#include <qgscategorizedsymbolrenderer.h>

Inheritance diagram for QgsCategorizedSymbolRenderer:

Public Member Functions
	QgsCategorizedSymbolRenderer (const QString &attrName=QString(), const QgsCategoryList &categories=QgsCategoryList())
	Constructor for QgsCategorizedSymbolRenderer. More...

void	addCategory (const QgsRendererCategory &category)
	Adds a new category to the renderer. More...

QgsFeatureRenderer::Capabilities	capabilities () override
	Returns details about internals of this renderer. More...

const QgsCategoryList &	categories () const
	Returns a list of all categories recognized by the renderer. More...

int	categoryIndexForLabel (const QString &val)
	Returns the index of the category with the specified label (or -1 if the label was not found, or is not unique). More...

int	categoryIndexForValue (const QVariant &val)
	Returns the index for the category with the specified value (or -1 if not found). More...

void	checkLegendSymbolItem (const QString &key, bool state=true) override
	item in symbology was checked More...

QString	classAttribute () const
	Returns the class attribute for the renderer, which is the field name or expression string from the layer which will be matched against the renderer categories. More...

QgsCategorizedSymbolRenderer *	clone () const override
	Create a deep copy of this renderer. More...

QgsDataDefinedSizeLegend *	dataDefinedSizeLegend () const
	Returns configuration of appearance of legend when using data-defined size for marker symbols. More...

void	deleteAllCategories ()
	Deletes all existing categories from the renderer. More...

bool	deleteCategory (int catIndex)
	Deletes the category with the specified index from the renderer. More...

QString	dump () const override
	Returns debug information about this renderer. More...

QString	filter (const QgsFields &fields=QgsFields()) override
	If a renderer does not require all the features this method may be overridden and return an expression used as where clause. More...

bool	filterNeedsGeometry () const override
	Returns true if this renderer requires the geometry to apply the filter. More...

QString	legendClassificationAttribute () const override
	If supported by the renderer, return classification attribute for the use in legend. More...

QSet< QString >	legendKeysForFeature (const QgsFeature &feature, QgsRenderContext &context) const override
	Returns legend keys matching a specified feature. More...

bool	legendSymbolItemChecked (const QString &key) override
	items of symbology items in legend is checked More...

QgsLegendSymbolList	legendSymbolItems () const override
	Returns a list of symbology items for the legend. More...

bool	legendSymbolItemsCheckable () const override
	items of symbology items in legend should be checkable More...

int	matchToSymbols (QgsStyle *style, QgsSymbol::SymbolType type, QVariantList &unmatchedCategories, QStringList &unmatchedSymbols, bool caseSensitive=true, bool useTolerantMatch=false)
	Replaces category symbols with the symbols from a style that have a matching name and symbol type. More...

void	moveCategory (int from, int to)
	Moves an existing category at index position from to index position to. More...

QgsSymbol *	originalSymbolForFeature (const QgsFeature &feature, QgsRenderContext &context) const override
	Returns symbol for feature. More...

QDomElement	save (QDomDocument &doc, const QgsReadWriteContext &context) override
	store renderer info to XML element More...

void	setClassAttribute (const QString &attr)
	Sets the class attribute for the renderer, which is the field name or expression string from the layer which will be matched against the renderer categories. More...

void	setDataDefinedSizeLegend (QgsDataDefinedSizeLegend *settings)
	Configures appearance of legend when renderer is configured to use data-defined size for marker symbols. More...

void	setLegendSymbolItem (const QString &key, QgsSymbol *symbol) override
	Sets the symbol to be used for a legend symbol item. More...

void	setSourceColorRamp (QgsColorRamp *ramp)
	Sets the source color ramp. More...

void	setSourceSymbol (QgsSymbol *sym)
	Sets the source symbol for the renderer, which is the base symbol used for the each categories' symbol before applying the categories' color. More...

void	sortByLabel (Qt::SortOrder order=Qt::AscendingOrder)
	Sorts the existing categories by their label. More...

void	sortByValue (Qt::SortOrder order=Qt::AscendingOrder)
	Sorts the existing categories by their value. More...

QgsColorRamp *	sourceColorRamp ()
	Returns the source color ramp, from which each categories' color is derived. More...

