The QgsLayerTreeModel class is model implementation for Qt item views framework. More...

#include <qgslayertreemodel.h>

Inheritance diagram for QgsLayerTreeModel:

Classes
struct	LayerLegendData
	Structure that stores all data associated with one map layer. More...

struct	LayerLegendTree
	Structure that stores tree representation of map layer's legend. More...

Public Types
enum	Flag { ShowLegend = 0x0001, ShowLegendAsTree = 0x0004, DeferredLegendInvalidation = 0x0008, UseEmbeddedWidgets = 0x0010, AllowNodeReorder = 0x1000, AllowNodeRename = 0x2000, AllowNodeChangeVisibility = 0x4000, AllowLegendChangeState = 0x8000, ActionHierarchical = 0x10000 }

Public Member Functions
	QgsLayerTreeModel (QgsLayerTree rootNode, QObject parent=nullptr)
	Construct a new tree model with given layer tree (root node must not be null pointer). More...

	~QgsLayerTreeModel () override

int	autoCollapseLegendNodes () const
	Returns at what number of legend nodes the layer node should be collapsed. -1 means no auto-collapse (default). More...

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

QModelIndex	currentIndex () const
	Gets index of the item marked as current. Item marked as current is underlined. More...

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

QgsLayerTreeModelLegendNode *	findLegendNode (const QString &layerId, const QString &ruleKey) const
	Searches through the layer tree to find a legend node with a matching layer ID and rule key. More...

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

Flags	flags () const
	Returns OR-ed combination of model flags. More...

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

QgsLayerTreeNode *	index2node (const QModelIndex &index) const
	Returns layer tree node for given index. More...

QList< QgsLayerTreeNode * >	indexes2nodes (const QModelIndexList &list, bool skipInternal=false) const
	Convert a list of indexes to a list of layer tree nodes. More...

QList< QgsLayerTreeModelLegendNode * >	layerLegendNodes (QgsLayerTreeLayer *nodeLayer, bool skipNodeEmbeddedInParent=false)
	Returns filtered list of active legend nodes attached to a particular layer node (by default it returns also legend node embedded in parent layer node (if any) unless skipNodeEmbeddedInParent is true) More...

QList< QgsLayerTreeModelLegendNode * >	layerOriginalLegendNodes (QgsLayerTreeLayer *nodeLayer)
	Returns original (unfiltered) list of legend nodes attached to a particular layer node. More...

QMap< QString, QString >	layerStyleOverrides () const
	Gets map of map layer style overrides (key: layer ID, value: style name) where a different style should be used instead of the current one. More...

QFont	layerTreeNodeFont (int nodeType) const
	Gets font for a particular type of layer tree node. nodeType should come from QgsLayerTreeNode::NodeType enumeration. More...

double	legendFilterByScale () const
	Returns the scale which restricts the legend nodes which are visible. More...

const QgsMapSettings *	legendFilterMapSettings () const
	Returns the current map settings used for the current legend filter (or null if none is enabled) More...

void	legendMapViewData (double mapUnitsPerPixel, int dpi, double *scale) const
	Gets hints about map view - to be used in legend nodes. More...

QModelIndex	legendNode2index (QgsLayerTreeModelLegendNode *legendNode)
	Returns index for a given legend node. More...

QgsLayerTreeModelLegendNode *	legendNodeEmbeddedInParent (QgsLayerTreeLayer *nodeLayer) const
	Returns legend node that may be embedded in parent (i.e. More...

QMimeData *	mimeData (const QModelIndexList &indexes) const override

QStringList	mimeTypes () const override

QModelIndex	node2index (QgsLayerTreeNode *node) const
	Returns index for a given node. If the node does not belong to the layer tree, the result is undefined. More...

QModelIndex	parent (const QModelIndex &child) const override

void	refreshLayerLegend (QgsLayerTreeLayer *nodeLayer)
	Force a refresh of legend nodes of a layer node. More...

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

QgsLayerTree *	rootGroup () const
	Returns pointer to the root node of the layer tree. Always a non-null pointer. More...

