qgspointcloudrendererpropertieswidget.cpp

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/***************************************************************************
    qgspointcloudrendererpropertieswidget.cpp
    ---------------------
    begin                : November 2020
    copyright            : (C) 2020 by Nyall Dawson
    email                : nyall dot dawson 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 "qgspointcloudrendererpropertieswidget.h"
 
#include "qgis.h"
#include "qgsapplication.h"
#include "qgselevationshadingrenderer.h"
#include "qgsexpressioncontextutils.h"
#include "qgsfieldexpressionwidget.h"
#include "qgsfontbutton.h"
#include "qgslogger.h"
#include "qgspointcloudattributebyramprendererwidget.h"
#include "qgspointcloudclassifiedrendererwidget.h"
#include "qgspointcloudextentrenderer.h"
#include "qgspointcloudextentrendererwidget.h"
#include "qgspointcloudlayer.h"
#include "qgspointcloudrenderer.h"
#include "qgspointcloudrendererregistry.h"
#include "qgspointcloudrendererwidget.h"
#include "qgspointcloudrgbrendererwidget.h"
#include "qgsproject.h"
#include "qgsprojectutils.h"
#include "qgsproperty.h"
#include "qgsstyle.h"
#include "qgssymbolwidgetcontext.h"
#include "qgstextformatwidget.h"
#include "qgsvirtualpointcloudprovider.h"
 
#include <QString>
 
#include "moc_qgspointcloudrendererpropertieswidget.cpp"
 
using namespace Qt::StringLiterals;
 
static bool initPointCloudRenderer( const QString &name, QgsPointCloudRendererWidgetFunc f, const QString &iconName = QString() )
{
  QgsPointCloudRendererAbstractMetadata *rendererAbstractMetadata = QgsApplication::pointCloudRendererRegistry()->rendererMetadata( name );
  if ( !rendererAbstractMetadata )
    return false;
  QgsPointCloudRendererMetadata *rendererMetadata = dynamic_cast<QgsPointCloudRendererMetadata *>( rendererAbstractMetadata );
  if ( !rendererMetadata )
    return false;
 
  rendererMetadata->setWidgetFunction( f );
 
  if ( !iconName.isEmpty() )
  {
    rendererMetadata->setIcon( QgsApplication::getThemeIcon( iconName ) );
  }
 
  QgsDebugMsgLevel( "Set for " + name, 2 );
  return true;
}
 
void QgsPointCloudRendererPropertiesWidget::initRendererWidgetFunctions()
{
  static bool sInitialized = false;
  if ( sInitialized )
    return;
 
  initPointCloudRenderer( u"extent"_s, QgsPointCloudExtentRendererWidget::create, u"styleicons/pointcloudextent.svg"_s );
  initPointCloudRenderer( u"rgb"_s, QgsPointCloudRgbRendererWidget::create, u"styleicons/multibandcolor.svg"_s );
  initPointCloudRenderer( u"ramp"_s, QgsPointCloudAttributeByRampRendererWidget::create, u"styleicons/singlebandpseudocolor.svg"_s );
  initPointCloudRenderer( u"classified"_s, QgsPointCloudClassifiedRendererWidget::create, u"styleicons/paletted.svg"_s );
 
  sInitialized = true;
}
 
QgsPointCloudRendererPropertiesWidget::QgsPointCloudRendererPropertiesWidget( QgsPointCloudLayer *layer, QgsStyle *style, QWidget *parent )
  : QgsMapLayerConfigWidget( layer, nullptr, parent )
  , mLayer( layer )
  , mStyle( style )
{
  setupUi( this );
 
  layout()->setContentsMargins( 0, 0, 0, 0 );
 
  // initialize registry's widget functions
  initRendererWidgetFunctions();
 
