qgsmaplayerlegend.cpp

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/***************************************************************************
  qgsmaplayerlegend.cpp
  --------------------------------------
  Date                 : July 2014
  Copyright            : (C) 2014 by Martin Dobias
  Email                : wonder dot sk at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#include "qgsmaplayerlegend.h"
 
#include "qgscolorramplegendnode.h"
#include "qgsdiagramrenderer.h"
#include "qgsiconutils.h"
#include "qgsimagecache.h"
#include "qgslayertree.h"
#include "qgslayertreemodellegendnode.h"
#include "qgsmeshlayer.h"
#include "qgspluginlayer.h"
#include "qgspointcloudlayer.h"
#include "qgspointcloudrenderer.h"
#include "qgsrasterlayer.h"
#include "qgsrasterrenderer.h"
#include "qgsrenderer.h"
#include "qgsrulebasedlabeling.h"
#include "qgssettings.h"
#include "qgssymbollayerutils.h"
#include "qgsvectorlayer.h"
#include "qgsvectorlayerlabeling.h"
 
#include <QString>
 
#include "moc_qgsmaplayerlegend.cpp"
 
using namespace Qt::StringLiterals;
 
QgsMapLayerLegend::QgsMapLayerLegend( QObject *parent )
  : QObject( parent )
{
}
 
void QgsMapLayerLegend::readXml( const QDomElement &elem, const QgsReadWriteContext & )
{
  mFlags = Qgis::MapLayerLegendFlags();
  mFlags.setFlag( Qgis::MapLayerLegendFlag::ExcludeByDefault, elem.attribute( u"excludeByDefault"_s, u"0"_s ).toInt() == 1 );
}
 
QDomElement QgsMapLayerLegend::writeXml( QDomDocument &doc, const QgsReadWriteContext & ) const
{
  QDomElement elem = doc.createElement( u"legend"_s );
  if ( mFlags.testFlag( Qgis::MapLayerLegendFlag::ExcludeByDefault ) )
  {
    elem.setAttribute( u"excludeByDefault"_s,  u"1"_s );
  }
  return elem;
}
 
QgsMapLayerLegend *QgsMapLayerLegend::defaultVectorLegend( QgsVectorLayer *vl )
{
  return new QgsDefaultVectorLayerLegend( vl );
}
 
QgsMapLayerLegend *QgsMapLayerLegend::defaultRasterLegend( QgsRasterLayer *rl )
{
  return new QgsDefaultRasterLayerLegend( rl );
}
 
QgsMapLayerLegend *QgsMapLayerLegend::defaultMeshLegend( QgsMeshLayer *ml )
{
  return new QgsDefaultMeshLayerLegend( ml );
}
 
QgsMapLayerLegend *QgsMapLayerLegend::defaultPointCloudLegend( QgsPointCloudLayer *layer )
{
  return new QgsDefaultPointCloudLayerLegend( layer );
}
 
// -------------------------------------------------------------------------
 
 
void QgsMapLayerLegendUtils::setLegendNodeOrder( QgsLayerTreeLayer *nodeLayer, const QList<int> &order )
{
  QStringList orderStr;
  const auto constOrder = order;
  for ( const int id : constOrder )
    orderStr << QString::number( id );
  const QString str = orderStr.isEmpty() ? u"empty"_s : orderStr.join( ','_L1 );
 
  nodeLayer->setCustomProperty( u"legend/node-order"_s, str );
}
 
static int _originalLegendNodeCount( QgsLayerTreeLayer *nodeLayer )
{
  // this is not particularly efficient way of finding out number of legend nodes
  const QList<QgsLayerTreeModelLegendNode *> lst = nodeLayer->layer()->legend()->createLayerTreeModelLegendNodes( nodeLayer );
  const int numNodes = lst.count();
  qDeleteAll( lst );
  return numNodes;
}
 
static QList<int> _makeNodeOrder( QgsLayerTreeLayer *nodeLayer )
{
  if ( !nodeLayer->layer() || !nodeLayer->layer()->legend() )
  {
    QgsDebugError( u"Legend node order manipulation is invalid without existing legend"_s );
    return QList<int>();
  }
 
  const int numNodes = _originalLegendNodeCount( nodeLayer );
 