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

void	setAutoCollapseLegendNodes (int nodeCount)
	Sets at what number of legend nodes the layer node should be collapsed. Setting -1 disables the auto-collapse (default). More...

void	setCurrentIndex (const QModelIndex &currentIndex)
	Sets index of the current item. May be used by view. Item marked as current is underlined. More...

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

void	setFlag (Flag f, bool on=true)
	Enable or disable a model flag. More...

void	setFlags (QgsLayerTreeModel::Flags f)
	Sets OR-ed combination of model flags. More...

void	setLayerStyleOverrides (const QMap< QString, QString > &overrides)
	Sets map of map layer style overrides (key: layer ID, value: style name) where a different style should be used instead of the current one. More...

void	setLayerTreeNodeFont (int nodeType, const QFont &font)
	Sets font for a particular type of layer tree node. nodeType should come from QgsLayerTreeNode::NodeType enumeration. More...

void	setLegendFilter (const QgsMapSettings *settings, bool useExtent=true, const QgsGeometry &polygon=QgsGeometry(), bool useExpressions=true)
	Filter display of legend nodes for given map settings. More...

void	setLegendFilterByMap (const QgsMapSettings *settings)
	Force only display of legend nodes which are valid for given map settings. More...

void	setLegendFilterByScale (double scale)
	Force only display of legend nodes which are valid for a given scale. More...

void	setLegendMapViewData (double mapUnitsPerPixel, int dpi, double scale)
	Give the layer tree model hints about the currently associated map view so that legend nodes that use map units can be scaled currectly. More...

void	setRootGroup (QgsLayerTree *newRootGroup)
	Reset the model and use a new root group node. More...

Qt::DropActions	supportedDropActions () const override

bool	testFlag (Flag f) const
	Check whether a flag is enabled. More...

Static Public Member Functions
static QgsLayerTreeModelLegendNode *	index2legendNode (const QModelIndex &index)
	Returns legend node for given index. More...

static int	scaleIconSize (int standardSize)
	Scales an layer tree model icon size to compensate for display pixel density, making the icon size hi-dpi friendly, whilst still resulting in pixel-perfect sizes for low-dpi displays. More...

Protected Slots
void	invalidateLegendMapBasedData ()

void	layerLegendChanged ()

void	layerNeedsUpdate ()

void	legendNodeDataChanged ()

void	nodeAddedChildren (QgsLayerTreeNode *node, int indexFrom, int indexTo)

void	nodeCustomPropertyChanged (QgsLayerTreeNode *node, const QString &key)

void	nodeLayerLoaded ()

void	nodeLayerWillBeUnloaded ()

void	nodeNameChanged (QgsLayerTreeNode *node, const QString &name)
	Updates model when node's name has changed. More...

void	nodeRemovedChildren ()

void	nodeVisibilityChanged (QgsLayerTreeNode *node)

void	nodeWillAddChildren (QgsLayerTreeNode *node, int indexFrom, int indexTo)

void	nodeWillRemoveChildren (QgsLayerTreeNode *node, int indexFrom, int indexTo)

Protected Member Functions
void	addLegendToLayer (QgsLayerTreeLayer *nodeL)

void	connectToLayer (QgsLayerTreeLayer *nodeLayer)

void	connectToLayers (QgsLayerTreeGroup *parentGroup)

void	connectToRootNode ()

void	disconnectFromLayer (QgsLayerTreeLayer *nodeLayer)

void	disconnectFromLayers (QgsLayerTreeGroup *parentGroup)

void	disconnectFromRootNode ()

QList< QgsLayerTreeModelLegendNode * >	filterLegendNodes (const QList< QgsLayerTreeModelLegendNode * > &nodes)
	Filter nodes from QgsMapLayerLegend according to the current filtering rules. More...

