BoxPanel
@Composable
A JPanel under a BoxLayout: the children are laid out one after another along a single axis, in declaration order.
A BoxLayout puts no space between children on its own. Declare gaps as content: RigidArea and Strut for a fixed gap, Glue for empty space that takes the largest share of what is left over.
Parameters
modifier
the SwingModifier applied to the panel
axis
the axis along which children are arranged (a BoxAxis BoxLayout value); the default Y_AXIS stacks them top to bottom
content
the composable content of the panel; empty by default