  QList<int> order;
  order.reserve( numNodes );
  for ( int i = 0; i < numNodes; ++i )
    order << i;
  return order;
}
 
QList<int> QgsMapLayerLegendUtils::legendNodeOrder( QgsLayerTreeLayer *nodeLayer )
{
  const QString orderStr = nodeLayer->customProperty( u"legend/node-order"_s ).toString();
 
  if ( orderStr.isEmpty() )
    return _makeNodeOrder( nodeLayer );
 
  if ( orderStr == "empty"_L1 )
    return QList<int>();
 
  const int numNodes = _originalLegendNodeCount( nodeLayer );
 
  QList<int> lst;
  const auto constSplit = orderStr.split( ',' );
  for ( const QString &item : constSplit )
  {
    bool ok;
    const int id = item.toInt( &ok );
    if ( !ok || id < 0 || id >= numNodes )
      return _makeNodeOrder( nodeLayer );
 
    lst << id;
  }
 
  return lst;
}
 
bool QgsMapLayerLegendUtils::hasLegendNodeOrder( QgsLayerTreeLayer *nodeLayer )
{
  return nodeLayer->customProperties().contains( u"legend/node-order"_s );
}
 
void QgsMapLayerLegendUtils::setLegendNodeUserLabel( QgsLayerTreeLayer *nodeLayer, int originalIndex, const QString &newLabel )
{
  nodeLayer->setCustomProperty( "legend/label-" + QString::number( originalIndex ), newLabel );
}
 
QString QgsMapLayerLegendUtils::legendNodeUserLabel( QgsLayerTreeLayer *nodeLayer, int originalIndex )
{
  return nodeLayer->customProperty( "legend/label-" + QString::number( originalIndex ) ).toString();
}
 
bool QgsMapLayerLegendUtils::hasLegendNodeUserLabel( QgsLayerTreeLayer *nodeLayer, int originalIndex )
{
  return nodeLayer->customProperties().contains( "legend/label-" + QString::number( originalIndex ) );
}
 
void QgsMapLayerLegendUtils::setLegendNodePatchShape( QgsLayerTreeLayer *nodeLayer, int originalIndex, const QgsLegendPatchShape &shape )
{
  QDomDocument patchDoc;
  QDomElement patchElem = patchDoc.createElement( u"patch"_s );
  shape.writeXml( patchElem, patchDoc, QgsReadWriteContext() );
  patchDoc.appendChild( patchElem );
  nodeLayer->setCustomProperty( "legend/patch-shape-" + QString::number( originalIndex ), patchDoc.toString() );
}
 
QgsLegendPatchShape QgsMapLayerLegendUtils::legendNodePatchShape( QgsLayerTreeLayer *nodeLayer, int originalIndex )
{
  const QString patchDef = nodeLayer->customProperty( "legend/patch-shape-" + QString::number( originalIndex ) ).toString();
  if ( patchDef.isEmpty() )
    return QgsLegendPatchShape();
 
  QDomDocument doc( u"patch"_s );
  doc.setContent( patchDef );
  QgsLegendPatchShape shape;
  shape.readXml( doc.documentElement(), QgsReadWriteContext() );
  return shape;
}
 
void QgsMapLayerLegendUtils::setLegendNodeSymbolSize( QgsLayerTreeLayer *nodeLayer, int originalIndex, QSizeF size )
{
  if ( size.isValid() )
    nodeLayer->setCustomProperty( "legend/symbol-size-" + QString::number( originalIndex ), QgsSymbolLayerUtils::encodeSize( size ) );
  else
    nodeLayer->removeCustomProperty( "legend/symbol-size-" + QString::number( originalIndex ) );
}
 
QSizeF QgsMapLayerLegendUtils::legendNodeSymbolSize( QgsLayerTreeLayer *nodeLayer, int originalIndex )
{
  const QString size = nodeLayer->customProperty( "legend/symbol-size-" + QString::number( originalIndex ) ).toString();
  if ( size.isEmpty() )
    return QSizeF();
  else
    return QgsSymbolLayerUtils::decodeSize( size );
}
 
