QgsProjectProperty Class Reference

An Abstract Base Class for QGIS project property hierarchys. More...

#include <qgsprojectproperty.h>

Inheritance diagram for QgsProjectProperty:

Public Member Functions
	QgsProjectProperty ()
virtual	~QgsProjectProperty ()=default
virtual void	dump (int tabs=0) const =0
	Dumps out the keys and values. More...
virtual bool	isKey () const =0
	Returns true if the property is a QgsProjectPropertyKey. More...
virtual bool	isLeaf () const =0
	Returns true if property is a leaf node. More...
virtual bool	isValue () const =0
	Returns true if the property is a QgsProjectPropertyValue. More...
virtual bool	readXml (const QDomNode &keyNode)=0
	Restores the property hierarchy from a specified DOM node. More...
virtual QVariant	value () const =0
	Returns the node's value. More...
virtual bool	writeXml (const QString &nodeName, QDomElement &element, QDomDocument &document)=0
	Writes the property hierarchy to a specified DOM element. More...

Detailed Description

An Abstract Base Class for QGIS project property hierarchys.

Each sub-class is either a QgsProjectPropertyKey or QgsProjectPropertyValue. QgsProjectPropertyKey can contain either QgsProjectPropertyKey or QgsProjectPropertyValues, thus describing an hierarchy. QgsProjectPropertyValues are always graph leaves.

Note

This class is used internally by QgsProject. It's generally recommended that the methods in QgsProject are used to modify project properties rather than using these low-level classes.

Since

QGIS 3.0

Definition at line 49 of file qgsprojectproperty.h.

Constructor & Destructor Documentation

QgsProjectProperty::QgsProjectProperty

(

)

Definition at line 24 of file qgsprojectproperty.cpp.

virtual QgsProjectProperty::~QgsProjectProperty ( )

virtualdefault

Member Function Documentation

virtual void QgsProjectProperty::dump ( int  tabs = 0 ) const

pure virtual

Dumps out the keys and values.

Parameters

tabs	is number of tabs to print; used for pretty-printing hierarchy

Implemented in QgsProjectPropertyKey, and QgsProjectPropertyValue.

virtual bool QgsProjectProperty::isKey ( ) const

pure virtual

Returns true if the property is a QgsProjectPropertyKey.

See also

isValue()

isLeaf()

Implemented in QgsProjectPropertyKey, and QgsProjectPropertyValue.

virtual bool QgsProjectProperty::isLeaf ( ) const

pure virtual

Returns true if property is a leaf node.

A leaf node is a key node that has either no value or only a single value. A non-leaf node would be a key node with key sub-nodes.

This is used for entryList() and subkeyList() implementation.

Implemented in QgsProjectPropertyKey, and QgsProjectPropertyValue.

virtual bool QgsProjectProperty::isValue ( ) const

pure virtual

Returns true if the property is a QgsProjectPropertyValue.

See also

isKey()

isLeaf()

Implemented in QgsProjectPropertyKey, and QgsProjectPropertyValue.

virtual bool QgsProjectProperty::readXml ( const QDomNode &  keyNode )

pure virtual

Restores the property hierarchy from a specified DOM node.

Used for restoring properties from project file

Implemented in QgsProjectPropertyKey, and QgsProjectPropertyValue.

virtual QVariant QgsProjectProperty::value ( ) const

pure virtual

Returns the node's value.

For QgsProjectPropertyValue nodes, this is straightforward – just return the embedded QVariant, _value. For QgsProjectPropertyKey, this means returning the QgsProjectPropertyValue _value that is keyed by its name, if it exists; i.e., QgsProjectPropertyKey "foo" will return the property value mapped to its name, "foo", in its QHash of QProperties.

Implemented in QgsProjectPropertyKey, and QgsProjectPropertyValue.

virtual bool QgsProjectProperty::writeXml ( const QString &  nodeName, QDomElement &  element, QDomDocument &  document  )

pure virtual

Writes the property hierarchy to a specified DOM element.

Used for saving properties to project file.

Parameters

nodeName	the tag name associated with this element
element	the parent (or encompassing) property element
document	the overall project file Dom document

Implemented in QgsProjectPropertyKey, and QgsProjectPropertyValue.

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

• /build/qgis-3.4.15+24xenial/src/core/qgsprojectproperty.h
• /build/qgis-3.4.15+24xenial/src/core/qgsprojectproperty.cpp