QgsRasterSymbolLegendNode Class Reference

Implementation of legend node interface for displaying raster legend entries. More...

#include <qgslayertreemodellegendnode.h>

Inheritance diagram for QgsRasterSymbolLegendNode:

Public Member Functions
	QgsRasterSymbolLegendNode (QgsLayerTreeLayer *nodeLayer, const QColor &color, const QString &label, QObject *parent=nullptr, bool isCheckable=false, const QString &ruleKey=QString())
	Constructor for QgsRasterSymbolLegendNode.
QVariant	data (int role) const override
	Returns data associated with the item. Must be implemented in derived class.
QSizeF	drawSymbol (const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight) const override
	Draws symbol on the left side of the item.
QJsonObject	exportSymbolToJson (const QgsLegendSettings &settings, const QgsRenderContext &context) const override
	Adds a symbol in base64 string within a JSON object with the key "icon".
Qt::ItemFlags	flags () const override
	Returns item flags associated with the item. Default implementation returns Qt::ItemIsEnabled.
bool	isCheckable () const
	Returns whether the item is user-checkable - whether renderer supports enabling/disabling it.
QString	ruleKey () const
	Returns the unique identifier of node for identification of the item within renderer.
bool	setData (const QVariant &value, int role) override
	Sets some data associated with the item. Default implementation does nothing and returns false.
Public Member Functions inherited from QgsLayerTreeModelLegendNode
virtual bool	columnBreak () const
	Returns whether a forced column break should occur before the node.
virtual ItemMetrics	draw (const QgsLegendSettings &settings, ItemContext *ctx)
	Entry point called from QgsLegendRenderer to do the rendering.
virtual QSizeF	drawSymbolText (const QgsLegendSettings &settings, ItemContext *ctx, QSizeF symbolSize) const
	Draws label on the right side of the item.
QJsonObject	exportToJson (const QgsLegendSettings &settings, const QgsRenderContext &context)
	Entry point called from QgsLegendRenderer to do the rendering in a JSON object.
virtual void	invalidateMapBasedData ()
	Notification from model that information from associated map view has changed.
virtual bool	isEmbeddedInParent () const
virtual bool	isScaleOK (double scale) const
QgsLayerTreeLayer *	layerNode () const
	Returns pointer to the parent layer node.
QgsLayerTreeModel *	model () const
	Returns pointer to model owning this legend node.
virtual void	setColumnBreak (bool breakBeforeNode)
	Sets whether a forced column break should occur before the node.
virtual void	setEmbeddedInParent (bool embedded)
virtual void	setUserLabel (const QString &userLabel)
virtual void	setUserPatchSize (QSizeF size)
	Sets the user (overridden) size for the legend node.
virtual QString	userLabel () const
virtual QSizeF	userPatchSize () const
	Returns the user (overridden) size for the legend node.

Additional Inherited Members
Public Types inherited from QgsLayerTreeModelLegendNode
enum class	CustomRole : int { RuleKey = Qt::UserRole , ParentRuleKey , NodeType }
	Legend node data roles. More...
enum	NodeTypes {   SimpleLegend , SymbolLegend , RasterSymbolLegend , ImageLegend ,   WmsLegend , DataDefinedSizeLegend , EmbeddedWidget , ColorRampLegend }
	Types of legend nodes. More...
Public Slots inherited from QgsLayerTreeModelLegendNode
void	checkAllItems ()
	Checks all checkable items belonging to the same layer as this node.
void	toggleAllItems ()
	Toggle all checkable items belonging to the same layer as this node.
void	uncheckAllItems ()
	Unchecks all checkable items belonging to the same layer as this node.
Signals inherited from QgsLayerTreeModelLegendNode
void	dataChanged ()
	Emitted on internal data change so the layer tree model can forward the signal to views.
void	sizeChanged ()
	Emitted when the size of this node changes.
Protected Member Functions inherited from QgsLayerTreeModelLegendNode
	QgsLayerTreeModelLegendNode (QgsLayerTreeLayer *nodeL, QObject *parent=nullptr)
	Construct the node with pointer to its parent layer node.
QgsRenderContext *	createTemporaryRenderContext () const
	Returns a temporary context or nullptr if legendMapViewData are not valid.
Protected Attributes inherited from QgsLayerTreeModelLegendNode
bool	mColumnBreakBeforeNode = false
bool	mEmbeddedInParent
QgsLayerTreeLayer *	mLayerNode = nullptr
QgsLegendPatchShape	mPatchShape
QString	mUserLabel
QSizeF	mUserSize

