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/**
* Assorted functions for dealing with layer trees.
*
* @note added in 2.4
*/
class QgsLayerTreeUtils
{
%TypeHeaderCode
#include <qgslayertreeutils.h>
%End
public:
//! Try to load layer tree from \verbatim <legend> \endverbatim 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 \verbatim <legend> \endverbatim tag from project files from QGIS 2.2 and below
static bool readOldLegendLayerOrder( const QDomElement& legendElem, bool& hasCustomOrder, QStringList& order );
//! Return \verbatim <legend> \endverbatim 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( const 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 and replaces it with a custom property embedded-visible-layers
static void replaceChildrenOfEmbeddedGroups( QgsLayerTreeGroup* group );
//! get invisible layers
static QStringList invisibleLayerList( QgsLayerTreeNode *node );
//! Set the expression filter of a legend layer
static void setLegendFilterByExpression( QgsLayerTreeLayer& layer, const QString& expr, bool enabled = true );
//! Return the expression filter of a legend layer
static QString legendFilterByExpression( const QgsLayerTreeLayer& layer, bool* enabled = 0 );
//! Test if one of the layers in a group has an expression filter
static bool hasLegendFilterExpression( const QgsLayerTreeGroup& group );
//! Insert a QgsMapLayer just below another one
//! @param group the tree group where layers are (can be the root group)
//! @param refLayer the reference layer
//! @param layerToInsert the new layer to insert just below the reference layer
//! @returns the new tree layer
static QgsLayerTreeLayer* insertLayerBelow( QgsLayerTreeGroup* group, const QgsMapLayer* refLayer, QgsMapLayer* layerToInsert );
};
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