Add QgsColorRampLegendNodeSettings to QgsSingleBandGrayRenderer

python/core/auto_generated/raster/qgscolorrampshader.sip.in

@@ -212,6 +212,8 @@ Returns whether the shader will clip values which are out of range.
 Returns the color ramp shader legend settings.
 
 .. seealso:: :py:func:`setLegendSettings`
+
+.. versionadded:: 3.18
 %End
 
     void setLegendSettings( QgsColorRampLegendNodeSettings *settings /Transfer/ );
@@ -221,6 +223,8 @@ Sets the color ramp shader legend ``settings``.
 Ownership of ``settings`` is transferred.
 
 .. seealso:: :py:func:`legendSettings`
+
+.. versionadded:: 3.18
 %End
 
   protected:

python/core/auto_generated/raster/qgssinglebandgrayrenderer.sip.in

@@ -65,6 +65,26 @@ Takes ownership
     virtual void toSld( QDomDocument &doc, QDomElement &element, const QgsStringMap &props = QgsStringMap() ) const;
 
 
+    const QgsColorRampLegendNodeSettings *legendSettings() const;
+%Docstring
+Returns the color ramp shader legend settings.
+
+.. seealso:: :py:func:`setLegendSettings`
+
+.. versionadded:: 3.18
+%End
+
+    void setLegendSettings( QgsColorRampLegendNodeSettings *settings /Transfer/ );
+%Docstring
+Sets the color ramp shader legend ``settings``.
+
+Ownership of ``settings`` is transferred.
+
+.. seealso:: :py:func:`legendSettings`
+
+.. versionadded:: 3.18
+%End
+
   private:
     QgsSingleBandGrayRenderer( const QgsSingleBandGrayRenderer & );
     const QgsSingleBandGrayRenderer &operator=( const QgsSingleBandGrayRenderer & );

src/core/raster/qgscolorrampshader.cpp

@@ -37,6 +37,7 @@ QgsColorRampShader::QgsColorRampShader( double minimumValue, double maximumValue
   : QgsRasterShaderFunction( minimumValue, maximumValue )
   , mColorRampType( type )
   , mClassificationMode( classificationMode )
+  , mLegendSettings( qgis::make_unique< QgsColorRampLegendNodeSettings >() )
 {
   QgsDebugMsgLevel( QStringLiteral( "called." ), 4 );
 

src/core/raster/qgscolorrampshader.h

@@ -230,6 +230,7 @@ class CORE_EXPORT QgsColorRampShader : public QgsRasterShaderFunction
      * Returns the color ramp shader legend settings.
      *
      * \see setLegendSettings()
+     * \since QGIS 3.18
      */
     const QgsColorRampLegendNodeSettings *legendSettings() const;
 
@@ -239,6 +240,7 @@ class CORE_EXPORT QgsColorRampShader : public QgsRasterShaderFunction
      * Ownership of \a settings is transferred.
      *
      * \see legendSettings()
+     * \since QGIS 3.18
      */
     void setLegendSettings( QgsColorRampLegendNodeSettings *settings SIP_TRANSFER );
 

src/core/raster/qgssinglebandgrayrenderer.cpp

@@ -19,6 +19,8 @@
 #include "qgscontrastenhancement.h"
 #include "qgsrastertransparency.h"
 #include "qgscolorramplegendnode.h"
+#include "qgscolorramplegendnodesettings.h"
+#include "qgsreadwritecontext.h"
 #include <QDomDocument>
 #include <QDomElement>
 #include <QImage>
@@ -30,6 +32,7 @@ QgsSingleBandGrayRenderer::QgsSingleBandGrayRenderer( QgsRasterInterface *input,
   , mGrayBand( grayBand )
   , mGradient( BlackToWhite )
   , mContrastEnhancement( nullptr )
+  , mLegendSettings( qgis::make_unique< QgsColorRampLegendNodeSettings >() )
 {
 }
 
@@ -43,6 +46,7 @@ QgsSingleBandGrayRenderer *QgsSingleBandGrayRenderer::clone() const
   {
     renderer->setContrastEnhancement( new QgsContrastEnhancement( *mContrastEnhancement ) );
   }
+  renderer->setLegendSettings( mLegendSettings ? new QgsColorRampLegendNodeSettings( *mLegendSettings.get() ) : new QgsColorRampLegendNodeSettings() );
   return renderer;
 }
 
