qgsvectorlayerundocommand.cpp

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/***************************************************************************
    qgsvectorlayerundocommand.cpp
    ---------------------
    begin                : June 2009
    copyright            : (C) 2009 by Martin Dobias
    email                : wonder dot sk at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#include "qgsvectorlayerundocommand.h"
 
#include "qgsfeature.h"
#include "qgsfeatureiterator.h"
#include "qgsgeometry.h"
#include "qgslogger.h"
#include "qgsvectorlayer.h"
#include "qgsvectorlayereditbuffer.h"
 
QgsVectorLayerUndoCommandAddFeature::QgsVectorLayerUndoCommandAddFeature( QgsVectorLayerEditBuffer *buffer, QgsFeature &f )
  : QgsVectorLayerUndoCommand( buffer )
{
  static int sAddedIdLowWaterMark = -1;
 
  //assign a temporary id to the feature (use negative numbers)
  sAddedIdLowWaterMark--;
 
  QgsDebugMsgLevel( "Assigned feature id " + QString::number( sAddedIdLowWaterMark ), 4 );
 
  // Force a feature ID (to keep other functions in QGIS happy,
  // providers will use their own new feature ID when we commit the new feature)
  // and add to the known added features.
  f.setId( sAddedIdLowWaterMark );
 
  mFeature = f;
}
 
void QgsVectorLayerUndoCommandAddFeature::undo()
{
#ifndef QT_NO_DEBUG
  const QgsFeatureMap::const_iterator it = mBuffer->mAddedFeatures.constFind( mFeature.id() );
  Q_ASSERT( it != mBuffer->mAddedFeatures.constEnd() );
#endif
  mBuffer->mAddedFeatures.remove( mFeature.id() );
 
  emit mBuffer->featureDeleted( mFeature.id() );
}
 
void QgsVectorLayerUndoCommandAddFeature::redo()
{
  mBuffer->mAddedFeatures.insert( mFeature.id(), mFeature );
 
  emit mBuffer->featureAdded( mFeature.id() );
}
 
 
QgsVectorLayerUndoCommandDeleteFeature::QgsVectorLayerUndoCommandDeleteFeature( QgsVectorLayerEditBuffer *buffer, QgsFeatureId fid )
  : QgsVectorLayerUndoCommand( buffer )
{
  mFid = fid;
 
  if ( FID_IS_NEW( mFid ) )
  {
    const QgsFeatureMap::const_iterator it = mBuffer->mAddedFeatures.constFind( mFid );
    Q_ASSERT( it != mBuffer->mAddedFeatures.constEnd() );
    mOldAddedFeature = it.value();
  }
}
 
void QgsVectorLayerUndoCommandDeleteFeature::undo()
{
  if ( FID_IS_NEW( mFid ) )
  {
    mBuffer->mAddedFeatures.insert( mOldAddedFeature.id(), mOldAddedFeature );
  }
  else
  {
    mBuffer->mDeletedFeatureIds.remove( mFid );
  }
 
  emit mBuffer->featureAdded( mFid );
}
 
void QgsVectorLayerUndoCommandDeleteFeature::redo()
{
  if ( FID_IS_NEW( mFid ) )
  {
    mBuffer->mAddedFeatures.remove( mFid );
  }
  else
  {
    mBuffer->mDeletedFeatureIds.insert( mFid );
  }
 
  emit mBuffer->featureDeleted( mFid );
}
 
 
QgsVectorLayerUndoCommandChangeGeometry::QgsVectorLayerUndoCommandChangeGeometry( QgsVectorLayerEditBuffer *buffer, QgsFeatureId fid, const QgsGeometry &newGeom )
  : QgsVectorLayerUndoCommand( buffer )
  , mFid( fid )
  , mNewGeom( newGeom )
{
  if ( FID_IS_NEW( mFid ) )
  {
    const QgsFeatureMap::const_iterator it = mBuffer->mAddedFeatures.constFind( mFid );
    Q_ASSERT( it != mBuffer->mAddedFeatures.constEnd() );
    mOldGeom = ( it.value().geometry() );
  }
  else
  {
    mOldGeom = mBuffer->mChangedGeometries.value( mFid, QgsGeometry() );
  }
}
 
 
bool QgsVectorLayerUndoCommandChangeGeometry::mergeWith( const QUndoCommand *other )
{
  if ( other->id() != id() )
    return false;
 
