| Value | Meaning |
|---|---|
| ALWAYS0 | The scrollbar is always visible. The view size is independent of the content. |
| AUTOMATIC1 | The scrollbar will appear and disappear as necessary. For example, when all of a gtk.TreeView can not be seen. |
| NEVER2 | The scrollbar should never appear. In this mode the content determines the size. |
| EXTERNAL3 | Don't show a scrollbar, but don't force the size to follow the content. This can be used e.g. to make multiple scrolled windows share a scrollbar. Since: 3.16 |
Determines how the size should be computed to achieve the one of the visibility mode for the scrollbars.