QGIS API Documentation  3.17.0-Master (7a14973234)
Classes | Public Types | Signals | Public Member Functions | Static Public Member Functions | Protected Slots | Protected Member Functions | Static Protected Member Functions | Protected Attributes | List of all members
QgsLayerTreeModel Class Reference

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

#include <qgslayertreemodel.h>

Inheritance diagram for QgsLayerTreeModel:
Inheritance graph
[legend]

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,
  UseTextFormatting = 0x0020, AllowNodeReorder = 0x1000, AllowNodeRename = 0x2000, AllowNodeChangeVisibility = 0x4000,
  AllowLegendChangeState = 0x8000, ActionHierarchical = 0x10000
}
 

Signals

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

Public Member Functions

 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
 
QgsLayerTreeModelLegendNodefindLegendNode (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
 
QgsLayerTreeNodeindex2node (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 QgsMapSettingslegendFilterMapSettings () 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...
 
QgsLayerTreeModelLegendNodelegendNodeEmbeddedInParent (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
 
QgsLayerTreerootGroup () 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...
 

Static Public Member Functions

static QgsLayerTreeModelLegendNodeindex2legendNode (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(), double previousScale=0.0)
 Updates layer data for scale dependent layers, should be called when map scale changes. More...
 
void removeLegendFromLayer (QgsLayerTreeLayer *nodeLayer)
 
LayerLegendTreetryBuildLegendTree (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
 
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 *, LayerLegendDatamLegend
 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< QgsMapHitTestmLegendFilterHitTest
 
std::unique_ptr< QgsMapSettingsmLegendFilterMapSettings
 
bool mLegendFilterUsesExtent
 whether to use map filtering More...
 
int mLegendMapViewDpi
 
double mLegendMapViewMupp
 
double mLegendMapViewScale
 
QgsLayerTreemRootNode = 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

◆ 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.

UseTextFormatting 

Layer nodes will alter text appearance based on layer properties, such as scale based visibility.

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

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

The root node is not transferred by the model.

Definition at line 39 of file qgslayertreemodel.cpp.

◆ ~QgsLayerTreeModel()

QgsLayerTreeModel::~QgsLayerTreeModel ( )
override

Definition at line 58 of file qgslayertreemodel.cpp.

Member Function Documentation

◆ addLegendToLayer()

void QgsLayerTreeModel::addLegendToLayer ( QgsLayerTreeLayer nodeL)
protected

Definition at line 1271 of file qgslayertreemodel.cpp.

◆ autoCollapseLegendNodes()

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 208 of file qgslayertreemodel.h.

◆ columnCount()

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

Definition at line 93 of file qgslayertreemodel.cpp.

◆ connectToLayer()

void QgsLayerTreeModel::connectToLayer ( QgsLayerTreeLayer nodeLayer)
protected

Definition at line 883 of file qgslayertreemodel.cpp.

◆ connectToLayers()

void QgsLayerTreeModel::connectToLayers ( QgsLayerTreeGroup parentGroup)
protected

Definition at line 962 of file qgslayertreemodel.cpp.

◆ connectToRootNode()

void QgsLayerTreeModel::connectToRootNode ( )
protected

Definition at line 986 of file qgslayertreemodel.cpp.

◆ currentIndex()

QModelIndex QgsLayerTreeModel::currentIndex ( ) const

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

Definition at line 562 of file qgslayertreemodel.cpp.

◆ data()

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

Definition at line 158 of file qgslayertreemodel.cpp.

◆ disconnectFromLayer()

void QgsLayerTreeModel::disconnectFromLayer ( QgsLayerTreeLayer nodeLayer)
protected

Definition at line 943 of file qgslayertreemodel.cpp.

◆ disconnectFromLayers()

void QgsLayerTreeModel::disconnectFromLayers ( QgsLayerTreeGroup parentGroup)
protected

Definition at line 974 of file qgslayertreemodel.cpp.

◆ disconnectFromRootNode()

void QgsLayerTreeModel::disconnectFromRootNode ( )
protected

Definition at line 1002 of file qgslayertreemodel.cpp.

◆ dropMimeData()

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

Definition at line 1093 of file qgslayertreemodel.cpp.

◆ filterLegendNodes()

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

Filter nodes from QgsMapLayerLegend according to the current filtering rules.

Definition at line 1198 of file qgslayertreemodel.cpp.

◆ findLegendNode()

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
layerIdmap layer ID
ruleKeylegend node rule key
Returns
QgsLayerTreeModelLegendNode if found
Since
QGIS 2.14

Definition at line 1567 of file qgslayertreemodel.cpp.