@@ -70,6 +74,11 @@ QgsRasterRenderer *QgsSingleBandGrayRenderer::create( const QDomElement &elem, Q
     ce->readXml( contrastEnhancementElem );
     r->setContrastEnhancement( ce );
   }
+
+  std::unique_ptr< QgsColorRampLegendNodeSettings > legendSettings = qgis::make_unique< QgsColorRampLegendNodeSettings >();
+  legendSettings->readXml( elem, QgsReadWriteContext() );
+  r->setLegendSettings( legendSettings.release() );
+
   return r;
 }
 
@@ -196,6 +205,10 @@ void QgsSingleBandGrayRenderer::writeXml( QDomDocument &doc, QDomElement &parent
     mContrastEnhancement->writeXml( doc, contrastElem );
     rasterRendererElem.appendChild( contrastElem );
   }
+
+  if ( mLegendSettings )
+    mLegendSettings->writeXml( doc, rasterRendererElem, QgsReadWriteContext() );
+
   parentElem.appendChild( rasterRendererElem );
 }
 
@@ -226,8 +239,9 @@ QList<QgsLayerTreeModelLegendNode *> QgsSingleBandGrayRenderer::createLegendNode
     const QColor minColor = ( mGradient == BlackToWhite ) ? Qt::black : Qt::white;
     const QColor maxColor = ( mGradient == BlackToWhite ) ? Qt::white : Qt::black;
     res << new QgsColorRampLegendNode( nodeLayer, new QgsGradientColorRamp( minColor, maxColor ),
-                                       QString::number( mContrastEnhancement->minimumValue() ),
-                                       QString::number( mContrastEnhancement->maximumValue() ) );
+                                       mLegendSettings ? *mLegendSettings : QgsColorRampLegendNodeSettings(),
+                                       mContrastEnhancement->minimumValue(),
+                                       mContrastEnhancement->maximumValue() );
   }
   return res;
 }
@@ -391,3 +405,15 @@ void QgsSingleBandGrayRenderer::toSld( QDomDocument &doc, QDomElement &element,
     }
   }
 }
+
+const QgsColorRampLegendNodeSettings *QgsSingleBandGrayRenderer::legendSettings() const
+{
+  return mLegendSettings.get();
+}
+
+void QgsSingleBandGrayRenderer::setLegendSettings( QgsColorRampLegendNodeSettings *settings )
+{
+  if ( settings == mLegendSettings.get() )
+    return;
+  mLegendSettings.reset( settings );
+}

src/core/raster/qgssinglebandgrayrenderer.h

@@ -25,6 +25,7 @@
 
 class QgsContrastEnhancement;
 class QDomElement;
+class QgsColorRampLegendNodeSettings;
 
 /**
  * \ingroup core
@@ -70,6 +71,24 @@ class CORE_EXPORT QgsSingleBandGrayRenderer: public QgsRasterRenderer
 
     void toSld( QDomDocument &doc, QDomElement &element, const QgsStringMap &props = QgsStringMap() ) const override;
 
+    /**
+     * Returns the color ramp shader legend settings.
+     *
+     * \see setLegendSettings()
+     * \since QGIS 3.18
+     */
+    const QgsColorRampLegendNodeSettings *legendSettings() const;
+
+    /**
+     * Sets the color ramp shader legend \a settings.
+     *
+     * Ownership of \a settings is transferred.
+     *
+     * \see legendSettings()
+     * \since QGIS 3.18
+     */
+    void setLegendSettings( QgsColorRampLegendNodeSettings *settings SIP_TRANSFER );
+
   private:
 #ifdef SIP_RUN
     QgsSingleBandGrayRenderer( const QgsSingleBandGrayRenderer & );
@@ -79,7 +98,7 @@ class CORE_EXPORT QgsSingleBandGrayRenderer: public QgsRasterRenderer
     int mGrayBand;
     Gradient mGradient;
     std::unique_ptr< QgsContrastEnhancement > mContrastEnhancement;
-
+    std::unique_ptr< QgsColorRampLegendNodeSettings > mLegendSettings;
 };
 
 #endif // QGSSINGLEBANDGRAYRENDERER_H