Directive that has 2 states i.e. open and closed
Can be used to build Accordion, Collapsible Menu (just like how we used it for building the nested list w-list), etc.
- collapsible ↔ Element
@ContentChild('collapsibleItem'), read / write
- disabled ↔ bool
@Input('disabled'), read / write
- expanded ← bool
- hashCode → int
The hash code for this object. [...]
- runtimeType → Type
A representation of the runtime type of the object.