Add swipe functionality for touch sensitive screens.

[Graham-72]

It would be good to add the jQuery plugin TouchSwipe so that users with touch sensitive screens can swipe through a sequence of photos.

A method is described at jackmoore/colorbox#395.

D7 has an issue at https://www.drupal.org/node/1532326 but this was closed 4 years ago because 'doesn't seem to affect a lot of users' - perhaps true then but not now.

There is also the D7 project 'Colorbox Swipe Gestures Support' at https://www.drupal.org/project/colorbox_swipe.

[jenlampton]

Do we already have this jQuery plugin in core? Maybe I'm thinking of something else we added with admin bar... Yes, either way. This would be a valuable addition!

[Graham-72]

I have now ported the colorbox_swipe module to backdrop https://github.com/backdrop-contrib/colorbox_swipe and this uses two additional jQuery libraries, jQuery.event.swipe and jQuery.event.move, but when used in this module a swipe merely causes the image to change, it does not slide the image left or right.

The views_slideshow_galleria module (already ported to Backdrop https://github.com/backdrop-contrib/views_slideshow_galleria) uses the Galleria library which includes swipe functionality and produces a gallery that does slide images left or right which is perhaps better.