Function updateZForEachState

src/chart/custom/CustomView.ts:608–625

(
    elDisplayable: Displayable,
    elOption: CustomDisplayableOption,
    state: DisplayState
)

}

function updateZForEachState(
    elDisplayable: Displayable,
    elOption: CustomDisplayableOption,
    state: DisplayState
): void {
    const isNormal = state === NORMAL;
    const elStateOpt = isNormal ? elOption : retrieveStateOption(
        elOption as CustomElementOption,
        state as DisplayStateNonNormal
    );
    const optZ2 = elStateOpt ? elStateOpt.z2 : null;
    let stateObj;
    if (optZ2 != null) {
        // Do not `ensureState` until required.
        stateObj = isNormal ? elDisplayable : elDisplayable.ensureState(state);
        stateObj.z2 = optZ2 || 0;
    }
}

function makeRenderItem(
    customSeries: CustomSeriesModel,