
            .filter((key) => key.startsWith(channel))
            .map((key) => {
            const { field, value, inferred = false, aggregate } = encode[key];
            if (inferred)
                return null;
            // Do not show inferred column.
            if (aggregate && value)
                return { channel: key };
            if (field)
                return { field };
            if (value)
                return { channel: key };
            return null;
        })
            .filter((d) => d !== null));
        return [I, deepMix({}, mark, { tooltip: { items: newItems } })];
    };
};
MaybeTooltip.props = {};
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