Deprecate mouseEnter/Leave/Move Ember events

[simonihmig]

Rendered

[locks]

Minor changes :)

[rwjblue]

Thoughts on also adding mousemove to the list to be deprecated? I realize it doesn't have all of the same issues (since it bubbles), but it definitely has the same negative performance impact.

[rwjblue]

Thanks for putting this together @simonihmig!

[simonihmig]

Thoughts on also adding mousemove to the list to be deprecated?

Yes, I mentioned this under "Alternatives", and personally would be inclined to also include this!

Here's a profiler view when just moving the mouse over an Ember app:

The first two scripting executions (mouseout + mouseover) are for mouseenter/leave support, the third is just the normal event listener for mousemove. All these take just a fraction of a millisecond, though at large scale it looks like this: 😕

addressed

[rwjblue]

@simonihmig - Would you mind updating to include mouseover and mousemove? I'm adding this to an upcoming core team meeting to see about advancing...

[simonihmig]

Would you mind updating to include mouseover and mousemove?

@rwjblue updated this to include mousemove!

But mouseover is not supported anyway here. It was used for the mouseEnter implementation internally, but does not get dispatched itself, AFAICT.

[rwjblue]

Ah, sorry for the confusion thank you @simonihmig!

[rwjblue]

We discussed this a bit during a recent weekly call, and would love to see some tweaks to the examples.

[rwjblue]

Discussed this at today's team meeting, and are 👍 on moving this into final comment period.

[simonihmig]

Updated this to

• show deprecations at creation time rather than when dispatching
• refer to separate deprecation guides for Ember.Component vs. {{action}}
• include Component API docs for references to events that need to be removed

[pzuraq]

At today's core team meeting, we have decided to move forward with this RFC. 👍