[Kde-pim] New methods for Akonadi::EntityTreeModel

[Stephen Kelly]

Kevin Krammer wrote:

> On Saturday, 2010-05-08, David Jarvie wrote:
>> I'd like to add two new methods to Akonadi::EntityTreeModel, to fetch the
>>  Collection or Item corresponding to a given Id. This is something I need
>>  to do quite frequently in KAlarm, and, since this is an easy lookup in
>>  EntityTreeModel, it seems a good idea to provide simple methods to do
>>  this, rather than having to search the model for the Id and then fetch
>>  the Collection or Item via the data() method.
> 
> Hmm, this has the advantage over direct retrieval of being synchronous but
> it only works for entities that are already in the model, while explicit
> retrieval works as long as the entity exists at all.
> 
> But if this is a common use case, i.e. to have the id, knowing that it is
> in the model but not having the entity itself, then why not.

I would prefer you to do something like this:

Collection::Id id = getId();

// Might be an EntityTreeModel or a proxy on top of it:
QAbstractItemModel *model = getModel();

QModelIndex colIndex = EntityTreeModel::modelIndexForCollection(model, 
Collection(id));
if (!colIndex)
  // Collection with that id is not in the model.
  return;

Collection fullCollection = colIndex.value<Collection>();

This has the advantage that it works even if the model you have is a proxy 
model. Obviously the index will be invalid if you use a proxy model which 
shows only items in this case. I'm guessing you'll end up using either a etm 
instance or a EntityMimeTypeFilterModel which contains only a collection 
tree.

http://api.kde.org/4.x-api/kdepimlibs-
apidocs/akonadi/html/classAkonadi_1_1EntityTreeModel.html#a5a06470b25432e5cfd953843f7968810

Does that work for you?

Steve.

> 
> Cheers,
> Kevin
> 


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