Component for lazy add and/or remove pages depending on the container size. Supports pop left of front page that hides when it blurs.
$my_app $mol_book
pages /
<= Nav_bar $side_menu
minimal_width 100
<= Main $main_page
minimal_width 400
pages() : $mol_view[]
The array of "pages"
event_front_up( next? : Event ) : Event
Pop left front page.
event_front_down( next? : Event ) : Event
Hide front page is its poped.