Utility method that retrieves all children and recursively searches for all media objects that satisfy the given search expression in
this container.
expression |
the search expression or `null` for wildcard |
offset |
zero-based index of the first object to return |
max_count |
maximum number of objects to return |
total_matches |
sets it to the actual number of objects that satisfy the given search expression. If it is not possible to compute this value (in a
timely mannger), it is set to '0'. |
cancellable |
optional cancellable for this operation |