Akonadi::EntityTreeModel

#include <entitytreemodel.h>

Inheritance diagram for Akonadi::EntityTreeModel:

[legend]

Public Types
enum	CollectionFetchStrategy { FetchNoCollections , FetchFirstLevelChildCollections , FetchCollectionsRecursive , InvisibleCollectionFetch }

enum	FetchState { IdleState , FetchingState }

enum	HeaderGroup { EntityTreeHeaders , CollectionTreeHeaders , ItemListHeaders , UserHeaders = 10 , EndHeaderGroup = 32 }

enum	ItemPopulationStrategy { NoItemPopulation , ImmediatePopulation , LazyPopulation }

enum	Roles { ItemIdRole = Qt::UserRole + 1 , ItemRole = Qt::UserRole + 2 , MimeTypeRole = Qt::UserRole + 3 , CollectionIdRole = Qt::UserRole + 10 , CollectionRole = Qt::UserRole + 11 , RemoteIdRole , CollectionChildOrderRole , ParentCollectionRole , ColumnCountRole , LoadedPartsRole , AvailablePartsRole , SessionRole , CollectionRefRole , CollectionDerefRole , PendingCutRole , EntityUrlRole , UnreadCountRole , FetchStateRole , IsPopulatedRole , OriginalCollectionNameRole , DisplayNameRole , UserRole = Qt::UserRole + 500 , TerminalUserRole = 2000 , EndRole = 65535 }

Public Types inherited from QAbstractItemModel
enum	CheckIndexOption

enum	LayoutChangeHint

Signals
void	collectionFetched (int collectionId)

void	collectionPopulated (Akonadi::Collection::Id collectionId)

void	collectionTreeFetched (const Akonadi::Collection::List &collections)

Public Member Functions
	EntityTreeModel (Monitor monitor, QObject parent=nullptr)

	~EntityTreeModel () override

bool	canFetchMore (const QModelIndex &parent) const override

CollectionFetchStrategy	collectionFetchStrategy () const

int	columnCount (const QModelIndex &parent=QModelIndex()) const override

QVariant	data (const QModelIndex &index, int role=Qt::DisplayRole) const override

bool	dropMimeData (const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent) override

void	fetchMore (const QModelIndex &parent) override

Qt::ItemFlags	flags (const QModelIndex &index) const override

bool	hasChildren (const QModelIndex &parent=QModelIndex()) const override

QVariant	headerData (int section, Qt::Orientation orientation, int role=Qt::DisplayRole) const override

bool	includeRootCollection () const

QModelIndex	index (int row, int column, const QModelIndex &parent=QModelIndex()) const override

bool	isCollectionPopulated (Akonadi::Collection::Id) const

bool	isCollectionTreeFetched () const

bool	isFullyPopulated () const

ItemPopulationStrategy	itemPopulationStrategy () const

Akonadi::CollectionFetchScope::ListFilter	listFilter () const

QModelIndexList	match (const QModelIndex &start, int role, const QVariant &value, int hits=1, Qt::MatchFlags flags=Qt::MatchFlags(Qt::MatchStartsWith\|Qt::MatchWrap)) const override

QMimeData *	mimeData (const QModelIndexList &indexes) const override

QStringList	mimeTypes () const override

QModelIndex	parent (const QModelIndex &index) const override

QHash< int, QByteArray >	roleNames () const override

QString	rootCollectionDisplayName () const

int	rowCount (const QModelIndex &parent=QModelIndex()) const override

void	setCollectionFetchStrategy (CollectionFetchStrategy strategy)

void	setCollectionMonitored (const Akonadi::Collection &col, bool monitored=true)

void	setCollectionsMonitored (const Akonadi::Collection::List &collections)

bool	setData (const QModelIndex &index, const QVariant &value, int role=Qt::EditRole) override

void	setIncludeRootCollection (bool include)

void	setItemPopulationStrategy (ItemPopulationStrategy strategy)

void	setListFilter (Akonadi::CollectionFetchScope::ListFilter filter)

void	setRootCollectionDisplayName (const QString &name)

void	setShowSystemEntities (bool show)

Qt::DropActions	supportedDropActions () const override

bool	systemEntitiesShown () const

Public Member Functions inherited from QAbstractItemModel
	QAbstractItemModel (QObject *parent)

virtual QModelIndex	buddy (const QModelIndex &index) const const

virtual bool	canDropMimeData (const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent) const const

bool	checkIndex (const QModelIndex &index, CheckIndexOptions options) const const

virtual bool	clearItemData (const QModelIndex &index)

void	columnsAboutToBeInserted (const QModelIndex &parent, int first, int last)

void	columnsAboutToBeMoved (const QModelIndex &sourceParent, int sourceStart, int sourceEnd, const QModelIndex &destinationParent, int destinationColumn)

void	columnsAboutToBeRemoved (const QModelIndex &parent, int first, int last)

void	columnsInserted (const QModelIndex &parent, int first, int last)

void	columnsMoved (const QModelIndex &sourceParent, int sourceStart, int sourceEnd, const QModelIndex &destinationParent, int destinationColumn)

void	columnsRemoved (const QModelIndex &parent, int first, int last)

void	dataChanged (const QModelIndex &topLeft, const QModelIndex &bottomRight, const QList< int > &roles)

bool	hasIndex (int row, int column, const QModelIndex &parent) const const

void	headerDataChanged (Qt::Orientation orientation, int first, int last)

bool	insertColumn (int column, const QModelIndex &parent)

virtual bool	insertColumns (int column, int count, const QModelIndex &parent)

bool	insertRow (int row, const QModelIndex &parent)

virtual bool	insertRows (int row, int count, const QModelIndex &parent)

virtual QMap< int, QVariant >	itemData (const QModelIndex &index) const const

void	layoutAboutToBeChanged (const QList< QPersistentModelIndex > &parents, QAbstractItemModel::LayoutChangeHint hint)

