qgsannotationlayer.cpp

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/***************************************************************************
    qgsannotationlayer.cpp
    ------------------
    copyright            : (C) 2019 by Sandro Mani
    email                : smani at sourcepole dot ch
 ***************************************************************************/
 
/***************************************************************************
 *                                                                         *
 *   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 "qgsannotationlayer.h"
 
#include "RTree.h"
#include "qgsannotationitem.h"
#include "qgsannotationitemeditoperation.h"
#include "qgsannotationitemregistry.h"
#include "qgsannotationlayerrenderer.h"
#include "qgsapplication.h"
#include "qgsfeedback.h"
#include "qgslogger.h"
#include "qgsmaplayerfactory.h"
#include "qgspainteffect.h"
#include "qgspainteffectregistry.h"
#include "qgspainting.h"
#include "qgsthreadingutils.h"
 
#include <QString>
#include <QUuid>
 
#include "moc_qgsannotationlayer.cpp"
 
using namespace Qt::StringLiterals;

class QgsAnnotationLayerSpatialIndex : public RTree<QString, float, 2, float>
{
  public:
    void insert( const QString &uuid, const QgsRectangle &bounds )
    {
      std::array< float, 4 > scaledBounds = scaleBounds( bounds );
      float aMin[2] { scaledBounds[0], scaledBounds[1] };
      float aMax[2] { scaledBounds[2], scaledBounds[3] };
      this->Insert( aMin, aMax, uuid );
    }

    void remove( const QString &uuid, const QgsRectangle &bounds )
    {
      std::array< float, 4 > scaledBounds = scaleBounds( bounds );
      float aMin[2] { scaledBounds[0], scaledBounds[1] };
      float aMax[2] { scaledBounds[2], scaledBounds[3] };
      this->Remove( aMin, aMax, uuid );
    }

    bool intersects( const QgsRectangle &bounds, const std::function< bool( const QString &uuid )> &callback ) const
    {
      std::array< float, 4 > scaledBounds = scaleBounds( bounds );
      float aMin[2] { scaledBounds[0], scaledBounds[1] };
      float aMax[2] { scaledBounds[2], scaledBounds[3] };
      this->Search( aMin, aMax, callback );
      return true;
    }
 
  private:
    std::array<float, 4> scaleBounds( const QgsRectangle &bounds ) const
    {
      return { static_cast< float >( bounds.xMinimum() ), static_cast< float >( bounds.yMinimum() ), static_cast< float >( bounds.xMaximum() ), static_cast< float >( bounds.yMaximum() ) };
    }
};
 
QgsAnnotationLayer::QgsAnnotationLayer( const QString &name, const LayerOptions &options )
  : QgsMapLayer( Qgis::LayerType::Annotation, name )
  , mTransformContext( options.transformContext )
  , mSpatialIndex( std::make_unique< QgsAnnotationLayerSpatialIndex >() )
{
  mShouldValidateCrs = false;
  mValid = true;
 
  QgsDataProvider::ProviderOptions providerOptions;
  providerOptions.transformContext = options.transformContext;
  mDataProvider = std::make_unique<QgsAnnotationLayerDataProvider>( providerOptions, Qgis::DataProviderReadFlags() );
 
  mPaintEffect.reset( QgsPaintEffectRegistry::defaultStack() );
  mPaintEffect->setEnabled( false );
}
 
QgsAnnotationLayer::~QgsAnnotationLayer()
{
  emit willBeDeleted();
  qDeleteAll( mItems );
}
 
void QgsAnnotationLayer::reset()
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  setOpacity( 1.0 );
  setCrs( QgsCoordinateReferenceSystem() );
  setTransformContext( QgsCoordinateTransformContext() );
 
  undoStackStyles()->clear();
 
  clear();
}
 
QString QgsAnnotationLayer::addItem( QgsAnnotationItem *item )
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  const QString uuid = QUuid::createUuid().toString();
  mItems.insert( uuid, item );
  if ( item->flags() & Qgis::AnnotationItemFlag::ScaleDependentBoundingBox )
    mNonIndexedItems.insert( uuid );
  else
    mSpatialIndex->insert( uuid, item->boundingBox() );
 
  triggerRepaint();
 
  return uuid;
}
 
void QgsAnnotationLayer::replaceItem( const QString &id, QgsAnnotationItem *item )
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  std::unique_ptr< QgsAnnotationItem> prevItem( mItems.take( id ) );
 
  if ( prevItem )
  {
    auto it = mNonIndexedItems.find( id );
    if ( it == mNonIndexedItems.end() )
    {
      mSpatialIndex->remove( id, prevItem->boundingBox() );
    }
    else
    {
      mNonIndexedItems.erase( it );
    }
  }
 