  QgsPointCloudRendererRegistry *reg = QgsApplication::pointCloudRendererRegistry();
  const QStringList renderers = reg->renderersList();
  for ( const QString &name : renderers )
  {
    if ( QgsPointCloudRendererAbstractMetadata *m = reg->rendererMetadata( name ) )
      cboRenderers->addItem( m->icon(), m->visibleName(), name );
  }
 
  cboRenderers->setCurrentIndex( -1 ); // set no current renderer
 
  mPointStyleComboBox->addItem( tr( "Square" ), QVariant::fromValue( Qgis::PointCloudSymbol::Square ) );
  mPointStyleComboBox->addItem( tr( "Circle" ), QVariant::fromValue( Qgis::PointCloudSymbol::Circle ) );
 
  connect( cboRenderers, static_cast<void ( QComboBox::* )( int )>( &QComboBox::currentIndexChanged ), this, &QgsPointCloudRendererPropertiesWidget::rendererChanged );
 
  connect( mBlendModeComboBox, static_cast<void ( QComboBox::* )( int )>( &QComboBox::currentIndexChanged ), this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
  connect( mOpacityWidget, &QgsOpacityWidget::opacityChanged, this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
 
  mPointSizeUnitWidget->setUnits(
    { Qgis::RenderUnit::Millimeters, Qgis::RenderUnit::MetersInMapUnits, Qgis::RenderUnit::MapUnits, Qgis::RenderUnit::Pixels, Qgis::RenderUnit::Points, Qgis::RenderUnit::Inches }
  );
 
  connect( mPointSizeSpinBox, qOverload<double>( &QgsDoubleSpinBox::valueChanged ), this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
  connect( mPointSizeUnitWidget, &QgsUnitSelectionWidget::changed, this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
 
  mDrawOrderComboBox->addItem( tr( "Default" ), QVariant::fromValue( Qgis::PointCloudDrawOrder::Default ) );
  mDrawOrderComboBox->addItem( tr( "Bottom to Top" ), QVariant::fromValue( Qgis::PointCloudDrawOrder::BottomToTop ) );
  mDrawOrderComboBox->addItem( tr( "Top to Bottom" ), QVariant::fromValue( Qgis::PointCloudDrawOrder::TopToBottom ) );
 
  connect( mDirectionalLightWidget, &QgsDirectionalLightWidget::directionChanged, this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
 
  mEdlDistanceSpinBox->setClearValue( 0.5 );
  mEdlStrengthSpinBox->setClearValue( 1000 );
  connect( mEdlStrengthSpinBox, qOverload<double>( &QDoubleSpinBox::valueChanged ), this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
  connect( mEdlDistanceSpinBox, qOverload<double>( &QDoubleSpinBox::valueChanged ), this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
  connect( mEdlDistanceUnit, &QgsUnitSelectionWidget::changed, this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
 
  mHillshadingZFactorSpinBox->setClearValue( 1.0 );
  connect( mHillshadingZFactorSpinBox, qOverload<double>( &QDoubleSpinBox::valueChanged ), this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
  connect( mHillshadingMultidirCheckBox, &QCheckBox::toggled, this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
 
  mMaxErrorUnitWidget->setUnits(
    { Qgis::RenderUnit::Millimeters, Qgis::RenderUnit::MetersInMapUnits, Qgis::RenderUnit::MapUnits, Qgis::RenderUnit::Pixels, Qgis::RenderUnit::Points, Qgis::RenderUnit::Inches }
  );
  mMaxErrorSpinBox->setClearValue( 0.3 );
 
  mHorizontalTriangleThresholdSpinBox->setClearValue( 5.0 );
  mHorizontalTriangleUnitWidget->setUnits(
    { Qgis::RenderUnit::Millimeters, Qgis::RenderUnit::MetersInMapUnits, Qgis::RenderUnit::MapUnits, Qgis::RenderUnit::Pixels, Qgis::RenderUnit::Points, Qgis::RenderUnit::Inches }
  );
 
  connect( mMaxErrorSpinBox, qOverload<double>( &QgsDoubleSpinBox::valueChanged ), this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
  connect( mMaxErrorUnitWidget, &QgsUnitSelectionWidget::changed, this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
 
  connect( mPointStyleComboBox, static_cast<void ( QComboBox::* )( int )>( &QComboBox::currentIndexChanged ), this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
  connect( mDrawOrderComboBox, static_cast<void ( QComboBox::* )( int )>( &QComboBox::currentIndexChanged ), this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
 
  connect( mEyeDomeLightingGroupBox, &QGroupBox::toggled, this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
  connect( mHillshadeGroupBox, &QGroupBox::toggled, this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
 
