QGIS API Documentation 3.40.0-Bratislava (b56115d8743)
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An expression parameter for processing algorithms. More...
#include <qgsprocessingparameters.h>
Public Member Functions | |
QgsProcessingParameterExpression (const QString &name, const QString &description=QString(), const QVariant &defaultValue=QVariant(), const QString &parentLayerParameterName=QString(), bool optional=false, Qgis::ExpressionType type=Qgis::ExpressionType::Qgis) | |
Constructor for QgsProcessingParameterExpression. | |
QString | asPythonString (QgsProcessing::PythonOutputType outputType=QgsProcessing::PythonOutputType::PythonQgsProcessingAlgorithmSubclass) const override |
Returns the parameter definition as a Python command which can be used within a Python Processing script. | |
QgsProcessingParameterDefinition * | clone () const override |
Creates a clone of the parameter definition. | |
QStringList | dependsOnOtherParameters () const override |
Returns a list of other parameter names on which this parameter is dependent (e.g. | |
Qgis::ExpressionType | expressionType () const |
Returns the parameter's expression type. | |
bool | fromVariantMap (const QVariantMap &map) override |
Restores this parameter to a QVariantMap. | |
QString | parentLayerParameterName () const |
Returns the name of the parent layer parameter, or an empty string if this is not set. | |
void | setExpressionType (Qgis::ExpressionType type) |
Sets the parameter's expression type. | |
void | setParentLayerParameterName (const QString &parentLayerParameterName) |
Sets the name of the parent layer parameter. | |
QVariantMap | toVariantMap () const override |
Saves this parameter to a QVariantMap. | |
QString | type () const override |
Unique parameter type name. | |
QString | valueAsPythonString (const QVariant &value, QgsProcessingContext &context) const override |
Returns a string version of the parameter input value, which is suitable for use as an input parameter value when running an algorithm directly from a Python command. | |
Public Member Functions inherited from QgsProcessingParameterDefinition | |
QgsProcessingParameterDefinition (const QString &name, const QString &description=QString(), const QVariant &defaultValue=QVariant(), bool optional=false, const QString &help=QString()) | |
Constructor for QgsProcessingParameterDefinition. | |
virtual | ~QgsProcessingParameterDefinition ()=default |
QStringList | additionalExpressionContextVariables () const |
Returns a list of additional expression context variables which are available for use when evaluating this parameter. | |
QgsProcessingAlgorithm * | algorithm () const |
Returns a pointer to the algorithm which owns this parameter. | |
virtual QString | asScriptCode () const |
Returns the parameter definition encoded in a string which can be used within a Processing script. | |
virtual bool | checkValueIsAcceptable (const QVariant &input, QgsProcessingContext *context=nullptr) const |
Checks whether the specified input value is acceptable for the parameter. | |
QVariant | defaultValue () const |
Returns the default value for the parameter. | |
QVariant | defaultValueForGui () const |
Returns the default value to use for the parameter in a GUI. | |
QString | description () const |
Returns the description for the parameter. | |
QString | dynamicLayerParameterName () const |
Returns the name of the parameter for a layer linked to a dynamic parameter, or an empty string if this is not set. | |
QgsPropertyDefinition | dynamicPropertyDefinition () const |
Returns the property definition for dynamic properties. | |
Qgis::ProcessingParameterFlags | flags () const |
Returns any flags associated with the parameter. | |
QVariant | guiDefaultValueOverride () const |
Returns the default value to use in the GUI for the parameter. | |
QString | help () const |
Returns the help for the parameter. | |
virtual bool | isDestination () const |
Returns true if this parameter represents a file or layer destination, e.g. | |
bool | isDynamic () const |
Returns true if the parameter supports is dynamic, and can support data-defined values (i.e. | |
QVariantMap & | metadata () |
Returns the parameter's freeform metadata. | |
QVariantMap | metadata () const |
Returns the parameter's freeform metadata. | |
QString | name () const |
Returns the name of the parameter. | |
QgsProcessingProvider * | provider () const |
Returns a pointer to the provider for the algorithm which owns this parameter. | |
void | setAdditionalExpressionContextVariables (const QStringList &variables) |