void	layoutChanged (const QList< QPersistentModelIndex > &parents, QAbstractItemModel::LayoutChangeHint hint)

void	modelAboutToBeReset ()

void	modelReset ()

bool	moveColumn (const QModelIndex &sourceParent, int sourceColumn, const QModelIndex &destinationParent, int destinationChild)

virtual bool	moveColumns (const QModelIndex &sourceParent, int sourceColumn, int count, const QModelIndex &destinationParent, int destinationChild)

bool	moveRow (const QModelIndex &sourceParent, int sourceRow, const QModelIndex &destinationParent, int destinationChild)

virtual bool	moveRows (const QModelIndex &sourceParent, int sourceRow, int count, const QModelIndex &destinationParent, int destinationChild)

virtual void	multiData (const QModelIndex &index, QModelRoleDataSpan roleDataSpan) const const

bool	removeColumn (int column, const QModelIndex &parent)

virtual bool	removeColumns (int column, int count, const QModelIndex &parent)

bool	removeRow (int row, const QModelIndex &parent)

virtual bool	removeRows (int row, int count, const QModelIndex &parent)

virtual void	revert ()

void	rowsAboutToBeInserted (const QModelIndex &parent, int start, int end)

void	rowsAboutToBeMoved (const QModelIndex &sourceParent, int sourceStart, int sourceEnd, const QModelIndex &destinationParent, int destinationRow)

void	rowsAboutToBeRemoved (const QModelIndex &parent, int first, int last)

void	rowsInserted (const QModelIndex &parent, int first, int last)

void	rowsMoved (const QModelIndex &sourceParent, int sourceStart, int sourceEnd, const QModelIndex &destinationParent, int destinationRow)

void	rowsRemoved (const QModelIndex &parent, int first, int last)

virtual bool	setHeaderData (int section, Qt::Orientation orientation, const QVariant &value, int role)

virtual bool	setItemData (const QModelIndex &index, const QMap< int, QVariant > &roles)

virtual QModelIndex	sibling (int row, int column, const QModelIndex &index) const const

virtual void	sort (int column, Qt::SortOrder order)

virtual QSize	span (const QModelIndex &index) const const

virtual bool	submit ()

virtual Qt::DropActions	supportedDragActions () const const

Public Member Functions inherited from QObject
	QObject (QObject *parent)

QBindable< QString >	bindableObjectName ()

bool	blockSignals (bool block)

const QObjectList &	children () const const

QMetaObject::Connection	connect (const QObject sender, const char signal, const char *method, Qt::ConnectionType type) const const

void	deleteLater ()

void	destroyed (QObject *obj)

bool	disconnect (const char signal, const QObject receiver, const char *method) const const

bool	disconnect (const QObject receiver, const char method) const const

void	dumpObjectInfo () const const

void	dumpObjectTree () const const

QList< QByteArray >	dynamicPropertyNames () const const

virtual bool	event (QEvent *e)

virtual bool	eventFilter (QObject watched, QEvent event)

T	findChild (const QString &name, Qt::FindChildOptions options) const const

QList< T >	findChildren (const QRegularExpression &re, Qt::FindChildOptions options) const const

QList< T >	findChildren (const QString &name, Qt::FindChildOptions options) const const

QList< T >	findChildren (Qt::FindChildOptions options) const const

bool	inherits (const char *className) const const

void	installEventFilter (QObject *filterObj)

bool	isQuickItemType () const const

bool	isWidgetType () const const

bool	isWindowType () const const

void	killTimer (int id)

virtual const QMetaObject *	metaObject () const const

void	moveToThread (QThread *targetThread)

QString	objectName () const const

void	objectNameChanged (const QString &objectName)

QObject *	parent () const const

QVariant	property (const char *name) const const

	Q_CLASSINFO (Name, Value)

	Q_EMIT Q_EMIT

	Q_ENUM (...)

	Q_ENUM_NS (...)

	Q_ENUMS (...)

	Q_FLAG (...)

	Q_FLAG_NS (...)

	Q_FLAGS (...)

	Q_GADGET Q_GADGET

	Q_GADGET_EXPORT (EXPORT_MACRO)

	Q_INTERFACES (...)

	Q_INVOKABLE Q_INVOKABLE

	Q_MOC_INCLUDE Q_MOC_INCLUDE

	Q_NAMESPACE Q_NAMESPACE

	Q_NAMESPACE_EXPORT (EXPORT_MACRO)

	Q_OBJECT Q_OBJECT

	Q_PROPERTY (...)

	Q_REVISION Q_REVISION

	Q_SET_OBJECT_NAME (Object)

	Q_SIGNAL Q_SIGNAL

	Q_SIGNALS Q_SIGNALS

	Q_SLOT Q_SLOT

	Q_SLOTS Q_SLOTS

T	qobject_cast (const QObject *object)

T	qobject_cast (QObject *object)

	QT_NO_NARROWING_CONVERSIONS_IN_CONNECT QT_NO_NARROWING_CONVERSIONS_IN_CONNECT

void	removeEventFilter (QObject *obj)

void	setObjectName (const QString &name)

void	setObjectName (QAnyStringView name)

void	setParent (QObject *parent)

bool	setProperty (const char *name, const QVariant &value)

bool	setProperty (const char *name, QVariant &&value)

bool	signalsBlocked () const const

int	startTimer (int interval, Qt::TimerType timerType)

int	startTimer (std::chrono::milliseconds interval, Qt::TimerType timerType)

QThread *	thread () const const

Static Public Member Functions
static QModelIndexList	modelIndexesForItem (const QAbstractItemModel *model, const Item &item)

static QModelIndex	modelIndexForCollection (const QAbstractItemModel *model, const Collection &collection)

static Collection	updatedCollection (const QAbstractItemModel *model, const Collection &col)

static Collection	updatedCollection (const QAbstractItemModel *model, qint64 collectionId)

