QGIS API Documentation 3.34.0-Prizren (ffbdd678812)
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qgsmaplayerstyle.cpp
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1/***************************************************************************
2 qgsmaplayersty.cpp
3 --------------------------------------
4 Date : September 2019
5 Copyright : (C) 2018 by Denis Rouzaud
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#include "qgsmaplayerstyle.h"
18#include "qgsreadwritecontext.h"
19#include "qgsmaplayer.h"
20
21
22#include "qgslogger.h"
23
24#include <QDomElement>
25#include <QTextStream>
26
27
28QgsMapLayerStyle::QgsMapLayerStyle( const QString &xmlData )
29 : mXmlData( xmlData )
30{
31}
32
34{
35 return !mXmlData.isEmpty();
36}
37
39{
40 mXmlData.clear();
41}
42
44{
45 return mXmlData;
46}
47
49{
50 QString errorMsg;
51 QDomDocument doc;
52 const QgsReadWriteContext context;
53 layer->exportNamedStyle( doc, errorMsg, context );
54 if ( !errorMsg.isEmpty() )
55 {
56 QgsDebugError( "Failed to export style from layer: " + errorMsg );
57 return;
58 }
59
60 mXmlData.clear();
61 QTextStream stream( &mXmlData );
62 doc.documentElement().save( stream, 0 );
63}
64
66{
67 if ( !isValid() )
68 {
69 return;
70 }
71
72 QDomDocument doc( QStringLiteral( "qgis" ) );
73 if ( !doc.setContent( mXmlData ) )
74 {
75 QgsDebugError( QStringLiteral( "Failed to parse XML of previously stored XML data - this should not happen!" ) );
76 return;
77 }
78
79 QString errorMsg;
80 if ( !layer->importNamedStyle( doc, errorMsg ) )
81 {
82 QgsDebugError( "Failed to import style to layer: " + errorMsg );
83 }
84}
85
86void QgsMapLayerStyle::readXml( const QDomElement &styleElement )
87{
88 mXmlData.clear();
89 QTextStream stream( &mXmlData );
90 styleElement.firstChildElement().save( stream, 0 );
91}
92
93void QgsMapLayerStyle::writeXml( QDomElement &styleElement ) const
94{
95 // the currently selected style has no content stored here (layer has all the information inside)
96 if ( !isValid() )
97 return;
98
99 QDomDocument docX;
100 docX.setContent( mXmlData );
101 styleElement.appendChild( docX.documentElement() );
102}
103
105{
106 if ( mLayer && mStyleOverridden )
108}
109
111{
112 if ( mLayer )
113 {
114 if ( mStyleOverridden )
116
117 mLayer->styleManager()->setOverrideStyle( style );
118 mStyleOverridden = true;
119 }
120}
bool restoreOverrideStyle()
Restore the original store after a call to setOverrideStyle()
bool setOverrideStyle(const QString &styleDef)
Temporarily apply a different style to the layer.
void setOverrideStyle(const QString &style)
Temporarily apply a different style to the layer.
void readXml(const QDomElement &styleElement)
Read style configuration (for project file reading)
void readFromLayer(QgsMapLayer *layer)
Store layer's active style information in the instance.
void clear()
Remove any stored style data (will get invalid)
void writeToLayer(QgsMapLayer *layer) const
Apply stored layer's style information to the layer.
bool isValid() const
Tell whether the style is valid (i.e. there is something stored in it)
void writeXml(QDomElement &styleElement) const
Write style configuration (for project file writing)
QString xmlData() const
Returns XML content of the style.
QgsMapLayerStyle()=default
construct invalid style
Base class for all map layer types.
Definition qgsmaplayer.h:74
virtual void exportNamedStyle(QDomDocument &doc, QString &errorMsg, const QgsReadWriteContext &context=QgsReadWriteContext(), QgsMapLayer::StyleCategories categories=QgsMapLayer::AllStyleCategories) const
Export the properties of this layer as named style in a QDomDocument.
virtual bool importNamedStyle(QDomDocument &doc, QString &errorMsg, QgsMapLayer::StyleCategories categories=QgsMapLayer::AllStyleCategories)
Import the properties of this layer from a QDomDocument.
QgsMapLayerStyleManager * styleManager() const
Gets access to the layer's style manager.
The class is used as a container of context for various read/write operations on other objects.
#define QgsDebugError(str)
Definition qgslogger.h:38