void QgsMapLayerLegendUtils::setLegendNodeCustomSymbol( QgsLayerTreeLayer *nodeLayer, int originalIndex, const QgsSymbol *symbol )
{
  if ( symbol )
  {
    QDomDocument doc;
    QgsReadWriteContext rwContext;
    rwContext.setPathResolver( QgsProject::instance()->pathResolver() ); // skip-keyword-check
    const QDomElement elem = QgsSymbolLayerUtils::saveSymbol( u"custom symbol"_s, symbol, doc, rwContext );
    doc.appendChild( elem );
    nodeLayer->setCustomProperty( "legend/custom-symbol-" + QString::number( originalIndex ), doc.toString() );
  }
  else
    nodeLayer->removeCustomProperty( "legend/custom-symbol-" + QString::number( originalIndex ) );
}
 
std::unique_ptr< QgsSymbol > QgsMapLayerLegendUtils::legendNodeCustomSymbol( QgsLayerTreeLayer *nodeLayer, int originalIndex )
{
  const QString symbolDef = nodeLayer->customProperty( "legend/custom-symbol-" + QString::number( originalIndex ) ).toString();
  if ( symbolDef.isEmpty() )
    return nullptr;
 
  QDomDocument doc;
  doc.setContent( symbolDef );
  const QDomElement elem = doc.documentElement();
 
  QgsReadWriteContext rwContext;
  rwContext.setPathResolver( QgsProject::instance()->pathResolver() ); // skip-keyword-check
 
  return QgsSymbolLayerUtils::loadSymbol( elem, rwContext );
}
 
void QgsMapLayerLegendUtils::setLegendNodeColorRampSettings( QgsLayerTreeLayer *nodeLayer, int originalIndex, const QgsColorRampLegendNodeSettings *settings )
{
  if ( settings )
  {
    QDomDocument doc;
    QgsReadWriteContext rwContext;
    rwContext.setPathResolver( QgsProject::instance()->pathResolver() ); // skip-keyword-check
    QDomElement elem = doc.createElement( u"rampSettings"_s );
    settings->writeXml( doc, elem, rwContext );
    doc.appendChild( elem );
    nodeLayer->setCustomProperty( "legend/custom-ramp-settings-" + QString::number( originalIndex ), doc.toString() );
  }
  else
    nodeLayer->removeCustomProperty( "legend/custom-ramp-settings-" + QString::number( originalIndex ) );
}
 
QgsColorRampLegendNodeSettings *QgsMapLayerLegendUtils::legendNodeColorRampSettings( QgsLayerTreeLayer *nodeLayer, int originalIndex )
{
  const QString settingsDef = nodeLayer->customProperty( "legend/custom-ramp-settings-" + QString::number( originalIndex ) ).toString();
  if ( settingsDef.isEmpty() )
    return nullptr;
 
  QDomDocument doc;
  doc.setContent( settingsDef );
  const QDomElement elem = doc.documentElement();
 
  QgsReadWriteContext rwContext;
  rwContext.setPathResolver( QgsProject::instance()->pathResolver() ); // skip-keyword-check
 
  QgsColorRampLegendNodeSettings settings;
  settings.readXml( elem, rwContext );
  return new QgsColorRampLegendNodeSettings( std::move( settings ) );
}
 
void QgsMapLayerLegendUtils::setLegendNodeColumnBreak( QgsLayerTreeLayer *nodeLayer, int originalIndex, bool columnBreakBeforeNode )
{
  if ( columnBreakBeforeNode )
    nodeLayer->setCustomProperty( "legend/column-break-" + QString::number( originalIndex ), u"1"_s );
  else
    nodeLayer->removeCustomProperty( "legend/column-break-" + QString::number( originalIndex ) );
}
 
bool QgsMapLayerLegendUtils::legendNodeColumnBreak( QgsLayerTreeLayer *nodeLayer, int originalIndex )
{
  return nodeLayer->customProperty( "legend/column-break-" + QString::number( originalIndex ) ).toInt();
}
 
void QgsMapLayerLegendUtils::applyLayerNodeProperties( QgsLayerTreeLayer *nodeLayer, QList<QgsLayerTreeModelLegendNode *> &nodes )
{
  // handle user labels
  int i = 0;
  const auto constNodes = nodes;
  for ( QgsLayerTreeModelLegendNode *legendNode : constNodes )
  {
    const QString userLabel = QgsMapLayerLegendUtils::legendNodeUserLabel( nodeLayer, i );
    if ( !userLabel.isNull() )
      legendNode->setUserLabel( userLabel );
 
