QGIS API Documentation  2.7.0-Master
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Modules Pages
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, SymbolV2LegacyRuleKeyRole }
 

Signals

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

Public Member Functions

 ~QgsLayerTreeModelLegendNode ()
 
virtual QVariant data (int role) const =0
 Return data associated with the item. 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, const QSizeF &symbolSize) const
 Draws label on the right side of the item. More...
 
virtual Qt::ItemFlags flags () const
 Return item flags associated with the item. 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
 Return pointer to the parent layer node. More...
 
QgsLayerTreeModelmodel () const
 Return pointer to model owning this legend node. More...
 
virtual bool setData (const QVariant &value, int role)
 Set some data associated with the item. More...
 
virtual void setEmbeddedInParent (bool embedded)
 
virtual void setUserLabel (const QString &userLabel)
 
virtual QString userLabel () const
 

Protected Member Functions

 QgsLayerTreeModelLegendNode (QgsLayerTreeLayer *nodeL, QObject *parent=0)
 Construct the node with pointer to its parent layer node. More...
 

Protected Attributes

bool mEmbeddedInParent
 
QgsLayerTreeLayermLayerNode
 
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.

Note
added in 2.6

Definition at line 36 of file qgslayertreemodellegendnode.h.

Member Enumeration Documentation

Enumerator
RuleKeyRole 

rule key of the node (QString)

SymbolV2LegacyRuleKeyRole 

for QgsSymbolV2LegendNode only - legacy rule key (void ptr, to be cast to QgsSymbolV2 ptr)

Definition at line 42 of file qgslayertreemodellegendnode.h.

Constructor & Destructor Documentation

QgsLayerTreeModelLegendNode::~QgsLayerTreeModelLegendNode ( )

Definition at line 35 of file qgslayertreemodellegendnode.cpp.

QgsLayerTreeModelLegendNode::QgsLayerTreeModelLegendNode ( QgsLayerTreeLayer nodeL,
QObject *  parent = 0 
)
explicitprotected

Construct the node with pointer to its parent layer node.

Definition at line 28 of file qgslayertreemodellegendnode.cpp.

Member Function Documentation

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

Return data associated with the item.

Must be implemented in derived class.

Implemented in QgsRasterSymbolLegendNode, QgsImageLegendNode, QgsSimpleLegendNode, and QgsSymbolV2LegendNode.

void QgsLayerTreeModelLegendNode::dataChanged ( )
signal

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

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.

Definition at line 57 of file qgslayertreemodellegendnode.cpp.

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 QgsRasterSymbolLegendNode, QgsImageLegendNode, and QgsSymbolV2LegendNode.

Definition at line 74 of file qgslayertreemodellegendnode.cpp.

QSizeF QgsLayerTreeModelLegendNode::drawSymbolText ( const QgsLegendSettings settings,
ItemContext ctx,
const 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.

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

Return item flags associated with the item.

Default implementation returns Qt::ItemIsEnabled.

Reimplemented in QgsSymbolV2LegendNode.

Definition at line 44 of file qgslayertreemodellegendnode.cpp.

virtual void QgsLayerTreeModelLegendNode::invalidateMapBasedData ( )
inlinevirtual

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

Default implementation does nothing.

Reimplemented in QgsSymbolV2LegendNode.

Definition at line 73 of file qgslayertreemodellegendnode.h.

virtual bool QgsLayerTreeModelLegendNode::isEmbeddedInParent ( ) const
inlinevirtual

Definition at line 63 of file qgslayertreemodellegendnode.h.

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

Reimplemented in QgsSymbolV2LegendNode.

Definition at line 69 of file qgslayertreemodellegendnode.h.

QgsLayerTreeLayer* QgsLayerTreeModelLegendNode::layerNode ( ) const
inline

Return pointer to the parent layer node.

Definition at line 49 of file qgslayertreemodellegendnode.h.

QgsLayerTreeModel * QgsLayerTreeModelLegendNode::model ( ) const

Return pointer to model owning this legend node.

Definition at line 39 of file qgslayertreemodellegendnode.cpp.

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

Set some data associated with the item.

Default implementation does nothing and returns false.

Reimplemented in QgsSymbolV2LegendNode.

Definition at line 49 of file qgslayertreemodellegendnode.cpp.

virtual void QgsLayerTreeModelLegendNode::setEmbeddedInParent ( bool  embedded)
inlinevirtual

Reimplemented in QgsSymbolV2LegendNode.

Definition at line 64 of file qgslayertreemodellegendnode.h.

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

Reimplemented in QgsSymbolV2LegendNode.

Definition at line 67 of file qgslayertreemodellegendnode.h.

virtual QString QgsLayerTreeModelLegendNode::userLabel ( ) const
inlinevirtual

Definition at line 66 of file qgslayertreemodellegendnode.h.

Member Data Documentation

bool QgsLayerTreeModelLegendNode::mEmbeddedInParent
protected

Definition at line 126 of file qgslayertreemodellegendnode.h.

QgsLayerTreeLayer* QgsLayerTreeModelLegendNode::mLayerNode
protected

Definition at line 125 of file qgslayertreemodellegendnode.h.

QString QgsLayerTreeModelLegendNode::mUserLabel
protected

Definition at line 127 of file qgslayertreemodellegendnode.h.


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