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qgslayertreelayer.h
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qgslayertreelayer.h
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/***************************************************************************
qgslayertreelayer.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 QGSLAYERTREELAYER_H
#define QGSLAYERTREELAYER_H
#include "qgslayertreenode.h"
class QgsMapLayer;
/** \ingroup core
* Layer tree node points to a map layer.
*
* When using with existing QgsMapLayer instance, it is expected that the layer
* has been registered in QgsMapLayerRegistry earlier.
*
* The node can exist also without a valid instance of a layer (just ID). That
* means the referenced layer does not need to be loaded in order to use it
* in layer tree. In such case, the node will start listening to map layer
* registry updates in expectation that the layer (identified by its ID) will
* be loaded later.
*
* A map layer is supposed to be present in one layer tree just once. It is
* however possible that temporarily a layer exists in one tree more than just
* once, e.g. while reordering items with drag and drop.
*
* @note added in 2.4
*/
class CORE_EXPORT QgsLayerTreeLayer : public QgsLayerTreeNode
{
Q_OBJECT
public:
explicit QgsLayerTreeLayer( QgsMapLayer* layer );
QgsLayerTreeLayer( const QgsLayerTreeLayer& other );
/**
* Creates a layer node which will attach to a layer with a matching
* QgsMapLayer::publicSource(). This can be used for "looser" layer matching,
* avoiding the usual layer id check in favour of attaching to any layer
* with an equal source.
*/
static QgsLayerTreeLayer* createLayerFromSource( const QString& source );
explicit QgsLayerTreeLayer( const QString& layerId, const QString& name = QString() );
QString layerId() const { return mLayerId; }
QgsMapLayer* layer() const { return mLayer; }
//! Get layer's name
//! @note added in 2.18.1
QString name() const override;
//! Set layer's name
//! @note added in 2.18.1
void setName( const QString& n ) override;
/**
* Attempts to attach this layer node to a layer with a matching
* QgsMapLayer::publicSource(). This can be used for "looser" layer matching,
* avoiding the usual layer id check in favour of attaching to any layer
* with an equal source.
*/
void attachToSource( const QString& source );
QString layerName() const;
void setLayerName( const QString& n );
Qt::CheckState isVisible() const { return mVisible; }
void setVisible( Qt::CheckState visible );
/**
* Creates a new layer from an XML definition. If the looseMatch
* parameter is true then legend layers will use looser matching criteria,
* eg testing layer source instead of layer IDs.
*/
static QgsLayerTreeLayer* readXML( QDomElement& element, bool looseMatch = false );
virtual void writeXML( QDomElement& parentElement ) override;
virtual QString dump() const override;
virtual QgsLayerTreeLayer* clone() const override;
protected slots:
void registryLayersAdded( const QList<QgsMapLayer*>& layers );
void registryLayersWillBeRemoved( const QStringList& layerIds );
//! Emits a nameChanged() signal if layer's name has changed
//! @note added in 2.18.1
void layerNameChanged();
signals:
//! emitted when a previously unavailable layer got loaded
void layerLoaded();
//! emitted when a previously available layer got unloaded (from layer registry)
//! @note added in 2.6
void layerWillBeUnloaded();
protected:
void attachToLayer();
QString mLayerId;
QString mLayerName; // only used if layer does not exist
//! Only used when loosely matching to layers - eg when creating a composer legend from template
//! If set this will attach to the first matching layer with an equal source
QString mLayerSource;
QgsMapLayer* mLayer; // not owned! may be null
Qt::CheckState mVisible;
};
#endif // QGSLAYERTREELAYER_H