qgsrasterlayerproperties.cpp

Go to the documentation of this file.

/***************************************************************************
  qgsrasterlayerproperties.cpp  -  description
  -------------------
      begin                : 1/1/2004
      copyright            : (C) 2004 Tim Sutton
      email                : [email protected]
 ***************************************************************************/
 
/***************************************************************************
 *                                                                         *
 *   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 <limits>
#include <typeinfo>
 
#include "qgsgui.h"
#include "qgsapplication.h"
#include "qgsbrightnesscontrastfilter.h"
#include "qgscreaterasterattributetabledialog.h"
#include "qgslogger.h"
#include "qgsloadrasterattributetabledialog.h"
#include "qgsmapcanvas.h"
#include "qgsmaplayerstyleguiutils.h"
#include "qgsmaptoolemitpoint.h"
#include "qgsmetadatawidget.h"
#include "qgsmetadataurlitemdelegate.h"
#include "qgsmultibandcolorrenderer.h"
#include "qgsmultibandcolorrendererwidget.h"
#include "qgsnative.h"
#include "qgspalettedrendererwidget.h"
#include "qgsprovidersourcewidgetproviderregistry.h"
#include "qgsprovidersourcewidget.h"
#include "qgsproject.h"
#include "qgsrastercontourrendererwidget.h"
#include "qgsrasterdataprovider.h"
#include "qgsrasterhistogramwidget.h"
#include "qgsrastertransparencywidget.h"
#include "qgsrasterlayer.h"
#include "qgsrasterlayerproperties.h"
#include "qgsrasterpyramid.h"
#include "qgsrasterrange.h"
#include "qgsrasterrenderer.h"
#include "qgsrasterrendererregistry.h"
#include "qgsrastertransparency.h"
#include "qgssinglebandgrayrendererwidget.h"
#include "qgssinglebandpseudocolorrendererwidget.h"
#include "qgshuesaturationfilter.h"
#include "qgshillshaderendererwidget.h"
#include "qgssettings.h"
#include "qgsdatumtransformdialog.h"
#include "qgsmaplayerlegend.h"
#include "qgsfileutils.h"
#include "qgswebview.h"
#include "qgsvectorlayer.h"
#include "qgsdoublevalidator.h"
#include "qgsmaplayerconfigwidgetfactory.h"
#include "qgsprojectutils.h"
#include "qgsrasterattributetablewidget.h"
#include "qgsrasterlayertemporalpropertieswidget.h"
#include "qgsexpressioncontextutils.h"
#include "qgsmaptip.h"
#include "qgswebframe.h"
#if WITH_QTWEBKIT
#include <QWebElement>
#endif
 
#include <QDesktopServices>
#include <QTableWidgetItem>
#include <QHeaderView>
#include <QTextStream>
#include <QFile>
#include <QFileDialog>
#include <QMessageBox>
#include <QPainter>
#include <QLinearGradient>
#include <QPainterPath>
#include <QPolygonF>
#include <QColorDialog>
#include <QList>
#include <QMouseEvent>
#include <QVector>
#include <QUrl>
#include <QMenu>
#include <QScreen>
#include <QRegularExpressionValidator>
#include <QRegularExpression>
 
QgsRasterLayerProperties::QgsRasterLayerProperties( QgsMapLayer *lyr, QgsMapCanvas *canvas, QWidget *parent, Qt::WindowFlags fl )
  : QgsOptionsDialogBase( QStringLiteral( "RasterLayerProperties" ), parent, fl )
    // Constant that signals property not used.
  , TRSTRING_NOT_SET( tr( "Not Set" ) )
  , mDefaultStandardDeviation( 0 )
  , mDefaultRedBand( 0 )
  , mDefaultGreenBand( 0 )
  , mDefaultBlueBand( 0 )
  , mRasterLayer( qobject_cast<QgsRasterLayer *>( lyr ) )
  , mGradientHeight( 0.0 )
  , mGradientWidth( 0.0 )
  , mMapCanvas( canvas )
  , mMetadataFilled( false )
{
  mGrayMinimumMaximumEstimated = true;
  mRGBMinimumMaximumEstimated = true;
 
  setupUi( this );
 
  mMetadataViewer = new QgsWebView( this );
  mOptsPage_Information->layout()->addWidget( mMetadataViewer );
 
  mRasterTransparencyWidget = new QgsRasterTransparencyWidget( mRasterLayer, canvas, this );
 
  transparencyScrollArea->setWidget( mRasterTransparencyWidget );
 
  connect( buttonBuildPyramids, &QPushButton::clicked, this, &QgsRasterLayerProperties::buttonBuildPyramids_clicked );
  connect( mCrsSelector, &QgsProjectionSelectionWidget::crsChanged, this, &QgsRasterLayerProperties::mCrsSelector_crsChanged );
  connect( mRenderTypeComboBox, static_cast<void ( QComboBox::* )( int )>( &QComboBox::currentIndexChanged ), this, &QgsRasterLayerProperties::mRenderTypeComboBox_currentIndexChanged );
  connect( mResetColorRenderingBtn, &QToolButton::clicked, this, &QgsRasterLayerProperties::mResetColorRenderingBtn_clicked );
  connect( buttonRemoveMetadataUrl, &QPushButton::clicked, this, &QgsRasterLayerProperties::removeSelectedMetadataUrl );
  connect( buttonAddMetadataUrl, &QPushButton::clicked, this, &QgsRasterLayerProperties::addMetadataUrl );
  // QgsOptionsDialogBase handles saving/restoring of geometry, splitter and current tab states,
  // switching vertical tabs between icon/text to icon-only modes (splitter collapsed to left),
  // and connecting QDialogButtonBox's accepted/rejected signals to dialog's accept/reject slots
  initOptionsBase( false );
  connect( buttonBox, &QDialogButtonBox::helpRequested, this, &QgsRasterLayerProperties::showHelp );
 
  mSourceGroupBox->hide();
 
  mBtnStyle = new QPushButton( tr( "Style" ) );
  QMenu *menuStyle = new QMenu( this );
  menuStyle->addAction( tr( "Load Style…" ), this, &QgsRasterLayerProperties::loadStyle );
  menuStyle->addAction( tr( "Save Style…" ), this, &QgsRasterLayerProperties::saveStyleAs );
  menuStyle->addSeparator();
  menuStyle->addAction( tr( "Save as Default" ), this, &QgsRasterLayerProperties::saveDefaultStyle );
  menuStyle->addAction( tr( "Restore Default" ), this, &QgsRasterLayerProperties::loadDefaultStyle );
  mBtnStyle->setMenu( menuStyle );
  connect( menuStyle, &QMenu::aboutToShow, this, &QgsRasterLayerProperties::aboutToShowStyleMenu );
  buttonBox->addButton( mBtnStyle, QDialogButtonBox::ResetRole );
 
  mBtnMetadata = new QPushButton( tr( "Metadata" ), this );
  QMenu *menuMetadata = new QMenu( this );
  mActionLoadMetadata = menuMetadata->addAction( tr( "Load Metadata…" ), this, &QgsRasterLayerProperties::loadMetadata );
  mActionSaveMetadataAs = menuMetadata->addAction( tr( "Save Metadata…" ), this, &QgsRasterLayerProperties::saveMetadataAs );
  menuMetadata->addSeparator();
  menuMetadata->addAction( tr( "Save as Default" ), this, &QgsRasterLayerProperties::saveDefaultMetadata );
  menuMetadata->addAction( tr( "Restore Default" ), this, &QgsRasterLayerProperties::loadDefaultMetadata );
  mBtnMetadata->setMenu( menuMetadata );
  buttonBox->addButton( mBtnMetadata, QDialogButtonBox::ResetRole );
 
  connect( lyr->styleManager(), &QgsMapLayerStyleManager::currentStyleChanged, this, &QgsRasterLayerProperties::syncToLayer );
 
  connect( this, &QDialog::accepted, this, &QgsRasterLayerProperties::apply );
  connect( this, &QDialog::rejected, this, &QgsRasterLayerProperties::onCancel );
 
  connect( buttonBox->button( QDialogButtonBox::Apply ), &QAbstractButton::clicked, this, &QgsRasterLayerProperties::apply );
 
  cbxPyramidsFormat->addItem( tr( "External" ), QVariant::fromValue( Qgis::RasterPyramidFormat::GeoTiff ) );
  cbxPyramidsFormat->addItem( tr( "Internal (if possible)" ), QVariant::fromValue( Qgis::RasterPyramidFormat::Internal ) );
  cbxPyramidsFormat->addItem( tr( "External (Erdas Imagine)" ), QVariant::fromValue( Qgis::RasterPyramidFormat::Erdas ) );
 
  // brightness/contrast controls
  connect( mSliderBrightness, &QAbstractSlider::valueChanged, mBrightnessSpinBox, &QSpinBox::setValue );
  connect( mBrightnessSpinBox, static_cast < void ( QSpinBox::* )( int ) > ( &QSpinBox::valueChanged ), mSliderBrightness, &QAbstractSlider::setValue );
  mBrightnessSpinBox->setClearValue( 0 );
 
  connect( mSliderContrast, &QAbstractSlider::valueChanged, mContrastSpinBox, &QSpinBox::setValue );
  connect( mContrastSpinBox, static_cast < void ( QSpinBox::* )( int ) > ( &QSpinBox::valueChanged ), mSliderContrast, &QAbstractSlider::setValue );
  mContrastSpinBox->setClearValue( 0 );
 
  // gamma correction controls
  connect( mSliderGamma, &QAbstractSlider::valueChanged, this, &QgsRasterLayerProperties::updateGammaSpinBox );
  connect( mGammaSpinBox, static_cast < void ( QDoubleSpinBox::* )( double ) > ( &QDoubleSpinBox::valueChanged ), this, &QgsRasterLayerProperties::updateGammaSlider );
  mGammaSpinBox->setClearValue( 1.0 );
 
  // Connect saturation slider and spin box
  connect( sliderSaturation, &QAbstractSlider::valueChanged, spinBoxSaturation, &QSpinBox::setValue );
  connect( spinBoxSaturation, static_cast < void ( QSpinBox::* )( int ) > ( &QSpinBox::valueChanged ), sliderSaturation, &QAbstractSlider::setValue );
  spinBoxSaturation->setClearValue( 0 );
 
  // Connect colorize strength slider and spin box
  connect( sliderColorizeStrength, &QAbstractSlider::valueChanged, spinColorizeStrength, &QSpinBox::setValue );
  connect( spinColorizeStrength, static_cast < void ( QSpinBox::* )( int ) > ( &QSpinBox::valueChanged ), sliderColorizeStrength, &QAbstractSlider::setValue );
  spinColorizeStrength->setClearValue( 100 );
 
  // enable or disable saturation slider and spin box depending on grayscale combo choice
  connect( comboGrayscale, static_cast<void ( QComboBox::* )( int )>( &QComboBox::currentIndexChanged ), this, &QgsRasterLayerProperties::toggleSaturationControls );
 
  // enable or disable colorize colorbutton with colorize checkbox
  connect( mColorizeCheck, &QAbstractButton::toggled, this, &QgsRasterLayerProperties::toggleColorizeControls );
 
  // enable or disable Build Pyramids button depending on selection in pyramid list
  connect( lbxPyramidResolutions, &QListWidget::itemSelectionChanged, this, &QgsRasterLayerProperties::toggleBuildPyramidsButton );
 
  connect( mRefreshLayerCheckBox, &QCheckBox::toggled, mRefreshLayerIntervalSpinBox, &QDoubleSpinBox::setEnabled );
 