◆ flags() [1/2]

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

Definition at line 355 of file qgslayertreemodel.cpp.

◆ flags() [2/2]

QgsLayerTreeModel::Flags QgsLayerTreeModel::flags ( ) const

Returns OR-ed combination of model flags.

Definition at line 1183 of file qgslayertreemodel.cpp.

◆ iconGroup()

QIcon QgsLayerTreeModel::iconGroup ( )
staticprotected

Definition at line 1193 of file qgslayertreemodel.cpp.

◆ index()

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

Definition at line 99 of file qgslayertreemodel.cpp.

◆ index2legendNode()

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

Returns legend node for given index.

Returns nullptr for invalid index

Since
QGIS 2.6

Definition at line 1413 of file qgslayertreemodel.cpp.

◆ index2node()

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

Returns layer tree node for given index.

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

Definition at line 63 of file qgslayertreemodel.cpp.

◆ indexes2nodes()

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 492 of file qgslayertreemodel.cpp.

◆ indexOfParentLayerTreeNode()

QModelIndex QgsLayerTreeModel::indexOfParentLayerTreeNode ( QgsLayerTreeNode parentNode) const
protected

Definition at line 143 of file qgslayertreemodel.cpp.

◆ invalidateLegendMapBasedData

void QgsLayerTreeModel::invalidateLegendMapBasedData ( )
protectedslot

Definition at line 1597 of file qgslayertreemodel.cpp.

◆ layerLegendChanged

void QgsLayerTreeModel::layerLegendChanged ( )
protectedslot

Definition at line 823 of file qgslayertreemodel.cpp.

◆ layerLegendNodes()

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 1550 of file qgslayertreemodel.cpp.

◆ layerNeedsUpdate

void QgsLayerTreeModel::layerNeedsUpdate ( )
protectedslot

Definition at line 842 of file qgslayertreemodel.cpp.

◆ layerOriginalLegendNodes()

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 1562 of file qgslayertreemodel.cpp.

◆ layerStyleOverrides()

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 712 of file qgslayertreemodel.cpp.

◆ layerTreeNodeFont()

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 604 of file qgslayertreemodel.cpp.

◆ legendCleanup()

void QgsLayerTreeModel::legendCleanup ( )
protected

Definition at line 1248 of file qgslayertreemodel.cpp.

◆ legendEmbeddedInParent()

bool QgsLayerTreeModel::legendEmbeddedInParent ( QgsLayerTreeLayer nodeLayer) const
protected

Definition at line 1530 of file qgslayertreemodel.cpp.

◆ legendFilterByScale()

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 226 of file qgslayertreemodel.h.

◆ legendFilterMapSettings()

const QgsMapSettings* QgsLayerTreeModel::legendFilterMapSettings ( ) const
inline

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

Since
QGIS 2.14

Definition at line 250 of file qgslayertreemodel.h.

◆ legendIconEmbeddedInParent()

QIcon QgsLayerTreeModel::legendIconEmbeddedInParent ( QgsLayerTreeLayer nodeLayer) const
protected

Definition at line 1541 of file qgslayertreemodel.cpp.

◆ legendInvalidateMapBasedData()

void QgsLayerTreeModel::legendInvalidateMapBasedData ( )
protected

Definition at line 1589 of file qgslayertreemodel.cpp.

◆ legendMapViewData()

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 nullptr 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 705 of file qgslayertreemodel.cpp.

◆ legendNode2index()

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 1419 of file qgslayertreemodel.cpp.

◆ legendNodeData()

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

Definition at line 1513 of file qgslayertreemodel.cpp.

◆ legendNodeDataChanged

void QgsLayerTreeModel::legendNodeDataChanged ( )
protectedslot

Definition at line 860 of file qgslayertreemodel.cpp.

◆ legendNodeEmbeddedInParent()

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 1535 of file qgslayertreemodel.cpp.

◆ legendNodeFlags()

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

Definition at line 1521 of file qgslayertreemodel.cpp.

◆ legendNodeIndex()

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

Definition at line 1483 of file qgslayertreemodel.cpp.

◆ legendNodeRowCount()

int QgsLayerTreeModel::legendNodeRowCount ( QgsLayerTreeModelLegendNode node) const
protected

Definition at line 1448 of file qgslayertreemodel.cpp.

◆ legendParent()

QModelIndex QgsLayerTreeModel::legendParent ( QgsLayerTreeModelLegendNode legendNode) const
protected

Definition at line 1493 of file qgslayertreemodel.cpp.

◆ legendRootIndex()

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

Definition at line 1472 of file qgslayertreemodel.cpp.

