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qgslayertreeutils.h
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qgslayertreeutils.h
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/***************************************************************************
qgslayertreeutils.h
--------------------------------------
Date : May 2014
Copyright : (C) 2014 by Martin Dobias
Email : wonder dot sk at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#ifndef QGSLAYERTREEUTILS_H
#define QGSLAYERTREEUTILS_H
#include <qnamespace.h>
#include <QList>
class QDomElement;
class QDomDocument;
class QStringList;
class QgsLayerTreeGroup;
class QgsLayerTreeLayer;
/**
* Assorted functions for dealing with layer trees.
*
* @note added in 2.4
*/
class CORE_EXPORT QgsLayerTreeUtils
{
public:
//! Try to load layer tree from <legend> tag from project files from QGIS 2.2 and below
static bool readOldLegend( QgsLayerTreeGroup* root, const QDomElement& legendElem );
//! Try to load custom layer order from <legend> tag from project files from QGIS 2.2 and below
static bool readOldLegendLayerOrder( const QDomElement& legendElem, bool& hasCustomOrder, QStringList& order );
//! Return <legend> tag used in QGIS 2.2 and below
static QDomElement writeOldLegend( QDomDocument& doc, QgsLayerTreeGroup* root, bool hasCustomOrder, const QStringList& order );
//! Convert Qt::CheckState to QString
static QString checkStateToXml( Qt::CheckState state );
//! Convert QString to Qt::CheckState
static Qt::CheckState checkStateFromXml( QString txt );
//! Return true if any of the layers is editable
static bool layersEditable( const QList<QgsLayerTreeLayer*>& layerNodes );
//! Return true if any of the layers is modified
static bool layersModified( const QList<QgsLayerTreeLayer*>& layerNodes );
//! Remove layer nodes that refer to invalid layers
static void removeInvalidLayers( QgsLayerTreeGroup* group );
//! Remove subtree of embedded groups. Useful when saving layer tree
static void removeChildrenOfEmbeddedGroups( QgsLayerTreeGroup* group );
//! @note not available in python bindings
static void updateEmbeddedGroupsProjectPath( QgsLayerTreeGroup* group );
};
#endif // QGSLAYERTREEUTILS_H