QGIS API Documentation  3.8.0-Zanzibar (11aff65)
qgslayertreelayer.h
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1 /***************************************************************************
2  qgslayertreelayer.h
3  --------------------------------------
4  Date : May 2014
5  Copyright : (C) 2014 by Martin Dobias
6  Email : wonder dot sk at gmail dot com
7  ***************************************************************************
8  * *
9  * This program is free software; you can redistribute it and/or modify *
10  * it under the terms of the GNU General Public License as published by *
11  * the Free Software Foundation; either version 2 of the License, or *
12  * (at your option) any later version. *
13  * *
14  ***************************************************************************/
15 
16 #ifndef QGSLAYERTREELAYER_H
17 #define QGSLAYERTREELAYER_H
18 
19 #include "qgis_core.h"
20 #include "qgis_sip.h"
21 #include "qgslayertreenode.h"
22 #include "qgsmaplayerref.h"
23 #include "qgsreadwritecontext.h"
24 
25 class QgsMapLayer;
26 
42 class CORE_EXPORT QgsLayerTreeLayer : public QgsLayerTreeNode
43 {
44  Q_OBJECT
45  public:
46  explicit QgsLayerTreeLayer( QgsMapLayer *layer );
47 
48 #ifndef SIP_RUN
49  QgsLayerTreeLayer( const QgsLayerTreeLayer &other );
50 #endif
51 
55  explicit QgsLayerTreeLayer( const QString &layerId, const QString &name = QString(), const QString &source = QString(), const QString &provider = QString() );
56 
62  QString layerId() const { return mRef.layerId; }
63 
73  QgsMapLayer *layer() const { return mRef.get(); }
74 
82  QString name() const override;
83 
91  void setName( const QString &n ) override;
92 
98  void setUseLayerName( bool use = true );
99 
104  bool useLayerName() const;
105 
110  static QgsLayerTreeLayer *readXml( QDomElement &element, const QgsReadWriteContext &context ) SIP_FACTORY;
111 
117  static QgsLayerTreeLayer *readXml( QDomElement &element, const QgsProject *project, const QgsReadWriteContext &context ) SIP_FACTORY;
118 
119  void writeXml( QDomElement &parentElement, const QgsReadWriteContext &context ) override;
120 
121  QString dump() const override;
122 
123  QgsLayerTreeLayer *clone() const override SIP_FACTORY;
124 
129  void resolveReferences( const QgsProject *project, bool looseMatching = false ) override;
130 
131  signals:
132 
136  void layerLoaded();
137 
142  void layerWillBeUnloaded();
143 
144  protected:
145  void attachToLayer();
146 
150  QString mLayerName;
151 
153  bool mUseLayerName = true;
154 
155  private slots:
156 
161  void layerNameChanged();
162 
167  void layerWillBeDeleted();
168 
169  private:
170 
171 #ifdef SIP_RUN
172 
176  QgsLayerTreeLayer( const QgsLayerTreeLayer &other );
177 #endif
178 };
179 
180 
181 
182 #endif // QGSLAYERTREELAYER_H
The class is used as a container of context for various read/write operations on other objects...
Base class for all map layer types.
Definition: qgsmaplayer.h:78
virtual QString name() const =0
Returns name of the node.
virtual void setName(const QString &name)=0
Set name of the node.
virtual void writeXml(QDomElement &parentElement, const QgsReadWriteContext &context)=0
Write layer tree to XML.
virtual QgsLayerTreeNode * clone() const =0
Create a copy of the node. Returns new instance.
virtual QString dump() const =0
Returns string with layer tree structure. For debug purposes only.
static QgsLayerTreeNode * readXml(QDomElement &element, const QgsReadWriteContext &context)
Read layer tree from XML.
QString layerId() const
Returns the ID for the map layer associated with this node.
QgsMapLayerRef mRef
Weak reference to the layer (or just it's ID if the reference is not resolved yet) ...
QString mLayerName
Layer name - only used if layer does not exist or if mUseLayerName is false.
This class is a base class for nodes in a layer tree.
Reads and writes project states.
Definition: qgsproject.h:89
#define SIP_FACTORY
Definition: qgis_sip.h:69
QgsMapLayer * layer() const
Returns the map layer associated with this node.
virtual void resolveReferences(const QgsProject *project, bool looseMatching=false)=0
Turn textual references to layers into map layer object from project.
Layer tree node points to a map layer.