  // set up the scale based layer visibility stuff....
  mScaleRangeWidget->setMapCanvas( mMapCanvas );
  chkUseScaleDependentRendering->setChecked( lyr->hasScaleBasedVisibility() );
  mScaleRangeWidget->setScaleRange( lyr->minimumScale(), lyr->maximumScale() );
 
  // Setup the layer metadata URL
  tableViewMetadataUrl->setSelectionMode( QAbstractItemView::SingleSelection );
  tableViewMetadataUrl->setSelectionBehavior( QAbstractItemView::SelectRows );
  tableViewMetadataUrl->horizontalHeader()->setStretchLastSection( true );
  tableViewMetadataUrl->horizontalHeader()->setSectionResizeMode( QHeaderView::Stretch );
 
  mMetadataUrlModel = new QStandardItemModel( tableViewMetadataUrl );
  mMetadataUrlModel->clear();
  mMetadataUrlModel->setColumnCount( 3 );
  QStringList metadataUrlHeaders;
  metadataUrlHeaders << tr( "URL" ) << tr( "Type" ) << tr( "Format" );
  mMetadataUrlModel->setHorizontalHeaderLabels( metadataUrlHeaders );
  tableViewMetadataUrl->setModel( mMetadataUrlModel );
  tableViewMetadataUrl->setItemDelegate( new MetadataUrlItemDelegate( this ) );
 
  // build GUI components
  QIcon myPyramidPixmap( QgsApplication::getThemeIcon( "/mIconPyramid.svg" ) );
  QIcon myNoPyramidPixmap( QgsApplication::getThemeIcon( "/mIconNoPyramid.svg" ) );
 
  mRasterTransparencyWidget->pbnAddValuesManually->setIcon( QgsApplication::getThemeIcon( QStringLiteral( "/symbologyAdd.svg" ) ) );
  mRasterTransparencyWidget->pbnAddValuesFromDisplay->setIcon( QgsApplication::getThemeIcon( QStringLiteral( "/mActionContextHelp.png" ) ) );
  mRasterTransparencyWidget->pbnRemoveSelectedRow->setIcon( QgsApplication::getThemeIcon( QStringLiteral( "/symbologyRemove.svg" ) ) );
  mRasterTransparencyWidget->pbnDefaultValues->setIcon( QgsApplication::getThemeIcon( QStringLiteral( "/mActionOpenTable.svg" ) ) );
  mRasterTransparencyWidget->pbnImportTransparentPixelValues->setIcon( QgsApplication::getThemeIcon( QStringLiteral( "/mActionFileOpen.svg" ) ) );
  mRasterTransparencyWidget->pbnExportTransparentPixelValues->setIcon( QgsApplication::getThemeIcon( QStringLiteral( "/mActionFileSave.svg" ) ) );
  initMapTipPreview();
 
  if ( !mRasterLayer )
  {
    return;
  }
 
  connect( mEnableMapTips, &QAbstractButton::toggled, mHtmlMapTipGroupBox, &QWidget::setEnabled );
  mEnableMapTips->setChecked( mRasterLayer->mapTipsEnabled() );
 
  updateRasterAttributeTableOptionsPage();
 
  connect( mRasterLayer, &QgsRasterLayer::rendererChanged, this, &QgsRasterLayerProperties::updateRasterAttributeTableOptionsPage );
 
  connect( mCreateRasterAttributeTableButton, &QPushButton::clicked, this, [ = ]
  {
    if ( mRasterLayer->canCreateRasterAttributeTable() )
    {
      // Create the attribute table from the renderer
      QgsCreateRasterAttributeTableDialog dlg { mRasterLayer };
      dlg.setOpenWhenDoneVisible( false );
      if ( dlg.exec() == QDialog::Accepted )
      {
        updateRasterAttributeTableOptionsPage();
      }
    }
  } );
 
  connect( mLoadRasterAttributeTableFromFileButton, &QPushButton::clicked, this, [ = ]
  {
    // Load the attribute table from a VAT.DBF file
    QgsLoadRasterAttributeTableDialog dlg { mRasterLayer };
    dlg.setOpenWhenDoneVisible( false );
    if ( dlg.exec() == QDialog::Accepted )
    {
      updateRasterAttributeTableOptionsPage();
    }
  } );
 
  mBackupCrs = mRasterLayer->crs();
 
  // Handles window modality raising canvas
  if ( mMapCanvas && mRasterTransparencyWidget->pixelSelectorTool() )
  {
 
    connect( mRasterTransparencyWidget->pixelSelectorTool(), &QgsMapToolEmitPoint::deactivated, this, [ = ]
    {
      hide();
      setModal( true );
      show();
      raise();
      activateWindow();
    } );
 
    connect( mRasterTransparencyWidget->pbnAddValuesFromDisplay, &QPushButton::clicked, this, [ = ]
    {
      hide();
      setModal( false );
 
      // Transfer focus to the canvas to use the selector tool
      mMapCanvas->window()->raise();
      mMapCanvas->window()->activateWindow();
      mMapCanvas->window()->setFocus();
    } );
  }
 
  mContext << QgsExpressionContextUtils::globalScope()
           << QgsExpressionContextUtils::projectScope( QgsProject::instance() )
           << QgsExpressionContextUtils::atlasScope( nullptr );
 
  if ( mMapCanvas )
  {
    mContext << QgsExpressionContextUtils::mapSettingsScope( mMapCanvas->mapSettings() );
    // Initialize with layer center
    mContext << QgsExpressionContextUtils::mapLayerPositionScope( mRasterLayer->extent().center() );
  }
 
  mContext << QgsExpressionContextUtils::layerScope( mRasterLayer );
 
  mMapTipExpressionWidget->registerExpressionContextGenerator( this );
 
  connect( mInsertExpressionButton, &QAbstractButton::clicked, this, [ = ]
  {
    QString expression = QStringLiteral( "[% " );
    expression += mMapTipExpressionWidget->expression();
    expression += QLatin1String( " %]" );
    mMapTipWidget->insertText( expression );
  } );
 
  QgsRasterDataProvider *provider = mRasterLayer->dataProvider();
 
  // Only do pyramids if dealing directly with GDAL.
  if ( provider && provider->capabilities() & QgsRasterDataProvider::BuildPyramids )
  {
    // initialize resampling methods
    cboResamplingMethod->clear();
 
    const auto constProviderType = QgsRasterDataProvider::pyramidResamplingMethods( mRasterLayer->providerType() );
    for ( const QPair<QString, QString> &method : std::as_const( constProviderType ) )
    {
      cboResamplingMethod->addItem( method.second, method.first );
    }
 
    // keep it in sync with qgsrasterpyramidsoptionwidget.cpp
    QString prefix = provider->name() + "/driverOptions/_pyramids/";
    QgsSettings mySettings;
    QString defaultMethod = mySettings.value( prefix + "resampling", "AVERAGE" ).toString();
    int idx = cboResamplingMethod->findData( defaultMethod );
    if ( idx >= 0 )
      cboResamplingMethod->setCurrentIndex( idx );
 
 
    // build pyramid list
    const QList< QgsRasterPyramid > myPyramidList = provider->buildPyramidList();
 
    for ( const QgsRasterPyramid &pyramid : myPyramidList )
    {
      if ( pyramid.getExists() )
      {
        lbxPyramidResolutions->addItem( new QListWidgetItem( myPyramidPixmap,
                                        QString::number( pyramid.getXDim() ) + QStringLiteral( " x " ) +
                                        QString::number( pyramid.getYDim() ) ) );
      }
      else
      {
        lbxPyramidResolutions->addItem( new QListWidgetItem( myNoPyramidPixmap,
                                        QString::number( pyramid.getXDim() ) + QStringLiteral( " x " ) +
                                        QString::number( pyramid.getYDim() ) ) );
      }
    }
  }
  else
  {
    // disable Pyramids tab completely
    mOptsPage_Pyramids->setEnabled( false );
  }
 
  // We can calculate histogram for all data sources but estimated only if
  // size is unknown - could also be enabled if well supported (estimated histogram
  // and let user know that it is estimated)
  if ( !provider || !( provider->capabilities() & QgsRasterDataProvider::Size ) )
  {
    // disable Histogram tab completely
    mOptsPage_Histogram->setEnabled( false );
  }
 
  QVBoxLayout *layout = new QVBoxLayout( metadataFrame );
  layout->setContentsMargins( 0, 0, 0, 0 );
  mMetadataWidget = new QgsMetadataWidget( this, mRasterLayer );
  mMetadataWidget->layout()->setContentsMargins( 0, 0, 0, 0 );
  mMetadataWidget->setMapCanvas( mMapCanvas );
  layout->addWidget( mMetadataWidget );
  metadataFrame->setLayout( layout );
 
  QVBoxLayout *temporalLayout = new QVBoxLayout( temporalFrame );
  temporalLayout->setContentsMargins( 0, 0, 0, 0 );
  mTemporalWidget = new QgsRasterLayerTemporalPropertiesWidget( this, mRasterLayer );
  temporalLayout->addWidget( mTemporalWidget );
 
  QgsDebugMsgLevel( "Setting crs to " + mRasterLayer->crs().toWkt( QgsCoordinateReferenceSystem::WKT_PREFERRED ), 2 );
  QgsDebugMsgLevel( "Setting crs to " + mRasterLayer->crs().userFriendlyIdentifier(), 2 );
  mCrsSelector->setCrs( mRasterLayer->crs() );
 
  // Set text for pyramid info box
  QString pyramidFormat( QStringLiteral( "<h2>%1</h2><p>%2 %3 %4</p><b><font color='red'><p>%5</p><p>%6</p>" ) );
  QString pyramidHeader    = tr( "Description" );
  QString pyramidSentence1 = tr( "Large resolution raster layers can slow navigation in QGIS." );
  QString pyramidSentence2 = tr( "By creating lower resolution copies of the data (pyramids) performance can be considerably improved as QGIS selects the most suitable resolution to use depending on the level of zoom." );
  QString pyramidSentence3 = tr( "You must have write access in the directory where the original data is stored to build pyramids." );
  QString pyramidSentence4 = tr( "Please note that building internal pyramids may alter the original data file and once created they cannot be removed!" );
  QString pyramidSentence5 = tr( "Please note that building internal pyramids could corrupt your image - always make a backup of your data first!" );
 
  tePyramidDescription->setHtml( pyramidFormat.arg( pyramidHeader,
                                 pyramidSentence1,
                                 pyramidSentence2,
                                 pyramidSentence3,
                                 pyramidSentence4,
                                 pyramidSentence5 ) );
 
  //resampling
  mResamplingGroupBox->setSaveCheckedState( true );
  mResamplingUtils.initWidgets( mRasterLayer, mZoomedInResamplingComboBox, mZoomedOutResamplingComboBox, mMaximumOversamplingSpinBox, mCbEarlyResampling );
  mResamplingUtils.refreshWidgetsFromLayer();
 
  const QgsRasterRenderer *renderer = mRasterLayer->renderer();
 
  btnColorizeColor->setColorDialogTitle( tr( "Select Color" ) );
  btnColorizeColor->setContext( QStringLiteral( "symbology" ) );
 
  // Hue and saturation color control
  const QgsHueSaturationFilter *hueSaturationFilter = mRasterLayer->hueSaturationFilter();
  //set hue and saturation controls to current values
  if ( hueSaturationFilter )
  {
    sliderSaturation->setValue( hueSaturationFilter->saturation() );
    comboGrayscale->setCurrentIndex( ( int ) hueSaturationFilter->grayscaleMode() );
 
