QGIS API Documentation  2.99.0-Master (0cba29c)
Signals | Public Member Functions | Static Public Member Functions | Protected Member Functions | Protected Attributes | List of all members
QgsLayerTreeLayer Class Reference

Layer tree node points to a map layer. More...

#include <qgslayertreelayer.h>

Inheritance diagram for QgsLayerTreeLayer:
Inheritance graph
[legend]

Signals

void layerLoaded ()
 Emitted when a previously unavailable layer got loaded. More...
 
void layerWillBeUnloaded ()
 Emitted when a previously available layer got unloaded (from layer registry). More...
 
- Signals inherited from QgsLayerTreeNode
void addedChildren (QgsLayerTreeNode *node, int indexFrom, int indexTo)
 Emitted when one or more nodes have been added to a node within the tree. More...
 
void customPropertyChanged (QgsLayerTreeNode *node, const QString &key)
 Emitted when a custom property of a node within the tree has been changed or removed. More...
 
void expandedChanged (QgsLayerTreeNode *node, bool expanded)
 Emitted when the collapsed/expanded state of a node within the tree has been changed. More...
 
void nameChanged (QgsLayerTreeNode *node, QString name)
 Emitted when the name of the node is changed. More...
 
void removedChildren (QgsLayerTreeNode *node, int indexFrom, int indexTo)
 Emitted when one or more nodes has been removed from a node within the tree. More...
 
void visibilityChanged (QgsLayerTreeNode *node)
 Emitted when check state of a node within the tree has been changed. More...
 
void willAddChildren (QgsLayerTreeNode *node, int indexFrom, int indexTo)
 Emitted when one or more nodes will be added to a node within the tree. More...
 
void willRemoveChildren (QgsLayerTreeNode *node, int indexFrom, int indexTo)
 Emitted when one or more nodes will be removed from a node within the tree. More...
 

Public Member Functions

 QgsLayerTreeLayer (QgsMapLayer *layer)
 
 QgsLayerTreeLayer (const QgsLayerTreeLayer &other)
 
 QgsLayerTreeLayer (const QString &layerId, const QString &name=QString(), const QString &source=QString(), const QString &provider=QString())
 Constructor for QgsLayerTreeLayer using weak references to layer ID, name, public source, and provider key. More...
 
virtual QgsLayerTreeLayerclone () const override
 Create a copy of the node. Returns new instance. More...
 
virtual QString dump () const override
 Return string with layer tree structure. For debug purposes only. More...
 
QgsMapLayerlayer () const
 
QString layerId () const
 
QString name () const override
 Returns the layer's name. More...
 
virtual void resolveReferences (const QgsProject *project, bool looseMatching=false) override
 Resolves reference to layer from stored layer ID (if it has not been resolved already) More...
 
void setName (const QString &n) override
 Sets the layer's name. More...
 
virtual void writeXml (QDomElement &parentElement) override
 Write layer tree to XML. More...
 
- Public Member Functions inherited from QgsLayerTreeNode
 ~QgsLayerTreeNode ()
 
QList< QgsMapLayer *> checkedLayers () const
 Returns a list of any checked layers which belong to this node or its children. More...
 
QList< QgsLayerTreeNode * > children ()
 Get list of children of the node. Children are owned by the parent. More...
 
QList< QgsLayerTreeNode * > children () const
 Get list of children of the node. Children are owned by the parent. More...
 
QStringList customProperties () const
 Return list of keys stored in custom properties. More...
 
QVariant customProperty (const QString &key, const QVariant &defaultValue=QVariant()) const
 Read a custom property from layer. Properties are stored in a map and saved in project file. More...
 
bool isExpanded () const
 Return whether the node should be shown as expanded or collapsed in GUI. More...
 
bool isItemVisibilityCheckedRecursive () const
 Return whether this node is checked and all its children. More...
 
bool isItemVisibilityUncheckedRecursive () const
 Return whether this node is unchecked and all its children. More...
 
bool isVisible () const
 Returns whether a node is really visible (ie checked and all its ancestors checked as well) More...
 
bool itemVisibilityChecked () const
 Returns whether a node is checked (independently of its ancestors or children) More...
 