Detailed Description

Implementation of legend node interface for displaying raster legend entries.

Definition at line 667 of file qgslayertreemodellegendnode.h.

Constructor & Destructor Documentation

QgsRasterSymbolLegendNode()

QgsRasterSymbolLegendNode::QgsRasterSymbolLegendNode	(	QgsLayerTreeLayer *	nodeLayer,
		const QColor &	color,
		const QString &	label,
		QObject *	parent = nullptr,
		bool	isCheckable = false,
		const QString &	ruleKey = QString()
	)

Constructor for QgsRasterSymbolLegendNode.

Parameters

nodeLayer	layer node
color	color
label	label
parent	attach a parent QObject to the legend node.
isCheckable	set to true to enable the checkbox for the node (since QGIS 3.18)
ruleKey	optional identifier to allow a unique ID to be assigned to the node by a renderer (since QGIS 3.18)

Definition at line 1072 of file qgslayertreemodellegendnode.cpp.

Member Function Documentation

data()

QVariant QgsRasterSymbolLegendNode::data ( int  role ) const

overridevirtual

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

Implements QgsLayerTreeModelLegendNode.

Definition at line 1089 of file qgslayertreemodellegendnode.cpp.

drawSymbol()

QSizeF QgsRasterSymbolLegendNode::drawSymbol ( const QgsLegendSettings &  settings, ItemContext *  ctx, double  itemHeight  ) const

overridevirtual

Draws symbol on the left side of the item.

Parameters

settings	Legend layout configuration
ctx	Context for rendering - may be nullptr if only doing layout without actual rendering
itemHeight	Minimal 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 from QgsLayerTreeModelLegendNode.

Definition at line 1163 of file qgslayertreemodellegendnode.cpp.

exportSymbolToJson()

QJsonObject QgsRasterSymbolLegendNode::exportSymbolToJson ( const QgsLegendSettings &  settings, const QgsRenderContext &  context  ) const

overridevirtual

Adds a symbol in base64 string within a JSON object with the key "icon".

Parameters

settings	Legend layout configuration
context	Rendering context

Since

QGIS 3.8

Reimplemented from QgsLayerTreeModelLegendNode.

Definition at line 1221 of file qgslayertreemodellegendnode.cpp.

flags()

Qt::ItemFlags QgsRasterSymbolLegendNode::flags ( ) const

overridevirtual

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

Reimplemented from QgsLayerTreeModelLegendNode.

Definition at line 1081 of file qgslayertreemodellegendnode.cpp.

isCheckable()

bool QgsRasterSymbolLegendNode::isCheckable ( ) const

inline

Returns whether the item is user-checkable - whether renderer supports enabling/disabling it.

Since

QGIS 3.18

Definition at line 702 of file qgslayertreemodellegendnode.h.

ruleKey()

QString QgsRasterSymbolLegendNode::ruleKey ( ) const

inline

Returns the unique identifier of node for identification of the item within renderer.

Since

QGIS 3.18

Definition at line 695 of file qgslayertreemodellegendnode.h.

setData()

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

overridevirtual

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

Reimplemented from QgsLayerTreeModelLegendNode.

Definition at line 1132 of file qgslayertreemodellegendnode.cpp.

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

• /home/fischer/src/qgis-3.38/src/core/layertree/qgslayertreemodellegendnode.h
• /home/fischer/src/qgis-3.38/src/core/layertree/qgslayertreemodellegendnode.cpp