    if ( QgsSymbolLegendNode *symbolNode = dynamic_cast< QgsSymbolLegendNode * >( legendNode ) )
    {
      const QgsLegendPatchShape shape = QgsMapLayerLegendUtils::legendNodePatchShape( nodeLayer, i );
      symbolNode->setPatchShape( shape );
 
      symbolNode->setCustomSymbol( QgsMapLayerLegendUtils::legendNodeCustomSymbol( nodeLayer, i ).release() );
    }
    else if ( QgsColorRampLegendNode *colorRampNode = dynamic_cast< QgsColorRampLegendNode * >( legendNode ) )
    {
      const std::unique_ptr< QgsColorRampLegendNodeSettings > settings( QgsMapLayerLegendUtils::legendNodeColorRampSettings( nodeLayer, i ) );
      if ( settings )
      {
        colorRampNode->setSettings( *settings );
      }
    }
 
    const QSizeF userSize = QgsMapLayerLegendUtils::legendNodeSymbolSize( nodeLayer, i );
    if ( userSize.isValid() )
    {
      legendNode->setUserPatchSize( userSize );
    }
 
    if ( legendNodeColumnBreak( nodeLayer, i ) )
      legendNode->setColumnBreak( true );
 
    i++;
  }
 
  // handle user order of nodes
  if ( QgsMapLayerLegendUtils::hasLegendNodeOrder( nodeLayer ) )
  {
    const QList<int> order = QgsMapLayerLegendUtils::legendNodeOrder( nodeLayer );
 
    QList<QgsLayerTreeModelLegendNode *> newOrder;
    QSet<int> usedIndices;
    const auto constOrder = order;
    for ( const int idx : constOrder )
    {
      if ( usedIndices.contains( idx ) )
      {
        QgsDebugError( u"invalid node order. ignoring."_s );
        return;
      }
 
      newOrder << nodes[idx];
      usedIndices << idx;
    }
 
    // delete unused nodes
    for ( int i = 0; i < nodes.count(); ++i )
    {
      if ( !usedIndices.contains( i ) )
        delete nodes[i];
    }
 
    nodes = newOrder;
  }
 
}
 
// -------------------------------------------------------------------------
 
 
QgsDefaultVectorLayerLegend::QgsDefaultVectorLayerLegend( QgsVectorLayer *vl )
  : mLayer( vl )
{
  connect( mLayer, &QgsMapLayer::rendererChanged, this, &QgsMapLayerLegend::itemsChanged );
  connect( mLayer, &QgsMapLayer::nameChanged, this, &QgsMapLayerLegend::itemsChanged );
}
 
QList<QgsLayerTreeModelLegendNode *> QgsDefaultVectorLayerLegend::createLayerTreeModelLegendNodes( QgsLayerTreeLayer *nodeLayer )
{
  QList<QgsLayerTreeModelLegendNode *> nodes;
  if ( !mLayer )
    return nodes;
 
  const QString placeholderImage = mLayer->legendPlaceholderImage();
  if ( !placeholderImage.isEmpty() )
  {
    bool fitsInCache;
    const QImage img = QgsApplication::imageCache()->pathAsImage( placeholderImage, QSize(), false, 1.0, fitsInCache );
    nodes << new QgsImageLegendNode( nodeLayer, img );
    return nodes;
  }
 
  QgsFeatureRenderer *r = mLayer->renderer();
  if ( !r )
    return nodes;
 
  if ( nodeLayer->customProperty( u"showFeatureCount"_s, 0 ).toBool() )
    mLayer->countSymbolFeatures();
 
  const QgsSettings settings;
  if ( settings.value( u"qgis/showLegendClassifiers"_s, false ).toBool() && !r->legendClassificationAttribute().isEmpty() )
  {
    nodes.append( new QgsSimpleLegendNode( nodeLayer, r->legendClassificationAttribute() ) );
  }
 
