@visactor/vchart/esm/interaction/triggers/element-highlight.js

charts lib based @visactor/VGrammar

import { isString } from "@visactor/vutils";

import { STATE_VALUE_ENUM } from "../../compile/mark/interface";

import { BaseTrigger } from "./base";

import { Factory } from "../../core/factory";

const defaultOptions = {
    highlightState: STATE_VALUE_ENUM.STATE_HIGHLIGHT,
    blurState: STATE_VALUE_ENUM.STATE_BLUR,
    trigger: "pointerover",
    triggerOff: "pointerout"
};

export class ElementHighlight extends BaseTrigger {
    constructor(options) {
        super(options), this.type = "element-highlight", this.resetAll = e => {
            const {highlightState: highlightState, blurState: blurState, interaction: interaction} = this.options;
            this._lastGraphic && (interaction.clearAllStatesOfTrigger(this, highlightState, blurState), 
            this.dispatchEvent("reset", Object.assign({
                graphics: [ this._lastGraphic ],
                options: this.options
            }, e)), this._lastGraphic = null, interaction.setStatedGraphics(this, []));
        }, this.handleStart = e => {
            this.start(e.item, e);
        }, this.handleReset = e => {
            const {interaction: interaction} = this.options, statedGraphics = interaction.getStatedGraphics(this);
            if (!statedGraphics || !statedGraphics.length) return;
            const markGraphic = e.item, hasActiveElement = markGraphic && this._markSet.getMarkInId(markGraphic.context.markId);
            (this._resetType.includes("view") && !hasActiveElement || this._resetType.includes("self") && hasActiveElement) && this.resetAll(e);
        }, this.options = Object.assign({}, defaultOptions, options), this.updateMarkIdByState([ this.options.highlightState, this.options.blurState ]);
    }
    getStartState() {
        return this.options.highlightState;
    }
    getResetState() {
        return this.options.blurState;
    }
    getEvents() {
        const triggerOff = this.options.triggerOff, events = [ {
            type: this.options.trigger,
            handler: this.handleStart
        } ];
        let eventName = triggerOff;
        return isString(triggerOff) && triggerOff.includes("view:") ? (eventName = triggerOff.replace("view:", ""), 
        this._resetType = "view") : this._resetType = "self", events.push({
            type: eventName,
            handler: this.handleReset
        }), events;
    }
    start(markGraphic, e) {
        if (markGraphic && this._markSet.getMarkInId(markGraphic.context.markId)) {
            const {highlightState: highlightState, blurState: blurState, interaction: interaction} = this.options;
            if (this._lastGraphic === markGraphic) return;
            const newStatedGraphics = interaction.updateStates(this, [ markGraphic ], interaction.getStatedGraphics(this), highlightState, blurState);
            interaction.setStatedGraphics(this, newStatedGraphics), this._lastGraphic = markGraphic, 
            this.dispatchEvent("start", Object.assign({
                graphics: newStatedGraphics,
                options: this.options
            }, e));
        } else this._lastGraphic && "view" === this._resetType && this.resetAll(e);
    }
    reset(markGraphic, e) {
        markGraphic ? this._markSet.getMarkInId(markGraphic.context.markId) && markGraphic.removeState([ this.options.highlightState, this.options.blurState ]) : this.resetAll(e);
    }
}

ElementHighlight.type = "element-highlight", ElementHighlight.defaultOptions = defaultOptions;

export const registerElementHighlight = () => {
    Factory.registerInteractionTrigger(ElementHighlight.type, ElementHighlight);
};
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