buttonSize property
Diameter of standalone bar buttons (the automatic back button and non-shared items) on a GlassAppBar.pinned bar, in logical pixels.
Defaults to 44.0 when null. Shared multi-item capsules scale
proportionally (buttonSize + 2.0), and custom items
(GlassBarItem.custom) are constrained to this height in a horizontal
bar. When buttonSize exceeds toolbarHeight, the toolbar row and
preferredSize expand to accommodate it.
Implementation
final double? buttonSize;