  mItems.insert( id, item );
  if ( item->flags() & Qgis::AnnotationItemFlag::ScaleDependentBoundingBox )
    mNonIndexedItems.insert( id );
  else
    mSpatialIndex->insert( id, item->boundingBox() );
 
  triggerRepaint();
}
 
bool QgsAnnotationLayer::removeItem( const QString &id )
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  if ( !mItems.contains( id ) )
    return false;
 
  std::unique_ptr< QgsAnnotationItem> item( mItems.take( id ) );
 
  auto it = mNonIndexedItems.find( id );
  if ( it == mNonIndexedItems.end() )
  {
    mSpatialIndex->remove( id, item->boundingBox() );
  }
  else
  {
    mNonIndexedItems.erase( it );
  }
 
  item.reset();
 
  triggerRepaint();
 
  return true;
}
 
void QgsAnnotationLayer::clear()
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  qDeleteAll( mItems );
  mItems.clear();
  mSpatialIndex = std::make_unique< QgsAnnotationLayerSpatialIndex >();
  mNonIndexedItems.clear();
 
  triggerRepaint();
}
 
bool QgsAnnotationLayer::isEmpty() const
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  return mItems.empty();
}
 
QgsAnnotationItem *QgsAnnotationLayer::item( const QString &id ) const
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  return mItems.value( id );
}
 
QStringList QgsAnnotationLayer::queryIndex( const QgsRectangle &bounds, QgsFeedback *feedback ) const
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  QStringList res;
 
  mSpatialIndex->intersects( bounds, [&res, feedback]( const QString &uuid ) -> bool {
    res << uuid;
    return !feedback || !feedback->isCanceled();
  } );
  return res;
}
 
QStringList QgsAnnotationLayer::itemsInBounds( const QgsRectangle &bounds, QgsRenderContext &context, QgsFeedback *feedback ) const
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  QStringList res = queryIndex( bounds, feedback );
  // we also have to search through any non-indexed items
  for ( const QString &uuid : mNonIndexedItems )
  {
    auto it = mItems.constFind( uuid );
    if ( it != mItems.constEnd() && it.value()->boundingBox( context ).intersects( bounds ) )
      res << uuid;
  }
 
  return res;
}
 
Qgis::AnnotationItemEditOperationResult QgsAnnotationLayer::applyEdit( QgsAbstractAnnotationItemEditOperation *operation )
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  return applyEditV2( operation, QgsAnnotationItemEditContext() );
}
 
Qgis::AnnotationItemEditOperationResult QgsAnnotationLayer::applyEditV2( QgsAbstractAnnotationItemEditOperation *operation, const QgsAnnotationItemEditContext &context )
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  Qgis::AnnotationItemEditOperationResult res = Qgis::AnnotationItemEditOperationResult::Invalid;
  if ( QgsAnnotationItem *targetItem = item( operation->itemId() ) )
  {
    // remove item from index if present
    auto it = mNonIndexedItems.find( operation->itemId() );
    if ( it == mNonIndexedItems.end() )
    {
      mSpatialIndex->remove( operation->itemId(), targetItem->boundingBox() );
    }
    res = targetItem->applyEditV2( operation, context );
 
    switch ( res )
    {
      case Qgis::AnnotationItemEditOperationResult::Success:
      case Qgis::AnnotationItemEditOperationResult::Invalid:
        // re-add to index if possible
        if ( !( targetItem->flags() & Qgis::AnnotationItemFlag::ScaleDependentBoundingBox ) )
          mSpatialIndex->insert( operation->itemId(), targetItem->boundingBox() );
        break;
 
      case Qgis::AnnotationItemEditOperationResult::ItemCleared:
        // item needs removing from layer
        delete mItems.take( operation->itemId() );
        mNonIndexedItems.remove( operation->itemId() );
        break;
    }
  }
 
  if ( res != Qgis::AnnotationItemEditOperationResult::Invalid )
    triggerRepaint();
 
  return res;
}
 
Qgis::MapLayerProperties QgsAnnotationLayer::properties() const
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  // annotation layers are always editable
  return Qgis::MapLayerProperty::UsersCannotToggleEditing;
}
 
