Appearance of the bottom bars.
If set to
ADW_TOOLBAR_FLAT, bottom bars are flat and scrolling content
has a subtle undershoot shadow when touching them, same as the
style class. This works well for simple content, e.g.
AdwPreferencesPage, where the background at the bottom of the page is
uniform. Additionally, windows with sidebars should always use this style.
Undershoot shadow is only present if a bottom bar is actually present and
visible. It is also never present if
AdwToolbarView:extend-content-to-bottom-edge is set to
If set to
ADW_TOOLBAR_RAISED, bottom bars have an opaque background and a
persistent shadow, this is suitable for content such as
where some elements are directly adjacent to the bottom bars, or
AdwTabView, where each page can have a different background.
ADW_TOOLBAR_RAISED_BORDER is similar to
ADW_TOOLBAR_RAISED, but the
shadow is replaced with a more subtle border. This can be useful for
applications like image viewers.