Why is RenderWindow::GetDefaultView () const in SFML2?

[MickeyKnox]

I have the following Code snippet:

Code: [Select]

       case sf::Event::Resized:
            {
                window->GetDefaultView ().SetSize (event.Size.Width, event.Size.Height);
                break;
            }
        case sf::Event::MouseWheelMoved:
            {
                // When zooming in, center view on Mouse Cursor Position
                if (event.MouseWheel.Delta > 0)
                {
                    window->GetDefaultView ().SetCenter (window->ConvertCoords (window->GetInput ().GetMouseX (), window->GetInput ().GetMouseY ()));
                    window->SetCursorPosition (window->GetWidth () / 2, window->GetHeight () / 2);
                }
                window->GetDefaultView ().Zoom (event.MouseWheel.Delta < 0 ? 0.5f : 2.f);
                break;
            }

And get the following errors for it:

Code: [Select]

GUI.cc:79:87: error: passing ‘const sf::View’ as ‘this’ argument of ‘void sf::View::SetSize(float, float)’ discards qualifiers [-fpermissive]
GUI.cc:88:148: error: passing ‘const sf::View’ as ‘this’ argument of ‘void sf::View::SetCenter(const Vector2f&)’ discards qualifiers [-fpermissive]
GUI.cc:91:88: error: passing ‘const sf::View’ as ‘this’ argument of ‘void sf::View::Zoom(float)’ discards qualifiers [-fpermissive]

That did work in SFML1.6. I think the problem is, that RenderWindow::GetDefaultView () became const in SFML2.
Now i would like to know why and maybe a suggestion, how to archieve what i want.

[Laurent]

The change is more important than just adding const: views are now handled by copy rather than by reference. And you can't change the default view anymore.

[MickeyKnox]

But how do i react on ResizeEvents, or do a zoom then?
Do i have to create a new view everytime?

[OniLinkPlus]

But how do i react on ResizeEvents, or do a zoom then?
Do i have to create a new view everytime?

Unfortunately, yes.

[Laurent]

It just requires two more lines of code, it's not a big deal really.

Code: [Select]

case sf::Event::MouseWheelMoved:
{
    sf::View view = window->GetView();
    view.Zoom(...);
    window.SetView(view);
}

[Nexus]

An alternative is to keep the view stored and call sf::RenderWindow::SetView() before drawing. This is useful when you have multiple views, e.g. for different background/foreground layers. Then you can still change the view directly.

[MickeyKnox]

thanks, i stick with nexus' suggestion.