ViewStyle: view style of the Listview, including Thumbnails.

代码说明：

- ViewStyle: view style of the Listview, including Thumbnails. - ThumbOptions: general thumbnail options, like size, spacing, highlight color, etc. Special options are: + BorderOnFiles: when true it shows borders on all the files and folders, otherwise it shows borders only on image files. + CacheOptions: thumbnail cache and compression options. + Details: allows to show file and image properties below the thumbnail.-- ViewStyle: view style of the Listview, including Thumbnails. - ThumbOptions: general thumbnail options, like size, spacing, highlight color, etc. Special options are: + BorderOnFiles: when true it shows borders on all the files and folders, otherwise it shows borders only on image files. + CacheOptions: thumbnail cache and compression options. + Details: allows to show file and image properties below the thumbnail.