NodeType nodeType () const
 Find out about type of the node. It is usually shorter to use convenience functions from QgsLayerTree namespace for that. More...
 
QgsLayerTreeNodeparent ()
 Get pointer to the parent. If parent is a null pointer, the node is a root node. More...
 
void removeCustomProperty (const QString &key)
 Remove a custom property from layer. Properties are stored in a map and saved in project file. More...
 
void setCustomProperty (const QString &key, const QVariant &value)
 Set a custom property for the node. Properties are stored in a map and saved in project file. More...
 
void setExpanded (bool expanded)
 Set whether the node should be shown as expanded or collapsed in GUI. More...
 
void setItemVisibilityChecked (bool checked)
 Check or uncheck a node (independently of its ancestors or children) More...
 
void setItemVisibilityCheckedParentRecursive (bool checked)
 Check or uncheck a node and all its parents. More...
 
virtual void setItemVisibilityCheckedRecursive (bool checked)
 Check or uncheck a node and all its children (taking into account exclusion rules) More...
 
bool takeChild (QgsLayerTreeNode *node)
 Remove a child from a node. More...
 

Static Public Member Functions

static QgsLayerTreeLayerreadXml (QDomElement &element)
 Read layer node from XML. More...
 
static QgsLayerTreeLayerreadXml (QDomElement &element, const QgsProject *project)
 Read layer node from XML. More...
 
- Static Public Member Functions inherited from QgsLayerTreeNode
static QgsLayerTreeNodereadXml (QDomElement &element)
 Read layer tree from XML. More...
 
static QgsLayerTreeNodereadXml (QDomElement &element, const QgsProject *project)
 Read layer tree from XML. More...
 

Protected Member Functions

void attachToLayer ()
 
- Protected Member Functions inherited from QgsLayerTreeNode
 QgsLayerTreeNode (NodeType t, bool checked=true)
 Constructor. More...
 
 QgsLayerTreeNode (const QgsLayerTreeNode &other)
 
void insertChildrenPrivate (int index, QList< QgsLayerTreeNode *> nodes)
 Low-level insertion of children to the node. The children must not have any parent yet! More...
 
void readCommonXml (QDomElement &element)
 Read common XML elements. More...
 
void removeChildrenPrivate (int from, int count, bool destroy=true)
 Low-level removal of children from the node. More...
 
void writeCommonXml (QDomElement &element)
 Write common XML elements. More...
 

Protected Attributes

QString mLayerName
 Layer name - only used if layer does not exist. More...
 
QgsMapLayerRef mRef
 Weak reference to the layer (or just it's ID if the reference is not resolved yet) More...
 
- Protected Attributes inherited from QgsLayerTreeNode
bool mChecked
 
QList< QgsLayerTreeNode * > mChildren
 list of children - node is responsible for their deletion More...
 
bool mExpanded
 whether the node should be shown in GUI as expanded More...
 
NodeType mNodeType
 type of the node - determines which subclass is used More...
 
QgsLayerTreeNodemParent = nullptr
 pointer to the parent node - null in case of root node More...
 
QgsObjectCustomProperties mProperties
 custom properties attached to the node More...
 

Additional Inherited Members

- Public Types inherited from QgsLayerTreeNode
enum  NodeType { NodeGroup, NodeLayer }
 Enumeration of possible tree node types. More...
 

Detailed Description

Layer tree node points to a map layer.

The node can exist also without a valid instance of a layer (just ID). That means the referenced layer does not need to be loaded in order to use it in layer tree. In such case, resolveReferences() method can be called once the layer is loaded.

A map layer is supposed to be present in one layer tree just once. It is however possible that temporarily a layer exists in one tree more than just once, e.g. while reordering items with drag and drop.

Since
QGIS 2.4

Definition at line 40 of file qgslayertreelayer.h.

Constructor & Destructor Documentation

◆ QgsLayerTreeLayer() [1/3]

QgsLayerTreeLayer::QgsLayerTreeLayer ( QgsMapLayer layer)
explicit

Definition at line 23 of file qgslayertreelayer.cpp.

