QGIS API Documentation 3.27.0-Master (95e00c50d2)
qgsoptionalexpression.cpp
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1/***************************************************************************
2 qgsoptionalexpression - QgsOptionalExpression
3
4 ---------------------
5 begin : 14.9.2016
6 copyright : (C) 2016 by Matthias Kuhn
8 ***************************************************************************
9 * *
10 * This program is free software; you can redistribute it and/or modify *
11 * it under the terms of the GNU General Public License as published by *
12 * the Free Software Foundation; either version 2 of the License, or *
13 * (at your option) any later version. *
14 * *
15 ***************************************************************************/
16
18
20 : QgsOptional<QgsExpression>( expression )
21{
22
23}
24
26 : QgsOptional<QgsExpression>( expression, enabled )
27{
28
29}
30
31void QgsOptionalExpression::writeXml( QDomElement &element ) const
32{
33 const QDomText exp = element.ownerDocument().createTextNode( data().expression() );
34 element.setAttribute( QStringLiteral( "enabled" ), enabled() );
35 element.appendChild( exp );
36}
37
38void QgsOptionalExpression::readXml( const QDomElement &element )
39{
40 setEnabled( element.attribute( QStringLiteral( "enabled" ) ).toInt() );
41 setData( element.text() );
42}
Class for parsing and evaluation of expressions (formerly called "search strings").
void writeXml(QDomElement &element) const
Save the optional expression to the provided QDomElement.
void readXml(const QDomElement &element)
Read the optional expression from the provided QDomElement.
QgsOptionalExpression()=default
Construct a default optional expression.
QgsOptional is a container for other classes and adds an additional enabled/disabled flag.
Definition: qgsoptional.h:37
bool enabled() const
Check if this optional is enabled.
Definition: qgsoptional.h:89
void setData(const QgsExpression &data)
Set the payload data.
Definition: qgsoptional.h:129
void setEnabled(bool enabled)
Set if this optional is enabled.
Definition: qgsoptional.h:99
QgsExpression data() const
Access the payload data.
Definition: qgsoptional.h:119