  const QList<QgsLayerTreeModelLegendNode *> rendererNodes = r->createLegendNodes( nodeLayer );
  for ( QgsLayerTreeModelLegendNode *node : rendererNodes )
  {
    if ( QgsSymbolLegendNode *legendNode = qobject_cast< QgsSymbolLegendNode *>( node ) )
    {
      const QString ruleKey = legendNode->data( static_cast< int >( QgsLayerTreeModelLegendNode::CustomRole::RuleKey ) ).toString();
      if ( mTextOnSymbolEnabled && mTextOnSymbolContent.contains( ruleKey ) )
      {
        legendNode->setTextOnSymbolLabel( mTextOnSymbolContent.value( ruleKey ) );
        legendNode->setTextOnSymbolTextFormat( mTextOnSymbolTextFormat );
      }
    }
    nodes << node;
  }
 
  if ( nodes.count() == 1 && nodes[0]->data( Qt::EditRole ).toString().isEmpty() && qobject_cast< QgsSymbolLegendNode * >( nodes[0] ) )
    nodes[0]->setEmbeddedInParent( true );
 
  if ( mLayer->diagramsEnabled() )
  {
    const auto constLegendItems = mLayer->diagramRenderer()->legendItems( nodeLayer );
    for ( QgsLayerTreeModelLegendNode *i : constLegendItems )
    {
      nodes.append( i );
    }
  }
 
  if ( mLayer->labelsEnabled() && mShowLabelLegend )
  {
    const QgsAbstractVectorLayerLabeling *labeling = mLayer->labeling();
    if ( labeling )
    {
      const QStringList pList = labeling->subProviders();
      for ( int i = 0; i < pList.size(); ++i )
      {
        const QgsPalLayerSettings s = labeling->settings( pList.at( i ) );
        QString description;
        const QgsRuleBasedLabeling *ruleBasedLabeling = dynamic_cast<const QgsRuleBasedLabeling *>( labeling );
        if ( ruleBasedLabeling && ruleBasedLabeling->rootRule() )
        {
          const QgsRuleBasedLabeling::Rule *rule = ruleBasedLabeling->rootRule()->findRuleByKey( pList.at( i ) );
          if ( rule )
          {
            description = rule->description();
          }
        }
        QgsVectorLabelLegendNode *node = new QgsVectorLabelLegendNode( nodeLayer, s );
        node->setUserLabel( description );
        nodes.append( node );
      }
    }
  }
 
  return nodes;
}
 
void QgsDefaultVectorLayerLegend::readXml( const QDomElement &elem, const QgsReadWriteContext &context )
{
  QgsMapLayerLegend::readXml( elem, context );
 
  mTextOnSymbolEnabled = false;
  mTextOnSymbolTextFormat = QgsTextFormat();
  mTextOnSymbolContent.clear();
 
  mShowLabelLegend = elem.attribute( u"showLabelLegend"_s, u"0"_s ).compare( u"1"_s, Qt::CaseInsensitive ) == 0;
 
  const QDomElement tosElem = elem.firstChildElement( u"text-on-symbol"_s );
  if ( !tosElem.isNull() )
  {
    mTextOnSymbolEnabled = true;
    const QDomElement tosFormatElem = tosElem.firstChildElement( u"text-style"_s );
    mTextOnSymbolTextFormat.readXml( tosFormatElem, context );
    const QDomElement tosContentElem = tosElem.firstChildElement( u"content"_s );
    QDomElement tosContentItemElem = tosContentElem.firstChildElement( u"item"_s );
    while ( !tosContentItemElem.isNull() )
    {
      mTextOnSymbolContent.insert( tosContentItemElem.attribute( u"key"_s ), tosContentItemElem.attribute( u"value"_s ) );
      tosContentItemElem = tosContentItemElem.nextSiblingElement( u"item"_s );
    }
  }
}
 
QDomElement QgsDefaultVectorLayerLegend::writeXml( QDomDocument &doc, const QgsReadWriteContext &context ) const
{
  QDomElement elem = QgsMapLayerLegend::writeXml( doc, context );
  elem.setAttribute( u"type"_s, u"default-vector"_s );
  elem.setAttribute( u"showLabelLegend"_s, mShowLabelLegend );
 
  if ( mTextOnSymbolEnabled )
  {
    QDomElement tosElem = doc.createElement( u"text-on-symbol"_s );
    const QDomElement tosFormatElem = mTextOnSymbolTextFormat.writeXml( doc, context );
    tosElem.appendChild( tosFormatElem );
    QDomElement tosContentElem = doc.createElement( u"content"_s );
    for ( auto it = mTextOnSymbolContent.constBegin(); it != mTextOnSymbolContent.constEnd(); ++it )
    {
      QDomElement tosContentItemElem = doc.createElement( u"item"_s );
      tosContentItemElem.setAttribute( u"key"_s, it.key() );
      tosContentItemElem.setAttribute( u"value"_s, it.value() );
      tosContentElem.appendChild( tosContentItemElem );
    }
    tosElem.appendChild( tosContentElem );
    elem.appendChild( tosElem );
  }
 