◆ QgsLayerTreeLayer() [2/3]

QgsLayerTreeLayer::QgsLayerTreeLayer ( const QgsLayerTreeLayer other)

Definition at line 38 of file qgslayertreelayer.cpp.

◆ QgsLayerTreeLayer() [3/3]

QgsLayerTreeLayer::QgsLayerTreeLayer ( const QString &  layerId,
const QString &  name = QString(),
const QString &  source = QString(),
const QString &  provider = QString() 
)
explicit

Constructor for QgsLayerTreeLayer using weak references to layer ID, name, public source, and provider key.

Definition at line 31 of file qgslayertreelayer.cpp.

Member Function Documentation

◆ attachToLayer()

void QgsLayerTreeLayer::attachToLayer ( )
protected

Definition at line 67 of file qgslayertreelayer.cpp.

◆ clone()

QgsLayerTreeLayer * QgsLayerTreeLayer::clone ( ) const
overridevirtual

Create a copy of the node. Returns new instance.

Implements QgsLayerTreeNode.

Definition at line 158 of file qgslayertreelayer.cpp.

◆ dump()

QString QgsLayerTreeLayer::dump ( ) const
overridevirtual

Return string with layer tree structure. For debug purposes only.

Implements QgsLayerTreeNode.

Definition at line 153 of file qgslayertreelayer.cpp.

◆ layer()

QgsMapLayer* QgsLayerTreeLayer::layer ( ) const
inline

Definition at line 57 of file qgslayertreelayer.h.

◆ layerId()

QString QgsLayerTreeLayer::layerId ( ) const
inline

Definition at line 55 of file qgslayertreelayer.h.

◆ layerLoaded

void QgsLayerTreeLayer::layerLoaded ( )
signal

Emitted when a previously unavailable layer got loaded.

◆ layerWillBeUnloaded

void QgsLayerTreeLayer::layerWillBeUnloaded ( )
signal

Emitted when a previously available layer got unloaded (from layer registry).

Since
QGIS 2.6

◆ name()

QString QgsLayerTreeLayer::name ( ) const
overridevirtual

Returns the layer's name.

Since
QGIS 3.0

Implements QgsLayerTreeNode.

Definition at line 77 of file qgslayertreelayer.cpp.

◆ readXml() [1/2]

QgsLayerTreeLayer * QgsLayerTreeLayer::readXml ( QDomElement &  element)
static

Read layer node from XML.

Returns new instance. Does not resolve textual references to layers. Call resolveReferences() afterwards to do it.

Definition at line 100 of file qgslayertreelayer.cpp.

◆ readXml() [2/2]

QgsLayerTreeLayer * QgsLayerTreeLayer::readXml ( QDomElement &  element,
const QgsProject project 
)
static

Read layer node from XML.

Returns new instance. Also resolves textual references to layers from the project (calls resolveReferences() internally).

Since
QGIS 3.0

Definition at line 124 of file qgslayertreelayer.cpp.

◆ resolveReferences()

void QgsLayerTreeLayer::resolveReferences ( const QgsProject project,
bool  looseMatching = false 
)
overridevirtual

Resolves reference to layer from stored layer ID (if it has not been resolved already)

Since
QGIS 3.0

Implements QgsLayerTreeNode.

Definition at line 46 of file qgslayertreelayer.cpp.

◆ setName()

void QgsLayerTreeLayer::setName ( const QString &  n)
overridevirtual

Sets the layer's name.

Since
QGIS 3.0

Implements QgsLayerTreeNode.

Definition at line 82 of file qgslayertreelayer.cpp.

◆ writeXml()

void QgsLayerTreeLayer::writeXml ( QDomElement &  parentElement)
overridevirtual

Write layer tree to XML.

Implements QgsLayerTreeNode.

Definition at line 132 of file qgslayertreelayer.cpp.

Member Data Documentation

◆ mLayerName

QString QgsLayerTreeLayer::mLayerName
protected

Layer name - only used if layer does not exist.

Definition at line 115 of file qgslayertreelayer.h.

◆ mRef

QgsMapLayerRef QgsLayerTreeLayer::mRef
protected

Weak reference to the layer (or just it's ID if the reference is not resolved yet)

Definition at line 113 of file qgslayertreelayer.h.


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