Function updateZ

src/chart/custom/CustomView.ts:583–606

(
    el: Element,
    elOption: CustomElementOption,
    seriesModel: CustomSeriesModel
)

}

function updateZ(
    el: Element,
    elOption: CustomElementOption,
    seriesModel: CustomSeriesModel
): void {
    // Group not support textContent and not support z yet.
    if (el.isGroup) {
        return;
    }

    const elDisplayable = el as Displayable;
    const currentZ = seriesModel.currentZ;
    const currentZLevel = seriesModel.currentZLevel;
    // Always erase.
    elDisplayable.z = currentZ;
    elDisplayable.zlevel = currentZLevel;
    // z2 must not be null/undefined, otherwise sort error may occur.
    const optZ2 = (elOption as CustomDisplayableOption).z2;
    optZ2 != null && (elDisplayable.z2 = optZ2 || 0);

    for (let i = 0; i < STATES.length; i++) {
        updateZForEachState(elDisplayable, elOption, STATES[i]);
    }
}

function updateZForEachState(
    elDisplayable: Displayable,