QgsAnnotationLayer *QgsAnnotationLayer::clone() const
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  const QgsAnnotationLayer::LayerOptions options( mTransformContext );
  auto layer = std::make_unique< QgsAnnotationLayer >( name(), options );
  QgsMapLayer::clone( layer.get() );
 
  for ( auto it = mItems.constBegin(); it != mItems.constEnd(); ++it )
  {
    layer->mItems.insert( it.key(), ( *it )->clone() );
    if ( ( *it )->flags() & Qgis::AnnotationItemFlag::ScaleDependentBoundingBox )
      layer->mNonIndexedItems.insert( it.key() );
    else
      layer->mSpatialIndex->insert( it.key(), ( *it )->boundingBox() );
  }
 
  if ( mPaintEffect )
    layer->setPaintEffect( mPaintEffect->clone() );
 
  layer->mLinkedLayer = mLinkedLayer;
 
  return layer.release();
}
 
QgsMapLayerRenderer *QgsAnnotationLayer::createMapRenderer( QgsRenderContext &rendererContext )
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  return new QgsAnnotationLayerRenderer( this, rendererContext );
}
 
QgsRectangle QgsAnnotationLayer::extent() const
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  QgsRectangle rect;
  for ( auto it = mItems.constBegin(); it != mItems.constEnd(); ++it )
  {
    if ( rect.isNull() )
    {
      rect = it.value()->boundingBox();
    }
    else
    {
      rect.combineExtentWith( it.value()->boundingBox() );
    }
  }
  return rect;
}
 
void QgsAnnotationLayer::setTransformContext( const QgsCoordinateTransformContext &context )
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  if ( mDataProvider )
    mDataProvider->setTransformContext( context );
 
  mTransformContext = context;
  invalidateWgs84Extent();
}
 
bool QgsAnnotationLayer::readXml( const QDomNode &layerNode, QgsReadWriteContext &context )
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  if ( mReadFlags & QgsMapLayer::FlagDontResolveLayers )
  {
    return false;
  }
 
  QString errorMsg;
  readItems( layerNode, errorMsg, context );
  readSymbology( layerNode, errorMsg, context );
 
  {
    const QString layerId = layerNode.toElement().attribute( u"linkedLayer"_s );
    const QString layerName = layerNode.toElement().attribute( u"linkedLayerName"_s );
    const QString layerSource = layerNode.toElement().attribute( u"linkedLayerSource"_s );
    const QString layerProvider = layerNode.toElement().attribute( u"linkedLayerProvider"_s );
    mLinkedLayer = QgsMapLayerRef( layerId, layerName, layerSource, layerProvider );
  }
 
  triggerRepaint();
 
  return mValid;
}
 
bool QgsAnnotationLayer::writeXml( QDomNode &layer_node, QDomDocument &doc, const QgsReadWriteContext &context ) const
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  // first get the layer element so that we can append the type attribute
  QDomElement mapLayerNode = layer_node.toElement();
 
  if ( mapLayerNode.isNull() )
  {
    QgsDebugMsgLevel( u"can't find maplayer node"_s, 2 );
    return false;
  }
 
  mapLayerNode.setAttribute( u"type"_s, QgsMapLayerFactory::typeToString( Qgis::LayerType::Annotation ) );
 
  if ( mLinkedLayer )
  {
    mapLayerNode.setAttribute( u"linkedLayer"_s, mLinkedLayer.layerId );
    mapLayerNode.setAttribute( u"linkedLayerName"_s, mLinkedLayer.name );
    mapLayerNode.setAttribute( u"linkedLayerSource"_s, mLinkedLayer.source );
    mapLayerNode.setAttribute( u"linkedLayerProvider"_s, mLinkedLayer.provider );
  }
 
  QString errorMsg;
  writeItems( layer_node, doc, errorMsg, context );
 
  // renderer specific settings
  return writeSymbology( layer_node, doc, errorMsg, context );
}
 
bool QgsAnnotationLayer::writeSymbology( QDomNode &node, QDomDocument &doc, QString &, const QgsReadWriteContext &context, QgsMapLayer::StyleCategories categories ) const
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  QDomElement layerElement = node.toElement();
  writeCommonStyle( layerElement, doc, context, categories );
 
  // add the layer opacity
  if ( categories.testFlag( Rendering ) )
  {
    QDomElement layerOpacityElem = doc.createElement( u"layerOpacity"_s );
    const QDomText layerOpacityText = doc.createTextNode( QString::number( opacity() ) );
    layerOpacityElem.appendChild( layerOpacityText );
    node.appendChild( layerOpacityElem );
  }
 
  if ( categories.testFlag( Symbology ) )
  {
    // add the blend mode field
    QDomElement blendModeElem = doc.createElement( u"blendMode"_s );
    const QDomText blendModeText = doc.createTextNode( QString::number( static_cast< int >( QgsPainting::getBlendModeEnum( blendMode() ) ) ) );
    blendModeElem.appendChild( blendModeText );
    node.appendChild( blendModeElem );
 