QgsSymbol *	sourceSymbol ()
	Returns the renderer's source symbol, which is the base symbol used for the each categories' symbol before applying the categories' color. More...

void	startRender (QgsRenderContext &context, const QgsFields &fields) override
	Must be called when a new render cycle is started. More...

void	stopRender (QgsRenderContext &context) override
	Must be called when a render cycle has finished, to allow the renderer to clean up. More...

QgsSymbol *	symbolForFeature (const QgsFeature &feature, QgsRenderContext &context) const override
	To be overridden. More...

QgsSymbolList	symbols (QgsRenderContext &context) const override
	Returns list of symbols used by the renderer. More...

void	toSld (QDomDocument &doc, QDomElement &element, const QgsStringMap &props=QgsStringMap()) const override
	used from subclasses to create SLD Rule elements following SLD v1.1 specs More...

bool	updateCategoryLabel (int catIndex, const QString &label)
	Changes the label for the category with the specified index. More...

bool	updateCategoryRenderState (int catIndex, bool render)
	Changes the render state for the category with the specified index. More...

bool	updateCategorySymbol (int catIndex, QgsSymbol *symbol)
	Changes the symbol for the category with the specified index. More...

bool	updateCategoryValue (int catIndex, const QVariant &value)
	Changes the value for the category with the specified index. More...

void	updateColorRamp (QgsColorRamp *ramp)
	Update the color ramp used and all symbols colors. More...

void	updateSymbols (QgsSymbol *sym)
	Update all the symbols but leave categories and colors. More...

QSet< QString >	usedAttributes (const QgsRenderContext &context) const override
	Returns a list of attributes required by this renderer. More...

Public Member Functions inherited from QgsFeatureRenderer
virtual	~QgsFeatureRenderer ()

virtual const QgsFeatureRenderer *	embeddedRenderer () const
	Returns the current embedded renderer (subrenderer) for this feature renderer. More...

bool	forceRasterRender () const
	Returns whether the renderer must render as a raster. More...

virtual void	modifyRequestExtent (QgsRectangle &extent, QgsRenderContext &context)
	Allows for a renderer to modify the extent of a feature request prior to rendering. More...

QgsFeatureRequest::OrderBy	orderBy () const
	Gets the order in which features shall be processed by this renderer. More...

bool	orderByEnabled () const
	Returns whether custom ordering will be applied before features are processed by this renderer. More...

virtual QgsSymbolList	originalSymbolsForFeature (const QgsFeature &feature, QgsRenderContext &context) const
	Equivalent of originalSymbolsForFeature() call extended to support renderers that may use more symbols per feature - similar to symbolsForFeature() More...

QgsPaintEffect *	paintEffect () const
	Returns the current paint effect for the renderer. More...

virtual bool	renderFeature (const QgsFeature &feature, QgsRenderContext &context, int layer=-1, bool selected=false, bool drawVertexMarker=false) SIP_THROW(QgsCsException)
	Render a feature using this renderer in the given context. More...

virtual void	setEmbeddedRenderer (QgsFeatureRenderer *subRenderer)
	Sets an embedded renderer (subrenderer) for this feature renderer. More...

void	setForceRasterRender (bool forceRaster)
	Sets whether the renderer should be rendered to a raster destination. More...

void	setOrderBy (const QgsFeatureRequest::OrderBy &orderBy)
	Define the order in which features shall be processed by this renderer. More...

void	setOrderByEnabled (bool enabled)
	Sets whether custom ordering should be applied before features are processed by this renderer. More...

void	setPaintEffect (QgsPaintEffect *effect)
	Sets the current paint effect for the renderer. More...

void	setUsingSymbolLevels (bool usingSymbolLevels)

void	setVertexMarkerAppearance (int type, double size)
	Sets type and size of editing vertex markers for subsequent rendering. More...

virtual QgsSymbolList	symbolsForFeature (const QgsFeature &feature, QgsRenderContext &context) const
	Returns list of symbols used for rendering the feature. More...

QString	type () const

bool	usingSymbolLevels () const

virtual bool	willRenderFeature (const QgsFeature &feature, QgsRenderContext &context) const
	Returns whether the renderer will render a feature or not. More...

virtual QDomElement	writeSld (QDomDocument &doc, const QString &styleName, const QgsStringMap &props=QgsStringMap()) const
	create the SLD UserStyle element following the SLD v1.1 specs with the given name More...