QModelIndex	indexOfParentLayerTreeNode (QgsLayerTreeNode *parentNode) const

void	legendCleanup ()

bool	legendEmbeddedInParent (QgsLayerTreeLayer *nodeLayer) const

QIcon	legendIconEmbeddedInParent (QgsLayerTreeLayer *nodeLayer) const

void	legendInvalidateMapBasedData ()

QVariant	legendNodeData (QgsLayerTreeModelLegendNode *node, int role) const

Qt::ItemFlags	legendNodeFlags (QgsLayerTreeModelLegendNode *node) const

QModelIndex	legendNodeIndex (int row, int column, QgsLayerTreeModelLegendNode *node) const

int	legendNodeRowCount (QgsLayerTreeModelLegendNode *node) const

QModelIndex	legendParent (QgsLayerTreeModelLegendNode *legendNode) const

QModelIndex	legendRootIndex (int row, int column, QgsLayerTreeLayer *nL) const

int	legendRootRowCount (QgsLayerTreeLayer *nL) const

void	recursivelyEmitDataChanged (const QModelIndex &index=QModelIndex())
	emit dataChanged() for layer tree node items More...

void	refreshScaleBasedLayers (const QModelIndex &index=QModelIndex())
	Updates layer data for scale dependent layers, should be called when map scale changes. More...

void	removeLegendFromLayer (QgsLayerTreeLayer *nodeLayer)

LayerLegendTree *	tryBuildLegendTree (const QList< QgsLayerTreeModelLegendNode * > &nodes)

Static Protected Member Functions
static QIcon	iconGroup ()

Protected Attributes
int	mAutoCollapseLegendNodesCount
	Minimal number of nodes when legend should be automatically collapsed. -1 = disabled. More...

QPersistentModelIndex	mCurrentIndex
	Current index - will be underlined. More...

QTimer	mDeferLegendInvalidationTimer

Flags	mFlags
	Sets of flags for the model. More...

QFont	mFontGroup

QFont	mFontLayer

QMap< QString, QString >	mLayerStyleOverrides
	Overrides of map layers' styles: key = layer ID, value = style XML. More...

QMap< QgsLayerTreeLayer *, LayerLegendData >	mLegend
	Per layer data about layer's legend nodes. More...

double	mLegendFilterByScale
	scale denominator for filtering of legend nodes (<= 0 means no filtering) More...

std::unique_ptr< QgsMapHitTest >	mLegendFilterHitTest

std::unique_ptr< QgsMapSettings >	mLegendFilterMapSettings

bool	mLegendFilterUsesExtent
	whether to use map filtering More...

int	mLegendMapViewDpi

double	mLegendMapViewMupp

double	mLegendMapViewScale

QgsLayerTree *	mRootNode = nullptr
	Pointer to the root node of the layer tree. Not owned by the model. More...

Detailed Description

The QgsLayerTreeModel class is model implementation for Qt item views framework.

The model can be used in any QTreeView, it is however recommended to use it with QgsLayerTreeView which brings additional functionality specific to layer tree handling.

The model listens to the changes in the layer tree and signals the changes as appropriate, so that any view that uses the model is updated accordingly.

Behavior of the model can be customized with flags. For example, whether to show legend or whether to allow changes to the layer tree.

See also: QgsLayerTreeView

Since: QGIS 2.4

Definition at line 53 of file qgslayertreemodel.h.

Member Enumeration Documentation

enum QgsLayerTreeModel::Flag

Enumerator
ShowLegend	Add legend nodes for layer nodes.
ShowLegendAsTree	For legends that support it, will show them in a tree instead of a list (needs also ShowLegend). Added in 2.8.
DeferredLegendInvalidation	Defer legend model invalidation.
UseEmbeddedWidgets	Layer nodes may optionally include extra embedded widgets (if used in QgsLayerTreeView). Added in 2.16.
AllowNodeReorder	Allow reordering with drag'n'drop.
AllowNodeRename	Allow renaming of groups and layers.
AllowNodeChangeVisibility	Allow user to set node visibility with a checkbox.
AllowLegendChangeState	Allow check boxes for legend nodes (if supported by layer's legend)
ActionHierarchical	Check/uncheck action has consequences on children (or parents for leaf node)

Definition at line 93 of file qgslayertreemodel.h.