◆ legendRootRowCount()

int QgsLayerTreeModel::legendRootRowCount ( QgsLayerTreeLayer nL) const
protected

Definition at line 1458 of file qgslayertreemodel.cpp.

◆ messageEmitted

void QgsLayerTreeModel::messageEmitted ( const QString &  message,
Qgis::MessageLevel  level = Qgis::Info,
int  duration = 5 
)
signal

Emits a message than can be displayed to the user in a GUI class.

Since
QGIS 3.14

◆ mimeData()

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

Definition at line 1056 of file qgslayertreemodel.cpp.

◆ mimeTypes()

QStringList QgsLayerTreeModel::mimeTypes ( ) const
override

Definition at line 1048 of file qgslayertreemodel.cpp.

◆ node2index()

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 456 of file qgslayertreemodel.cpp.

◆ nodeAddedChildren

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

Definition at line 748 of file qgslayertreemodel.cpp.

◆ nodeCustomPropertyChanged

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

Definition at line 794 of file qgslayertreemodel.cpp.

◆ nodeLayerLoaded

void QgsLayerTreeModel::nodeLayerLoaded ( )
protectedslot

Definition at line 801 of file qgslayertreemodel.cpp.

◆ nodeLayerWillBeUnloaded

void QgsLayerTreeModel::nodeLayerWillBeUnloaded ( )
protectedslot

Definition at line 811 of file qgslayertreemodel.cpp.

◆ nodeNameChanged

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

Updates model when node's name has changed.

Since
QGIS 3.0

Definition at line 784 of file qgslayertreemodel.cpp.

◆ nodeRemovedChildren

void QgsLayerTreeModel::nodeRemovedChildren ( )
protectedslot

Definition at line 771 of file qgslayertreemodel.cpp.

◆ nodeVisibilityChanged

void QgsLayerTreeModel::nodeVisibilityChanged ( QgsLayerTreeNode node)
protectedslot

Definition at line 776 of file qgslayertreemodel.cpp.

◆ nodeWillAddChildren

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

Definition at line 727 of file qgslayertreemodel.cpp.

◆ nodeWillRemoveChildren

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

Definition at line 759 of file qgslayertreemodel.cpp.

◆ parent()

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

Definition at line 121 of file qgslayertreemodel.cpp.

◆ recursivelyEmitDataChanged()

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

emit dataChanged() for layer tree node items

Definition at line 1009 of file qgslayertreemodel.cpp.

◆ refreshLayerLegend()

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 539 of file qgslayertreemodel.cpp.

◆ refreshScaleBasedLayers()

void QgsLayerTreeModel::refreshScaleBasedLayers ( const QModelIndex &  index = QModelIndex(),
double  previousScale = 0.0 
)
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 1023 of file qgslayertreemodel.cpp.

◆ removeLegendFromLayer()

void QgsLayerTreeModel::removeLegendFromLayer ( QgsLayerTreeLayer nodeLayer)
protected

Definition at line 1260 of file qgslayertreemodel.cpp.

◆ removeRows()

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

Definition at line 1159 of file qgslayertreemodel.cpp.

◆ rootGroup()

QgsLayerTree * QgsLayerTreeModel::rootGroup ( ) const

Returns pointer to the root node of the layer tree. Always a non nullptr value.

Definition at line 519 of file qgslayertreemodel.cpp.

◆ rowCount()

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

Definition at line 73 of file qgslayertreemodel.cpp.

◆ scaleIconSize()

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 722 of file qgslayertreemodel.cpp.

◆ setAutoCollapseLegendNodes()

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 206 of file qgslayertreemodel.h.

◆ setCurrentIndex()

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 567 of file qgslayertreemodel.cpp.

◆ setData()

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

Definition at line 392 of file qgslayertreemodel.cpp.

◆ setFlag()

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

Enable or disable a model flag.

Definition at line 1175 of file qgslayertreemodel.cpp.

◆ setFlags()

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

Sets OR-ed combination of model flags.

Definition at line 1170 of file qgslayertreemodel.cpp.

◆ setLayerStyleOverrides()

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 717 of file qgslayertreemodel.cpp.

◆ setLayerTreeNodeFont()

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 579 of file qgslayertreemodel.cpp.

◆ setLegendFilter()

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
settingsMap settings. Setting nullptr or invalid settings will disable any filter. Ownership is not changed, a copy is made
useExtentWhether to use the extent of the map settings as a first spatial filter on legend nodes
polygonIf not empty, this polygon will be used instead of the map extent to filter legend nodes
useExpressionsWhether to use legend node filter expressions
Since
QGIS 2.14

Definition at line 633 of file qgslayertreemodel.cpp.

