Function findEffectedDataZooms

src/component/dataZoom/helper.ts:103–163

(ecModel: GlobalModel, payload: Payload)

 * This function finds all linked dataZoomModels start from the given payload.
 */
export function findEffectedDataZooms(ecModel: GlobalModel, payload: Payload): DataZoomModel[] {

    // Key: `DataZoomAxisDimension`
    const axisRecords = createHashMap<boolean[], DataZoomAxisDimension>();
    const effectedModels: DataZoomModel[] = [];
    // Key: uid of dataZoomModel
    const effectedModelMap = createHashMap<boolean>();

    // Find the dataZooms specified by payload.
    ecModel.eachComponent(
        { mainType: 'dataZoom', query: payload },
        function (dataZoomModel: DataZoomModel) {
            if (!effectedModelMap.get(dataZoomModel.uid)) {
                addToEffected(dataZoomModel);
            }
        }
    );

    // Start from the given dataZoomModels, travel the graph to find
    // all of the linked dataZoom models.
    let foundNewLink;
    do {
        foundNewLink = false;
        ecModel.eachComponent('dataZoom', processSingle);
    }
    while (foundNewLink);

    function processSingle(dataZoomModel: DataZoomModel): void {
        if (!effectedModelMap.get(dataZoomModel.uid) && isLinked(dataZoomModel)) {
            addToEffected(dataZoomModel);
            foundNewLink = true;
        }
    }

    function addToEffected(dataZoom: DataZoomModel): void {
        effectedModelMap.set(dataZoom.uid, true);
        effectedModels.push(dataZoom);
        markAxisControlled(dataZoom);
    }

    function isLinked(dataZoomModel: DataZoomModel): boolean {
        let isLink = false;
        dataZoomModel.eachTargetAxis(function (axisDim, axisIndex) {
            const axisIdxArr = axisRecords.get(axisDim);
            if (axisIdxArr && axisIdxArr[axisIndex]) {
                isLink = true;
            }
        });
        return isLink;
    }

    function markAxisControlled(dataZoomModel: DataZoomModel) {
        dataZoomModel.eachTargetAxis(function (axisDim, axisIndex) {
            (
                axisRecords.get(axisDim) || axisRecords.set(axisDim, [])
            )[axisIndex] = true;
        });
    }