Item model implementation based on layer tree model for layout legend. More...

#include <qgslayoutitemlegend.h>

Inheritance diagram for QgsLegendModel:

Signals
void	refreshLegend ()
	Emitted to refresh the legend. More...

Signals inherited from QgsLayerTreeModel
void	messageEmitted (const QString &message, Qgis::MessageLevel level=Qgis::MessageLevel::Info, int duration=5)
	Emits a message than can be displayed to the user in a GUI class. More...

Public Member Functions
	QgsLegendModel (QgsLayerTree rootNode, QgsLayoutItemLegend layout)
	Alternative constructor. More...

	QgsLegendModel (QgsLayerTree rootNode, QObject parent=nullptr, QgsLayoutItemLegend *layout=nullptr)
	Construct the model based on the given layer tree. More...

void	clearCachedData (QgsLayerTreeNode *node) const
	Clears any previously cached data for the specified node. More...

QVariant	data (const QModelIndex &index, int role) const override

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

QList< QgsLayerTreeModelLegendNode * >	layerLegendNodes (QgsLayerTreeLayer *nodeLayer, bool skipNodeEmbeddedInParent=false) const
	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...

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

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

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

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 `nullptr` 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 `nullptr` value. 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 correctly. 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...

Additional Inherited Members
Public Types inherited from QgsLayerTreeModel
enum	Flag { ShowLegend = 0x0001 , ShowLegendAsTree = 0x0004 , DeferredLegendInvalidation = 0x0008 , UseEmbeddedWidgets = 0x0010 , UseTextFormatting = 0x0020 , AllowNodeReorder = 0x1000 , AllowNodeRename = 0x2000 , AllowNodeChangeVisibility = 0x4000 , AllowLegendChangeState = 0x8000 , ActionHierarchical = 0x10000 }

Static Public Member Functions inherited from QgsLayerTreeModel
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 inherited from QgsLayerTreeModel
void	invalidateLegendMapBasedData ()

void	layerFlagsChanged ()
	Emitted when layer flags have changed. More...

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 inherited from QgsLayerTreeModel
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(), double previousScale=0.0)
	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 inherited from QgsLayerTreeModel
static QIcon	iconGroup ()

Protected Attributes inherited from QgsLayerTreeModel
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

QSet< QgsLayerTreeLayer * >	mInvalidatedNodes
	Keep track of layer nodes for which the legend size needs to be recalculated. More...

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

QHash< 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

Item model implementation based on layer tree model for layout legend.

Overrides some functionality of QgsLayerTreeModel to better fit the needs of layout legends.

Since: QGIS 2.6

Definition at line 43 of file qgslayoutitemlegend.h.

Constructor & Destructor Documentation

◆ QgsLegendModel() [1/2]

QgsLegendModel::QgsLegendModel	(	QgsLayerTree *	rootNode,
		QObject *	parent = `nullptr`,
		QgsLayoutItemLegend *	layout = `nullptr`
	)

Construct the model based on the given layer tree.

Definition at line 1064 of file qgslayoutitemlegend.cpp.

◆ QgsLegendModel() [2/2]

QgsLegendModel::QgsLegendModel	(	QgsLayerTree *	rootNode,
		QgsLayoutItemLegend *	layout
	)

Alternative constructor.

Definition at line 1072 of file qgslayoutitemlegend.cpp.

Member Function Documentation

◆ clearCachedData()

void QgsLegendModel::clearCachedData ( QgsLayerTreeNode * node ) const

Clears any previously cached data for the specified node.

Since: QGIS 3.14

Definition at line 1165 of file qgslayoutitemlegend.cpp.

◆ data()

QVariant QgsLegendModel::data	(	const QModelIndex &	index,
		int	role
	)		const

override

Definition at line 1080 of file qgslayoutitemlegend.cpp.

◆ flags()

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

override

Definition at line 1144 of file qgslayoutitemlegend.cpp.

◆ layerLegendNodes()

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

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; Not available in Python bindings

See also: layerOriginalLegendNodes()

Since: QGIS 3.10

Definition at line 1153 of file qgslayoutitemlegend.cpp.

◆ refreshLegend

void QgsLegendModel::refreshLegend ( )

signal

Emitted to refresh the legend.

Since: QGIS 3.10

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

/build/qgis-3.20.0+99unstable/src/core/layout/qgslayoutitemlegend.h
/build/qgis-3.20.0+99unstable/src/core/layout/qgslayoutitemlegend.cpp

Signals

Public Member Functions

Additional Inherited Members