Constructor & Destructor Documentation

QgsLayerTreeModel::QgsLayerTreeModel	(	QgsLayerTree *	rootNode,
		QObject *	parent = `nullptr`
	)

explicit

Construct a new tree model with given layer tree (root node must not be null pointer).

The root node is not transferred by the model.

Definition at line 37 of file qgslayertreemodel.cpp.

QgsLayerTreeModel::~QgsLayerTreeModel ( )

override

Definition at line 56 of file qgslayertreemodel.cpp.

Member Function Documentation

void QgsLayerTreeModel::addLegendToLayer ( QgsLayerTreeLayer * nodeL )

protected

Definition at line 1208 of file qgslayertreemodel.cpp.

int QgsLayerTreeModel::autoCollapseLegendNodes ( ) const

inline

Returns at what number of legend nodes the layer node should be collapsed. -1 means no auto-collapse (default).

Definition at line 207 of file qgslayertreemodel.h.

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

override

Definition at line 91 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::connectToLayer ( QgsLayerTreeLayer * nodeLayer )

protected

Definition at line 853 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::connectToLayers ( QgsLayerTreeGroup * parentGroup )

protected

Definition at line 931 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::connectToRootNode ( )

protected

Definition at line 953 of file qgslayertreemodel.cpp.

QModelIndex QgsLayerTreeModel::currentIndex ( ) const

Gets index of the item marked as current. Item marked as current is underlined.

Definition at line 548 of file qgslayertreemodel.cpp.

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

override

Definition at line 156 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::disconnectFromLayer ( QgsLayerTreeLayer * nodeLayer )

protected

Definition at line 912 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::disconnectFromLayers ( QgsLayerTreeGroup * parentGroup )

protected

Definition at line 942 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::disconnectFromRootNode ( )

protected

Definition at line 969 of file qgslayertreemodel.cpp.

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

override

Definition at line 1049 of file qgslayertreemodel.cpp.

QList< QgsLayerTreeModelLegendNode * > QgsLayerTreeModel::filterLegendNodes ( const QList< QgsLayerTreeModelLegendNode * > & nodes )

protected

Filter nodes from QgsMapLayerLegend according to the current filtering rules.

Definition at line 1136 of file qgslayertreemodel.cpp.

QgsLayerTreeModelLegendNode * QgsLayerTreeModel::findLegendNode	(	const QString &	layerId,
		const QString &	ruleKey
	)		const

Searches through the layer tree to find a legend node with a matching layer ID and rule key.

Parameters

layerId	map layer ID
ruleKey	legend node rule key

Returns: QgsLayerTreeModelLegendNode if found

Since: QGIS 2.14

Definition at line 1497 of file qgslayertreemodel.cpp.

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

override

Definition at line 345 of file qgslayertreemodel.cpp.

QgsLayerTreeModel::Flags QgsLayerTreeModel::flags ( ) const

Returns OR-ed combination of model flags.

Definition at line 1121 of file qgslayertreemodel.cpp.

QIcon QgsLayerTreeModel::iconGroup ( )

staticprotected

Definition at line 1131 of file qgslayertreemodel.cpp.

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

override

Definition at line 97 of file qgslayertreemodel.cpp.

QgsLayerTreeModelLegendNode * QgsLayerTreeModel::index2legendNode ( const QModelIndex & index )

static

Returns legend node for given index.

Returns null for invalid index

Since: QGIS 2.6

Definition at line 1343 of file qgslayertreemodel.cpp.

QgsLayerTreeNode * QgsLayerTreeModel::index2node ( const QModelIndex & index ) const

Returns layer tree node for given index.

Returns root node for invalid index. Returns null pointer if index does not refer to a layer tree node (e.g. it is a legend node)

Definition at line 61 of file qgslayertreemodel.cpp.

QList< QgsLayerTreeNode * > QgsLayerTreeModel::indexes2nodes	(	const QModelIndexList &	list,
		bool	skipInternal = `false`
	)		const

Convert a list of indexes to a list of layer tree nodes.