Static Public Member Functions
static QgsCategorizedSymbolRenderer *	convertFromRenderer (const QgsFeatureRenderer *renderer)
	creates a QgsCategorizedSymbolRenderer from an existing renderer. More...

static QgsFeatureRenderer *	create (QDomElement &element, const QgsReadWriteContext &context)
	Creates a categorized renderer from an XML element. More...

Static Public Member Functions inherited from QgsFeatureRenderer
static QgsFeatureRenderer *	defaultRenderer (QgsWkbTypes::GeometryType geomType)
	Returns a new renderer - used by default in vector layers. More...

static QgsFeatureRenderer *	load (QDomElement &symbologyElem, const QgsReadWriteContext &context)
	create a renderer from XML element More...

static QgsFeatureRenderer *	loadSld (const QDomNode &node, QgsWkbTypes::GeometryType geomType, QString &errorMessage)
	Create a new renderer according to the information contained in the UserStyle element of a SLD style document. More...

Protected Member Functions
void	rebuildHash ()

Q_DECL_DEPRECATED QgsSymbol *	skipRender ()

Q_DECL_DEPRECATED QgsSymbol *	symbolForValue (const QVariant &value) const
	Returns the matching symbol corresponding to an attribute value. More...

QgsSymbol *	symbolForValue (const QVariant &value, bool &foundMatchingSymbol) const
	Returns the matching symbol corresponding to an attribute value. More...

Protected Member Functions inherited from QgsFeatureRenderer
	QgsFeatureRenderer (const QString &type)

void	copyRendererData (QgsFeatureRenderer *destRenderer) const
	Clones generic renderer data to another renderer. More...

void	renderFeatureWithSymbol (const QgsFeature &feature, QgsSymbol *symbol, QgsRenderContext &context, int layer, bool selected, bool drawVertexMarker) SIP_THROW(QgsCsException)
	Render the feature with the symbol using context. More...

void	renderVertexMarker (QPointF pt, QgsRenderContext &context)
	render editing vertex marker at specified point More...

void	renderVertexMarkerPolygon (QPolygonF &pts, QList< QPolygonF > *rings, QgsRenderContext &context)
	render editing vertex marker for a polygon More...

void	renderVertexMarkerPolyline (QPolygonF &pts, QgsRenderContext &context)
	render editing vertex marker for a polyline More...

Protected Attributes
QString	mAttrName

int	mAttrNum = -1
	attribute index (derived from attribute name in startRender) More...

QgsCategoryList	mCategories

bool	mCounting = false

std::unique_ptr< QgsDataDefinedSizeLegend >	mDataDefinedSizeLegend

std::unique_ptr< QgsExpression >	mExpression

std::unique_ptr< QgsColorRamp >	mSourceColorRamp

std::unique_ptr< QgsSymbol >	mSourceSymbol

QHash< QString, QgsSymbol * >	mSymbolHash
	hashtable for faster access to symbols More...

Protected Attributes inherited from QgsFeatureRenderer
double	mCurrentVertexMarkerSize
	The current size of editing marker. More...

int	mCurrentVertexMarkerType
	The current type of editing marker. More...

bool	mForceRaster

QgsFeatureRequest::OrderBy	mOrderBy

bool	mOrderByEnabled

QgsPaintEffect *	mPaintEffect = nullptr

QString	mType

bool	mUsingSymbolLevels

Additional Inherited Members
Public Types inherited from QgsFeatureRenderer
enum	Capability { SymbolLevels = 1, MoreSymbolsPerFeature = 1 << 2, Filter = 1 << 3, ScaleDependent = 1 << 4 }
	Used to specify details about a renderer. More...

Static Protected Member Functions inherited from QgsFeatureRenderer
static QPointF	_getPoint (QgsRenderContext &context, const QgsPoint &point)
	Creates a point in screen coordinates from a wkb string in map coordinates. More...

static void	convertSymbolRotation (QgsSymbol *symbol, const QString &field)

static void	convertSymbolSizeScale (QgsSymbol *symbol, QgsSymbol::ScaleMethod method, const QString &field)

Detailed Description

Definition at line 143 of file qgscategorizedsymbolrenderer.h.

