Events on image preview open/close.

[kieste]

This function solves the problem (这个功能解决的问题)

The app cannot react to the image preview.

For example I would like to display custom controls in front of the current image preview.

Expected API (期望的 API)

<n-image
    width="100"
    src="https://07akioni.oss-cn-beijing.aliyuncs.com/07akioni.jpeg"
    on-preview-open="handleImagePreviewOpen"
    on-preview-close="handleImagePreviewClose"
/>

When moving to the previous/next image in an image group, the close-handler of the current image is called and the open-handler of the previous/next image.

[jahnli]

on-preview-prev on-preview-next