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91 lines
3.0 KiB
Plaintext
91 lines
3.0 KiB
Plaintext
/************************************************************************
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* This file has been generated automatically from *
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* *
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* src/core/qgsdefaultvalue.h *
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* *
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* Do not edit manually ! Edit header and run scripts/sipify.pl again *
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************************************************************************/
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class QgsDefaultValue
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{
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%Docstring
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The QgsDefaultValue class provides a container for managing client
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side default values for fields.
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A QgsDefaultValue consists of an expression string that will be evaluated
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on the client when a default field value needs to be generated.
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Usual values for such an expression are
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- `:py:func:`~now`` for a timestamp for a record
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- `@some_variable` to insert a project or application level variable like
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the username of the one digitizing a feature
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- `$length` to insert a derived attribute of a geometry
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QgsDefaultValue also has a `applyOnUpdate` flag which will indicate that a
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default value should also be applied when a feature is updated. If this is
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not set, the default value will only be used when a feature is created.
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.. versionadded:: 3.0
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%End
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%TypeHeaderCode
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#include "qgsdefaultvalue.h"
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%End
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public:
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explicit QgsDefaultValue( const QString &expression = QString(), bool applyOnUpdate = false );
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%Docstring
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Create a new default value with the given ``expression`` and ``applyOnUpdate`` flag.
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.. seealso:: :py:func:`QgsVectorLayer.setDefaultValueDefinition`
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%End
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bool operator==( const QgsDefaultValue &other ) const;
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QString expression() const;
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%Docstring
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The expression will be evaluated whenever a default value needs
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to be calculated for a field.
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%End
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void setExpression( const QString &expression );
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%Docstring
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The expression will be evaluated whenever a default value needs
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to be calculated for a field.
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%End
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bool applyOnUpdate() const;
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%Docstring
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The applyOnUpdate flag determines if this expression should also be
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applied when a feature is updated or only when it's created.
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%End
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void setApplyOnUpdate( bool applyOnUpdate );
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%Docstring
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The applyOnUpdate flag determines if this expression should also be
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applied when a feature is updated or only when it's created.
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%End
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bool isValid() const;
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%Docstring
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Returns if this default value should be applied.
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:return: ``False`` if the expression is a null string.
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%End
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};
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/************************************************************************
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* This file has been generated automatically from *
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* *
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* src/core/qgsdefaultvalue.h *
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* *
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* Do not edit manually ! Edit header and run scripts/sipify.pl again *
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************************************************************************/
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