Constructor & Destructor Documentation

QgsCategorizedSymbolRenderer::QgsCategorizedSymbolRenderer	(	const QString &	attrName = `QString()`,
		const QgsCategoryList &	categories = `QgsCategoryList()`
	)

Constructor for QgsCategorizedSymbolRenderer.

The attrName argument specifies the layer's field name, or expression, which the categories will be matched against.

A list of renderer categories can optionally be specified. If no categories are specified in the constructor, they can be added later by calling addCategory().

Definition at line 159 of file qgscategorizedsymbolrenderer.cpp.

Member Function Documentation

void QgsCategorizedSymbolRenderer::addCategory ( const QgsRendererCategory & category )

Adds a new category to the renderer.

See also: categories()

Definition at line 321 of file qgscategorizedsymbolrenderer.cpp.

QgsFeatureRenderer::Capabilities QgsCategorizedSymbolRenderer::capabilities ( )

inlineoverridevirtual

Returns details about internals of this renderer.

E.g. if you only want to deal with visible features:

 if not renderer.capabilities().testFlag(QgsFeatureRenderer.Filter) or renderer.willRenderFeature(feature, context):
     deal_with_my_feature()
 else:
     skip_the_curren_feature()

Reimplemented from QgsFeatureRenderer.

Definition at line 166 of file qgscategorizedsymbolrenderer.h.

const QgsCategoryList& QgsCategorizedSymbolRenderer::categories ( ) const

inline

Returns a list of all categories recognized by the renderer.

Definition at line 181 of file qgscategorizedsymbolrenderer.h.

int QgsCategorizedSymbolRenderer::categoryIndexForLabel ( const QString & val )

Returns the index of the category with the specified label (or -1 if the label was not found, or is not unique).

Since: QGIS 2.5

Definition at line 273 of file qgscategorizedsymbolrenderer.cpp.

int QgsCategorizedSymbolRenderer::categoryIndexForValue ( const QVariant & val )

Returns the index for the category with the specified value (or -1 if not found).

Definition at line 263 of file qgscategorizedsymbolrenderer.cpp.

void QgsCategorizedSymbolRenderer::checkLegendSymbolItem	(	const QString &	key,
		bool	state = `true`
	)

overridevirtual

item in symbology was checked

Since: QGIS 2.5

Reimplemented from QgsFeatureRenderer.

Definition at line 916 of file qgscategorizedsymbolrenderer.cpp.

QString QgsCategorizedSymbolRenderer::classAttribute ( ) const

inline

Returns the class attribute for the renderer, which is the field name or expression string from the layer which will be matched against the renderer categories.

See also: setClassAttribute()

Definition at line 287 of file qgscategorizedsymbolrenderer.h.

QgsCategorizedSymbolRenderer * QgsCategorizedSymbolRenderer::clone ( ) const

overridevirtual

Create a deep copy of this renderer.

Should be implemented by all subclasses and generate a proper subclass.

Returns: A copy of this renderer

Implements QgsFeatureRenderer.

Definition at line 476 of file qgscategorizedsymbolrenderer.cpp.

QgsCategorizedSymbolRenderer * QgsCategorizedSymbolRenderer::convertFromRenderer ( const QgsFeatureRenderer * renderer )

static

creates a QgsCategorizedSymbolRenderer from an existing renderer.

Returns: a new renderer if the conversion was possible, otherwise 0.

Since: QGIS 2.5

Definition at line 924 of file qgscategorizedsymbolrenderer.cpp.

QgsFeatureRenderer * QgsCategorizedSymbolRenderer::create	(	QDomElement &	element,
		const QgsReadWriteContext &	context
	)

static

Creates a categorized renderer from an XML element.

Definition at line 587 of file qgscategorizedsymbolrenderer.cpp.

QgsDataDefinedSizeLegend * QgsCategorizedSymbolRenderer::dataDefinedSizeLegend ( ) const

Returns configuration of appearance of legend when using data-defined size for marker symbols.

Will return null if the functionality is disabled.

Since: QGIS 3.0

Definition at line 969 of file qgscategorizedsymbolrenderer.cpp.

void QgsCategorizedSymbolRenderer::deleteAllCategories ( )

Deletes all existing categories from the renderer.