    QDomElement paintEffectElem = doc.createElement( u"paintEffect"_s );
    if ( mPaintEffect && !QgsPaintEffectRegistry::isDefaultStack( mPaintEffect.get() ) )
      mPaintEffect->saveProperties( doc, paintEffectElem );
    node.appendChild( paintEffectElem );
  }
 
  return true;
}
 
bool QgsAnnotationLayer::readSymbology( const QDomNode &node, QString &, QgsReadWriteContext &context, QgsMapLayer::StyleCategories categories )
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  const QDomElement layerElement = node.toElement();
  readCommonStyle( layerElement, context, categories );
 
  if ( categories.testFlag( Rendering ) )
  {
    const QDomNode layerOpacityNode = node.namedItem( u"layerOpacity"_s );
    if ( !layerOpacityNode.isNull() )
    {
      const QDomElement e = layerOpacityNode.toElement();
      setOpacity( e.text().toDouble() );
    }
  }
 
  if ( categories.testFlag( Symbology ) )
  {
    // get and set the blend mode if it exists
    const QDomNode blendModeNode = node.namedItem( u"blendMode"_s );
    if ( !blendModeNode.isNull() )
    {
      const QDomElement e = blendModeNode.toElement();
      setBlendMode( QgsPainting::getCompositionMode( static_cast< Qgis::BlendMode >( e.text().toInt() ) ) );
    }
 
    //restore layer effect
    const QDomNode paintEffectNode = node.namedItem( u"paintEffect"_s );
    if ( !paintEffectNode.isNull() )
    {
      const QDomElement effectElem = paintEffectNode.firstChildElement( u"effect"_s );
      if ( !effectElem.isNull() )
      {
        setPaintEffect( QgsApplication::paintEffectRegistry()->createEffect( effectElem ) );
      }
    }
  }
 
  return true;
}
 
bool QgsAnnotationLayer::writeItems( QDomNode &node, QDomDocument &doc, QString &, const QgsReadWriteContext &context, QgsMapLayer::StyleCategories ) const
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  QDomElement itemsElement = doc.createElement( u"items"_s );
 
  for ( auto it = mItems.constBegin(); it != mItems.constEnd(); ++it )
  {
    QDomElement itemElement = doc.createElement( u"item"_s );
    itemElement.setAttribute( u"type"_s, ( *it )->type() );
    itemElement.setAttribute( u"id"_s, it.key() );
    ( *it )->writeXml( itemElement, doc, context );
    itemsElement.appendChild( itemElement );
  }
  node.appendChild( itemsElement );
 
  return true;
}
 
bool QgsAnnotationLayer::readItems( const QDomNode &node, QString &, QgsReadWriteContext &context, QgsMapLayer::StyleCategories )
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  qDeleteAll( mItems );
  mItems.clear();
  mSpatialIndex = std::make_unique< QgsAnnotationLayerSpatialIndex >();
  mNonIndexedItems.clear();
 
  const QDomNodeList itemsElements = node.toElement().elementsByTagName( u"items"_s );
  if ( itemsElements.size() == 0 )
    return false;
 
  const QDomNodeList items = itemsElements.at( 0 ).childNodes();
  for ( int i = 0; i < items.size(); ++i )
  {
    const QDomElement itemElement = items.at( i ).toElement();
    const QString id = itemElement.attribute( u"id"_s );
    const QString type = itemElement.attribute( u"type"_s );
    std::unique_ptr< QgsAnnotationItem > item( QgsApplication::annotationItemRegistry()->createItem( type ) );
    if ( item )
    {
      item->readXml( itemElement, context );
      if ( item->flags() & Qgis::AnnotationItemFlag::ScaleDependentBoundingBox )
        mNonIndexedItems.insert( id );
      else
        mSpatialIndex->insert( id, item->boundingBox() );
      mItems.insert( id, item.release() );
    }
  }
 
  return true;
}
 
bool QgsAnnotationLayer::writeStyle( QDomNode &node, QDomDocument &doc, QString &errorMessage, const QgsReadWriteContext &context, QgsMapLayer::StyleCategories categories ) const
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  writeItems( node, doc, errorMessage, context, categories );
 
  return writeSymbology( node, doc, errorMessage, context, categories );
}
 
bool QgsAnnotationLayer::readStyle( const QDomNode &node, QString &errorMessage, QgsReadWriteContext &context, QgsMapLayer::StyleCategories categories )
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  readItems( node, errorMessage, context, categories );
 
  return readSymbology( node, errorMessage, context, categories );
}
 
bool QgsAnnotationLayer::isEditable() const
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  // annotation layers are always editable
  return true;
}
 
bool QgsAnnotationLayer::supportsEditing() const
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  return true;
}
 