    // Set initial state of saturation controls based on grayscale mode choice
    toggleSaturationControls( static_cast<int>( hueSaturationFilter->grayscaleMode() ) );
 
    // Set initial state of colorize controls
    mColorizeCheck->setChecked( hueSaturationFilter->colorizeOn() );
    btnColorizeColor->setColor( hueSaturationFilter->colorizeColor() );
    toggleColorizeControls( hueSaturationFilter->colorizeOn() );
    sliderColorizeStrength->setValue( hueSaturationFilter->colorizeStrength() );
    mInvertColorsCheck->setChecked( hueSaturationFilter->invertColors() );
  }
 
  //blend mode
  mBlendModeComboBox->setShowClippingModes( QgsProjectUtils::layerIsContainedInGroupLayer( QgsProject::instance(), mRasterLayer ) );
  mBlendModeComboBox->setBlendMode( mRasterLayer->blendMode() );
 
  //transparency band
  if ( provider )
  {
    mRasterTransparencyWidget->cboxTransparencyBand->setShowNotSetOption( true, tr( "None" ) );
    mRasterTransparencyWidget->cboxTransparencyBand->setLayer( mRasterLayer );
 
// Alpha band is set in sync()
#if 0
    if ( renderer )
    {
      QgsDebugMsgLevel( QStringLiteral( "alphaBand = %1" ).arg( renderer->alphaBand() ), 2 );
      if ( renderer->alphaBand() > 0 )
      {
        cboxTransparencyBand->setCurrentIndex( cboxTransparencyBand->findData( renderer->alphaBand() ) );
      }
    }
#endif
  }
 
  // create histogram widget
  mHistogramWidget = nullptr;
  if ( mOptsPage_Histogram->isEnabled() )
  {
    mHistogramWidget = new QgsRasterHistogramWidget( mRasterLayer, mOptsPage_Histogram );
    mHistogramStackedWidget->addWidget( mHistogramWidget );
  }
 
  //insert renderer widgets into registry
  QgsApplication::rasterRendererRegistry()->insertWidgetFunction( QStringLiteral( "paletted" ), QgsPalettedRendererWidget::create );
  QgsApplication::rasterRendererRegistry()->insertWidgetFunction( QStringLiteral( "multibandcolor" ), QgsMultiBandColorRendererWidget::create );
  QgsApplication::rasterRendererRegistry()->insertWidgetFunction( QStringLiteral( "singlebandpseudocolor" ), QgsSingleBandPseudoColorRendererWidget::create );
  QgsApplication::rasterRendererRegistry()->insertWidgetFunction( QStringLiteral( "singlebandgray" ), QgsSingleBandGrayRendererWidget::create );
  QgsApplication::rasterRendererRegistry()->insertWidgetFunction( QStringLiteral( "hillshade" ), QgsHillshadeRendererWidget::create );
  QgsApplication::rasterRendererRegistry()->insertWidgetFunction( QStringLiteral( "contour" ), QgsRasterContourRendererWidget::create );
 
  //fill available renderers into combo box
  QgsRasterRendererRegistryEntry entry;
  mDisableRenderTypeComboBoxCurrentIndexChanged = true;
  const auto constRenderersList = QgsApplication::rasterRendererRegistry()->renderersList();
  for ( const QString &name : constRenderersList )
  {
    if ( QgsApplication::rasterRendererRegistry()->rendererData( name, entry ) )
    {
      if ( ( mRasterLayer->rasterType() != Qgis::RasterLayerType::SingleBandColorData && entry.name != QLatin1String( "singlebandcolordata" ) ) ||
           ( mRasterLayer->rasterType() == Qgis::RasterLayerType::SingleBandColorData && entry.name == QLatin1String( "singlebandcolordata" ) ) )
      {
        mRenderTypeComboBox->addItem( entry.visibleName, entry.name );
      }
    }
  }
  mDisableRenderTypeComboBoxCurrentIndexChanged = false;
 
  int widgetIndex = 0;
  if ( renderer )
  {
    QString rendererType = renderer->type();
    widgetIndex = mRenderTypeComboBox->findData( rendererType );
    if ( widgetIndex != -1 )
    {
      mDisableRenderTypeComboBoxCurrentIndexChanged = true;
      mRenderTypeComboBox->setCurrentIndex( widgetIndex );
      mDisableRenderTypeComboBoxCurrentIndexChanged = false;
    }
 
    if ( rendererType == QLatin1String( "singlebandcolordata" ) && mRenderTypeComboBox->count() == 1 )
    {
      // no band rendering options for singlebandcolordata, so minimize group box
      QSizePolicy sizep = mBandRenderingGrpBx->sizePolicy();
      sizep.setVerticalStretch( 0 );
      sizep.setVerticalPolicy( QSizePolicy::Maximum );
      mBandRenderingGrpBx->setSizePolicy( sizep );
      mBandRenderingGrpBx->updateGeometry();
    }
 
    if ( mRasterLayer->providerType() != QLatin1String( "wms" ) )
    {
      mWMSPrintGroupBox->hide();
      mPublishDataSourceUrlCheckBox->hide();
      mBackgroundLayerCheckBox->hide();
    }
  }
 
#ifdef WITH_QTWEBKIT
  // Setup information tab
 
  const int horizontalDpi = logicalDpiX();
 
  // Adjust zoom: text is ok, but HTML seems rather big at least on Linux/KDE
  if ( horizontalDpi > 96 )
  {
    mMetadataViewer->setZoomFactor( mMetadataViewer->zoomFactor() * 0.9 );
  }
  mMetadataViewer->page()->setLinkDelegationPolicy( QWebPage::LinkDelegationPolicy::DelegateAllLinks );
  connect( mMetadataViewer->page(), &QWebPage::linkClicked, this, &QgsRasterLayerProperties::urlClicked );
  mMetadataViewer->page()->settings()->setAttribute( QWebSettings::DeveloperExtrasEnabled, true );
  mMetadataViewer->page()->settings()->setAttribute( QWebSettings::JavascriptEnabled, true );
 
#endif
 
  initializeDataDefinedButton( mRasterTransparencyWidget->mOpacityDDBtn, QgsRasterPipe::RendererOpacity );
 
  mRenderTypeComboBox_currentIndexChanged( widgetIndex );
 
  // update based on lyr's current state
  sync();
 
  QgsSettings settings;
  // if dialog hasn't been opened/closed yet, default to Styles tab, which is used most often
  // this will be read by restoreOptionsBaseUi()
  if ( !settings.contains( QStringLiteral( "/Windows/RasterLayerProperties/tab" ) ) )
  {
    settings.setValue( QStringLiteral( "Windows/RasterLayerProperties/tab" ),
                       mOptStackedWidget->indexOf( mOptsPage_Style ) );
  }
 
  mResetColorRenderingBtn->setIcon( QgsApplication::getThemeIcon( QStringLiteral( "/mActionUndo.svg" ) ) );
 
  QString title = tr( "Layer Properties — %1" ).arg( lyr->name() );
 
  if ( !mRasterLayer->styleManager()->isDefault( mRasterLayer->styleManager()->currentStyle() ) )
    title += QStringLiteral( " (%1)" ).arg( mRasterLayer->styleManager()->currentStyle() );
  restoreOptionsBaseUi( title );
  optionsStackedWidget_CurrentChanged( mOptionsStackedWidget->currentIndex() );
 
  //Add help page references
  mOptsPage_Information->setProperty( "helpPage", QStringLiteral( "working_with_raster/raster_properties.html#information-properties" ) );
  mOptsPage_Source->setProperty( "helpPage", QStringLiteral( "working_with_raster/raster_properties.html#source-properties" ) );
  mOptsPage_Style->setProperty( "helpPage", QStringLiteral( "working_with_raster/raster_properties.html#symbology-properties" ) );
  mOptsPage_Transparency->setProperty( "helpPage", QStringLiteral( "working_with_raster/raster_properties.html#transparency-properties" ) );
 
  if ( mOptsPage_Histogram )
    mOptsPage_Histogram->setProperty( "helpPage", QStringLiteral( "working_with_raster/raster_properties.html#histogram-properties" ) );
 
  mOptsPage_Rendering->setProperty( "helpPage", QStringLiteral( "working_with_raster/raster_properties.html#rendering-properties" ) );
  mOptsPage_Temporal->setProperty( "helpPage", QStringLiteral( "working_with_raster/raster_properties.html#temporal-properties" ) );
 
  if ( mOptsPage_Pyramids )
    mOptsPage_Pyramids->setProperty( "helpPage", QStringLiteral( "working_with_raster/raster_properties.html#pyramids-properties" ) );
 
  if ( mOptsPage_Display )
    mOptsPage_Display->setProperty( "helpPage", QStringLiteral( "working_with_raster/raster_properties.html#display-properties" ) );
 
  mOptsPage_Metadata->setProperty( "helpPage", QStringLiteral( "working_with_raster/raster_properties.html#metadata-properties" ) );
  mOptsPage_Legend->setProperty( "helpPage", QStringLiteral( "working_with_raster/raster_properties.html#legend-properties" ) );
  mOptsPage_Server->setProperty( "helpPage", QStringLiteral( "working_with_raster/raster_properties.html#server-properties" ) );
}
 
void QgsRasterLayerProperties::addPropertiesPageFactory( const QgsMapLayerConfigWidgetFactory *factory )
{
  if ( !factory->supportsLayer( mRasterLayer ) || !factory->supportLayerPropertiesDialog() )
  {
    return;
  }
 
  QgsMapLayerConfigWidget *page = factory->createWidget( mRasterLayer, nullptr, false, this );
  switch ( factory->parentPage() )
  {
    case QgsMapLayerConfigWidgetFactory::ParentPage::NoParent:
    {
      mLayerPropertiesPages << page;
 
      const QString beforePage = factory->layerPropertiesPagePositionHint();
      if ( beforePage.isEmpty() )
        addPage( factory->title(), factory->title(), factory->icon(), page );
      else
        insertPage( factory->title(), factory->title(), factory->icon(), page, beforePage );
      break;
    }
 
    case QgsMapLayerConfigWidgetFactory::ParentPage::Temporal:
      mTemporalWidget->addWidget( page );
      break;
  }
}
 
QgsExpressionContext QgsRasterLayerProperties::createExpressionContext() const
{
  return mContext;
}
 
void QgsRasterLayerProperties::updateRasterAttributeTableOptionsPage( )
{
  if ( mRasterAttributeTableWidget )
  {
    mOptsPage_RasterAttributeTable->layout()->removeWidget( mRasterAttributeTableWidget );
    mRasterAttributeTableWidget = nullptr;
  }
 
  // Setup raster attribute table
  if ( mRasterLayer->attributeTableCount() > 0 )
  {
    mRasterAttributeTableWidget = new QgsRasterAttributeTableWidget( this, mRasterLayer );
    mOptsPage_RasterAttributeTable->layout()->addWidget( mRasterAttributeTableWidget );
    // When the renderer changes we need to sync the style options page
    connect( mRasterAttributeTableWidget, &QgsRasterAttributeTableWidget::rendererChanged, this, &QgsRasterLayerProperties::syncToLayer );
    mNoRasterAttributeTableWidget->hide();
  }
  else
  {
    mNoRasterAttributeTableWidget->show();
    mCreateRasterAttributeTableButton->setEnabled( mRasterLayer->canCreateRasterAttributeTable() );
  }
}
 
void QgsRasterLayerProperties::setRendererWidget( const QString &rendererName )
{
  QgsDebugMsgLevel( "rendererName = " + rendererName, 3 );
  QgsRasterRendererWidget *oldWidget = mRendererWidget;
  QgsRasterRenderer *oldRenderer = mRasterLayer->renderer();
 
  int alphaBand = -1;
  double opacity = 1;
  QColor nodataColor;
  if ( oldRenderer )
  {
    // Retain alpha band and opacity when switching renderer
    alphaBand = oldRenderer->alphaBand();
    opacity = oldRenderer->opacity();
    nodataColor = oldRenderer->nodataColor();
  }
 
