Method _dragHandle

src/component/visualMap/ContinuousView.ts:388–428

(
        handleIndex: 0 | 1 | 'all',
        isEnd?: boolean,
        // dx is event from ondragend if isEnd is true. It's not used
        dx?: number | ElementEvent,
        dy?: number
    )

    }

    private _dragHandle(
        handleIndex: 0 | 1 | 'all',
        isEnd?: boolean,
        // dx is event from ondragend if isEnd is true. It's not used
        dx?: number | ElementEvent,
        dy?: number
    ) {
        if (!this._useHandle) {
            return;
        }

        this._dragging = !isEnd;

        if (!isEnd) {
            // Transform dx, dy to bar coordination.
            const vertex = this._applyTransform([dx as number, dy], this._shapes.mainGroup, true) as number[];
            this._updateInterval(handleIndex, vertex[1]);

            this._hideIndicator();
            // Considering realtime, update view should be executed
            // before dispatch action.
            this._updateView();
        }

        // dragEnd do not dispatch action when realtime.
        if (isEnd === !this.visualMapModel.get('realtime')) { // jshint ignore:line
            this.api.dispatchAction({
                type: 'selectDataRange',
                from: this.uid,
                visualMapId: this.visualMapModel.id,
                selected: this._dataInterval.slice()
            });
        }

        if (isEnd) {
            !this._hovering && this._clearHoverLinkToSeries();
        }
        else if (useHoverLinkOnHandle(this.visualMapModel)) {
            this._doHoverLinkToSeries(this._handleEnds[handleIndex as 0 | 1], false);
        }
    }

    private _resetInterval() {
        const visualMapModel = this.visualMapModel;