Indices that do not represent layer tree nodes are skipped. If skipInternal is true, a node is included in the output list only if no parent node is in the list.

Definition at line 482 of file qgslayertreemodel.cpp.

QModelIndex QgsLayerTreeModel::indexOfParentLayerTreeNode ( QgsLayerTreeNode * parentNode ) const

protected

Definition at line 141 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::invalidateLegendMapBasedData ( )

protectedslot

Definition at line 1527 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::layerLegendChanged ( )

protectedslot

Definition at line 804 of file qgslayertreemodel.cpp.

QList< QgsLayerTreeModelLegendNode * > QgsLayerTreeModel::layerLegendNodes	(	QgsLayerTreeLayer *	nodeLayer,
		bool	skipNodeEmbeddedInParent = `false`
	)

Returns filtered list of active legend nodes attached to a particular layer node (by default it returns also legend node embedded in parent layer node (if any) unless skipNodeEmbeddedInParent is true)

Note: Parameter skipNodeEmbeddedInParent added in QGIS 2.18

See also: layerOriginalLegendNodes()

Since: QGIS 2.6

Definition at line 1480 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::layerNeedsUpdate ( )

protectedslot

Definition at line 823 of file qgslayertreemodel.cpp.

QList< QgsLayerTreeModelLegendNode * > QgsLayerTreeModel::layerOriginalLegendNodes ( QgsLayerTreeLayer * nodeLayer )

Returns original (unfiltered) list of legend nodes attached to a particular layer node.

See also: layerLegendNodes()

Since: QGIS 2.14

Definition at line 1492 of file qgslayertreemodel.cpp.

QMap< QString, QString > QgsLayerTreeModel::layerStyleOverrides ( ) const

Gets map of map layer style overrides (key: layer ID, value: style name) where a different style should be used instead of the current one.

Since: QGIS 2.10

Definition at line 693 of file qgslayertreemodel.cpp.

QFont QgsLayerTreeModel::layerTreeNodeFont ( int nodeType ) const

Gets font for a particular type of layer tree node. nodeType should come from QgsLayerTreeNode::NodeType enumeration.

Definition at line 590 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::legendCleanup ( )

protected

Definition at line 1186 of file qgslayertreemodel.cpp.

bool QgsLayerTreeModel::legendEmbeddedInParent ( QgsLayerTreeLayer * nodeLayer ) const

protected

Definition at line 1460 of file qgslayertreemodel.cpp.

double QgsLayerTreeModel::legendFilterByScale ( ) const

inline

Returns the scale which restricts the legend nodes which are visible.

The scale value indicates the scale denominator, e.g. 1000.0 for a 1:1000 map. A scale <= 0 indicates that no scale filtering is being performed.

See also: setLegendFilterByScale()

Since: QGIS 2.6

Definition at line 225 of file qgslayertreemodel.h.

const QgsMapSettings* QgsLayerTreeModel::legendFilterMapSettings ( ) const

inline

Returns the current map settings used for the current legend filter (or null if none is enabled)

Since: QGIS 2.14

Definition at line 249 of file qgslayertreemodel.h.

QIcon QgsLayerTreeModel::legendIconEmbeddedInParent ( QgsLayerTreeLayer * nodeLayer ) const

protected

Definition at line 1471 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::legendInvalidateMapBasedData ( )

protected

Definition at line 1519 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::legendMapViewData	(	double *	mapUnitsPerPixel,
		int *	dpi,
		double *	scale
	)		const

Gets hints about map view - to be used in legend nodes.

Arguments that are not null will receive values. If there are no valid map view data (from previous call to setLegendMapViewData()), returned values are zeros.

Since: QGIS 2.6

Definition at line 686 of file qgslayertreemodel.cpp.

QModelIndex QgsLayerTreeModel::legendNode2index ( QgsLayerTreeModelLegendNode * legendNode )

Returns index for a given legend node.

If the legend node does not belong to the layer tree, the result is undefined. If the legend node is belongs to the tree but it is filtered out, invalid model index is returned.