  QgsRasterRendererRegistryEntry rendererEntry;
  if ( QgsApplication::rasterRendererRegistry()->rendererData( rendererName, rendererEntry ) )
  {
    if ( rendererEntry.widgetCreateFunction ) //single band color data renderer e.g. has no widget
    {
      QgsDebugMsgLevel( QStringLiteral( "renderer has widgetCreateFunction" ), 3 );
      // Current canvas extent (used to calc min/max) in layer CRS
      QgsRectangle myExtent = mMapCanvas->mapSettings().outputExtentToLayerExtent( mRasterLayer, mMapCanvas->extent() );
      if ( oldWidget && ( !oldRenderer || rendererName != oldRenderer->type() ) )
      {
        if ( rendererName == QLatin1String( "singlebandgray" ) )
        {
          whileBlocking( mRasterLayer )->setRenderer( QgsApplication::rasterRendererRegistry()->defaultRendererForDrawingStyle( Qgis::RasterDrawingStyle::SingleBandGray, mRasterLayer->dataProvider() ) );
          whileBlocking( mRasterLayer )->setDefaultContrastEnhancement();
        }
        else if ( rendererName == QLatin1String( "multibandcolor" ) )
        {
          whileBlocking( mRasterLayer )->setRenderer( QgsApplication::rasterRendererRegistry()->defaultRendererForDrawingStyle( Qgis::RasterDrawingStyle::MultiBandColor, mRasterLayer->dataProvider() ) );
          whileBlocking( mRasterLayer )->setDefaultContrastEnhancement();
        }
      }
      mRasterLayer->renderer()->setAlphaBand( alphaBand );
      mRasterLayer->renderer()->setOpacity( opacity );
      mRasterLayer->renderer()->setNodataColor( nodataColor );
      mRendererWidget = rendererEntry.widgetCreateFunction( mRasterLayer, myExtent );
      mRendererWidget->setMapCanvas( mMapCanvas );
      mRendererStackedWidget->addWidget( mRendererWidget );
      if ( oldWidget )
      {
        //compare used bands in new and old renderer and reset transparency dialog if different
        std::unique_ptr<QgsRasterRenderer> oldRenderer;
        oldRenderer.reset( oldWidget->renderer() );
        std::unique_ptr<QgsRasterRenderer> newRenderer;
        newRenderer.reset( mRendererWidget->renderer() );
        const QList<int> oldBands = oldRenderer->usesBands();
        const QList<int> newBands = newRenderer->usesBands();
        if ( oldBands != newBands )
        {
          mRasterTransparencyWidget->syncToLayer();
        }
      }
    }
  }
 
  const int widgetIndex = mRenderTypeComboBox->findData( rendererName );
  if ( widgetIndex != -1 )
  {
    mDisableRenderTypeComboBoxCurrentIndexChanged = true;
    mRenderTypeComboBox->setCurrentIndex( widgetIndex );
    mDisableRenderTypeComboBoxCurrentIndexChanged = false;
  }
 
  if ( mRendererWidget != oldWidget )
    delete oldWidget;
 
  if ( mHistogramWidget )
  {
    mHistogramWidget->setRendererWidget( rendererName, mRendererWidget );
  }
}
 
void QgsRasterLayerProperties::sync()
{
  QgsSettings myQSettings;
 
  if ( !mSourceWidget )
  {
    mSourceWidget = QgsGui::sourceWidgetProviderRegistry()->createWidget( mRasterLayer );
    if ( mSourceWidget )
    {
      QHBoxLayout *layout = new QHBoxLayout();
      layout->addWidget( mSourceWidget );
      mSourceGroupBox->setLayout( layout );
      mSourceGroupBox->show();
 
      connect( mSourceWidget, &QgsProviderSourceWidget::validChanged, this, [ = ]( bool isValid )
      {
        buttonBox->button( QDialogButtonBox::Apply )->setEnabled( isValid );
        buttonBox->button( QDialogButtonBox::Ok )->setEnabled( isValid );
      } );
    }
  }
 
  if ( mSourceWidget )
  {
    mSourceWidget->setMapCanvas( mMapCanvas );
    mSourceWidget->setSourceUri( mRasterLayer->source() );
  }
 
  const QgsRasterDataProvider *provider = mRasterLayer->dataProvider();
  if ( !provider )
    return;
 
  if ( provider->dataType( 1 ) == Qgis::DataType::ARGB32
       || provider->dataType( 1 ) == Qgis::DataType::ARGB32_Premultiplied )
  {
    mRasterTransparencyWidget->gboxNoDataValue->setEnabled( false );
    mRasterTransparencyWidget->gboxCustomTransparency->setEnabled( false );
    mOptionsStackedWidget->setCurrentWidget( mOptsPage_Server );
  }
 
  // TODO: Wouldn't it be better to just removeWidget() the tabs than delete them? [LS]
  if ( !( provider->capabilities() & QgsRasterDataProvider::BuildPyramids ) )
  {
    if ( mOptsPage_Pyramids )
    {
      delete mOptsPage_Pyramids;
      mOptsPage_Pyramids = nullptr;
    }
  }
 
  if ( !( provider->capabilities() & QgsRasterDataProvider::Size ) )
  {
    if ( mOptsPage_Histogram )
    {
      delete mOptsPage_Histogram;
      mOptsPage_Histogram = nullptr;
      delete mHistogramWidget;
      mHistogramWidget = nullptr;
    }
  }
 
  QgsDebugMsgLevel( QStringLiteral( "populate transparency tab" ), 3 );
 
  /*
   * Style tab
   */
 
  //set brightness, contrast and gamma
  QgsBrightnessContrastFilter *brightnessFilter = mRasterLayer->brightnessFilter();
  if ( brightnessFilter )
  {
    mSliderBrightness->setValue( brightnessFilter->brightness() );
    mSliderContrast->setValue( brightnessFilter->contrast() );
    mGammaSpinBox->setValue( brightnessFilter->gamma() );
  }
 
  // Hue and saturation color control
  const QgsHueSaturationFilter *hueSaturationFilter = mRasterLayer->hueSaturationFilter();
  //set hue and saturation controls to current values
  if ( hueSaturationFilter )
  {
    sliderSaturation->setValue( hueSaturationFilter->saturation() );
    comboGrayscale->setCurrentIndex( ( int ) hueSaturationFilter->grayscaleMode() );
 
    // Set state of saturation controls based on grayscale mode choice
    toggleSaturationControls( static_cast<int>( hueSaturationFilter->grayscaleMode() ) );
 
    // Set state of colorize controls
    mColorizeCheck->setChecked( hueSaturationFilter->colorizeOn() );
    btnColorizeColor->setColor( hueSaturationFilter->colorizeColor() );
    toggleColorizeControls( hueSaturationFilter->colorizeOn() );
    sliderColorizeStrength->setValue( hueSaturationFilter->colorizeStrength() );
    mInvertColorsCheck->setChecked( hueSaturationFilter->invertColors() );
  }
 
 
  mRefreshLayerCheckBox->setChecked( mRasterLayer->hasAutoRefreshEnabled() );
  mRefreshLayerIntervalSpinBox->setEnabled( mRasterLayer->hasAutoRefreshEnabled() );
  mRefreshLayerIntervalSpinBox->setValue( mRasterLayer->autoRefreshInterval() / 1000.0 );
 
  QgsDebugMsgLevel( QStringLiteral( "populate general tab" ), 3 );
  /*
   * General Tab
   */
 
  mLayerOrigNameLineEd->setText( mRasterLayer->name() );
 
  QgsDebugMsgLevel( QStringLiteral( "populate metadata tab" ), 2 );
  /*
   * Metadata Tab
   */
  //populate the metadata tab's text browser widget with gdal metadata info
  updateInformationContent();
 
  // WMS Name as layer short name
  mLayerShortNameLineEdit->setText( mRasterLayer->shortName() );
  // WMS Name validator
  QValidator *shortNameValidator = new QRegularExpressionValidator( QgsApplication::shortNameRegularExpression(), this );
  mLayerShortNameLineEdit->setValidator( shortNameValidator );
 
  //layer title and abstract
  mLayerTitleLineEdit->setText( mRasterLayer->title() );
  mLayerAbstractTextEdit->setPlainText( mRasterLayer->abstract() );
  mLayerKeywordListLineEdit->setText( mRasterLayer->keywordList() );
  mLayerDataUrlLineEdit->setText( mRasterLayer->dataUrl() );
  mLayerDataUrlFormatComboBox->setCurrentIndex(
    mLayerDataUrlFormatComboBox->findText(
      mRasterLayer->dataUrlFormat()
    )
  );
 
  //layer attribution
  mLayerAttributionLineEdit->setText( mRasterLayer->attribution() );
  mLayerAttributionUrlLineEdit->setText( mRasterLayer->attributionUrl() );
 
  // layer metadata url
  const QList<QgsMapLayerServerProperties::MetadataUrl> &metaUrls = mRasterLayer->serverProperties()->metadataUrls();
  for ( const QgsMapLayerServerProperties::MetadataUrl &metaUrl : metaUrls )
  {
    const int row = mMetadataUrlModel->rowCount();
    mMetadataUrlModel->setItem( row, 0, new QStandardItem( metaUrl.url ) );
    mMetadataUrlModel->setItem( row, 1, new QStandardItem( metaUrl.type ) );
    mMetadataUrlModel->setItem( row, 2, new QStandardItem( metaUrl.format ) );
  }
 
  // layer legend url
  mLayerLegendUrlLineEdit->setText( mRasterLayer->legendUrl() );
  mLayerLegendUrlFormatComboBox->setCurrentIndex( mLayerLegendUrlFormatComboBox->findText( mRasterLayer->legendUrlFormat() ) );
 
  mEnableMapTips->setChecked( mRasterLayer->mapTipsEnabled() );
  mMapTipWidget->setText( mRasterLayer->mapTipTemplate() );
 
  //WMS print layer
  QVariant wmsPrintLayer = mRasterLayer->customProperty( QStringLiteral( "WMSPrintLayer" ) );
  if ( wmsPrintLayer.isValid() )
  {
    mWMSPrintLayerLineEdit->setText( wmsPrintLayer.toString() );
  }
 
  QVariant wmsPublishDataSourceUrl = mRasterLayer->customProperty( QStringLiteral( "WMSPublishDataSourceUrl" ), false );
  mPublishDataSourceUrlCheckBox->setChecked( wmsPublishDataSourceUrl.toBool() );
 
  QVariant wmsBackgroundLayer = mRasterLayer->customProperty( QStringLiteral( "WMSBackgroundLayer" ), false );
  mBackgroundLayerCheckBox->setChecked( wmsBackgroundLayer.toBool() );
 
  mLegendPlaceholderWidget->setLastPathSettingsKey( QStringLiteral( "lastLegendPlaceholderDir" ) );
  mLegendPlaceholderWidget->setSource( mRasterLayer->legendPlaceholderImage() );
  mLegendConfigEmbeddedWidget->setLayer( mRasterLayer );
 
  mTemporalWidget->syncToLayer();
 
  mPropertyCollection = mRasterLayer->pipe()->dataDefinedProperties();
  updateDataDefinedButtons();
 
  for ( QgsMapLayerConfigWidget *page : std::as_const( mLayerPropertiesPages ) )
  {
    page->syncToLayer( mRasterLayer );
  }
 