Sets a list of additional expression context variables which are available for use when evaluating this parameter. | |
void | setDefaultValue (const QVariant &value) |
Sets the default value for the parameter. | |
void | setDescription (const QString &description) |
Sets the description for the parameter. | |
void | setDynamicLayerParameterName (const QString &name) |
Sets the name for the parameter for a layer linked to a dynamic parameter, or an empty string if this is not set. | |
void | setDynamicPropertyDefinition (const QgsPropertyDefinition &definition) |
Sets the property definition for dynamic properties. | |
void | setFlags (Qgis::ProcessingParameterFlags flags) |
Sets the flags associated with the parameter. | |
void | setGuiDefaultValueOverride (const QVariant &value) |
Sets the default value to use for the parameter in GUI widgets. | |
void | setHelp (const QString &help) |
Sets the help for the parameter. | |
void | setIsDynamic (bool dynamic) |
Sets whether the parameter is dynamic, and can support data-defined values (i.e. | |
void | setMetadata (const QVariantMap &metadata) |
Sets the parameter's freeform metadata. | |
void | setName (const QString &name) |
Sets the name of the parameter. | |
virtual QString | toolTip () const |
Returns a formatted tooltip for use with the parameter, which gives helpful information like parameter description, ID, and extra content like default values (depending on parameter type). | |
virtual QVariant | valueAsJsonObject (const QVariant &value, QgsProcessingContext &context) const |
Returns a version of the parameter input value, which is suitable for use in a JSON object. | |
virtual QString | valueAsPythonComment (const QVariant &value, QgsProcessingContext &context) const |
Returns a Python comment explaining a parameter value, or an empty string if no comment is required. | |
virtual QString | valueAsString (const QVariant &value, QgsProcessingContext &context, bool &ok) const |
Returns a string version of the parameter input value (if possible). | |
virtual QStringList | valueAsStringList (const QVariant &value, QgsProcessingContext &context, bool &ok) const |
Returns a string list version of the parameter input value (if possible). | |
Static Public Member Functions | |
static QgsProcessingParameterExpression * | fromScriptCode (const QString &name, const QString &description, bool isOptional, const QString &definition) |
Creates a new parameter using the definition from a script code. | |
static QString | typeName () |
Returns the type name for the parameter class. | |
Additional Inherited Members | |
Public Types inherited from QgsProcessingParameterDefinition | |
enum class | ValueAsStringFlag : int { AllowMapLayerValues = 1 << 0 } |
Flags for passing to the valueAsStringPrivate() method. More... | |
typedef QFlags< ValueAsStringFlag > | ValueAsStringFlags |
Protected Member Functions inherited from QgsProcessingParameterDefinition | |
QVariant | defaultGuiValueFromSetting () const |
Default gui value for an algorithm parameter from settings. | |
QVariant | valueAsJsonObjectPrivate (const QVariant &value, QgsProcessingContext &context, ValueAsStringFlags flags) const |
Internal method for evaluating values as JSON objects. | |
QString | valueAsStringPrivate (const QVariant &value, QgsProcessingContext &context, bool &ok, ValueAsStringFlags flags) const |
Internal method for evaluating values as string. | |
Protected Attributes inherited from QgsProcessingParameterDefinition | |
QStringList | mAdditionalExpressionVariables |
Additional expression context variables exposed for use by this parameter. | |
QgsProcessingAlgorithm * | mAlgorithm = nullptr |
Pointer to algorithm which owns this parameter. | |
QVariant | mDefault |
Default value for parameter. | |
QString | mDescription |
Parameter description. | |
QString | mDynamicLayerParameterName |
Linked vector layer parameter name for dynamic properties. | |
Qgis::ProcessingParameterFlags | mFlags |
Parameter flags. | |
QVariant | mGuiDefault |
Default value for parameter in GUI. | |
QString | mHelp |
Parameter help. | |
bool | mIsDynamic = false |
True for dynamic parameters, which can have data-defined (QgsProperty) based values. | |
QVariantMap | mMetadata |
Freeform metadata for parameter. Mostly used by widget wrappers to customize their appearance and behavior. | |
QString | mName |
Parameter name. | |
QgsPropertyDefinition | mPropertyDefinition |
Data defined property definition. | |
An expression parameter for processing algorithms.
