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=head2 Modification

=over 4

=item * clear - remove all data

=item * splice - modify by adding/removing items at a given point

=item * modify - changes a single entry

=back

Helper methods provide the following:

=over 4

=item * insert - splice $idx, @data, 0

=item * append - splice $idx + 1, @data, 0

=back

=head2 Events

All events are shared over a common bus for each data source, in the usual fashion - adapters and views can subscribe to the ones they're interested in, and publish events at any time.

The adapter raises these:

=over 4

=item * item_changed - the given item has been modified. by default only applies to elements that were marked as visible.

=item * splice - changes to the array which remove or add elements

=item * move - an existing element moves to a new position (some adapters may not be able to differentiate between this and splice: if in doubt, use splice instead, don't report as a move unless it's guaranteed to be existing items)

 index, length, offset (+/-)

=back

The view raises these:

=over 4

=item * visible - indicates visibility of one or more items. change events will start being sent for these items.

 visible => [1,2,3,4,5,6]

Filters may result in a list with gaps:

 visible => [1,3,4,8,9,10]

Note that "visible" means "the user is able to see this data", so they'd be a single page of data rather than the entire set when no filters are applied. Visibility changes often - scrolling will trigger a visible/hidden pair for example.

Also note that ->get may be called on any element, regardless of visibility - prefetching is one common example here.

=item * hidden - no longer visible.

 hidden => [1,2,4]

=item * selected - this item is now part of an active selection. could be used to block deletes.

 selected => [1,4,5,6]

=item * highlight - mouse over, cursor, etc.

 highlight => 1

Some views won't raise this - if touch control is involved, for example

=item * activate - some action has been performed.

 activate => [1]
 activate => [1,2,5,6,7,8]

Multi-activate will typically happen when items have been selected rather than just highlighted.

The adapter itself doesn't do much with this.

=back

=head1 METHODS

=head2 insert

Inserts data before the given position.

 $adapter->insert(3, [...])

=head2 append

Appends data after the given position.

 $adapter->append(3, [...])

=head2 push

Appends data to the end of the list.

=head2 unshift

Inserts data at the start of the list.

=head2 pop

Removes the last element from the list, will resolve with the value.

=head2 shift

Removes the first element from the list, will resolve with the value.

=head2 all

Returns all the items. Shortcut for calling
L</count> then L</get>.

=head1 INHERITED METHODS

=over 4

=item L<Adapter::Async>

L<bus|Adapter::Async/bus>, L<new|Adapter::Async/new>

=back

=head1 AUTHOR

Tom Molesworth <TEAM@cpan.org>

=head1 LICENSE

Copyright Tom Molesworth 2013-2015. Licensed under the same terms as Perl itself.