Static Public Member Functions inherited from QObject
QMetaObject::Connection	connect (const QObject sender, const char signal, const QObject receiver, const char method, Qt::ConnectionType type)

QMetaObject::Connection	connect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method, Qt::ConnectionType type)

QMetaObject::Connection	connect (const QObject sender, PointerToMemberFunction signal, const QObject context, Functor functor, Qt::ConnectionType type)

QMetaObject::Connection	connect (const QObject sender, PointerToMemberFunction signal, const QObject receiver, PointerToMemberFunction method, Qt::ConnectionType type)

QMetaObject::Connection	connect (const QObject *sender, PointerToMemberFunction signal, Functor functor)

bool	disconnect (const QMetaObject::Connection &connection)

bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char method)

bool	disconnect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method)

bool	disconnect (const QObject sender, PointerToMemberFunction signal, const QObject receiver, PointerToMemberFunction method)

QString	tr (const char sourceText, const char disambiguation, int n)

Protected Member Functions
void	clearAndReset ()

virtual int	entityColumnCount (HeaderGroup headerGroup) const

virtual QVariant	entityData (const Collection &collection, int column, int role=Qt::DisplayRole) const

virtual QVariant	entityData (const Item &item, int column, int role=Qt::DisplayRole) const

virtual QVariant	entityHeaderData (int section, Qt::Orientation orientation, int role, HeaderGroup headerGroup) const

Protected Member Functions inherited from QAbstractItemModel
void	beginInsertColumns (const QModelIndex &parent, int first, int last)

void	beginInsertRows (const QModelIndex &parent, int first, int last)

bool	beginMoveColumns (const QModelIndex &sourceParent, int sourceFirst, int sourceLast, const QModelIndex &destinationParent, int destinationChild)

bool	beginMoveRows (const QModelIndex &sourceParent, int sourceFirst, int sourceLast, const QModelIndex &destinationParent, int destinationChild)

void	beginRemoveColumns (const QModelIndex &parent, int first, int last)

void	beginRemoveRows (const QModelIndex &parent, int first, int last)

void	beginResetModel ()

void	changePersistentIndex (const QModelIndex &from, const QModelIndex &to)

void	changePersistentIndexList (const QModelIndexList &from, const QModelIndexList &to)

QModelIndex	createIndex (int row, int column, const void *ptr) const const

QModelIndex	createIndex (int row, int column, quintptr id) const const

void	endInsertColumns ()

void	endInsertRows ()

void	endMoveColumns ()

void	endMoveRows ()

void	endRemoveColumns ()

void	endRemoveRows ()

void	endResetModel ()

QModelIndexList	persistentIndexList () const const

virtual void	resetInternalData ()

Protected Member Functions inherited from QObject
virtual void	childEvent (QChildEvent *event)

virtual void	connectNotify (const QMetaMethod &signal)

virtual void	customEvent (QEvent *event)

virtual void	disconnectNotify (const QMetaMethod &signal)

bool	isSignalConnected (const QMetaMethod &signal) const const

int	receivers (const char *signal) const const

QObject *	sender () const const

int	senderSignalIndex () const const

virtual void	timerEvent (QTimerEvent *event)

Additional Inherited Members
Properties inherited from QObject
	objectName

Public Attributes inherited from QAbstractItemModel
typedef	CheckIndexOptions

	DoNotUseParent

	HorizontalSortHint

	IndexIsValid

	NoLayoutChangeHint

	NoOption

	ParentIsInvalid

	VerticalSortHint

Public Attributes inherited from QObject
typedef	QObjectList

Detailed Description

A model for collections and items together.

Akonadi models and views provide a high level way to interact with the akonadi server. Most applications will use these classes.

Models provide an interface for viewing, updating, deleting and moving Items and Collections. Additionally, the models are updated automatically if another application changes the data or inserts of deletes items etc.

Note: The EntityTreeModel should be used with the EntityTreeView or the EntityListView class either directly or indirectly via proxy models.

Retrieving Collections and Items from the model

If you want to retrieve and Item or Collection from the model, and already have a valid QModelIndex for the correct row, the Collection can be retrieved like this:

Collection col = index.data(EntityTreeModel::CollectionRole).value<Collection>();

Akonadi::Collection

Represents a collection of PIM items.

Definition collection.h:62

Akonadi::EntityTreeModel::CollectionRole

@ CollectionRole

The collection.

Definition entitytreemodel.h:323

QModelIndex::data

QVariant data(int role) const const

QObject::qobject_cast

T qobject_cast(QObject *object)

QVariant::value

T value() const const

And similarly for Items. This works even if there is a proxy model between the calling code and the EntityTreeModel.

If you want to retrieve a Collection for a particular Collection::Id and you do not yet have a valid QModelIndex, use modelIndexForCollection.

Using EntityTreeModel in your application

The responsibilities which fall to the application developer are

Configuring the Monitor and EntityTreeModel
Making use of this class via proxy models
Subclassing for type specific display information

Creating and configuring the EntityTreeModel

This class is a wrapper around a Akonadi::Monitor object. The model represents a part of the collection and item tree configured in the Monitor. The structure of the model mirrors the structure of Collections and Items on the Akonadi server.

The following code creates a model which fetches items and collections relevant to addressees (contacts), and automatically manages keeping the items up to date.

auto monitor = new Monitor(this);
monitor->setCollectionMonitored(Collection::root());
monitor->setMimeTypeMonitored(KContacts::Addressee::mimeType());
monitor->setSession(session);
 
auto model = new EntityTreeModel(monitor, this);
 
auto view = new EntityTreeView(this);
view->setModel(model);

The EntityTreeModel will show items of a different type by changing the line

monitor->setMimeTypeMonitored(KContacts::Addressee::mimeType());

to a different mimetype. KContacts::Addressee::mimeType() is an alias for "text/directory". If changed to KMime::Message::mimeType() (an alias for "message/rfc822") the model would instead contain emails. The model can be configured to contain items of any mimetype known to Akonadi.

