C++ (Cpp) QgsProject::title示例

QgsExpressionContextScope* QgsExpressionContextUtils::projectScope()
{
  QgsProject* project = QgsProject::instance();

  QgsExpressionContextScope* scope = new QgsExpressionContextScope( QObject::tr( "Project" ) );

  //add variables defined in project file
  QStringList variableNames = project->readListEntry( "Variables", "/variableNames" );
  QStringList variableValues = project->readListEntry( "Variables", "/variableValues" );

  int varIndex = 0;
  Q_FOREACH ( const QString& variableName, variableNames )
  {
    if ( varIndex >= variableValues.length() )
    {
      break;
    }

    QString varValueString = variableValues.at( varIndex );
    varIndex++;
    scope->setVariable( variableName, varValueString );
  }

  //add other known project variables
  scope->addVariable( QgsExpressionContextScope::StaticVariable( "project_title", project->title(), true ) );
  scope->addVariable( QgsExpressionContextScope::StaticVariable( "project_path", project->fileInfo().filePath(), true ) );
  scope->addVariable( QgsExpressionContextScope::StaticVariable( "project_folder", project->fileInfo().dir().path(), true ) );
  scope->addVariable( QgsExpressionContextScope::StaticVariable( "project_filename", project->fileInfo().fileName(), true ) );

  scope->addFunction( "project_color", new GetNamedProjectColor() );
  return scope;
}

示例#2

显示文件

文件： qgsexpressioncontext.cpp 项目： drnextgis/QGIS

QgsExpressionContextScope* QgsExpressionContextUtils::projectScope()
{
  QgsProject* project = QgsProject::instance();

  QgsExpressionContextScope* scope = new QgsExpressionContextScope( QObject::tr( "Project" ) );

  const QgsStringMap vars = QgsProject::instance()->variables();

  QgsStringMap::const_iterator it = vars.constBegin();

  for ( ; it != vars.constEnd(); ++it )
  {
    scope->setVariable( it.key(), it.value() );
  }

  //add other known project variables
  scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "project_title" ), project->title(), true ) );
  scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "project_path" ), project->fileInfo().filePath(), true ) );
  scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "project_folder" ), project->fileInfo().dir().path(), true ) );
  scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "project_filename" ), project->fileInfo().fileName(), true ) );
  QgsCoordinateReferenceSystem projectCrs = project->crs();
  scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "project_crs" ), projectCrs.authid(), true ) );
  scope->addVariable( QgsExpressionContextScope::StaticVariable( QStringLiteral( "project_crs_definition" ), projectCrs.toProj4(), true ) );

  scope->addFunction( QStringLiteral( "project_color" ), new GetNamedProjectColor() );
  return scope;
}