QGIS API Documentation  3.2.0-Bonn (bc43194)
Classes | Public Types | Signals | Public Member Functions | Protected Member Functions | Protected Attributes | List of all members
QgsLayerTreeModelLegendNode Class Referenceabstract

The QgsLegendRendererItem class is abstract interface for legend items returned from QgsMapLayerLegend implementation. More...

#include <qgslayertreemodellegendnode.h>

Inheritance diagram for QgsLayerTreeModelLegendNode:
Inheritance graph
[legend]

Classes

struct  ItemContext
 
struct  ItemMetrics
 

Public Types

enum  LegendNodeRoles { RuleKeyRole = Qt::UserRole, ParentRuleKeyRole }
 

Signals

void dataChanged ()
 Emitted on internal data change so the layer tree model can forward the signal to views. More...
 

Public Member Functions

virtual QVariant data (int role) const =0
 Returns data associated with the item. Must be implemented in derived class. More...
 
virtual ItemMetrics draw (const QgsLegendSettings &settings, ItemContext *ctx)
 Entry point called from QgsLegendRenderer to do the rendering. More...
 
virtual QSizeF drawSymbol (const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight) const
 Draws symbol on the left side of the item. More...
 
virtual QSizeF drawSymbolText (const QgsLegendSettings &settings, ItemContext *ctx, QSizeF symbolSize) const
 Draws label on the right side of the item. More...
 
virtual Qt::ItemFlags flags () const
 Returns item flags associated with the item. Default implementation returns Qt::ItemIsEnabled. More...
 
virtual void invalidateMapBasedData ()
 Notification from model that information from associated map view has changed. More...
 
virtual bool isEmbeddedInParent () const
 
virtual bool isScaleOK (double scale) const
 
QgsLayerTreeLayerlayerNode () const
 Returns pointer to the parent layer node. More...
 
QgsLayerTreeModelmodel () const
 Returns pointer to model owning this legend node. More...
 
virtual bool setData (const QVariant &value, int role)
 Sets some data associated with the item. Default implementation does nothing and returns false. More...
 
virtual void setEmbeddedInParent (bool embedded)
 
virtual void setUserLabel (const QString &userLabel)
 
virtual QString userLabel () const
 

Protected Member Functions

 QgsLayerTreeModelLegendNode (QgsLayerTreeLayer *nodeL, QObject *parent=nullptr)
 Construct the node with pointer to its parent layer node. More...
 
QgsRenderContextcreateTemporaryRenderContext () const
 Returns a temporary context or null if legendMapViewData are not valid. More...
 

Protected Attributes

bool mEmbeddedInParent
 
QgsLayerTreeLayermLayerNode = nullptr
 
QString mUserLabel
 

Detailed Description

The QgsLegendRendererItem class is abstract interface for legend items returned from QgsMapLayerLegend implementation.

The objects are used in QgsLayerTreeModel. Custom implementations may offer additional interactivity and customized look.

Since
QGIS 2.6

Definition at line 48 of file qgslayertreemodellegendnode.h.

Member Enumeration Documentation

◆ LegendNodeRoles

Enumerator
RuleKeyRole 

Rule key of the node (QString)

ParentRuleKeyRole 

Rule key of the parent legend node - for legends with tree hierarchy (QString). Added in 2.8.

Definition at line 53 of file qgslayertreemodellegendnode.h.

Constructor & Destructor Documentation

◆ QgsLayerTreeModelLegendNode()

QgsLayerTreeModelLegendNode::QgsLayerTreeModelLegendNode ( QgsLayerTreeLayer nodeL,
QObject *  parent = nullptr 
)
explicitprotected

Construct the node with pointer to its parent layer node.

Definition at line 32 of file qgslayertreemodellegendnode.cpp.

Member Function Documentation

◆ createTemporaryRenderContext()

QgsRenderContext * QgsLayerTreeModelLegendNode::createTemporaryRenderContext ( ) const
protected

Returns a temporary context or null if legendMapViewData are not valid.

Definition at line 229 of file qgslayertreemodellegendnode.cpp.

◆ data()

virtual QVariant QgsLayerTreeModelLegendNode::data ( int  role) const
pure virtual

Returns data associated with the item. Must be implemented in derived class.

Implemented in QgsDataDefinedSizeLegendNode, QgsWmsLegendNode, QgsRasterSymbolLegendNode, QgsImageLegendNode, QgsSimpleLegendNode, and QgsSymbolLegendNode.

◆ dataChanged

void QgsLayerTreeModelLegendNode::dataChanged ( )
signal

Emitted on internal data change so the layer tree model can forward the signal to views.

◆ draw()

QgsLayerTreeModelLegendNode::ItemMetrics QgsLayerTreeModelLegendNode::draw ( const QgsLegendSettings settings,
ItemContext ctx 
)
virtual

Entry point called from QgsLegendRenderer to do the rendering.