Definition at line 2959 of file qgsprocessingparameters.h.
QgsProcessingParameterExpression::QgsProcessingParameterExpression | ( | const QString & | name, |
const QString & | description = QString() , |
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const QVariant & | defaultValue = QVariant() , |
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const QString & | parentLayerParameterName = QString() , |
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bool | optional = false , |
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Qgis::ExpressionType | type = Qgis::ExpressionType::Qgis |
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) |
Constructor for QgsProcessingParameterExpression.
Definition at line 5495 of file qgsprocessingparameters.cpp.
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overridevirtual |
Returns the parameter definition as a Python command which can be used within a Python Processing script.
The outputType argument specifies the desired output format for the Python string, i.e. the intended end use of the generated Python code.
Reimplemented from QgsProcessingParameterDefinition.
Definition at line 5528 of file qgsprocessingparameters.cpp.
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overridevirtual |
Creates a clone of the parameter definition.
Implements QgsProcessingParameterDefinition.
Definition at line 5503 of file qgsprocessingparameters.cpp.
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overridevirtual |
Returns a list of other parameter names on which this parameter is dependent (e.g.
field parameters which depend on a parent layer parameter).
Reimplemented from QgsProcessingParameterDefinition.
Definition at line 5520 of file qgsprocessingparameters.cpp.
Qgis::ExpressionType QgsProcessingParameterExpression::expressionType | ( | ) | const |
Returns the parameter's expression type.
Definition at line 5573 of file qgsprocessingparameters.cpp.
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static |
Creates a new parameter using the definition from a script code.
Definition at line 5599 of file qgsprocessingparameters.cpp.
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overridevirtual |
Restores this parameter to a QVariantMap.
Subclasses should ensure that they call the base class method.
Reimplemented from QgsProcessingParameterDefinition.
Definition at line 5591 of file qgsprocessingparameters.cpp.
QString QgsProcessingParameterExpression::parentLayerParameterName | ( | ) | const |
Returns the name of the parent layer parameter, or an empty string if this is not set.
Definition at line 5563 of file qgsprocessingparameters.cpp.
void QgsProcessingParameterExpression::setExpressionType | ( | Qgis::ExpressionType | type | ) |
Sets the parameter's expression type.
Definition at line 5578 of file qgsprocessingparameters.cpp.
void QgsProcessingParameterExpression::setParentLayerParameterName | ( | const QString & | parentLayerParameterName | ) |
Sets the name of the parent layer parameter.
Use an empty string if this is not required.
Definition at line 5568 of file qgsprocessingparameters.cpp.
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overridevirtual |
Saves this parameter to a QVariantMap.
Subclasses should ensure that they call the base class method and then extend the result with additional properties.
Reimplemented from QgsProcessingParameterDefinition.
Definition at line 5583 of file qgsprocessingparameters.cpp.
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inlineoverridevirtual |
Unique parameter type name.
Implements QgsProcessingParameterDefinition.
Definition at line 2975 of file qgsprocessingparameters.h.
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inlinestatic |
Returns the type name for the parameter class.
Definition at line 2973 of file qgsprocessingparameters.h.
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overridevirtual |
Returns a string version of the parameter input value, which is suitable for use as an input parameter value when running an algorithm directly from a Python command.
Reimplemented from QgsProcessingParameterDefinition.
Definition at line 5508 of file qgsprocessingparameters.cpp.