[ruby-talk:444512] Blog: Glimmer DSL for LibUI Custom Control Component Slots

Glimmer DSL for LibUI (Prerequisite-Free Ruby Desktop Development
Cross-Platform Native GUI Library) version 0.12.0 ships with an exciting
new feature called Custom Control Component Slots!!! Component Slots are
containers that could accept content in different parts of a Custom Control
component (e.g. an address_form Custom Control can have a header slot and a
footer slot to display extra information about the address being entered,
which consumers could fill in with any GUI controls). A new example has
been implemented to demonstrate this feature: Class-Based Custom Control