qgsabstractreportsection.cpp

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/***************************************************************************
                             qgsabstractreportsection.cpp
                             --------------------
    begin                : December 2017
    copyright            : (C) 2017 by Nyall Dawson
    email                : nyall dot dawson at gmail dot com
 ***************************************************************************/
/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#include "qgsabstractreportsection.h"
#include "qgslayout.h"
#include "qgsreport.h"
#include "qgsreportsectionfieldgroup.h"
#include "qgsreportsectionlayout.h"
#include "qgsvectorlayer.h"
#include "qgsstyleentityvisitor.h"
 
 
QgsAbstractReportSection::QgsAbstractReportSection( QgsAbstractReportSection *parent )
  : mParent( parent )
{}
 
QgsAbstractReportSection::~QgsAbstractReportSection()
{
  qDeleteAll( mChildren );
}
 
QgsProject *QgsAbstractReportSection::project()
{
  if ( QgsReport *report = dynamic_cast< QgsReport * >( this ) )
    return report->layoutProject();
 
  QgsAbstractReportSection *current = this;
  while ( QgsAbstractReportSection *parent = current->parentSection() )
  {
    if ( QgsReport *report = dynamic_cast< QgsReport * >( parent ) )
      return report->layoutProject();
 
    current = parent;
  }
  return nullptr;
}
 
void QgsAbstractReportSection::setContext( const QgsReportSectionContext &context )
{
  auto setReportContext = [&context]( QgsLayout * layout )
  {
    if ( context.currentLayer )
    {
      layout->reportContext().blockSignals( true );
      layout->reportContext().setLayer( context.currentLayer );
      layout->reportContext().blockSignals( false );
    }
    layout->reportContext().setFeature( context.feature );
  };
 
  mContext = context;
  if ( mHeader )
    setReportContext( mHeader.get() );
  if ( mFooter )
    setReportContext( mFooter.get() );
 
  for ( QgsAbstractReportSection *section : std::as_const( mChildren ) )
  {
    section->setContext( mContext );
  }
}
 
bool QgsAbstractReportSection::writeXml( QDomElement &parentElement, QDomDocument &doc, const QgsReadWriteContext &context ) const
{
  QDomElement element = doc.createElement( QStringLiteral( "Section" ) );
  element.setAttribute( QStringLiteral( "type" ), type() );
 
  element.setAttribute( QStringLiteral( "headerEnabled" ), mHeaderEnabled ? QStringLiteral( "1" ) : QStringLiteral( "0" ) );
  if ( mHeader )
  {
    QDomElement headerElement = doc.createElement( QStringLiteral( "header" ) );
    headerElement.appendChild( mHeader->writeXml( doc, context ) );
    element.appendChild( headerElement );
  }
  element.setAttribute( QStringLiteral( "footerEnabled" ), mFooterEnabled ? QStringLiteral( "1" ) : QStringLiteral( "0" ) );
  if ( mFooter )
  {
    QDomElement footerElement = doc.createElement( QStringLiteral( "footer" ) );
    footerElement.appendChild( mFooter->writeXml( doc, context ) );
    element.appendChild( footerElement );
  }
 
  for ( QgsAbstractReportSection *section : mChildren )
  {
    section->writeXml( element, doc, context );
  }
 
  writePropertiesToElement( element, doc, context );
 
  parentElement.appendChild( element );
  return true;
}
 
bool QgsAbstractReportSection::readXml( const QDomElement &element, const QDomDocument &doc, const QgsReadWriteContext &context )
{
  if ( element.nodeName() != QLatin1String( "Section" ) )
  {
    return false;
  }
 
  mHeaderEnabled = element.attribute( QStringLiteral( "headerEnabled" ), QStringLiteral( "0" ) ).toInt();
  mFooterEnabled = element.attribute( QStringLiteral( "footerEnabled" ), QStringLiteral( "0" ) ).toInt();
  const QDomElement headerElement = element.firstChildElement( QStringLiteral( "header" ) );
  if ( !headerElement.isNull() )
  {
    const QDomElement headerLayoutElem = headerElement.firstChild().toElement();
    std::unique_ptr< QgsLayout > header = std::make_unique< QgsLayout >( project() );
    header->readXml( headerLayoutElem, doc, context );
    mHeader = std::move( header );
  }
  const QDomElement footerElement = element.firstChildElement( QStringLiteral( "footer" ) );
  if ( !footerElement.isNull() )
  {
    const QDomElement footerLayoutElem = footerElement.firstChild().toElement();
    std::unique_ptr< QgsLayout > footer = std::make_unique< QgsLayout >( project() );
    footer->readXml( footerLayoutElem, doc, context );
    mFooter = std::move( footer );
  }
 
  const QDomNodeList sectionItemList = element.childNodes();
  for ( int i = 0; i < sectionItemList.size(); ++i )
  {
    const QDomElement currentSectionElem = sectionItemList.at( i ).toElement();
    if ( currentSectionElem.nodeName() != QLatin1String( "Section" ) )
      continue;
 
    const QString sectionType = currentSectionElem.attribute( QStringLiteral( "type" ) );
 