Default implementation calls drawSymbol() and drawSymbolText() methods.

If ctx is null, this is just first stage when preparing layout - without actual rendering.

Reimplemented in QgsDataDefinedSizeLegendNode.

Definition at line 57 of file qgslayertreemodellegendnode.cpp.

◆ drawSymbol()

QSizeF QgsLayerTreeModelLegendNode::drawSymbol ( const QgsLegendSettings settings,
ItemContext ctx,
double  itemHeight 
) const
virtual

Draws symbol on the left side of the item.

Parameters
settingsLegend layout configuration
ctxContext for rendering - may be null if only doing layout without actual rendering
itemHeightMinimal height of the legend item - used for correct positioning when rendering
Returns
Real size of the symbol (may be bigger than "normal" symbol size from settings)

Reimplemented in QgsWmsLegendNode, QgsRasterSymbolLegendNode, QgsImageLegendNode, and QgsSymbolLegendNode.

Definition at line 74 of file qgslayertreemodellegendnode.cpp.

◆ drawSymbolText()

QSizeF QgsLayerTreeModelLegendNode::drawSymbolText ( const QgsLegendSettings settings,
ItemContext ctx,
QSizeF  symbolSize 
) const
virtual

Draws label on the right side of the item.

Parameters
settingsLegend layout configuration
ctxContext for rendering - may be null if only doing layout without actual rendering
symbolSizeReal size of the associated symbol - used for correct positioning when rendering
Returns
Size of the label (may span multiple lines)

Definition at line 87 of file qgslayertreemodellegendnode.cpp.

◆ flags()

Qt::ItemFlags QgsLayerTreeModelLegendNode::flags ( ) const
virtual

Returns item flags associated with the item. Default implementation returns Qt::ItemIsEnabled.

Reimplemented in QgsSymbolLegendNode.

Definition at line 44 of file qgslayertreemodellegendnode.cpp.

◆ invalidateMapBasedData()

virtual void QgsLayerTreeModelLegendNode::invalidateMapBasedData ( )
inlinevirtual

Notification from model that information from associated map view has changed.

Default implementation does nothing.

Reimplemented in QgsWmsLegendNode, and QgsSymbolLegendNode.

Definition at line 85 of file qgslayertreemodellegendnode.h.

◆ isEmbeddedInParent()

virtual bool QgsLayerTreeModelLegendNode::isEmbeddedInParent ( ) const
inlinevirtual

Definition at line 74 of file qgslayertreemodellegendnode.h.

◆ isScaleOK()

virtual bool QgsLayerTreeModelLegendNode::isScaleOK ( double  scale) const
inlinevirtual

Reimplemented in QgsSymbolLegendNode.

Definition at line 80 of file qgslayertreemodellegendnode.h.

◆ layerNode()

QgsLayerTreeLayer* QgsLayerTreeModelLegendNode::layerNode ( ) const
inline

Returns pointer to the parent layer node.

Definition at line 60 of file qgslayertreemodellegendnode.h.

◆ model()

QgsLayerTreeModel * QgsLayerTreeModelLegendNode::model ( ) const

Returns pointer to model owning this legend node.

Definition at line 39 of file qgslayertreemodellegendnode.cpp.

◆ setData()

bool QgsLayerTreeModelLegendNode::setData ( const QVariant &  value,
int  role 
)
virtual

Sets some data associated with the item. Default implementation does nothing and returns false.

Reimplemented in QgsSymbolLegendNode.

Definition at line 49 of file qgslayertreemodellegendnode.cpp.

◆ setEmbeddedInParent()

virtual void QgsLayerTreeModelLegendNode::setEmbeddedInParent ( bool  embedded)
inlinevirtual

Reimplemented in QgsSymbolLegendNode.

Definition at line 75 of file qgslayertreemodellegendnode.h.

◆ setUserLabel()

virtual void QgsLayerTreeModelLegendNode::setUserLabel ( const QString &  userLabel)
inlinevirtual

Reimplemented in QgsSymbolLegendNode.

Definition at line 78 of file qgslayertreemodellegendnode.h.

◆ userLabel()

virtual QString QgsLayerTreeModelLegendNode::userLabel ( ) const
inlinevirtual

Definition at line 77 of file qgslayertreemodellegendnode.h.

Member Data Documentation

◆ mEmbeddedInParent

bool QgsLayerTreeModelLegendNode::mEmbeddedInParent
protected

Definition at line 142 of file qgslayertreemodellegendnode.h.

◆ mLayerNode

QgsLayerTreeLayer* QgsLayerTreeModelLegendNode::mLayerNode = nullptr
protected

Definition at line 141 of file qgslayertreemodellegendnode.h.

◆ mUserLabel

QString QgsLayerTreeModelLegendNode::mUserLabel
protected

Definition at line 143 of file qgslayertreemodellegendnode.h.


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