objectActivated doesn't get called when object gets unselected

[yennor]

Describe the bug
ObjectActivated gets properly called when clicking on an object and it gets selected. But when clicking somewhere where no object is, it should also be called, just for example with null. Otherwise it is impossible for the application to know if there is really a selected object or not.

To Reproduce
Steps to reproduce the behavior:

1. Click on an object in the image
2. objectactivated gets called with that object
3. Click on an empty space in the image
4. object activated doesn't get called. The application still thinks the previous ovject is selected.

Expected behavior
ObjectActivated should always be called. Or otherwise there needs to be a callback when all objects are unselected.

[lja1018]

@yennor
The objectActivated event is an event that occurs when an unspecified object is activated.
It's hard to expect it to happen when it's deselected. Please refer to this link.

[yennor]

I expected it to send me a null reference, to inform me, that "nothing" has been activated. In general a notification when the activatedObject changes. Also when the activatedObject changes to none, that would be some kind of activation ;-).
My usecase for that is pretty simple.
In the user interface I've got, some buttons need to be deactivated, when no object is selected. Right now it seems to be impossible to find out, that no object is activated at all.
I could also imagine use case, where depending on what kind of object is activated, different user interface elements would be displayed.

[lja1018]

@yennor
How about using selectionClear to determine that there is no activated object?

[yennor]

you mean as a new event? Because if that one already exists, I really can't find it.

Yes that would also work :-). Maybe in the documentation for objectActivated mention the other event, so nobody would oversee it.

[lja1018]

@yennor
I will consider improving the event name. Thank you for the suggestion. :)

[yennor]

cool, thanks :-)