    //TODO - eventually move this to a registry when there's enough subclasses to warrant it
    std::unique_ptr< QgsAbstractReportSection > section;
    if ( sectionType == QLatin1String( "SectionFieldGroup" ) )
    {
      section = std::make_unique< QgsReportSectionFieldGroup >();
    }
    else if ( sectionType == QLatin1String( "SectionLayout" ) )
    {
      section = std::make_unique< QgsReportSectionLayout >();
    }
 
    if ( section )
    {
      appendChild( section.get() );
      section->readXml( currentSectionElem, doc, context );
      ( void )section.release(); //ownership was transferred already
    }
  }
 
  bool result = readPropertiesFromElement( element, doc, context );
  return result;
}
 
void QgsAbstractReportSection::reloadSettings()
{
  if ( mHeader )
    mHeader->reloadSettings();
  if ( mFooter )
    mFooter->reloadSettings();
}
 
bool QgsAbstractReportSection::accept( QgsStyleEntityVisitorInterface *visitor ) const
{
  // NOTE: if visitEnter returns false it means "don't visit the report section", not "abort all further visitations"
  if ( mParent && !visitor->visitEnter( QgsStyleEntityVisitorInterface::Node( QgsStyleEntityVisitorInterface::NodeType::ReportSection, QStringLiteral( "reportsection" ), QObject::tr( "Report Section" ) ) ) )
    return true;
 
  if ( mHeader )
  {
    // NOTE: if visitEnter returns false it means "don't visit the header", not "abort all further visitations"
    if ( visitor->visitEnter( QgsStyleEntityVisitorInterface::Node( QgsStyleEntityVisitorInterface::NodeType::ReportHeader, QStringLiteral( "reportheader" ), QObject::tr( "Report Header" ) ) ) )
    {
      if ( !mHeader->accept( visitor ) )
        return false;
 
      if ( !visitor->visitExit( QgsStyleEntityVisitorInterface::Node( QgsStyleEntityVisitorInterface::NodeType::ReportHeader, QStringLiteral( "reportheader" ), QObject::tr( "Report Header" ) ) ) )
        return false;
    }
  }
 
  for ( const QgsAbstractReportSection *child : mChildren )
  {
    if ( !child->accept( visitor ) )
      return false;
  }
 
  if ( mFooter )
  {
    // NOTE: if visitEnter returns false it means "don't visit the footer", not "abort all further visitations"
    if ( visitor->visitEnter( QgsStyleEntityVisitorInterface::Node( QgsStyleEntityVisitorInterface::NodeType::ReportFooter, QStringLiteral( "reportfooter" ), QObject::tr( "Report Footer" ) ) ) )
    {
      if ( !mFooter->accept( visitor ) )
        return false;
 
      if ( !visitor->visitExit( QgsStyleEntityVisitorInterface::Node( QgsStyleEntityVisitorInterface::NodeType::ReportFooter, QStringLiteral( "reportfooter" ), QObject::tr( "Report Footer" ) ) ) )
        return false;
    }
  }
 
  if ( mParent && !visitor->visitExit( QgsStyleEntityVisitorInterface::Node( QgsStyleEntityVisitorInterface::NodeType::ReportSection, QStringLiteral( "reportsection" ), QObject::tr( "Report Section" ) ) ) )
    return false;
 
  return true;
}
 
QString QgsAbstractReportSection::filePath( const QString &baseFilePath, const QString &extension )
{
  QString base = QStringLiteral( "%1_%2" ).arg( baseFilePath ).arg( mSectionNumber, 4, 10, QChar( '0' ) );
  if ( !extension.startsWith( '.' ) )
    base += '.';
  base += extension;
  return base;
}
 
QgsLayout *QgsAbstractReportSection::layout()
{
  return mCurrentLayout;
}
 
bool QgsAbstractReportSection::beginRender()
{
  // reset this section
  reset();
  mSectionNumber = 0;
 
  // and all children too
  bool result = true;
  for ( QgsAbstractReportSection *child : std::as_const( mChildren ) )
  {
    result = result && child->beginRender();
  }
  return result;
}
 
bool QgsAbstractReportSection::next()
{
  mSectionNumber++;
 
  if ( mNextSection == Header )
  {
    // regardless of whether we have a header or not, the next section will be the body
    mNextSection = Body;
 
    // if we have a header, then the current section will be the header
    if ( mHeaderEnabled && mHeader )
    {
      if ( prepareHeader() )
      {
        mCurrentLayout = mHeader.get();
        return true;
      }
    }
 
