Appearance of the top bars.
If set to
ADW_TOOLBAR_FLAT, top 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 top of the page is
uniform. Additionally, windows with sidebars should always use this style.
Undershoot shadow is only present if a top bar is actually present and
visible. It is also never present if
AdwToolbarView:extend-content-to-top-edge is set to
If set to
ADW_TOOLBAR_RAISED, top bars have an opaque background and a
persistent shadow, this is suitable for content such as
where some elements are directly adjacent to the top 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.