}
 
void QgsRasterLayerProperties::apply()
{
  if ( mSourceWidget )
  {
    const QString newSource = mSourceWidget->sourceUri();
    if ( newSource != mRasterLayer->source() )
    {
      mRasterLayer->setDataSource( newSource, mRasterLayer->name(), mRasterLayer->providerType(), QgsDataProvider::ProviderOptions() );
    }
  }
 
  // Do nothing on "bad" layers
  if ( !mRasterLayer->isValid() )
    return;
 
  // apply all plugin dialogs
  for ( QgsMapLayerConfigWidget *page : std::as_const( mLayerPropertiesPages ) )
  {
    page->apply();
  }
 
 
  /*
   * Legend Tab
   */
  mRasterLayer->setLegendPlaceholderImage( mLegendPlaceholderWidget->source() );
  mLegendConfigEmbeddedWidget->applyToLayer();
 
  QgsDebugMsgLevel( QStringLiteral( "apply processing symbology tab" ), 3 );
  /*
   * Symbology Tab
   */
 
  //set whether the layer histogram should be inverted
  //mRasterLayer->setInvertHistogram( cboxInvertColorMap->isChecked() );
 
  mRasterLayer->brightnessFilter()->setBrightness( mSliderBrightness->value() );
  mRasterLayer->brightnessFilter()->setContrast( mSliderContrast->value() );
  mRasterLayer->brightnessFilter()->setGamma( mGammaSpinBox->value() );
 
  QgsDebugMsgLevel( QStringLiteral( "processing transparency tab" ), 3 );
  /*
   * Transparent Pixel Tab
   */
 
  //set NoDataValue
  QgsRasterRangeList myNoDataRangeList;
  if ( "" != mRasterTransparencyWidget->leNoDataValue->text() )
  {
    bool myDoubleOk = false;
    double myNoDataValue = QgsDoubleValidator::toDouble( mRasterTransparencyWidget->leNoDataValue->text(), &myDoubleOk );
    if ( myDoubleOk )
    {
      QgsRasterRange myNoDataRange( myNoDataValue, myNoDataValue );
      myNoDataRangeList << myNoDataRange;
    }
  }
  for ( int bandNo = 1; bandNo <= mRasterLayer->dataProvider()->bandCount(); bandNo++ )
  {
    mRasterLayer->dataProvider()->setUserNoDataValue( bandNo, myNoDataRangeList );
    mRasterLayer->dataProvider()->setUseSourceNoDataValue( bandNo, mRasterTransparencyWidget->mSrcNoDataValueCheckBox->isChecked() );
  }
 
  //set renderer from widget
  QgsRasterRendererWidget *rendererWidget = dynamic_cast<QgsRasterRendererWidget *>( mRendererStackedWidget->currentWidget() );
  if ( rendererWidget )
  {
    rendererWidget->doComputations();
 
    mRasterLayer->setRenderer( rendererWidget->renderer() );
  }
 
  mBackupCrs = mRasterLayer->crs();
  mMetadataWidget->acceptMetadata();
  mMetadataFilled = false;
 
  //transparency settings
  QgsRasterRenderer *rasterRenderer = mRasterLayer->renderer();
  if ( rasterRenderer )
  {
    rasterRenderer->setAlphaBand( mRasterTransparencyWidget->cboxTransparencyBand->currentBand() );
    rasterRenderer->setNodataColor( mRasterTransparencyWidget->mNodataColorButton->color() );
 
    //Walk through each row in table and test value. If not valid set to 0.0 and continue building transparency list
    QgsRasterTransparency *rasterTransparency = new QgsRasterTransparency();
    if ( mRasterTransparencyWidget->tableTransparency->columnCount() == 4 )
    {
      QgsRasterTransparency::TransparentThreeValuePixel myTransparentPixel;
      QList<QgsRasterTransparency::TransparentThreeValuePixel> myTransparentThreeValuePixelList;
      for ( int myListRunner = 0; myListRunner < mRasterTransparencyWidget->tableTransparency->rowCount(); myListRunner++ )
      {
        myTransparentPixel.red = transparencyCellValue( myListRunner, 0 );
        myTransparentPixel.green = transparencyCellValue( myListRunner, 1 );
        myTransparentPixel.blue = transparencyCellValue( myListRunner, 2 );
        myTransparentPixel.percentTransparent = transparencyCellValue( myListRunner, 3 );
        myTransparentThreeValuePixelList.append( myTransparentPixel );
      }
      rasterTransparency->setTransparentThreeValuePixelList( myTransparentThreeValuePixelList );
    }
    else if ( mRasterTransparencyWidget->tableTransparency->columnCount() == 3 )
    {
      QgsRasterTransparency::TransparentSingleValuePixel myTransparentPixel;
      QList<QgsRasterTransparency::TransparentSingleValuePixel> myTransparentSingleValuePixelList;
      for ( int myListRunner = 0; myListRunner < mRasterTransparencyWidget->tableTransparency->rowCount(); myListRunner++ )
      {
        myTransparentPixel.min = transparencyCellValue( myListRunner, 0 );
        myTransparentPixel.max = transparencyCellValue( myListRunner, 1 );
        myTransparentPixel.percentTransparent = transparencyCellValue( myListRunner, 2 );
 
        myTransparentSingleValuePixelList.append( myTransparentPixel );
      }
      rasterTransparency->setTransparentSingleValuePixelList( myTransparentSingleValuePixelList );
    }
 
    rasterRenderer->setRasterTransparency( rasterTransparency );
 
    // Sync the layer styling widget
    mRasterLayer->emitStyleChanged();
 
    //set global transparency
    rasterRenderer->setOpacity( mRasterTransparencyWidget->mOpacityWidget->opacity() );
  }
 
  QgsDebugMsgLevel( QStringLiteral( "processing general tab" ), 3 );
  /*
   * General Tab
   */
  mRasterLayer->setName( mLayerOrigNameLineEd->text() );
 
  // set up the scale based layer visibility stuff....
  mRasterLayer->setScaleBasedVisibility( chkUseScaleDependentRendering->isChecked() );
  mRasterLayer->setMinimumScale( mScaleRangeWidget->minimumScale() );
  mRasterLayer->setMaximumScale( mScaleRangeWidget->maximumScale() );
 
  mRasterLayer->setAutoRefreshInterval( mRefreshLayerIntervalSpinBox->value() * 1000.0 );
  mRasterLayer->setAutoRefreshEnabled( mRefreshLayerCheckBox->isChecked() );
 
  //update the legend pixmap
  // pixmapLegend->setPixmap( mRasterLayer->legendAsPixmap() );
  // pixmapLegend->setScaledContents( true );
  // pixmapLegend->repaint();
 
  mResamplingUtils.refreshLayerFromWidgets();
 
  // Hue and saturation controls
  QgsHueSaturationFilter *hueSaturationFilter = mRasterLayer->hueSaturationFilter();
  if ( hueSaturationFilter )
  {
    hueSaturationFilter->setSaturation( sliderSaturation->value() );
    hueSaturationFilter->setGrayscaleMode( ( QgsHueSaturationFilter::GrayscaleMode ) comboGrayscale->currentIndex() );
    hueSaturationFilter->setColorizeOn( mColorizeCheck->checkState() );
    hueSaturationFilter->setColorizeColor( btnColorizeColor->color() );
    hueSaturationFilter->setColorizeStrength( sliderColorizeStrength->value() );
    hueSaturationFilter->setInvertColors( mInvertColorsCheck->isChecked() );
  }
 
  //set the blend mode for the layer
  mRasterLayer->setBlendMode( mBlendModeComboBox->blendMode() );
 
  // Update temporal properties
  mTemporalWidget->saveTemporalProperties();
 
  mRasterLayer->setCrs( mCrsSelector->crs() );
 
  if ( mRasterLayer->shortName() != mLayerShortNameLineEdit->text() )
    mMetadataFilled = false;
  mRasterLayer->setShortName( mLayerShortNameLineEdit->text() );
 
  if ( mRasterLayer->title() != mLayerTitleLineEdit->text() )
    mMetadataFilled = false;
  mRasterLayer->setTitle( mLayerTitleLineEdit->text() );
 
  if ( mRasterLayer->abstract() != mLayerAbstractTextEdit->toPlainText() )
    mMetadataFilled = false;
  mRasterLayer->setAbstract( mLayerAbstractTextEdit->toPlainText() );
 
  if ( mRasterLayer->keywordList() != mLayerKeywordListLineEdit->text() )
    mMetadataFilled = false;
  mRasterLayer->setKeywordList( mLayerKeywordListLineEdit->text() );
 
  if ( mRasterLayer->dataUrl() != mLayerDataUrlLineEdit->text() )
    mMetadataFilled = false;
  mRasterLayer->setDataUrl( mLayerDataUrlLineEdit->text() );
 
  if ( mRasterLayer->dataUrlFormat() != mLayerDataUrlFormatComboBox->currentText() )
    mMetadataFilled = false;
  mRasterLayer->setDataUrlFormat( mLayerDataUrlFormatComboBox->currentText() );
 
  //layer attribution
  if ( mRasterLayer->attribution() != mLayerAttributionLineEdit->text() )
    mMetadataFilled = false;
  mRasterLayer->setAttribution( mLayerAttributionLineEdit->text() );
 
  if ( mRasterLayer->attributionUrl() != mLayerAttributionUrlLineEdit->text() )
    mMetadataFilled = false;
  mRasterLayer->setAttributionUrl( mLayerAttributionUrlLineEdit->text() );
 
  // Metadata URL
  QList<QgsMapLayerServerProperties::MetadataUrl> metaUrls;
  for ( int row = 0; row < mMetadataUrlModel->rowCount() ; row++ )
  {
    QgsMapLayerServerProperties::MetadataUrl metaUrl;
    metaUrl.url = mMetadataUrlModel->item( row, 0 )->text();
    metaUrl.type = mMetadataUrlModel->item( row, 1 )->text();
    metaUrl.format = mMetadataUrlModel->item( row, 2 )->text();
    metaUrls.append( metaUrl );
    mMetadataFilled = false;
  }
  mRasterLayer->serverProperties()->setMetadataUrls( metaUrls );
 
  if ( mRasterLayer->legendUrl() != mLayerLegendUrlLineEdit->text() )
    mMetadataFilled = false;
  mRasterLayer->setLegendUrl( mLayerLegendUrlLineEdit->text() );
 
  if ( mRasterLayer->legendUrlFormat() != mLayerLegendUrlFormatComboBox->currentText() )
    mMetadataFilled = false;
  mRasterLayer->setLegendUrlFormat( mLayerLegendUrlFormatComboBox->currentText() );
 
  if ( !mWMSPrintLayerLineEdit->text().isEmpty() )
  {
    mRasterLayer->setCustomProperty( QStringLiteral( "WMSPrintLayer" ), mWMSPrintLayerLineEdit->text() );
  }
 
  mRasterLayer->setCustomProperty( "WMSPublishDataSourceUrl", mPublishDataSourceUrlCheckBox->isChecked() );
  mRasterLayer->setCustomProperty( "WMSBackgroundLayer", mBackgroundLayerCheckBox->isChecked() );
 
  mRasterLayer->pipe()->setDataDefinedProperties( mPropertyCollection );
 
  mRasterLayer->setMapTipsEnabled( mEnableMapTips->isChecked() );
  mRasterLayer->setMapTipTemplate( mMapTipWidget->text() );
 