◆ setLegendFilterByMap()

void QgsLayerTreeModel::setLegendFilterByMap ( const QgsMapSettings settings)

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

Setting nullptr 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 628 of file qgslayertreemodel.cpp.

◆ setLegendFilterByScale()

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 617 of file qgslayertreemodel.cpp.

◆ setLegendMapViewData()

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 correctly.

Since
QGIS 2.6

Definition at line 688 of file qgslayertreemodel.cpp.

◆ setRootGroup()

void QgsLayerTreeModel::setRootGroup ( QgsLayerTree newRootGroup)

Reset the model and use a new root group node.

Since
QGIS 2.6

Definition at line 524 of file qgslayertreemodel.cpp.

◆ supportedDropActions()

Qt::DropActions QgsLayerTreeModel::supportedDropActions ( ) const
override

Definition at line 1043 of file qgslayertreemodel.cpp.

◆ testFlag()

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

Check whether a flag is enabled.

Definition at line 1188 of file qgslayertreemodel.cpp.

◆ tryBuildLegendTree()

QgsLayerTreeModel::LayerLegendTree * QgsLayerTreeModel::tryBuildLegendTree ( const QList< QgsLayerTreeModelLegendNode *> &  nodes)
protected
Note
not available in Python bindings

Definition at line 1355 of file qgslayertreemodel.cpp.

Member Data Documentation

◆ mAutoCollapseLegendNodesCount

int QgsLayerTreeModel::mAutoCollapseLegendNodesCount
protected

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

Definition at line 372 of file qgslayertreemodel.h.

◆ mCurrentIndex

QPersistentModelIndex QgsLayerTreeModel::mCurrentIndex
protected

Current index - will be underlined.

Definition at line 370 of file qgslayertreemodel.h.

◆ mDeferLegendInvalidationTimer

QTimer QgsLayerTreeModel::mDeferLegendInvalidationTimer
protected

Definition at line 459 of file qgslayertreemodel.h.

◆ mFlags

Flags QgsLayerTreeModel::mFlags
protected

Sets of flags for the model.

Definition at line 368 of file qgslayertreemodel.h.

◆ mFontGroup

QFont QgsLayerTreeModel::mFontGroup
protected

Definition at line 445 of file qgslayertreemodel.h.

◆ mFontLayer

QFont QgsLayerTreeModel::mFontLayer
protected

Definition at line 444 of file qgslayertreemodel.h.

◆ mInvalidatedNodes

QSet<QgsLayerTreeLayer *> QgsLayerTreeModel::mInvalidatedNodes
protected

Keep track of layer nodes for which the legend size needs to be recalculated.

Definition at line 442 of file qgslayertreemodel.h.

◆ mLayerStyleOverrides

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 433 of file qgslayertreemodel.h.

◆ mLegend

QHash<QgsLayerTreeLayer *, LayerLegendData> QgsLayerTreeModel::mLegend
protected

Per layer data about layer's legend nodes.

Definition at line 436 of file qgslayertreemodel.h.

◆ mLegendFilterByScale

double QgsLayerTreeModel::mLegendFilterByScale
protected

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

Definition at line 448 of file qgslayertreemodel.h.

◆ mLegendFilterHitTest

std::unique_ptr<QgsMapHitTest> QgsLayerTreeModel::mLegendFilterHitTest
protected

Definition at line 451 of file qgslayertreemodel.h.

◆ mLegendFilterMapSettings

std::unique_ptr<QgsMapSettings> QgsLayerTreeModel::mLegendFilterMapSettings
protected

Definition at line 450 of file qgslayertreemodel.h.

◆ mLegendFilterUsesExtent

bool QgsLayerTreeModel::mLegendFilterUsesExtent
protected

whether to use map filtering

Definition at line 454 of file qgslayertreemodel.h.

◆ mLegendMapViewDpi

int QgsLayerTreeModel::mLegendMapViewDpi
protected

Definition at line 457 of file qgslayertreemodel.h.

◆ mLegendMapViewMupp

double QgsLayerTreeModel::mLegendMapViewMupp
protected

Definition at line 456 of file qgslayertreemodel.h.

◆ mLegendMapViewScale

double QgsLayerTreeModel::mLegendMapViewScale
protected

Definition at line 458 of file qgslayertreemodel.h.

◆ mRootNode

QgsLayerTree* QgsLayerTreeModel::mRootNode = nullptr
protected

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

Definition at line 366 of file qgslayertreemodel.h.


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