code: function packEventData(el, seriesModel, itemNode) {
      el.eventData = {
          componentType: 'series',
          componentSubType: 'treemap',
          componentIndex: seriesModel.componentIndex,
          seriesIndex: seriesModel.componentIndex,
          seriesName: seriesModel.name,
          seriesType: 'treemap',
          selfType: 'breadcrumb', // Distinguish with click event on treemap node.
          nodeData: {
              dataIndex: itemNode && itemNode.dataIndex,
              name: itemNode && itemNode.name
          },
          treePathInfo: itemNode && wrapTreePathInfo(itemNode, seriesModel)
      };
  }
docs: Package custom mouse event.