  // Force a redraw of the legend
  mRasterLayer->setLegend( QgsMapLayerLegend::defaultRasterLegend( mRasterLayer ) );
 
  //make sure the layer is redrawn
  mRasterLayer->triggerRepaint();
 
  // notify the project we've made a change
  QgsProject::instance()->setDirty( true );
}
 
void QgsRasterLayerProperties::buttonBuildPyramids_clicked()
{
  QgsRasterDataProvider *provider = mRasterLayer->dataProvider();
 
  std::unique_ptr< QgsRasterBlockFeedback > feedback( new QgsRasterBlockFeedback() );
 
  connect( feedback.get(), &QgsRasterBlockFeedback::progressChanged, mPyramidProgress, &QProgressBar::setValue );
  //
  // Go through the list marking any files that are selected in the listview
  // as true so that we can generate pyramids for them.
  //
  QList< QgsRasterPyramid> myPyramidList = provider->buildPyramidList();
  for ( int myCounterInt = 0; myCounterInt < lbxPyramidResolutions->count(); myCounterInt++ )
  {
    QListWidgetItem *myItem = lbxPyramidResolutions->item( myCounterInt );
    //mark to be pyramided
    myPyramidList[myCounterInt].setBuild( myItem->isSelected() || myPyramidList[myCounterInt].getExists() );
  }
 
  // keep it in sync with qgsrasterpyramidsoptionwidget.cpp
  QString prefix = provider->name() + "/driverOptions/_pyramids/";
  QgsSettings mySettings;
  QString resamplingMethod( cboResamplingMethod->currentData().toString() );
  mySettings.setValue( prefix + "resampling", resamplingMethod );
 
  //
  // Ask raster layer to build the pyramids
  //
 
  // let the user know we're going to possibly be taking a while
  QApplication::setOverrideCursor( Qt::WaitCursor );
  QString res = provider->buildPyramids(
                  myPyramidList,
                  resamplingMethod,
                  cbxPyramidsFormat->currentData().value< Qgis::RasterPyramidFormat >(),
                  QStringList(),
                  feedback.get() );
  QApplication::restoreOverrideCursor();
  mPyramidProgress->setValue( 0 );
  buttonBuildPyramids->setEnabled( false );
  if ( !res.isNull() )
  {
    if ( res == QLatin1String( "CANCELED" ) )
    {
      // user canceled
    }
    else if ( res == QLatin1String( "ERROR_WRITE_ACCESS" ) )
    {
      QMessageBox::warning( this, tr( "Building Pyramids" ),
                            tr( "Write access denied. Adjust the file permissions and try again." ) );
    }
    else if ( res == QLatin1String( "ERROR_WRITE_FORMAT" ) )
    {
      QMessageBox::warning( this, tr( "Building Pyramids" ),
                            tr( "The file was not writable. Some formats do not "
                                "support pyramid overviews. Consult the GDAL documentation if in doubt." ) );
    }
    else if ( res == QLatin1String( "FAILED_NOT_SUPPORTED" ) )
    {
      QMessageBox::warning( this, tr( "Building Pyramids" ),
                            tr( "Building pyramid overviews is not supported on this type of raster." ) );
    }
    else if ( res == QLatin1String( "ERROR_JPEG_COMPRESSION" ) )
    {
      QMessageBox::warning( this, tr( "Building Pyramids" ),
                            tr( "Building internal pyramid overviews is not supported on raster layers with JPEG compression and your current libtiff library." ) );
    }
    else if ( res == QLatin1String( "ERROR_VIRTUAL" ) )
    {
      QMessageBox::warning( this, tr( "Building Pyramids" ),
                            tr( "Building pyramid overviews is not supported on this type of raster." ) );
    }
 
  }
 
  //
  // repopulate the pyramids list
  //
  lbxPyramidResolutions->clear();
  // Need to rebuild list as some or all pyramids may have failed to build
  myPyramidList = provider->buildPyramidList();
  QIcon myPyramidPixmap( QgsApplication::getThemeIcon( "/mIconPyramid.svg" ) );
  QIcon myNoPyramidPixmap( QgsApplication::getThemeIcon( "/mIconNoPyramid.svg" ) );
 
  for ( const QgsRasterPyramid &pyramid : std::as_const( myPyramidList ) )
  {
    if ( pyramid.getExists() )
    {
      lbxPyramidResolutions->addItem( new QListWidgetItem( myPyramidPixmap,
                                      QString::number( pyramid.getXDim() ) + QStringLiteral( " x " ) +
                                      QString::number( pyramid.getYDim() ) ) );
    }
    else
    {
      lbxPyramidResolutions->addItem( new QListWidgetItem( myNoPyramidPixmap,
                                      QString::number( pyramid.getXDim() ) + QStringLiteral( " x " ) +
                                      QString::number( pyramid.getYDim() ) ) );
    }
  }
  //update the legend pixmap
  // pixmapLegend->setPixmap( mRasterLayer->legendAsPixmap() );
  // pixmapLegend->setScaledContents( true );
  // pixmapLegend->repaint();
 
  //populate the metadata tab's text browser widget with gdal metadata info
  updateInformationContent();
}
 
void QgsRasterLayerProperties::urlClicked( const QUrl &url )
{
  QFileInfo file( url.toLocalFile() );
  if ( file.exists() && !file.isDir() )
    QgsGui::nativePlatformInterface()->openFileExplorerAndSelectFile( url.toLocalFile() );
  else
    QDesktopServices::openUrl( url );
}
 
void QgsRasterLayerProperties::mRenderTypeComboBox_currentIndexChanged( int index )
{
  if ( index < 0 || mDisableRenderTypeComboBoxCurrentIndexChanged || ! mRasterLayer->renderer() )
  {
    return;
  }
 
  QString rendererName = mRenderTypeComboBox->itemData( index ).toString();
  setRendererWidget( rendererName );
}
 
void QgsRasterLayerProperties::mCrsSelector_crsChanged( const QgsCoordinateReferenceSystem &crs )
{
  QgsDatumTransformDialog::run( crs, QgsProject::instance()->crs(), this, mMapCanvas, tr( "Select Transformation" ) );
  mRasterLayer->setCrs( crs );
  mMetadataWidget->crsChanged();
}
 
void QgsRasterLayerProperties::setTransparencyCell( int row, int column, double value )
{
  QgsDebugMsgLevel( QStringLiteral( "value = %1" ).arg( value, 0, 'g', 17 ), 3 );
  QgsRasterDataProvider *provider = mRasterLayer->dataProvider();
  if ( !provider ) return;
 
  QgsRasterRenderer *renderer = mRendererWidget->renderer();
  if ( !renderer ) return;
  int nBands = renderer->usesBands().size();
 
  QLineEdit *lineEdit = new QLineEdit();
  lineEdit->setFrame( false ); // frame looks bad in table
  // Without margins row selection is not displayed (important for delete row)
  lineEdit->setContentsMargins( 1, 1, 1, 1 );
 
  if ( column == mRasterTransparencyWidget->tableTransparency->columnCount() - 1 )
  {
    // transparency
    // Who needs transparency as floating point?
    lineEdit->setValidator( new QIntValidator( nullptr ) );
    lineEdit->setText( QString::number( static_cast<int>( value ) ) );
  }
  else
  {
    // value
    QString valueString;
    switch ( provider->sourceDataType( 1 ) )
    {
      case Qgis::DataType::Float32:
      case Qgis::DataType::Float64:
        lineEdit->setValidator( new QgsDoubleValidator( nullptr ) );
        if ( !std::isnan( value ) )
        {
          double v = QgsRasterBlock::printValue( value ).toDouble();
          valueString = QLocale().toString( v, 'g' ) ;
        }
        break;
      default:
        lineEdit->setValidator( new QIntValidator( nullptr ) );
        if ( !std::isnan( value ) )
        {
          valueString = QLocale().toString( static_cast<int>( value ) );
        }
        break;
    }
    lineEdit->setText( valueString );
  }
  mRasterTransparencyWidget->tableTransparency->setCellWidget( row, column, lineEdit );
  adjustTransparencyCellWidth( row, column );
 
  if ( nBands == 1 && ( column == 0 || column == 1 ) )
  {
    connect( lineEdit, &QLineEdit::textEdited, this, &QgsRasterLayerProperties::transparencyCellTextEdited );
  }
  mRasterTransparencyWidget->tableTransparency->resizeColumnsToContents();
}
 
void QgsRasterLayerProperties::setTransparencyCellValue( int row, int column, double value )
{
  QLineEdit *lineEdit = dynamic_cast<QLineEdit *>( mRasterTransparencyWidget->tableTransparency->cellWidget( row, column ) );
  if ( !lineEdit ) return;
  double v = QgsRasterBlock::printValue( value ).toDouble();
  lineEdit->setText( QLocale().toString( v, 'g' ) );
  lineEdit->adjustSize();
  adjustTransparencyCellWidth( row, column );
  mRasterTransparencyWidget->tableTransparency->resizeColumnsToContents();
}
 
double QgsRasterLayerProperties::transparencyCellValue( int row, int column )
{
  QLineEdit *lineEdit = dynamic_cast<QLineEdit *>( mRasterTransparencyWidget->tableTransparency->cellWidget( row, column ) );
  if ( !lineEdit || lineEdit->text().isEmpty() )
  {
    return std::numeric_limits<double>::quiet_NaN();
  }
  return QLocale().toDouble( lineEdit->text() );
}
 
void QgsRasterLayerProperties::adjustTransparencyCellWidth( int row, int column )
{
  QLineEdit *lineEdit = dynamic_cast<QLineEdit *>( mRasterTransparencyWidget->tableTransparency->cellWidget( row, column ) );
  if ( !lineEdit ) return;
 
  int width = std::max( lineEdit->fontMetrics().boundingRect( lineEdit->text() ).width() + 10, 100 );
  width = std::max( width, mRasterTransparencyWidget->tableTransparency->columnWidth( column ) );
 
  lineEdit->setFixedWidth( width );
}
 
void QgsRasterLayerProperties::transparencyCellTextEdited( const QString &text )
{
  Q_UNUSED( text )
  QgsDebugMsgLevel( QStringLiteral( "text = %1" ).arg( text ), 3 );
  QgsRasterRenderer *renderer = mRendererWidget->renderer();
  if ( !renderer )
  {
    return;
  }
  int nBands = renderer->usesBands().size();
  if ( nBands == 1 )
  {
    QLineEdit *lineEdit = qobject_cast<QLineEdit *>( sender() );
    if ( !lineEdit ) return;
    int row = -1;
    int column = -1;
    for ( int r = 0; r < mRasterTransparencyWidget->tableTransparency->rowCount(); r++ )
    {
      for ( int c = 0; c < mRasterTransparencyWidget->tableTransparency->columnCount(); c++ )
      {
        if ( mRasterTransparencyWidget->tableTransparency->cellWidget( r, c ) == sender() )
        {
          row = r;
          column = c;
          break;
        }
      }
      if ( row != -1 ) break;
    }
    QgsDebugMsgLevel( QStringLiteral( "row = %1 column =%2" ).arg( row ).arg( column ), 3 );
 
    if ( column == 0 )
    {
      QLineEdit *toLineEdit = dynamic_cast<QLineEdit *>( mRasterTransparencyWidget->tableTransparency->cellWidget( row, 1 ) );
      if ( !toLineEdit ) return;
      bool toChanged = mTransparencyToEdited.value( row );
      QgsDebugMsgLevel( QStringLiteral( "toChanged = %1" ).arg( toChanged ), 3 );
      if ( !toChanged )
      {
        toLineEdit->setText( lineEdit->text() );
      }
    }
    else if ( column == 1 )
    {
      setTransparencyToEdited( row );
    }
  }
}
 
void QgsRasterLayerProperties::aboutToShowStyleMenu()
{
  // this should be unified with QgsVectorLayerProperties::aboutToShowStyleMenu()
 