Since: QGIS 2.6

Definition at line 1349 of file qgslayertreemodel.cpp.

QVariant QgsLayerTreeModel::legendNodeData	(	QgsLayerTreeModelLegendNode *	node,
		int	role
	)		const

protected

Definition at line 1443 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::legendNodeDataChanged ( )

protectedslot

Definition at line 841 of file qgslayertreemodel.cpp.

QgsLayerTreeModelLegendNode * QgsLayerTreeModel::legendNodeEmbeddedInParent ( QgsLayerTreeLayer * nodeLayer ) const

Returns legend node that may be embedded in parent (i.e.

its icon will be used for layer's icon).

Since: QGIS 2.18

Definition at line 1465 of file qgslayertreemodel.cpp.

Qt::ItemFlags QgsLayerTreeModel::legendNodeFlags ( QgsLayerTreeModelLegendNode * node ) const

protected

Definition at line 1451 of file qgslayertreemodel.cpp.

QModelIndex QgsLayerTreeModel::legendNodeIndex	(	int	row,
		int	column,
		QgsLayerTreeModelLegendNode *	node
	)		const

protected

Definition at line 1413 of file qgslayertreemodel.cpp.

int QgsLayerTreeModel::legendNodeRowCount ( QgsLayerTreeModelLegendNode * node ) const

protected

Definition at line 1378 of file qgslayertreemodel.cpp.

QModelIndex QgsLayerTreeModel::legendParent ( QgsLayerTreeModelLegendNode * legendNode ) const

protected

Definition at line 1423 of file qgslayertreemodel.cpp.

QModelIndex QgsLayerTreeModel::legendRootIndex	(	int	row,
		int	column,
		QgsLayerTreeLayer *	nL
	)		const

protected

Definition at line 1402 of file qgslayertreemodel.cpp.

int QgsLayerTreeModel::legendRootRowCount ( QgsLayerTreeLayer * nL ) const

protected

Definition at line 1388 of file qgslayertreemodel.cpp.

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

override

Definition at line 1022 of file qgslayertreemodel.cpp.

QStringList QgsLayerTreeModel::mimeTypes ( ) const

override

Definition at line 1014 of file qgslayertreemodel.cpp.

QModelIndex QgsLayerTreeModel::node2index ( QgsLayerTreeNode * node ) const

Returns index for a given node. If the node does not belong to the layer tree, the result is undefined.

Definition at line 446 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::nodeAddedChildren	(	QgsLayerTreeNode *	node,
		int	indexFrom,
		int	indexTo
	)

protectedslot

Definition at line 731 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::nodeCustomPropertyChanged	(	QgsLayerTreeNode *	node,
		const QString &	key
	)

protectedslot

Definition at line 775 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::nodeLayerLoaded ( )

protectedslot

Definition at line 782 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::nodeLayerWillBeUnloaded ( )

protectedslot

Definition at line 792 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::nodeNameChanged	(	QgsLayerTreeNode *	node,
		const QString &	name
	)

protectedslot

Updates model when node's name has changed.

Since: QGIS 3.0

Definition at line 765 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::nodeRemovedChildren ( )

protectedslot

Definition at line 752 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::nodeVisibilityChanged ( QgsLayerTreeNode * node )

protectedslot

Definition at line 757 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::nodeWillAddChildren	(	QgsLayerTreeNode *	node,
		int	indexFrom,
		int	indexTo
	)

protectedslot

Definition at line 710 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::nodeWillRemoveChildren	(	QgsLayerTreeNode *	node,
		int	indexFrom,
		int	indexTo
	)

protectedslot

Definition at line 741 of file qgslayertreemodel.cpp.

QModelIndex QgsLayerTreeModel::parent ( const QModelIndex & child ) const

override

Definition at line 119 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::recursivelyEmitDataChanged ( const QModelIndex & index = QModelIndex() )

protected

emit dataChanged() for layer tree node items

Definition at line 976 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::refreshLayerLegend ( QgsLayerTreeLayer * nodeLayer )

Force a refresh of legend nodes of a layer node.

