[Paraview] Forcing update on view

[Andrzej Peczak]

Hi, 

I have a snippet code which I wrote to allow me to save multiple plot images to files. I do it by changing property checkboxes of Composite Data Set Index property. I can change their status programmatically but the view is not being updated. When I change them manually in the UI the view knows about their status change and plots only the content I select. I tried to force the update with UpdateVTkObjects() of available properties plus explicitly calling render()/forceRender() of the view but with no success.  Every file I create has multiple plot curves in it instead of one.

Andrzej

	pqDataRepresentation *repr = source->getRepresentation( view );
	auto chartRepresentationProxy = repr->getProxy();
	vtkSMPropertyHelper helper( repr->getProxy(), "CompositeDataSetIndex" );

	vtkSMProperty *property = chartRepresentationProxy->GetProperty( "CompositeDataSetIndex" );
	if ( property ) {

		auto VectorProperty = vtkSMIntVectorProperty::SafeDownCast( property );
		if ( VectorProperty ) {

			const auto numElements = VectorProperty->GetNumberOfElements();
			int elements[ numElements ];
			std::copy( VectorProperty->GetElements(), VectorProperty->GetElements() + numElements, elements );
			for ( auto i = 0 ; i != numElements ; ++i ) {
				VectorProperty->SetElement( elements[ i ], 0 );
			}

			for ( auto i = 0 ; i != numElements ; ++i ) {
				VectorProperty->SetElement( elements[ i ], 1 );

				source->getSourceProxy()->UpdateVTKObjects();
				view->getViewProxy()->UpdateVTKObjects();
				view->getViewProxy()->Update();
				repr = source->getRepresentation( view );
				repr->getProxy()->UpdateVTKObjects();
				repr->renderView( true );
				property->GetParent()->UpdateVTKObjects();
				view->cancelPendingRenders();
				view->forceRender();

				std::stringstream ssFileName;
				std::string ext , newName2;
				std::string::size_type dot_pos = newName.rfind( '.' );
				if ( dot_pos != std::string::npos ) {
					ext = newName.substr( dot_pos );
					newName2 = newName.substr( 0, dot_pos );
				}
				ssFileName << newName2 << "_" << i + 1 << ext;
				view->writeImage( ssFileName.str().c_str(), size, quality );
				VectorProperty->SetElement( elements[ i ], 0 );
			}

			VectorProperty->SetElements( elements );
		}
	}

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