An expression with an additional enabled flag. More...

#include <qgsoptionalexpression.h>

Inheritance diagram for QgsOptionalExpression:

Public Member Functions
	QgsOptionalExpression ()=default
	Construct a default optional expression. More...

	QgsOptionalExpression (const QgsExpression &expression)
	Construct an optional expression with the provided expression. More...

	QgsOptionalExpression (const QgsExpression &expression, bool enabled)
	Construct an optional expression with the provided expression and enabled state. More...

void	readXml (const QDomElement &element)
	Read the optional expression from the provided QDomElement. More...

void	writeXml (QDomElement &element)
	Save the optional expression to the provided QDomElement. More...

Public Member Functions inherited from QgsOptional< QgsExpression >
	QgsOptional ()=default
	A QgsOptional is disabled by default if default constructed. More...

	QgsOptional (const QgsExpression &data)
	A QgsOptional is enabled by default if constructed with payload. More...

	QgsOptional (const QgsExpression &data, bool enabled)
	A QgsOptional constructed with enabled status and data. More...

QgsExpression	data () const
	Access the payload data. More...

bool	enabled () const
	Check if this optional is enabled. More...

	operator bool () const
	Boolean operator. More...

const QgsExpression *	operator-> () const
	Access the payload data. More...

bool	operator== (const QgsOptional< QgsExpression > &other) const
	Compare this QgsOptional to another one. More...

void	setData (const QgsExpression &data)
	Set the payload data. More...

void	setEnabled (bool enabled)
	Set if this optional is enabled. More...

Detailed Description

An expression with an additional enabled flag.

This can be used for configuration options where an expression can be enabled or disabled but when disabled it shouldn't lose it's information for the case it gets re-enabled later on and a user shouldn't be force to redo the configuration.

Since: QGIS 2.18

Definition at line 39 of file qgsoptionalexpression.h.

Constructor & Destructor Documentation

◆ QgsOptionalExpression() [1/3]

QgsOptionalExpression::QgsOptionalExpression ( )

default

Construct a default optional expression.

It will be disabled and with an empty expression.

◆ QgsOptionalExpression() [2/3]

QgsOptionalExpression::QgsOptionalExpression ( const QgsExpression & expression )

Construct an optional expression with the provided expression.

It will be enabled.

Definition at line 19 of file qgsoptionalexpression.cpp.

◆ QgsOptionalExpression() [3/3]

QgsOptionalExpression::QgsOptionalExpression	(	const QgsExpression &	expression,
		bool	enabled
	)

Construct an optional expression with the provided expression and enabled state.

Definition at line 25 of file qgsoptionalexpression.cpp.

Member Function Documentation

◆ readXml()

void QgsOptionalExpression::readXml ( const QDomElement & element )

Read the optional expression from the provided QDomElement.

Since: QGIS 2.18

Definition at line 38 of file qgsoptionalexpression.cpp.

◆ writeXml()

void QgsOptionalExpression::writeXml ( QDomElement & element )

Save the optional expression to the provided QDomElement.

The caller is responsible to pass an empty QDomElement and to append it to a parent element.

Since: QGIS 2.18

Definition at line 31 of file qgsoptionalexpression.cpp.

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

/tmp/buildd/qgis-3.8.0+99unstable/src/core/qgsoptionalexpression.h
/tmp/buildd/qgis-3.8.0+99unstable/src/core/qgsoptionalexpression.cpp

Public Member Functions