Not necessary to call when layer's renderer is changed as the model listens to these events.

Definition at line 528 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::refreshScaleBasedLayers ( const QModelIndex & index = QModelIndex() )

protected

Updates layer data for scale dependent layers, should be called when map scale changes.

Emits dataChanged() for all scale dependent layers.

Since: QGIS 2.16

Definition at line 990 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::removeLegendFromLayer ( QgsLayerTreeLayer * nodeLayer )

protected

Definition at line 1197 of file qgslayertreemodel.cpp.

bool QgsLayerTreeModel::removeRows	(	int	row,
		int	count,
		const QModelIndex &	parent = `QModelIndex()`
	)

override

Definition at line 1097 of file qgslayertreemodel.cpp.

QgsLayerTree * QgsLayerTreeModel::rootGroup ( ) const

Returns pointer to the root node of the layer tree. Always a non-null pointer.

Definition at line 508 of file qgslayertreemodel.cpp.

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

override

Definition at line 71 of file qgslayertreemodel.cpp.

int QgsLayerTreeModel::scaleIconSize ( int standardSize )

static

Scales an layer tree model icon size to compensate for display pixel density, making the icon size hi-dpi friendly, whilst still resulting in pixel-perfect sizes for low-dpi displays.

standardSize should be set to a standard icon size, e.g. 16, 24, 48, etc.

Since: QGIS 3.6

Definition at line 703 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::setAutoCollapseLegendNodes ( int nodeCount )

inline

Sets at what number of legend nodes the layer node should be collapsed. Setting -1 disables the auto-collapse (default).

Definition at line 205 of file qgslayertreemodel.h.

void QgsLayerTreeModel::setCurrentIndex ( const QModelIndex & currentIndex )

Sets index of the current item. May be used by view. Item marked as current is underlined.

Definition at line 553 of file qgslayertreemodel.cpp.

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

override

Definition at line 382 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::setFlag	(	QgsLayerTreeModel::Flag	f,
		bool	on = `true`
	)

Enable or disable a model flag.

Definition at line 1113 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::setFlags ( QgsLayerTreeModel::Flags f )

Sets OR-ed combination of model flags.

Definition at line 1108 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::setLayerStyleOverrides ( const QMap< QString, QString > & overrides )

Sets map of map layer style overrides (key: layer ID, value: style name) where a different style should be used instead of the current one.

Since: QGIS 2.10

Definition at line 698 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::setLayerTreeNodeFont	(	int	nodeType,
		const QFont &	font
	)

Sets font for a particular type of layer tree node. nodeType should come from QgsLayerTreeNode::NodeType enumeration.

Definition at line 565 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::setLegendFilter	(	const QgsMapSettings *	settings,
		bool	useExtent = `true`,
		const QgsGeometry &	polygon = `QgsGeometry()`,
		bool	useExpressions = `true`
	)

Filter display of legend nodes for given map settings.

Parameters

settings	Map settings. Setting a null pointer or invalid settings will disable any filter. Ownership is not changed, a copy is made
useExtent	Whether to use the extent of the map settings as a first spatial filter on legend nodes
polygon	If not empty, this polygon will be used instead of the map extent to filter legend nodes
useExpressions	Whether to use legend node filter expressions

Since: QGIS 2.14

Definition at line 618 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::setLegendFilterByMap ( const QgsMapSettings * settings )

Force only display of legend nodes which are valid for given map settings.

Setting null pointer or invalid map settings will disable the functionality. Ownership of map settings pointer does not change, a copy is made.

Since: QGIS 2.6

Definition at line 613 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::setLegendFilterByScale ( double scale )

Force only display of legend nodes which are valid for a given scale.

The scale value indicates the scale denominator, e.g. 1000.0 for a 1:1000 map. Setting scale <= 0 will disable the functionality.

See also: legendFilterByScale()

Since: QGIS 2.6

Definition at line 603 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::setLegendMapViewData	(	double	mapUnitsPerPixel,
		int	dpi,
		double	scale
	)

Give the layer tree model hints about the currently associated map view so that legend nodes that use map units can be scaled currectly.

