Intent to remove: support for old drag events

[Neil Deakin]

In bug 1162050, we'd like to remove support for the old non-standard
drag events, which were left in for a period of compatibility.

The 'draggesture' event should be replaced with the 'dragstart' event
(such as ondragstart)
The 'dragdrop' event should be replaced with the 'drop' event.

If you use these events, they are fired in the same manner as the
standard events, so it should be a simple matter of searching and
replacing the event names.

The non-standard dragexit event will remain as is, as it has no exact
standard equivalent.

Firefox does not use these events in its code. I filed bug 1171979 for
fixing this in Thunderbird and bug 1171980 for fixing this in Seamonkey.
If you use these events anywhere or you are the author of an add-on that
uses these events, you will need to update your code as described above.

The standard drag and drop API is described at:

https://html.spec.whatwg.org/multipage/interaction.html#dnd
https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Drag_and_drop

In addition, we would like to remove the long-deprecated
nsDragAndDrop.js script located in toolkit/content in favour of the
standard drag and drop API, described at the links above. To ease the
transition, if necessary, you may wish to include this script (
https://dxr.mozilla.org/mozilla-central/source/toolkit/content/nsDragAndDrop.js
) directly in your project.

Please respond if there are any concerns.

[smaug]

On 06/09/2015 05:17 PM, Neil Deakin wrote:
> In bug 1162050, we'd like to remove support for the old non-standard drag events, which were left in for a period of compatibility.
>

yes please. Anything we can do to simplify dnd code is good.



-Olli

[Ehsan Akhgari]

On 2015-06-09 10:17 AM, Neil Deakin wrote:
> In bug 1162050, we'd like to remove support for the old non-standard
> drag events, which were left in for a period of compatibility.

This is great!

As far as I know, these events have never been supported by another
browser engine. Is that correct? If so, hopefully not a lot of
websites would be affected by this these days.

[Jonas Sicking]

On Wed, Jun 10, 2015 at 12:35 PM, Ehsan Akhgari <ehsan....@gmail.com> wrote:
> On 2015-06-09 10:17 AM, Neil Deakin wrote:
>>
>> In bug 1162050, we'd like to remove support for the old non-standard
>> drag events, which were left in for a period of compatibility.
>
> This is great!

I agree it's great if we can remove this. But do we have any data that
this won't break websites? We do know that websites quite often use
browser-specific features, including Gecko specific ones.

/ Jonas

[Karl Dubost]

Jonas,

Le 10 juin 2015 à 13:44, Jonas Sicking <jo...@sicking.cc> a écrit :
> But do we have any data that this won't break websites?

nope. But at first sight, it doesn't seem used at all.
https://github.com/search?q=draggesture&type=Issues&utf8=%E2%9C%93

And most of the JS code is also quite unrelated or from books
https://github.com/search?l=javascript&q=draggesture&type=Code&utf8=%E2%9C%93


--
Karl Dubost, Mozilla
http://www.la-grange.net/karl/moz

[Chris Peterson]

On 6/9/15 10:21 PM, Karl Dubost wrote:
> Jonas,
>
> Le 10 juin 2015 à 13:44, Jonas Sicking <jo...@sicking.cc> a écrit :
>> But do we have any data that this won't break websites?
>
> nope. But at first sight, it doesn't seem used at all.
> https://github.com/search?q=draggesture&type=Issues&utf8=%E2%9C%93
>
> And most of the JS code is also quite unrelated or from books
> https://github.com/search?l=javascript&q=draggesture&type=Code&utf8=%E2%9C%93

It looks like some addons will be affected:

https://mxr.mozilla.org/addons/search?string=draggesture%22&tree=addons&case=1

https://mxr.mozilla.org/addons/search?string=dragdrop%22&tree=addons&case=1