Implementation of legend node interface for displaying arbitrary raster image. More...

#include <qgslayertreemodellegendnode.h>

Inheritance diagram for QgsImageLegendNode:

[legend]

Public Member Functions
	QgsImageLegendNode (QgsLayerTreeLayer nodeLayer, const QImage &img, QObject parent=nullptr)
	Constructor for QgsImageLegendNode.

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".

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 Qt::ItemFlags	flags () const
	Returns item flags associated with the item. Default implementation returns Qt::ItemIsEnabled.

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 bool	setData (const QVariant &value, int role)
	Sets some data associated with the item. Default implementation does nothing and returns `false`.

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 arbitrary raster image.

Definition at line 630 of file qgslayertreemodellegendnode.h.

Constructor & Destructor Documentation

◆ QgsImageLegendNode()

QgsImageLegendNode::QgsImageLegendNode	(	QgsLayerTreeLayer *	nodeLayer,
		const QImage &	img,
		QObject *	parent = `nullptr`
	)

Constructor for QgsImageLegendNode.

Parameters

nodeLayer	layer node
img	the image
parent	attach a parent QObject to the legend node.

Definition at line 1008 of file qgslayertreemodellegendnode.cpp.

Member Function Documentation

◆ data()

QVariant QgsImageLegendNode::data ( int role ) const

overridevirtual

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

Implements QgsLayerTreeModelLegendNode.

Definition at line 1014 of file qgslayertreemodellegendnode.cpp.

◆ drawSymbol()

QSizeF QgsImageLegendNode::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