  return elem;
}
 
 
// -------------------------------------------------------------------------
 
 
QgsDefaultRasterLayerLegend::QgsDefaultRasterLayerLegend( QgsRasterLayer *rl )
  : mLayer( rl )
{
  connect( mLayer, &QgsMapLayer::rendererChanged, this, &QgsMapLayerLegend::itemsChanged );
}
 
QList<QgsLayerTreeModelLegendNode *> QgsDefaultRasterLayerLegend::createLayerTreeModelLegendNodes( QgsLayerTreeLayer *nodeLayer )
{
  QList<QgsLayerTreeModelLegendNode *> nodes;
 
  // temporary solution for WMS. Ideally should be done with a delegate.
  if ( mLayer->dataProvider() && mLayer->dataProvider()->supportsLegendGraphic() )
  {
    nodes << new QgsWmsLegendNode( nodeLayer );
  }
 
  const QString placeholderImage = mLayer->legendPlaceholderImage();
  if ( !placeholderImage.isEmpty() )
  {
    bool fitsInCache;
    const QImage img = QgsApplication::imageCache()->pathAsImage( placeholderImage, QSize(), false, 1.0, fitsInCache );
    nodes << new QgsImageLegendNode( nodeLayer, img );
  }
  else if ( mLayer->renderer() )
    nodes.append( mLayer->renderer()->createLegendNodes( nodeLayer ) );
  return nodes;
}
 
// -------------------------------------------------------------------------
 
QgsDefaultMeshLayerLegend::QgsDefaultMeshLayerLegend( QgsMeshLayer *ml )
  : mLayer( ml )
{
  connect( mLayer, &QgsMapLayer::rendererChanged, this, &QgsMapLayerLegend::itemsChanged );
}
 
QList<QgsLayerTreeModelLegendNode *> QgsDefaultMeshLayerLegend::createLayerTreeModelLegendNodes( QgsLayerTreeLayer *nodeLayer )
{
  QList<QgsLayerTreeModelLegendNode *> nodes;
 
  const QgsMeshRendererSettings rendererSettings = mLayer->rendererSettings();
 
  const int indexScalar = rendererSettings.activeScalarDatasetGroup();
  const int indexVector = rendererSettings.activeVectorDatasetGroup();
 
  QString name;
  if ( indexScalar > -1 && indexVector > -1 && indexScalar != indexVector )
    name = QString( "%1 / %2" ).arg( mLayer->datasetGroupMetadata( indexScalar ).name(), mLayer->datasetGroupMetadata( indexVector ).name() );
  else if ( indexScalar > -1 )
    name = mLayer->datasetGroupMetadata( indexScalar ).name();
  else if ( indexVector > -1 )
    name = mLayer->datasetGroupMetadata( indexVector ).name();
  else
  {
    // neither contours nor vectors get rendered - no legend needed
    return nodes;
  }
 
  if ( indexScalar > -1 )
  {
    const QString scalarNameKey = u"scalarName"_s;
    nodes << new QgsSimpleLegendNode( nodeLayer, mLayer->datasetGroupMetadata( indexScalar ).name(),
                                      QIcon(), nullptr, scalarNameKey );
    const QgsMeshRendererScalarSettings settings = rendererSettings.scalarSettings( indexScalar );
    const QgsColorRampShader shader = settings.colorRampShader();
    switch ( shader.colorRampType() )
    {
      case Qgis::ShaderInterpolationMethod::Linear:
        if ( !shader.legendSettings() || shader.legendSettings()->useContinuousLegend() )
        {
          // for interpolated shaders we use a ramp legend node
          if ( !shader.colorRampItemList().isEmpty() )
          {
            nodes << new QgsColorRampLegendNode( nodeLayer, shader.createColorRamp(),
                                                 shader.legendSettings() ? *shader.legendSettings() : QgsColorRampLegendNodeSettings(),
                                                 shader.minimumValue(),
                                                 shader.maximumValue(),
                                                 nullptr,
                                                 u"scalarLegend"_s,
                                                 scalarNameKey );
          }
          break;
        }
        [[fallthrough]];
      case Qgis::ShaderInterpolationMethod::Discrete:
      case Qgis::ShaderInterpolationMethod::Exact:
      {
        // for all others we use itemised lists
        QgsLegendColorList items;
        settings.colorRampShader().legendSymbologyItems( items );
        for ( const QPair< QString, QColor > &item : items )
        {
          nodes << new QgsRasterSymbolLegendNode( nodeLayer, item.second, item.first, nullptr, false,
                                                  u"scalarLegend"_s + QUuid::createUuid().toString(),
                                                  scalarNameKey
                                                );
        }
        break;
      }
    }
  }
 