  QMenu *m = qobject_cast<QMenu *>( sender() );
 
  QgsMapLayerStyleGuiUtils::instance()->removesExtraMenuSeparators( m );
  // re-add style manager actions!
  m->addSeparator();
  QgsMapLayerStyleGuiUtils::instance()->addStyleManagerActions( m, mRasterLayer );
}
 
void QgsRasterLayerProperties::syncToLayer()
{
  QgsRasterRenderer *renderer = mRasterLayer->renderer();
  if ( renderer )
  {
    setRendererWidget( renderer->type() );
  }
  sync();
  mRasterLayer->triggerRepaint();
}
 
void QgsRasterLayerProperties::setTransparencyToEdited( int row )
{
  if ( row >= mTransparencyToEdited.size() )
  {
    mTransparencyToEdited.resize( row + 1 );
  }
  mTransparencyToEdited[row] = true;
}
 
void QgsRasterLayerProperties::optionsStackedWidget_CurrentChanged( int index )
{
  QgsOptionsDialogBase::optionsStackedWidget_CurrentChanged( index );
 
  bool isMetadataPanel = ( index == mOptStackedWidget->indexOf( mOptsPage_Metadata ) );
  mBtnStyle->setVisible( ! isMetadataPanel );
  mBtnMetadata->setVisible( isMetadataPanel );
 
  if ( !mHistogramWidget )
    return;
 
  if ( index == mOptStackedWidget->indexOf( mOptsPage_Histogram ) )
  {
    mHistogramWidget->setActive( true );
  }
  else
  {
    mHistogramWidget->setActive( false );
  }
 
  if ( index == mOptStackedWidget->indexOf( mOptsPage_Information ) || !mMetadataFilled )
  {
    //set the metadata contents (which can be expensive)
    updateInformationContent();
  }
}
 
void QgsRasterLayerProperties::initializeDataDefinedButton( QgsPropertyOverrideButton *button, QgsRasterPipe::Property key )
{
  button->blockSignals( true );
  button->init( key, mPropertyCollection, QgsRasterPipe::propertyDefinitions(), nullptr );
  connect( button, &QgsPropertyOverrideButton::changed, this, &QgsRasterLayerProperties::updateProperty );
  button->registerExpressionContextGenerator( this );
  button->blockSignals( false );
}
 
void QgsRasterLayerProperties::updateDataDefinedButtons()
{
  const auto propertyOverrideButtons { findChildren< QgsPropertyOverrideButton * >() };
  for ( QgsPropertyOverrideButton *button : propertyOverrideButtons )
  {
    updateDataDefinedButton( button );
  }
}
 
void QgsRasterLayerProperties::updateDataDefinedButton( QgsPropertyOverrideButton *button )
{
  if ( !button )
    return;
 
  if ( button->propertyKey() < 0 )
    return;
 
  QgsRasterPipe::Property key = static_cast< QgsRasterPipe::Property >( button->propertyKey() );
  whileBlocking( button )->setToProperty( mPropertyCollection.property( key ) );
}
 
void QgsRasterLayerProperties::updateProperty()
{
  QgsPropertyOverrideButton *button = qobject_cast<QgsPropertyOverrideButton *>( sender() );
  QgsRasterPipe::Property key = static_cast<  QgsRasterPipe::Property >( button->propertyKey() );
  mPropertyCollection.setProperty( key, button->toProperty() );
}
 
void QgsRasterLayerProperties::toggleSaturationControls( int grayscaleMode )
{
  // Enable or disable saturation controls based on choice of grayscale mode
  if ( grayscaleMode == 0 )
  {
    sliderSaturation->setEnabled( true );
    spinBoxSaturation->setEnabled( true );
  }
  else
  {
    sliderSaturation->setEnabled( false );
    spinBoxSaturation->setEnabled( false );
  }
}
 
void QgsRasterLayerProperties::toggleColorizeControls( bool colorizeEnabled )
{
  // Enable or disable colorize controls based on checkbox
  btnColorizeColor->setEnabled( colorizeEnabled );
  sliderColorizeStrength->setEnabled( colorizeEnabled );
  spinColorizeStrength->setEnabled( colorizeEnabled );
}
 
 
QLinearGradient QgsRasterLayerProperties::redGradient()
{
  //define a gradient
  // TODO change this to actual polygon dims
  QLinearGradient myGradient = QLinearGradient( mGradientWidth, 0, mGradientWidth, mGradientHeight );
  myGradient.setColorAt( 0.0, QColor( 242, 14, 25, 190 ) );
  myGradient.setColorAt( 0.5, QColor( 175, 29, 37, 190 ) );
  myGradient.setColorAt( 1.0, QColor( 114, 17, 22, 190 ) );
  return myGradient;
}
QLinearGradient QgsRasterLayerProperties::greenGradient()
{
  //define a gradient
  // TODO change this to actual polygon dims
  QLinearGradient myGradient = QLinearGradient( mGradientWidth, 0, mGradientWidth, mGradientHeight );
  myGradient.setColorAt( 0.0, QColor( 48, 168, 5, 190 ) );
  myGradient.setColorAt( 0.8, QColor( 36, 122, 4, 190 ) );
  myGradient.setColorAt( 1.0, QColor( 21, 71, 2, 190 ) );
  return myGradient;
}
QLinearGradient QgsRasterLayerProperties::blueGradient()
{
  //define a gradient
  // TODO change this to actual polygon dims
  QLinearGradient myGradient = QLinearGradient( mGradientWidth, 0, mGradientWidth, mGradientHeight );
  myGradient.setColorAt( 0.0, QColor( 30, 0, 106, 190 ) );
  myGradient.setColorAt( 0.2, QColor( 30, 72, 128, 190 ) );
  myGradient.setColorAt( 1.0, QColor( 30, 223, 196, 190 ) );
  return myGradient;
}
QLinearGradient QgsRasterLayerProperties::grayGradient()
{
  //define a gradient
  // TODO change this to actual polygon dims
  QLinearGradient myGradient = QLinearGradient( mGradientWidth, 0, mGradientWidth, mGradientHeight );
  myGradient.setColorAt( 0.0, QColor( 5, 5, 5, 190 ) );
  myGradient.setColorAt( 0.8, QColor( 122, 122, 122, 190 ) );
  myGradient.setColorAt( 1.0, QColor( 220, 220, 220, 190 ) );
  return myGradient;
}
QLinearGradient QgsRasterLayerProperties::highlightGradient()
{
  //define another gradient for the highlight
  // TODO change this to actual polygon dims
  QLinearGradient myGradient = QLinearGradient( mGradientWidth, 0, mGradientWidth, mGradientHeight );
  myGradient.setColorAt( 1.0, QColor( 255, 255, 255, 50 ) );
  myGradient.setColorAt( 0.5, QColor( 255, 255, 255, 100 ) );
  myGradient.setColorAt( 0.0, QColor( 255, 255, 255, 150 ) );
  return myGradient;
}
 
void QgsRasterLayerProperties::addMetadataUrl()
{
  const int row = mMetadataUrlModel->rowCount();
  mMetadataUrlModel->setItem( row, 0, new QStandardItem( QLatin1String() ) );
  mMetadataUrlModel->setItem( row, 1, new QStandardItem( QLatin1String() ) );
  mMetadataUrlModel->setItem( row, 2, new QStandardItem( QLatin1String() ) );
}
 
void QgsRasterLayerProperties::removeSelectedMetadataUrl()
{
  const QModelIndexList selectedRows = tableViewMetadataUrl->selectionModel()->selectedRows();
  if ( selectedRows.empty() )
    return;
  mMetadataUrlModel->removeRow( selectedRows[0].row() );
}
 
 
//
//
// Next four methods for saving and restoring qml style state
//
//
void QgsRasterLayerProperties::loadDefaultStyle()
{
  bool defaultLoadedFlag = false;
  QString myMessage = mRasterLayer->loadDefaultStyle( defaultLoadedFlag );
  //reset if the default style was loaded OK only
  if ( defaultLoadedFlag )
  {
    syncToLayer();
  }
  else
  {
    //otherwise let the user know what went wrong
    QMessageBox::information( this,
                              tr( "Default Style" ),
                              myMessage
                            );
  }
}
 
void QgsRasterLayerProperties::saveDefaultStyle()
{
 
  apply(); // make sure the style to save is up-to-date
 
  // a flag passed by reference
  bool defaultSavedFlag = false;
  // TODO Once the deprecated `saveDefaultStyle()` method is gone, just
  // remove the NOWARN_DEPRECATED tags
  Q_NOWARN_DEPRECATED_PUSH
  // after calling this the above flag will be set true for success
  // or false if the save operation failed
  QString myMessage = mRasterLayer->saveDefaultStyle( defaultSavedFlag );
  Q_NOWARN_DEPRECATED_POP
  if ( !defaultSavedFlag )
  {
    //let the user know what went wrong
    QMessageBox::information( this,
                              tr( "Default Style" ),
                              myMessage
                            );
  }
}
 
 
void QgsRasterLayerProperties::loadStyle()
{
  QgsSettings settings;
  QString lastUsedDir = settings.value( QStringLiteral( "style/lastStyleDir" ), QDir::homePath() ).toString();
 
  QString fileName = QFileDialog::getOpenFileName(
                       this,
                       tr( "Load layer properties from style file" ),
                       lastUsedDir,
                       tr( "QGIS Layer Style File" ) + " (*.qml)" );
  if ( fileName.isEmpty() )
    return;
 
  // ensure the user never omits the extension from the file name
  if ( !fileName.endsWith( QLatin1String( ".qml" ), Qt::CaseInsensitive ) )
    fileName += QLatin1String( ".qml" );
 
  mOldStyle = mRasterLayer->styleManager()->style( mRasterLayer->styleManager()->currentStyle() );
 
  bool defaultLoadedFlag = false;
  QString message = mRasterLayer->loadNamedStyle( fileName, defaultLoadedFlag );
  if ( defaultLoadedFlag )
  {
    settings.setValue( QStringLiteral( "style/lastStyleDir" ), QFileInfo( fileName ).absolutePath() );
    syncToLayer();
  }
  else
  {
    QMessageBox::information( this, tr( "Save Style" ), message );
  }
}
 
 
void QgsRasterLayerProperties::saveStyleAs()
{
  QgsSettings settings;
  QString lastUsedDir = settings.value( QStringLiteral( "style/lastStyleDir" ), QDir::homePath() ).toString();
 
  QString selectedFilter;
  QString outputFileName = QFileDialog::getSaveFileName(
                             this,
                             tr( "Save layer properties as style file" ),
                             lastUsedDir,
                             tr( "QGIS Layer Style File" ) + " (*.qml)" + ";;" + tr( "Styled Layer Descriptor" ) + " (*.sld)",
                             &selectedFilter );
  if ( outputFileName.isEmpty() )
    return;
 