  connect( mTriangulateGroupBox, &QGroupBox::toggled, this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
  connect( mHorizontalTriangleCheckBox, &QCheckBox::clicked, this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
  connect( mHorizontalTriangleThresholdSpinBox, qOverload<double>( &QgsDoubleSpinBox::valueChanged ), this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
  connect( mHorizontalTriangleUnitWidget, &QgsUnitSelectionWidget::changed, this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
 
  connect( mColorExpressionWidget, qOverload<const QString &>( &QgsFieldExpressionWidget::fieldChanged ), this, &QgsPointCloudRendererPropertiesWidget::updateDataDefinedProperty );
  // show virtual point cloud options only when vpc layer is selected
  if ( !mLayer->dataProvider()->subIndexes().isEmpty() )
  {
    mLabelOptions->setDialogTitle( tr( "Customize label text" ) );
    mLabelOptions->setText( tr( "Label format" ) );
    connect( mLabels, &QCheckBox::stateChanged, this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
    connect( mLabelOptions, &QgsFontButton::changed, this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
    mZoomOutOptions->addItem( tr( "Show Extents Only" ), QVariant::fromValue( Qgis::PointCloudZoomOutRenderBehavior::RenderExtents ) );
 
    if ( const QgsVirtualPointCloudProvider *vpcProvider = dynamic_cast<QgsVirtualPointCloudProvider *>( mLayer->dataProvider() ) )
    {
      if ( !vpcProvider->overviews().isEmpty() )
      {
        mZoomOutOptions->addItem( tr( "Show Overview Only" ), QVariant::fromValue( Qgis::PointCloudZoomOutRenderBehavior::RenderOverview ) );
        mZoomOutOptions->addItem( tr( "Show Extents Over Overview" ), QVariant::fromValue( Qgis::PointCloudZoomOutRenderBehavior::RenderOverviewAndExtents ) );
      }
 
      for ( auto it = mOverviewSwitchingScaleMap.constBegin(); it != mOverviewSwitchingScaleMap.constEnd(); ++it )
      {
        mOverviewSwitchingScale->addItem( it.value(), it.key() );
      }
      setOverviewSwitchingScale( 1.0 );
    }
    else
    {
      mZoomOutOptions->setEnabled( false );
      mOverviewSwitchingScale->setEnabled( false );
    }
 
    connect( mOverviewSwitchingScale, static_cast<void ( QComboBox::* )( int )>( &QComboBox::currentIndexChanged ), this, &QgsPointCloudRendererPropertiesWidget::emitWidgetChanged );
 
    connect( mZoomOutOptions, qOverload<int>( &QComboBox::currentIndexChanged ), this, [this]( int ) {
      switch ( mZoomOutOptions->currentData().value<Qgis::PointCloudZoomOutRenderBehavior>() )
      {
        case Qgis::PointCloudZoomOutRenderBehavior::RenderOverview:
          mLabels->setEnabled( false );
          mLabelOptions->setEnabled( false );
          break;
        case Qgis::PointCloudZoomOutRenderBehavior::RenderExtents:
        case Qgis::PointCloudZoomOutRenderBehavior::RenderOverviewAndExtents:
          mLabels->setEnabled( true );
          mLabelOptions->setEnabled( true );
      }
      emitWidgetChanged();
    } );
  }
  else
  {
    mVpcGroupBox->setVisible( false );
  }
 
  syncToLayer( layer );
}
 
void QgsPointCloudRendererPropertiesWidget::setContext( const QgsSymbolWidgetContext &context )
{
  mContext = context;
  mMapCanvas = context.mapCanvas();
  mMessageBar = context.messageBar();
  if ( mActiveWidget )
  {
    mActiveWidget->setContext( context );
  }
}
 
void QgsPointCloudRendererPropertiesWidget::syncToLayer( QgsMapLayer *layer )
{
  mLayer = qobject_cast<QgsPointCloudLayer *>( layer );
 
  mBlockChangedSignal = true;
  mOpacityWidget->setOpacity( mLayer->opacity() );
  mBlendModeComboBox->setShowClippingModes( QgsProjectUtils::layerIsContainedInGroupLayer( QgsProject::instance(), mLayer ) );
  mBlendModeComboBox->setBlendMode( mLayer->blendMode() );
 
  if ( mLayer->renderer() )
  {
    // set current renderer from layer
    const QString rendererName = mLayer->renderer()->type();
 
    const int rendererIdx = cboRenderers->findData( rendererName );
    if ( cboRenderers->currentIndex() != rendererIdx )
    {
      cboRenderers->setCurrentIndex( rendererIdx );
    }
    else
    {
      rendererChanged();
    }
 