  const QgsVectorLayerUndoCommandChangeGeometry *merge = dynamic_cast<const QgsVectorLayerUndoCommandChangeGeometry *>( other );
  if ( !merge )
    return false;
 
  if ( merge->mFid != mFid )
    return false;
 
  mNewGeom = merge->mNewGeom;
  merge->mNewGeom = QgsGeometry();
 
  return true;
}
 
void QgsVectorLayerUndoCommandChangeGeometry::undo()
{
  if ( FID_IS_NEW( mFid ) )
  {
    // modify added features
    const QgsFeatureMap::iterator it = mBuffer->mAddedFeatures.find( mFid );
    Q_ASSERT( it != mBuffer->mAddedFeatures.end() );
    it.value().setGeometry( mOldGeom );
 
    emit mBuffer->geometryChanged( mFid, mOldGeom );
  }
  else
  {
    // existing feature
 
    if ( mOldGeom.isNull() )
    {
      mBuffer->mChangedGeometries.remove( mFid );
 
      QgsFeature f;
      if ( layer()->getFeatures( QgsFeatureRequest().setFilterFid( mFid ).setNoAttributes() ).nextFeature( f ) && f.hasGeometry() )
      {
        emit mBuffer->geometryChanged( mFid, f.geometry() );
      }
    }
    else
    {
      mBuffer->mChangedGeometries[mFid] = mOldGeom;
      emit mBuffer->geometryChanged( mFid, mOldGeom );
    }
  }
}
 
void QgsVectorLayerUndoCommandChangeGeometry::redo()
{
  if ( FID_IS_NEW( mFid ) )
  {
    // modify added features
    const QgsFeatureMap::iterator it = mBuffer->mAddedFeatures.find( mFid );
    Q_ASSERT( it != mBuffer->mAddedFeatures.end() );
    it.value().setGeometry( mNewGeom );
  }
  else
  {
    mBuffer->mChangedGeometries[mFid] = mNewGeom;
  }
  emit mBuffer->geometryChanged( mFid, mNewGeom );
}
 
 
QgsVectorLayerUndoCommandChangeAttribute::QgsVectorLayerUndoCommandChangeAttribute( QgsVectorLayerEditBuffer *buffer, QgsFeatureId fid, int fieldIndex, const QVariant &newValue, const QVariant &oldValue )
  : QgsVectorLayerUndoCommand( buffer )
  , mFid( fid )
  , mFieldIndex( fieldIndex )
  , mOldValue( oldValue )
  , mNewValue( newValue )
{
  if ( FID_IS_NEW( mFid ) )
  {
    // work with added feature
    const QgsFeatureMap::const_iterator it = mBuffer->mAddedFeatures.constFind( mFid );
    if ( it != mBuffer->mAddedFeatures.constEnd() )
    {
      if ( it.value().attribute( mFieldIndex ).isValid() )
      {
        mOldValue = it.value().attribute( mFieldIndex );
        mFirstChange = false;
      }
    }
    else
    {
      // TODO: report a programmatic error ?
    }
  }
  else
  {
    // work with existing feature
    const QgsChangedAttributesMap::const_iterator it = mBuffer->mChangedAttributeValues.constFind( mFid );
    if ( it != mBuffer->mChangedAttributeValues.constEnd() )
    {
      if ( it->contains( mFieldIndex ) )
      {
        mOldValue = mBuffer->mChangedAttributeValues[mFid][mFieldIndex];
        mFirstChange = false;
      }
    }
    else
    {
      // TODO: report a programmatic error ?
    }
  }
}
 
void QgsVectorLayerUndoCommandChangeAttribute::undo()
{
  QVariant original = mOldValue;
 
  if ( FID_IS_NEW( mFid ) )
  {
    // added feature
    const QgsFeatureMap::iterator it = mBuffer->mAddedFeatures.find( mFid );
    if ( it == mBuffer->mAddedFeatures.end() )
    {
      // the feature must have been removed, nothing to undo here
      // See https://github.com/qgis/QGIS/issues/23243
    }
    else
    {
      //Q_ASSERT( it != mBuffer->mAddedFeatures.end() );
      it.value().setAttribute( mFieldIndex, mOldValue );
    }
  }
  else if ( mFirstChange )
  {
    // existing feature
    mBuffer->mChangedAttributeValues[mFid].remove( mFieldIndex );
    if ( mBuffer->mChangedAttributeValues[mFid].isEmpty() )
      mBuffer->mChangedAttributeValues.remove( mFid );
 