See also: deleteCategory()

Definition at line 341 of file qgscategorizedsymbolrenderer.cpp.

bool QgsCategorizedSymbolRenderer::deleteCategory ( int catIndex )

Deletes the category with the specified index from the renderer.

See also: deleteAllCategories()

Definition at line 332 of file qgscategorizedsymbolrenderer.cpp.

QString QgsCategorizedSymbolRenderer::dump ( ) const

overridevirtual

Returns debug information about this renderer.

Reimplemented from QgsFeatureRenderer.

Definition at line 468 of file qgscategorizedsymbolrenderer.cpp.

QString QgsCategorizedSymbolRenderer::filter ( const QgsFields & fields = QgsFields() )

overridevirtual

If a renderer does not require all the features this method may be overridden and return an expression used as where clause.

This will be called once after startRender() and before the first call to renderFeature(). By default this returns a null string and all features will be requested. You do not need to specify the extent in here, this is taken care of separately and will be combined with a filter returned from this method.

Returns: An expression used as where clause

Reimplemented from QgsFeatureRenderer.

Definition at line 504 of file qgscategorizedsymbolrenderer.cpp.

bool QgsCategorizedSymbolRenderer::filterNeedsGeometry ( ) const

overridevirtual

Returns true if this renderer requires the geometry to apply the filter.

Reimplemented from QgsFeatureRenderer.

Definition at line 455 of file qgscategorizedsymbolrenderer.cpp.

QString QgsCategorizedSymbolRenderer::legendClassificationAttribute ( ) const

inlineoverridevirtual

If supported by the renderer, return classification attribute for the use in legend.

Since: QGIS 2.6

Reimplemented from QgsFeatureRenderer.

Definition at line 350 of file qgscategorizedsymbolrenderer.h.

QSet< QString > QgsCategorizedSymbolRenderer::legendKeysForFeature	(	const QgsFeature &	feature,
		QgsRenderContext &	context
	)		const

overridevirtual

Returns legend keys matching a specified feature.

Since: QGIS 2.14

Reimplemented from QgsFeatureRenderer.

Definition at line 817 of file qgscategorizedsymbolrenderer.cpp.

bool QgsCategorizedSymbolRenderer::legendSymbolItemChecked ( const QString & key )

overridevirtual

items of symbology items in legend is checked

Since: QGIS 2.5

Reimplemented from QgsFeatureRenderer.

Definition at line 896 of file qgscategorizedsymbolrenderer.cpp.

QgsLegendSymbolList QgsCategorizedSymbolRenderer::legendSymbolItems ( ) const

overridevirtual

Returns a list of symbology items for the legend.

Since: QGIS 2.6

Reimplemented from QgsFeatureRenderer.

Definition at line 777 of file qgscategorizedsymbolrenderer.cpp.

bool QgsCategorizedSymbolRenderer::legendSymbolItemsCheckable ( ) const

overridevirtual

items of symbology items in legend should be checkable

Since: QGIS 2.5

Reimplemented from QgsFeatureRenderer.

Definition at line 891 of file qgscategorizedsymbolrenderer.cpp.

int QgsCategorizedSymbolRenderer::matchToSymbols	(	QgsStyle *	style,
		QgsSymbol::SymbolType	type,
		QVariantList &	unmatchedCategories,
		QStringList &	unmatchedSymbols,
		bool	caseSensitive = `true`,
		bool	useTolerantMatch = `false`
	)

Replaces category symbols with the symbols from a style that have a matching name and symbol type.

The unmatchedCategories list will be filled with all existing categories which could not be matched to a symbol in style.

The unmatchedSymbols list will be filled with all symbol names from style which were not matched to an existing category.

If caseSensitive is false, then a case-insensitive match will be performed. If useTolerantMatch is true, then non-alphanumeric characters in style and category names will be ignored during the match.

Returns the count of symbols matched.

Since: QGIS 3.4

Definition at line 974 of file qgscategorizedsymbolrenderer.cpp.

void QgsCategorizedSymbolRenderer::moveCategory	(	int	from,
		int	to
	)

Moves an existing category at index position from to index position to.

Definition at line 346 of file qgscategorizedsymbolrenderer.cpp.

QgsSymbol * QgsCategorizedSymbolRenderer::originalSymbolForFeature	(	const QgsFeature &	feature,
		QgsRenderContext &	context
	)		const

overridevirtual

Returns symbol for feature.

