A data collection item for file based data collections (e.g. More...

#include <qgsfilebaseddataitemprovider.h>

Inheritance diagram for QgsFileDataCollectionItem:

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Public Member Functions
	QgsFileDataCollectionItem (QgsDataItem *parent, const QString &name, const QString &path, const QList< QgsProviderSublayerDetails > &sublayers, const QVariantMap &extraUriParts=QVariantMap())
	Constructor for QgsFileDataCollectionItem.

bool	canAddVectorLayers () const
	Returns `true` if the file is likely to support addition of vector layers.

QVector< QgsDataItem * >	createChildren () override
	Create children.

QgsAbstractDatabaseProviderConnection *	databaseConnection () const override
	For data items that represent a DB connection or one of its children, this method returns a connection.

QgsAbstractDatabaseProviderConnection::Capabilities	databaseConnectionCapabilities () const
	Returns the associated connection capabilities, if a databaseConnection() is available.

Qgis::DatabaseProviderConnectionCapabilities2	databaseConnectionCapabilities2 () const
	Returns extended connection capabilities, if a databaseConnection() is available.

bool	hasDragEnabled () const override
	Returns `true` if the item may be dragged.

QgsMimeDataUtils::UriList	mimeUris () const override
	Returns mime URIs for the data item, most data providers will only return a single URI but some data collection items (e.g.

QList< QgsProviderSublayerDetails >	sublayers () const
	Returns the sublayers.

Public Member Functions inherited from QgsDataCollectionItem
	QgsDataCollectionItem (QgsDataItem *parent, const QString &name, const QString &path=QString(), const QString &providerKey=QString())
	Constructor for QgsDataCollectionItem, with the specified parent item.

	~QgsDataCollectionItem () override

void	addChild (QgsDataItem *item)

Public Member Functions inherited from QgsDataItem
	QgsDataItem (Qgis::BrowserItemType type, QgsDataItem *parent, const QString &name, const QString &path, const QString &providerKey=QString())
	Constructor for QgsDataItem, with the specified parent item.

	~QgsDataItem () override

virtual Q_DECL_DEPRECATED bool	acceptDrop ()
	Returns whether the item accepts drag and dropped layers - e.g.

virtual QList< QAction * >	actions (QWidget *parent)
	Returns the list of actions available for this item.

virtual void	addChildItem (QgsDataItem *child, bool refresh=false)
	Inserts a new child item.

virtual Qgis::BrowserItemCapabilities	capabilities2 () const
	Returns the capabilities for the data item.

QVector< QgsDataItem * >	children () const

virtual void	deleteChildItem (QgsDataItem *child)
	Removes and deletes a child item, emitting relevant signals to the model.

virtual bool	equal (const QgsDataItem *other)
	Returns `true` if this item is equal to another item (by testing item type and path).

virtual bool	handleDoubleClick ()
	Called when a user double clicks on the item.

virtual Q_DECL_DEPRECATED bool	handleDrop (const QMimeData *, Qt::DropAction)
	Attempts to process the mime data dropped on this item.

bool	hasChildren ()

virtual QIcon	icon ()

virtual bool	layerCollection () const
	Returns `true` if the data item is a collection of layers The default implementation returns `false`, subclasses must implement this method if their children are layers.

virtual QList< QMenu * >	menus (QWidget *parent)
	Returns the list of menus available for this item.

virtual Q_DECL_DEPRECATED QgsMimeDataUtils::Uri	mimeUri () const
	Returns mime URI for the data item.

void	moveToThread (QThread *targetThread)
	Move object and all its descendants to thread.

QString	name () const
	Returns the name of the item (the displayed text for the item).

virtual Q_DECL_DEPRECATED QWidget *	paramWidget ()
	Returns source widget from data item for QgsBrowserPropertiesWidget.

QgsDataItem *	parent () const
	Gets item parent.

QString	path () const

QString	providerKey () const
	Returns the provider key that created this item (e.g.

virtual QgsDataItem *	removeChildItem (QgsDataItem *child)
	Removes a child item and returns it without deleting it.

virtual Q_DECL_DEPRECATED bool	rename (const QString &name)
	Sets a new name for the item, and returns `true` if the item was successfully renamed.

int	rowCount ()

Q_DECL_DEPRECATED void	setCapabilities (int capabilities)

virtual void	setCapabilities (Qgis::BrowserItemCapabilities capabilities)
	Sets the capabilities for the data item.

virtual Q_DECL_DEPRECATED bool	setCrs (const QgsCoordinateReferenceSystem &crs)
	Writes the selected crs into data source.

void	setIcon (const QIcon &icon)

void	setIconName (const QString &iconName)

void	setName (const QString &name)
	Sets the name of the item (the displayed text for the item).

void	setParent (QgsDataItem *parent)
	Set item parent and connect / disconnect parent to / from item signals.

void	setPath (const QString &path)

void	setProviderKey (const QString &value)
	Sets the provider key that created this item (e.g.

void	setSortKey (const QVariant &key)
	Sets a custom sorting key for the item.

virtual void	setState (Qgis::BrowserItemState state)
	Set item state.

void	setToolTip (const QString &msg)

virtual QVariant	sortKey () const
	Returns the sorting key for the item.

