Implement readXML for singleband pseudo color

Author: mhugent

src/core/raster/qgsrastershader.cpp

@@ -129,21 +129,21 @@ void QgsRasterShader::setMinimumValue( double theValue )
 
 void QgsRasterShader::writeXML( QDomDocument& doc, QDomElement& parent ) const
 {
-  if( parent.isNull() || !mRasterShaderFunction )
+  if ( parent.isNull() || !mRasterShaderFunction )
   {
     return;
   }
 
   QDomElement rasterShaderElem = doc.createElement( "rastershader" );
   QgsColorRampShader* colorRampShader = dynamic_cast<QgsColorRampShader*>( mRasterShaderFunction );
-  if( colorRampShader )
+  if ( colorRampShader )
   {
     QDomElement colorRampShaderElem = doc.createElement( "colorrampshader" );
     colorRampShaderElem.setAttribute( "colorRampType", colorRampShader->colorRampTypeAsQString() );
     //items
     QList<QgsColorRampShader::ColorRampItem> itemList = colorRampShader->colorRampItemList();
     QList<QgsColorRampShader::ColorRampItem>::const_iterator itemIt = itemList.constBegin();
-    for(; itemIt != itemList.constEnd(); ++itemIt )
+    for ( ; itemIt != itemList.constEnd(); ++itemIt )
     {
       QDomElement itemElem = doc.createElement( "item" );
       itemElem.setAttribute( "label", itemIt->label );
@@ -155,3 +155,32 @@ void QgsRasterShader::writeXML( QDomDocument& doc, QDomElement& parent ) const
   }
   parent.appendChild( rasterShaderElem );
 }
+
+void QgsRasterShader::readXML( const QDomElement& elem )
+{
+  //only colorrampshader
+  QDomElement colorRampShaderElem = elem.firstChildElement( "colorrampshader" );
+  if ( !colorRampShaderElem.isNull() )
+  {
+    QgsColorRampShader* colorRampShader = new QgsColorRampShader();
+    colorRampShader->setColorRampType( colorRampShaderElem.attribute( "colorRampType", "INTERPOLATED" ) );
+
+    QList<QgsColorRampShader::ColorRampItem> itemList;
+    QDomElement itemElem;
+    QString itemLabel;
+    double itemValue;
+    QColor itemColor;
+
+    QDomNodeList itemNodeList = colorRampShaderElem.elementsByTagName( "item" );
+    for ( int i = 0; i < itemNodeList.size(); ++i )
+    {
+      itemElem = itemNodeList.at( i ).toElement();
+      itemValue = itemElem.attribute( "value" ).toDouble();
+      itemLabel = itemElem.attribute( "label" );
+      itemColor.setNamedColor( itemElem.attribute( "color" ) );
+      itemList.push_back( QgsColorRampShader::ColorRampItem( itemValue, itemColor, itemLabel ) );
+    }
+    colorRampShader->setColorRampItemList( itemList );
+    setRasterShaderFunction( colorRampShader );
+  }
+}

src/core/raster/qgsrastershader.h

@@ -71,6 +71,8 @@ class CORE_EXPORT QgsRasterShader
 
     void writeXML( QDomDocument& doc, QDomElement& parent ) const;
 
+    void readXML( const QDomElement& elem );
+
   private:
     /** \brief User defineable minimum value for the raster shader */
     double mMinimumValue;

src/core/raster/qgssinglebandpseudocolorrenderer.cpp

@@ -41,7 +41,22 @@ void QgsSingleBandPseudoColorRenderer::setShader( QgsRasterShader* shader )
 
 QgsRasterRenderer* QgsSingleBandPseudoColorRenderer::create( const QDomElement& elem, QgsRasterDataProvider* provider )
 {
-  return 0;
+  if ( elem.isNull() )
+  {
+    return 0;
+  }
+
+  int band = elem.attribute( "band", "-1" ).toInt();
+  QgsRasterShader* shader = 0;
+  QDomElement rasterShaderElem = elem.firstChildElement( "rastershader" );
+  if ( !rasterShaderElem.isNull() )
+  {
+    shader = new QgsRasterShader();
+    shader->readXML( rasterShaderElem );
+  }
+  QgsRasterRenderer* r = new QgsSingleBandPseudoColorRenderer( provider, band, shader );
+  r->readXML( elem );
+  return r;
 }
 
 void QgsSingleBandPseudoColorRenderer::draw( QPainter* p, QgsRasterViewPort* viewPort, const QgsMapToPixel* theQgsMapToPixel )