buttonSize property
Diameter of standalone bar buttons (including the automatic back button and GlassBarItemBackground.separate, GlassBarItemBackground.own, and GlassBarItemBackground.none items), in logical pixels.
Defaults to GlassNavPinnedMetrics.backDiameter (44.0). Shared
multi-item capsules (GlassBarItemBackground.shared) use
buttonSize + (GlassNavPinnedMetrics.slot - GlassNavPinnedMetrics.backDiameter)
(buttonSize + 2.0), preserving the 46 / 44 ratio.
Ignored in iPhone Duo's vertical bar strip, where controls use GlassVerticalBarMetrics.controlExtent.
Implementation
final double? buttonSize;