Qgis::BrowserItemState	state () const

QString	toolTip () const

Qgis::BrowserItemType	type () const

Additional Inherited Members
Public Slots inherited from QgsDataItem
virtual void	childrenCreated ()

virtual void	deleteLater ()
	Safely delete the item:

virtual void	depopulate ()
	Remove children recursively and set as not populated. This is used when refreshing collapsed items.

virtual void	populate (bool foreground=false)

virtual void	refresh ()

virtual void	refreshConnections (const QString &providerKey=QString())
	Causes a data item provider to refresh all registered connections.

Signals inherited from QgsDataItem
void	beginInsertItems (QgsDataItem *parent, int first, int last)
	Emitted before child items are added to this data item.

void	beginRemoveItems (QgsDataItem *parent, int first, int last)
	Emitted before child items are removed from this data item.

void	connectionsChanged (const QString &providerKey=QString())
	Emitted when the connections of the provider with the specified providerKey have changed.

void	dataChanged (QgsDataItem *item)
	Emitted when data changes for an item.

void	endInsertItems ()
	Emitted after child items have been added to this data item.

void	endRemoveItems ()
	Emitted after child items have been removed from this data item.

void	stateChanged (QgsDataItem *item, Qgis::BrowserItemState oldState)
	Emitted when an item's state is changed.

Static Public Member Functions inherited from QgsDataCollectionItem
static QIcon	iconDataCollection ()
	Returns the standard browser data collection icon.

static QIcon	iconDir (const QColor &fillColor=QColor(), const QColor &strokeColor=QColor())
	Returns the standard browser directory icon.

Static Public Member Functions inherited from QgsDataItem
static void	deleteLater (QVector< QgsDataItem * > &items)

template<class T >
static QList< T * >	filteredItems (const QList< QgsDataItem * > &items)
	Returns a filtered list of data items which match the template type.

static int	findItem (QVector< QgsDataItem * > items, QgsDataItem *item)

static QString	pathComponent (const QString &component)
	Create path component replacing path separators.

Protected Slots inherited from QgsDataItem
void	updateIcon ()
	Will request a repaint of this icon.

Protected Member Functions inherited from QgsDataItem
bool	deferredDelete ()
	The item is scheduled to be deleted.

virtual void	populate (const QVector< QgsDataItem * > &children)

virtual void	refresh (const QVector< QgsDataItem * > &children)
	Refresh the items from a specified list of child items.

Static Protected Member Functions inherited from QgsDataCollectionItem
static QIcon	homeDirIcon (const QColor &fillColor=QColor(), const QColor &strokeColor=QColor())
	Shared home directory icon.

static QIcon	openDirIcon (const QColor &fillColor=QColor(), const QColor &strokeColor=QColor())
	Shared open directory icon.

Protected Attributes inherited from QgsDataItem
Qgis::BrowserItemCapabilities	mCapabilities = Qgis::BrowserItemCapability::NoCapabilities

QVector< QgsDataItem * >	mChildren

QIcon	mIcon

QMap< QString, QIcon >	mIconMap

QString	mIconName

QString	mName

QgsDataItem *	mParent = nullptr

QString	mPath

QString	mProviderKey

QVariant	mSortKey
	Custom sort key. If invalid, name() will be used for sorting instead.

Qgis::BrowserItemState	mState = Qgis::BrowserItemState::NotPopulated

QString	mToolTip

Qgis::BrowserItemType	mType

Detailed Description

A data collection item for file based data collections (e.g.

NetCDF files).

This is a generic data collection item, which is created by a QgsFileBasedDataItemProvider for datasets which may potentially contain multiple sublayers.

Since: QGIS 3.22

Definition at line 119 of file qgsfilebaseddataitemprovider.h.

Constructor & Destructor Documentation

◆ QgsFileDataCollectionItem()

QgsFileDataCollectionItem::QgsFileDataCollectionItem	(	QgsDataItem *	parent,
		const QString &	name,
		const QString &	path,
		const QList< QgsProviderSublayerDetails > &	sublayers,
		const QVariantMap &	extraUriParts = `QVariantMap()`
	)

Constructor for QgsFileDataCollectionItem.

Parameters

parent	parent item
name	data item name (this should usually match the filename of the dataset)
path	path to dataset
sublayers	list of sublayers to initially populate the item with. If the sublayer details are incomplete (see QgsProviderUtils::sublayerDetailsAreIncomplete()) then the item will be populated in a background thread when expanded.
extraUriParts	optional map of extra components to append to URIs generated for the path. The provider-specific encodeUri methods will be used to handle these URI additions. Since QGIS 3.40.

Definition at line 216 of file qgsfilebaseddataitemprovider.cpp.

Member Function Documentation

◆ canAddVectorLayers()

bool QgsFileDataCollectionItem::canAddVectorLayers ( ) const

Returns true if the file is likely to support addition of vector layers.

This method is designed to be cheap to evaluate, so that it is safe to call within the main thread.

By default it relies solely on a basic check of the associated driver's theoretical capabilities, and does not actually open the dataset to determine whether the particular file definitely can support layer additions.

If a connection has previously been opened for this item, then the results will be updated to use the actual capabilities determined by that connection.