The difference compared to symbolForFeature() is that it returns original symbol which can be used as an identifier for renderer's rule - the former may return a temporary replacement of a symbol for use in rendering.

Since: QGIS 2.12

Reimplemented from QgsFeatureRenderer.

Definition at line 245 of file qgscategorizedsymbolrenderer.cpp.

void QgsCategorizedSymbolRenderer::rebuildHash ( )

protected

Definition at line 176 of file qgscategorizedsymbolrenderer.cpp.

QDomElement QgsCategorizedSymbolRenderer::save	(	QDomDocument &	doc,
		const QgsReadWriteContext &	context
	)

overridevirtual

store renderer info to XML element

Reimplemented from QgsFeatureRenderer.

Definition at line 684 of file qgscategorizedsymbolrenderer.cpp.

void QgsCategorizedSymbolRenderer::setClassAttribute ( const QString & attr )

inline

Sets the class attribute for the renderer, which is the field name or expression string from the layer which will be matched against the renderer categories.

See also: classAttribute()

Definition at line 296 of file qgscategorizedsymbolrenderer.h.

void QgsCategorizedSymbolRenderer::setDataDefinedSizeLegend ( QgsDataDefinedSizeLegend * settings )

Configures appearance of legend when renderer is configured to use data-defined size for marker symbols.

This allows configuring for which values (symbol sizes) should be shown in the legend, whether to display different symbol sizes collapsed in one legend node or separated across multiple legend nodes etc.

When renderer does not use data-defined size or does not use marker symbols, these settings will be ignored. Takes ownership of the passed settings objects. Null pointer is a valid input that disables data-defined size legend.

Since: QGIS 3.0

Definition at line 964 of file qgscategorizedsymbolrenderer.cpp.

void QgsCategorizedSymbolRenderer::setLegendSymbolItem	(	const QString &	key,
		QgsSymbol *	symbol
	)

overridevirtual

Sets the symbol to be used for a legend symbol item.

Parameters

key	rule key for legend symbol
symbol	new symbol for legend item. Ownership is transferred to renderer.

Since: QGIS 2.14

Reimplemented from QgsFeatureRenderer.

Definition at line 906 of file qgscategorizedsymbolrenderer.cpp.

void QgsCategorizedSymbolRenderer::setSourceColorRamp ( QgsColorRamp * ramp )

Sets the source color ramp.

Parameters

ramp	color ramp. Ownership is transferred to the renderer

See also: sourceColorRamp(); setSourceSymbol()

Definition at line 851 of file qgscategorizedsymbolrenderer.cpp.

void QgsCategorizedSymbolRenderer::setSourceSymbol ( QgsSymbol * sym )

Sets the source symbol for the renderer, which is the base symbol used for the each categories' symbol before applying the categories' color.

Parameters

sym	source symbol, ownership is transferred to the renderer

See also: sourceSymbol(); setSourceColorRamp()

Definition at line 841 of file qgscategorizedsymbolrenderer.cpp.

QgsSymbol * QgsCategorizedSymbolRenderer::skipRender ( )

protected

Deprecated:: No longer used, will be removed in QGIS 4.0

Definition at line 187 of file qgscategorizedsymbolrenderer.cpp.

void QgsCategorizedSymbolRenderer::sortByLabel ( Qt::SortOrder order = Qt::AscendingOrder )

Sorts the existing categories by their label.

See also: sortByValue()

Definition at line 383 of file qgscategorizedsymbolrenderer.cpp.

void QgsCategorizedSymbolRenderer::sortByValue ( Qt::SortOrder order = Qt::AscendingOrder )

Sorts the existing categories by their value.

See also: sortByLabel()

Definition at line 361 of file qgscategorizedsymbolrenderer.cpp.

QgsColorRamp * QgsCategorizedSymbolRenderer::sourceColorRamp ( )

Returns the source color ramp, from which each categories' color is derived.

See also: setSourceColorRamp(); sourceSymbol()

Definition at line 846 of file qgscategorizedsymbolrenderer.cpp.

QgsSymbol * QgsCategorizedSymbolRenderer::sourceSymbol ( )

Returns the renderer's source symbol, which is the base symbol used for the each categories' symbol before applying the categories' color.