QgsDataProvider *QgsAnnotationLayer::dataProvider()
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  return mDataProvider.get();
}
 
const QgsDataProvider *QgsAnnotationLayer::dataProvider() const
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  return mDataProvider.get();
}
 
QString QgsAnnotationLayer::htmlMetadata() const
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  QString metadata = u"<html>\n<body>\n<h1>"_s + tr( "General" ) + u"</h1>\n<hr>\n"_s + u"<table class=\"list-view\">\n"_s;
 
  metadata += u"<tr><td class=\"highlight\">"_s + tr( "Name" ) + u"</td><td>"_s + name() + u"</td></tr>\n"_s;
 
  // Extent
  metadata += u"<tr><td class=\"highlight\">"_s + tr( "Extent" ) + u"</td><td>"_s + extent().toString() + u"</td></tr>\n"_s;
 
  // item count
  QLocale locale = QLocale();
  locale.setNumberOptions( locale.numberOptions() &= ~QLocale::NumberOption::OmitGroupSeparator );
  const int itemCount = mItems.size();
  metadata += u"<tr><td class=\"highlight\">"_s + tr( "Item count" ) + u"</td><td>"_s + locale.toString( static_cast<qlonglong>( itemCount ) ) + u"</td></tr>\n"_s;
  metadata += "</table>\n<br><br>"_L1;
 
  // CRS
  metadata += crsHtmlMetadata();
 
  // items section
  metadata += u"<h1>"_s + tr( "Items" ) + u"</h1>\n<hr>\n"_s;
 
  metadata += "<table width=\"100%\" class=\"tabular-view\">\n"_L1;
  metadata += "<tr><th>"_L1 + tr( "Type" ) + "</th><th>"_L1 + tr( "Count" ) + "</th></tr>\n"_L1;
 
  QMap< QString, int > itemCounts;
  for ( auto it = mItems.constBegin(); it != mItems.constEnd(); ++it )
  {
    itemCounts[it.value()->type()]++;
  }
 
  const QMap<QString, QString> itemTypes = QgsApplication::annotationItemRegistry()->itemTypes();
  int i = 0;
  for ( auto it = itemTypes.begin(); it != itemTypes.end(); ++it )
  {
    QString rowClass;
    if ( i % 2 )
      rowClass = u"class=\"odd-row\""_s;
    metadata += "<tr "_L1 + rowClass + "><td>"_L1 + it.value() + "</td><td>"_L1 + locale.toString( static_cast<qlonglong>( itemCounts.value( it.key() ) ) ) + "</td></tr>\n"_L1;
    i++;
  }
 
  metadata += "</table>\n<br><br>"_L1;
 
  metadata += "\n</body>\n</html>\n"_L1;
  return metadata;
}
 
void QgsAnnotationLayer::resolveReferences( QgsProject *project )
{
  mLinkedLayer.resolve( project );
}
 
QgsPaintEffect *QgsAnnotationLayer::paintEffect() const
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  return mPaintEffect.get();
}
 
void QgsAnnotationLayer::setPaintEffect( QgsPaintEffect *effect )
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  mPaintEffect.reset( effect );
}
 
QgsMapLayer *QgsAnnotationLayer::linkedVisibilityLayer()
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  return mLinkedLayer.get();
}
 
void QgsAnnotationLayer::setLinkedVisibilityLayer( QgsMapLayer *layer )
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  mLinkedLayer.setLayer( layer );
  triggerRepaint();
}
 
 
//
// QgsAnnotationLayerDataProvider
//
QgsAnnotationLayerDataProvider::QgsAnnotationLayerDataProvider( const ProviderOptions &options, Qgis::DataProviderReadFlags flags )
  : QgsDataProvider( QString(), options, flags )
{}
 
QgsCoordinateReferenceSystem QgsAnnotationLayerDataProvider::crs() const
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  return QgsCoordinateReferenceSystem();
}
 
QString QgsAnnotationLayerDataProvider::name() const
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  return u"annotation"_s;
}
 
QString QgsAnnotationLayerDataProvider::description() const
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  return QString();
}
 
QgsRectangle QgsAnnotationLayerDataProvider::extent() const
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  return QgsRectangle();
}
 
bool QgsAnnotationLayerDataProvider::isValid() const
{
  QGIS_PROTECT_QOBJECT_THREAD_ACCESS
 
  return true;
}