QgsSymbolWidgetContext Class Reference

Contains settings which reflect the context in which a symbol (or renderer) widget is shown, e.g., the map canvas and relevant expression contexts. More...

#include <qgssymbolwidgetcontext.h>

Public Member Functions
	QgsSymbolWidgetContext ()=default
	Constructor for QgsSymbolWidgetContext. More...
	QgsSymbolWidgetContext (const QgsSymbolWidgetContext &other)
	Copy constructor. More...
QList< QgsExpressionContextScope >	additionalExpressionContextScopes () const
	Returns the list of additional expression context scopes to show as available within the layer. More...
QgsExpressionContext *	expressionContext () const
	Returns the expression context used for the widget, if set. More...
QList< QgsExpressionContextScope * >	globalProjectAtlasMapLayerScopes (const QgsMapLayer *layer) const
	Returns list of scopes: global, project, atlas, map, layer. More...
QgsMapCanvas *	mapCanvas () const
	Returns the map canvas associated with the widget. More...
QgsSymbolWidgetContext &	operator= (const QgsSymbolWidgetContext &other)
void	setAdditionalExpressionContextScopes (const QList< QgsExpressionContextScope > &scopes)
	Sets a list of additional expression context scopes to show as available within the layer. More...
void	setExpressionContext (QgsExpressionContext *context)
	Sets the optional expression context used for the widget. More...
void	setMapCanvas (QgsMapCanvas *canvas)
	Sets the map canvas associated with the widget. More...

Detailed Description

Contains settings which reflect the context in which a symbol (or renderer) widget is shown, e.g., the map canvas and relevant expression contexts.

Since

QGIS 3.0

Definition at line 35 of file qgssymbolwidgetcontext.h.

Constructor & Destructor Documentation

QgsSymbolWidgetContext::QgsSymbolWidgetContext ( )

default

Constructor for QgsSymbolWidgetContext.

QgsSymbolWidgetContext::QgsSymbolWidgetContext

(

const QgsSymbolWidgetContext &

other

)

Copy constructor.

Parameters

other

source QgsSymbolWidgetContext

Definition at line 19 of file qgssymbolwidgetcontext.cpp.

Member Function Documentation

QList< QgsExpressionContextScope > QgsSymbolWidgetContext::additionalExpressionContextScopes

(

)

const

Returns the list of additional expression context scopes to show as available within the layer.

See also

setAdditionalExpressionContextScopes()

Definition at line 72 of file qgssymbolwidgetcontext.cpp.

QgsExpressionContext * QgsSymbolWidgetContext::expressionContext

(

)

const

Returns the expression context used for the widget, if set.

This expression context is used for evaluating data defined symbol properties and for populating based expression widgets in the layer widget.

See also

setExpressionContext()

Definition at line 62 of file qgssymbolwidgetcontext.cpp.

QList< QgsExpressionContextScope * > QgsSymbolWidgetContext::globalProjectAtlasMapLayerScopes

(

const QgsMapLayer *

layer

)

const

Returns list of scopes: global, project, atlas, map, layer.

Ownership is transferred to the caller.

Since

QGIS 3.0

Definition at line 77 of file qgssymbolwidgetcontext.cpp.

QgsMapCanvas * QgsSymbolWidgetContext::mapCanvas

(

)

const

Returns the map canvas associated with the widget.

See also

setMapCanvas()

Definition at line 49 of file qgssymbolwidgetcontext.cpp.

QgsSymbolWidgetContext & QgsSymbolWidgetContext::operator=

(

const QgsSymbolWidgetContext &

other

)

Definition at line 29 of file qgssymbolwidgetcontext.cpp.

void QgsSymbolWidgetContext::setAdditionalExpressionContextScopes

(

const QList< QgsExpressionContextScope > &

scopes

)

Sets a list of additional expression context scopes to show as available within the layer.

Parameters

scopes

list of additional scopes which will be added in order to the end of the default expression context

See also

setExpressionContext()

Definition at line 67 of file qgssymbolwidgetcontext.cpp.

void QgsSymbolWidgetContext::setExpressionContext

(

QgsExpressionContext *

context

)

Sets the optional expression context used for the widget.

This expression context is used for evaluating data defined symbol properties and for populating based expression widgets in the layer widget.

Parameters

context

expression context pointer. Ownership is not transferred.

See also

expressionContext()

setAdditionalExpressionContextScopes()

Definition at line 54 of file qgssymbolwidgetcontext.cpp.

void QgsSymbolWidgetContext::setMapCanvas

(

QgsMapCanvas *

canvas

)

Sets the map canvas associated with the widget.

This allows the widget to retrieve the current map scale and other properties from the canvas.

Parameters

canvas

map canvas

See also

mapCanvas()

Definition at line 44 of file qgssymbolwidgetcontext.cpp.

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

• /build/qgis-3.4.15+24xenial/src/gui/symbology/qgssymbolwidgetcontext.h
• /build/qgis-3.4.15+24xenial/src/gui/symbology/qgssymbolwidgetcontext.cpp