Note: The EntityTreeModel does some extra configuration on the Monitor, such as setting itemFetchScope() and collectionFetchScope() to retrieve all ancestors. This is necessary for proper function of the model.

See also: Akonadi::ItemFetchScope::AncestorRetrieval.; akonadi-mimetypes.

The EntityTreeModel can be further configured for certain behaviours such as fetching of collections and items.

The model can be configured to not fetch items into the model (ie, fetch collections only) by setting

entityTreeModel->setItemPopulationStrategy(EntityTreeModel::NoItemPopulation);

Akonadi::EntityTreeModel::NoItemPopulation

@ NoItemPopulation

Do not include items in the model.

Definition entitytreemodel.h:396

The items may be fetched lazily, i.e. not inserted into the model until request by the user for performance reasons.

The Collection tree is always built immediately if Collections are to be fetched.

entityTreeModel->setItemPopulationStrategy(EntityTreeModel::LazyPopulation);

Akonadi::EntityTreeModel::LazyPopulation

@ LazyPopulation

Fetch items only when requested (using canFetchMore/fetchMore)

Definition entitytreemodel.h:398

This will typically be used with a EntityMimeTypeFilterModel in a configuration such as KMail or AkonadiConsole.

The CollectionFetchStrategy determines how the model will be populated with Collections. That is, if FetchNoCollections is set, no collections beyond the root of the model will be fetched. This can be used in combination with setting a particular Collection to monitor.

// Get an collection id from a config file.
Collection::Id id;
monitor->setCollectionMonitored(Collection(id));
// ... Other initialization code.
entityTree->setCollectionFetchStrategy(FetchNoCollections);

This has the effect of creating a model of only a list of Items, and not collections. This is similar in behaviour and aims to the ItemModel. By using FetchFirstLevelCollections instead, a mixed list of entities can be created.

Note: It is important that you set only one Collection to be monitored in the monitor object. This one collection will be the root of the tree. If you need a model with a more complex structure, consider monitoring a common ancestor and using a SelectionProxyModel.

See also: lazy-model-population

It is also possible to show the root Collection as part of the selectable model:

entityTree->setIncludeRootCollection(true);

By default the displayed name of the root collection is '[*]', because it doesn't require i18n, and is generic. It can be changed too.

entityTree->setIncludeRootCollection(true);

entityTree->setRootCollectionDisplayName(i18nc("Name of top level for all addressbooks in the application", "[All AddressBooks]"))

i18nc

QString i18nc(const char *context, const char *text, const TYPE &arg...)

This feature is used in KAddressBook.

If items are to be fetched by the model, it is necessary to specify which parts of the items are to be fetched, using the ItemFetchScope class. By default, only the basic metadata is fetched. To fetch all item data, including all attributes:

monitor->itemFetchScope().fetchFullPayload();

monitor->itemFetchScope().fetchAllAttributes();

Using EntityTreeModel with Proxy models

An Akonadi::SelectionProxyModel can be used to simplify managing selection in one view through multiple proxy models to a representation in another view. The selectionModel of the initial view is used to create a proxied model which filters out anything not related to the current selection.

// ... create an EntityTreeModel
 
collectionTree = new EntityMimeTypeFilterModel(this);
collectionTree->setSourceModel(entityTreeModel);
 
// Include only collections in this proxy model.
collectionTree->addMimeTypeInclusionFilter(Collection::mimeType());
collectionTree->setHeaderGroup(EntityTreeModel::CollectionTreeHeaders);
 
treeview->setModel(collectionTree);
 
// SelectionProxyModel can handle complex selections:
treeview->setSelectionMode(QAbstractItemView::ExtendedSelection);
 
auto selProxy = new SelectionProxyModel(treeview->selectionModel(), this);
selProxy->setSourceModel(entityTreeModel);
 
itemList = new EntityMimeTypeFilterModel(this);
itemList->setSourceModel(selProxy);
 
// Filter out collections. Show only items.
itemList->addMimeTypeExclusionFilter(Collection::mimeType());
itemList->setHeaderGroup(EntityTreeModel::ItemListHeaders);
 
auto itemView = new EntityTreeView(splitter);
itemView->setModel(itemList);

The SelectionProxyModel can handle complex selections.

See the KSelectionProxyModel documentation for the valid configurations of a Akonadi::SelectionProxyModel.

Obviously, the SelectionProxyModel may be used in a view, or further processed with other proxy models. Typically, the result from this model will be further filtered to remove collections from the item list as in the above example.

There are several advantages of using EntityTreeModel with the SelectionProxyModel, namely the items can be fetched and cached instead of being fetched many times, and the chain of proxies from the core model to the view is automatically handled. There is no need to manage all the mapToSource and mapFromSource calls manually.

A KDescendantsProxyModel can be used to represent all descendants of a model as a flat list. For example, to show all descendant items in a selected Collection in a list:

auto collectionTree = new EntityMimeTypeFilterModel(this);
collectionTree->setSourceModel(entityTreeModel);
 
// Include only collections in this proxy model.
collectionTree->addMimeTypeInclusionFilter(Collection::mimeType());
collectionTree->setHeaderGroup(EntityTreeModel::CollectionTreeHeaders);
 
treeview->setModel(collectionTree);
 
auto selProxy = new SelectionProxyModel(treeview->selectionModel(), this);
selProxy->setSourceModel(entityTreeModel);
 
auto descendedList = new KDescendantsProxyModel(this);
descendedList->setSourceModel(selProxy);
 
auto itemList = new EntityMimeTypeFilterModel(this);
itemList->setSourceModel(descendedList);
 
// Exclude collections from the list view.
itemList->addMimeTypeExclusionFilter(Collection::mimeType());
itemList->setHeaderGroup(EntityTreeModel::ItemListHeaders);
 
listView = new EntityTreeView(this);
listView->setModel(itemList);

Note that it is important in this case to use the KDescendantsProxyModel before the EntityMimeTypeFilterModel. Otherwise, by filtering out the collections first, you would also be filtering out their child items.

