IBeginDragHandler not called without EventTrigger component

I have a UIBehaviour that implements the interfaces IBeginDragHandler and IDropHandler. When I drag the object OnBeginDrag is not getting called whereas the OnDrop does. When I attach an EventTrigger component (with no triggers set up in the inspector) to the object it starts working as expected.

Has the default behaviour changed in one of the last patches? I remember having done that before without attaching an EventTrigger component.

 

I have no idea if it has changed, but I get the same behavior.

 

That is odd but I just tested with a script yesterday in 4.6.1 and 4.6.3 with no issue.

Try using the UIWindowBase control in the Unity UI Extensions bitbucket repo, tested that one again and it works fine (Without EventTrigger)
https://bitbucket.org/ddreaper/unity-ui-extensions

 

Seems IBeginDragHandler.OnBeginDrag is not called unless IDragHandler is also implemented.
Adding an EventTrigger implements all the interfaces, so I guess that why it works.

 

Interface segregation principle.