Add view event for better integration with other bundles

[vkartaviy]

For example I need integration with FOSRestBundle but I don't want to copy-paste all code from controller action to just change rendering logic...

What do you think about adding view event?

[ghost]

do we really need to have all those events? I'm not sure what would be better though :(

[vkartaviy]

Those events doesn't break compatibility and gives you ability to change responses if needed.

Without view events it's not possible to change rendering logic...

[kingcrunch]

I must say this many events makes me a little nervous too: Many events tightens the coupling between this and other bundles, that makes use of the events, again. Events should be used, where an actual event happens, but if everything would trigger an event, just because it renders something, access the persistence, or something like that, it can get quite confusing.

What is the actual use case? When you say "rendering logic", isn't this just about overriding the templates?

[ghost]

@vkartaviy : can you elaborate on what you want to change that can't be done by some refactoring to the controller code or overriding templates?

[XWB]

This is being added in other PR's.