  StyleType type;
  // use selectedFilter to set style type
  if ( selectedFilter.contains( QStringLiteral( ".qml" ), Qt::CaseInsensitive ) )
  {
    outputFileName = QgsFileUtils::ensureFileNameHasExtension( outputFileName, QStringList() << QStringLiteral( "qml" ) );
    type = StyleType::QML;
  }
  else
  {
    outputFileName = QgsFileUtils::ensureFileNameHasExtension( outputFileName, QStringList() << QStringLiteral( "sld" ) );
    type = StyleType::SLD;
  }
 
  apply(); // make sure the style to save is up-to-date
 
  // then export style
  bool defaultLoadedFlag = false;
  QString message;
  switch ( type )
  {
    case QML:
    {
      message = mRasterLayer->saveNamedStyle( outputFileName, defaultLoadedFlag );
      break;
    }
    case SLD:
    {
      message = mRasterLayer->saveSldStyle( outputFileName, defaultLoadedFlag );
      break;
    }
  }
  if ( defaultLoadedFlag )
  {
    settings.setValue( QStringLiteral( "style/lastStyleDir" ), QFileInfo( outputFileName ).absolutePath() );
    sync();
  }
  else
    QMessageBox::information( this, tr( "Save Style" ), message );
}
 
void QgsRasterLayerProperties::restoreWindowModality()
{
  hide();
  setModal( true );
  show();
  raise();
  activateWindow();
}
 
//
//
// Next four methods for saving and restoring QMD metadata
//
//
 
void QgsRasterLayerProperties::loadMetadata()
{
  QgsSettings myQSettings;  // where we keep last used filter in persistent state
  QString myLastUsedDir = myQSettings.value( QStringLiteral( "style/lastStyleDir" ), QDir::homePath() ).toString();
 
  QString myFileName = QFileDialog::getOpenFileName( this, tr( "Load layer metadata from metadata file" ), myLastUsedDir,
                       tr( "QGIS Layer Metadata File" ) + " (*.qmd)" );
  if ( myFileName.isNull() )
  {
    return;
  }
 
  QString myMessage;
  bool defaultLoadedFlag = false;
  myMessage = mRasterLayer->loadNamedMetadata( myFileName, defaultLoadedFlag );
 
  //reset if the default style was loaded OK only
  if ( defaultLoadedFlag )
  {
    mMetadataWidget->setMetadata( &mRasterLayer->metadata() );
  }
  else
  {
    //let the user know what went wrong
    QMessageBox::warning( this, tr( "Load Metadata" ), myMessage );
  }
 
  QFileInfo myFI( myFileName );
  QString myPath = myFI.path();
  myQSettings.setValue( QStringLiteral( "style/lastStyleDir" ), myPath );
 
  activateWindow(); // set focus back to properties dialog
}
 
void QgsRasterLayerProperties::saveMetadataAs()
{
  QgsSettings myQSettings;  // where we keep last used filter in persistent state
  QString myLastUsedDir = myQSettings.value( QStringLiteral( "style/lastStyleDir" ), QDir::homePath() ).toString();
 
  QString myOutputFileName = QFileDialog::getSaveFileName( this, tr( "Save Layer Metadata as QMD" ),
                             myLastUsedDir, tr( "QMD File" ) + " (*.qmd)" );
  if ( myOutputFileName.isNull() ) //dialog canceled
  {
    return;
  }
 
  mMetadataWidget->acceptMetadata();
 
  //ensure the user never omitted the extension from the file name
  if ( !myOutputFileName.endsWith( QgsMapLayer::extensionPropertyType( QgsMapLayer::Metadata ), Qt::CaseInsensitive ) )
  {
    myOutputFileName += QgsMapLayer::extensionPropertyType( QgsMapLayer::Metadata );
  }
 
  bool defaultLoadedFlag = false;
  QString message = mRasterLayer->saveNamedMetadata( myOutputFileName, defaultLoadedFlag );
  if ( defaultLoadedFlag )
    myQSettings.setValue( QStringLiteral( "style/lastStyleDir" ), QFileInfo( myOutputFileName ).absolutePath() );
  else
    QMessageBox::information( this, tr( "Save Metadata" ), message );
}
 
void QgsRasterLayerProperties::saveDefaultMetadata()
{
  mMetadataWidget->acceptMetadata();
 
  bool defaultSavedFlag = false;
  QString errorMsg = mRasterLayer->saveDefaultMetadata( defaultSavedFlag );
  if ( !defaultSavedFlag )
  {
    QMessageBox::warning( this, tr( "Default Metadata" ), errorMsg );
  }
}
 
void QgsRasterLayerProperties::loadDefaultMetadata()
{
  bool defaultLoadedFlag = false;
  QString myMessage = mRasterLayer->loadNamedMetadata( mRasterLayer->metadataUri(), defaultLoadedFlag );
  //reset if the default metadata was loaded OK only
  if ( defaultLoadedFlag )
  {
    mMetadataWidget->setMetadata( &mRasterLayer->metadata() );
  }
  else
  {
    QMessageBox::information( this, tr( "Default Metadata" ), myMessage );
  }
}
 
 
void QgsRasterLayerProperties::toggleBuildPyramidsButton()
{
  if ( lbxPyramidResolutions->selectedItems().empty() )
  {
    buttonBuildPyramids->setEnabled( false );
  }
  else
  {
    buttonBuildPyramids->setEnabled( true );
  }
}
 
void QgsRasterLayerProperties::mResetColorRenderingBtn_clicked()
{
  mBlendModeComboBox->setBlendMode( QPainter::CompositionMode_SourceOver );
  mSliderBrightness->setValue( 0 );
  mSliderContrast->setValue( 0 );
  mGammaSpinBox->setValue( 1.0 );
  sliderSaturation->setValue( 0 );
  comboGrayscale->setCurrentIndex( ( int ) QgsHueSaturationFilter::GrayscaleOff );
  mColorizeCheck->setChecked( false );
  sliderColorizeStrength->setValue( 100 );
  mInvertColorsCheck->setChecked( false );
}
 
bool QgsRasterLayerProperties::rasterIsMultiBandColor()
{
  return mRasterLayer && nullptr != dynamic_cast<QgsMultiBandColorRenderer *>( mRasterLayer->renderer() );
}
 
void QgsRasterLayerProperties::updateInformationContent()
{
  const QString myStyle = QgsApplication::reportStyleSheet( QgsApplication::StyleSheetType::WebBrowser );
  // Inject the stylesheet
  const QString html { mRasterLayer->htmlMetadata().replace( QLatin1String( "<head>" ), QStringLiteral( R"raw(<head><style type="text/css">%1</style>)raw" ) ).arg( myStyle ) };
  mMetadataViewer->setHtml( html );
  mMetadataFilled = true;
}
 
void QgsRasterLayerProperties::onCancel()
{
 
  // Give the user a chance to save the raster attribute table edits.
  if ( mRasterAttributeTableWidget && mRasterAttributeTableWidget->isDirty() )
  {
    mRasterAttributeTableWidget->setEditable( false, false );
  }
 
  if ( mOldStyle.xmlData() != mRasterLayer->styleManager()->style( mRasterLayer->styleManager()->currentStyle() ).xmlData() )
  {
    // need to reset style to previous - style applied directly to the layer (not in apply())
    QString myMessage;
    QDomDocument doc( QStringLiteral( "qgis" ) );
    int errorLine, errorColumn;
    doc.setContent( mOldStyle.xmlData(), false, &myMessage, &errorLine, &errorColumn );
    mRasterLayer->importNamedStyle( doc, myMessage );
    syncToLayer();
  }
  if ( mBackupCrs != mRasterLayer->crs() )
    mRasterLayer->setCrs( mBackupCrs );
}
 
void QgsRasterLayerProperties::showHelp()
{
  const QVariant helpPage = mOptionsStackedWidget->currentWidget()->property( "helpPage" );
 
  if ( helpPage.isValid() )
  {
    QgsHelp::openHelp( helpPage.toString() );
  }
  else
  {
    QgsHelp::openHelp( QStringLiteral( "working_with_raster/raster_properties.html" ) );
  }
}
 
void QgsRasterLayerProperties::updateGammaSpinBox( int value )
{
  whileBlocking( mGammaSpinBox )->setValue( value / 100.0 );
}
 
void QgsRasterLayerProperties::updateGammaSlider( double value )
{
  whileBlocking( mSliderGamma )->setValue( value * 100 );
}
 
 
bool QgsRasterLayerProperties::eventFilter( QObject *obj, QEvent *ev )
{
  // If the map tip preview container is resized, resize the map tip
  if ( obj == mMapTipPreviewContainer && ev->type() == QEvent::Resize )
  {
    resizeMapTip();
  }
  return QgsOptionsDialogBase::eventFilter( obj, ev );
}
 
void QgsRasterLayerProperties::initMapTipPreview()
{
  // HTML editor and preview are in a splitter. By default, the editor takes 2/3 of the space
  mMapTipSplitter->setSizes( { 400, 200 } );
  // Event filter is used to resize the map tip when the container is resized
  mMapTipPreviewContainer->installEventFilter( this );
 
  // Note: there's quite a bit of overlap between this and the code in QgsMapTip::showMapTip
  // Create the WebView
  mMapTipPreview = new QgsWebView( mMapTipPreviewContainer );
 
#if WITH_QTWEBKIT
  mMapTipPreview->page()->setLinkDelegationPolicy( QWebPage::DelegateAllLinks );//Handle link clicks by yourself
  mMapTipPreview->setContextMenuPolicy( Qt::NoContextMenu ); //No context menu is allowed if you don't need it
  connect( mMapTipPreview, &QWebView::loadFinished, this, &QgsRasterLayerProperties::resizeMapTip );
#endif
 
  mMapTipPreview->page()->settings()->setAttribute( QWebSettings::DeveloperExtrasEnabled, true );
  mMapTipPreview->page()->settings()->setAttribute( QWebSettings::JavascriptEnabled, true );
  mMapTipPreview->page()->settings()->setAttribute( QWebSettings::LocalStorageEnabled, true );
 
  // Disable scrollbars, avoid random resizing issues
  mMapTipPreview->page()->mainFrame()->setScrollBarPolicy( Qt::Horizontal, Qt::ScrollBarAlwaysOff );
  mMapTipPreview->page()->mainFrame()->setScrollBarPolicy( Qt::Vertical, Qt::ScrollBarAlwaysOff );
 
 
  // Update the map tip preview when the expression or the map tip template changes
  connect( mMapTipWidget, &QgsCodeEditorHTML::textChanged, this, &QgsRasterLayerProperties::updateMapTipPreview );
}
 
void QgsRasterLayerProperties::updateMapTipPreview()
{
  mMapTipPreview->setMaximumSize( mMapTipPreviewContainer->width(), mMapTipPreviewContainer->height() );
  const QString htmlContent = QgsMapTip::rasterMapTipPreviewText( mRasterLayer, mMapCanvas, mMapTipWidget->text() );
  mMapTipPreview->setHtml( htmlContent );
}
 
void QgsRasterLayerProperties::resizeMapTip()
{
  // Ensure the map tip is not bigger than the container
  mMapTipPreview->setMaximumSize( mMapTipPreviewContainer->width(), mMapTipPreviewContainer->height() );
#if WITH_QTWEBKIT
  // Get the content size
  const QWebElement container = mMapTipPreview->page()->mainFrame()->findFirstElement(
                                  QStringLiteral( "#QgsWebViewContainer" ) );
  const int width = container.geometry().width();
  const int height = container.geometry().height();
  mMapTipPreview->resize( width, height );
 
  // Move the map tip to the center of the container
  mMapTipPreview->move( ( mMapTipPreviewContainer->width() - mMapTipPreview->width() ) / 2,
                        ( mMapTipPreviewContainer->height() - mMapTipPreview->height() ) / 2 );
 
#else
  mMapTipPreview->adjustSize();
#endif
}