    // but if not, then the current section is a body
    mNextSection = Body;
  }
 
  if ( mNextSection == Body )
  {
    mNextSection = Children;
 
    bool ok = false;
    // if we have a next body available, use it
    QgsLayout *body = nextBody( ok );
    if ( body )
    {
      mNextChild = 0;
      mCurrentLayout = body;
      return true;
    }
  }
 
  if ( mNextSection == Children )
  {
    bool bodiesAvailable = false;
    do
    {
      // we iterate through all the section's children...
      while ( mNextChild < mChildren.count() )
      {
        // ... staying on the current child only while it still has content for us
        if ( mChildren.at( mNextChild )->next() )
        {
          mCurrentLayout = mChildren.at( mNextChild )->layout();
          return true;
        }
        else
        {
          // no more content for this child, so move to next child
          mNextChild++;
        }
      }
 
      // used up all the children
      // if we have a next body available, use it
      QgsLayout *body = nextBody( bodiesAvailable );
      if ( bodiesAvailable )
      {
        mNextChild = 0;
 
        for ( QgsAbstractReportSection *section : std::as_const( mChildren ) )
        {
          section->reset();
        }
      }
      if ( body )
      {
        mCurrentLayout = body;
        return true;
      }
    }
    while ( bodiesAvailable );
 
    // all children and bodies have spent their content, so move to the footer
    mNextSection = Footer;
  }
 
  if ( mNextSection == Footer )
  {
    // regardless of whether we have a footer or not, this is the last section
    mNextSection = End;
 
    // if we have a footer, then the current section will be the footer
    if ( mFooterEnabled && mFooter )
    {
      if ( prepareFooter() )
      {
        mCurrentLayout = mFooter.get();
        return true;
      }
    }
 
    // if not, then we're all done
  }
 
  mCurrentLayout = nullptr;
  return false;
}
 
bool QgsAbstractReportSection::endRender()
{
  // reset this section
  reset();
 
  // and all children too
  bool result = true;
  for ( QgsAbstractReportSection *child : std::as_const( mChildren ) )
  {
    result = result && child->endRender();
  }
  return result;
}
 
void QgsAbstractReportSection::reset()
{
  mCurrentLayout = nullptr;
  mNextChild = 0;
  mNextSection = Header;
  for ( QgsAbstractReportSection *section : std::as_const( mChildren ) )
  {
    section->reset();
  }
}
 
bool QgsAbstractReportSection::prepareHeader()
{
  return true;
}
 
bool QgsAbstractReportSection::prepareFooter()
{
  return true;
}
 
void QgsAbstractReportSection::setHeader( QgsLayout *header )
{
  mHeader.reset( header );
}
 
void QgsAbstractReportSection::setFooter( QgsLayout *footer )
{
  mFooter.reset( footer );
}
 
int QgsAbstractReportSection::row() const
{
  if ( mParent )
    return mParent->childSections().indexOf( const_cast<QgsAbstractReportSection *>( this ) );
 
  return 0;
}
 
QgsAbstractReportSection *QgsAbstractReportSection::childSection( int index )
{
  return mChildren.value( index );
}
 
void QgsAbstractReportSection::appendChild( QgsAbstractReportSection *section )
{
  section->setParentSection( this );
  mChildren.append( section );
}
 
void QgsAbstractReportSection::insertChild( int index, QgsAbstractReportSection *section )
{
  section->setParentSection( this );
  index = std::max( 0, index );
  index = std::min( index, static_cast<int>( mChildren.count() ) );
  mChildren.insert( index, section );
}
 
void QgsAbstractReportSection::removeChild( QgsAbstractReportSection *section )
{
  mChildren.removeAll( section );
  delete section;
}
 
void QgsAbstractReportSection::removeChildAt( int index )
{
  if ( index < 0 || index >= mChildren.count() )
    return;
 
  QgsAbstractReportSection *section = mChildren.at( index );
  removeChild( section );
}
 
void QgsAbstractReportSection::copyCommonProperties( QgsAbstractReportSection *destination ) const
{
  destination->mHeaderEnabled = mHeaderEnabled;
  if ( mHeader )
    destination->mHeader.reset( mHeader->clone() );
  else
    destination->mHeader.reset();
 
  destination->mFooterEnabled = mFooterEnabled;
  if ( mFooter )
    destination->mFooter.reset( mFooter->clone() );
  else
    destination->mFooter.reset();
 
  qDeleteAll( destination->mChildren );
  destination->mChildren.clear();
 
  for ( QgsAbstractReportSection *child : std::as_const( mChildren ) )
  {
    destination->appendChild( child->clone() );
  }
}
 
bool QgsAbstractReportSection::writePropertiesToElement( QDomElement &, QDomDocument &, const QgsReadWriteContext & ) const
{
  return true;
}
 
bool QgsAbstractReportSection::readPropertiesFromElement( const QDomElement &, const QDomDocument &, const QgsReadWriteContext & )
{
  return true;
}