This pattern is used in KAddressBook.

It would not make sense to use a KDescendantsProxyModel with LazyPopulation.

Subclassing EntityTreeModel

Usually an application will create a subclass of an EntityTreeModel and use that in several views via proxy models.

The subclassing is necessary in order for the data in the model to have type-specific representation in applications

For example, the headerData for an EntityTreeModel will be different depending on whether it is in a view showing only Collections in which case the header data should be "AddressBooks" for example, or only Items, in which case the headerData would be for example "Family Name", "Given Name" and "Email address" for contacts or "Subject", "Sender", "Date" in the case of emails.

Additionally, the actual data shown in the rows of the model should be type specific.

In summary, it must be possible to have different numbers of columns, different data in the rows of those columns, and different titles for each column depending on the contents of the view.

The way this is accomplished is by using the EntityMimeTypeFilterModel for splitting the model into a "CollectionTree" and an "Item List" as in the above example, and using a type-specific EntityTreeModel subclass to return the type-specific data, typically for only one type (for example, contacts or emails).

The following protected virtual methods should be implemented in the subclass:

int entityColumnCount( HeaderGroup headerGroup ) const; – Implement to return the number of columns for a HeaderGroup. If the HeaderGroup is CollectionTreeHeaders, return the number of columns to display for the Collection tree, and if it is ItemListHeaders, return the number of columns to display for the item. In the case of addressee, this could be for example, two (for given name and family name) or for emails it could be three (for subject, sender, date). This is a decision of the subclass implementor.
QVariant entityHeaderData( int section, Qt::Orientation orientation, int role, HeaderGroup headerGroup ) const; – Implement to return the data for each section for a HeaderGroup. For example, if the header group is CollectionTreeHeaders in a contacts model, the string "Address books" might be returned for column 0, whereas if the headerGroup is ItemListHeaders, the strings "Given Name", "Family Name", "Email Address" might be returned for the columns 0, 1, and 2.
QVariant entityData( const Collection &collection, int column, int role = Qt::DisplayRole ) const; – Implement to return data for a particular Collection. Typically this will be the name of the collection or the EntityDisplayAttribute.
QVariant entityData(const Item &item, int column, int role = Qt::DisplayRole) const; – Implement to return the data for a particular item and column. In the case of email for example, this would be the actual subject, sender and date of the email.

Note: The entityData methods are just for convenience. the QAbstractItemModel::data method can be overridden if required.

The application writer must then properly configure proxy models for the views, so that the correct data is shown in the correct view. That is the purpose of these lines in the above example

collectionTree->setHeaderGroup(EntityTreeModel::CollectionTreeHeaders);

itemList->setHeaderGroup(EntityTreeModel::ItemListHeaders);

Progress reporting

The EntityTreeModel uses asynchronous Akonadi::Job instances to fill and update itself. For example, a job is run to fetch the contents of collections (that is, list the items in it). Additionally, individual Akonadi::Items can be fetched in different parts at different times.

To indicate that such a job is underway, the EntityTreeModel makes the FetchState available. The FetchState returned from a QModelIndex representing a Akonadi::Collection will be FetchingState if a listing of the items in that collection is underway, otherwise the state is IdleState.

Author: Stephen Kelly steve.nosp@m.ire@.nosp@m.gmail.nosp@m..com

Since: 4.4

Definition at line 305 of file entitytreemodel.h.

Member Enumeration Documentation

◆ CollectionFetchStrategy

enum Akonadi::EntityTreeModel::CollectionFetchStrategy

Describes what collections shall be fetched by and represent in the model.

Enumerator
FetchNoCollections	Fetches nothing. This creates an empty model.
FetchFirstLevelChildCollections	Fetches first level collections in the root collection.
FetchCollectionsRecursive	Fetches collections in the root collection recursively. This is the default.
InvisibleCollectionFetch	Fetches collections, but does not put them in the model. This can be used to create a list of items in all collections. The ParentCollectionRole can still be used to retrieve the parent collection of an Item. Since 4.5

Definition at line 484 of file entitytreemodel.h.

◆ FetchState

enum Akonadi::EntityTreeModel::FetchState

Describes the state of fetch jobs related to particular collections.

QModelIndex collectionIndex = getIndex();
if (collectionIndex.data(EntityTreeModel::FetchStateRole).toLongLong() == FetchingState) {
  // There is a fetch underway
} else {
  // There is no fetch underway.
}

Since: 4.5

Enumerator
IdleState	There is no fetch of items in this collection in progress.
FetchingState	There is a fetch of items in this collection in progress.

Definition at line 360 of file entitytreemodel.h.

◆ HeaderGroup

enum Akonadi::EntityTreeModel::HeaderGroup

Describes what header information the model shall return.

Enumerator
EntityTreeHeaders	Header information for a tree with collections and items.
CollectionTreeHeaders	Header information for a collection-only tree.
ItemListHeaders	Header information for a list of items.
UserHeaders	Last header information for submodel extensions.
EndHeaderGroup	Last headergroup role. Don't use a role beyond this or headerData will break.

Definition at line 370 of file entitytreemodel.h.

◆ ItemPopulationStrategy

enum Akonadi::EntityTreeModel::ItemPopulationStrategy

Describes how the model should populated its items.

Enumerator
NoItemPopulation	Do not include items in the model.
ImmediatePopulation	Retrieve items immediately when their parent is in the model. This is the default.
LazyPopulation	Fetch items only when requested (using canFetchMore/fetchMore)

Definition at line 395 of file entitytreemodel.h.

◆ Roles

enum Akonadi::EntityTreeModel::Roles

Describes the roles for items.

Roles for collections are defined by the superclass.