    if ( !mOldValue.isValid() )
    {
      // get old value from provider
      QgsFeature tmp;
      QgsFeatureRequest request;
      request.setFilterFid( mFid );
      request.setFlags( Qgis::FeatureRequestFlag::NoGeometry );
      request.setSubsetOfAttributes( QgsAttributeList() << mFieldIndex );
      QgsFeatureIterator fi = layer()->getFeatures( request );
      if ( fi.nextFeature( tmp ) )
        original = tmp.attribute( mFieldIndex );
    }
  }
  else
  {
    mBuffer->mChangedAttributeValues[mFid][mFieldIndex] = mOldValue;
  }
 
  emit mBuffer->attributeValueChanged( mFid, mFieldIndex, original );
}
 
void QgsVectorLayerUndoCommandChangeAttribute::redo()
{
  if ( FID_IS_NEW( mFid ) )
  {
    // updated added feature
    const QgsFeatureMap::iterator it = mBuffer->mAddedFeatures.find( mFid );
    Q_ASSERT( it != mBuffer->mAddedFeatures.end() );
    it.value().setAttribute( mFieldIndex, mNewValue );
  }
  else
  {
    // changed attribute of existing feature
    if ( !mBuffer->mChangedAttributeValues.contains( mFid ) )
    {
      mBuffer->mChangedAttributeValues.insert( mFid, QgsAttributeMap() );
    }
 
    mBuffer->mChangedAttributeValues[mFid].insert( mFieldIndex, mNewValue );
  }
 
  emit mBuffer->attributeValueChanged( mFid, mFieldIndex, mNewValue );
}
 
 
QgsVectorLayerUndoCommandAddAttribute::QgsVectorLayerUndoCommandAddAttribute( QgsVectorLayerEditBuffer *buffer, const QgsField &field )
  : QgsVectorLayerUndoCommand( buffer )
  , mField( field )
{
  const QgsFields &fields = layer()->fields();
  int i;
  for ( i = 0; i < fields.count() && fields.fieldOrigin( i ) != Qgis::FieldOrigin::Join; i++ )
    ;
  mFieldIndex = i;
}
 
void QgsVectorLayerUndoCommandAddAttribute::undo()
{
  const int index = layer()->fields().fieldOriginIndex( mFieldIndex );
 
  mBuffer->mAddedAttributes.removeAt( index );
  mBuffer->handleAttributeDeleted( mFieldIndex );
  mBuffer->updateLayerFields();
 
  emit mBuffer->attributeDeleted( mFieldIndex );
}
 
void QgsVectorLayerUndoCommandAddAttribute::redo()
{
  mBuffer->mAddedAttributes.append( mField );
  mBuffer->handleAttributeAdded( mFieldIndex, mField );
  mBuffer->updateLayerFields();
 
  emit mBuffer->attributeAdded( mFieldIndex );
}
 
 
QgsVectorLayerUndoCommandDeleteAttribute::QgsVectorLayerUndoCommandDeleteAttribute( QgsVectorLayerEditBuffer *buffer, int fieldIndex )
  : QgsVectorLayerUndoCommand( buffer )
  , mFieldIndex( fieldIndex )
{
  const QgsFields &fields = layer()->fields();
  const Qgis::FieldOrigin origin = fields.fieldOrigin( mFieldIndex );
  mOriginIndex = fields.fieldOriginIndex( mFieldIndex );
  mProviderField = ( origin == Qgis::FieldOrigin::Provider );
  mFieldName = fields.field( mFieldIndex ).name();
 
  if ( !mProviderField )
  {
    // need to store the field definition
    mOldField = mBuffer->mAddedAttributes[mOriginIndex];
  }
 
  if ( mBuffer->mRenamedAttributes.contains( fieldIndex ) )
  {
    mOldName = mBuffer->mRenamedAttributes.value( fieldIndex );
  }
 
  // save values of new features
  for ( QgsFeatureMap::const_iterator it = mBuffer->mAddedFeatures.constBegin(); it != mBuffer->mAddedFeatures.constEnd(); ++it )
  {
    const QgsFeature &f = it.value();
    mDeletedValues.insert( f.id(), f.attribute( mFieldIndex ) );
  }
 