Since: QGIS 2.6

Definition at line 671 of file qgslayertreemodel.cpp.

void QgsLayerTreeModel::setRootGroup ( QgsLayerTree * newRootGroup )

Reset the model and use a new root group node.

Since: QGIS 2.6

Definition at line 513 of file qgslayertreemodel.cpp.

Qt::DropActions QgsLayerTreeModel::supportedDropActions ( ) const

override

Definition at line 1009 of file qgslayertreemodel.cpp.

bool QgsLayerTreeModel::testFlag ( QgsLayerTreeModel::Flag f ) const

Check whether a flag is enabled.

Definition at line 1126 of file qgslayertreemodel.cpp.

QgsLayerTreeModel::LayerLegendTree * QgsLayerTreeModel::tryBuildLegendTree ( const QList< QgsLayerTreeModelLegendNode * > & nodes )

protected

Note: not available in Python bindings

Definition at line 1286 of file qgslayertreemodel.cpp.

Member Data Documentation

int QgsLayerTreeModel::mAutoCollapseLegendNodesCount

protected

Minimal number of nodes when legend should be automatically collapsed. -1 = disabled.

Definition at line 363 of file qgslayertreemodel.h.

QPersistentModelIndex QgsLayerTreeModel::mCurrentIndex

protected

Current index - will be underlined.

Definition at line 361 of file qgslayertreemodel.h.

QTimer QgsLayerTreeModel::mDeferLegendInvalidationTimer

protected

Definition at line 442 of file qgslayertreemodel.h.

Flags QgsLayerTreeModel::mFlags

protected

Sets of flags for the model.

Definition at line 359 of file qgslayertreemodel.h.

QFont QgsLayerTreeModel::mFontGroup

protected

Definition at line 428 of file qgslayertreemodel.h.

QFont QgsLayerTreeModel::mFontLayer

protected

Definition at line 427 of file qgslayertreemodel.h.

QMap<QString, QString> QgsLayerTreeModel::mLayerStyleOverrides

protected

Overrides of map layers' styles: key = layer ID, value = style XML.

This allows showing a legend that is different from the current style of layers

Definition at line 422 of file qgslayertreemodel.h.

QMap<QgsLayerTreeLayer *, LayerLegendData> QgsLayerTreeModel::mLegend

protected

Per layer data about layer's legend nodes.

Definition at line 425 of file qgslayertreemodel.h.

double QgsLayerTreeModel::mLegendFilterByScale

protected

scale denominator for filtering of legend nodes (<= 0 means no filtering)

Definition at line 431 of file qgslayertreemodel.h.

std::unique_ptr<QgsMapHitTest> QgsLayerTreeModel::mLegendFilterHitTest

protected

Definition at line 434 of file qgslayertreemodel.h.

std::unique_ptr<QgsMapSettings> QgsLayerTreeModel::mLegendFilterMapSettings

protected

Definition at line 433 of file qgslayertreemodel.h.

bool QgsLayerTreeModel::mLegendFilterUsesExtent

protected

whether to use map filtering

Definition at line 437 of file qgslayertreemodel.h.

int QgsLayerTreeModel::mLegendMapViewDpi

protected

Definition at line 440 of file qgslayertreemodel.h.

double QgsLayerTreeModel::mLegendMapViewMupp

protected

Definition at line 439 of file qgslayertreemodel.h.

double QgsLayerTreeModel::mLegendMapViewScale

protected

Definition at line 441 of file qgslayertreemodel.h.

QgsLayerTree* QgsLayerTreeModel::mRootNode = nullptr

protected

Pointer to the root node of the layer tree. Not owned by the model.

Definition at line 357 of file qgslayertreemodel.h.

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

/build/qgis-3.4.15+24xenial/src/core/layertree/qgslayertreemodel.h
/build/qgis-3.4.15+24xenial/src/core/layertree/qgslayertreemodel.cpp

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