Enumerator
ItemIdRole	The item id.
ItemRole	The Item.
MimeTypeRole	The mimetype of the entity.
CollectionIdRole	The collection id.
CollectionRole	The collection.
RemoteIdRole	The remoteId of the entity.
CollectionChildOrderRole	Ordered list of child items if available.
ParentCollectionRole	The parent collection of the entity.
ColumnCountRole	Used by proxies to determine the number of columns for a header group.
LoadedPartsRole	Parts available in the model for the item.
AvailablePartsRole	Parts available in the Akonadi server for the item.
SessionRole	The Session used by this model
CollectionRefRole	Used to increase the reference count on a Collection
CollectionDerefRole	Used to decrease the reference count on a Collection
PendingCutRole	Used to indicate items which are to be cut.
EntityUrlRole	The akonadi:/ Url of the entity as a string. Item urls will contain the mimetype.
UnreadCountRole	Returns the number of unread items in a collection. Since 4.5
FetchStateRole	Returns the FetchState of a particular item. Since 4.5
IsPopulatedRole	Returns whether a Collection has been populated, i.e. whether its items have been fetched. Since 4.10
OriginalCollectionNameRole	Returns original name for collection. Since 4.14
DisplayNameRole	Returns the same as Qt::DisplayRole.
UserRole	First role for user extensions.
TerminalUserRole	Last role for user extensions. Don't use a role beyond this or headerData will break.

Definition at line 313 of file entitytreemodel.h.

Constructor & Destructor Documentation

◆ EntityTreeModel()

EntityTreeModel::EntityTreeModel	(	Monitor *	monitor,
		QObject *	parent = nullptr )

explicit

Creates a new entity tree model.

Parameters

monitor	The Monitor whose entities should be represented in the model.
parent	The parent object.

Definition at line 37 of file entitytreemodel.cpp.

◆ ~EntityTreeModel()

EntityTreeModel::~EntityTreeModel ( )

override

Destroys the entity tree model.

Definition at line 52 of file entitytreemodel.cpp.

Member Function Documentation

◆ canFetchMore()

bool EntityTreeModel::canFetchMore ( const QModelIndex & parent ) const

overridevirtual

Reimplemented from QAbstractItemModel.

Definition at line 816 of file entitytreemodel.cpp.

◆ clearAndReset()

void EntityTreeModel::clearAndReset ( )

protected

Clears and resets the model.

Always call this instead of the reset method in the superclass. Using the reset method will not reliably clear or refill the model.

Definition at line 108 of file entitytreemodel.cpp.

◆ collectionFetched

void Akonadi::EntityTreeModel::collectionFetched ( int collectionId )

signal

Emitted once a collection has been fetched for the very first time.

This is like a dataChanged(), but specific to the initial loading, in order to update the GUI (window caption, state of actions). Usually, the GUI uses Akonadi::Monitor to be notified of further changes to the collections.

Parameters

collectionId the identifier of the fetched collection

Since: 4.9.3

◆ collectionFetchStrategy()

EntityTreeModel::CollectionFetchStrategy EntityTreeModel::collectionFetchStrategy ( ) const

Returns the collection fetch strategy of the model.

Definition at line 1039 of file entitytreemodel.cpp.

◆ collectionPopulated

void Akonadi::EntityTreeModel::collectionPopulated ( Akonadi::Collection::Id collectionId )

signal

Signal emitted when a collection has been populated, i.e.

its items have been fetched.

Parameters

collectionId id of the collection which has been populated

See also: collectionTreeFetched

Since: 4.10

◆ collectionTreeFetched

void Akonadi::EntityTreeModel::collectionTreeFetched ( const Akonadi::Collection::List & collections )

signal

Signal emitted when the collection tree has been fetched for the first time.

Parameters

collections list of collections which have been fetched

See also: isCollectionTreeFetched, collectionPopulated

Since: 4.10

◆ columnCount()

int EntityTreeModel::columnCount ( const QModelIndex & parent = QModelIndex() ) const

overridevirtual

Implements QAbstractItemModel.

Definition at line 144 of file entitytreemodel.cpp.

◆ data()

QVariant EntityTreeModel::data	(	const QModelIndex &	index,
		int	role = Qt::DisplayRole ) const

overridevirtual

Implements QAbstractItemModel.

Definition at line 223 of file entitytreemodel.cpp.

◆ dropMimeData()

bool EntityTreeModel::dropMimeData	(	const QMimeData *	data,
		Qt::DropAction	action,
		int	row,
		int	column,
		const QModelIndex &	parent )

overridevirtual

Reimplemented from QAbstractItemModel.

Definition at line 416 of file entitytreemodel.cpp.

◆ entityColumnCount()

int EntityTreeModel::entityColumnCount ( HeaderGroup headerGroup ) const

protectedvirtual

Definition at line 653 of file entitytreemodel.cpp.

◆ entityData() [1/2]

QVariant EntityTreeModel::entityData	(	const Collection &	collection,
		int	column,
		int	role = Qt::DisplayRole ) const

protectedvirtual

Provided for convenience of subclasses.

Definition at line 182 of file entitytreemodel.cpp.

◆ entityData() [2/2]

QVariant EntityTreeModel::entityData	(	const Item &	item,
		int	column,
		int	role = Qt::DisplayRole ) const

protectedvirtual

Provided for convenience of subclasses.

Definition at line 154 of file entitytreemodel.cpp.

◆ entityHeaderData()

QVariant EntityTreeModel::entityHeaderData	(	int	section,
		Qt::Orientation	orientation,
		int	role,
		HeaderGroup	headerGroup ) const

protectedvirtual

Reimplement this to provide different header data.

This is needed when using one model with multiple proxies and views, and each should show different header data.

Definition at line 661 of file entitytreemodel.cpp.

◆ fetchMore()

void EntityTreeModel::fetchMore ( const QModelIndex & parent )

overridevirtual

Reimplemented from QAbstractItemModel.

Definition at line 822 of file entitytreemodel.cpp.

◆ flags()

Qt::ItemFlags EntityTreeModel::flags ( const QModelIndex & index ) const

overridevirtual

Reimplemented from QAbstractItemModel.

