QGIS API Documentation
2.2.0-Valmiera
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A abstract base class for defining QgsExpression functions. More...
#include <qgsexpression.h>
Public Member Functions | |
Function (QString fnname, int params, QString group, QString helpText=QString(), bool usesGeometry=false) | |
QString | name () |
The name of the function. | |
int | params () |
The number of parameters this function takes. | |
bool | usesgeometry () |
Does this function use a geometry object. | |
QString | group () |
The group the function belongs to. | |
QString | helptext () |
The help text for the function. | |
virtual QVariant | func (const QVariantList &values, const QgsFeature *f, QgsExpression *parent)=0 |
bool | operator== (const Function &other) const |
Private Attributes | |
QString | mName |
int | mParams |
bool | mUsesGeometry |
QString | mGroup |
QString | mHelpText |
A abstract base class for defining QgsExpression functions.
Definition at line 241 of file qgsexpression.h.
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inline |
Definition at line 244 of file qgsexpression.h.
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pure virtual |
Implemented in QgsExpression::StaticFunction.
Referenced by QgsExpression::NodeFunction::eval().
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inline |
The group the function belongs to.
Definition at line 253 of file qgsexpression.h.
Referenced by QgsExpressionBuilderWidget::QgsExpressionBuilderWidget().
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inline |
The help text for the function.
Definition at line 255 of file qgsexpression.h.
References QgsExpression::helptext().
Referenced by QgsExpressionBuilderWidget::QgsExpressionBuilderWidget().
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inline |
The name of the function.
Definition at line 247 of file qgsexpression.h.
Referenced by QgsExpression::NodeFunction::dump(), QgsExpression::NodeFunction::eval(), QgsOgcUtils::expressionFunctionToOgcFilter(), geometryFromConstExpr(), isGeometryColumn(), QgsOgcUtils::nodeFunctionFromOgcFilter(), and QgsExpressionBuilderWidget::QgsExpressionBuilderWidget().
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inline |
Definition at line 259 of file qgsexpression.h.
References mName.
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inline |
The number of parameters this function takes.
Definition at line 249 of file qgsexpression.h.
Referenced by QgsExpression::NodeFunction::dump(), QgsOgcUtils::expressionFunctionToOgcFilter(), and QgsExpressionBuilderWidget::QgsExpressionBuilderWidget().
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inline |
Does this function use a geometry object.
Definition at line 251 of file qgsexpression.h.
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private |
Definition at line 271 of file qgsexpression.h.
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private |
Definition at line 272 of file qgsexpression.h.
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private |
Definition at line 268 of file qgsexpression.h.
Referenced by operator==().
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private |
Definition at line 269 of file qgsexpression.h.
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private |
Definition at line 270 of file qgsexpression.h.