src This add(Elem button)

Convenience to add a button to buttons.

src Elem[] buttons := Elem[,]

Buttons in this group.

src Bool enabled := true

Set enabled state for this button group.

src Bool inheritEnabled := true

If true, child buttons will inherit the enabled state of this ButtonGroup. If false buttons can be enabled or disabled independent of group.

src Void onBeforeSelect(|ButtonGroup,Int->Bool| f)

Callback before a selection changes. Return true to select the new button (default), or false to keep the currently selected button.

src Void onSelect(|This| f)

Callback when selection in group has changed.

src Int? selIndex := null

Index of selected button, or null if none selected.