Definition at line 335 of file entitytreemodel.cpp.

◆ hasChildren()

bool EntityTreeModel::hasChildren ( const QModelIndex & parent = QModelIndex() ) const

overridevirtual

Reimplemented from QAbstractItemModel.

Definition at line 848 of file entitytreemodel.cpp.

◆ headerData()

QVariant EntityTreeModel::headerData	(	int	section,
		Qt::Orientation	orientation,
		int	role = Qt::DisplayRole ) const

overridevirtual

Reimplemented from QAbstractItemModel.

Definition at line 677 of file entitytreemodel.cpp.

◆ includeRootCollection()

bool EntityTreeModel::includeRootCollection ( ) const

Returns whether the root collection is provided by the model.

Definition at line 994 of file entitytreemodel.cpp.

◆ index()

QModelIndex EntityTreeModel::index	(	int	row,
		int	column,
		const QModelIndex &	parent = QModelIndex() ) const

overridevirtual

Implements QAbstractItemModel.

Definition at line 539 of file entitytreemodel.cpp.

◆ isCollectionPopulated()

bool EntityTreeModel::isCollectionPopulated ( Akonadi::Collection::Id id ) const

Returns whether the collection has been populated.

See also: collectionPopulated

Since: 4.12

Definition at line 869 of file entitytreemodel.cpp.

◆ isCollectionTreeFetched()

bool EntityTreeModel::isCollectionTreeFetched ( ) const

Returns whether the collection tree has been fetched at initialisation.

See also: collectionTreeFetched

Since: 4.10

Definition at line 863 of file entitytreemodel.cpp.

◆ isFullyPopulated()

bool EntityTreeModel::isFullyPopulated ( ) const

Returns whether the model is fully populated.

Returns true once the collection tree has been fetched and all collections have been populated.

See also: isCollectionPopulated; isCollectionTreeFetched

Since: 4.14

Definition at line 875 of file entitytreemodel.cpp.

◆ itemPopulationStrategy()

EntityTreeModel::ItemPopulationStrategy EntityTreeModel::itemPopulationStrategy ( ) const

Returns the item population strategy of the model.

Definition at line 980 of file entitytreemodel.cpp.

◆ listFilter()

CollectionFetchScope::ListFilter EntityTreeModel::listFilter ( ) const

Returns the currently used listfilter.

Since: 4.14

Definition at line 61 of file entitytreemodel.cpp.

◆ match()

QModelIndexList EntityTreeModel::match	(	const QModelIndex &	start,
		int	role,
		const QVariant &	value,
		int	hits = 1,
		Qt::MatchFlags	flags = Qt::MatchFlags(Qt::MatchStartsWith \| Qt::MatchWrap) ) const

overridevirtual

Reimplemented to handle the AmazingCompletionRole.

Reimplemented from QAbstractItemModel.

Definition at line 881 of file entitytreemodel.cpp.

◆ mimeData()

QMimeData * EntityTreeModel::mimeData ( const QModelIndexList & indexes ) const

overridevirtual

Reimplemented from QAbstractItemModel.

Definition at line 685 of file entitytreemodel.cpp.

◆ mimeTypes()

QStringList EntityTreeModel::mimeTypes ( ) const

overridevirtual

Reimplemented from QAbstractItemModel.

Definition at line 410 of file entitytreemodel.cpp.

◆ modelIndexesForItem()

QModelIndexList EntityTreeModel::modelIndexesForItem	(	const QAbstractItemModel *	model,
		const Item &	item )

static

Returns a QModelIndex in model which points to item.

This method can be used through proxy models if model is a proxy model.

Parameters

model	the model to query for the item
item	the item to look for

See also: modelIndexForCollection

Since: 4.5

Definition at line 1081 of file entitytreemodel.cpp.

◆ modelIndexForCollection()

QModelIndex EntityTreeModel::modelIndexForCollection	(	const QAbstractItemModel *	model,
		const Collection &	collection )

static

Returns a QModelIndex in model which points to collection.

This method can be used through proxy models if model is a proxy model.

EntityTreeModel *model = getEntityTreeModel();
QSortFilterProxyModel *proxy1 = new QSortFilterProxyModel;
proxy1->setSourceModel(model);
QSortFilterProxyModel *proxy2 = new QSortFilterProxyModel;
proxy2->setSourceModel(proxy1);
 
...
 
QModelIndex idx = EntityTreeModel::modelIndexForCollection(proxy2, Collection(colId));
if (!idx.isValid())
  // Collection with id colId is not in the proxy2.
  // Maybe it is filtered out if proxy 2 is only showing items? Make sure you use the correct proxy.
  return;
 
Collection collection = idx.data( EntityTreeModel::CollectionRole ).value<Collection>();
// collection has the id colId, and all other attributes already fetched by the model such as name, remoteId, Akonadi::Attributes etc.

This can be useful for example if an id is stored in a config file and needs to be used in the application.

Note however, that to restore view state such as scrolling, selection and expansion of items in trees, the ETMViewStateSaver can be used for convenience.

See also: modelIndexesForItem

Since: 4.5

Definition at line 1069 of file entitytreemodel.cpp.

◆ parent()

QModelIndex EntityTreeModel::parent ( const QModelIndex & index ) const

overridevirtual

Implements QAbstractItemModel.

Definition at line 574 of file entitytreemodel.cpp.

◆ roleNames()

QHash< int, QByteArray > EntityTreeModel::roleNames ( ) const

overridevirtual

Reimplemented from QAbstractItemModel.

Definition at line 115 of file entitytreemodel.cpp.

◆ rootCollectionDisplayName()

QString EntityTreeModel::rootCollectionDisplayName ( ) const

Returns the display name of the root collection.

Definition at line 1008 of file entitytreemodel.cpp.

◆ rowCount()

int EntityTreeModel::rowCount ( const QModelIndex & parent = QModelIndex() ) const

overridevirtual

Implements QAbstractItemModel.

