Control (View) with multiple parameters?

Developer VSTGUI
3

I am stuck on the same thing: a custom element that can control two parameters.

I derive a custom view class MyView from CView. In the construtor I pass a pointer to the VST3Editor:

class MyView : public CView
{
public:
     AAView (const CRect& size, Steinberg::Vst::EditController* listener = nullptr);
     // ...
private:
     Steinberg::Vst::EditController* editController;
     // ...
}

In the UiDescriptionEditor I place a CView and set the custom-view-name to “MyView”.
This triggers a call of Controller::createCustomView() and I can construct MyView:

VSTGUI::CView* Controller::createCustomView (UTF8StringPtr name,
                                              const UIAttributes& attributes,
                                               const IUIDescription* description,
                                               VST3Editor* editor)
{
     if (UTF8StringView (name) == "MyView")
    {
          myView = new MyView(CRect(), this);
          return myView;
    }
    return nullptr;
}

MyView can then inform the Editor about value changes for different parameters:

// in MyView::onMouseDown():
editController->beginEdit(tag);

// in MyView::onMouseMoved():
editController->performEdit (tag, value);
editController->setParamNormalized (tag, value);

// in MyView::onMouseUp:
editController->endEdit(tag);

Do I understand it right: performEdit() informs the host and setParamNormalized() updates the editor?

For the other way round (MyView receives parameter changes) I guess I have to add MyView as listener to the two parameters.
In the sdk I see only code that is related Parameter Listener with CControls.

How can this be done? Can someone point me to the right direction?