QGIS API Documentation  3.6.0-Noosa (5873452)
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 
97  static QgsLayerTreeLayer *readXml( QDomElement &element, const QgsReadWriteContext &context ) SIP_FACTORY;
98 
104  static QgsLayerTreeLayer *readXml( QDomElement &element, const QgsProject *project, const QgsReadWriteContext &context ) SIP_FACTORY;
105 
106  void writeXml( QDomElement &parentElement, const QgsReadWriteContext &context ) override;
107 
108  QString dump() const override;
109 
110  QgsLayerTreeLayer *clone() const override SIP_FACTORY;
111 
116  void resolveReferences( const QgsProject *project, bool looseMatching = false ) override;
117 
118  signals:
119 
123  void layerLoaded();
124 
129  void layerWillBeUnloaded();
130 
131  protected:
132  void attachToLayer();
133 
137  QString mLayerName;
138 
139  private slots:
140 
145  void layerNameChanged();
146 
151  void layerWillBeDeleted();
152 
153  private:
154 
155 #ifdef SIP_RUN
156 
160  QgsLayerTreeLayer( const QgsLayerTreeLayer &other );
161 #endif
162 };
163 
164 
165 
166 #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:64
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.
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.