Hi Jimmy Huang,
Currently, there is no direct option to know the zooming or panning end in the
SfMaps widget. We have considered your request as a feature and the status can be tracked from the feedback portal link.
Feedback: https://www.syncfusion.com/feedback/31785/need-onzoompanstart-and-onzoompanend-callback-support-in-sfmaps
We will prioritize the features every release based on the demands and priority. So, this feature will be available in any of our releases. If you have any more specification/suggestions to the feature request, you can add it as a comment in the portal.
Disclaimer: The date for this feature implementation is tentative and not a commitment on our parts.
Please let us know if you need any further assistance in this.
Regards,
Praveen G.