  if ( indexVector > -1 )
  {
    const QgsMeshRendererVectorSettings settings = rendererSettings.vectorSettings( indexVector );
    const QString vectorNameKey = u"vectorName"_s;
    switch ( settings.coloringMethod() )
    {
      case QgsInterpolatedLineColor::ColoringMethod::SingleColor:
      {
        const QColor arrowColor = settings.color();
        const QIcon vectorIcon = QgsApplication::getThemeIcon( u"/propertyicons/meshvectors.svg"_s, arrowColor, arrowColor );
        nodes << new QgsSimpleLegendNode( nodeLayer, mLayer->datasetGroupMetadata( indexVector ).name(),
                                          vectorIcon, nullptr, vectorNameKey );
        break;
      }
      case QgsInterpolatedLineColor::ColoringMethod::ColorRamp:
      {
        const QIcon vectorIcon = QgsApplication::getThemeIcon( u"/propertyicons/meshvectors.svg"_s );
        nodes << new QgsSimpleLegendNode( nodeLayer, mLayer->datasetGroupMetadata( indexVector ).name(),
                                          vectorIcon, nullptr, vectorNameKey );
        const QgsColorRampShader shader = settings.colorRampShader();
        switch ( shader.colorRampType() )
        {
          case Qgis::ShaderInterpolationMethod::Linear:
            if ( !shader.legendSettings() || shader.legendSettings()->useContinuousLegend() )
            {
              // for interpolated shaders we use a ramp legend node
              if ( !shader.colorRampItemList().isEmpty() )
              {
                nodes << new QgsColorRampLegendNode( nodeLayer, shader.createColorRamp(),
                                                     shader.legendSettings() ? *shader.legendSettings() : QgsColorRampLegendNodeSettings(),
                                                     shader.minimumValue(),
                                                     shader.maximumValue(),
                                                     nullptr,
                                                     u"vectorLegend"_s,
                                                     vectorNameKey );
              }
              break;
            }
            [[fallthrough]];
          case Qgis::ShaderInterpolationMethod::Discrete:
          case Qgis::ShaderInterpolationMethod::Exact:
          {
            // for all others we use itemised lists
            QgsLegendColorList items;
            settings.colorRampShader().legendSymbologyItems( items );
            for ( const QPair< QString, QColor > &item : items )
            {
              nodes << new QgsRasterSymbolLegendNode( nodeLayer, item.second, item.first, nullptr, false,
                                                      u"vectorLegend"_s + QUuid::createUuid().toString(),
                                                      vectorNameKey
                                                    );
            }
            break;
          }
          break;
        }
      }
    }
  }
 
  return nodes;
}
 
//
// QgsDefaultPointCloudLayerLegend
//
 
QgsDefaultPointCloudLayerLegend::QgsDefaultPointCloudLayerLegend( QgsPointCloudLayer *layer )
  : mLayer( layer )
{
  connect( mLayer, &QgsMapLayer::rendererChanged, this, &QgsMapLayerLegend::itemsChanged );
}
 
QList<QgsLayerTreeModelLegendNode *> QgsDefaultPointCloudLayerLegend::createLayerTreeModelLegendNodes( QgsLayerTreeLayer *nodeLayer )
{
  QgsPointCloudRenderer *renderer = mLayer->renderer();
  if ( !renderer )
    return QList<QgsLayerTreeModelLegendNode *>();
 
  return renderer->createLegendNodes( nodeLayer );
}