Definition at line 615 of file entitytreemodel.cpp.

◆ setCollectionFetchStrategy()

void EntityTreeModel::setCollectionFetchStrategy ( CollectionFetchStrategy strategy )

Sets the collection fetch strategy of the model.

Definition at line 1014 of file entitytreemodel.cpp.

◆ setCollectionMonitored()

void EntityTreeModel::setCollectionMonitored	(	const Akonadi::Collection &	col,
		bool	monitored = true )

Adds or removes a specific collection from the monitored set without resetting the model.

Only call this if you're monitoring specific collections (not mimetype/resources/items).

Since: 4.14

See also: setCollectionsMonitored()

Definition at line 90 of file entitytreemodel.cpp.

◆ setCollectionsMonitored()

void EntityTreeModel::setCollectionsMonitored ( const Akonadi::Collection::List & collections )

Monitors the specified collections and resets the model.

Since: 4.14

Definition at line 76 of file entitytreemodel.cpp.

◆ setData()

bool EntityTreeModel::setData	(	const QModelIndex &	index,
		const QVariant &	value,
		int	role = Qt::EditRole )

overridevirtual

Reimplemented from QAbstractItemModel.

Definition at line 721 of file entitytreemodel.cpp.

◆ setIncludeRootCollection()

void EntityTreeModel::setIncludeRootCollection ( bool include )

Sets whether the root collection shall be provided by the model.

Parameters

include enables root collection if set as true

See also: setRootCollectionDisplayName()

Definition at line 986 of file entitytreemodel.cpp.

◆ setItemPopulationStrategy()

void EntityTreeModel::setItemPopulationStrategy ( ItemPopulationStrategy strategy )

Sets the item population strategy of the model.

Definition at line 953 of file entitytreemodel.cpp.

◆ setListFilter()

void EntityTreeModel::setListFilter ( Akonadi::CollectionFetchScope::ListFilter filter )

Sets the currently used listfilter.

Since: 4.14

Definition at line 67 of file entitytreemodel.cpp.

◆ setRootCollectionDisplayName()

void EntityTreeModel::setRootCollectionDisplayName ( const QString & name )

Sets the display name of the root collection of the model.

The default display name is "[*]".

Parameters

name	the name to display for the root collection

Note: The display name for the root collection is only used if the root collection has been included with setIncludeRootCollection().

Definition at line 1000 of file entitytreemodel.cpp.

◆ setShowSystemEntities()

void EntityTreeModel::setShowSystemEntities ( bool show )

Some Entities are hidden in the model, but exist for internal purposes, for example, custom object directories in groupware resources.

They are hidden by default, but can be shown by setting show to true.

Parameters

show	enabled displaying of hidden entities if set as `true` Most applications will not need to use this feature.

Definition at line 102 of file entitytreemodel.cpp.

◆ supportedDropActions()

Qt::DropActions EntityTreeModel::supportedDropActions ( ) const

overridevirtual

Reimplemented from QAbstractItemModel.

Definition at line 405 of file entitytreemodel.cpp.

◆ systemEntitiesShown()

bool EntityTreeModel::systemEntitiesShown ( ) const

Returns true if internal system entities are shown, and false otherwise.

Definition at line 96 of file entitytreemodel.cpp.

◆ updatedCollection() [1/2]

Collection EntityTreeModel::updatedCollection	(	const QAbstractItemModel *	model,
		const Collection &	col )

static

Definition at line 1118 of file entitytreemodel.cpp.

◆ updatedCollection() [2/2]

Collection EntityTreeModel::updatedCollection	(	const QAbstractItemModel *	model,
		qint64	collectionId )

static

Returns an Akonadi::Collection from the model based on given collectionId.

This is faster and simpler than retrieving a full Collection from the ETM by using modelIndexForCollection() and then querying for the index data.

Definition at line 1101 of file entitytreemodel.cpp.

The documentation for this class was generated from the following files:

KDE's Doxygen guidelines are available online.

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About Akonadi

Akonadi::EntityTreeModel

Public Types

Signals

Public Member Functions

Static Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Retrieving Collections and Items from the model

Using EntityTreeModel in your application

Creating and configuring the EntityTreeModel

Using EntityTreeModel with Proxy models

Subclassing EntityTreeModel

Progress reporting

Member Enumeration Documentation

◆ CollectionFetchStrategy

◆ FetchState

◆ HeaderGroup

◆ ItemPopulationStrategy

◆ Roles

Constructor & Destructor Documentation

◆ EntityTreeModel()

◆ ~EntityTreeModel()

Member Function Documentation

◆ canFetchMore()

◆ clearAndReset()

◆ collectionFetched

◆ collectionFetchStrategy()

◆ collectionPopulated

◆ collectionTreeFetched

◆ columnCount()

◆ data()

◆ dropMimeData()

◆ entityColumnCount()

◆ entityData() [1/2]

◆ entityData() [2/2]

◆ entityHeaderData()

◆ fetchMore()

◆ flags()

◆ hasChildren()

◆ headerData()

◆ includeRootCollection()

◆ index()

◆ isCollectionPopulated()

◆ isCollectionTreeFetched()

◆ isFullyPopulated()

◆ itemPopulationStrategy()

◆ listFilter()

◆ match()

◆ mimeData()

◆ mimeTypes()

◆ modelIndexesForItem()

◆ modelIndexForCollection()

◆ parent()

◆ roleNames()

◆ rootCollectionDisplayName()

◆ rowCount()

◆ setCollectionFetchStrategy()

◆ setCollectionMonitored()

◆ setCollectionsMonitored()

◆ setData()

◆ setIncludeRootCollection()

◆ setItemPopulationStrategy()

◆ setListFilter()

◆ setRootCollectionDisplayName()

◆ setShowSystemEntities()

◆ supportedDropActions()

◆ systemEntitiesShown()

◆ updatedCollection() [1/2]

◆ updatedCollection() [2/2]