See also: setSourceSymbol(); sourceColorRamp()

Definition at line 837 of file qgscategorizedsymbolrenderer.cpp.

void QgsCategorizedSymbolRenderer::startRender	(	QgsRenderContext &	context,
		const QgsFields &	fields
	)

overridevirtual

Must be called when a new render cycle is started.

A call to startRender() must always be followed by a corresponding call to stopRender() after all features have been rendered.

Parameters

context	Additional information passed to the renderer about the job which will be rendered
fields	The fields available for rendering

See also: stopRender()

Warning: This method is not thread safe. Before calling startRender() in a non-main thread, the renderer should instead be cloned and startRender()/stopRender() called on the clone.

Reimplemented from QgsFeatureRenderer.

Definition at line 395 of file qgscategorizedsymbolrenderer.cpp.

void QgsCategorizedSymbolRenderer::stopRender ( QgsRenderContext & context )

overridevirtual

Must be called when a render cycle has finished, to allow the renderer to clean up.

Calls to stopRender() must always be preceded by a call to startRender().

Warning: This method is not thread safe. Before calling startRender() in a non-main thread, the renderer should instead be cloned and startRender()/stopRender() called on the clone.

See also: startRender()

Reimplemented from QgsFeatureRenderer.

Definition at line 418 of file qgscategorizedsymbolrenderer.cpp.

QgsSymbol * QgsCategorizedSymbolRenderer::symbolForFeature	(	const QgsFeature &	feature,
		QgsRenderContext &	context
	)		const

overridevirtual

To be overridden.

Must be called between startRender() and stopRender() calls.

Parameters

feature	feature
context	render context

Returns: returns pointer to symbol or 0 if symbol was not found

Since: QGIS 2.12

Implements QgsFeatureRenderer.

Definition at line 222 of file qgscategorizedsymbolrenderer.cpp.

QgsSymbol * QgsCategorizedSymbolRenderer::symbolForValue ( const QVariant & value ) const

protected

Returns the matching symbol corresponding to an attribute value.

Deprecated:: use variant which takes a second bool argument instead.

Definition at line 192 of file qgscategorizedsymbolrenderer.cpp.

QgsSymbol * QgsCategorizedSymbolRenderer::symbolForValue	(	const QVariant &	value,
		bool &	foundMatchingSymbol
	)		const

protected

Returns the matching symbol corresponding to an attribute value.

Will return nullptr if no matching symbol was found for value, or if the category corresponding to value is currently disabled (see QgsRendererCategory::renderState()).

If foundMatchingSymbol is specified then it will be set to true if a matching category was found. This can be used to differentiate between a nullptr returned as a result of no matching category vs a nullptr as a result of disabled categories.

Note: available in Python bindings as symbolForValue2

Definition at line 198 of file qgscategorizedsymbolrenderer.cpp.

QgsSymbolList QgsCategorizedSymbolRenderer::symbols ( QgsRenderContext & context ) const

overridevirtual

Returns list of symbols used by the renderer.

Parameters

context render context

Since: QGIS 2.12

Reimplemented from QgsFeatureRenderer.

Definition at line 575 of file qgscategorizedsymbolrenderer.cpp.

void QgsCategorizedSymbolRenderer::toSld	(	QDomDocument &	doc,
		QDomElement &	element,
		const QgsStringMap &	props = `QgsStringMap()`
	)		const

overridevirtual

used from subclasses to create SLD Rule elements following SLD v1.1 specs

Reimplemented from QgsFeatureRenderer.

Definition at line 492 of file qgscategorizedsymbolrenderer.cpp.

bool QgsCategorizedSymbolRenderer::updateCategoryLabel	(	int	catIndex,
		const QString &	label
	)

Changes the label for the category with the specified index.

A category's label is used to represent the category within legends and the layer tree.

See also: updateCategoryValue(); updateCategoryLabel(); updateCategoryRenderState()

Definition at line 305 of file qgscategorizedsymbolrenderer.cpp.

bool QgsCategorizedSymbolRenderer::updateCategoryRenderState	(	int	catIndex,
		bool	render
	)

Changes the render state for the category with the specified index.

The render state indicates whether or not the category will be rendered, and is reflected in whether the category is checked with the project's layer tree.