    // no renderer found... this mustn't happen
    Q_ASSERT( rendererIdx != -1 && "there must be a renderer!" );
 
    mPointSizeSpinBox->setValue( mLayer->renderer()->pointSize() );
    mPointSizeUnitWidget->setUnit( mLayer->renderer()->pointSizeUnit() );
    mPointSizeUnitWidget->setMapUnitScale( mLayer->renderer()->pointSizeMapUnitScale() );
 
    mPointStyleComboBox->setCurrentIndex( mPointStyleComboBox->findData( QVariant::fromValue( mLayer->renderer()->pointSymbol() ) ) );
    mDrawOrderComboBox->setCurrentIndex( mDrawOrderComboBox->findData( QVariant::fromValue( mLayer->renderer()->drawOrder2d() ) ) );
 
    mMaxErrorSpinBox->setValue( mLayer->renderer()->maximumScreenError() );
    mMaxErrorUnitWidget->setUnit( mLayer->renderer()->maximumScreenErrorUnit() );
    setOverviewSwitchingScale( mLayer->renderer()->overviewSwitchingScale() );
 
    mTriangulateGroupBox->setChecked( mLayer->renderer()->renderAsTriangles() );
    mHorizontalTriangleCheckBox->setChecked( mLayer->renderer()->horizontalTriangleFilter() );
    mHorizontalTriangleThresholdSpinBox->setValue( mLayer->renderer()->horizontalTriangleFilterThreshold() );
    mHorizontalTriangleUnitWidget->setUnit( mLayer->renderer()->horizontalTriangleFilterUnit() );
 
    if ( !mLayer->dataProvider()->subIndexes().isEmpty() )
    {
      mLabels->setChecked( mLayer->renderer()->showLabels() );
      mLabelOptions->setTextFormat( mLayer->renderer()->labelTextFormat() );
      mZoomOutOptions->setCurrentIndex( mZoomOutOptions->findData( QVariant::fromValue( mLayer->renderer()->zoomOutBehavior() ) ) );
      switch ( mLayer->renderer()->zoomOutBehavior() )
      {
        case Qgis::PointCloudZoomOutRenderBehavior::RenderOverview:
          mLabels->setEnabled( false );
          mLabelOptions->setEnabled( false );
          break;
        default:
          mLabels->setEnabled( true );
          mLabelOptions->setEnabled( true );
      }
    }
 
    QgsElevationShadingRenderer shadingRenderer = mLayer->renderer()->elevationShadingRenderer();
 
    mEyeDomeLightingGroupBox->setChecked( shadingRenderer.isActiveEyeDomeLighting() );
    mHillshadeGroupBox->setChecked( shadingRenderer.isActiveHillshading() );
 
    mEdlStrengthSpinBox->setValue( shadingRenderer.eyeDomeLightingStrength() );
    mEdlDistanceSpinBox->setValue( shadingRenderer.eyeDomeLightingDistance() );
    mEdlDistanceUnit->setUnits(
      { Qgis::RenderUnit::Millimeters, Qgis::RenderUnit::MetersInMapUnits, Qgis::RenderUnit::MapUnits, Qgis::RenderUnit::Pixels, Qgis::RenderUnit::Points, Qgis::RenderUnit::Inches }
    );
    mEdlDistanceUnit->setUnit( shadingRenderer.eyeDomeLightingDistanceUnit() );
    mHillshadingMultidirCheckBox->setChecked( shadingRenderer.isHillshadingMultidirectional() );
    mHillshadingZFactorSpinBox->setValue( shadingRenderer.hillshadingZFactor() );
 
    mDirectionalLightWidget->setAltitude( shadingRenderer.lightAltitude() );
    mDirectionalLightWidget->setAzimuth( shadingRenderer.lightAzimuth() );
    mDirectionalLightWidget->setEnableAzimuth( !mHillshadingMultidirCheckBox->isChecked() );
  }
 
  mColorExpressionWidget->setLayer( layer );
  mColorExpressionWidget->registerExpressionContextGenerator( this );
 
