allow to edit file meta information directly in image gallery and other elements

[Serhii-DV]

While in Contao 3 all selected images are showing before "Change selection" button we can add edit buttons here for editing meta information without going to File Manager.

[leofeyer]

I have tried it but it interfered with the drag&drop functionality. I don't know if there is a way to have both, therefore I'll leave the ticket open for some discussion.

[Toflar]

Maybe @may17 as mootools specialist might consider doing a pull request? :)

[may17]

@leofeyer how did you plan the editing of the images meta data? Is there any existing code to analyse?

I think the easiest way would be to open each element in the modalbox.

[leo-unglaub]

If the meta informations are stored in a real dca like in #4327 proposed this would be very easy. You could use the dcalinking extension from @toflar

[nrunde]

+1

[xchs]

+1

[Samson1964]

+1

[JohannesFerner]

+1 also take a look at this one: #5910

[Ruudt]

I am missing a part from #5673 here. The issue there was that images are not floated next to one another. I'm not sure what changes are going to be made, but currently the images don't float left for custom fields when their object type is not in the list of gallery types.

Please add a switch to fields eval so we can enable the sgallery classname (for floating the images) on a field level as well.

ex: 'eval' => array('gallery'=>true),