  // save changed values
  for ( QgsChangedAttributesMap::const_iterator it = mBuffer->mChangedAttributeValues.constBegin(); it != mBuffer->mChangedAttributeValues.constEnd(); ++it )
  {
    const QgsAttributeMap &attrs = it.value();
    if ( attrs.contains( mFieldIndex ) )
      mDeletedValues.insert( it.key(), attrs[mFieldIndex] );
  }
}
 
void QgsVectorLayerUndoCommandDeleteAttribute::undo()
{
  if ( mProviderField )
  {
    mBuffer->mDeletedAttributeIds.removeOne( mOriginIndex );
  }
  else
  {
    // newly added attribute
    mBuffer->mAddedAttributes.insert( mOriginIndex, mOldField );
  }
 
  mBuffer->updateLayerFields();
  mBuffer->handleAttributeAdded( mFieldIndex, mOldField ); // update changed attributes + new features
 
  if ( !mOldName.isEmpty() )
  {
    mBuffer->mRenamedAttributes[mFieldIndex] = mOldName;
    mBuffer->updateLayerFields();
  }
 
  // set previously used attributes of new features
  for ( QgsFeatureMap::iterator it = mBuffer->mAddedFeatures.begin(); it != mBuffer->mAddedFeatures.end(); ++it )
  {
    QgsFeature &f = it.value();
    f.setAttribute( mFieldIndex, mDeletedValues.value( f.id() ) );
  }
  // set previously used changed attributes
  for ( QMap<QgsFeatureId, QVariant>::const_iterator it = mDeletedValues.constBegin(); it != mDeletedValues.constEnd(); ++it )
  {
    if ( !FID_IS_NEW( it.key() ) )
    {
      QgsAttributeMap &attrs = mBuffer->mChangedAttributeValues[it.key()]; // also adds record if nonexistent
      attrs.insert( mFieldIndex, it.value() );
    }
  }
 
  const QgsEditFormConfig formConfig = mBuffer->L->editFormConfig();
  mBuffer->L->setEditFormConfig( formConfig );
 
  emit mBuffer->attributeAdded( mFieldIndex );
}
 
void QgsVectorLayerUndoCommandDeleteAttribute::redo()
{
  if ( mProviderField )
  {
    mBuffer->mDeletedAttributeIds.append( mOriginIndex );
    std::sort( mBuffer->mDeletedAttributeIds.begin(), mBuffer->mDeletedAttributeIds.end() ); // keep it sorted
  }
  else
  {
    // newly added attribute
    mBuffer->mAddedAttributes.removeAt( mOriginIndex ); // removing temporary attribute
  }
 
  mBuffer->handleAttributeDeleted( mFieldIndex ); // update changed attributes + new features
  mBuffer->updateLayerFields();
  emit mBuffer->attributeDeleted( mFieldIndex );
}
 
 
QgsVectorLayerUndoCommandRenameAttribute::QgsVectorLayerUndoCommandRenameAttribute( QgsVectorLayerEditBuffer *buffer, int fieldIndex, const QString &newName )
  : QgsVectorLayerUndoCommand( buffer )
  , mFieldIndex( fieldIndex )
  , mOldName( layer()->fields().at( fieldIndex ).name() )
  , mNewName( newName )
{
  const QgsFields &fields = layer()->fields();
  const Qgis::FieldOrigin origin = fields.fieldOrigin( mFieldIndex );
  mOriginIndex = fields.fieldOriginIndex( mFieldIndex );
  mProviderField = ( origin == Qgis::FieldOrigin::Provider );
}
 
void QgsVectorLayerUndoCommandRenameAttribute::undo()
{
  if ( mProviderField )
  {
    mBuffer->mRenamedAttributes[mFieldIndex] = mOldName;
  }
  else
  {
    // newly added attribute
    mBuffer->mAddedAttributes[mOriginIndex].setName( mOldName );
  }
  mBuffer->updateLayerFields();
  emit mBuffer->attributeRenamed( mFieldIndex, mOldName );
}
 
void QgsVectorLayerUndoCommandRenameAttribute::redo()
{
  if ( mProviderField )
  {
    mBuffer->mRenamedAttributes[mFieldIndex] = mNewName;
  }
  else
  {
    // newly added attribute
    mBuffer->mAddedAttributes[mOriginIndex].setName( mNewName );
  }
  mBuffer->updateLayerFields();
  emit mBuffer->attributeRenamed( mFieldIndex, mNewName );
}