  mDataDefinedProperties = mLayer->renderer()->dataDefinedProperties();
  const QgsProperty colorProperty = mDataDefinedProperties.property( QgsPointCloudRenderer::Property::Color );
  mColorExpressionWidget->setExpression( colorProperty.expressionString() );
 
  mBlockChangedSignal = false;
}
 
void QgsPointCloudRendererPropertiesWidget::setDockMode( bool dockMode )
{
  if ( mActiveWidget )
    mActiveWidget->setDockMode( dockMode );
  QgsMapLayerConfigWidget::setDockMode( dockMode );
}
 
void QgsPointCloudRendererPropertiesWidget::apply()
{
  mLayer->setOpacity( mOpacityWidget->opacity() );
  mLayer->setBlendMode( mBlendModeComboBox->blendMode() );
 
  if ( mActiveWidget )
    mLayer->setRenderer( mActiveWidget->renderer() );
  else if ( !cboRenderers->currentData().toString().isEmpty() )
  {
    QDomElement elem;
    if ( QgsPointCloudRendererAbstractMetadata *metadata = QgsApplication::pointCloudRendererRegistry()->rendererMetadata( cboRenderers->currentData().toString() ) )
    {
      mLayer->setRenderer( metadata->createRenderer( elem, QgsReadWriteContext() ) );
    }
  }
 
  mLayer->renderer()->setPointSize( mPointSizeSpinBox->value() );
  mLayer->renderer()->setPointSizeUnit( mPointSizeUnitWidget->unit() );
  mLayer->renderer()->setPointSizeMapUnitScale( mPointSizeUnitWidget->getMapUnitScale() );
 
  mLayer->renderer()->setPointSymbol( mPointStyleComboBox->currentData().value<Qgis::PointCloudSymbol>() );
 
  mLayer->renderer()->setMaximumScreenError( mMaxErrorSpinBox->value() );
  mLayer->renderer()->setMaximumScreenErrorUnit( mMaxErrorUnitWidget->unit() );
  mLayer->renderer()->setDrawOrder2d( mDrawOrderComboBox->currentData().value<Qgis::PointCloudDrawOrder>() );
 
  mLayer->renderer()->setRenderAsTriangles( mTriangulateGroupBox->isChecked() );
  mLayer->renderer()->setHorizontalTriangleFilter( mHorizontalTriangleCheckBox->isChecked() );
  mLayer->renderer()->setHorizontalTriangleFilterThreshold( mHorizontalTriangleThresholdSpinBox->value() );
  mLayer->renderer()->setHorizontalTriangleFilterUnit( mHorizontalTriangleUnitWidget->unit() );
 
  mLayer->renderer()->setShowLabels( mLabels->isChecked() );
  mLayer->renderer()->setLabelTextFormat( mLabelOptions->textFormat() );
  mLayer->renderer()->setZoomOutBehavior( mZoomOutOptions->currentData().value<Qgis::PointCloudZoomOutRenderBehavior>() );
 
  mLayer->renderer()->setOverviewSwitchingScale( overviewSwitchingScale() );
 
  QgsElevationShadingRenderer shadingRenderer;
 
  shadingRenderer.setActiveEyeDomeLighting( mEyeDomeLightingGroupBox->isChecked() );
  shadingRenderer.setActiveHillshading( mHillshadeGroupBox->isChecked() );
  shadingRenderer.setActive( mEyeDomeLightingGroupBox->isChecked() || mHillshadeGroupBox->isChecked() );
  shadingRenderer.setEyeDomeLightingStrength( mEdlStrengthSpinBox->value() );
  shadingRenderer.setEyeDomeLightingDistance( mEdlDistanceSpinBox->value() );
  shadingRenderer.setEyeDomeLightingDistanceUnit( mEdlDistanceUnit->unit() );
  shadingRenderer.setHillshadingMultidirectional( mHillshadingMultidirCheckBox->isChecked() );
  shadingRenderer.setHillshadingZFactor( mHillshadingZFactorSpinBox->value() );
 
  shadingRenderer.setLightAltitude( mDirectionalLightWidget->altitude() );
  shadingRenderer.setLightAzimuth( mDirectionalLightWidget->azimuth() );
 
  mLayer->renderer()->setElevationShadingRenderer( shadingRenderer );
  mLayer->renderer()->setDataDefinedProperties( mDataDefinedProperties );
}
 
void QgsPointCloudRendererPropertiesWidget::rendererChanged()
{
  if ( cboRenderers->currentIndex() == -1 )
  {
    QgsDebugError( u"No current item -- this should never happen!"_s );
    return;
  }
 
  const QString rendererName = cboRenderers->currentData().toString();
 
  //Retrieve the previous renderer: from the old active widget if possible, otherwise from the layer
  std::unique_ptr<QgsPointCloudRenderer> oldRenderer;
  std::unique_ptr<QgsPointCloudRenderer> newRenderer;
  if ( mActiveWidget )
    newRenderer.reset( mActiveWidget->renderer() );
 
  if ( newRenderer )
  {
    oldRenderer = std::move( newRenderer );
  }
  else
  {
    oldRenderer.reset( mLayer->renderer()->clone() );
  }
 
  // get rid of old active widget (if any)
  if ( mActiveWidget )
  {
    stackedWidget->removeWidget( mActiveWidget );
 
    delete mActiveWidget;
    mActiveWidget = nullptr;
  }
 
  QgsPointCloudRendererWidget *widget = nullptr;
  QgsPointCloudRendererAbstractMetadata *rendererMetadata = QgsApplication::pointCloudRendererRegistry()->rendererMetadata( rendererName );
  if ( rendererMetadata )
    widget = rendererMetadata->createRendererWidget( mLayer, mStyle, oldRenderer.get() );
  oldRenderer.reset();
 
  if ( widget )
  {
    // instantiate the widget and set as active
    mActiveWidget = widget;
    stackedWidget->addWidget( mActiveWidget );
    stackedWidget->setCurrentWidget( mActiveWidget );
 
    if ( mMapCanvas || mMessageBar )
    {
      QgsSymbolWidgetContext context;
      context.setMapCanvas( mMapCanvas );
      context.setMessageBar( mMessageBar );
      mActiveWidget->setContext( mContext );
    }
 
    connect( mActiveWidget, &QgsPanelWidget::widgetChanged, this, &QgsPointCloudRendererPropertiesWidget::widgetChanged );
    connect( mActiveWidget, &QgsPanelWidget::showPanel, this, &QgsPointCloudRendererPropertiesWidget::openPanel );
    widget->setDockMode( dockMode() );
  }
  else
  {
    // set default "no edit widget available" page
    stackedWidget->setCurrentWidget( pageNoWidget );
  }
  emitWidgetChanged();
}
 
void QgsPointCloudRendererPropertiesWidget::emitWidgetChanged()
{
  if ( !mBlockChangedSignal )
    emit widgetChanged();
}
 
void QgsPointCloudRendererPropertiesWidget::updateDataDefinedProperty()
{
  const QString expression = mColorExpressionWidget->expression();
  if ( !expression.isEmpty() )
    mDataDefinedProperties.setProperty( QgsPointCloudRenderer::Property::Color, QgsProperty::fromExpression( expression ) );
  else
    mDataDefinedProperties.setProperty( QgsPointCloudRenderer::Property::Color, QgsProperty() );
  emitWidgetChanged();
}
 
 
void QgsPointCloudRendererPropertiesWidget::setOverviewSwitchingScale( double scale )
{
  mOverviewSwitchingScale->setCurrentIndex( mOverviewSwitchingScale->findData( scale ) );
}
 
double QgsPointCloudRendererPropertiesWidget::overviewSwitchingScale() const
{
  return mOverviewSwitchingScaleMap.key( mOverviewSwitchingScale->currentText() );
}
 
QgsExpressionContext QgsPointCloudRendererPropertiesWidget::createExpressionContext() const
{
  if ( auto *lExpressionContext = mContext.expressionContext() )
    return *lExpressionContext;
 
  QgsExpressionContext context( mContext.globalProjectAtlasMapLayerScopes( mLayer ) );
 
  auto pointCloudScope = std::make_unique<QgsExpressionContextScope>( tr( "Point Cloud" ) );
  context.appendScope( pointCloudScope.release() );
 
  for ( const QgsExpressionContextScope &scope : mContext.additionalExpressionContextScopes() )
    context.appendScope( new QgsExpressionContextScope( scope ) );
 
  context.setHighlightedVariables( QStringList() << QgsExpressionContext::EXPR_ORIGINAL_VALUE );
 
  return context;
}